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52results about How to "Realize constant current control" patented technology
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Non-contact power supply primary circuit with current expanding function
ActiveCN103390938ASmall working currentImplement soft switchingElectromagnetic wave systemCircuit arrangementsCapacitanceResonance
The invention relates to a non-contact power supply primary circuit with a current expanding function. The non-contact power supply primary circuit comprises an inverter and a primary coil, wherein a primary compensating circuit is connected between the inverter and the primary coil. The primary compensating circuit comprises a first inductor, a first capacitor and a second inductor, wherein one end of the first inductor is connected with the output anode end of the inverter, the other end of the first inductor is connected with one end of the first capacitor and a first end of the second inductor, a second end of the second inductor is connected with one end of the compensating circuit through the primary coil, and the other end of the compensating circuit is connected with the other end of the first capacitor and the output cathode end of the inverter. The compensating circuit compensates inductance in the primary coil, and a resonance circuit is formed between the compensating circuit and the primary coil to enable the first inductor, the first capacitor and the second inductor to form the circuit with the current expanding function. The non-contact power supply primary circuit with the current expanding function can achieve constant control of currents of primary cables, has the current expanding function and is wide in application range and safe and reliable.
Owner:MIRACLE AUTOMATION ENG CO LTD
Back light source drive circuit and television
ActiveCN102222490AStrong loadConducive to loadTelevision system detailsStatic indicating devicesEngineeringFeedback circuits
The invention discloses a back light source drive circuit directly driving a lamp strip circuit by using a primary half-bridge resonance circuit. The back light source drive circuit comprises a primary resonance circuit, a secondary lamp strip circuit and an optical isolating feedback circuit having an optical coupling feedback function, wherein the primary resonance circuit generates a driving pulse signal according to the received external voltage and a current signal fed back by the optical isolating feedback circuit, and provides needed work voltage for the secondary lamp strip circuit according to the driving pulse signal; and the optical isolating feedback circuit samples the loaded current in the secondary lamp strip circuit in real time, and feeds back the current signal to the primary resonance circuit. The back light source drive circuit directly lightens and controls the back light source by using the primary half-bridge resonance circuit; and optical coupling is used as the feedback control from the secondary level to the primary level. The drive circuit is simplified so as to eliminate a secondary side LED driving chip, and reduce device number of the whole system.
Owner:HISENSE VISUAL TECH CO LTD
Backlight drive circuit and television
ActiveCN103476176ARealize constant current controlAchieving Current Balance AdjustmentElectric light circuit arrangementCurrent thresholdEngineering
The invention provides a backlight drive circuit which comprises a backlight power supply circuit, a current sampling circuit, a switching circuit and a constant-current control circuit. The backlight power supply circuit provides voltages needed in working to backlight loads according to received pulse drive signals. The current sampling circuit is used for carrying out sampling on the working currents of the backlight loads. The switching circuit is arranged on negative side lines of the backlight loads, and is used for controlling the switching on or off of the negative side lines of the backlight loads. The constant-current control circuit is connected to the current sampling circuit and the switching circuit, and is used for controlling the duty ratio of the switching circuit in a conducting state according to the intensity of the working currents of the backlight loads collected by the current sampling circuit, so that the numerical value of the average working current of the backlight loads is made to be equal to a preset current threshold. The invention further provides a television. Through the technical scheme, the constant-current control over the backlight loads can be achieved.
Owner:GUANGDONG HISENSE ELECTRONICS CO LTD
LED (Light Emitting Diode) constant-current driving circuit
InactiveCN102685984AImprove stabilityRealize constant current controlElectric light circuit arrangementVoltage referencePeak value
The invention discloses an LED (Light Emitting Diode) constant-current driving circuit. The LED constant-current driving circuit comprises a voltage reference unit which is used for generating the reference voltage, a peak current detection keeping unit, an error amplifier unit, a current comparator unit, a demagnetization detection unit and a self-adaptive unit. According to the LED constant-current driving circuit disclosed by the invention, the LED constant-current control can be realized, the service life of an LED can be prolonged, the problem of CTR (Current Transmission Rate) attenuation of an optical coupler is overcome as the circuit is free from an optical coupler device, the stability of the circuit is increased, the EMI (Electro Magnetic Interference) and the harmonic distortion can be greatly improved as the switching frequency of a power switching tube of the circuit is a variable frequency, an external circuit can be greatly simplified by adopting the circuit, and the using cost can be greatly reduced.
Owner:SUZHOU POWERLINK MICROELECTRONICS
LED driving circuit applicable to silicon controlled rectifier light modulator, and control circuit thereof
ActiveCN105142260AAchieve single-stage dimmingLow costElectric light circuit arrangementSilicon-controlled rectifierAverage current
The invention provides an LED driving circuit applicable to a silicon controlled rectifier light modulator, and a control circuit thereof. The control circuit comprises a light modulation phase detection circuit, a phase filtering circuit connected with the light modulation phase detection circuit, a non-linear reference circuit connected with the phase filtering circuit, a zero cross detection circuit in direct or indirect coupling with an output end of the LED driving circuit, an output current simulation circuit connected with the zero cross detection circuit, an average current ring adjusting circuit connected with the non-linear reference circuit and the output current simulation circuit, a reset circuit connected with the average current ring adjusting circuit, an interrupted time-delay circuit connected with the phase filtering circuit, and a main driving circuit connected with the reset circuit, the interrupted time-delay circuit and the zero cross detection circuit. The control circuit can realize high power factor single-stage light modulation and has advantages of no scintillation and good compatibility.
Owner:HANGZHOU SILAN MICROELECTRONICS
Single-level LED driving power supply
InactiveCN103874295AImprove work performanceEasy to useConversion without intermediate conversion to dcElectric light circuit arrangementDriving currentVoltage spike
The invention discloses a single-level LED driving power supply which comprises an AC input end, a rectifier circuit, a single-level PFC circuit, a switching element and a feedback control circuit. The AC input end is used for inputting the alternating current supply voltage. The rectifier circuit is connected with the AC input end and used for converting an input full-wave alternating current voltage into a semi-wave alternating current voltage. The single-level PFC circuit is connected with the rectifier circuit and used for rectifying and filtering the semi-wave alternating current voltage output by the rectifying circuit and generating driving currents for driving an LED. The switching element is connected with the single-level PFC circuit and controls on-off of the circuit. The feedback control circuit is connected with the switching element and the single-level PFC circuit and used for feeding back, controlling and adjusting the driving currents and keeping the driving currents constant. The single-level LED driving power supply is simple in structure, low in cost, small in size, capable of feeding leakage inductance energy of a transformer back to the current input end and improving the working efficiency of a convertor and capable of avoiding voltage spike across the two ends when a switching tube is turned off without adding an extra circuit.
Owner:珠海铂能电子科技有限公司
Pilot arc chopped wave control circuit and cutting machine
ActiveCN102794547AAvoid main transformer biasRealize constant current controlArc welding apparatusTransformerPower grid
The invention provides a pilot arc chopped wave control circuit and a cutting machine. The pilot arc chopped wave control circuit comprises a power switch device drive circuit for generating a pulse width modulation drive signal under low power grid input condition and limiting the current of a power switch tube, a differential amplification sampling circuit for sampling and amplifying the current under low power grid input condition, a current feedback loop control circuit for regulating the pulse width of the pulse width modulation drive signal according to the amplified current signal, and a pilot arc current reflowing circuit for reflowing the current to a main loop for transmission to a spraying nozzle of the cutting machine when the power switch tube is closed and the output negative terminal is positive, wherein the power switch device drive circuit, the differential amplification sampling circuit, the current feedback loop control circuit and the pilot arc current reflowing circuit are conductively connected in sequence. Ultramicrocrystal main transformer bias and pilot arc overcurrent protection are avoided, the success rate of arc starting is increased, the pilot arc current is stable, the arc cannot be broken, the small-current constant-current control is achieved, and the problems of arc starting and arc breaking under low power grid voltage input condition are solved; and meanwhile, the loss of the pilot arc and the pilot arc of the spraying nozzle is reduced, and the control circuit is long in service life, durable and reliable.
Owner:SHENZHEN RILAND IND
Driving control system with multiple LED (light emitting diode) loads for automobile
ActiveCN102612232AImprove stabilityReduced feedback timeElectric light circuit arrangementEngineeringControl switch
The invention provides a driving control system with multiple LED (light emitting diode) loads for an automobile. The driving control system comprises a first power supply unit, a second power supply unit and a control unit, wherein the first power supply unit and the second power supply unit are both provided with a sampling unit and are used for providing load voltages to respective load based on the switching conditions of the respective controlled switch unit; and the control unit is used for outputting a balance signal for controlling a constant unit in the first power supply unit and a switch control signal for regulating and controlling the switching frequency of each controlled switch unit based on the sampling result of each sampling unit, wherein the constant unit is used for converting the direct current voltage output by the first power supply unit into a corresponding load voltage and regulating the corresponding load voltage based on the balance signal, so that the power supplied for each load is kept constant, and the sampling units are used for collecting the voltage signal of each controlled switch unit and the power supply signal of each load. According to the system, the voltage of each load can be kept stable.
Owner:SHANGHAI SEEYAO ELECTRONICS CO LTD
Constant-current control circuit, switching regulator, integrated circuit and constant-current control method
InactiveCN103840664AReduce complexityReduce in quantityDc-dc conversionElectric variable regulationSwitched currentControl signal
The invention discloses a constant-current control circuit, a switching regulator, an integrated circuit and a constant-current control method. The constant-current control circuit is applied to the switching regulator. The switching regulator comprises an upper power switch and a lower power switch. The constant-current control circuit comprises a switching current sampling circuit, a compensating signal generation circuit and a switch control signal generation circuit, wherein the switching current sampling circuit is used for sampling currents flowing through the upper power switch and / or the lower power switch and outputting switching current sampling signals; the compensating signal generation circuit is used for generating compensating signals according to the duty ratio of the switching current sampling signals to switch control signals or multiple switching current sampling signals; the switch control signal generation circuit is used for generating the switch control signals according to the compensating signals. By means of the scheme, the complexity of an external circuit of the switching regulator can be lowered, the number of devices can be reduced, and the number of input ports of the control circuit is reduced at the same time.
Owner:NANJING SILERGY SEMICON TECH CO LTD
Induction type wireless power supply system double-closed-loop constant output current control method
ActiveCN104767290AEliminates input voltage variationsInput voltage variation achievedElectromagnetic wave systemCircuit arrangementsLoop controlClosed loop
Provided is an induction type wireless power supply system double-closed-loop constant output current control method. The method comprises outer-loop controlling and inner-loop controlling. The outer-loop controlling comprises the steps that based on a short time fourier transformation method, real-time processing is carried out on output voltage and output current signals of a primary side high-frequency inverter, an equivalent impedance of a resonance circuit is calculated, it is judged whether an impedance phase-angle is in a threshold value range or not, if the impedance phase-angle exceeds a threshold value, an automatic frequency adjusting module is started, calculation is repeated, and the equivalent impedance of the primary side resonance circuit is judged until a system works in a resonance state. The inner-loop control comprises the steps that an input voltage theoretical value of the high-frequency inverter is calculated and corrected, and is used as an input voltage reference value of the inner-loop controlling. According to deviation of the input voltage reference value and a measuring value (actual input voltage of the high-frequency inverter), real-time calculation is carried out, a duty ratio of a switch signal of the deviation is removed, and a corresponding switch pulse signal is output. According to double-closed-loop constant output current controlling, energy output of an induction type wireless power supply system can be effectively controlled, and the wireless electric energy transmission quality is improved.
Owner:SOUTHWEST JIAOTONG UNIV +1
Compensation circuit for stabilizing output current of phase shift resonance soft switching inverter
ActiveCN102136808AImprove output constant current characteristicsRealize constant current controlEfficient power electronics conversionDc-ac conversion without reversalPower inverterPhase shifted
The invention relates to a compensation circuit for stabilizing the output current of a phase shift resonance soft switching inverter. In the scheme, a Hall sensor or current diverter is eliminated, the control circuit is simplified, the interference introduced by the traditional sampling circuit is eliminated, the system response time is reduced, and the output constant-current characteristic ofthe inverter is improved. The compensation circuit mainly comprises a leading leg pulse generating and regulating circuit, the pulse output terminal of the leading leg pulse generating and regulatingcircuit is respectively connected with a driving pulse sampling circuit, a lagging leg pulse generating and regulating circuit and an amplifying and isolating circuit, the driving pulse sampling circuit is connected with a compensating circuit, the compensating circuit is connected with a current given filtering circuit, and the compensating circuit is connected with an input current given signalVg; and the current given filtering circuit is respectively connected with the leading leg pulse generating and regulating circuit and the lagging leg pulse generating and regulating circuit, and thelagging leg pulse generating and regulating circuit is also respectively connected with the driving pulse sampling circuit, the current given filtering circuit and the amplifying and isolating circuit.
Owner:JINING AOTAI ELECTRICAL
LED driver and LED lighting device
InactiveCN104507241ASimple structureLow costElectrical apparatusElectroluminescent light sourcesDc currentAverage current
Owner:SILERGY SEMICON TECH (HANGZHOU) CO LTD
High power factor non-electrolytic capacitance LED driving power supply and control method thereof
InactiveCN109688669AReduce usageRealize constant current controlElectrical apparatusElectroluminescent light sourcesCapacitanceElectrolytic capacitor
The invention relates to a high power factor non-electrolytic capacitance LED driving power supply and a control method thereof. The high power factor non-electrolytic capacitance LED driving power supply comprises a rectifier circuit, a two-circuit interleaved parallel-connected Boost circuit, an auxiliary circuit and an LED load; the two-circuit interleaved parallel-connected Boost circuit worksin a current discontinuous mode to realize a power factor correction function and constant current control; the auxiliary circuit is used for balancing the difference between the alternating currentinput instantaneous power and the direct current output instantaneous power, then use of large capacity electrolytic capacitance is avoided, film capacitance can be used instead of the electrolytic capacitance, and the non-electrolytic capacitance LED driving power supply is realized; and through coordination control of the interleaved parallel-connected Boost circuit and the auxiliary circuit, low ripple output and constant current control of the LED load can be realized.
Owner:FUZHOU UNIV
LED constant-current drive power source
InactiveCN106658869ASimple structureImprove work efficiencyElectrical apparatusElectroluminescent light sourcesElectromagnetic interferenceEngineering
The invention discloses an LED constant-current drive power source, comprising a lightning-proof circuit, an EMI (electromagnetic interference) unit for removing high-frequency clutter and interfering signal , a rectifying unit, a voltage conversion unit, a filter unit, an output unit, a sampling unit and a PWM (pulse width modulation) control unit that are electrically connected in sequence; the sampling unit is used for collecting voltage and current signals of the output unit in real time and transmitting to the PWM control unit, and the PWM control unit outputs PWM wave of corresponding duty ratio to the voltage conversion unit according to the voltage and current signals so as to adjust working current of the output unit. The LED constant-current drive power source is simple and reasonable in structure, allows effectively improved working efficiency and reduced cost, has high stability, and can provide good constant-current control.
Owner:温朋亮
Constant current control device, method and system for electromagnetic valve
ActiveCN111664287ARealize constant current controlLow costOperating means/releasing devices for valvesElectric variable regulationControl signalOriginal data
The invention provides a constant current control device, method and system for electromagnetic valve. The device comprises a control chip, a driving module, a current sampling module and a current conversion module, wherein the control chip is an original data processing chip of equipment of a to-be-controlled electromagnetic valve, and the current sampling module and the current conversion module are used for representing a digital current signal of an actual current value passing through the to-be-controlled electromagnetic valve and transmitting the digital current signal to the control chip; the control chip is used for generating a corresponding target PWM control signal according to a preset target current value and the digital current signal, generating a driving signal according to the target PWM control signal and transmitting the driving signal to the driving module; and the driving module is used for transmitting a current with the corresponding output current value to theto-be-controlled electromagnetic valve according to the driving signal from the control chip, wherein a difference value between the output current value and the target current value is within a preset target current error range. According to the scheme, the cost for constant current control of the electromagnetic valve can be lowered.
Owner:SICHUAN HONGMEI INTELLIGENT TECH CO LTD
Compensation circuit for implementing contravariant welding machine electric power outputting current steadily
ActiveCN101234448AImprove output constant current characteristicsRealize constant current controlArc welding apparatusPower flowEngineering
The invention discloses a compensating chain realizing a stable current output of a power supply of an inverter welder, which includes a pulse width modulator U1, wherein a pulse output terminal of the pulse width modulator U1 is connected with a drive pulse filter circuit; the drive pulse filter circuit is connected with the compensating chain; the compensating chain is connected with a current given filter circuit; the current given filter circuit is connected with an incoming current given signal Vg; meanwhile, the compensating chain is connected with a controlling end of the pulse width modulator U1. The compensating chain realizing a stable current output of a power supply of an inverter welder is characterized in that a Hall sensor or a shunt is saved; a controlling circuit is simplified; interruptions caused by a traditional sample circuit are eliminated; system responding time is accelerated; power supply output constant current characteristic is improved.
Owner:AOTAI ELECTRIC
Current control circuit and control method thereof
ActiveCN109842301ASmooth current changeCurrent Spike NoDc-dc conversionElectric variable regulationSignal onHemt circuits
The invention discloses a current control circuit, which acquires current information on the output side of a bidirectional converter by means of a current sampling circuit, uses the outputs of a first voltage regulating circuit and a second voltage regulating circuit as the input of an error amplifier, regards the output of the error amplifier as the input of an optocoupler feedback circuit, feeds back a current signal on the output side into a PWM circuit through conversion processing by means of various levels of circuits, controls a duty ratio of a switching tube on the input side of a main power circuit by means of a control circuit, and realizes constant current of on the output side. The current control circuit can ensure that the bidirectional converter has no current oscillation and current spike when the bidirectional converter switches an operating direction, can realize the constant current on the output side of the bidirectional converter when only using one forward bandgap voltage reference source, and is simple in circuit.
Owner:MORNSUN GUANGZHOU SCI & TECH
Narrow-pulse high-current constant-current source and control method thereof
PendingCN112486232ALow calorific valueRealize constant current controlElectric variable regulationIndividual semiconductor device testingMOSFETHemt circuits
The invention relates to the technical field of semiconductor detection equipment, in particular to a narrow-pulse high-current constant-current source and a control method thereof. A logic controllerFPGA is arranged to drive NMOS of a short-circuit branch through push-pull driving to improve the slope of pulse rising and falling edges, an SPI interface is connected with a digital-to-analog converter DA to control the output voltage, a current signal is output through operational amplifiers of a mirror current source, an MOSFET driver is controlled through multiple IO ports to connect or disconnect the short-circuit branch, meanwhile, the short-circuit branch is provided with a clamping circuit in a matched manner, so that the impact on the mirror current source is reduced, the overshootof narrow pulses is reduced, and finally, the current is output to a tested component through multi-path parallel connection. According to the invention, the load current is dispersed to more components through parallel branches, so that the heating value of an MOSFET can be effectively reduced; and by arranging the short-circuit branch, the limitation of the slew rates of the operational amplifiers on the narrow pulse transition process is eliminated, and by arranging multiple paths of parallel circuits and a clamping circuit, narrow pulse large-current constant-current control of an approximate ideal waveform is realized.
Owner:北京麦特达电子技术开发有限公司
A BUCK type DCDC output constant current detection control circuit and method
ActiveCN109039070ASimple structureHigh precisionDc-dc conversionElectric variable regulationCapacitanceCharge injection
The invention relates to the technical field of constant current detection and control, in particular to a BUCK type DCDC output constant current detection and control circuit and method, comprising an input voltage compensation network, an output voltage dividing network, an input current sampling network, a loop control circuit and a step-down type circuit. The input voltage compensation networkis connected with an output voltage dividing network, the output voltage dividing network and the input current sampling network are connected with a loop control circuit, the step-down type circuitis connected with an input current sampling network and a loop control circuit, As that input current is detect and the input voltage compensation network is introduced at the same time, the output constant current control is realized, the input voltage and the output voltage are compensated, the influence of the offset factors such as the inductance value, the sample-and-hold, the capacitance, the charge injection and the buffered operational amplifier and the like is not exist, the structure is simple, additional control logic and the sample-and-hold circuit are not provided, and the precision is high.
Owner:GUANGDONG DESAY CORP
Quasi-single-stage high power factor circuit and device with primary side constant current control
ActiveCN103269164BSimple structureCost advantageEfficient power electronics conversionApparatus with intermediate ac conversionCapacitanceTransformer
The invention provides a primary side constant current controlled quasi single-stage high power factor circuit and device. The circuit comprises a rectifier bridge, an input capacitor, an inductor, a bus capacitor, a first diode, a switching tube, a second diode, a sampling resistor and a transformer, wherein the first end of the inductor is connected with the first end of the input capacitor, and the first end of the bus capacitor is connected with the second end of the inductor; the anode of the first diode is connected with the second end of the bus capacitor, and the cathode of the first diode is connected with the negative output end of the rectifier bridge; the first power end of the switching tube is connected with the second end of the inductor, and the control end of the switching tube receives the external driving signals; the anode of the second diode is connected with the second power end of the switching tube, and the cathode of the second diode is connected with the negative output end of the rectifier bridge; the first end of the sampling resistor is connected with the second power end of the switching tube, and the dotted terminal of the primary side winding of the transformer is connected with the second end of the sampling resistor; and the non-dotted terminal of the primary side winding of the transformer is connected with the second end of the bus capacitor, and the transformer is coupled with a load. The circuit provided by the invention has the advantage of lower cost compared with the traditional two-stage circuit, and has the advantage of reduction in ripple current of the load compared with the traditional single-stage circuit.
Owner:HANGZHOU SILAN MICROELECTRONICS
Self constant current LED lamp filament
PendingCN107654853ARealize constant current controlSimplify the assembly processElectrical apparatusElectric circuit arrangementsPower flowLuminous flux
The invention provides a self constant current LED lamp filament. The self constant current LED lamp filament comprises a heat conduction substrate, a plurality of LED lamps fixed to the first surfaceof the heat conduction substrate, two-end constant current control chips and a high radiation material layer formed on the second surface of the heat conduction substrate, and the LED lamps and the two-end constant current control chips are connected in series. According to the self constant current LED lamp filament, the single two-end constant current control chips and LED chips are clustered and placed on the substrate with the radiating function in a series manner, and therefore a self constant current lamp-filament-shaped LED integration light source is formed; the light source rated load voltage and the working current are preset and fixed, and under the condition that the input voltage is larger than the working voltage, the luminous flux within unit time is fixed; an LED lamp bulb capable of meeting different load requirements can be formed through series connection or parallel connection, the requirement for power source input is simplified into rectification and voltage regulating, and work can be done under the condition that current is directly input; and the lamp bulb assembling process can be greatly simplified, a traditional incandescent lamp automatic productionline is directly adopted, and the production cost is reduced.
Owner:SHANGHAI LATRONIX TECH CORP
Direct-current solid-state circuit breaker
ActiveCN111211541AStable current valueRealize constant current controlEmergency protective circuit arrangementsCapacitanceHemt circuits
The invention provides a direct-current solid-state circuit breaker. The direct-current solid-state circuit breaker comprises a switching circuit, a freewheeling inductor and a freewheeling capacitor;the switching circuit comprises an IGBT, two first switching diodes and two second switching diodes; one end of the freewheeling inductor is connected with the first end of the switching circuit; theother end of the freewheeling inductor is connected to the anode of the direct-current bus end of the direct-current solid-state circuit breaker; one end of the freewheeling capacitor is connected tothe anode of the direct-current bus end; the other end of the freewheeling capacitor is connected to the cathode of the direct-current bus end and the cathode of an energy source end. Therefore, a freewheeling circuit can maintain an approximately stable current value at the direct-current bus end, and realizes the constant current control of the direct-current bus end; and the controller can monitor the state of a direct-current circuit where the direct-current bus is located according to the current and / or voltage of the direct-current bus end, determine whether the direct-current circuit where the direct-current bus is located is in a fault state all the time, and determine whether to control an IGBT to be in an off state all the time so as to achieve a selective protection function.
Owner:中国船舶集团有限公司第七一一研究所
Buck-boost constant current circuit and output current sampling method thereof
InactiveCN106413172AQuick responseSimple designElectrical apparatusElectroluminescent light sourcesClosed loopEngineering
The present invention discloses a buck-boost constant current circuit and an output current sampling method thereof. The circuit comprises a constant current control IC, the VDD pin of the constant current control IC is connected with a voltage input end VIN, the VSS pin of the constant current control IC is connected with a chip ground, the DRV pin of the constant current control IC is an output end to control the connection and disconnection of the S1, the output load is connected in parallel with the C1, the output load, the L1, the D1 and the R1 are connected in series to form a closed loop, and the R1 is connected between the VCS of the constant current control IC and the VDD pin or between the VCS pin and the VSS pin. The buck-boost constant current circuit can realize the system constant current control in the condition that the input voltage is very wide.
Owner:SHENZHEN OCX SEMICON CO LTD +1
PWM pulse width type constant current charging type capacitor energy storage welding charging control system
ActiveCN107707003ADemagnetizationImprove welding qualityElectric powerBattery load switchingCapacitanceTransformer
The invention relates to the technical field of a welding machine, particularly a PWM pulse width type constant current charging type capacitor energy storage welding charging control system. The charging control system comprises a three-phase charging transformer, a single-phase charging transformer, a rectifying circuit, a DC-LINK filtering circuit, a PWM charging control part, a charging current detection part, a welding transformer, a discharging circuit, a discharging switch-off circuit, a discharging current detection part, a discharging control part and a capacitor bank; no matter the input power supply is in single phase or three phases, the input power supply can be controlled by the same controller; by adoption of the PWM pulse width modulation mode the precision can be improvedby 10 times or more (counted by 1,000HZ) compared with an SCR adjustment mode; by adoption of a hall current sensor, the charging current can be sampled in real time, and then the PWM pulse width is adjusted, thereby realizing constant current control; and charging and discharging are both realized by adopting the welding transformer, and the charging current direction and the discharging currentdirection are opposite, so that magnetization of the transformer can be prevented effectively.
Owner:广州双穗电气设备有限公司
LED drive circuit and its control circuit suitable for thyristor dimmer
ActiveCN105142260BAchieve single-stage dimmingLow costElectric light circuit arrangementPower factorAverage current
The invention provides an LED drive circuit and its control circuit suitable for silicon controlled rectifier dimmers. The control circuit includes: a dimming phase detection circuit; a phase filter circuit connected with the dimming phase detection circuit; A connected nonlinear reference circuit; a zero-crossing detection circuit coupled directly or indirectly to the output of the LED drive circuit; an output current analog circuit connected to the zero-crossing detection circuit; an average circuit connected to the nonlinear reference circuit and the output current analog circuit A current loop adjustment circuit; a reset circuit connected with the average current loop adjustment circuit; an intermittent delay circuit connected with the phase filter circuit; a main drive circuit connected with the reset circuit, the intermittent delay circuit and the zero-crossing detection circuit. The invention can realize high power factor single-stage dimming, and has the characteristics of no flicker, good compatibility and the like.
Owner:HANGZHOU SILAN MICROELECTRONICS
A kind of ultraviolet lamp power supply
ActiveCN105682323BRealize constant current controlSimple structureElectrical apparatusElectric light circuit arrangementCapacitanceEngineering
The invention relates to the technical field of a power supply, and specifically to an ultraviolet lamp power supply. The ultraviolet lamp power supply is simple in circuit structure, and capable of flexibly adjusting pulse output frequencies and charging voltages in single times, and the power of the power supply is easy to increase. The ultraviolet lamp power supply comprises a main circuit, a starting circuit, a control circuit and a detection circuit, wherein the main circuit comprises a main voltage input voltage and a capacitance charge-discharge unit; the starting circuit comprises a starting voltage input unit, a starting unit, a PWM controller and a pulse xenon lamp; the detection circuit comprises a current detection unit and a voltage detection unit; the control unit comprises an MCU unit; the main circuit, the starting circuit and the detection circuit are all connected with the MCU unit; the main voltage input unit charges a main capacitor to supply a discharge voltage; the starting voltage input unit supplies the starting voltage to the starting circuit so as to control the starting of the pulse xenon lamp, and supplies pre-ignition current through the PWM controller so as to realize a pre-ionization state of the pulse xenon lamp; the voltage detection unit detects the voltage of the main capacitor; and the current detection unit detects the current of the pulse xenon lamp.
Owner:WUXI BRIGHTSKY ELECTRONICS
Resistance torque real-time adjusting method, system and equipment and readable storage medium
PendingCN114259689AReal-time precise control of resistance torqueReal-time monitoring of real-time speedAsynchronous induction clutches/brakesMuscle exercising devicesControl engineeringControl theory
The invention provides a resistance torque real-time adjusting method. The method comprises a test link and an application link. In the test link, the control module obtains, establishes and stores a corresponding relation table of the rotating speed, the current and the torque; in the application link, the control module receives a target torque instruction, and the target torque instruction comprises a target resistance torque; monitoring the real-time rotating speed of the resistance wheel; according to the corresponding relation table, the target torque instruction and the real-time rotating speed, a regulation and control current is calculated; regulation and control current is input into the electromagnet, and real-time adjustment of resistance torque is achieved. And when the rotating speed of the resistance wheel changes, the control module can recalculate the regulation and control current to keep the target resistance torque constant. Therefore, the resistance torque can be accurately adjusted in real time, the method is suitable for various electromagnetic control resistance wheel products, each electromagnetic control resistance wheel product has an independent product characteristic table (a corresponding relation table of rotating speed, current and torque), and the resistance torque does not need to be adjusted by adopting average data of a plurality of electromagnetic control resistance wheel products.
Owner:厦门立隽机电有限公司
Driving circuit based on flyback conversion power supply
InactiveCN106155166AReduce the impactGuaranteed stabilityElectric variable regulationHeat conductingClosed loop
The invention relates to the technical field of LED drivers, in particular to a driving circuit based on a flyback conversion power supply. The technical problem that a driving circuit in the prior art is greatly influenced by temperature variation is solved. The driving circuit mainly comprises an LED set circuit, an error amplifying circuit, a supply voltage control circuit, a reference voltage source and a closed loop connection circuit. The LED set circuit comprises an LED lamp bead assembly and a heat conducting rod, the LED lamp bead assembly is installed on the outer wall of the heat conducting rod, and heat conductors are installed at one or two ends of the heat conducting rod.
Owner:成都元始信息科技有限公司
Driving control system with multiple LED (light emitting diode) loads for automobile
ActiveCN102612232BRealize constant current controlImprove stabilityElectric light circuit arrangementControl signalControl system
The invention provides a driving control system with multiple LED (light emitting diode) loads for an automobile. The driving control system comprises a first power supply unit, a second power supply unit and a control unit, wherein the first power supply unit and the second power supply unit are both provided with a sampling unit and are used for providing load voltages to respective load based on the switching conditions of the respective controlled switch unit; and the control unit is used for outputting a balance signal for controlling a constant unit in the first power supply unit and a switch control signal for regulating and controlling the switching frequency of each controlled switch unit based on the sampling result of each sampling unit, wherein the constant unit is used for converting the direct current voltage output by the first power supply unit into a corresponding load voltage and regulating the corresponding load voltage based on the balance signal, so that the power supplied for each load is kept constant, and the sampling units are used for collecting the voltage signal of each controlled switch unit and the power supply signal of each load. According to the system, the voltage of each load can be kept stable.
Owner:SHANGHAI SEEYAO ELECTRONICS CO LTD
A dimensional arc chopper control circuit and cutting machine
ActiveCN102794547BAvoid main transformer biasRealize constant current controlArc welding apparatusTransformerSpray nozzle
Owner:SHENZHEN RILAND IND
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