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56results about How to "Eliminate inrush current" patented technology

Operation control method for parallel variable-speed constant-frequency wind generator set

InactiveCN101404476AStable and accurate against the windTimely and safe releaseSingle network parallel feeding arrangementsElectric generator controlElectricityConstant frequency
An operation control method of a synchronization variable speed constant frequency wind generating set includes the strategies of AYC, synchronization control, low wind speed ceiling capacity follow control and high wind speed constant power control which includes the AYC, the synchronization control, the low wind speed ceiling capacity follow control and the high wind speed constant power control. An anemoscope and a wind vane measure the wind speed and wind direction information to generate a yaw deviation signal; a yaw motor is driven to execute left and right yaw according to the yaw direction and angle and limit the yaw velocity and meanwhile, the steering turns of the engine room are measured with the help of cables winding around a sensor, so as to execute safe untwist action, thus ensuring that the wind generating set realizes quick, accurate and safe effect of the wind wheel against wind. All the control strategies cooperate in work from the start to synchronization power generation according to the requirement of the set and external conditions, so as to ensure the safe and efficient operation of the wind generating set.
Owner:SOUTHEAST UNIV

Control system of one-frequency one-pump constant pressure water supply equipment

The invention discloses a one-frequency one-pump constant pressure water supply control system, which comprises a control unit (6) for controlling the operation of the system and controlling the output frequencies of frequency converters, a human-machine interface (7) for setting parameters of the system and monitoring operational data, the frequency converters (5a, 5b and 5c) for controlling the rotating speeds of water pump motors, and sensing instrument units (1, 3 and 4) connected with the control unit and used for acquiring external feedback information, wherein according to the control system, water pumps (2a, 2b and 2c) in a controlled pump group are matched with the frequency converters and controlled by adopting a common-frequency and common-speed control technology to implement constant pressure water supply.
Owner:重庆成峰水务工程有限责任公司

Two-control multi-constant-pressure water supply equipment control system and control method thereof

The invention discloses a water supply equipment control system. The system comprises a plurality of water pumps, two frequency converters, a control unit, a switching group and a water pressure sensor; the control ends of the two frequency converters are connected to the control unit, and the output ends of the two frequency converters are connected to a node A; the input end of each water pump is connected with the switching group, and the switching group is respectively connected with the control unit and the node A; the control unit controls the operation of the switching group; the switching group controls conduction or cut-off of the input ends of the water pumps and the node A; and the water pressure sensor is connected with the control unit and used for detecting the water outlet pressure of a water using point. The invention also discloses a control method of the water supply equipment control system. The system has the advantages of realizing soft start and soft stop of the water pumps, eliminating the impact current when the water pumps are started, avoiding water hammer effect, stabilizing the water supply pressure, prolonging the service life and the reliability of the equipment and better ensuring the water using safety of a user.
Owner:重庆成峰水务工程有限责任公司

Grid-connected startup method for photovoltaic grid-connected inverter

The invention discloses a grid-connected startup method for a photovoltaic grid-connected inverter. The grid-connected startup method comprises the following steps of: a, keeping an off state of an alternating current switch; b, respectively detecting the bus voltage and power grid voltage through a direct current (DC) voltage sensor and an alternating current (AC) voltage sensor, and transmitting a detection result to a control circuit; c, judging whether the bus voltage is higher than the peak voltage of the power grid through the control circuit, and switching on the AC switch if the bus voltage is higher than the peak voltage of the power grid; d, calculating inverter modulation waves with the same frequency and phase as the power grid voltage through the control circuit according to the amplitude, phase and frequency of the detected power grid voltage; and e, judging whether the power grid voltage crosses the zero point through the control circuit, and if the power grid voltage crosses the zero point, applying the inverter modulation waves to the photovoltaic grid-connected inverter, starting the operation of the photovoltaic grid-connected inverter and starting the grid-connected operation. According to the method, the condition that high phase deviation occurs between the inverter voltage and power grid voltage can be effectively avoided, high impact current is avoided, and the stability of the system is guaranteed.
Owner:深圳市英威腾光伏科技有限公司

Current source inverter with energy clamping circuit and its control method

The disclosed current source inverter with energy clamp circuit comprises: a voltage-reduced translator with input capacitor and output inductor to receive the dc input voltage and output induction current, a dc / ac converter with output capacitor to receive the last current and generate ac current, a load coupling with the dc / ac converter to provide discharge path and avoid impulse current, and an energy clamp circuit including two diodes. This invention reduces the voltage stress on transistors greatly, and avoids the generation of impulse current.
Owner:DELTA ELECTRONICS INC

Oil electro-hydraulic and hydrostatic hybrid driving system

The invention discloses an oil electro-hydraulic and hydrostatic hybrid driving system. The functions of rapid starting, rapid braking, controlling minus grade to be at constant speed and energy-saving can be realized by adopting a concept of supplying oil for accelerated starting with a hydraulic assisted starting motor, a main hydraulic system and an energy storage system, and controlling the torque of a motor through a hydraulic energy accumulation system, and the overall installed power can be reduced while the climbing ability can be increased. By virtue of the assisted starting, the impulse current of the motor is mainly eliminated, not only can the rated power of electric elements be reduced, but also the working life of a storage battery and the mileage of the whole vehicle can be prolonged. By adopting the motor and a diesel engine as double power, the good starting acceleration performance can be realized, and good low-speed stepless regulation capability can also be achieved. The oil electro-hydraulic and hydrostatic hybrid driving system can be switched to a mechanical driving system in high-speed driving, so that the whole machine has higher driving efficiency. The diesel engine provides power for powerless batteryor high-speed driving on the ground, not only can the tail gas pollution in a tunnel be avoided, but also the intermittent driving of vehicles can be guaranteed.
Owner:成都岁生科技有限责任公司

Solar photovoltaic charge control device

The invention discloses a solar photovoltaic charge control device. A PWM signal drive component (6) comprises an RC low pass filter (61), a PWM chip (62) and a logic gate circuit (63) which are connected in series, and is used for providing drive signals of an auxiliary switch (31), a main switch (32) and a synchronous rectification switch (33) to a DC-DC conversion component (3) in time sequence according to PWM duty ratio signals of a microprocessor (5). The DC-DC conversion component (3) is composed of the main switch (32) with the two ends being connected with first resonance capacitors (C1) in parallel, the synchronous rectification switch (33) with the two ends being connected with second resonance capacitors (C2) in parallel, the auxiliary switch (31), a resonance inductor (Lr) and a filter inductor (Lf). The DC-DC conversion component (3) is used for sequentially enabling the synchronous rectification switch (33) to be turned off with zero current, the main switch (32) to be turned on with zero voltage and then turned off with quasi zero voltage according to set time of duty ratio, and the synchronous rectification switch (33) to be turned on with zero voltage and drop voltage of the synchronous rectification switch (33) at a steady state by not higher than 0.1 V. The solar photovoltaic charge control device can be widely applied to high-power photovoltaic electricity generation systems.
Owner:HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI

Precharge soft starting circuit for three-phase voltage type bi-directional PWM current transformer

A precharge soft starting circuit for a three-phase voltage type bi-directional PWM current transformer comprises a first contactor K1, a three-phase diode rectifier bridge TM, a BUCK-BOOST circuit, a second contactor K2 and a DSP, wherein a three-phase alternating voltage source is connected with the alternating-current side of the three-phase diode rectifier bridge TM through the first contactor, the direct-current side of the three-phase diode rectifier bridge TM is connected with the BUCK-BOOST circuit, the BUCK-BOOST circuit is connected with the second contactor K2, the second contactor K2 is connected with the two sides of a direct-current end bus capacitor, and the first contactor K1, the controlled end of the BUCK-BOOST circuit and the second contactor K2 are all connected with the control end of the DSP. Current surge in the starting process is effectively avoided, so that service life is prolonged.
Owner:ZHEJIANG UNIV OF TECH

Rectification and filtering device and method for suppressing power-on surge current

The invention provides a rectification and filtering device for suppressing power-on surge current. The rectification and filtering device comprises a first rectification circuit, a relay, a filtering capacitor and a zero-crossing conduction control circuit for detecting zero crossing points of an alternating current and controlling the relay. The relay comprises a coil and a contact point. A first end of the first rectification circuit is connected with one end of the contact point; the other end of the contact point is connected with one end of the filtering capacitor; the other end of the filtering capacitor and a second end of the first rectification circuit are grounded; the two ends of the coil are connected with the two ends of the zero-crossing conduction control circuit respectively; the other two ends of the zero-crossing conduction control circuit are connected with the two ends of the alternating current respectively; and the other two ends of the zero-crossing conduction control circuit are further connected with a third end and a fourth end of the first rectification circuit respectively. The invention also relates to a method by utilizing the device above. By applying the rectification and filtering device and method for suppressing the power-on surge current, the following beneficial effects can be achieved: the appearance of surge current can be completely eliminated, and hardware cost is reduced.
Owner:SHENZHEN LONGOOD INTELLIGENT ELECTRIC

Single-level power factor correction converter circuit

The invention is concerned with the correcting convertor of the single power factor circuit. The positive output end of the rectifier of the transformer meets the tip of the primary winding of the transformer, the bottom of the primary winding of the transformer meets the negative output end of the rectifier with the switch in the middle, the cathode of the first diode meets the positive end of the rectifier, the anode of the first diode meets the negative end of the rectifier with the circuit in series in the middle, which composes by the second diode and the second winding of the transformer, the storing capacitance anode meets the connecting point that is in the middle of the series circuit and the first diode anode, the storing capacitance cathode meets the negative end of the rectifier. The invention can eliminate the surge current generated by the power during starting up, can reduce the voltage of the storing capacitance to less than 250V, and it can recycle the magnet leakage energy of the transformer to improves power efficiency. It suits for the switch power in middle or small power.
Owner:曹文领

Impulse current inhibiting circuit and supply circuit

The invention discloses an impulse current inhibiting circuit and a supply circuit; when a constant current source is transformed into loaded state from unloaded state, a first control unit detects the output current of a main circuit of the constant current source and controls a first output switch to turn off and the main circuit of the constant current source to shutdown when the output current is no less than a predetermined current threshold value; a first discharge unit detects the predetermined parameter of the circuit and discharges an output capacitor when the predetermined parameter satisfies the discharge condition, namely the first discharge unit discharges the output capacitor when the impulse current exists in the supply circuit; the constant current source re-starts again at loaded state when the charge on the output capacitor is discharged to a certain degree, the voltage on the output capacitor slowly increases from a lower set value without occurring the impulse current. According to the technical scheme, the impulse current problem caused by the voltage instantaneous discharge on the output capacitor in the transformation process of the constant current source from unloaded state to loaded state is solved.
Owner:INVENTRONICS HANGZHOU

Reactive compensation device and method for partially regulating voltages and capacitance of three-phase four-wire power grid

The invention discloses a reactive compensation device and method for partially regulating voltages and capacitance of a three-phase four-wire power grid. The reactive compensation device comprises a U-phase voltage and capacitance regulating reactive compensation unit, a V-phase voltage and capacitance regulating reactive compensation unit, a W-phase voltage and capacitance regulating reactive compensation unit and a control unit. Each phase of voltage and capacitance regulating reactive compensation unit is mainly composed of a current detection element, a voltage detection element, a full-voltage compensation capacitor bank, an auto-transformer and a voltage-regulating capacitor bank. The control mode of independent reactive compensation in each phase is used in the three-phase four-wire power grid, total capacitance in each phase is uniform, the capacitance in each phase is evenly divided into n sets, wherein one set of the capacitance is subjected to voltage and capacitance regulation through the auto-transformer which totally has m levels of output voltages, each phase has n*m grades of compensation, and multi-level fine compensation for the power grid is achieved.
Owner:GUILIN UNIV OF ELECTRONIC TECH

Constant current starting circuit applied to boost converter

The invention discloses a constant current starting circuit applied to a boost converter, and belongs to the technical field of the electronic. The constant current starting circuit comprises a power level, a constant current starting module, a bias circuit module and an enabling module, wherein the bias circuit module is used for producing the constant first bias current and second bias current to provide for the constant current starting module; the enabling module is used for producing an enabling signal EN to control the on and off of the bias circuit module and the constant current starting module; the constant current starting module is used for limiting the power-level charging current as a fixed value by using a current mirror and the constant bias current. By clamping the charging current, namely the inductive current as the fixed value, the constant current charging at the soft starting stage is realized, and the surge current at the circuit starting stage of the boost converter is eliminated.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA +1

Starting method of grid-connected inverter

The invention relates to the technical field of grid-connected inverters. The invention relates to a starting method and particularly relates to a grid-connected inverter starting method. Whether a relay of the grid-connected inverter is bonded or not is judged by comparing the collected effective value of the inverter phase voltage with a preset first reference voltage value, in a commercial power period, a difference value between a collected current inversion phase voltage value and a mains supply phase voltage instantaneous value is compared with a preset third reference voltage value to control the on-off of the relay. The effectiveness of an inverter switch tube and a grid-connected relay is accurately detected before grid connection of the inverter, meanwhile, the impact current generated when the relay is closed and the impact current generated when the switch tube is driven to generate waves during grid connection are eliminated, and finally, the photovoltaic grid-connected inverter can be successfully connected with the grid and stably connected with the grid for a long time for power generation.
Owner:珠海银河耐吉科技股份有限公司

System for controlling temperature of continuous laser particle analyzer

The invention provides a system for controlling the temperature of a continuous laser particle analyzer, which is used for temperature control of an avalanche photo diode (APD) fluorescent detection part in the continuous laser particle analyzer. The system comprises a heat insulation shell, a triethyl citrate (TEC) refrigerator, a thermistor and a control device. The TEC refrigerator is used for regulating the temperature of the APD; the thermistor is used for detecting the temperature of the ADP; and the control device is used for monitoring and controlling. The system meets the requirement of precise temperature control, can be used for heating and refrigerating, has short response time and is flexible and convenient to use.
Owner:北京汇丰隆生物科技发展有限公司

Novel AC-DC-AC converter and control method thereof

ActiveCN101860230AStable outputFlexible adjustment of transmission powerAc-ac conversionCapacitanceBridge type
The invention discloses a novel AC-DC-AC converter, which comprises a power frequency power supply, a rectification circuit, an inverter circuit and a resonance circuit. The AC-DC-AC converter is characterized by also comprising a fifth switch tube, inductors connected in series and a fifth diode, wherein the inverter circuit is provided with a sixth diode and a seventh diode. The invention also discloses a control method, which controls on and off states of each switch tube by changing an operating mode symbol xi and duty ratio d, wherein xi is equal to 0 or 1, when xi is equal to 0, Ton is conducting time of the fifth switch tube, and when xi is equal to 1, Ton is straight-through time of the same bridge arm in a bridge type inverter circuit and T is resonance cycle. The AC-DC-AC converter has the advantages that: a switch drive control circuit realizes the change of the operating mode and the adjustment of the duty ratio; the main circuit structure is simple, and DC filtering capacitance as well as impulse current in the process of starting circuits are eliminated; and the resonant current is controlled in constant amplitude when input voltage is changed in a large scale.
Owner:重庆华创智能科技研究院有限公司

Control method and control device for inputting belt speed again of permanent magnet synchronous motor

The invention discloses a control method and control device for inputting belt speed again of a permanent magnet synchronous motor. The method comprises the steps of inputting a first control signal to a control end of an inverter so that an AC end of the inverter outputs a first voltage equivalent to a compensation voltage value when that a voltage exists in a power grid bus is detected, wherein the compensation voltage is acquired according to a current of an electrical end of the permanent magnet synchronous motor and a counter potential of the permanent magnet synchronous motor; inputting a second control signal to the control end of the inverter so that the AC end of the inverter outputs a second voltage equivalent to a working voltage, wherein the working voltage is acquired according to a preset current of a stator winding; and inputting a closed-loop control signal to the control end of the inverter so that the inverter enters closed-loop control. According to the method, an impact current during inputting again is eliminated by compensation current at an inputting moment; and according to the method, the impact current is eliminated by a software algorithm without adding other additional hardware on the condition of no influence on normal working of the permanent magnet synchronous motor, and the safety and the stability of a motor system are remarkably improved.
Owner:HUAZHONG UNIV OF SCI & TECH

Starting control method and device of flexible DC power transmission converter valve

The invention relates to a starting control method and device of a flexible DC power transmission converter valve. The control method comprises the steps of putting a soft starting resistor, and charging sub-modules of a bridge arm; executing voltage-sharing sequencing operation on the sub-modules, removing a part of sub-modules in a bridge arm; and bypassing the soft starting resistor, and shutting all sub-modules which are not removed in the bridge arm and at least one sub-module which is removed so as to adjust a voltage of the bridge arm. By controlling the sub-modules which are removed involtage-sharing sequencing operation of an input part when the soft starting resistor is bypassed, a production condition that a phase step voltage is removed by the voltage of the bridge arm to damage an impact current can be adjusted, impact brought by bypassing the soft starting resistor is eliminated so as to prevent the impact current at an AC side, and the safety of a converter valve systemis ensured.
Owner:XUJI GRP +3

Energy-saving variable frequency pump control cabinet

The invention relates to an energy-saving variable frequency pump control cabinet. The energy-saving variable frequency pump control cabinet comprises a variable frequency control cabinet, a pressure sensor and a water pump, wherein the pressure sensor is mounted on a water supply pipeline connected with the water pump; the variable frequency control cabinet is used for receiving signals of the pressure sensor to regulate the rotation speed of the water pump and comprises a cabinet body, a frequency converter, a program controller, a contact device, an intermediate relay, a thermal relay, an air switch and a main circuit wiring terminal; and the frequency converter, the program controller, the contact device, the intermediate relay, the thermal relay, the air switch and the main circuit wiring terminal are arranged in the cabinet body, the main circuit wiring terminal is connected with the frequency converter, the program controller, the contact device, the intermediate relay, the thermal relay and the air switch, respectively. According to the energy-saving variable frequency pump control cabinet, the pressure can be set according to requirements, and the rotation speed of the water pumps and the operation number of the water pumps can be automatically adjusted according to the set pressure, so that the energy-saving variable frequency pump control cabinet can work at a high-efficiency and energy-saving optimal state.
Owner:SUZHOU ZHONGJIN ELECTRIC TECH

Long-time low-drift integrator and control method thereof

The invention provides a long-time low-drift integrator and a control method thereof. The long-time low-drift integrator comprises a temperature control module, an integration module, a semiconductor refrigerator, and a temperature detection sensor. The temperature control module is connected with the semiconductor refrigerator. The integration module and the temperature detection sensor are arranged on a controlled temperature surface of the semiconductor refrigerator. The temperature detection sensor is connected with the temperature control module. The temperature control module is used for controlling and stabilizing the temperature of the semiconductor refrigerator. The integration module realizes integral zero compensation. The long-time low-drift integrator can be stabilized at a controlled temperature point in a short time, the surge current of the semiconductor refrigerator is eliminated, and fluctuation of stable temperature is small. The temperature control module makes temperature-sensitive devices in the integration module work at a constant temperature, integral drift caused by parameter change of the devices is reduced, nonlinear drift can be reduced effectively, temperature control is stable, and the long-time integral drift is small.
Owner:HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL

Power transformer capable of eliminating excitation surge and application method thereof

The invention discloses a power transformer capable of eliminating excitation surge, relates to the electrical field and is mainly used for eliminating an excitation surge phenomenon of a traditionaltransformer. The transformer comprises a transformer main body, wherein the transformer main body is integrated with a high-voltage winding and a low-voltage winding and is also integrated with an electronic converter and an auxiliary winding, the electronic converter comprises a converter A and a converter B, the converter A is used for achieving AC / DC conversion, the converter B is used for achieving DC / AC conversion, the converter A is electrically connected with the auxiliary winding, and the converter B is electrically connected with the low-voltage winding. According to a magnetism and demagnetism principle, the auxiliary winding is connected with the electronic converter to handle the excitation surge phenomenon of the transformer body; by magnetism and demagnetism operation on an iron core, the iron core stability of zero-distortion requirement of the transformer body is achieved, the links such as an external switch and residual magnetism measurement are omitted, and the magnetic field modulation is free from constraint of breaking and closing time.
Owner:HEFEI UNIV OF TECH

Hierarchical voltage soft-start circuit for three-phase voltage PWM rectifier and control method thereof

The invention discloses a hierarchical voltage soft-start circuit for a three-phase voltage PWM rectifier and a control method thereof. The hierarchical voltage soft-start circuit comprises a seventh switch tube, an eighth switch tube, a first capacitor, a second capacitor, and a DSP (digital signal processor). A collector of the seventh switch tube is connected with the output end of an anode of a three-phase rectifier bridge and a collector of the eighth switch tube; an emitter of the seventh switch tube is connected with an anode of the first capacitor; an emitter of the eighth switch tube is connected with an anode of the second capacitor and one end of a load; a cathode of the second capacitor is connected with the output end of a cathode of the three-phase rectifier bridge, the other end of the load and a cathode of the first capacitor. The hierarchical voltage soft-start circuit has the advantages that soft starting is achieved by subjecting two ends of the first capacitor to hierarchical voltage charging and starting speed is high.
Owner:SOUTH CHINA UNIV OF TECH

Chargeable cell energy feedback detection device being capable of series connection and parallel connection

The invention provides a chargeable cell energy feedback detection device being capable of series connection and parallel connection, and aims to provide a voltage and current detection circuit used for an energy feedback chargeable cell being capable of series connection and parallel connection. The technical scheme is as follows: the detection device comprises a monitoring host, a one-chip microcomputer, a PWM rectification / inversion circuit and a series-parallel control module. The monitoring host is connected with the one-chip microcomputer through an RS485 communication module. The series-parallel control module is connected with the one-chip microcomputer through a D / A conversion module and a series-parallel controller. Current and voltage signals collected by the series-parallel control module are sent to the one-chip microcomputer via an A / D conversion module. The series-parallel control module is connected with the power grid through the PWM rectification / inversion circuit. The device has beneficial effects that a chargeable cell detection circuit system can be simplified, the system stability is raised, an impact current to charging and discharging of the chargeable cell is eliminated, and the system is controlled by an upper host and the one-chip microcomputer.
Owner:ZAOZHUANG JINWANTONG ELECTRONICS PROD CO LTD

A rectifying and filtering device and method for suppressing power-on surge current

The invention provides a rectification and filtering device for suppressing power-on surge current. The rectification and filtering device comprises a first rectification circuit, a relay, a filtering capacitor and a zero-crossing conduction control circuit for detecting zero crossing points of an alternating current and controlling the relay. The relay comprises a coil and a contact point. A first end of the first rectification circuit is connected with one end of the contact point; the other end of the contact point is connected with one end of the filtering capacitor; the other end of the filtering capacitor and a second end of the first rectification circuit are grounded; the two ends of the coil are connected with the two ends of the zero-crossing conduction control circuit respectively; the other two ends of the zero-crossing conduction control circuit are connected with the two ends of the alternating current respectively; and the other two ends of the zero-crossing conduction control circuit are further connected with a third end and a fourth end of the first rectification circuit respectively. The invention also relates to a method by utilizing the device above. By applying the rectification and filtering device and method for suppressing the power-on surge current, the following beneficial effects can be achieved: the appearance of surge current can be completely eliminated, and hardware cost is reduced.
Owner:SHENZHEN LONGOOD INTELLIGENT ELECTRIC

Double-power-supply switching device control method for inhibiting magnetizing inrush current of load transformer

The invention discloses a double-power-supply switching device control method for inhibiting magnetizing inrush current of a load transformer. The control method is used for switching control of a double-power-supply switching device. The method comprises the following steps of (1) monitoring a power grid power supply, (2) judging whether the power grid power supply has a fault or not, (3) if the power grid power supply fails, stopping the driving signal of the frequently-used power supply switch, (4) detecting whether the frequently-used power switch is turned off or not, and (5) when the frequently-used power supply switch is turned off, turning on the standby power supply switch.
Owner:WUHAN SECOND SHIP DESIGN & RES INST

Multi-port back-to-back type suture-ring-free power conversion device and method

The invention provides a multi-port back-to-back suture-ring-free power conversion device and method, and belongs to the field of low-voltage power distribution network closed-loop power conversion, and the device is specifically characterized in that a series voltage compensator is connected with a parallel converter through a DC coupling capacitor; the two ends of the compensation side of the series voltage compensator are connected with a loop closing switch and a multi-port circuit breaker respectively; the other side of the loop closing switch is connected with the other multi-port circuit breaker; the number of ports of the multi-port circuit breaker is equal to that of the power supplies; the parallel voltage converter is used for maintaining the voltage of the common direct-current bus to be constant and performing harmonic compensation on load current; the alternating current side is connected to a load through an electricity-taking circuit breaker to take electricity; the series voltage compensator is used for providing compensation voltage and adjusting the amplitude and phase of the voltage at the output end of the loop closing switch; and the multi-port circuit breaker provides a plurality of transfer power supply lines for each power supply area. According to the invention, the cost is greatly reduced, the closed-loop power conversion device is simplified, the closed-loop impact current can be eliminated, and the power supply reliability is improved.
Owner:GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD

Adaptive soft-start circuit applied to boost topology switching power supply

InactiveCN106130335BReduce ineffective soft-start timeStart fastPower conversion systemsStart timeControl signal
The invention belongs to the technical field of switching power supply soft start, and provides an adaptive soft start circuit applied to a boost topology switching power supply, which is used to overcome the problem of too long invalid start time of the existing soft start circuit; including a clock module and a zero-crossing detection module , counter module and digital-to-analog conversion module, the clock module generates two clock signals, fast and slow, to input the counter module; the zero-crossing detection module generates a control signal to the counter module according to the size of the energy storage inductor current; the counter module selects the fast clock signal according to the control signal The clock signal or slow clock signal is used as the counting clock to realize counting at different speeds and output binary counting values; the digital-to-analog conversion module converts the binary counting values ​​output by the counter into analog signals, and outputs soft-start reference voltages that rise in steps. The present invention introduces a zero-crossing detection control signal, self-adaptively adjusts the rising rate of the soft-start reference voltage, and greatly shortens the invalid soft-start time of the boost topology switching power supply.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA
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