23results about How to "Suppress surge current" patented technology

The invention provides a slow power-on circuit for a servo system. The slow power-on circuit comprises a control power supply module, a BUCK converter module, a PWM generator module, a state display module and a totem pole driving module. A BUCK converter is connected in series between main power loops, the magnitude of surge current is determined by the peak value of inductive current, and the increase of voltage on a capacitor is realized by controlling the duty ratio of an MOSFET (Metal-Oxide-Semiconductor Field Effect Transistor). The high-frequency inductor is adopted to suppress surge current, so that space is saved, and the energy utilization rate is increased; the voltage at the two ends of the load capacitor is gradually increased by adopting a method for adjusting the duty ratio to be gradually increased, and universality is achieved; the peak value of the input current is effectively reduced in a duty ratio chopping mode, and the time required by the slow power-on process is shortened; whether a fault occurs in the slow power-on process or not is judged according to the light emitting condition of the light-emitting diode.

The utility model discloses a surge current suppression interface circuit for an automobile LED module. The surge current suppression interface circuit for the automobile LED module comprises an input protection circuit unit, an MOS tube slow start circuit unit and a pi-type filter circuit unit which are arranged between an input end and an output end, the MOS tube slow starting circuit unit comprises an MOS tube, a charging capacitor used for controlling slow starting of the MOS tube and a resistor connected with the charging capacitor, the resistor is connected with the input protection circuit unit, the two ends of the charging capacitor are connected with the G pole and the S pole of the MOS tube respectively, the G pole of the MOS tube is connected with the resistor, the S pole and the D pole of the MOS tube are connected with the input end and the output end respectively, and the input end is connected with the input protection circuit unit. And the on-off of the input end and the output end is controlled. The surge suppression circuit is simple in circuit structure, low in cost, capable of reliably suppressing surge current in use, and low in overall size requirement.

The invention provides a surge eliminating circuit capable of being used for a satellite-borne refrigerator power supply input port. A carrier wave generating circuit generates a fixed-frequency periodic carrier wave; the modulating wave generating circuit generates output voltage which rises according to an exponential rule through charging and discharging and serves as a modulating wave. The comparison driving circuit compares the periodic carrier waves with the modulation waves rising according to the exponential law to generate a pulse sequence with the duty ratio gradually increased, the pulse sequence is applied to a grid electrode of the surge suppression MOS tube, and then the surge suppression MOS tube is controlled to slowly charge an L-C array at the rear stage of a satellite-borne refrigerator power supply. According to the invention, the surge current at the start-up moment can be suppressed, and the surge current impact of the L-C array on the bus at the start-up moment is reduced to the greatest extent.

This invention discloses a boost DC bus voltage matching system for a motor inverter with dual high-voltage battery packs, comprising a battery management system, battery pack A, battery pack B, main negative contactor R2, main positive contactor R3, main negative contactor R4, a first voltage sensor, a first current sensor, a second voltage sensor, a second current sensor, a third voltage sensor, a vehicle control unit, a generator control module, an inverter, a generator, a relay Rb, current sensors a1, b1, and c1, a DC link capacitor bank CDC, a power inverter module, a motor controller, current sensors a2, b2, and c2, and a traction motor. The invention features a highly integrated hardware architecture, effectively reducing system cost and space occupation, enabling seamless battery pack switching during driving, effectively suppressing surge current, protecting high-voltage components and ensuring power stability, improving system fault tolerance, and enhancing the operational reliability of the high-voltage system.

The present invention improves the image quality of image data in a solid-state imaging element using a comparator. The solid-state imaging element is equipped with a current source, a pixel circuit, a comparison circuit, a control unit and a counter. The current source generates a constant current. The pixel circuit generates a pixel signal having a voltage higher than a predetermined lower limit voltage corresponding to the conductance of the current source. The comparison circuit amplifies the pixel signal at a predetermined amplification factor and compares it with a predetermined reference signal. When the amplification factor increases, the control unit reduces the conductance. The counter counts and outputs the count value throughout a period of time that lasts until the comparison result from the comparison circuit is inverted.

The utility model discloses a bus pre-charging circuit and a power supply system. The bus pre-charging circuit comprises a signal input module, the input end of which is used for receiving a bus pre-charging control signal, and the signal input module is used for outputting a corresponding current signal according to the bus pre-charging control signal; the flyback control module is connected with the output end of the signal input module, and the flyback control module is used for outputting a PWM signal according to the current signal; the isolation transformer module is connected with an input power supply, and the isolation transformer module is used for being connected to a bus to be pre-charged; and the pre-charging PWM driving module is respectively connected with the PWM signal output end of the flyback control module and the isolation transformer module, and the pre-charging PWM driving module is used for controlling the on-off of an internal switching tube according to the PWM signal. According to the utility model, the bus pre-charging circuit is arranged to charge the capacitor on the bus in advance, thereby effectively suppressing the surge impact when the subsequent main power circuit is powered on.

The utility model provides a high-power LED light source driving circuit, which comprises a direct-current power supply, an LED driver, a charging control circuit, a current sampling resistor, a capacitor bank and a discharging control circuit, a direct-current power supply is input to the LED driver, and the LED driver is connected with the current sampling resistor and the capacitor bank in series. The capacitor bank is connected with the anode of the LED light source; the charging control circuit comprises a voltage division circuit I and a voltage comparator I, and the voltage division circuit I samples the voltage output by the LED driver; the voltage comparator I is connected with the LED driver; the LED driver judges whether the capacitor bank is charged or not; the discharge control circuit comprises a controller and a switching device, the switching device is connected to the controller, and the controller controls on and off of the switching device; when the switching device is switched on, the capacitor bank releases electricity to the light source, and the light source is turned on; large current is provided for the light source through energy storage of the capacitor bank, smooth starting of the large-power light source is guaranteed, and the problems of power consumption increase and transmission cable heating are avoided.

The invention discloses a current surge control device and power starting equipment with a surge suppression function. The power starting equipment comprises a power supply device and the current surge control device. The power supply device generates an alternating current signal which changes periodically. The current surge control device comprises a rectifier, a voltage detector, a time sequence control module and a switching device. The rectifier rectifies the AC signal to generate a rectified voltage. The voltage detector generates a trigger signal according to a magnitude relationship between a voltage value of the rectified voltage and a critical voltage. The sequential control module generates a starting signal with a rising positive edge corresponding to a voltage zero point of the AC signal according to the trigger signal, and the switching device receives the AC signal and generates an output voltage according to the starting signal. The voltage detector enables the time sequence control module to generate a starting signal at the time point when the voltage of the alternating current signal is zero according to the relation between the divided voltage and the critical voltage so as to start the switching device, and therefore the effect of restraining the surge current is achieved.

The invention relates to a soft start and overcurrent protection system and module for a magnetic drive conveying line and a control method. The system mainly comprises a soft start and overcurrent protection module, and the soft start and overcurrent protection module is connected in series between a switching power supply and a magnetic drive line driver. The soft start and overcurrent protection module comprises a main power module, a sampling and processing module, a control logic module and a state indication module, and the control logic module is respectively connected with the main power module, the sampling and processing module and the state indication module. Surge current of parallel power-on of multiple drivers is effectively suppressed, impact on a switching power supply and a capacitor is reduced, and the service life of key components of a system is prolonged.

The application relates to the technical field of tube control, and discloses a filament controller for a power tube, a control system and a power supply regulation method, which comprises a first input switching module, a programmable control module, a first output switching module and a power regulation module; the first input switching module is used for receiving and converting external on-off signals and analog signals; the programmable control module is used for receiving signals and generating regulation instruction signals based on internal preset control logic; the first output switching module is used for receiving and converting the regulation instruction signals; the power regulation module is used for receiving the converted regulation instruction signals and outputting a power supply voltage to a filament power supply loop; wherein the power regulation module adjusts the conduction angle of internal power devices based on the regulation instruction signals to change the conduction duration in an alternating voltage half cycle, thereby regulating the effective value of the power supply voltage. The application can realize continuous control of the power supply voltage and reduce filament damage.

The invention discloses a new energy hydrogen production power supply modularization control method, and belongs to the technical field of new energy hydrogen production. The control method comprises the following steps: firstly, determining a voltage reference value of a next switching period by judging a voltage reference initial value and an actual voltage sampling value; through dynamic design of a starting voltage reference value curve, modular parallel synchronous starting of a new energy hydrogen production power supply without a communication line is realized, and meanwhile, the problem of current surge in the system starting process is inhibited. According to the invention, the problem of asynchronous parallel starting of the new energy hydrogen production power supply modularization can be effectively solved, the dynamic ring current generated during parallel operation is reduced, the current surge problem in the system starting process is inhibited, and the transient performance and the stability of the new energy hydrogen production power supply modularization parallel system are further improved.

The application discloses a phase change memory and a control method thereof, and belongs to the technical field of memories. The phase change memory comprises a plurality of local word lines and a plurality of local bit lines; a storage unit array comprising a plurality of array-arranged storage units, each storage unit being coupled between a local word line and a local bit line; a plurality of storage units comprising a target storage unit; a first current mirror structure coupled to the target storage unit through a local bit line; and a second current mirror structure coupled to the target storage unit through a local bit line. The first current mirror structure is configured to apply a first current signal to the target storage unit in a first time period; the first current signal is greater than a holding current of the target storage unit. The second current mirror structure is configured to apply a second current signal to the target storage unit in a second time period; the second current signal is greater than the first current signal. The above scheme can reduce the inrush current during the RESET operation.

This invention relates to a bridgeless PFC circuit structure and power supply device. The circuit includes a first switching transistor, a first energy storage inductor, a first EC charging module, a second EC charging module, and a charging control module. One end of the first energy storage inductor is connected to the live wire terminal of the power supply device, one end of the first EC charging module, and one end of the second EC charging module. The other end of the first energy storage inductor is connected to the first terminal of the first switching transistor, the other end of the first EC charging module, and the other end of the second EC charging module. The second terminal of the first switching transistor is connected to the neutral wire terminal of the power supply device. The charging control module is connected to the third terminal of the first switching transistor, the first EC charging module, and the second EC charging module, respectively, to control the conduction or cutoff of the first switching transistor, the first EC charging module, and the second EC charging module. This reduces circuit losses caused by the rectifier bridge, improves circuit efficiency, and reduces circuit size.

A power supply device includes an input terminal, a power conversion module, and an inductor. The input terminal is connected to a power supply bus to receive an input voltage. The power conversion module includes a port proximate to the input terminal, and the port exhibits capacitive impedance characteristics. The inductor is connected in series between the input terminal and the port of the power conversion module. When the input terminal is connected to the power supply bus, a surge current flowing into the power conversion module is suppressed by the inductor.

The invention belongs to the technical field of electronic circuits, and particularly relates to a voltage feedback type controllable time constant capacitor charging circuit based on a PMOS (P-channel Metal Oxide Semiconductor) switch. Comprising a PMOS switch circuit, an ideal diode is formed by two PMOS switch tubes Q1 to Q2 in a back-to-back mode, the drain electrode of the PMOS switch tube Q1 is connected to a power supply bus, the drain electrode of the PMOS switch tube Q2 is connected to the positive electrode of an energy storage capacitor bank, and an optocoupler N1 receives a PWM signal from an FPGA to control the grid potential of the PMOS switch tube Q2; the voltage sampling feedback circuit comprises an isolation type delta-sigma modulator GLa3316; the PWM generation circuit comprises an FPGA (Field Programmable Gate Array); and the soft start control circuit prestores a soft start control program, and dynamically generates and outputs a PWM control signal with an adjustable duty ratio through a PWM generator in the soft start control circuit according to the real-time voltage value transmitted by the voltage sampling feedback circuit and a preset soft start curve. The circuit aims at achieving linear and programmable control over the charging process of the high-capacity energy storage capacitor and effectively restraining the power-on surge current.

The utility model relates to a coating coil transmitting module, which comprises a coil body, a parylene coating is arranged on the surface of the coil body, and coil pins extending outwards are arranged at two ends of the coil body; the large magnetic sheet is arranged at one end of the coil body and completely covers the coil body; the small magnetic sheet is arranged in the center of the coil body and is connected with the large magnetic sheet; and the NTC thermistor is arranged in the center of the coil body and is connected with the large magnetic sheet, and the NTC thermistor is connected with a resistor pin extending outwards. The parylene plating layer is arranged on the periphery of the coil body of the transmitting module, a sealing film layer is formed on the surface of the coil body, saline pinholes in the surface of the coil are subsequently tested to be OPCS, the surface of the coil achieves an insulation effect, water operation can be achieved, and the transmitting module is suitable for outdoor electronic products such as an unmanned aerial vehicle charging station. And meanwhile, the NTC thermistor is arranged, so that the temperature of the coil is monitored in real time so as to be convenient to control.

The utility model discloses a power supply system with a power-on over-current protection circuit and an air conditioning system, and the power supply system with the power-on over-current protection circuit comprises a power factor correction circuit and a bus capacitor which are carried on a live wire and a zero wire which are used for providing electric energy. The power factor correction circuit is used for adjusting the voltage on the live wire and supplying power to the bus capacitor, and the bus capacitor can supply power to a load connected with the bus capacitor. The thermistor and the power factor correction circuit are connected in series on the live wire together, the voltage detection circuit is used for detecting electrical parameters on the live wire, and the switch control circuit is used for adjusting the access state of the thermistor according to the electrical parameters. Compared with the prior art, the circuit can accurately control the connection and disconnection of the thermistor, thereby solving the problem that a unit is shut down due to faults when the power-on interval is short.

The application discloses a control assembly and a server, relates to the technical field of circuits, and can realize power control of a plurality of disks and a single disk of a server system through timing control of a backboard controller, and reduces hardware cost; the control assembly comprises a backboard controller, a switch unit, a plurality of hard disk connectors and a plurality of hard disks; a power supply end of the backboard controller is electrically connected with a first power supply end, a control end of the backboard controller is connected with an enable end of the switch unit, and one output end of the backboard controller is connected with an input end of one hard disk connector; an input end of the switch unit is electrically connected with a second power supply end, and an output end of the switch unit is used for connecting a power supply end of the hard disk; at least two output ends of the hard disk connector are used for respectively connecting a power supply end and a control end of the hard disk; the backboard controller is configured to output a first control signal through the control end to control the switch unit to be turned on, and output a second control signal to the hard disk connector through the output end to control power-on and power-off of the hard disk.

The invention relates to a protection circuit, a drive control device and a vehicle. The protection circuit comprises: a first thermistor having a negative temperature coefficient; the second thermistor has a positive temperature coefficient; wherein the first thermistor and the second thermistor are connected in series to form a series branch, and the series branch is connected in series with a power supply path of a circuit to be protected; the switch module is connected with the series branch in parallel, the switch module is connected with the to-be-protected circuit, and the switch module is used for selecting the short-circuited series branch according to a control signal output by the to-be-protected circuit; wherein the series branch circuit is used for reducing surge current on the power supply access circuit under the condition that the circuit to be protected is powered on through the power supply access circuit and the series branch circuit is not short-circuited by the switch module. The protection circuit provided by the invention can restrain surge current.

This invention discloses a power-type composite thermistor for suppressing surge current, comprising an NTC thermistor chip and a PTC thermistor chip encapsulated in a resin layer with their two electrodes in contact. A common pin is fixed to the contact electrode of the NTC and PTC thermistor chips, and NTC and PTC thermistor pins are fixed to the non-contact electrode of the NTC and PTC thermistor chips, respectively. The contact NTC and PTC thermistor chips are connected in parallel in a circuit for suppressing surge current. This invention uses a soldered encapsulation method, facilitating mass production, and offers advantages such as low-temperature start-up, surge suppression, and adaptability to frequent power-on / off cycles. Its novel structure has promising application prospects.

This application discloses a power supply circuit and system, and a mobile device, belonging to the field of electronic technology. The circuit includes a pre-charging unit and multiple power distribution branches. The positive input terminal of each power distribution branch is connected to the input terminal of the pre-charging unit, and the positive output terminal of each power distribution branch is connected to the respective output terminal of the pre-charging unit. The input terminal of the pre-charging unit is also used to connect to the positive power supply terminal of a power source, and the positive output terminals of each power distribution branch are used to connect to loads. The pre-charging unit outputs pre-charge energy to the target load when pre-charging is required for the target load corresponding to the target power distribution branch. The target power distribution branch remains off when the voltage corresponding to the target load is less than a preset threshold, and turns on when the voltage of the target load is greater than or equal to the preset threshold, to supply power to the target load. This application can effectively suppress surge currents or inrush currents that may occur when capacitive loads are powered on, thereby improving the safety and reliability of power supply.

The invention provides a novel AC / DC converter surge current suppression method and system, and the method specifically comprises the steps: S1, detecting whether the dv / dt control of a switch capacitor valve is enabled or not, and whether the power protection control of a novel switch valve is enabled or not; s2, if the dv / dt control of the switched capacitor valve is enabled, executing the dv / dt control of the switched capacitor valve; if the novel switch valve power protection control is enabled, the novel switch valve power protection control is executed; s3, if a shutdown instruction of the converter is received, ending the method; otherwise, skipping to the step S1. According to the invention, the surge current generated by charging the novel switch valve by the switch capacitor valve due to the rise of the output voltage of the switch capacitor valve can be obviously suppressed, so that circuit components are protected from being damaged.

This application discloses a DC high-voltage power supply, relating to the field of DC high-voltage line power extraction technology, including a high-voltage input circuit, a control chip, a drive circuit, a first start-up circuit, and a second start-up circuit. The first start-up circuit includes a first current-limiting circuit and a monitoring circuit. The monitoring circuit is connected to the power supply terminal of the control chip and is used to detect its voltage and output the voltage divider point voltage. The second start-up circuit includes a second current-limiting circuit, a controllable switch circuit, and an energy storage circuit. The controllable switch circuit is connected in series between the second current-limiting circuit and the energy storage circuit, and its controlled terminal is connected to the output terminal of the monitoring circuit. The controllable switch circuit conducts the second current-limiting circuit and the energy storage circuit when the voltage divider point voltage is reached; otherwise, it disconnects them. This application uses the monitoring circuit to detect the power supply voltage of the control chip in real time and utilizes the controllable switch circuit to achieve sequential conduction of the two start-up circuits, eliminating the surge current generated by simultaneous conduction of two circuits in the prior art.