High-power PFC circuit compatible with three-phase AC input and DC input

Abstract

The invention discloses a high-power PFC circuit compatible with three-phase AC input and DC input, and relates to the technical field of power circuits. Comprising an input end, a relay module, a filtering module, a diode rectification module, a two-phase switch control module and an output capacitor module. The relay module is connected between the input end and the filtering module; the filtering module is connected with the diode rectification module and the bidirectional switch control module. The output capacitor module is connected with the diode rectification module and the two-phase switch control module. The method has the beneficial effects that free switching between three-phase alternating current input and direct current input can be realized, and load reduction is not needed during direct current input, so that full-load power output during charging of the high-power electric vehicle is ensured, the charging efficiency can be improved, and the user experience can be optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of power circuits, and more particularly to a high-power PFC circuit compatible with three-phase AC input and DC input. Background Art

[0002] The working mode of the energy storage and replenishment mobile vehicle is to first convert the three-phase AC input of the mains into DC power through the AC / DC input charging pile module ACDC to charge the energy storage battery of the mobile replenishment vehicle; when the target electric vehicle has a charging demand, it is converted from the energy storage battery of the mobile replenishment vehicle into DC power through the AC / DC input charging pile module DCDC to charge the electric vehicle.

[0003] The working mode of the integrated photovoltaic storage and charging station is to convert the three-phase AC input of the city power into DC power through the AC / DC input charging pile module ACDC when the electricity rate is low in the middle of the night to charge the energy storage battery at a low price; and to convert the energy storage battery into DC power through the AC / DC input charging pile module DCDC when the electricity rate is peak during the day to charge the electric vehicle at a high price.

[0004] In the above application scenarios, the AC / DC input charging pile module is the core component, and the module's front-stage circuit is a high-power PFC circuit that is compatible with three-phase AC input and DC input. Since the three-phase AC input is a three-wire input, and the DC input is a two-wire input, in the DC input working mode, one input power device is not working, resulting in the module being unable to output full power when the DC input is used, and can only be used with reduced load.

[0005] To this end, the present invention provides a high-power PFC circuit compatible with three-phase AC input and DC input, which can realize free switching between the two working modes of three-phase AC input and DC input, and no load reduction is required when DC input is used, so as to ensure full-load power output when charging a high-power electric vehicle, thereby improving the charging efficiency and optimizing the user experience. Summary of the invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides a high-power PFC circuit compatible with three-phase AC input and DC input, which can realize free switching between three-phase AC input and DC input, and no load reduction is required when DC input is used, so as to ensure full load power output when charging a high-power electric vehicle, thereby improving the charging efficiency and optimizing the user experience.

[0007] The technical solution adopted by the present invention to solve the technical problem is: a high-power PFC circuit compatible with three-phase AC input and DC input, and the improvement thereof is that the high-power PFC circuit compatible with three-phase AC input and DC input comprises an input end, a relay module, a filter module, a diode rectifier module, a two-phase switch control module and an output capacitor module; the relay module is connected between the input end and the filter module; the filter module is connected to the diode rectifier module and the two-phase switch control module; the output capacitor module is connected to the diode rectifier module and the two-phase switch control module; The input end includes a first input end, a second input end and a third input end; the relay module includes a first relay and a second relay; the filter module includes a first filter unit, a second filter unit and a third filter unit; the first input end is connected to the first filter unit; the first relay is connected between the first input end, the second input end and the second filter unit; the second relay is connected between the second input end, the third input end and the second filter unit; the third input end is connected to the third filter unit.

[0008] Furthermore, the diode rectifier module includes a first diode rectifier unit, a second diode rectifier unit and a third diode rectifier unit; the first diode rectifier unit, the second diode rectifier unit and the third diode rectifier unit are connected in parallel to each other.

[0009] Furthermore, the dual-phase switch control module includes a first dual-phase switch control unit, a second dual-phase switch control unit and a third dual-phase switch control unit, the first dual-phase switch control unit is connected between the first filtering unit, the first diode rectifier unit and the output capacitor module; the second dual-phase switch control unit is connected between the second filtering unit, the second diode rectifier unit and the output capacitor module; the third dual-phase switch control unit is connected between the third filtering unit, the third diode rectifier unit and the output capacitor module.

[0010] Furthermore, the output capacitor module includes capacitor C101 and capacitor C102, the negative electrode of capacitor C101 is connected to the positive electrode of capacitor C102, the first two-phase switch control unit, the second two-phase switch control unit and the third two-phase switch control unit, and the positive electrode of capacitor C101 and the negative electrode of capacitor C102 are connected in parallel to the two ends of the third diode rectifier unit.

[0011] Furthermore, the second filtering unit includes an inductor L201 and an inductor L202; a first single-pole double-throw switch is arranged inside the first relay; a second single-pole double-throw switch is arranged inside the second relay; the common end of the first single-pole double-throw switch is connected to one end of the inductor L201, and the switching end of the first single-pole double-throw switch is connected between the first input end and the second input end; the common end of the second single-pole double-throw switch is connected to one end of the inductor L202, and the switching end of the second single-pole double-throw switch is connected between the second input end and the third input end; the other end of the inductor L201 and the other end of the inductor L202 are both connected to the second diode rectifier unit and the second two-phase switch control unit.

[0012] Furthermore, the first filtering unit includes an inductor L101 and an inductor L102, one end of the inductor L101 and one end of the inductor L102 are both connected to the first input end; the other end of the inductor L102 and the other end of the inductor L102 are both connected to the first diode rectifier unit and the first dual-phase switch control unit.

[0013] Furthermore, the third filtering unit includes an inductor L301 and an inductor L302, one end of the inductor L301 and one end of the inductor L302 are both connected to the third input terminal, and the other end of the inductor L301 and the other end of the inductor L302 are both connected to the third diode rectifier unit and the third dual-phase switch control unit.

[0014] Further, the second diode rectifier unit includes a diode D201, a diode D202, a diode D203 and a diode D204; the second dual-phase switch control unit includes a MOS transistor Q201, a MOS transistor Q202, a MOS transistor Q203 and a MOS transistor Q204; the diode D201, the diode D202, the diode D203 and the diode D204 are connected in a closed loop; the source of the MOS transistor Q201 is connected to the source of the MOS transistor Q202, The drain of the MOS tube Q201 is connected to the other end of the inductor L201, the anode of the diode D201 and the cathode of the diode D202, the drain of the MOS tube Q202 is connected to the drain of the MOS tube Q204, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS tube Q203 is connected to the source of the MOS tube Q204, the drain of the MOS tube Q203 is connected to the other end of the inductor L202, the anode of the diode D203 and the cathode of the diode D204.

[0015] Further, the first diode rectifier unit includes a diode D101, a diode D102, a diode D103 and a diode D104; the first dual-phase switch control unit includes a MOS transistor Q101, a MOS transistor Q102, a MOS transistor Q103 and a MOS transistor Q104; the diode D101, the diode D102, the diode D103 and the diode D104 are connected in a closed loop; the source of the MOS transistor Q101 is connected to the source of the MOS transistor Q102, and the MOS transistor Q103 is connected to the source of the MOS transistor Q104. The drain of the MOS tube Q101 is connected to the other end of the inductor L101, the anode of the diode D101 and the cathode of the diode D102, the drain of the MOS tube Q102 is connected to the drain of the MOS tube Q104, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS tube Q103 is connected to the source of the MOS tube Q104, the drain of the MOS tube Q103 is connected to the other end of the inductor L102, the anode of the diode D103 and the cathode of the diode D104.

[0016] Further, the third diode rectifier unit includes a diode D301, a diode D302, a diode D303 and a diode D304; the third dual-phase switch control unit includes a MOS tube Q301, a MOS tube Q302, a MOS tube Q303 and a MOS tube Q304; the diode D301, the diode D302, the diode D303 and the diode D304 are connected in a closed loop; the source of the MOS tube Q301 is connected to the source of the MOS tube Q302, and the MOS tube Q303 is connected to the source of the MOS tube Q304. The drain of the MOS tube Q301 is connected to the other end of the inductor L301, the anode of the diode D301 and the cathode of the diode D302, the drain of the MOS tube Q302 is connected to the drain of the MOS tube Q304, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS tube Q303 is connected to the source of the MOS tube Q304, the drain of the MOS tube Q303 is connected to the other end of the inductor L302, the anode of the diode D303 and the cathode of the diode D304.

[0017] The beneficial effects of the present invention are as follows: the present invention can be applied to the switching of two working modes of three-phase input and DC input by designing a first relay between the first input end, the second input end and the second filtering unit and designing a second relay between the second input end, the third input end and the second filtering unit. When three-phase AC power is input, the first input end, the second input end and the third input end all have AC power input, and the second input end is connected to the second filtering unit through the first relay and the second relay; at this time, the circuit is a circuit structure of a three-phase staggered Vienna PFC; when DC power is input, only the first input end and the third input end have DC power input, and the second input end is connected to the second filtering unit through the first relay and the second relay. The first relay and the second relay are disconnected from the second filtering unit, and the second filtering unit and the diode rectifier module and the bidirectional switch control module connected to the second filtering unit are respectively connected to the circuit structure of the first input end and the second input end. At this time, the circuit is switched to a three-level BOOST circuit structure in which the upper three paths and the lower three paths are staggered in series, and no circuit components of the PFC circuit are idle during DC input; therefore, the present invention can realize free switching between two working modes of three-phase AC input and DC input, and there is no need to reduce the load during DC input to ensure full-load power output when charging a high-power electric vehicle, thereby improving the charging efficiency and optimizing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A block diagram of a high-power PFC circuit compatible with three-phase AC input and DC input according to the present invention; Figure 2 A circuit connection diagram of a high-power PFC circuit compatible with three-phase AC input and DC input according to the present invention Figure 1 ; Figure 3 A circuit connection diagram of a high-power PFC circuit compatible with three-phase AC input and DC input according to the present invention Figure 2 . DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0020] The following will clearly and completely describe the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships involved in the patent do not refer to the direct connection of components, but refer to the formation of a better connection structure by adding or reducing connection accessories according to the specific implementation situation. The various technical features in the invention can be combined interchangeably without conflicting with each other.

[0021] Reference Figure 1 As shown, the present invention discloses a high-power PFC circuit compatible with three-phase AC input and DC input, and the high-power PFC circuit compatible with three-phase AC input and DC input includes an input end, a relay module, a filter module, a diode rectifier module, a two-phase switch control module and an output capacitor module; the relay module is connected between the input end and the filter module; the filter module is connected to the diode rectifier module and the two-way switch control module; the output capacitor module is connected to the diode rectifier module and the two-phase switch control module; the input end includes a first input end, a second input end and a third input end; the relay module includes a first relay and a second relay; the filter module includes a first filter unit, a second filter unit and a third filter unit; the first input end is connected to the first filter unit; the first relay is connected between the first input end, the second input end and the second filter unit; the second relay is connected between the second input end, the third input end and the second filter unit; the third input end is connected to the third filter unit.

[0022] It should be noted that, in this embodiment, the input end is used to connect direct current or three-phase alternating current to the entire PFC circuit. Specifically, the input end includes a first input end, a second input end, and a third input end. When the PFC circuit is connected to direct current, it is connected through the first input end and the third input end, and the second input end is left floating; when the PFC circuit is connected to three-phase alternating current, it is connected through the first input end, the second input end, and the third input end; the relay module is used to switch the working mode of the PFC circuit to adapt to the direct current / three-phase alternating current connected to the input end. Specifically, the relay module includes a first relay and a second relay. When the input end is connected to direct current, the first relay is used to conduct the first The input terminal and the second filtering unit, the second relay is used to conduct the third input terminal and the second filtering unit; when the input terminal is connected to three-phase AC power, the first relay and the second relay are used to conduct the second input terminal and the second filtering unit; the filtering circuit is used to filter out high-frequency noise and fluctuations in the input power supply to ensure a stable power supply signal; the diode rectifier module is used to convert the input AC signal into a DC signal to provide a suitable power supply for the two-phase switch control module; the two-phase switch control module is used to control the current flow through PWM modulation to ensure the stability of the output voltage and reduce the current ripple through the staggered phase working mode; the output capacitor module is used to store and stabilize electrical energy and provide smooth DC output voltage, specifically, the output capacitor module includes a capacitor C101 and a capacitor C102, the negative electrode of the capacitor C101 is connected to the positive electrode of the capacitor C102 and the two-phase switch control module, and the positive electrode of the capacitor C101 and the negative electrode of the capacitor C102 are connected in parallel to the two ends of the third diode rectifier unit; when the present invention is specifically implemented, when three-phase AC power is connected to the PFC circuit, the first input end, the second input end and the third input end are all input with AC power, and the second input end is connected with the second filter unit through the first relay and the second relay. At this time, the entire PFC circuit is a circuit structure of a three-phase staggered Vienna PFC; when DC power is input, only the first input end and the third input end have DC power. Input, the second input end is disconnected from the second filtering unit through the first relay and the second relay, and the second filtering unit and the diode rectifier module and the bidirectional switch control module connected to the second filtering unit are respectively connected to the circuit structure of the first input end and the second input end. At this time, the entire PFC circuit is switched to a three-level BOOST circuit structure in which the upper three paths and the lower three paths are staggered in series, and no circuit components of the PFC circuit are idle during DC input. Therefore, this embodiment can realize free switching between two working modes of three-phase AC input and DC input, and there is no need to reduce the load during DC input to ensure full-load power output when charging a high-power electric vehicle, thereby improving the charging efficiency and optimizing the user experience.

[0023] The diode rectifier module includes a first diode rectifier unit, a second diode rectifier unit and a third diode rectifier unit; the first diode rectifier unit, the second diode rectifier unit and the third diode rectifier unit are connected in parallel with each other; wherein, referring to Figure 2 and Figure 3 As shown, the first diode rectifier unit includes a diode D101, a diode D102, a diode D103 and a diode D104; the diode D101, the diode D102, the diode D103 and the diode D104 are connected in a closed loop; the second diode rectifier unit includes a diode D201, a diode D202, a diode D203 and a diode D204; the diode D201, the diode D202, the diode D203 and the diode D204 are connected in a closed loop; the third diode rectifier unit includes a diode D301, a diode D302, a diode D303 and a diode D304; the diode D301, the diode D302, the diode D303 and the diode D304 are connected in a closed loop; It should be noted that, in the present embodiment, the diode rectifier module is used to rectify the AC signal into a unidirectional current through the forward conduction characteristics of the diode. Specifically, the diode rectifier module includes a first diode rectifier unit, a second diode rectifier unit and a third diode rectifier unit. The first diode rectifier unit is used to rectify the AC power input to the first input end, the second diode rectifier unit is used to rectify the AC power input to the second input end, and the third diode rectifier unit is used to rectify the AC power input to the third input end.

[0024] The dual-phase switch control module includes a first dual-phase switch control unit, a second dual-phase switch control unit and a third dual-phase switch control unit. The first dual-phase switch control unit is connected between the first filtering unit, the first diode rectifier unit and the output capacitor module; the second dual-phase switch control unit is connected between the second filtering unit, the second diode rectifier unit and the output capacitor module; the third dual-phase switch control unit is connected between the third filtering unit, the third diode rectifier unit and the output capacitor module.

[0025] It should be noted that, in this embodiment, the first two-phase switch control unit, the second two-phase switch control unit and the third two-phase switch control unit are intended to form a three-phase interleaved Vienna PFC circuit under the three-phase AC input working mode, and to form a series interleaved BOOST circuit structure under the DC input working mode, so as to effectively reduce the input and output current ripple.

[0026] Reference Figure 2 and Figure 3As shown, the second filtering unit includes an inductor L201 and an inductor L202; a first single-pole double-throw switch K101 is provided inside the first relay; a second single-pole double-throw switch K102 is provided inside the second relay; a common end of the first single-pole double-throw switch K101 is connected to one end of the inductor L201, and a switching end of the first single-pole double-throw switch K101 is connected between the first input end and the second input end; a common end of the second single-pole double-throw switch K102 is connected to one end of the inductor L202, and a switching end of the second single-pole double-throw switch K102 is connected between the second input end and the third input end; the other end of the inductor L201 and the other end of the inductor L202 are both connected to The second diode rectifier unit is connected to the second two-phase switch control unit; the first filtering unit includes an inductor L101 and an inductor L102, one end of the inductor L101 and one end of the inductor L102 are both connected to the first input end; the other end of the inductor L102 and the other end of the inductor L102 are both connected to the first diode rectifier unit and the first two-phase switch control unit; the third filtering unit includes an inductor L301 and an inductor L302, one end of the inductor L301 and one end of the inductor L302 are both connected to the third input end, and the other end of the inductor L301 and the other end of the inductor L302 are both connected to the third diode rectifier unit and the third two-phase switch control unit.

[0027] It should be noted that, in this embodiment, the first single-pole double-throw switch K101 and the second single-pole double-throw switch K102 are designed to adapt to the two situations where the PFC circuit is connected to three-phase AC power and DC power. Figure 2 As shown, when the PFC circuit is connected to three-phase AC power, the first relay conducts the second input terminal and the inductor L201 through the first single-pole double-throw switch K101, and the second relay conducts the second input terminal and the inductor L202 through the second single-pole double-throw switch K102; refer to Figure 3 As shown, when the PFC circuit is connected to direct current, the first relay conducts the first input terminal and the inductor L201 through the first single-pole double-throw switch K101, and the second relay conducts the third input terminal and the inductor L202 through the second single-pole double-throw switch K102; in the above two cases, the inductor L101, the inductor L102, the inductor L201, the inductor L202, the inductor L301, and the inductor L302 are not idle, and there is no need to reduce the load when direct current is input, ensuring the full load power output when the high-power electric vehicle is charged, thereby improving the charging efficiency and optimizing the user experience.

[0028] It should also be noted that, in this embodiment, Figure 2 As shown, when the PFC circuit is connected to a three-phase AC power, the first input terminal is Va, the second input terminal is Vb, and the third input terminal is Vc; Figure 3As shown, when the PFC circuit takes into account direct current, the first input terminal is Vdc+, and the third input terminal is Vdc-.

[0029] Reference Figure 2 and Figure 3 As shown, the second dual-phase switch control unit includes a MOS tube Q201, a MOS tube Q202, a MOS tube Q203 and a MOS tube Q204; the source of the MOS tube Q201 is connected to the source of the MOS tube Q202, the drain of the MOS tube Q201 is connected to the other end of the inductor L201, the anode of the diode D201 and the cathode of the diode D202, the drain of the MOS tube Q202 is connected to the drain of the MOS tube Q204, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the The source of the MOS tube Q101 is connected to the source of the MOS tube Q102, the drain of the MOS tube Q101 is connected to the other end of the inductor L101, the anode of the diode D101 and the cathode of the diode D102. The drain of the MOS tube Q102 is connected to the drain of the MOS tube Q104, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS tube Q103 is connected to the source of the MOS tube Q104, the drain of the MOS tube Q103 is connected to the other end of the inductor L102, the anode of the diode D103 and the cathode of the diode D104; the third dual-phase switch control unit includes a MOS tube Q301, a MOS tube Q302, a MOS tube Q303 and a MOS tube Q304; the MOS tube Q301 The source of the MOS tube Q303 is connected to the source of the MOS tube Q304, the drain of the MOS tube Q303 is connected to the other end of the inductor L302, the anode of the diode D301 and the cathode of the diode D302, the drain of the MOS tube Q302 is connected to the drain of the MOS tube Q304, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS tube Q303 is connected to the source of the MOS tube Q304, the drain of the MOS tube Q303 is connected to the other end of the inductor L302, the anode of the diode D303 and the cathode of the diode D304.

[0030] It should be noted that, in the present embodiment, when the PFC circuit is connected to three-phase AC power, the first relay controls the first single-pole double-throw switch K101 to conduct the second input terminal and the inductor L201, and the second relay controls the second single-pole double-throw switch K102 to conduct the second input terminal and the inductor L202; at this time, the driving phases of the branch formed by the MOS tube Q101 and the MOS tube Q102 and the branch formed by the MOS tube Q103 and the MOS tube Q104 are staggered at 180°, and the driving phases of the branch formed by the MOS tube Q201 and the MOS tube Q202 and the branch formed by the MOS tube Q203 and the MOS tube Q204 are staggered at 180°. The drive of the branch composed of the MOS tube Q301 and the MOS tube Q302 and the branch composed of the MOS tube Q303 and the MOS tube Q304 is staggered at 180 degrees to form a conventional three-phase staggered Vienna PFC circuit structure; when the PFC circuit is connected to direct current, the first relay controls the first single-pole double-throw switch K101 to turn on the first input terminal and the inductor L201, and the second relay controls the second single-pole double-throw switch K102 to turn on the third input terminal and the inductor L202. At this time, the MOS tube Q101, the MOS tube Q102, the MOS tube Q103, the MOS tube Q104, the MOS tube The driving phases of the MOS transistors Q201 and Q202 are the same, and the driving phases of the MOS transistors Q301, Q302, Q303, Q304, Q203, and Q204 are the same, and the driving phase of the branch formed by the MOS transistors Q101, Q102, Q103, Q104, Q201, and Q202 is the same as the driving phase of the branch formed by the MOS transistors Q301, Q302, Q303, Q304, Q203, and Q204. The dynamic phase difference is 180° to form a series interleaved BOOST circuit structure, thereby effectively reducing the current ripple of the input and output; therefore, the first relay and the second relay can realize the free conversion between the conventional three-phase interleaved Vienna PFC circuit structure and the series interleaved BOOST circuit structure by controlling the first single-pole double-throw switch K101 and the second single-pole double-throw switch K102, that is, when the input end inputs three-phase alternating current, the first relay controls the first single-pole double-throw switch K101 to connect the second input end and the inductor L201, and the second relay controls the second single-pole double-throw switch K102 to connect the second input end and the inductor L202;When direct current is input to the input terminal, the first relay controls the first single-pole double-throw switch K101 to connect the first input terminal and the inductor L201, and the second relay controls the second single-pole double-throw switch K102 to connect the third input terminal and the inductor L202; and when direct current is input, only the first input terminal and the third input terminal are used as the input terminals of direct current, and the second input terminal is suspended. The inductor L201, inductor L202, MOS tube Q201, MOS tube Q202, MOS tube Q203 and MOS tube Q204, which were originally connected to the second input terminal when alternating current is input, are not idle, and are connected to the series-interleaved BOOST circuit structure formed when direct current is input, and can also participate in power conversion, ensuring full power output without load reduction when direct current is input; to ensure full load power output when high-power electric vehicles are charged, thereby improving charging efficiency and optimizing user experience. ;

[0031] The above is a specific description of the preferred implementation of the present invention, but the invention is not limited to the embodiments. Those skilled in the art can make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A high-power PFC circuit compatible with three-phase AC input and DC input, characterized in that: The high-power PFC circuit compatible with three-phase AC input and DC input includes an input end, a relay module, a filter module, a diode rectifier module, a two-phase switch control module and an output capacitor module; the relay module is connected between the input end and the filter module; the filter module is connected to the diode rectifier module and the two-phase switch control module; the output capacitor module is connected to the diode rectifier module and the two-phase switch control module; The input end includes a first input end, a second input end and a third input end; the relay module includes a first relay and a second relay; the filter module includes a first filter unit, a second filter unit and a third filter unit; the first input end is connected to the first filter unit; the first relay is connected between the first input end, the second input end and the second filter unit; the second relay is connected between the second input end, the third input end and the second filter unit; the third input end is connected to the third filter unit.

2. A high-power PFC circuit compatible with three-phase AC input and DC input according to claim 1, characterized in that: The diode rectifier module includes a first diode rectifier unit, a second diode rectifier unit and a third diode rectifier unit; the first diode rectifier unit, the second diode rectifier unit and the third diode rectifier unit are connected in parallel.

3. A high-power PFC circuit compatible with three-phase AC input and DC input according to claim 2, characterized in that: The dual-phase switch control module includes a first dual-phase switch control unit, a second dual-phase switch control unit and a third dual-phase switch control unit. The first dual-phase switch control unit is connected between the first filtering unit, the first diode rectifier unit and the output capacitor module; the second dual-phase switch control unit is connected between the second filtering unit, the second diode rectifier unit and the output capacitor module; the third dual-phase switch control unit is connected between the third filtering unit, the third diode rectifier unit and the output capacitor module.

4. A high-power PFC circuit compatible with three-phase AC input and DC input according to claim 3, characterized in that: The output capacitor module includes capacitor C101 and capacitor C102, the negative electrode of the capacitor C101 is connected to the positive electrode of the capacitor C102, the first two-phase switch control unit, the second two-phase switch control unit and the third two-phase switch control unit, and the positive electrode of the capacitor C101 and the negative electrode of the capacitor C102 are connected in parallel to the two ends of the third diode rectifier unit.

5. A high-power PFC circuit compatible with three-phase AC input and DC input according to claim 4, characterized in that: The second filtering unit includes an inductor L201 and an inductor L202; a first single-pole double-throw switch is arranged inside the first relay; a second single-pole double-throw switch is arranged inside the second relay; the common end of the first single-pole double-throw switch is connected to one end of the inductor L201, and the switching end of the first single-pole double-throw switch is connected between the first input end and the second input end; the common end of the second single-pole double-throw switch is connected to one end of the inductor L202, and the switching end of the second single-pole double-throw switch is connected between the second input end and the third input end; the other end of the inductor L201 and the other end of the inductor L202 are both connected to the second diode rectifier unit and the second two-phase switch control unit.

6. A high-power PFC circuit compatible with three-phase AC input and DC input according to claim 4, characterized in that: The first filtering unit includes an inductor L101 and an inductor L102, one end of the inductor L101 and one end of the inductor L102 are both connected to the first input end; the other end of the inductor L102 and the other end of the inductor L102 are both connected to the first diode rectifier unit and the first dual-phase switch control unit.

7. A high-power PFC circuit compatible with three-phase AC input and DC input according to claim 4, characterized in that: The third filtering unit includes an inductor L301 and an inductor L302, one end of the inductor L301 and one end of the inductor L302 are both connected to the third input terminal, and the other end of the inductor L301 and the other end of the inductor L302 are both connected to the third diode rectifier unit and the third dual-phase switch control unit.

8. The high-power PFC circuit compatible with three-phase AC input and DC input according to claim 5, characterized in that: The second diode rectifier unit includes a diode D201, a diode D202, a diode D203 and a diode D204; the second dual-phase switch control unit includes a MOS tube Q201, a MOS tube Q202, a MOS tube Q203 and a MOS tube Q204; the diode D201, the diode D202, the diode D203 and the diode D204 are connected in a closed loop; the source of the MOS tube Q201 is connected to the source of the MOS tube Q202, and the MOS tube Q203 is connected to the source of the MOS tube Q204. The drain of the MOS tube Q201 is connected to the other end of the inductor L201, the anode of the diode D201 and the cathode of the diode D202, the drain of the MOS tube Q202 is connected to the drain of the MOS tube Q204, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS tube Q203 is connected to the source of the MOS tube Q204, the drain of the MOS tube Q203 is connected to the other end of the inductor L202, the anode of the diode D203 and the cathode of the diode D204.

9. The high-power PFC circuit compatible with three-phase AC input and DC input according to claim 6, characterized in that: The first diode rectifier unit includes a diode D101, a diode D102, a diode D103 and a diode D104; the first dual-phase switch control unit includes a MOS tube Q101, a MOS tube Q102, a MOS tube Q103 and a MOS tube Q104; the diode D101, the diode D102, the diode D103 and the diode D104 are connected in a closed loop; the source of the MOS tube Q101 is connected to the source of the MOS tube Q102, and the MOS tube Q103 is connected to the source of the MOS tube Q104. The drain of the MOS transistor Q101 is connected to the other end of the inductor L101, the anode of the diode D101 and the cathode of the diode D102, the drain of the MOS transistor Q102 is connected to the drain of the MOS transistor Q104, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS transistor Q103 is connected to the source of the MOS transistor Q104, the drain of the MOS transistor Q103 is connected to the other end of the inductor L102, the anode of the diode D103 and the cathode of the diode D104.

10. The high-power PFC circuit compatible with three-phase AC input and DC input according to claim 7, characterized in that: The third diode rectifier unit includes a diode D301, a diode D302, a diode D303 and a diode D304; the third dual-phase switch control unit includes a MOS tube Q301, a MOS tube Q302, a MOS tube Q303 and a MOS tube Q304; the diode D301, the diode D302, the diode D303 and the diode D304 are connected in a closed loop; the source of the MOS tube Q301 is connected to the source of the MOS tube Q302, and the MOS tube Q303 is connected to the source of the MOS tube Q304. The drain of the MOS transistor Q301 is connected to the other end of the inductor L301, the anode of the diode D301 and the cathode of the diode D302, the drain of the MOS transistor Q302 is connected to the drain of the MOS transistor Q304, the negative electrode of the capacitor C101 and the positive electrode of the capacitor C102; the source of the MOS transistor Q303 is connected to the source of the MOS transistor Q304, the drain of the MOS transistor Q303 is connected to the other end of the inductor L302, the anode of the diode D303 and the cathode of the diode D304.

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