CN110920398A - Active discharge circuit and power electronic equipment - Google Patents
Active discharge circuit and power electronic equipment Download PDFInfo
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- CN110920398A CN110920398A CN201911096280.XA CN201911096280A CN110920398A CN 110920398 A CN110920398 A CN 110920398A CN 201911096280 A CN201911096280 A CN 201911096280A CN 110920398 A CN110920398 A CN 110920398A
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- 239000003990 capacitor Substances 0.000 claims abstract description 65
- 238000007599 discharging Methods 0.000 claims abstract description 5
- 238000005070 sampling Methods 0.000 claims description 36
- 238000002955 isolation Methods 0.000 claims description 22
- 230000017525 heat dissipation Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
Abstract
The embodiment of the invention discloses an active discharge circuit and power electronic equipment, wherein the active discharge circuit is used for discharging a direct current bus capacitor connected between a positive bus and a negative bus in a driving device, and comprises a control unit, a switching tube and a discharge resistor, wherein the switching tube and the discharge resistor are connected in series and then are connected in parallel with the direct current bus capacitor; the active discharge circuit further comprises a driving branch circuit, the control unit is connected to the control end of the switch tube through the driving branch circuit, and the driving branch circuit drives the switch tube to be conducted in a preset mode according to the voltage at two ends of the direct-current bus capacitor when the control unit outputs a discharge signal or the control unit fails, so that the discharge resistor is prevented from being burnt.
Description
Technical Field
The embodiment of the invention relates to the field of electronic power, in particular to an active discharge circuit and power electronic equipment.
Background
The motor controller is a key unit in the electric automobile, in the motor controller, a direct current bus capacitor is used as the input of an inverter, and the inverter outputs three-phase alternating current to drive a permanent magnet synchronous motor, so that the electric automobile is driven to normally run. When parking, vehicle collision or controller trouble, can break off the contactor between bus capacitor and the battery, because still have the high pressure on the bus capacitor, if not put in time, can bring the safety risk to the personnel. For safety reasons, the voltage across the dc bus capacitor is typically reduced below 60V in the above case by an active discharge circuit. The common active discharge circuit forms comprise bridge arm through discharge, motor winding discharge, DC/DC discharge and discharge resistance discharge of a power switch tube, wherein the bridge arm through discharge needs to control an upper bridge arm or a lower bridge arm to be in a linear open state, the control is difficult, the switch tube is easy to burn, and when a vehicle collision occurs, a motor rotates at a high speed and cannot discharge through the winding; the DC/DC discharge has the problem of low discharge efficiency and can not meet the requirement of discharge time, so that at present, most of the DC/DC discharge adopts a switching tube and a discharge resistor which are connected in series as a whole and are connected in parallel at two ends of a DC bus capacitor, and the discharge of the DC bus capacitor to the discharge resistor is controlled by controlling the on-off of the switching tube.
However, the initial voltage at both ends of the dc bus capacitor is very high, and when the dc bus capacitor is connected in parallel to both ends of the discharge resistor, the power of the discharge resistor is very high, which increases the volume, cost and heat dissipation space of the discharge resistor. In addition, under the condition that the motor controller is abnormal and the like, the switching tube cannot be conducted, so that the direct current bus cannot discharge, or the direct current bus capacitor discharges for a long time, so that the discharge resistor is burnt.
Disclosure of Invention
The embodiment of the invention provides an active discharge circuit and power electronic equipment aiming at the problems that when the direct-current bus capacitor is connected in parallel at two ends of a discharge resistor, the discharge resistor has high power, and the volume, the cost and the heat dissipation space of the discharge resistor are large.
The embodiment of the invention adopts the technical scheme for solving the technical problems that: the active discharge circuit is used for discharging a direct current bus capacitor connected between a positive bus and a negative bus in a driving device and comprises a control unit, a switching tube and a discharge resistor, wherein the switching tube and the discharge resistor are connected in series and then are connected in parallel with the direct current bus capacitor; the active discharge circuit further comprises a driving branch, the control unit is connected to the control end of the switch tube through the driving branch, and the driving branch drives the switch tube to be conducted in a preset mode according to the voltage at two ends of the direct current bus capacitor when the control unit outputs a discharge signal or the control unit fails, wherein the preset mode is as follows: the larger the voltage at the two ends of the direct current bus capacitor is, the shorter the conducting time of the switch tube in unit time is.
Preferably, the driving branch comprises an isolation unit, a driving signal adjusting unit and a sampling unit; the output end of the control unit is connected with the enable end of the drive unit through the isolation unit, and the isolation unit outputs an enable signal to the drive unit when the control unit outputs a discharge signal or the control unit fails; the sampling unit is used for sampling voltages at two ends of the direct current bus capacitor, and the output end of the sampling unit is connected to the input end of the driving signal adjusting unit; the output end of the driving signal adjusting unit is connected to the input end of the driving unit, and outputs a conduction level according to the voltage at two ends of the direct current bus capacitor sampled by the sampling unit, and the larger the voltage at two ends of the direct current bus capacitor is, the shorter the duration of the conduction level in unit time is; the output end of the driving unit is connected with the control end of the switch tube, and the output end of the driving unit drives the switch tube to be conducted when receiving the enabling signal and the conducting level so as to discharge the direct current bus capacitor through the discharge resistor.
Preferably, the active discharge circuit further comprises a high-voltage power supply, wherein the positive electrode of the high-voltage power supply is connected with the positive bus, the negative electrode of the high-voltage power supply is connected with the negative bus, and the output end of the high-voltage power supply is respectively connected with the power supply ends of the isolation unit, the signal generation subunit, the comparison subunit and the driving unit.
Preferably, the driving signal adjusting unit includes a signal generating subunit and a comparing subunit, a first input end of the comparing subunit is connected to the output end of the sampling unit, a second input end of the comparing subunit is connected to the output end of the signal generating subunit, an output end of the comparing subunit is connected to the input end of the driving unit, and when the voltage generated by the signal generating subunit is greater than the voltage at two ends of the dc bus capacitor obtained by sampling by the sampling unit, a conduction level is output to the driving unit.
Preferably, the active discharge circuit further includes a discharge unit, and the output terminal of the high voltage power supply is connected to the enable terminal of the driving unit via the discharge unit, and pulls up the voltage of the enable terminal of the driving unit when the control unit outputs a discharge signal or the control unit fails.
Preferably, the sampling unit includes a first resistor, a second resistor, and a first capacitor, and the first resistor and the second resistor are connected in series in sequence and then connected in parallel to two ends of the dc bus capacitor, and the first capacitor is connected in parallel to the second resistor; and the connection point of the first resistor and the second resistor forms the output end of the sampling unit.
Preferably, the comparing subunit includes a comparator, and a non-inverting input terminal of the comparator is connected to the output terminal of the signal generating subunit, a inverting input terminal of the comparator is connected to the output terminal of the sampling unit, an output terminal of the comparator is connected to the input terminal of the driving unit, and a power supply terminal of the comparator is connected to the output terminal of the high voltage power supply.
Preferably, the signal generating subunit includes a triangle wave generator, an output end of the triangle wave generator is connected to a non-inverting input end of the comparator, and a power supply end is connected to an output end of the high-voltage power supply.
Preferably, the discharge unit includes a resistor group formed by one or more resistors connected in series, and one end of the resistor group is connected to the output terminal of the high voltage power supply, and the other end of the resistor group is connected to a connection point between the enable terminal of the driving unit and the output terminal of the isolation unit.
The embodiment of the invention also provides power electronic equipment which comprises a circuit board, wherein the circuit board is provided with the active discharge circuit.
According to the active discharge circuit and the power electronic equipment, the drive branch controls the on time of the switch tube in unit time (namely, the time for adjusting and controlling the on and off of the switch tube) according to the voltage of the direct current bus capacitor so as to avoid the burning of the discharge resistor, and therefore, when the circuit is designed, the resistor with smaller pulse power can be selected as the discharge resistor, so that the cost and the volume of the discharge resistor are reduced, and the heat dissipation space is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.
FIG. 1 is a schematic diagram of an active discharge circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an active discharge circuit in another embodiment of the present invention;
FIG. 3 is a circuit diagram of an active discharge circuit in another embodiment of the present invention;
FIG. 4 shows the conduction level of the switch tube according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 shows an active discharge circuit according to an embodiment of the present invention, which can be used to discharge a dc bus capacitor C1 connected between a positive bus and a negative bus in a driving device. The active discharge circuit comprises a control unit 10, a switch tube Q1, a discharge resistor RL and a driving branch circuit 20, wherein the switch tube Q1 and the discharge resistor RL are connected in series and then are connected in parallel with a direct-current bus capacitor C1; the control unit 10 is connected to the control end of the switching tube Q1 via the driving branch 20, and when the control unit 10 outputs a discharging signal or the control unit 10 fails (at this time, no signal is output from the output end of the control unit 10), the driving branch 20 drives the switching tube Q1 to conduct according to the voltage across the dc bus capacitor C1 in a preset manner: the larger the voltage across the direct current bus capacitor C1 is, the shorter the on-time of the switch tube Q1 in unit time is.
The switching tube Q1 may be an N-type Metal-Oxide-Semiconductor (i.e., NMOS) or an Insulated Gate bipolar transistor (i.e., IGBT). The control unit can be a control unit in a motor controller, and can realize the discharge control of the active discharge circuit.
When the circuit needs to discharge the dc bus capacitor C1, the control unit 10 outputs a discharge signal (e.g., high level) to the driving branch 20, and after the driving branch 20 receives the discharge signal, the switching tube Q1 is controlled to be turned on according to the voltage across the dc bus capacitor C1, so that the dc bus capacitor C1 discharges the discharge resistor RL. When the direct current bus capacitor C1 does not need to be discharged, the control unit 10 outputs a signal that the discharge is not needed to the driving branch 20, and after the driving branch 20 receives the signal, the switching tube Q1 is controlled to be in the off state, and at this time, the direct current bus capacitor C1 does not discharge.
The active discharge circuit can be applied to an application scenario of an electric vehicle, for example, when the electric vehicle is parked, the control unit 10 outputs a discharge signal to the driving branch 20 to control the switching tube Q1 to be turned on, and the dc bus capacitor C1 discharges; when the control unit of the electric automobile has a fault, the circuit can control the on-time of the switching tube Q1 in unit time (namely, the on-time and the off-time of the switching tube Q1 are adjusted and controlled) through the driving branch circuit 20, so that the effect of reducing the pulse power of the discharge resistor RL is achieved, and in this way, when the circuit is designed, the resistor with smaller pulse power can be selected as the discharge resistor RL, so that the cost and the volume of the discharge resistor RL are reduced, and the heat dissipation space is reduced.
Specifically, as shown in fig. 2, the driving branch 20 may include an isolation unit 21, a driving unit 22, a driving signal adjusting unit 23, and a sampling unit 24; the output end of the control unit 10 is connected with the enable end of the driving unit 22 through the isolation unit 21, and the isolation unit 21 outputs an enable signal to the driving unit 22 when the control unit 10 outputs a discharge signal or the control unit 10 fails; the sampling unit 24 is used for sampling the voltage at two ends of the direct current bus capacitor C1, and the output end of the sampling unit 24 is connected to the input end of the driving signal adjusting unit 23; the output end of the driving signal adjusting unit 23 is connected to the input end of the driving unit 22, and outputs a conduction level according to the voltage at the two ends of the dc bus capacitor C1 sampled by the sampling unit 24, and the larger the voltage at the two ends of the dc bus capacitor C1 is, the shorter the duration of the conduction level in unit time is; the output terminal of the driving unit 22 is connected to the control terminal of the switching transistor Q1, and when receiving the enable signal and the conducting level, the driving switching transistor Q1 is turned on to discharge the dc bus capacitor C1 through the discharge resistor RL.
In the active discharge circuit, the input and output logic of the isolation unit 21 is: inputting high level and outputting high level; inputting a low level and outputting the low level; when there is no input signal, the output defaults to high level. The on level may be a Pulse Width Modulation (PWM) signal, and the shorter the duration of the on level per unit time, the smaller the duty ratio of the PWM signal.
When the active discharge circuit does not need to discharge, the control unit 10 outputs a low-level signal, and the isolation unit 21 outputs a low-level signal to the enable end of the driving unit 22, so that the switching tube Q1 is in an off state, and the bus capacitor cannot discharge through the discharge resistor RL.
When the active discharge circuit is actively discharged (i.e., the control unit 10 outputs a discharge signal) or the control unit 10 fails (e.g., the control unit 10 fails due to adhesion of a contactor between a storage battery and a bus capacitor in an electric vehicle and no signal is output), the control unit 10 outputs a high level, the isolation unit 21 outputs an enable signal (i.e., the high level) to an enable end of the driving circuit, and meanwhile, the sampling unit 24 samples voltages at two ends of the dc bus capacitor C1 and outputs the voltages to the driving signal adjustment unit 23, so that the driving signal adjustment unit 23 can output a conduction level to the driving unit 22 according to the voltages sampled by the sampling circuit; when the driving circuit receives the enable signal and the conducting level at the same time, the switching tube Q1 is driven to be conducted, so that the direct current bus capacitor C1 discharges the discharge resistor RL. In the above circuit, as the discharging process continues, the voltage across the dc bus capacitor C1 decreases, so that the duration of the on level per unit time is longer (i.e., the duty ratio of the PWM signal is larger).
Specifically, as shown in fig. 3, in order to realize that the larger the voltage across the dc bus capacitor C1 is, the shorter the duration of the on level in a unit time is, the above-mentioned driving signal adjusting unit 23 may include a signal generating subunit 231 and a comparing subunit 232, where a first input terminal of the comparing subunit 232 is connected to the output terminal of the sampling unit 24, a second input terminal is connected to the output terminal of the signal generating subunit 231, and an output terminal is connected to the input terminal of the driving unit 22, and outputs the on level to the driving unit 22 when the voltage generated by the signal generating subunit 231 is greater than the voltage across the dc bus capacitor C1 sampled by the sampling unit 24.
The signal generating subunit 231 may comprise a signal generator, the main purpose of which is to generate a specific regular voltage, such as a triangular wave or a sine wave. In the above circuit, the comparing subunit compares the voltage generated by the signal generating subunit 231 with the voltage sampled by the sampling unit 24, and outputs the on level when the voltage generated by the signal generating subunit 231 is greater than the voltage across the dc bus capacitor C1 sampled by the sampling unit 24. Illustratively, the signal generating subunit 231 generates a triangular wave in one wave generating period, and the waveform of the on level thereof can be as shown in fig. 4, where Vc represents the voltage sampled by the sampling unit, Vf represents the voltage output by the signal generating subunit, and Vq represents the on level of the switching tube Q1.
Preferably, the signal generating subunit 231 may be configured to emit a triangular wave, and correspondingly, the signal generating subunit 231 may include a triangular wave generator, an output terminal of the triangular wave generator is connected to a non-inverting input terminal of the comparator, and a power supply terminal is connected to an output terminal of the high voltage power supply.
In addition, the sampling unit 24 may include a first resistor R1, a second resistor R2, and a first capacitor C1, where the first resistor R1 and the second resistor R2 are sequentially connected in series and then connected in parallel to two ends of a dc bus capacitor C1, and the first capacitor C1 is connected in parallel to the second resistor R2; the junction of the first resistor R1 and the second resistor R2 constitutes the output of the sampling unit 24.
The comparing subunit 232 may include a comparator, and a non-inverting input terminal of the comparator is connected to the output terminal of the signal generating subunit 231, an inverting input terminal of the comparator is connected to the output terminal of the sampling unit 24, an output terminal of the comparator is connected to the input terminal of the driving unit 22, and a power supply terminal of the comparator is connected to the output terminal of the high voltage power supply.
In another embodiment of the present invention, in order to supply power to each component in the circuit, the active discharge circuit may further include a high voltage power supply 30, and a positive electrode of the high voltage power supply 30 is connected to the positive bus, a negative electrode of the high voltage power supply 30 is connected to the negative bus, and output terminals of the high voltage power supply are respectively connected to power supply terminals of the isolation unit 21, the driving unit 22, and the driving signal adjustment unit 23. The circuit directly gets electricity from the direct current bus capacitor C1 through the high voltage power supply 30, converts the high voltage of the direct current bus capacitor C1 into the voltage suitable for each unit component in the circuit, supplies power for the unit components, does not need to be provided with an extra power supply, and saves the cost.
The active discharge circuit may further include a discharge unit, and the output terminal of the high voltage power supply 30 is connected to the enable terminal of the driving unit 22 via the discharge unit, and pulls up the voltage of the enable terminal of the driving unit 22 when the control unit 10 outputs a discharge signal or the control unit 10 fails.
In the above circuit, the isolation unit 21 may be an optical coupler, when the control unit 10 outputs a discharge signal (a high level signal), the isolation unit 21 is in an off state, and at this time, the high voltage power supply 30 pulls up the potential of the enable terminal of the driving unit 22 through the discharge unit (that is, the isolation unit 21 outputs the enable signal through the discharge unit), so as to ensure that the isolation unit 21 outputs a high level when the control unit 10 outputs a high level or the control unit 10 fails (no signal is output).
Specifically, the discharge unit may include a resistor group Rs composed of one or more resistors connected in series, and one end of the resistor group Rs is connected to the output terminal of the high voltage power supply 30, and the other end is connected to a connection point of the enable terminal of the driving unit 22 and the output terminal of the isolation unit 21, so as to limit the current of the high voltage power supply 30 through the resistor group Rs.
The embodiment of the invention also provides the power electronic equipment which can be a frequency converter, an inverter, voltage conversion equipment and the like. The power electronic equipment comprises a circuit board, and the active discharge circuit is arranged on the circuit board.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (10)
1. An active discharge circuit is used for discharging a direct current bus capacitor connected between a positive bus and a negative bus in a driving device, and comprises a control unit, a switching tube and a discharge resistor, wherein the switching tube and the discharge resistor are connected in series and then are connected in parallel with the direct current bus capacitor; the active discharge circuit is characterized by further comprising a driving branch, the control unit is connected to the control end of the switch tube through the driving branch, and the driving branch drives the switch tube to be conducted in a preset mode according to voltage at two ends of the direct-current bus capacitor when the control unit outputs a discharge signal or the control unit fails, wherein the preset mode is as follows: the larger the voltage at the two ends of the direct current bus capacitor is, the shorter the conducting time of the switch tube in unit time is.
2. The active discharge circuit of claim 1 wherein the drive branch comprises an isolation unit, a drive signal adjustment unit, and a sampling unit; the output end of the control unit is connected with the enable end of the drive unit through the isolation unit, and the isolation unit outputs an enable signal to the drive unit when the control unit outputs a discharge signal or the control unit fails; the sampling unit is used for sampling voltages at two ends of the direct current bus capacitor, and the output end of the sampling unit is connected to the input end of the driving signal adjusting unit; the output end of the driving signal adjusting unit is connected to the input end of the driving unit, and outputs a conduction level according to the voltage at two ends of the direct current bus capacitor sampled by the sampling unit, and the larger the voltage at two ends of the direct current bus capacitor is, the shorter the duration of the conduction level in unit time is; the output end of the driving unit is connected with the control end of the switch tube, and the output end of the driving unit drives the switch tube to be conducted when receiving the enabling signal and the conducting level so as to discharge the direct current bus capacitor through the discharge resistor.
3. The active discharge circuit of claim 2 further comprising a high voltage power supply, wherein the positive pole of the high voltage power supply is connected to the positive bus, the negative pole of the high voltage power supply is connected to the negative bus, and the output terminals of the high voltage power supply are connected to the power supply terminals of the isolation unit, the driving signal adjustment unit, and the driving unit, respectively.
4. The active discharge circuit of claim 3, wherein the driving signal adjusting unit comprises a signal generating subunit and a comparing subunit, a first input terminal of the comparing subunit is connected to the output terminal of the sampling unit, a second input terminal of the comparing subunit is connected to the output terminal of the signal generating subunit, and an output terminal of the comparing subunit is connected to the input terminal of the driving unit, and the comparing subunit outputs a conducting level to the driving unit when the voltage generated by the signal generating subunit is greater than the voltage across the dc bus capacitor sampled by the sampling unit.
5. The active discharge circuit of claim 3, further comprising a discharge unit, wherein the output terminal of the high voltage power supply is connected to the enable terminal of the driving unit via the discharge unit, and the output terminal of the high voltage power supply pulls up the voltage of the enable terminal of the driving unit when the control unit outputs a discharge signal or the control unit fails.
6. The active discharge circuit of claim 2, wherein the sampling unit comprises a first resistor, a second resistor and a first capacitor, and the first resistor and the second resistor are connected in series and then connected in parallel to two ends of the dc bus capacitor, and the first capacitor is connected in parallel to the second resistor; and the connection point of the first resistor and the second resistor forms the output end of the sampling unit.
7. The active discharge circuit of claim 4 wherein said comparator unit includes a comparator, and a non-inverting input of said comparator is connected to an output of said signal generating unit, an inverting input of said comparator is connected to an output of said sampling unit, an output of said comparator is connected to an input of said driving unit, and a supply terminal is connected to an output of said high voltage power supply.
8. The active discharge circuit of claim 7 wherein said signal generating subunit comprises a triangular wave generator, and wherein an output of said triangular wave generator is connected to a non-inverting input of said comparator and a supply terminal is connected to an output of said high voltage power supply.
9. The active discharge circuit of claim 5, wherein the discharge unit comprises a resistor group consisting of one or more resistors connected in series, and one end of the resistor group is connected to the output terminal of the high voltage power supply, and the other end is connected to a connection point of the enable terminal of the driving unit and the output terminal of the isolation unit.
10. A power electronic device comprising a circuit board, wherein the active discharge circuit of any of claims 1-9 is disposed on the circuit board.
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| CN201911096280.XA CN110920398A (en) | 2019-11-11 | 2019-11-11 | Active discharge circuit and power electronic equipment |
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| CN113525093A (en) * | 2021-07-08 | 2021-10-22 | 浙江吉利控股集团有限公司 | Active discharge circuit of vehicle motor controller |
| CN114257072A (en) * | 2020-09-24 | 2022-03-29 | 奥迪股份公司 | Control of active discharge of high voltage intermediate circuit |
| WO2022257273A1 (en) * | 2021-06-11 | 2022-12-15 | 精进电动科技股份有限公司 | Protection circuit for active discharge resistor of electric motor controller, and electric motor controller |
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| CN111731102A (en) * | 2020-06-28 | 2020-10-02 | 德尔福科技(苏州)有限公司 | Motor winding active discharge control method based on direct-current voltage feedback control |
| CN111731102B (en) * | 2020-06-28 | 2022-05-31 | 德尔福科技(苏州)有限公司 | Motor winding active discharge control method based on direct-current voltage feedback control |
| CN114257072A (en) * | 2020-09-24 | 2022-03-29 | 奥迪股份公司 | Control of active discharge of high voltage intermediate circuit |
| US11780334B2 (en) | 2020-09-24 | 2023-10-10 | Audi Ag | Control of the active discharge of a high-voltage intermediate circuit |
| WO2022257273A1 (en) * | 2021-06-11 | 2022-12-15 | 精进电动科技股份有限公司 | Protection circuit for active discharge resistor of electric motor controller, and electric motor controller |
| CN113525093A (en) * | 2021-07-08 | 2021-10-22 | 浙江吉利控股集团有限公司 | Active discharge circuit of vehicle motor controller |
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Application publication date: 20200327 |