43results about How to "Suppression of spike voltage" patented technology

The invention discloses a thick-film magnetic isolation direct current solid-state power controller which comprises a power MOSFET (metal oxide semiconductor field effect transistor), a detection resistor, a power diode, a TVS (transient voltage suppressor) diode, a current conditioning circuit, a voltage detection circuit, a voltage state judgment circuit, a current state judgment circuit, an immediate trip circuit, an inverse time circuit, a short-circuit detection circuit, a driving circuit, a state synthetic circuit, a trip state latch circuit, a time delay reset circuit, a time sequence matching circuit, a DC/DC (direct current/direct current) isolated power supply, a first isolation circuit, a second isolation circuit, a third isolation circuit, a state feedback interface circuit, a control signal interface circuit and a power-on reset circuit. The circuit structure can optimize the electrical properties of the controller, reduce the volume and the weight, improve the reliability and is widely applied to civil low-voltage direct current power distribution systems, aviation, aerospace, tanks, automobiles, ships and other fields.

The invention provides a band-gap reference circuit. The band-gap reference circuit comprises a band-gap core unit, a starting unit, an output unit and a clamping unit, wherein the starting unit comprises a first PMOS tube, a first resistor, a first NMOS tube and a circuit mirror unit; the clamping unit is applicable to conduct clamping on a grid electrode of the first NMOS tube. According to the technical scheme, the reference voltage provided by the band-gap reference circuit is small in overshoot when being started and improves the reliability of a circuit system.

The invention discloses a high-gain and wide-duty cycle control Boost converter and belongs to the technical field of converters. The high-gain and wide-duty cycle control Boost converter disclosed bythe invention is characterized in that a clamping absorption unit 1 is composed of a clamping diode D1 and a clamping capacitor C1; a clamping absorption unit 2 is composed of a clamping diode D2 anda clamping capacitor C2; a pressure doubling unit 1 is composed of a capacitor C3, a diode D3 and a secondary winding L1b of a coupling inductor T1; a pressure doubling unit 2 is composed of a capacitor C4, a diode D6 and a secondary winding L2b of a coupling inductor T2. The high-gain and wide-duty cycle control Boost converter disclosed by the invention has the benefits that on the basis of thebasic Boost converter, the coupling inductor T1, the pressure doubling unit 1, the coupling inductor T2 and the pressure doubling unit 2 are respectively added to obtain two different forms of Boostconverters; the input sides of the two different forms of Boost converters are connected in parallel, and the output sides are connected in a manner of series connection of the capacitors, so that theconverter has higher boosting capacity; the voltage stresses of a switching tube and the diodes are reduced, and the voltage gain can be adjusted within a duty cycle range that d is less than o but more than 1.

The invention relates to an electron beam acceleration power device and a control method. The double-closed-loop voltage stabilizing control method is adopted, according to a front-stage voltage stabilization system, a DC-DC converter is used for voltage regulation, a three-phase rectangular wave inverter is used for inversion, a multi-phase rectangular wave high-voltage alternating current rectifier is used for filtering, high-voltage voltage stabilization element output ends are connected in parallel for voltage stabilization, sampling signals of high voltage element currents and sampling signals of voltage stabilization element currents are output for comprehensive feedback, and low-voltage power supply direct currents are fed forwards for compensation to retrain ripple waves. According to a rear-stage voltage stabilization system, high-voltage electron tubes are connected in series for regulation, voltage sampling signals are output for negative feedback control, a sampling element and a regulator are made to be constant in temperature to improve voltage stabilization precision and dynamic regulation speed. Compared with the prior art, high-voltage rectification conventional ripples, sag voltages and peak pulse voltages can be restrained, and the output voltage stabilization precision and dynamic regulation speed are improved.

The invention belongs to the technical field of semiconductor power device, specifically relates to a high-speed groove MOS device and preparing method thereof, integrates the Schottky diode structure into the groove of each groove MOSFET unit cell and forms the Schottky contact at the bottom of MOSFET unit cell groove, so as to effectively save the silicon surface area and reduce the chip cost. The device has simple manufacturing technology, low cost, new structure and high product performance and reliability, and can effectively restrain the peak voltage and peak current recovered reversely of the groove MOSFET device.

The invention discloses a lossless absorption circuit of a switching power supply output rectifier tube. The lossless absorption circuit comprises a capacitor, a first diode, a second diode and an inductor. One end of the capacitor is connected with the positive output end of a switching power supply rectifier circuit, the other end of the capacitor is connected with the negative pole of the first diode, and the positive pole of the first diode is connected with the negative pole output end of the switching power supply rectifier circuit. The positive pole of the second diode is connected with the negative pole of the first diode, the negative pole of the second diode is connected with one end of the inductor, and the other end of the capacitor is connected with the connection point of output capacitance and output inductance. According to the lossless absorption circuit, the capacitor is used to absorb most energy of leakage inductance of a transformer and most energy of equivalent inductance of stray inductance in the circuit so that the voltage spike on the rectifier diodes is clamped. Meanwhile, impulse currents in the absorption circuit are effectively restrained by aid of the inductor so that large current spike is avoided. The lossless absorption circuit is simple in structure and effectively ensures efficiency and reliability of the power supply.

The embodiment of the invention provides a control circuit and a fly-back switching power supply system. The control circuit is used for controlling the conduction of a synchronous rectification tubein the switching power supply system. The control circuit comprises a VD end which inputs the secondary winding voltage of the switching power supply system, a Gate end which is connected to the gateof the synchronous rectifier tube, and a charging current module, a diode, a first transistor, a capacitor and a second transistor which are connected between the VD end and the Gate end. One end of the charging current module is connected to the VD end, and the other end is connected to the anode of the diode. The cathode of the diode is connected to the drain of the first transistor, one end ofthe capacitor and the gate of the second transistor. The gate of the first transistor receives POR, and the source is grounded. The other end of the capacitor is grounded. The drain of the second transistor is connected to the Gate end, and the source is grounded. When the POR is at a low level, the second transistor is turned on. According to the technical scheme, the peak voltage of the Gate endcan be suppressed, and accidental conduction of the synchronous rectifier tube can be avoided.

The invention discloses a micro-current constant voltage device. The device is applied to a constant current constant voltage charging circuit. The device comprises a peak suppression circuit and a voltage stabilizing circuit, wherein one or more capacitors are connected in parallel to form the peak suppression circuit, the peak suppression circuit is connected between the cathode and the anode of the output end of the constant current constant voltage charging circuit, the voltage stabilizing circuit consists of a voltage stabilizing control circuit, an electronic switch and a shunt resistor, the electronic switch and the shunt resistor are connected in series and are connected between the cathode and the anode of the output end of the constant current constant voltage charging circuit, the voltage stabilizing control circuit has a proportionality coefficient of less than one, the output end of the voltage stabilizing control circuit is connected to a control end of the electronic switch, the voltage stabilizing control circuit is based whether the product of the output voltage value of the constant current constant voltage charging circuit and the proportionality coefficient is larger than the constant voltage setting value of the constant current constant voltage charging circuit, and the electronic switch is controlled to be connected or disconnected. By the aid of the device, the peak voltage output by the constant current constant voltage charging circuit can be suppressed and the voltage stabilizing output of the constant current constant voltage charging circuit can be maintained during the no loading.

The invention provides a novel lossless clamping network of a primary side feedback flyback converter and a design method. The novel lossless clamping network comprises capacitors C11 and C12, an inductor L, diodes D11 and D12, and a voltage stabilizing diode Dz, and is composed of three branches, namely a branch formed by connecting the capacitors C11 and C12 in parallel, a branch of the diode D11 and a branch formed by connecting the diode D12 and the inductor L in series. According to the invention, double capacitors with different capacities are connected in parallel, the large capacitor C12 effectively suppresses voltage overshoot and achieves the clamping function, and the small capacitor C11 improves the response speed; according to different properties of branches, the clamping network is composed of three branches: a capacitor C11 and a capacitor C12 are connected in parallel, so that the response speed is improved, and the voltage peak in the switching-off process of a switching tube is suppressed; the branch of the diode D11 is conducted in the switching-off process of the switching tube, so that a channel is provided for transferring leakage inductance energy to the clamping network; and the diode D12 and the inductor L are connected in series to form a branch, and the capacitor is fed back to store energy in an LC resonance mode in the switching-on process of the switching tube, so that partial drain current of the switching tube is formed.

The invention discloses a high-efficiency low-cost push-pull type direct current transformer. The direct current transformer comprises a push-pull circuit, a transformer circuit and a rectifier circuit, wherein the push-pull circuit comprises two switch tubes connected in a push-pull way and two diodes connected in parallel with the switch tubes, and is connected with the rectifier circuit through the transformer circuit. The direct current transformer is characterized by further comprising an absorption circuit, wherein the absorption circuit comprises a first inductor L7, a second inductor L8, a first capacitor C7 and a second capacitor C8; the first inductor L7 and the first capacitor C7 form a series circuit and are connected with one end of a primary winding of the transformer circuit; and the second inductor L8 and the second capacitor C8 form another series circuit and are connected with the other end of the primary winding of the transformer circuit. According to the direct current transformer, the peak voltage of the switch tube can be suppressed, the voltage withstanding requirement of the switch tube can be lowered, and the service life of a switching device can be prolonged; moreover, the switching loss can be reduced and the total efficiency of a power supply is improved.

The invention discloses a bidirectional DCDC power conversion circuit, which comprises a full-bridge rectification circuit, a transformer, a first diode, a second diode, a first capacitor, a first inductor and a switching circuit; the first diode, the second diode and a primary side coil of the transformer are arranged to form a clamping network, and the turn-to-turn ratio of two coils on the high-voltage side of the transformer is optimized, so that when the bidirectional power conversion circuit works in the forward direction, the clamping network can effectively suppress the peak voltage of a switching device in the switching circuit and reduce the device type selection difficulty of the switching circuit, and when the bidirectional power conversion circuit works in the reverse direction, the clamping network, the full-bridge phase shift circuit and the transformer jointly form a low-impedance loop and a charging loop, and zero-current soft switching and boosting are realized. Compared with an existing bidirectional power conversion circuit which is an LC topology and cannot achieve the boost function during reverse working, the bidirectional power conversion circuit is higher in adaptability, the problems that a clamping diode has reverse recovery characteristics and is large in heat productivity are solved, and the reliability of the circuit is improved.

The invention belongs to the technical field of semiconductor power devices and specifically relates to a composite trench MOS device and a manufacturing method thereof. A Schottky diode structure anda TMBS structure are integrated in a contact hole of each trench MOSFET unit cell, Schottky contact is formed at a side wall of a contact hole of the trench MOSFET unit cell, a switching loss is reduced and spike voltage and spike current are suppressed, and a reverse recovery characteristic is improved. The TMBS structure is formed at the bottom of the contact hole, a balanced electric field canbe formed in the device, the breakdown characteristics of the device are improved, thus while the performance of the device is improved, a silicon surface area is effectively saved, and the cost of achip is reduced. The composite trench MOS device has the advantages of a simple manufacturing process, low cost, a novel structure and high product performance and reliability, peak voltage and peakcurrent of trench MOSFET device reverse recovery can be effectively suppressed, and the voltage withstanding performance of the device is improved.

The invention relates to a main-standby power-type uninterruptible power supply system based on SiC bilateral switches, comprising a main power supply, a backup power supply, a first SiC bilateral switch, a second SiC bilateral switch, a control circuit, a main power voltage-current detection circuit, a backup power voltage-current detection circuit, a driving circuit and a human-machine interface, wherein the main power supply is connected with the main power voltage-current detection circuit and the backup power voltage-current detection circuit, the main power voltage-current detection circuit is connected with the control circuit, the control circuit is connected with the driving circuit, the driving circuit is connected with the first and second SiC bilateral switches, the backup power supply is connected with the backup power voltage-current detection circuit and the second SiC bilateral switch, and the backup power voltage-current detection circuit is connected with the controlcircuit.

The invention belongs to the technical field of semiconductor power devices, and in particular relates to a trench MOS device with an integrated TMBS structure and a manufacturing method thereof. In the invention, the TMBS diode is located between two trench MOSFET unit cells, which effectively and greatly reduces the Switching loss, suppressing peak voltage and peak current, effectively saving the silicon surface area, reducing the cost of the device, due to the introduction of the TMBS diode structure, can greatly reduce the leakage current of the device and improve the safety performance of the device during use.

The invention discloses a buffer serial circuit based on transient voltage suppression; the invention relates to the field of signal conversion and aims to solve the technical problems that the existing serializer exists mismatching of clock frequencies collected by different clock generators in the serializer, leads to relatively large output data error and simultaneously has switching loss and the like. The structure mainly comprises a first clock generator, a first multiplexing circuit, a feedback clock generator, a second multiplexing circuit and a reset circuit, wherein the first clock generator outputs a first clock signal and is used for constructing a signal collecting time window; a sampling clock port of the first multiplexing circuit receives the first clock signal output by the first clock generator, the input end receives a parallel source signal, and the output end outputs a mixed signal; and the reset circuit comprises a passive buffer circuit. The buffer serial circuit disclosed by the invention is used for high-speed serialization of the signal.