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45 results about "CCM mode" patented technology
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CCM mode (Counter with CBC-MAC) is a mode of operation for cryptographic block ciphers. It is an authenticated encryption algorithm designed to provide both authentication and confidentiality. CCM mode is only defined for block ciphers with a block length of 128 bits.
Controller in a voltage mode buck converter for implementing a mode-switch function and an over-current protection by a multifunction pin and method thereof
ActiveUS7098632B2Reduced pin countReduce in quantityEmergency protective circuit arrangementsDc-dc conversionControl signalBuck converter
In a voltage mode buck converter having a pair of switches connected in series by a phase node to be switched by a pair of drive signals generated from a first control signal, a phase resistor is connected between a multifunction pin and the phase node, and a controller generates a second control signal and a third control signal from the second drive signal to sense the voltage on the multifunction pin respectively to generate an over-current signal and a CCM mode switch signal to switch the converter between a CCM mode and a DCM mode.
Owner:ANPEC ELECTRONICS CORPORATION
Controller in a voltage mode buck converter for implementing a mode-switch function and an over-current protection by a multifunction pin and method thereof
ActiveUS20050258808A1Reduced pin countReduce in quantityEmergency protective circuit arrangementsDc-dc conversionControl signalBuck converter
In a voltage mode buck converter having a pair of switches connected in series by a phase node to be switched by a pair of drive signals generated from a first control signal, a phase resistor is connected between a multifunction pin and the phase node, and a controller generates a second control signal and a third control signal from the second drive signal to sense the voltage on the multifunction pin respectively to generate an over-current signal and a CCM mode switch signal to switch the converter between a CCM mode and a DCM mode.
Owner:ANPEC ELECTRONICS CORPORATION
Totem-pole bridgeless power factor correction circuit
InactiveCN102130580AWon't breakShort reverse recovery timeEfficient power electronics conversionEnergy industryPower flowBusbar
The invention discloses a totem-pole bridgeless power factor correction circuit which comprises a switching tube series branch and a rectifier diode series branch, and also comprises two series diodes and two parallel diodes, wherein the switching tube series branch is provided with a first switching tube and a second switching tube, the rectifier diode series branch is provided with a first rectifier diode and a second rectifier diode, the two series diodes are respectively serially connected between the first switching tube and a negative busbar and between the second switching tube and a positive busbar, the two parallel diodes are respectively connected in parallel between a common terminal of the first switching tube and the positive busbar and between the common terminal of the second switching tube and the negative busbar, wherein reverse recovery time of the parallel diodes corresponding to the first switching tube is less than that of the first switching tube, and reverse recovery time of the parallel diodes corresponding to the second switching tube is less than that of the second switching tube. Because reverse recovery characteristics of the parallel diodes are better, a reverse recovery current is smaller without damaging the totem-pole bridgeless power factor correction (PFC) circuit working in a CCM (Coincident-Current Memory) mode.
Owner:EMERSON NETWORK POWER ENERGY SYST NORTH AMERICA
Switching power supply converter control circuit and control method thereof
ActiveCN106533214AEasy to set upRealize constant voltage and constant current functionEfficient power electronics conversionAc-dc conversionTransformerPeak current
The present invention relates to a switching power supply converter control circuit and a control method thereof. The circuit comprises an output signal sampling and holding module, an error amplifier, a serrated signal generator, a PWM comparator, a demagnetization detection comparator, a timing module, a demagnetization time maintenance iteration module, a positive degree side median current sampling module, a constant current calculation module and a peak value current comparator. Through adoption of the coupling relation of the transformer secondary coil and the auxiliary coil, the output signal sampling and holding module samples the feedback signals showing the voltage of the secondary coil at the transformer demagnetization stage; the sampling signals and the standard voltage are amplified through the error amplifier, the output of the error amplifier and the serrated signals are modulated to generate PWM signals to control the conduction of the power tube; and at the power tube conduction stage, the pressure drop of the positive degree side power sampling resistor is larger than the threshold voltage calculated by a constant current loop, and the power tube is turned off. The switching power supply converter control circuit and the control method thereof allow the switching power supply worked in the CCM mode to realize the constant voltage function in various work modes.
Owner:WUXI SI POWER MICRO ELECTRONICS
Cryptographic systems and methods supporting multiple modes
InactiveUS20080240424A1Reduce in quantityIncrease ratingsEncryption apparatus with shift registers/memoriesSecret communicationPlaintextCiphertext
Cryptographic systems and methods that support multiple modes of operation, such as CBC, CTR and / or CCM modes. In one aspect, a method for encrypting data includes reading a plaintext data block from a memory, storing the plaintext data block in an input buffer, encrypting the plaintext data block in the input buffer using a first mode to generate a first ciphertext, storing the first ciphertext in an output buffer, encrypting the plaintext data block in the input buffer using a second mode to generate a second ciphertext. For example, in a CCM mode of operation wherein the first mode is a CTR (counter) mode and the second mode is a CBC (cipher block chaining) mode, the block of plaintext that is initially read from memory and stored in the data input register is applied to both the CTR and CBC modes, thereby reducing a number memory read operations as in conventional CCM modes.
Owner:SAMSUNG ELECTRONICS CO LTD
Cryptographic systems and methods supporting multiple modes
ActiveUS7336783B2Increased encryption/decryption rateReduce in quantityEncryption apparatus with shift registers/memoriesSecret communicationPlaintextCiphertext
Cryptographic systems and methods that support multiple modes of operation, such as CBC, CTR and / or CCM modes. In one aspect, a method for encrypting data includes reading a plaintext data block from a memory, storing the plaintext data block in an input buffer, encrypting the plaintext data block in the input buffer using a first mode to generate a first ciphertext, storing the first ciphertext in an output buffer, encrypting the plaintext data block in the input buffer using a second mode to generate a second ciphertext. For example, in a CCM mode of operation wherein the first mode is a CTR (counter) mode and the second mode is a CBC (cipher block chaining) mode, the block of plaintext that is initially read from memory and stored in the data input register is applied to both the CTR and CBC modes, thereby reducing a number memory read operations as in conventional CCM modes.
Owner:SAMSUNG ELECTRONICS CO LTD
Control circuit of switch power supply and method thereof
ActiveCN106849675ALower component costsReduce design costDc-dc conversionElectric variable regulationControl signalPeak value
The invention discloses a control circuit of a switch power supply and a method thereof. The method comprises the following steps: a constant-current control module generates and outputs a control signal for controlling an output current of the switch power supply according to feedback information on a pin FB and a pin CS, adjusts a power-on duty ratio of a power transistor, and adjusts an output current IO of a power supply system as a constant value; a constant-current precision compensation module adjusts a circuit calculation parameter of the constant-current control module and a sampling and holding module according to the feedback information on the pin FB and the pin CS, so that the output constant-current precision is not influenced by the change of a working mode and / or the change of an input condition; a timer determines a moment when the voltage VFB on the pin FB reaches a peak value; and a pressure control oscillator adjusts the switching frequency of a power transistor according to a control signal outputted by the constant-current control module and an output signal of the timer, so that the switch power supply works at a QR mode or a CCM mode, and when the output voltage is changed, the QR mode is kept unchanged or the current continuous depth of the CCM mode is kept similar.
Owner:WUXI CHIPOWN MICROELECTRONICS
Power factor correction converter with wide load range
InactiveCN106787668AOvercome the need to change the hardware circuitOvercoming Control Algorithm ChallengesEfficient power electronics conversionEnergy industryAverage currentEngineering
The invention discloses a power factor correction converter with a wide load range. When the converter works in a CCM mode in a full load way, traditional average current control is used as a control strategy; and when the converter works in MCM and DCM modes in a light load way, improved average current control is used as the control strategy. Inductive current sampling correction is increased so that the current obtained by sampling equals to an average value, the feedforward value of duty ratios suitable for CCM and DCM modes undergoes mode discrimination and is then added to a duty ratio calculated by a current loop to obtain a final duty ratio which is used to control a switch tube, and power factor correction is realized. The power factor correction converter with the wide load range overcomes the problems that a traditional PFC converter needs to change a hardware circuit and a control algorithm when working in the light load way, average current control is combined with duty ratio feedwarding to solve the problem that prediction current control is sensitive to circuit parameters, more stable control is easy to realize, and a DCM algorithm based on average current is low in change amount and easy to realize.
Owner:NANJING UNIV OF SCI & TECH
Novel three-port Boost integrated converter for photovoltaic energy storage system and control method
ActiveCN110336459AFlexible controlHighly integratedBatteries circuit arrangementsDc-dc conversionLoop controlTerminal voltage
The invention discloses a novel three-port Boost integrated converter for a photovoltaic energy storage system. The three-port Boost integrated converter only has one switching transistor. An inductorL1 works in a DCM mode, and an inductor L2 works in a CCM mode. By using a PWM+PFM hybrid modulation strategy and adjusting a duty cycle D and a switching frequency fs, PFM closed-loop control is applied to the photovoltaic array terminal voltage and PWM closed-loop control is applied to the load terminal voltage so as to control the photovoltaic array terminal voltage and the load terminal voltage. Compared with the main circuit of a traditional photovoltaic energy storage system which is formed by a cascaded Boost photovoltaic interface PWM converter and Boost energy storage interface PWM converter, the provided three-port Boost integrated converter removes one switching transistor and its driving module, improve system integration and efficiency, and reduce costs.
Owner:NANTONG UNIVERSITY
Buck converter threshold detection for automatic pulse skipping mode
ActiveUS20100007318A1Increase flexibilityEfficient power electronics conversionDc-dc conversionTime delaysĆuk converter
Circuits and methods to detect a threshold for entering and leaving a discontinuous current mode of a buck converter have been disclosed. A buck converter is switched to continuous mode if the filtered battery current has reached a defined threshold current Ithccm. In order to expedite the transition from DCM mode to CCM mode the time delay between two or more pulses of a current through an inductor is monitored and the buck converter is switched to CCM mode if this time delay is smaller than a defined threshold.
Owner:DIALOG SEMICONDUCTOR GMBH
Method for generating root key in secure trusted execution environment (TEE)
ActiveCN108449178AImprove securityImprove reliabilityKey distribution for secure communicationPasswordUser input
The invention discloses a method for generating a root key in a secure trusted execution environment (TEE). The method includes the following steps: S1, calculating the formula Key1=PBKDF2(Password, Salt, it), wherein Password is a password input by a user, Salt is a random number generated internally by the TEE, and it is the number of iterations; S2, calculating a root key UserRootKey=Argon2(Key1, HWUID, Salt, SecretFactor, it, M), wherein M is a memory occupancy value, SecretFactor is a confidentiality factor that is built in a TEE operating system and protected by a confusion technique, and HWUID is a hardware unique identification number; S3, calculating the formula Key3=Argon2(UserRootKey, Salt, it, M); and S4, generating a data encryption key DEK and a random number Nonce in a CCM mode by using a random number generator, and calculating the formula EDEK=AES-CCM(UserRootKey, DEK, Nonce). The scheme of the invention has the beneficial effect that by adding a user PIN as another input factor derived from the root key, the security and reliability of the root key can be enhanced.
Owner:BEIJING BEANPOD TECH CO LTD
Power factor correction circuit for reducing harmonic distortion of LED (light-emitting diode) drive circuit
InactiveCN102497701ATo achieve the purpose of PFCEfficient power electronics conversionElectric light circuit arrangementTotal harmonic distortionAverage current
The invention relates to a power factor correction circuit for reducing the harmonic distortion of an LED (light-emitting diode) drive circuit, which adopts an average current mode in a CCM (continuous conduction mode). The circuit comprises a multiplier, an operational amplifier and a PFC (power factor correction) comparison amplifier, wherein the circuit adopts a corrected input current (Isense), and a signal obtained after the input current (Isense) is changed with an input voltage is taken as an input end of the multiplier; a current value obtained by virtue of a resistor after a line voltage (IAC) of an alternating voltage of the circuit is rectified is taken as another input end of the multiplier; and an average value (Vrms) end of the input voltage adopts a squarer, and an LED lamp is driven by using a CCM technique.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY
Improved wide load range boost type power factor correction converter
InactiveCN107979279AInhibition effectImprove power factorEfficient power electronics conversionAc-dc conversionCapacitanceControl signal
The invention discloses an improved wide load range boost type power factor correction converter, comprising a main circuit (1) and a control circuit (2). The main circuit (1) comprises an AC source (3), a rectifier bridge circuit (4), a Boost circuit (5), and a load (6). The control circuit (2) comprises a sampling correction module (7), a voltage loop module (8), a current loop module (9), and aPWM module (10). The invention is characterized in that the output of the AC source (3) is connected to the input of the rectifier bridge circuit (4), turning into steamed bread wave, which is used as the input end of the Boost circuit (5); the load (6) is connected to two ends of the output capacitor (Co) of the Boost circuit (5) in parallel; the control circuit parts (7, 8, 9, 10) are control signals in the internal DSP; the output of the sampling correction module (7) and the voltage ring module (8) is used as the input of the current ring module (9), and the output of the current ring module (9) is used as the input of the PWM module (10). The invention is advantageous in that when a converter works in a CCM mode, the correction method brought forward will not affect the duty ratio; as for the PFC converter with wide-load range, the same program is adopted for correction, and the calculation time of the program can be reduced.
Owner:NANJING UNIV OF SCI & TECH
Three-port integrated converter for photovoltaic energy storage system, and control method
ActiveCN110212842AHighly integratedLow costBatteries circuit arrangementsPV power plantsCapacitanceMaximum power point tracking
The invention discloses a three-port integrated converter for a photovoltaic energy storage system; the converter comprises two switch tubes, three capacitors, three diodes and three inductors, wherein the three capacitors are connected with a storage battery, a photovoltaic module and a load in parallel respectively. The first switch tube, the second switch tube, the first diode, the second diodeand the first inductor form a Buck-BOOST circuit, so that bidirectional flow of energy of the storage battery and the photovoltaic module is realized; and the first switch tube, the third diode and the second inductor form a Boost circuit, so that the energy flow of the photovoltaic assembly to the load is realized. According to the converter, the power switch is integrated through multiplexing of the switch tubes, so that a switch tube and a driving module are reduced, the integration degree of the converter is improved, and the cost is lowered. The invention further discloses a control method of the converter. The first inductor is controlled to work in a CCM mode, and the maximum power point tracking control of the photovoltaic module is realized by adopting a variable duty ratio; andthe second inductor is controlled to work in a DCM mode, and load constant-voltage control is realized by adopting variable-frequency control.
Owner:NANTONG UNIVERSITY
Power factor correction method for LED (light-emitting diode) lighting
InactiveCN102497700AImprove conversion efficiencyReduce heat dissipationEfficient power electronics conversionElectric light circuit arrangementPower factor correctorCCM mode
The invention discloses a power factor correction method for LED (light-emitting diode) lighting, which adopts an average current control mode in a CCM (continuous conduction mode). The method comprises the following steps that: after an input alternating voltage is rectified, the rectified voltage is converted into a first current signal (IAC) by a resistor (RAC); the waveform of the first current signal (IAC) is the envelope of the input rectified voltage, the signal and a detection current (ISENSE) of an inductor are superposed, and after the superposed current is corrected, a second current signal (I) is outputted, and the second current signal (I) is used as an input end of an operation module; and an input-end predicted voltage signal (VRMS) obtained by scaling down in equal proportion and filtering an average value of input voltages is taken as an input end of the operation module.
Owner:NORTH CHINA UNIVERSITY OF TECHNOLOGY
Buck converter threshold detection for automatic pulse skipping mode
ActiveUS9013163B2Increase flexibilityEfficient power electronics conversionDc-dc conversionTime delaysĆuk converter
Circuits and methods to detect a threshold for entering and leaving a discontinuous current mode of a buck converter have been disclosed. A buck converter is switched to continuous mode if the filtered battery current has reached a defined threshold current Ithccm. In order to expedite the transition from DCM mode to CCM mode the time delay between two or more pulses of a current through an inductor is monitored and the buck converter is switched to CCM mode if this time delay is smaller than a defined threshold.
Owner:DIALOG SEMICONDUCTOR GMBH
A control method for improving the output precision of a switching power supply
ActiveCN109004840AImprove output accuracyHigh precisionDc-dc conversionElectric variable regulationLower limitControl system
A control method for improving the output accuracy of a switching power supply in accordance with an embodiment of that present invention, precision control module, error calculation module, the PID module and the PWM module constitute the control system, the control system is connected with the controlled switching power supply to form a closed loop, By detecting an output voltage control mode switch, When the output voltage exceeds the upper limit voltage, the circuit enters the DCM mode by mode switching to reduce the input energy so as to stabilize the output voltage in the regulating range. When the output voltage is lower than the lower limit voltage, the circuit enters the CCM mode by mode switching to increase the input energy so as to quickly restore the output voltage to the regulating range. In the normal regulation process, the output voltage is limited between the upper limit voltage and the lower limit voltage, the voltage output ripple is reduced, and the accuracy is improved.
Owner:SOUTHEAST UNIV
Synchronous rectification control circuit
ActiveCN106452086AAvoid fryerPrecise controlEfficient power electronics conversionEmergency protective circuit arrangementsEngineeringInductor
The invention discloses a synchronous rectification control circuit, and the circuit comprises a primary side circuit and an auxiliary side circuit. The primary side circuit comprises a primary side inductor, a primary side switching tube, and a primary side sampling resistor. The auxiliary side circuit comprises an auxiliary side inductor, an auxiliary switching tube, an auxiliary side first sampling resistor, an auxiliary side second sampling resistor, an auxiliary side capacitor, an auxiliary side load resistor, and a synchronous rectification control chip. The circuit detects the voltage Vd of a leakage end, connected with an auxiliary switching tube SR_MOSFET, of the auxiliary side inductor in a mode of cycle-by-cycle analogy, can enable an IC in a DCM / CCM mode to precisely control the time point of discharging finishing, effectively judges the switching-off point, achieves an advanced switching-off function, and solves a difficult problem that the precise switching-off cannot be achieved at the DCM / CCM modes at the same time in the prior art. The circuit can simplify the peripheral application circuits, and reduces application devices.
Owner:SHAANXI REACTOR MICROELECTRONICS
CCM-based micro inverter and control method thereof
ActiveCN103647453ALow costReduce switching frequencyDc-dc conversionSingle network parallel feeding arrangementsElectricitySTM32
The invention discloses a CCM-based micro inverter and a control method thereof. The micro inverter employs a universal ARM chip STM32 as a main control chip of a micro inverter control system, by use of AD conversion of the chip, and the inherent functions of a timer, a temperature sensor and an embedded FLASH and the like, the requirements for micro inverter AD conversion, PWM wave duty ratio control, power failure protection and temperature protection are finished, and the system total cost is lowered; the control method enables a micro inverter flyback transformation circuit to work in a CCM, reduces the switch frequency, enables the control of the universal ARM chip STM32 to be realized, reduces switch loss at the same time, reduces requirements for a filter, further decreases the system cost and improves the working efficiency, and the actual measured highest efficiency can reach 94.63%.
Owner:CHANGSHA VICTORY ELECTRICITY TECH
DCM (discontinuous conduction mode) control method of wind power generation current transformer BOOST circuit
ActiveCN103746558AEasy to controlAccurate trackingDc-dc conversionWind energy generationReference currentDiscretization
The invention discloses a DCM control method of a wind power generation current transformer BOOST circuit. By use of a digital control technology, operation control is carried out in a microprocessor or a digital signal processor chip through software. The invention describes the mechanism of the DCM of a boost chopper boost circuit under the digital control technology, brings forward a realization method of accurately describing digital discretization control under the DCM, and points out a determining method of the DCM and a CCM (continuous conduction mode). Of course, the method provided by the invention is also applied to the CCM. According to a boost control model in the embodiment of the invention, no stable state errors are generated, and reference current can be accurately tracked.
Owner:BEIJING ETECHWIN ELECTRIC
Quadratic Boost converter with low capacitance voltage stress
InactiveCN110535339AReduce voltage stressReduce in quantityDc-dc conversionElectric variable regulationEngineeringVoltage source
The invention discloses a quadratic Boost converter with low capacitance voltage stress. The quadratic Boost converter comprises a DC voltage source, two inductors, a switching tube, three diodes, twocapacitors and a load. The drain of the switching tube is connected with one end of the second inductor. The anode of the second diode is connected with the cathode of the third diode. The anode of the first capacitor is connected with the cathode of the first diode, the other end of the second inductor and the cathode of the second capacitor. One end of the first inductor is connected with the anode of the first diode and the anode of the third diode. The anode of the second capacitor is connected with the cathode of the second diode and one end of the load. The positive electrode of the DCvoltage source is connected with the other end of the first inductor and the cathode of the first capacitor. The negative electrode of the DC voltage source is connected with the source of the switching tube and the other end of the load. The first inductor and the second inductor operate in the CCM mode. The converter has only one switching tube and has the characteristics of high gain and low capacitance voltage stress so as to be especially suitable for high voltage and high power application occasion.
Owner:NANTONG UNIVERSITY
Driving circuit, synchronous rectification circuit and synchronous rectification device
ActiveCN110034684AControl onControl shutdownEfficient power electronics conversionDc-dc conversionControl signalComparators circuits
The invention is applicable to the technical field of electronics, and provides a driving circuit applied to a synchronous rectification tube, a synchronous rectification circuit and a synchronous rectification device. The driving circuit comprises a first voltage generation circuit, an under-voltage comparator circuit, a synchronous rectification tube starting comparator circuit, a synchronous rectification cutoff comparator circuit, a continuous mode working mechanism circuit, a logic circuit and a driving circuit, a corresponding driving control signal is output by detecting a drain voltagesignal and a system voltage signal of the synchronous rectification tube, and the driving of the synchronous rectification tube is achieved. With the driving circuit provided by the scheme, the starting and the cutoff of the synchronous rectification tube can be effectively controlled, a phenomenon that a primary side and a secondary side communicate with each other can be prevented no matter whether the primary side works in a DCM mode, a QR mode or a CCM mode, so that a secondary flywheeling diode can be effectively substituted by the synchronous tube, and the system efficiency is improved.
Owner:SHENZHEN WINSEMI MICROELECTRONICS
Control method for PI (power to loop) resonance of photovoltaic grid-connected inverter based on switching of CCM (continuous current mode) and DCM (discontinuous current mode)
ActiveCN104485687AReduce the effect of output currentReduce the impactSingle network parallel feeding arrangementsPhotovoltaic energy generationCurrent modeAlternating current
The invention relates to a control method for PI (power to loop) resonance of a photovoltaic grid-connected inverter based on switching of CCM (continuous current mode) and DCM (discontinuous current mode). When the absolute value of grid-connected voltage Vo outputted by the photovoltaic inverter is higher than or equal to boundary voltage Vbo, the CCM control method is adopted; when the absolute value of the grid-connected voltage Vo outputted by the photovoltaic inverter is lower than the boundary voltage Vbo, the DCM control method is adopted. Under different working modes, the occupation space ratio of an alternating current small signal is adjusted by a PI resonance controller, so as to obtain the total occupation space ratio. According to the total occupation space ratio, the corresponding PWM (pulse width modulation) wave is generated to control the action of a pre-stage MOS (metal oxide semiconductor) tube, so as to enable the photovoltaic inverter to realize grid-connected output. The control method has the advantages that the harmonics of grid-connected current flowing through a zero point can be effectively eliminated, and the grid-connecting efficiency and grid-connecting quality of the inverter are improved.
Owner:华氢能源动力科技江苏有限公司
Impedance matching method based on circuit switching frequency
InactiveCN109525111AImprove transmission efficiencyDc-dc conversionElectric variable regulationEngineeringSwitching frequency
The invention relates to an impedance matching method based on a circuit switching frequency and belongs to the field of wireless energy transmission. For the problem of the reduction of system transmission efficiency due to the dynamic change of an equivalent load during the charging process of a WPT system battery, a Boost circuit is used, the impedance matching is achieved by changing the switching frequency of the Boost circuit, the input equivalent impedance of a secondary side is reduced, the reflection impedance is increased, the transmission efficiency of a coupling coil is improved, and the method is suitable for an application where the load has large voltage, low current and a large equivalent impedance value. On the basis of obtaining the impedance transformation relationship of the Boost circuit in a DCM mode and a CCM mode, the equivalent load can be maintained to be near an optimal load by adjusting a Boost switching frequency, and therefore, the maximum efficiency transmission is achieved.
Owner:STATE GRID ZHEJIANG ELECTRIC POWER COMPANY TAIZHOU POWER SUPPLY +1
A power module for a power analyzer
ActiveCN106300966BImprove stabilityAvoid damageDc-dc conversionElectric variable regulationControl signalEngineering
The invention relates to the field of power circuit, in particular to a power supply module for a power supply analyzer. On one hand, the power supply module provided by the invention uses the sampling current and the sampling voltage, combining the zigzag wave control signal issued by the control circuit, to generate zigzag waves in any specified waveforms. On the other hand, an anti-backflow circuit is arranged in the front end of the power conversion circuit to effectively prevent the device damages caused by the reverse current. A dummy load circuit is arranged at the output end of the power conversion circuit, to effectively solve the problem that when the output voltage is small, and the duty ratio of the PWM has decreased to the minimum value, if the power output is without load at this moment, since the energy storage inductance cannot work in the CCM mode, this will lead to the discontinuity of PWM, and will cause the unstable output shocks and larger ripple waves.
Owner:CHNEGDU CHIFFO ELECTRONICS INSTR
Automatic dead time optimization system in CCM of primary side feedback type flyback power supply
ActiveCN109995228AReduce lossDead time optimizationEfficient power electronics conversionDc-dc conversionAverage currentClosed loop
The invention discloses an automatic dead time optimization system in a CCM of a primary side feedback type flyback power supply. According to the system, a control system composed of a single-outputDAC midpoint sampling module, a digital control module, a current detection module, a dead time calculation module and a PWM driving module, and a controlled synchronous rectification primary side feedback type flyback converter forms a closed loop; through a DAC sampling mechanism, a primary side current is sampled to calculate a secondary side average current; a primary side average current Imid_p and the secondary side average current Is(tmid) in the CMM are obtained; the secondary side current is input to the dead time calculation module to obtain a reasonable dead time td; finally the PWMdriving module is jointly controlled through a primary side feedback loop and the obtained dead time td; and a primary side switch tube driving signal duty and a secondary side rectifier tube drivingsignal duty_SR are generated, so that the dead time between the closing of a secondary side rectifier tube and the opening of a primary side switch tube in the CCM can be reasonably optimized.
Owner:SOUTHEAST UNIV +1
Logic control circuit of slope compensation signal in peak current mode DC-DC converter
ActiveCN109980920AReliable controlAvoid overcompensationApparatus without intermediate ac conversionDc dc converterMode control
The invention discloses a logic control circuit of a slope compensation signal in a peak current mode DC-DC converter, and belongs to the technical field of electronic circuits. A counter current detection module is used for detecting whether the peak current mode DC-DC converter suffers from a counter current or not, and when the peak current mode DC-DC converter suffers from the counter current,it proves that the DC-DC converter is in a DCM working mode, and the counter current detection module outputs a high level; when the counter current detection module does not detect the counter current, it proves that the DC-DC converter is in a CCM working mode, and the counter current detection module outputs a low level; a logic control module carries out detection on the rising edge of each clock period of the DC-DC converter according to the judgment of the DC-DC converter working mode by the counter current detection module, wherein when the DC-DC converter is in the CCM mode, the DC-DCconverter is controlled to output the slope compensation signal as normal; and when the DC-DC converter is in the DCM mode, the slope compensation signal of the DC-DC converter is eliminated, so thatthe problem of over-compensation of the peak current mode system during DCM can be effectively prevented, and the DC-DC converter has an ideal peak current mode control performance.
Owner:深圳市泰德半导体有限公司
A switching control circuit and method, and a switching power supply system
PendingCN109217666AInput stableStable controlDc-dc conversionElectric variable regulationCycle controlControl signal
The invention discloses a switching control circuit and method, and a switching power supply system. The switching control circuit comprises an on-time control circuit, an off-time control circuit anda logic circuit. The logic circuit is used for generating a switch control signal gate according to the output signal of the on-time control circuit and the off-time control circuit, and outputting the switch control signal gate to the switch to control the on-time control circuit and the off-time control circuit to the switch. The logic circuit can output a switch control signal gate for controlling the switch to be turned on only after the switching off time length reaches a predetermined proportion of the switching off time length of the previous cycle. The switch control circuit and method of the invention, Switching power supply system, can make blanking time no longer fixed, can be in different occasions, or when the system is unstable adaptive switch conduction point time, can control the adjacent switching cycle more stable, effectively avoid switching cycle abrupt change and inductor current in the earlier stage into the CCM mode, to achieve stable control of the output.
Owner:SHENZHEN KIWI MICROELECTRONICS CO LTD
Novel LED control drive circuit
ActiveCN107172767ASmall output voltage rippleGuaranteed lifeElectrical apparatusElectroluminescent light sourcesDriver circuitAudio power amplifier
Owner:无锡恒芯微科技有限公司
LED driving circuit
ActiveCN104619092AReduce lossImprove efficiencyElectric light circuit arrangementEnergy saving control techniquesCCM modeLow input
The invention provides an LED driving circuit. The LED driving circuit comprises an AC input switch (110), a rectifying filter module (120) of which the input end is connected with the AC input switch (110), a current regulating module (130) for providing constant current to a loaded LED, and a power supply module (140) of which the input end is connected with the rectifying filtering module (120); the output end of the rectifying filter module (120) is connected to the current regulating module (130). The LED driving circuit (100) further comprises a control module (150); the current regulating module (130) is used for sending a sampling signal to the control module (150); the power supply module (140) supplies working voltage to the control module (150). According to the LED driving circuit, the automatic selecting mode is adopted, thus the circuit can work in the BCM mode in case of high input voltage so as to reduce switch consumption, and the circuit automatically enters the CCM mode in case of low input voltage so as to effectively increase the efficiency of working at low voltage, and moreover, the minimum working voltage is reduced; meanwhile, noise can be avoided.
Owner:FREMONT MICRO DEVICES SHENZHEN LTD
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