A three-phase Vienna rectifier filter discharge circuit

Abstract

The invention discloses a three-phase Vienna rectifier filter discharge circuit, and relates to the field of discharge. The three-phase Vienna rectifier filter discharge circuit comprises: a three-phase power supply module, which is used for supplying three-phase electricity; a choke filter module, which is used for filtering interference signals and filtering voltage; a rectifier output module, which is used for outputting direct current and supplying electrical loads; and a built-in switch unit, which constructs a discharge circuit of a filter capacitor when receiving a PWM signal; and a power supply control module, which is used for controlling whether the three-phase power supply module supplies power. Compared with the prior art, the invention has the following beneficial effects: the invention sets a discharge circuit of a filter capacitor between the choke filter module and the rectifier output module, detects whether power is off by a fast trigger module, constructs a discharge circuit of a filter capacitor by a PWM signal module, and quickly transfers the charge of the filter capacitor when power is off, thereby meeting safety regulations and reducing standby power consumption.

Description

Technical Field

[0001] The invention relates to the field of discharge, in particular to a three-phase Vienna rectifier filter discharge circuit. Background Art

[0002] like Figure 1 As shown in the figure, when the live power supply LA, LB, LC are disconnected to power off the input, the filter capacitors C1, C2, C3, C4, C5, and C6 have voltage. The safety regulations require that the capacitors be discharged to below 60V within 1S. Therefore, resistors R1, R2, R3, R4, R5, and R6 need to be connected in parallel to these capacitors to discharge. However, due to the large voltage, parallel resistors will bring about large standby power consumption, which needs to be improved. Summary of the invention

[0003] The object of the present invention is to provide a three-phase Vienna rectifier filter discharge circuit to solve the problems raised in the above background technology.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A three-phase Vienna rectifier filter discharge circuit, comprising:

[0006] Three-phase power supply module, used for supplying three-phase electricity;

[0007] The choke filter module is used to filter interference signals and filter the voltage;

[0008] The rectifier output module is used to output direct current to supply the electrical load; and has a built-in switch unit. When the switch unit receives a PWM signal, a discharge circuit of the filter capacitor is constructed;

[0009] The power supply control module is used to control whether the three-phase power supply module supplies power, and to drive the fast trigger module when the three-phase power supply module stops supplying power;

[0010] Fast trigger module, used to drive the PWM signal module to work;

[0011] PWM signal module, used for outputting PWM signal;

[0012] The output end of the three-phase power supply module is connected to the input end of the choke filter module, the output end of the choke filter module is connected to the first input end of the rectifier output module, the first output end of the power supply control module is connected to the input end of the three-phase power supply module, the second output end of the power supply control module is connected to the input end of the fast trigger module, the output end of the fast trigger module is connected to the input end of the PWM signal module, and the output end of the PWM signal module is connected to the second input end of the rectifier output module.

[0013] As a further solution of the present invention: the three-phase power supply module includes a first power supply, a second power supply, a third power supply, a first switch, a second switch, and a third switch. One end of the first power supply is grounded, and the other end of the first power supply is connected to the input end of the choke filter module through the first switch. One end of the second power supply is grounded, and the other end of the second power supply is connected to the input end of the choke filter module through the second switch. One end of the third power supply is grounded, and the other end of the third power supply is connected to the input end of the choke filter module through the third switch.

[0014] As a further solution of the present invention: the choke filter module includes a first choke, a second choke, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first inductor, a second inductor, and a third inductor. The first end, the second end, and the third end of the first choke are connected to the output end of the three-phase power supply module, the fourth end of the first choke is connected to the first end of the second choke and one end of the third capacitor, the fifth end of the first choke is connected to the second end of the second choke and one end of the second capacitor, the sixth end of the first choke is connected to the third end of the second choke and one end of the first capacitor, and the The other end is connected to the other end of the second capacitor and the other end of the third capacitor, the fourth end of the second choke is connected to one end of the first inductor and one end of the sixth capacitor, the fifth end of the second choke is connected to one end of the second inductor and one end of the fifth capacitor, the sixth end of the second choke is connected to one end of the third inductor and one end of the fourth capacitor, the other end of the fourth capacitor is connected to the other end of the fifth capacitor and the other end of the sixth capacitor, the other end of the first inductor is connected to the first input end of the rectifier output module, the other end of the second inductor is connected to the first input end of the rectifier output module, and the other end of the third inductor is connected to the first input end of the rectifier output module.

[0015] As a further solution of the present invention: the rectifier output module includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, three switch units, a seventh capacitor, and an eighth capacitor. The positive electrode of the first diode is connected to the negative electrode of the fourth diode, one end of the first switch unit, and the output end of the choke filter module. The positive electrode of the second diode is connected to the negative electrode of the fifth diode, one end of the second switch unit, and the output end of the choke filter module. The positive electrode of the third diode is connected to the negative electrode of the sixth diode, one end of the third switch unit, and the output end of the choke filter module. The other end of the first switch unit is connected to the other end of the second switch unit, the other end of the third switch unit, one end of the seventh capacitor, and one end of the eighth capacitor. The negative electrode of the first diode is connected to the negative electrode of the second diode, the negative electrode of the third diode, and the other end of the seventh capacitor. The positive electrode of the fourth diode is connected to the positive electrode of the fifth diode, the positive electrode of the sixth diode, and the other end of the eighth capacitor.

[0016] As a further solution of the present invention: the switch unit includes a fourth MOS tube and a fifth MOS tube, the S pole of the fourth MOS tube is connected to the S pole of the fifth MOS tube, the G pole of the fourth MOS tube is connected to the G pole of the fifth MOS tube and the PWM signal, and the D pole of the fourth MOS tube and the D pole of the fifth MOS tube serve as external interfaces.

[0017] As a further solution of the present invention: the power supply control module includes a fourth switch, a first relay, and a seventh diode, one end of the fourth switch is connected to the supply voltage, the other end of the fourth switch is connected to one end of the first relay, the cathode of the seventh diode, and the input end of the fast unless module, the other end of the first relay is grounded, and the anode of the seventh diode is grounded.

[0018] As a further solution of the present invention: the fast trigger module includes a first resistor, a first triode, a second triode, a third triode, an eighth diode, and a second resistor, one end of the first resistor is connected to the power supply voltage, the other end of the first resistor is connected to the emitter of the first triode, the base of the first triode is connected to the second output end of the power supply control module, the collector of the first triode is connected to the cathode of the eighth diode and the emitter of the second triode, the anode of the eighth diode is connected to the base of the third triode, the collector of the second triode, and one end of the second resistor, the base of the second triode is connected to the collector of the third triode, and the emitter of the third triode is connected to the other end of the second resistor and the input end of the PWM signal module.

[0019] As a further solution of the present invention: the PWM signal module includes an inverter, a third resistor, and a ninth capacitor, the power supply end of the inverter is connected to the output end of the fast trigger module, the input end of the inverter is connected to one end of the third resistor and one end of the ninth capacitor, the other end of the ninth capacitor is grounded, and the output end of the inverter is connected to the other end of the third resistor and the second input end of the rectifier output module.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention sets a discharge circuit for the filter capacitor between the choke filter module and the rectifier output module, detects whether the input is powered off through a fast trigger module, and constructs a discharge circuit for the filter capacitor through a PWM signal module, so that the charge of the filter capacitor is quickly transferred when the power is off, which not only meets the safety requirements but also reduces the standby power consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The invention is a circuit diagram of an existing three-phase Vienna rectifier filter discharge circuit.

[0022] Figure 2 The utility model is a circuit diagram of a three-phase Vienna rectifier filter discharge circuit.

[0023] Figure 3It is the circuit diagram of the three-phase power supply module, choke filter module and rectifier output module.

[0024] Figure 4 The circuit diagram of the switch unit.

[0025] Figure 5 This is the circuit diagram of the power supply control module, fast trigger module and PWM signal module. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] See also Figure 2 , a three-phase Vienna rectifier filter discharge circuit, comprising:

[0028] Three-phase power supply module 1, used for supplying three-phase power;

[0029] The choke filter module 2 is used to filter interference signals and filter the voltage;

[0030] The rectifier output module 3 is used to output direct current to supply the electrical load; and has a built-in switch unit, which constructs a discharge loop of the filter capacitor when receiving a PWM signal;

[0031] The power supply control module 4 is used to control whether the three-phase power supply module 1 supplies power, and to drive the fast trigger module 5 when the three-phase power supply module 1 stops supplying power;

[0032] The fast trigger module 5 is used to drive the PWM signal module 6 to work;

[0033] PWM signal module 6, used for outputting PWM signal;

[0034] The output end of the three-phase power supply module 1 is connected to the input end of the choke filter module 2, the output end of the choke filter module 2 is connected to the first input end of the rectifier output module 3, the first output end of the power supply control module 4 is connected to the input end of the three-phase power supply module 1, the second output end of the power supply control module 4 is connected to the input end of the fast trigger module 5, the output end of the fast trigger module 5 is connected to the input end of the PWM signal module 6, and the output end of the PWM signal module 6 is connected to the second input end of the rectifier output module 3.

[0035] In this example: See Figure 3The three-phase power supply module 1 includes a first power supply LA, a second power supply LB, a third power supply LC, a first switch S1, a second switch S2, and a third switch S3. One end of the first power supply LA is grounded, and the other end of the first power supply LA is connected to the input end of the choke filter module 2 through the first switch S1. One end of the second power supply LB is grounded, and the other end of the second power supply LB is connected to the input end of the choke filter module 2 through the second switch S2. One end of the third power supply LC is grounded, and the other end of the third power supply LC is connected to the input end of the choke filter module 2 through the third switch S3.

[0036] The first power supply LA, the second power supply LB, and the third power supply LC output AC power. When the first switch S1, the second switch S2, and the third switch S3 are in a closed state, they supply power to the choke filter module 2. When the first switch S1, the second switch S2, and the third switch S3 are in an open state, they stop supplying power to the choke filter module 2.

[0037] In another embodiment: the first switch S1, the second switch S2, and the third switch S3 of the present invention are controlled by the power supply control module 4 to control closing and opening, and can also be manually controlled.

[0038] In this example: See Figure 3 The choke filter module 2 includes a first choke W1, a second choke W2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a first inductor L1, a second inductor L2, and a third inductor L3. The first end, the second end, and the third end of the first choke W1 are connected to the output end of the three-phase power supply module 1. The fourth end of the first choke W1 is connected to the first end of the second choke W2 and one end of the third capacitor C3. The fifth end of the first choke W1 is connected to the second end of the second choke W2 and one end of the second capacitor C2. The sixth end of the first choke W1 is connected to the third end of the second choke W2 and one end of the first capacitor C1. The other end of the first capacitor C1 The fourth end of the second choke W2 is connected to one end of the first inductor L1 and one end of the sixth capacitor C6, the fifth end of the second choke W2 is connected to one end of the second inductor L2 and one end of the fifth capacitor C5, the sixth end of the second choke W2 is connected to one end of the third inductor L3 and one end of the fourth capacitor C4, the other end of the fourth capacitor C4 is connected to the other end of the fifth capacitor C5 and the other end of the sixth capacitor C6, the other end of the first inductor L1 is connected to the first input end of the rectifier output module 3, the other end of the second inductor L2 is connected to the first input end of the rectifier output module 3, and the other end of the third inductor L3 is connected to the first input end of the rectifier output module 3.

[0039] The input alternating current is filtered through the first choke W1 and the second choke W2 to filter the electromagnetic interference signal, and is filtered through the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6, the first inductor L1, the second inductor L2, and the third inductor L3, and is output to the rectifier output module 3 after voltage processing.

[0040] In another embodiment, a resistor may be provided to assist in discharging the filter capacitor.

[0041] In this example: See Figure 3 The rectifier output module 3 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, a sixth diode D6, three switch units, a seventh capacitor C7, and an eighth capacitor C8. The anode of the first diode D1 is connected to the cathode of the fourth diode D4, one end of the first switch unit, and the output end of the choke filter module 2. The anode of the second diode D2 is connected to the cathode of the fifth diode D5, one end of the second switch unit, and the output end of the choke filter module 2. The anode of the third diode D3 is connected to the cathode of the sixth diode D6, one end of the third switch unit, and the output end of the choke filter module 2. The other end of the first switch unit is connected to the other end of the second switch unit, the other end of the third switch unit, one end of the seventh capacitor C7, and one end of the eighth capacitor C8. The cathode of the first diode D1 is connected to the cathode of the second diode D2, the cathode of the third diode D3, and the other end of the seventh capacitor C7. The anode of the fourth diode D4 is connected to the cathode of the fifth diode D5, the cathode of the sixth diode D6, and the other end of the eighth capacitor C8.

[0042] The input voltage is converted into direct current after passing through the rectifier circuit composed of the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, and the sixth diode D6, and then output to supply the power load after filtering through the seventh capacitor C7 and the eighth capacitor C8. Three switch units are provided here to discharge the voltage from the first capacitor C1 to the sixth capacitor C6 after the input power is off, and output to the seventh capacitor C7 and the eighth capacitor C8.

[0043] In another embodiment: the present invention corresponds to three-phase electricity processing, and if it is single-phase electricity, a single switch unit can also be set to perform pressure relief processing.

[0044] In this example: See Figure 4 The switch unit includes a fourth MOS tube V4 and a fifth MOS tube V5, the S pole of the fourth MOS tube V4 is connected to the S pole of the fifth MOS tube V5, the G pole of the fourth MOS tube V4 is connected to the G pole of the fifth MOS tube V5 and the PWM signal, and the D pole of the fourth MOS tube V4 and the D pole of the fifth MOS tube V5 serve as an external interface.

[0045] After the input power is off (the first switch S1, the second switch S2, and the third switch S3 are disconnected, and the first power supply LA, the second power supply LB, and the third power supply LC stop supplying power), based on the PWM signal input, the fourth MOS tube V4 and the fifth MOS tube V5 are periodically turned on. When turned on, current flows through the first inductor L1, the second inductor L2, and the third inductor L3. When turned off, based on the characteristic that the inductor current does not change suddenly, the current originally flowing to the BUS0 point flows to the BUS+ point in the figure. During the fast turning on and off of the fourth MOS tube V4 and the fifth MOS tube V5, the voltage on the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, and the sixth capacitor C6 is quickly discharged, which meets the safety requirements and effectively reduces the standby power consumption.

[0046] In another embodiment, the fifth MOS transistor V5 can be omitted. The fifth MOS transistor V5 is used to ensure that the current at BUS0 of the three inductors is the same when the transistor is turned on.

[0047] In this example: See Figure 5 The power supply control module 4 includes a fourth switch S4, a first relay J1, and a seventh diode D7. One end of the fourth switch S4 is connected to the power supply voltage VCC, and the other end of the fourth switch S4 is connected to one end of the first relay J1, the cathode of the seventh diode D7, and the input end of the fast unless module. The other end of the first relay J1 is grounded, and the anode of the seventh diode D7 is grounded.

[0048] When the fourth switch S4 is closed, the first relay J1 is energized and works, controlling the first switch S1, the second switch S2, and the third switch S3 to close, and the input is powered on; when the fourth switch S4 is opened, the first relay J1 stops working, the first switch S1, the second switch S2, and the third switch S3 pop open, and the input is powered off.

[0049] In another embodiment: the present application controls three switches through one relay, and three relays may also be used to control three switches.

[0050] In this example: See Figure 5The fast trigger module 5 includes a first resistor R1, a first triode V1, a second triode V2, a third triode V3, an eighth diode D8, and a second resistor R2. One end of the first resistor R1 is connected to the power supply voltage VCC, the other end of the first resistor R1 is connected to the emitter of the first triode V1, the base of the first triode V1 is connected to the second output end of the power supply control module 4, the collector of the first triode V1 is connected to the cathode of the eighth diode D8 and the emitter of the second triode V2, the anode of the eighth diode D8 is connected to the base of the third triode V3, the collector of the second triode V2, and one end of the second resistor R2, the base of the second triode V2 is connected to the collector of the third triode V3, and the emitter of the third triode V3 is connected to the other end of the second resistor R2 and the input end of the PWM signal module 6.

[0051] When the fourth switch S4 is closed, the first transistor V1 is cut off. After the fourth switch S4 is turned off, the first transistor V1 is turned on, and the eighth diode D8 is turned on, so that the base of the third transistor V3 is at a high level. The third transistor V3 is turned on, and the base voltage of the second transistor V2 is pulled down, so that the second transistor V2 is turned on, and the base voltage of the third transistor V3 is increased, and the base voltage of the second transistor V2 is further reduced. This is repeated, so that the second transistor V2 and the third transistor V3 are quickly turned on to power the PWM signal module 6.

[0052] In another embodiment, the fast trigger module 5 can be omitted. The fast trigger module 5 is used to ensure that the PWM signal module 6 is powered quickly when the input power is off.

[0053] In this example: See Figure 5 The PWM signal module 6 includes an inverter U1, a third resistor R3, and a ninth capacitor C9. The power supply end of the inverter U1 is connected to the output end of the fast trigger module 5. The input end of the inverter U1 is connected to one end of the third resistor R3 and one end of the ninth capacitor C9. The other end of the ninth capacitor C9 is grounded. The output end of the inverter U1 is connected to the other end of the third resistor R3 and the second input end of the rectifier output module 3.

[0054] After the voltage is input, the inverter U1 is powered on and starts working. Initially, the input end of the inverter U1 is at a low level, and the output end of the inverter U1 outputs a high level to charge the ninth capacitor C9 through the third resistor R3. When the ninth capacitor C9 is charged to a high level, the input end of the inverter U1 is at a high level, and the inverter U1 outputs a low level. The ninth capacitor C9 is discharged through the third resistor R3 and becomes a low level again. This is repeated to form a PWM signal to control the conduction status of the switch unit. The power supply control module 4, the driving fast trigger module 5, and the PWM signal module 6 all work at low voltage, so the power consumption is small.

[0055] In another embodiment, other methods may be used to obtain the PWM signal.

[0056] The working principle of the present invention is: the three-phase power supply module 1 is used to supply three-phase electricity; the choke filter module 2 is used to filter interference signals and filter the voltage; the rectifier output module 3 is used to output direct current and supply the power load; and a built-in switch unit is provided, and when the switch unit receives a PWM signal, a discharge circuit of the filter capacitor is constructed; the power supply control module 4 is used to control whether the three-phase power supply module 1 supplies power, and when the three-phase power supply module 1 stops supplying power, it drives the fast trigger module 5; the fast trigger module 5 is used to drive the PWM signal module 6 to work; the PWM signal module 6 is used to output a PWM signal.

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A three-phase Vienna rectifier filter discharge circuit, characterized in that: The three-phase Vienna rectifier filter discharge circuit includes: Three-phase power supply module, used for supplying three-phase electricity; The choke filter module is used to filter interference signals and filter the voltage; The rectifier output module is used to output direct current to supply the electrical load; and has a built-in switch unit. When the switch unit receives a PWM signal, a discharge circuit of the filter capacitor is constructed; The power supply control module is used to control whether the three-phase power supply module supplies power, and to drive the fast trigger module when the three-phase power supply module stops supplying power; Fast trigger module, used to drive the PWM signal module to work; PWM signal module, used for outputting PWM signal; The output end of the three-phase power supply module is connected to the input end of the choke filter module, the output end of the choke filter module is connected to the first input end of the rectifier output module, the first output end of the power supply control module is connected to the input end of the three-phase power supply module, the second output end of the power supply control module is connected to the input end of the fast trigger module, the output end of the fast trigger module is connected to the input end of the PWM signal module, and the output end of the PWM signal module is connected to the second input end of the rectifier output module; The fast trigger module includes a first resistor, a first triode, a second triode, a third triode, an eighth diode, and a second resistor, one end of the first resistor is connected to the power supply voltage, the other end of the first resistor is connected to the emitter of the first triode, the base of the first triode is connected to the second output end of the power supply control module, the collector of the first triode is connected to the cathode of the eighth diode and the emitter of the second triode, the anode of the eighth diode is connected to the base of the third triode, the collector of the second triode, and one end of the second resistor, the base of the second triode is connected to the collector of the third triode, and the emitter of the third triode is connected to the other end of the second resistor and the input end of the PWM signal module; The PWM signal module includes an inverter, a third resistor, and a ninth capacitor. The power supply end of the inverter is connected to the output end of the fast trigger module, the input end of the inverter is connected to one end of the third resistor and one end of the ninth capacitor, the other end of the ninth capacitor is grounded, and the output end of the inverter is connected to the other end of the third resistor and the second input end of the rectifier output module.

2. The three-phase Vienna rectifier filter discharge circuit according to claim 1, characterized in that: The three-phase power supply module includes a first power supply, a second power supply, a third power supply, a first switch, a second switch, and a third switch. One end of the first power supply is grounded, and the other end of the first power supply is connected to the input end of the choke filter module through the first switch. One end of the second power supply is grounded, and the other end of the second power supply is connected to the input end of the choke filter module through the second switch. One end of the third power supply is grounded, and the other end of the third power supply is connected to the input end of the choke filter module through the third switch.

3. The three-phase Vienna rectifier filter discharge circuit according to claim 1, characterized in that: The choke filter module includes a first choke, a second choke, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a first inductor, a second inductor, and a third inductor. The first end, the second end, and the third end of the first choke are connected to the output end of the three-phase power supply module. The fourth end of the first choke is connected to the first end of the second choke and one end of the third capacitor. The fifth end of the first choke is connected to the second end of the second choke and one end of the second capacitor. The sixth end of the first choke is connected to the third end of the second choke and one end of the first capacitor. The other end of the first capacitor is connected to the second The other end of the first capacitor and the other end of the third capacitor, the fourth end of the second choke is connected to one end of the first inductor and one end of the sixth capacitor, the fifth end of the second choke is connected to one end of the second inductor and one end of the fifth capacitor, the sixth end of the second choke is connected to one end of the third inductor and one end of the fourth capacitor, the other end of the fourth capacitor is connected to the other end of the fifth capacitor and the other end of the sixth capacitor, the other end of the first inductor is connected to the first input end of the rectifier output module, the other end of the second inductor is connected to the first input end of the rectifier output module, and the other end of the third inductor is connected to the first input end of the rectifier output module.

4. The three-phase Vienna rectifier filter discharge circuit according to claim 1, characterized in that: The rectifier output module includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode, a sixth diode, three switch units, a seventh capacitor, and an eighth capacitor. The positive electrode of the first diode is connected to the negative electrode of the fourth diode, one end of the first switch unit, and the output end of the choke filter module. The positive electrode of the second diode is connected to the negative electrode of the fifth diode, one end of the second switch unit, and the output end of the choke filter module. The positive electrode of the third diode is connected to the negative electrode of the sixth diode, one end of the third switch unit, and the output end of the choke filter module. The other end of the first switch unit is connected to the other end of the second switch unit, the other end of the third switch unit, one end of the seventh capacitor, and one end of the eighth capacitor. The negative electrode of the first diode is connected to the negative electrode of the second diode, the negative electrode of the third diode, and the other end of the seventh capacitor. The positive electrode of the fourth diode is connected to the positive electrode of the fifth diode, the positive electrode of the sixth diode, and the other end of the eighth capacitor.

5. The three-phase Vienna rectifier filter discharge circuit according to claim 4, characterized in that: The switch unit includes a fourth MOS tube and a fifth MOS tube, the S pole of the fourth MOS tube is connected to the S pole of the fifth MOS tube, the G pole of the fourth MOS tube is connected to the G pole of the fifth MOS tube and a PWM signal, and the D pole of the fourth MOS tube and the D pole of the fifth MOS tube serve as external interfaces.

6. The three-phase Vienna rectifier filter discharge circuit according to claim 1, characterized in that: The power supply control module includes a fourth switch, a first relay, and a seventh diode. One end of the fourth switch is connected to the supply voltage, the other end of the fourth switch is connected to one end of the first relay, the cathode of the seventh diode, and the input end of the fast unless module, the other end of the first relay is grounded, and the anode of the seventh diode is grounded.

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