34results about How to "Achieving Soft Shutdown" patented technology

The invention discloses a boost type converter for realizing high-gain voltage multiplication by coupling inductors, comprising two switching tubes, two clamping diodes, a freewheel diode, an output diode, a clamping capacitor, a voltage-multiplying capacitor, an output capacitor and two coupling inductors respectively provided with two windings. The two coupling inductors are utilized to improve the gain of the converter and reduce the voltage stress of the switching tubes and the diodes in the converter, and the leakage inductance of the coupling inductors is utilized to realize the zero current turn-on of the switching tubes and the soft turn-off of the diodes. A clamping circuit consisting of the clamping diodes and the clamping capacitor absorbs a switching tube turn-off voltage spike caused by the leakage inductance and realizes the lossless transfer of energy. A voltage-multiplying circuit is utilized to further improve the gain of the converter and reduce the voltage stress of the switching tubes and the output diode, and staggered parallel connection is utilized to control and reduce ripple waves of input current.

The invention discloses an intelligent IGBT (insulated gate bipolar transistor) constant-current driving device. The intelligent IGBT constant-current driving device comprises an isolation DC (direct current)-DC module, a PLD (programmable logic device) digital control module, a DAC (digital-to-analog converter) module, a controlled constant-current source, a voltage comparison logic circuit, a gate-level current acquisition circuit and a current comparison logic circuit. A driving power source and a driving signal of a primary side control portion provide an isolated driving power source and a driving signal for a secondary side through the isolation DC-DC module, and an alarming signal of the secondary side provides an isolated alarming signal for the primary side through the isolation DC-DC module. Output ends of the driving signals, the voltage comparison logic circuit and the current comparison logic circuit are connected with an input end of a PLD digital signal, output of PLD is connected with input of the DAC module, outputs of the DAC module and a subtraction circuit are connected with input of the controlled constant-current source, and output of the controlled constant-current source is connected with gate level of IGBT. On the basis of PLD digital control, output of a control circuit can be regulated according to parameter differences of different types of IGBTs to realize optimal control of different series and different types of the IGBTs.

The invention discloses a topological structure of a coupling inductor and voltage doubling circuit combined set-up converter, and belongs to the power electronic technical field. The coupling inductor and voltage doubling circuit combined set-up converter has the high set-up capacity and comprises two controllable power switch tubes, two coupling inductors with two windings, three one-way rectifier diodes, an output diode, a clamping capacitor, two middle energy-storage capacitors and an output filtering capacitor. Output with the high set-up ratio can be achieved through the coupling inductors and a voltage doubling circuit in the coupling inductor and voltage doubling circuit combined set-up converter, the peak voltage stress of the power switch tubes and the diodes can be reduced, meanwhile, zero-current turn-on of the power switch tubes and turn-off of the diodes are achieved through leakage inductance of the coupling inductors, and the coupling inductor and voltage doubling circuit combined set-up converter is suitable for renewable energy electric generation systems such as a standby energy system, a photovoltaic cell and a fuel cell in future, and has the good practical value and the wide popularization prospects.

The invention discloses a motor soft-starting method of a soymilk machine. Controlled silicon is used as a booster that is connected between a power supply and an electric motor; in AC with T period, an AC zero-crossing signal is detected and taken as a sync signal, the conduction angle magnitude is changed in a phase-shift trigger manner, so that the electric motor obtains voltage that varies continuously. The motor soft-starting method really realizes the soft-starting and soft turning-off of the electric motor in the soymilk machine, reduces the impact of sudden increase and sudden decrease of the voltage on the electric motor and a power grid, leads the rotation speed of the electric motor in the soymilk machine to change smoothly when starting or turning off, reduces the impact torque of the electric motor on loaded machinery, increases the operating stability of the soymilk machine, and prolongs the service life of the electric motor.

The invention is a flow measuring and control method for measurable and controllable electromagnetic valves, belonging to the automation technical field. And the invention firstly makes measurable and controllable flow electromagnetic valve, signal processing controller and power switch compose a flow measuring and control system, where the measurable and controllable flow electromagnetic valve transmits pressure difference between upper and lower valve fluids to the pressure input port of a pressure difference sensor so that the fluid pressure difference is converted through the pressure difference sensor into fluid pressure difference electric signal to output to the input end of the signal processing controller, the signal processing controller calculates the current detected flow according to the input fluid pressure difference and the output current of an electrified coil and compares it with the given flow to output control instruction to change the current of the electrified coil so as to control the valve opening and achieve the purpose of flow control. And the invention implements integration of flow measurement and control, and can conveniently control regulating rule of the valve opening by algorithm.

The invention relates to an intelligent electric power regulator and a method for uniformly allocating power. The power regulator comprises a microprocessor, an input device, an output device and a TCP / IP protocol-based bidirectional communication interface, wherein the input device and the output device are connected with the microprocessor; the input device comprises an analogue input interface circuit, a load current detection circuit and a radiator temperature detection circuit; the analogue input interface circuit is connected to an input port and connected with an intelligent instrument; the output device comprises a thyristor and a driving module of the thyristor; the communication interface module comprises an Ethernet controller, a physical layer interface and an optical fiber communication interface; the micro-processor is also connected with a load current detection module and an overload and short circuit protection module; and the power regulator realizes uniform allocation of load power as well as soft start and switch-off functions by adopting a power adjusting algorithm. The power regulator can run alone as well as run together with other power regulators in a network, realize remote communication control and prolong the service life of a heating element, and has a compact structure, low system cost and high control accuracy.

The invention relates to a switch power supply, which comprises a power converting circuit, a PWM (pulse-width modulation) control circuit and a transformer, wherein one end of a primary winding of the transformer is coupled with a positive electrode of the input end of a direct current power supply, the power converting circuit comprises a first switch tube, a second switch tube and a switch tube driving circuit, the switch tube driving circuit comprises a current limiting circuit, a first clamping circuit and a second clamping circuit, two ends of the current limiting circuit are respectively coupled with the positive electrode of the input end of the direct current power supply and is coupled with one end of the first clamping circuit, the other end of the first clamping circuit is coupled with a source electrode of the second switch tube, the second clamping circuit comprises a second diode, a positive electrode and a negative electrode of the second diode are respectively coupled with a source electrode and a grid electrode of the first switch tube, the grid electrode of the first switch tube is coupled with a public joint of the current limiting circuit and the first clamping circuit, a drain electrode of the first switch tube is coupled with the other end of the primary winding, and the source electrode of the first switch tube is coupled with a drain electrode of the second switch tube. A grid electrode of the second switch tube is coupled with the output end of the PWM control circuit, and the source electrode of the second switch tube is grounded. Two switch tubes are adopted for series connection, so the switch power supply can normally work under the wide input voltage condition.

The invention discloses a high-gain active lossless clamping converter including a built-in transformer and a voltage-multiplying structure. The high-gain active lossless clamping converter comprises one input inductor, one power switch tube, one clamping switch tube, two voltage-multiplying diodes, two output diodes, one clamping capacitor, one DC (Direct Current) blocking capacitor, two voltage-multiplying capacitors, two output capacitors and the built-in transformer, wherein the built-in transformer is provided with two windings. According to the high-gain active lossless clamping converter disclosed by the invention, the built-in transformer is utilized for expanding the voltage gain of the high-gain active lossless clamping converter and reducing the voltage stress of the power switch tube, the leakage inductance of the built-in transformer is utilized for realizing zero-voltage switching of the switch tubes and restraining inverse restoring current of the diodes, a clamping circuit formed by the clamping switch tube and the clamping capacitor is capable of effectively absorbing the voltage spike when the power switch tube is switched off and realizing the lossless transfer of energy, a voltage-multiplying circuit structure is utilized for further increasing the gain of the high-gain active lossless clamping converter and further reducing the voltage stress of the power switch tube and the diodes, the circuit structure is simple, the control is convenient, and the high-gain active lossless clamping converter is suitable for a photovoltaic grid-connected power generation conversion occasion in small power, high gain and high efficiency.

The invention discloses a Boost converter with a built-in transformer and a voltage-doubling unit of a switching capacitor, which comprises a power switching tube, an input filtering inductor, a blocking capacitor, a clamping diode, a clamping capacitor, a fly-wheel diode, the switching capacitor, an output diode, an output capacitor and a built-in transformer with two windings. The leakage inductance of the built-in transformer is utilized for realizing zero-current switching-on of the power switching tube and eliminating the backward recovery problem of the output diode and the clamping diode, a passive clamping circuit comprising the clamping diode and the clamping capacitor is utilized for realizing soft switching-off of the power switching tube and non-loss transfer of leakage inductance energy, the leakage inductance and resonance of the blocking capacitor are utilized for eliminating the backward recovery problem of the fly-wheel diode, the voltage-doubling unit comprising the built-in transformer and the blocking capacitor is utilized for realizing high-gain output of the converter and reducing the voltage stress of a power device, an additional power switch is not required, no energy loss elements exist in a circuit, and the structure is simple.

The invention relates to a power factor corrector realized in an intelligent embedded way and a control method thereof. The power factor corrector comprises a PFC (Power Factor Correction) processor with an embedded chip as core, a full wave rectifying circuit, an overcurrent protection circuit, a double-limiting voltage control circuit, a DC / DC (Direct Current / Direct Current) conversion circuit, an inductor L, a diode D, a capacitor C and a power switch tube Q. The power factor corrector realized in the intelligent embedded way, provided by the invention, has the advantages as follows: 1) duty cycle is directly stored in a chip in the form of data so as to output a PWM (Pulse Width Modulation) control wave, so that the traditional feedback circuit method is saved, a circuit structure is simplified, the usage of components is reduced and the processing process is simple and convenient; 2) the processor can be used for adjusting programs according to actual requirements in real time without frequently modifying hardware; 3) a voltage constant output function is achieved and load requirements are satisfied; 4) a remote control voltage regulating function is achieved, so that greater convenience for user in use is achieved; 5) soft startup and soft shutdown of a circuit are achieved and a circuit component is protected; and 6) overcurrent protection is achieved so that the safety of the circuit is ensured.

The invention discloses a boost type converter for realizing high-gain voltage multiplication by coupling inductors, comprising two switching tubes, two clamping diodes, a freewheel diode, an output diode, a clamping capacitor, a voltage-multiplying capacitor, an output capacitor and two coupling inductors respectively provided with two windings. The two coupling inductors are utilized to improve the gain of the converter and reduce the voltage stress of the switching tubes and the diodes in the converter, and the leakage inductance of the coupling inductors is utilized to realize the zero current turn-on of the switching tubes and the soft turn-off of the diodes. A clamping circuit consisting of the clamping diodes and the clamping capacitor absorbs a switching tube turn-off voltage spike caused by the leakage inductance and realizes the lossless transfer of energy. A voltage-multiplying circuit is utilized to further improve the gain of the converter and reduce the voltage stress of the switching tubes and the output diode, and staggered parallel connection is utilized to control and reduce ripple waves of input current.

The invention discloses a high step-up ratio converter for a DC (Direct Current) module on the basis of coupled inductors, which comprises two main switching tubes, two clamping switching tubes, two freewheel diodes, two output diodes, two clamping capacitors, two voltage-multiplying capacitors, an output capacitor and tow coupled inductors each of which is respectively provided with two windings. According to the invention, a voltage gain of the converter is expanded and voltage stresses of the power switching tubes and the diodes are reduced by the coupled inductors; the leakage inductances of the coupled inductors are utilized to implement zero voltage switching of the switching tubes and inhibit reverse recovery currents of the diodes; a clamping circuit consisting of the clamping switching tubes and the clamping capacitors effectively adsorbs a voltage spike when the power switching tubes are switched on and switched off and implements lossless transfer of energy; a coupled inductor series circuit is utilized to further improve the gain of the converter and further reduce the voltage stresses of the power switching tubes and the output diodes; the high step-up ratio converter has a simple circuit structure, is convenient to control and is suitable for the high-gain and high-efficiency grid-connected photovoltaic power generation transformation place.

The invention discloses a high-gain active lossless clamping interleaving converter with an internal transformer and a voltage-multiplying structure. The high-gain active lossless clamping interleaving converter comprises two input inductors, two power switching tubes, two clamping switching tubes, two voltage-multiplying diodes, two output diodes, two clamping capacitors, two voltage-multiplying capacitors, two output capacitors and one internal transformer with three windings. According to the invention, a voltage gain of the converter is expanded and voltage stresses of the power switching tubes and the diodes are reduced by the internal transformer; the leakage inductance of the internal transformer is utilized to implement zero voltage switching of the switching tubes and inhibit reverse recovery currents of the diodes; a clamping circuit consisting of the clamping switching tubes and the clamping capacitors effectively adsorbs a voltage spike when the power switching tubes are switched on and switched off and implements lossless transfer of energy; the voltage-multiplying circuit structure is utilized to further improve the gain of the converter and further reduce the voltage stresses of the power switching tubes and the diodes; the high-gain active lossless clamping interleaving converter has a simple circuit structure, is convenient to control and is suitable for the high-gain and high-efficiency grid-connected photovoltaic power generation transformation place.

The invention relates to a single-phase X-shaped staggering three-level AC voltage regulating circuit including a main circuit part and a switch tube protection part. The main circuit part includes a power source Ui, an inductor Li, an inductor Lo, a capacitor C1, a capacitor C2, a capacitor C, an IGBT switch tube S1, an IGBT switch tube S2, an IGBT switch tube S3, an IGBT switch tube S4, an IGBT switch tube S5, an IGBT switch tube S6, a diode D1, a diode D2, a diode D3, a diode D4, a diode D01, a diode D02, a diode D03, a diode D04, a diode D05, a diode D06, a diode D07, a diode D08 and a resistor R. The switch tube protection part includes an inductor Lr, a capacitor Cr and a capacitor CS. The quantity of involved components and parts is small and the cost is low. The structure of the voltage regulating conversion circuit is simple. Reverse phase voltage adjustment of input and output can be realized. The circuit provided by the invention has advantages of single-stage conversion, small quantity of output voltage harmonics, low voltage stress and large output voltage regulation range.

The present invention discloses a three-phase inverter short-circuit fault detection method. The method comprises: collecting a line voltage in a three-phase inverter and converting the line voltage into a phase voltage; performing DQ decoupling processing on the line voltage and the phase voltage to obtain active component detection values, reactive component detection values, and zero sequence component detection values respectively corresponding to the line voltage and the phase voltage; setting active component standard values, reactive component standard values, and zero sequence component standard values respectively corresponding to the line voltage and the phase voltage during the normal operation of the three-phase inverter according to the specific inverter; comparing the detection values corresponding to the line voltage with the corresponding standard values, and the detection values corresponding to the phase voltage with the corresponding standard values, and determining whether there is a fault to the three-phase inverter according to the comparison results; if there is no fault, allowing the three-phase inverter to continue to operate; if there is a fault, determining a fault occurrence position according to the phase voltage and the line voltage and the corresponding detection values; and according to the fault occurrence position, executing pulse blocking protection on the switch or disconnecting a main contactor to stop the inverter operation, and ending the test.

A dual-unit step-up type soft switch converter is composed of two powr diodes, two resonance circuits, and an auxilairy switch. The soft cut-off of auxiliary switch, the soft on-off of power diode and zero-current cut-off of output rectifying diode are realized on the basis that two resonance capacitors whose voltage can not change suddenly and used.

Embodiments of the invention disclose an overtemperature protection circuit and a driving method. The overtemperature protection circuit comprises a constant current source circuit, a comparator circuit and an output circuit, wherein the comparator circuit comprises a negative temperature coefficient resistor, a first resistor and a voltage comparator; the comparator circuit compares a first voltage end at the first input end and a second voltage value at the second input end, and outputs a control signal according to a comparison result, wherein when the temperature is greater than or equal to a protection threshold value, the control signal is an overtemperature control signal; and the output circuit is used for outputting a switch-off enabling signal when the comparator circuit outputs the overtemperature control signal. By virtue of the scheme provided by the embodiment, a device can be switched off in time at an overhigh temperature so as to protect the device.

The invention discloses a multi-stage grid voltage reduction SiC-MOSFET drive circuit, including a short-circuit detection circuit, a turn-off logic control circuit, a totem pole circuit, a first-stage grid voltage reduction circuit, and a second gate voltage reduction soft-off circuit The short-circuit detection circuit judges the short-circuit peak current to detect the real occurrence of a short-circuit fault, and the first-stage gate voltage reduction circuit reduces and maintains the SiC-MOSFET gate voltage to the maximum short-circuit withstand time, improving the short-circuit ride-through capability of the device; through the second-stage reduction The gate voltage circuit further reduces the gate voltage to achieve soft turn-off, thereby suppressing the turn-off voltage spike. The invention ensures that the SiC-MOSFET is safely turned off under short-circuit conditions, effectively increases its short-circuit withstand time, and improves the fault ride-through capability.

The invention discloses a Buck soft switching circuit for supercapacitor charging, comprising a Buck circuit composed of an input voltage source Vh, an output voltage source Vl, a main inductance Lm, a main switching tube S2, and a main diode D1, and the output voltage source Vl A first capacitor C1 is connected between the negative electrode and the collector of the main switching tube S2, a main diode D1 is connected in parallel between the two ends of the main inductance Lm and the output voltage source V1, the collector of the main switching tube S2 and the first auxiliary switching tube Sa2 Collector connection, resonant capacitor Cr is connected between the emitter of the main switching tube S2 and the emitter of the first auxiliary switching tube Sa2, and the emitter of the first auxiliary switching tube Sa2 is also connected with the collector of the second auxiliary switching tube Sa3 , the emitter of the second auxiliary switching transistor Sa3 is connected to the resonant inductor Lr and the first auxiliary diode Da1, and the resonant inductor Lr and the first auxiliary diode Da1 are connected in series and then connected in parallel with the main diode D1. The invention also discloses a control method for the Buck soft switch circuit for accumulator charging. The soft switching circuit of the present invention reduces switching loss.

The invention discloses an intelligent IGBT constant current drive device, which comprises an isolated DC-DC module, a PLD digital control module, a DAC digital-to-analog conversion module, a controlled constant current source, a voltage comparison logic circuit, a gate-level current acquisition circuit and Current comparison logic circuit. The driving power and driving signal of the primary side control part provide isolated driving power and driving signal for the secondary side through the isolated DC-DC module, and the alarm signal of the secondary side provides an isolated alarm signal for the primary side through the isolated DC-DC module; The output terminals of the driving signal, the voltage comparison logic circuit and the current comparison logic circuit are connected to the input terminal of the PLD digital signal, the output of the PLD is connected to the input of the DAC digital-to-analog conversion module, and the output of the DAC digital-to-analog conversion module and the subtraction circuit is connected to the controlled constant The input of the current source is connected, and the output of the controlled constant current source is connected to the gate level of the IGBT through the driving resistor Rg. The device of the present invention takes PLD digital control as the core, and can adjust the output of the control loop according to the difference in parameters of different types of IGBTs, so as to realize the optimal control of different series and types of IGBTs.

The embodiment of the invention discloses an over-temperature protection circuit and a driving method. The circuit includes: a constant current source circuit, a comparator circuit and an output circuit, the comparator circuit includes a negative temperature coefficient resistor, a first resistor and a voltage comparator, and the comparator circuit compares the first input terminal A voltage and the value of the second voltage at the second input terminal, and output a control signal according to the comparison result, wherein the control signal is an over-temperature control signal when the temperature is greater than or equal to the protection threshold; the output circuit is used for the When the comparator circuit outputs the over-temperature control signal, it outputs a shutdown enable signal. The solution provided by the embodiment of the present invention can shut down the device in time to protect the device when the temperature is too high.

The invention belongs to the technical field of power supplies and particularly relates to a lithium battery charging or discharging management circuit and a lithium battery management system. The lithium battery charging or discharging management circuit comprises a lithium battery, a control module, a main switch module, a limiting switch module, a sampling resistor and a short-circuit detection module. The main switch module and the limiting switch module are jointly connected to the output end of a capacitive load, and the input end of the capacitive load is connected with the positive electrode of the lithium battery. The main switch module, the limiting switch module and the short-circuit detection module are jointly connected to the first end of the sampling resistor, and the second end of the sampling resistor is connected with the negative electrode of the lithium battery; the control module is connected with the main switch module, the limiting switch module, the lithium battery and the short-circuit detection module to carry out detection or control. Because the switch-on and switch-off of the main switch module and the switch-on and switch-off of the limiting switch module can be controlled by the control module according to the state of a circuit, false triggering of short-circuit protection is avoided, and a capacitive load with a large capacitance value can be switched on normally.

The invention relates to a driving voltage regulating circuit, a driving circuit and a driving method of a power electronic device. The driving voltage regulating circuit comprises a time constant regulating circuit and a pulse modulation control circuit, wherein the pulse modulation control circuit is used for outputting a pulse signal to the power supply circuit, and the pulse signal is used for driving the power supply circuit to output a driving signal to the time constant adjusting circuit; slopes of a driving signal level rising edge and a driving signal level falling edge are adjusted through a time constant adjusting circuit so as to output a driving level with a voltage value slowly changing at the driving signal level rising edge or the driving signal level falling edge, and on or off of a power electronic device is controlled through the driving level. Soft turn-on and soft turn-off are realized based on the driving voltage adjusting circuit and the driving circuit, so that a peak voltage value is effectively reduced, a power electronic device is prevented from being broken down by peak voltage high voltage, and the reliability of an electronic product is improved.

The invention relates to the technical field of circuits, in particularly to an interlaced on-line isolated double-cuk circuit. The interlaced on-line isolated double-cuk circuit comprises a first diode (D1), a second diode (D2), a first energy-storage inductor (L1), a second energy-storage inductor (L2), a third energy-storage inductor (L3), a fourth energy-storage inductor (L4), a first capacitor (C1), a second capacitor (C2), a first switching device MOS (metal oxide semiconductor) (Q1) and a second switching device MOS (Q2); the interlaced on-line isolated double-cuk circuit is also characterized by comprising at least a rectifier bridge, and at least two diodes and at least a capacitor are arranged between a positive output end V+ and a negative output end V- of a power supply. The invention provides an interlaced on-line isolated double-cuk circuit which has a simple structure and is convenient to operate and control.

The invention discloses a high step-up-ratio converter in bidirectional voltage outputting for a photovoltaic module. The high step-up-ratio converter comprises two switch tubes, two clamping diodes, two fly-wheel diodes, two output diodes, two clamping capacitors, one voltage-multiplying capacitor, two output capacitors and two coupling inductors, wherein the two coupling inductors are provided with two windings. According to the high step-up ratio converter disclosed by the invention, the coupling inductors are utilized for expanding the voltage gain of the high step-up-ratio converter and reducing the voltage stress of power switch tubes and the diodes, the leakage inductance of the coupling inductors is utilized for realizing zero-current switching of the switch tubes and restraining inverse restoring current of the diodes, a clamping circuit formed by the clamping diodes and the clamping capacitors is capable of effectively absorbing the voltage spike when a main switch tube is switched off and realizing the lossless transfer of energy, a voltage-multiply circuit is utilized for further increasing the gain of the high step-up-ratio converter and further reducing the voltage stress of the power switch tubes and the output diodes, the circuit control is convenient, the ripple of the input current is small, and the high step-up ratio converter is suitable for a photovoltaic grid-connected power generation conversion occasion in larger power, high gain and high efficiency.

The invention discloses a short-circuit fault detection method of a three-phase inverter, which comprises collecting the line voltage in the three-phase inverter and converting the line voltage into a phase voltage; performing DQ decoupling processing on the line voltage and the phase voltage , get the active component detection value, reactive component detection value and zero-sequence component detection value corresponding to the line voltage and phase voltage respectively; Active component standard value, reactive component standard value and zero-sequence component standard value; compare the detection value and standard value corresponding to the line voltage and the corresponding detection value and standard value of the phase voltage, and determine whether the three-phase inverter is faulty according to the comparison result ; If no fault occurs, the three-phase inverter continues to run; if a fault occurs, the location of the fault is determined according to the phase voltage and line voltage and their corresponding detection values; according to the location of the fault, the pulse blockade protection of the switch is executed Or disconnect the main contactor to stop the inverter operation and end the detection.