48 results about "Bleeder resistor" patented technology

The invention discloses a high-voltage discharge circuit suitable for a storage battery power supply and an electric flame stove. The high-voltage discharge circuit comprises an inversion driving module, a boosting transformer T1, at least three groups of active bridge rectifier modules and discharge modules corresponding to the active bridge rectifier modules. Through combination of driving of the active bridge rectifier module, voltage / current double-closed-loop feedback and real-time PWM signal output control of the control chip U1, current difference of each discharge branch is eliminated, the problem of uneven branch current is solved, and ring current and reactive power loss between branches are eliminated; a diode in a voltage doubling rectifying circuit and a bleeder resistor of a resonance circuit in the prior art are abandoned, an active bridge type rectifying module is adopted for driving, a PWM signal is dynamically adjusted through the low ESR characteristic of a capacitor C1 and closed-loop control, extra power loss is avoided, the working temperature of the circuit is controlled to be below 85 DEG C, and the service life of the circuit is prolonged. And the continuous service life of components in the circuit is prolonged.

The invention discloses an electric energy discharge control device. The energy storage circuit is used for storing potential storage electric energy; the bleeder circuit is used for releasing the potential storage electric energy through a bleeder resistor and a bleeder transistor which are connected in series; the reference voltage setting circuit is used for outputting a reference voltage signal; the bleeder sampling feedback circuit is used for outputting a bleeder sampling feedback electric signal according to the bleeder sampling current of the bleeder resistor; the post-stage voltage feedback circuit is used for outputting a post-stage voltage feedback electric signal according to the potential storage voltage; and the conduction degree of the discharge transistor is controlled according to the post-stage voltage feedback electric signal, the reference voltage signal and the discharge current collection feedback electric signal. The conduction degree of the bleeder transistor is dynamically controlled according to the bleeder current collection feedback electric signal and the post-stage voltage feedback electric signal, so that the change of potential storage electric energy of the energy storage device is dynamically adapted, the bleeder power and the current of the bleeder circuit are stable and controllable, and a higher bleeder rate can be realized under the condition that the bleeder power and the current are kept unchanged.

The invention discloses a PFC (Power Factor Correction) circuit suitable for electrode high-voltage discharge. The PFC circuit comprises an EMI (Electro-Magnetic Interference) filtering module, a starting protection module, a PFC power conversion module and a PWM (Pulse-Width Modulation) switch type auxiliary power supply module which are connected in sequence. The EMI filtering module realizes bidirectional suppression of interference, and when the circuit is powered off, the bleeder resistor enables the common mode inductor and the differential mode capacitor to rapidly discharge, so that secondary interference is prevented; according to the PWM switch type auxiliary power supply module, a high-voltage area and a low-voltage area are isolated, and it is guaranteed that the power supply input pin of the control chip U2 / U3 can be within the normal working voltage; according to the invention, the control chip U2 limits the PWM duty ratio of the control chip U3 through the control logic, so that overcurrent protection is realized; when the MOS tube Q1 / Q2 is conducted, the resistor R22 consumes energy generated by discharging of the capacitor C21, meanwhile, resonance between the capacitor C21 and the energy storage inductor L2 is restrained, high-frequency electromagnetic interference is prevented, and electromagnetic compatibility of the whole system is achieved.

A transmitting module and a method for transmitting differential signals in a serial bus system. The transmitting module has a first to a fourth transmission stage connected in a full bridge, in which the first and fourth transmission stage are connected in series and the third and second transmission stages are connected in series, and a current limiting circuit for measuring and evaluating currents through a first and a second bleeder resistor which are connected to the full bridge. The first to fourth transmission stages generate differential bus signals for a bus in response to the two different values of a digital transmit signal such that the transmitting module generates, in its first operating mode, a first or second bus state on the bus and generates, in its second operating mode, a third or fourth bus state.

The utility model relates to the technical field of filter devices, in particular to a direct-current power grid conducted emission measuring device which comprises a shell, an input interface is arranged at one end of the shell, an output interface is arranged at the other end of the shell, and four cavities are arranged in the shell. The device sequentially comprises an input end wiring area, a power grid conduction measurement function area, a direct current power grid filtering function area and an output end wiring area from left to right, and is characterized in that the power grid conduction measurement function area comprises a current probe and an SMA connector, and the current probe is connected with the SMA connector through a radio frequency coaxial cable; the direct current power grid filtering function area comprises a first capacitor, a second capacitor and a bleeder resistor, the first capacitor and the second capacitor are connected in series, and the bleeder resistor is connected with the first capacitor and the second capacitor in parallel. The device is a multifunctional integrated direct-current power grid conduction emission measuring device.

The invention relates to the technical field of power electronics, and discloses an alkaline electrolytic cell shutdown discharge circuit which comprises a voltage sampling module, a logic control module, a solid-state switch driving module, a bleeder resistor module and a protection module. The voltage sampling module monitors direct-current high voltage of the electrolytic cell in real time and generates low-voltage signals. The logic control module receives the low-voltage signal, compares preset upper and lower threshold voltages, and generates a control signal or a stop signal. And the solid-state switch driving module amplifies the control signal and drives the power switch device to be switched on. The bleeder resistor module converts electric energy into heat energy for dissipation through a power switch device and a bleeder resistor. The protection module absorbs turn-off surges through a fast recovery diode or an RC circuit to protect the power switch device. The system adopts an all-solid-state device to replace a mechanical relay, avoids arc generation, realizes rapid and controllable discharge through closed-loop control, prolongs the service life of equipment, and is suitable for shutdown discharge requirements of the alkaline electrolytic cell in an industrial environment.

The invention discloses a back electromotive force discharge method and system for a direct-current brushless fan of a breathing machine. The method comprises the following steps: receiving a rotating speed adjusting instruction of the direct current brushless fan of the breathing machine, and calling a preset feedforward MAP to obtain an initial discharge duty ratio; according to the obtained initial discharge duty ratio, a discharge circuit is controlled to discharge, and whether rotating speed switching is completed or not is judged; if the judgment is completed, returning the discharge duty ratio to zero, and ending the control; and if the judgment is not completed, acquiring the voltage change rate of the direct current bus in real time by using a bus voltage change rate detection circuit, and dynamically adjusting the discharge duty ratio based on the voltage change rate until the rotation speed switching is completed. The direct-current brushless fan can solve the problems of serious heating, inaccurate discharge and the like of the bleeder resistor, and ensures that the direct-current brushless fan stably and reliably operates under different rotating speed working conditions on the basis of a simple circuit and low cost.

The invention belongs to the technical field of charging power supplies, and particularly relates to an automatic overvoltage protection device for a multi-winding series charging power supply. The multi-winding series charging power supply is mainly composed of an inversion unit, a resonance network, a transformer and n diode rectification modules. The automatic overvoltage protection circuit comprises n isolation units and n overvoltage protection units in one-to-one correspondence with the n isolation units, the n isolation circuits are respectively connected in parallel with the two ends of the n diode rectification modules, and the n overvoltage protection units are respectively connected in parallel with the two ends of the overload; the isolation unit comprises a bleeder resistor R and a switch K which are connected in series; the overvoltage protection unit comprises a light-emitting diode Da, a voltage-regulator tube Db, a divider resistor Ra and a divider resistor Rb, the voltage-regulator tube Db, the divider resistor Ra and the divider resistor Rb are sequentially connected in series, and the light-emitting diode is connected to the two ends of the divider resistor Ra in parallel.

The utility model relates to the technical field of MOS tube testing, in particular to a test fixture for verifying a VGS conduction threshold value of an MOS tube. The test fixture comprises: a DC power supply (DCSOURCE) having at least two independently adjustable output channels; the first terminal (J1) and the second terminal (J2) are used for connecting a tested circuit; a divider resistor (R1) for limiting the current; the bleeder resistor (R2) is used for protecting the MOS tube; a to-be-tested MOS tube (Q1); a light emitting diode (LED1) for indication; a positive electrode of a first channel (CH1) of the DC power supply is connected to the first terminal (J1), and a negative electrode (GND1) is connected to the second terminal (J2). According to the utility model, by adjusting the output voltage of the DC SOURCE CH3, the voltage of the source electrode (S) and the grid electrode (G) of the MOS tube Q1 is changed, and the circuit is used for evaluating the VGS conduction threshold range of the MOS in an earlier stage. The problem that a switch is delayed and even cannot be started due to insufficient precision of matched peripheral voltage of an existing MOS tube is solved.

This utility model discloses a capacitive release test device, including an AC voltage source U s The system comprises a high-precision capacitor module M1, a basic capacitor module M2, a bleeder resistor R, a single-pole miniature circuit breaker QF3, and a single-pole miniature circuit breaker QF4. The high-precision capacitor module M1 includes a single-pole miniature circuit breaker QF1 and a pF-level capacitor C. P Single-pole miniature circuit breaker QF2 and μF-level capacitor C s The basic capacitor module M2 includes a circuit board B, on which several ceramic plate slots Vu are arranged. Each ceramic plate slot Vu is connected to the positive lead p+ of the positive copper claw T+ and the negative lead p- of the negative copper claw T-. This utility model discloses a capacitive release test device that achieves a large capacitance value of over 86nF through the parallel design of 17 ceramic capacitor cells with different capacitance values. The capacitor cells are arranged in a plug-and-play manner to form the basic capacitor module M2, meeting the 27 capacitance values ​​required for capacitive release tests of electrical appliances from 12V to 600V.

The utility model provides a high-voltage non-stroboscopic lamp strip compatible with dimming of various silicon controlled rectifiers. Comprising a rectifier bridge DB1, a linear constant current driving chip U1, a dimming discharge chip U2, a discharge resistor R7, a discharge resistor R8, a U2 sampling resistor R6, a first lamp string, a second lamp string, an electrolytic capacitor E1, an electrolytic capacitor E2, an electrolytic capacitor discharge resistor R4, an electrolytic capacitor discharge resistor R5, a U1 sampling resistor R1, a U1 sampling resistor R2, a U1 sampling resistor R3, a fly-wheel diode D1, a fly-wheel diode D2 and a fly-wheel diode D3, one end of the bleeder resistor R7 is connected with a pin 2 of the rectifier bridge DB1, and the other end of the bleeder resistor R7 is connected with one end of the bleeder resistor R8. The beneficial effects of the utility model are that the circuit can be compatible with silicon controlled dimmers of different specifications, and solves a problem that a lamp strip is liable to flicker under the condition of low power in a dimming process.

The invention provides a diagnosis circuit and method for the health state of a battery system of an electric vehicle. The diagnosis circuit comprises a battery pack, a motor controller and a driving motor, the first end of the battery pack is connected with the center line of the driving motor through the pre-charging unit, the diagnosis circuit relay and the fuse, the first end of the battery pack is connected with the first end of the motor controller through the main positive relay, and the second end of the battery pack is connected with the second end of the motor controller through the negative relay and the sensor module. Three-phase stator windings of the driving motor are respectively connected with each inverter bridge power group in the motor controller module; and the control module, the bleeder resistor, the thin-film capacitor and all the inverter bridge power groups are connected to form a diagnosis circuit which is used for controlling the on-off of each inverter bridge power group and injecting alternating current voltage into the battery system. According to the invention, online measurement of the health state of the battery pack can be realized without adding extra hardware equipment, and the diagnosis cost is reduced.

The invention discloses a discharge control circuit, a discharge control method and a new energy automobile, and relates to the technical field of new energy automobiles. The discharge control circuit comprises a power battery, a direct current-direct current converter, a first switch, a second switch, a bus capacitor, a motor three-phase winding, a motor, a motor information acquisition sensor, a bleeder resistor control switch, a bleeder resistor and a control device, the bleeder resistor is connected in parallel between a power battery and a motor three-phase winding, the DC-DC converter is connected in parallel between the bleeder resistor and the power battery, the bleeder resistor control switch is connected in series with the bleeder resistor, and the first switch, the second switch and the bleeder resistor control switch are used for controlling whether the DC-DC converter and the bleeder resistor are connected to a circuit or not; the corresponding different discharging methods are executed according to different motor working conditions, so that the reasonability, the stability and the efficiency of the voltage quick release scheme of the high-voltage system of the new energy automobile are improved.

The invention provides a negative-voltage-surge-resistant reverse-connection-preventing direct-current filtering assembly, and relates to the technical field of electronics, the negative-voltage-surge-resistant reverse-connection-preventing direct-current filtering assembly comprises a reverse-connection-preventing circuit, a leakage circuit, an acquisition control circuit and an input common-mode filtering circuit, the reverse-connection-preventing circuit comprises a first NMOS tube, the drain electrode of the first NMOS tube is connected with a negative electrode bus, the source electrode of the first NMOS tube is electrically connected with a first system ground end, and the drain electrode of the first NMOS tube is electrically connected with a second system ground end; the grid is electrically connected with the positive bus through the target resistor; the acquisition control circuit is used for acquiring a bus voltage and controlling the first NMOS tube to be turned off within a first preset duration when the bus voltage is smaller than or equal to a first preset voltage threshold value; and when input power failure occurs, discharging is performed on the group of capacitors through the first bleeder resistor when the bus voltage drops to a second preset voltage threshold value, and discharging is performed on the group of capacitors through the second bleeder resistor when the bus voltage drops to a preset safety voltage value from the second preset voltage threshold value. According to the technical scheme, the effect of improving the reliability of the direct current filtering assembly is achieved.

The utility model discloses a high-integration-level steering wheel system, which relates to the technical field of mobile robots and comprises a hub motor, a wheel carrier, a driver, a bleeder resistor, a side cover, a rotating shaft, a limiting disc, a right-angle speed reducer and a steering motor. The hub motor comprises a rubber wheel, a steel ring, a driving motor front cover, a driving motor rear cover, a front bearing, a rear bearing, a split type encoder, a motor shaft, a corrugated gasket, a motor stator, a motor rotor and a framework oil seal. The utility model has the characteristics of good sealing performance, strong anti-vibration capability, high integration level and low cost, and is suitable for outdoor occasions with strict spatial dimension requirements. The system can adapt to various outdoor environments, and the product integration degree is further improved.

A transmitting module and a method for transmitting differential signals in a serial bus system. The transmitting module has a first to a fourth transmission stage connected in a full bridge, in which the first and fourth transmission stage are connected in series and the third and second transmission stages are connected in series, and a current limiting circuit for measuring and evaluating currents through a first and a second bleeder resistor which are connected to the full bridge. The first to fourth transmission stages generate differential bus signals for a bus in response to the two different values of a digital transmit signal such that the transmitting module generates, in its first operating mode, a first or second bus state on the bus and generates, in its second operating mode, a third or fourth bus state.

According to the electrostatic coating machine disclosed by the embodiment of the invention, the risk of sparks can be reduced, even if the set linear speed is higher than the linear speed of coating according to a close-range painting method before. In a coater that performs electrostatic coating using a high voltage generated by a cascade, when a time constant [tau] is defined as a product of a total capacitance Co of the electrostatic coater and a bleeder resistor R1, the product of the total capacitance Co and the bleeder resistor R1 is set such that the time constant [tau] is 0.005 to 0.050.

The invention provides a reverse pre-charging control method of a vehicle-mounted DC / DC converter, and relates to the field of power supply control. The vehicle-mounted DC / DC converter comprises a primary side circuit, a transformer and a secondary side circuit which are in cascade connection, the primary side circuit is connected with a high-voltage side capacitor in parallel, the secondary side circuit is connected with a low-voltage side capacitor in parallel, and the secondary side circuit comprises a low-voltage side inductor, at least one switch tube and a stress absorption circuit connected with the switch tube in parallel. Wherein the stress absorption circuit comprises an absorption capacitor, a bleeder resistor and a bleeder switching tube which are connected in series, when the duty ratio of the switching tube in the secondary circuit is smaller than or equal to 50%, the initial voltage of the absorption capacitor is reduced, and the stress of the switching tube in the secondary circuit is inhibited by reducing the single-cycle energy storage of the low-voltage side inductor.

The invention belongs to the technical field of motor control, and particularly relates to a steering engine braking energy discharge control circuit and method based on an FPGA. The circuit comprises a voltage acquisition circuit, a PWM generation module, a temperature acquisition circuit and a bleeder power circuit, the bleeder power circuit comprises a bleeder tube, a bleeder resistor, a first temperature sensitive resistor and a second temperature sensitive resistor, the drain electrode of the bleeder tube is connected with one end of the bleeder resistor, and the grid electrode of the bleeder tube is connected with the output end of the PWM generation module; the source electrode of the bleeder tube and the other end of the bleeder resistor are connected with the input end of the voltage acquisition circuit; one end of the first temperature-sensitive resistor is connected with a first forward input end of the temperature acquisition circuit, and the other end of the first temperature-sensitive resistor is connected with a first reverse input end of the temperature acquisition circuit; and one end of the second temperature-sensitive resistor is connected with a second positive input end of the temperature acquisition circuit, and one end of the second temperature-sensitive resistor is connected with a second negative input end of the temperature acquisition circuit.

The invention relates to a method and system for determining the resistance value of a bleeder resistor of a flexible direct-current converter valve, and belongs to the technical field of direct-current power transmission. Comprising the following steps: taking the smaller value of a first upper limit value and a second upper limit value of a corresponding bleeder resistor obtained according to the requirement of a power transmission system on the bleeder power of a converter valve and the requirement of the power transmission system on the voltage rise amount of a capacitor as the actual upper limit value of the value of the bleeder resistor; taking a larger value in a first lower limit value and a second lower limit value of the corresponding bleeder resistor as an actual lower limit value of the value of the bleeder resistor, wherein the larger value is obtained according to the requirement of a power transmission system on the current of a converter valve bleeder branch and the requirement that the bleeder resistor of the converter valve only acts once in each power frequency electric period; and determining the value range of the bleeder resistor according to the actual upper limit value and the actual lower limit value. According to the method, the requirement for the discharge power, the requirement for the capacitor voltage rise amount, the requirement for the discharge branch current and the requirement for the action of each power frequency electric cycle of the discharge resistor are comprehensively considered, and the discharge resistor is accurately and efficiently determined.

An electrostatic coating machine according to the present embodiments can reduce the risk of sparking even when setting a higher line speed than before when performing coating according to a proximity painting method. In the coating machine that performs electrostatic coating by use of a high voltage generated by a cascade, when a time constant τ is defined as the product of a total capacitance Co of the electrostatic coating machine and a bleeder resistor R1, the product of the total capacitance Co and the bleeder resistor R1 is set so that the time constant τ is 0.005 to 0.050.

The present application relates to a kind of gallium nitride motor controllers and resonance elimination method, belong to power electronics field, solve when using traditional RC absorption circuit, resistance is easy to overheat damage under high-frequency switching condition, leading to the problem of protection function failure.Control device includes: power supply, with motor series connection, control motor's on-off electricity, including the gallium nitride switch tube with parasitic capacitance;Resonance elimination circuit, connected to power supply control device, freewheeling diode and the absorption capacitor and bleeder resistor connected in parallel are connected in series, when gallium nitride switch tube is in the off stage, current is through freewheeling diode forward conduction, absorption capacitor is charged so that absorption capacitor voltage gradually rises;When gallium nitride switch tube is in energy bleeder stage and capacitor rises to predetermined voltage, discharge is carried out through resistor, and electric energy is converted into heat energy and is smoothly dissipated.Effective inhibition of high-frequency resonance and reliable protection of switch tube are realized.

The invention discloses a closed-loop double-feedback collaborative robot regeneration control method and device and a storage medium, and belongs to the technical field of servo bus voltage regeneration control, and the method comprises the following steps: continuously obtaining a bus voltage and a bleeder resistor temperature of a collaborative robot; comparing the real-time bleeder resistor temperature with a preset bleeder resistor temperature threshold interval set, and judging a bleeder resistor temperature threshold interval specifically corresponding to the bleeder resistor temperature; according to different temperature threshold intervals of the bleeder resistor, different weight analysis algorithms are adopted to calculate weight gains, and the weight gains are obtained; a PI algorithm is adopted to calculate the real-time bus voltage and a preset bus voltage target value to obtain a PI calculation result, and the PI calculation result and the weight gain are summed to obtain an IGBT turn-on duty ratio value; and controlling the switching action of the IGBT according to the IGBT turn-on duty ratio value. When the servo joint of the robot is braked quickly, the bleeder resistor can work within the limit load for a long time, and the temperature abnormity alarm probability of the bleeder resistor is reduced.

A High Electron Mobility Transistor, HEMT, structure (1) having a gate (G), a source (S) and a drain (D), said HEMT structure comprising a depletion-mode transistor (3) having a breakdown voltage, current limiting means (9) arranged for ensuring that a drain source current of said HEMT structure, in an off-state of said HEMT structure, is at most 20 nA / mm, being a current per unit gate length of the depletion-mode transistor, wherein the HEMT structure may comprise a cascode configuration of said depletion-mode transistor with an enhancement mode transistor (6). The current limiting means may be embodied by a bleed resistor 9 that may additionally prevent the enhancement-mode transistor to enter avalanche. The bleed resistor may be connected between the gate terminal of the enhancement-mode transistor and the source terminal of the enhancement-mode transistor.

The invention discloses a fast rear-end auxiliary tube control low-end ideal diode based on an NMOS (N-channel Metal Oxide Semiconductor) tube, which relates to the technical field of power diodes and comprises a power supply VCC, an NMOS main tube V1, a comparator circuit, a bias power supply and a driving circuit, the comparator circuit comprises two independent auxiliary tubes or pair tubes and a resistor; the comparator circuit is used for comparing voltages at two ends of a source electrode and a drain electrode of the NMOS main tube V1, and a comparison signal of the comparator circuit transmits an amplification signal to a grid electrode of the NMOS main tube V1 through the driving circuit to control the conduction and cut-off of the NMOS main tube V1; and a current bleeder resistor R3 is also connected between the grid electrode and the source electrode of the NMOS main tube V1. Compared with the prior art, the fast type rear-end auxiliary tube control low-end ideal diode based on the NMOS tube has the advantages that backward flowing can be prevented, and a pre-stage circuit can be protected.

The utility model provides a super capacitor discharge instrument used for a wind power generation pitch system, comprising a super capacitor discharge assembly used for the wind power generation pitch system, the super capacitor discharge assembly comprises a cabinet body, a cabinet door, a push-type switch, a display screen, a bleeder resistor and a PCB voltage detection board card, the cabinet door is hinged to the front part of the cabinet body, and the push-type switch is arranged on the cabinet door. The push type switch and the display screen are both installed on the cabinet door, the bleeder resistor and the PCB voltage detection board card are both installed in the cabinet body, a wiring end of the bleeder resistor is connected with a cable, and the wiring end of the bleeder resistor is connected with a super capacitor in an external wind power generation variable pitch system through the cable. According to the super capacitor discharger for the wind power generation variable pitch system, the problem that the super capacitor with a fixed structure needs to be assembled and disassembled and the energy needs to be discharged in the maintenance process is fundamentally solved, and meanwhile the dangerous situation possibly occurring in the maintenance process of workers is avoided.

The utility model relates to the technical field of filters, in particular to a small-size high-voltage filter. Aiming at an application scene with strict space limitation, the filter adopts the design of a 6061 aviation aluminum integrated milling shell, a polyether-ether-ketone (PEEK) insulating plate, an output interface formed by combining a gold-plated copper platform with a flexible lead and the like, so that light weight and miniaturization are realized. Main devices comprise a common-mode inductor, a differential-mode capacitor, a common-mode capacitor and a bleeder resistor to form a first-order low-pass filter circuit, EMI interference of 10 kHz to 10 MHz is effectively restrained, and the electromagnetic compatibility requirement (GJB151ACE102) under the working condition of direct current 540V / 50A is met. The size of the product is only 40cm < 3 >, the weight is 128g, and the product has high insulativity, low contact resistance and excellent vibration resistance, and is suitable for the fields with strict requirements on size and reliability, such as aerospace and the like.

The present application relates to the technical field of voltage stabilizing circuits, and in particular to an ultra-low voltage stabilizing circuit, method, and control module. The ultra-low voltage stabilizing circuit includes: a voltage output node, which is used to output a first voltage; a control module, which controls the first voltage based on a user's operation instruction, and the operation instruction carries a target value of the first voltage; a voltage stabilizing module, which is used to discharge the leakage voltage acting on the voltage output node, and includes a first discharge resistor and a switching transistor, the first discharge resistor and the switching transistor are connected in series between the voltage output node and the ground potential; wherein the control module is configured to control the switching transistor to turn on in response to the target value being less than a set threshold, and to control the switching transistor to turn off in response to the target value being greater than the set threshold.

The invention discloses a high-voltage servo driver discharge device based on high-resistance isolation sampling, and the discharge device employs a high-resistance isolation bus sampling design, a bus high voltage is scaled down into a sampling voltage, and the sampling voltage is compared with a discharge threshold voltage through a comparator after conditioning. And the output of the comparator controls the grid voltage of the SiC MOS tube through the isolation driving circuit, so that the on-off of the bleeder resistor connected between the bus voltage and the ground is controlled, and the purpose of discharging when the bus voltage exceeds a threshold value is achieved. The device can protect the high-voltage servo driver from instantaneous high-voltage impact of bus fluctuation, back electromotive force and the like, and normal work of the servo driver is maintained.

The invention provides a full-wave rectification absorption circuit and a full-bridge conversion circuit, and relates to the technical field of power electronics, and the full-wave rectification absorption circuit comprises a full-wave rectification module composed of switching devices, and a peak absorption module composed of a bleeder resistor, at least one absorption capacitor and at least one absorption diode. The absorption capacitor is connected in parallel with the absorption diode, the absorption capacitor is also connected in series with the bleeder resistor, and the switching device is connected in series between the absorption capacitor and the absorption diode; or the absorption capacitor is connected in parallel with the bleeder resistor, and the absorption capacitor is also connected in series with the switching device and the absorption diode. By adjusting the connection mode of a bleeder resistor, an absorption capacitor and an absorption diode in the peak absorption module, energy stored in the absorption capacitor discharged by the bleeder resistor can be reduced, and energy transmitted from the absorption capacitor to an output capacitor of the full-bridge conversion circuit can be increased. Therefore, the energy utilization rate of the full-wave rectification absorption circuit can be improved.