Multiplexed topology structure that simultaneously realizes control of a dual-winding motor and OBC charging

Abstract

The present invention provides a multiplexed topology structure that simultaneously controls a dual-winding motor and charges it with an on-board charger. [Solution] By controlling the on / off state of a specific relay, bidirectional switching between the control topology of a dual-winding motor and the charging topology of an on-board charger is realized. In the dual-winding motor control mode, the topology structure is divided into a battery module, a dual-winding motor power control module 1, a dual-winding motor power control module 2, a dual-winding motor winding module 1, and a dual-winding motor winding module 2, and in the on-board charger charging mode, the topology structure is divided into a commercial power supply module, a PFC inverter circuit module, a reverse conversion module, an isolation transformer module, a rectifier module, and a battery module. The present invention greatly multiplies a set of hardware devices while meeting the functional demands of controlling a dual-winding motor and charging by an on-board charger, saving equipment space and improving on-board charging efficiency, while having sufficient cost benefits.

Description

[Technical field]

[0001] The present invention relates to the field of motor control and on-board charging devices, and more particularly to a multiplexed topology structure that simultaneously realizes control of a dual-winding motor and charging of an on-board charger (OBC). [Background technology]

[0002] In recent years, countries around the world have been continuously promoting the development of clean energy and green transportation to cope with the worsening energy crisis and environmental pollution problems. The automobile industry is facing a transformation, and electric vehicles have become an important direction in the development of modern automobiles, and many countries are also actively promoting the popularization of electric vehicles. In this transformation transition period, how to efficiently charge electric vehicles is an important issue to resolve users' mileage concerns.

[0003] At present, charging of electric vehicles mainly includes two forms: charging at charging stations and on-board chargers. The construction of charging stations is not yet complete. On-board chargers have the advantage of portable charging and can be used as a transitional state before the large-scale application of charging stations is realized.

[0004] Due to the space limitations and cost of electric vehicles, the actual charging efficiency of on-board chargers currently installed in vehicles is not high. In the prior art, many scientists have made many studies on optimizing on-board chargers and have achieved some results, but there is still a lot of room for improvement.

[0005] In view of the above, it is desirable to provide a new type of on-board charger that can effectively solve the space limitations of electric vehicles, reduce the overall hardware cost, and maximize the charging efficiency. Summary of the Invention [Problem to be solved by the invention]

[0006] The objective of the present invention is to address the shortcomings of the prior art by providing a multiplexing topology structure that simultaneously realizes the control of a dual-winding motor and charging by an on-board charger, which multiplexes a set of hardware devices to a very large extent, meets the functional demands of the control of a dual-winding motor and charging by an on-board charger, saves equipment space, and has substantial cost advantages. [Means for solving the problem]

[0007] The object of the present invention is achieved by the following solutions: The present invention provides a multiplexed topology structure that simultaneously realizes control of a dual-winding motor and charging by an on-board charger.

[0008] In the dual winding motor control mode, the multiplexed topology structure is divided into a battery module, a dual winding motor power control module 1, a dual winding motor power control module 2, a dual winding motor winding module 1, and a dual winding motor winding module 2.

[0009] In the battery module, two paths are drawn out from both the positive and negative electrodes of the battery BAT. One path of the positive electrode HV+ is connected to the upper end of the first capacitor C1 in the dual-winding motor power control module 1 via the first switch K1, and a connection point 1 is drawn out and connected to the sixth switch K6 of the dual-winding motor power control module 2, while the other path of the positive electrode HV+ is directly connected to the upper end of the second capacitor C2 in the dual-winding motor power control module 2. One path of the negative electrode HV- is connected to the lower end of the first capacitor C1 in the dual-winding motor power control module 1 via the second switch K2, and a connection point 2 is drawn out and connected to the tenth switch K10 of the dual-winding motor power control module 2, while the other path of the negative electrode HV- is directly connected to the lower end of the second capacitor C2 in the dual-winding motor power control module 2.

[0010] In the dual winding motor power control module 1, the upper and lower ends of the first capacitor C1 are connected to the upper and lower ends of the three-phase inverter circuit arm. The basic unit of each phase arm is configured by connecting a power switching transistor and a free wheel diode. The basic unit UT1 is a U-phase upper arm, and the basic unit UB1 is a U-phase lower arm, and the two groups of units are connected to each other. The midpoint of the U-phase arm is connected to the one-phase winding La1 in the dual winding motor winding module 1. The basic unit VT1 is a V-phase upper arm, and the basic unit VB1 is a V-phase lower arm, and the two groups of units are connected to each other, and the midpoint of the V-phase arm is connected to the one-phase winding Lb1 in the dual winding motor winding module 1. The basic unit WT1 is a W-phase upper arm, and the basic unit WB1 is a W-phase lower arm, and the two groups of units are connected to each other, and the midpoint of the W-phase arm is connected to the one-phase winding Lc1 in the dual winding motor winding module 1.

[0011] In the dual-winding motor winding module 1, the three-phase windings La1, Lb1, and Lc1 are connected in a star-connection manner, and double-pole double-throw switches (K3, K4) are arranged on the link connecting the winding La1 and the midpoint of the star. The third switch K3 controls the connection between the winding La1 and the midpoint of the star, and the fourth switch K4 controls the connection between the winding La1 and a connection point N, which is connected to the N end of the commercial power supply module AC. The three-phase windings La1, Lb1, and Lc1 of the dual-winding motor winding module 1 have the same electrical resistance and inductance characteristics. The fourth switch K4 and the seventh switch K7 are controlled to be off, thereby cutting off the input to the commercial power supply module.

[0012] In the dual-winding motor power control module 2, the upper and lower ends of the second capacitor C2 are connected to the upper and lower ends of the three-phase inverter circuit arm. The basic unit of each phase arm is configured by connecting a power switching transistor and a free wheel diode. The basic unit UT2 is the U-phase upper arm, and the basic unit UB2 is the U-phase lower arm. The two groups of units are connected to each other, and double-pole double-throw switches (K5, K6) are arranged at the upper ends of the U-phase arms. The fifth switch K5 controls the connection between the upper end of the U-phase upper arm UT2 and the upper end of the second capacitor C2, the sixth switch K6 controls the connection between the upper end of the U-phase upper arm UT2 and the connection point 1, and double-pole double-throw switches (K9, K10) are arranged at the lower ends of the U-phase arms, and the ninth switch K9 controls the connection between the lower end of the U-phase lower arm UB2 and the second capacitor C2. A seventh switch K7 controls the connection between the midpoint of the U-phase arm and connection point L, and connection point L is connected to the L end of the commercial power supply module AC. An eighth switch K8 controls the connection between the midpoint of the U-phase arm and the single-phase winding La2 in the dual-winding motor winding module 2. The basic unit VT2 is the V-phase upper arm, and the basic unit VB2 is the V-phase lower arm. The two groups of units are connected to each other, and the midpoint of the V-phase arm is connected to the single-phase winding Lb2 in the dual-winding motor winding module 2. The basic unit WT2 is the W-phase upper arm, and the basic unit WB2 is the W-phase lower arm. The two groups of units are connected to each other, and the midpoint of the W-phase arm is connected to the one-phase winding Lc2 in the double-winding motor winding module 2.

[0013] In the dual-winding motor winding module 2, the three-phase windings La2, Lb2, and Lc2 are connected in a star connection. The three-phase windings La2, Lb2, and Lc2 of the dual-winding motor winding module 2 have the same electrical resistance and inductance characteristics. The three-phase windings in the dual-winding motor winding module 1 and the three-phase windings in the dual-winding motor winding module 2 have different numbers of turns, which are used to control the switching of the ratio of the number of turns between the primary and secondary sides of the isolation transformer module in the on-board charger charging mode, and realize the boost function of the isolation transformer module.

[0014] In the charging mode of the on-board charger, the multiplexed topology structure is divided into a commercial power supply module, a PFC inverter circuit module, a reverse conversion module, an isolation transformer module, a rectifier module, and a battery module.

[0015] In the commercial power supply module, the N terminal is connected to the winding La1 in the PFC inverter circuit module via a fourth switch K4, and the L terminal is connected to the midpoint of the second arm in the PFC inverter circuit module via a seventh switch K7. The connection point L is connected to the L terminal of the commercial power supply module AC, and the connection point N is connected to the N terminal of the commercial power supply module AC.

[0016] In the PFC inverter circuit module, in the multiplexed dual winding motor control mode, the winding La1 in the dual winding motor winding module 1 and the winding La2 in the dual winding motor winding module 2 are separated from the star connection by controlling the third switch and the eighth switch to be off, respectively. The winding La1 in the dual winding motor winding module 1 is a resistance-inductance element, and further includes U-phase upper and lower arms UT1 and UB1 in the dual winding motor power control module 1, U-phase upper and lower arms UT2 and UB2 in the dual winding motor power control module 2, and a first capacitor C1 in the dual winding motor power control module 1, and the upper and lower ends of the two-phase arms (U-phase in the dual winding motor power control module 1, U-phase in the dual winding motor power control module 2) are both connected to the upper and lower ends of the first capacitor C1.

[0017] The inverter module includes V-phase upper and lower arms VT1 and VB1, and W-phase upper and lower arms WT1 and WB1 in a dual-winding motor power control module 1 in a multiplexed dual-winding motor control mode.

[0018] In the multiplexed dual-winding motor control mode, the isolation transformer module includes a winding Lb1 and a winding Lc1 in the dual-winding motor winding module 1 and a winding Lb2 and a winding Lc2 in the dual-winding motor winding module 2, where the two-phase windings Lb1 and Lc1 are connected in series to form the primary side of the transformer, and the two-phase windings Lb2 and Lc2 are connected in series to form the secondary side of the transformer. The number of turns of the windings is reasonably set to realize the boosting demand of the isolation transformer module. Specifically, the number of turns of the three-phase windings in the dual-winding motor winding module 1 and the three-phase windings in the dual-winding motor winding module 2 are different, which is used to control the switching to the ratio of the number of turns of the primary side and the secondary side of the isolation transformer module in the on-board charger charging mode, thereby realizing the boosting function of the isolation transformer module.

[0019] In a multiplexed dual-winding motor control mode, the rectifier module includes V-phase upper and lower arms VT2 and VB2, W-phase upper and lower arms WT2 and WB2 in the dual-winding motor power control module 2, and a second capacitor C2 in the dual-winding motor power control module 2, and the upper and lower ends of the two-phase (V-phase, W-phase in the dual-winding motor power control module 2) arms are connected to the upper and lower ends of the second capacitor C2.

[0020] In the battery module, the positive and negative poles of the battery in the multiplexed dual-winding motor control mode are connected to the upper and lower ends of the second capacitor C2. Effect of the Invention

[0021] The present invention has the following advantageous effects. (1) The topology structure described in the present invention multiplexes one set of hardware devices to a very large extent, simultaneously realizing the control of a dual-winding motor and the charging function of an on-board charger, and effectively saves the overall layout space. (2) The topology structure described in the present invention realizes the demands of motor control and battery charging simultaneously by multiplexing hardware devices and adding a small number of relay switches, thus greatly reducing the overall cost expenditure. (3) The charging efficiency of the topology structure of the present invention is higher than that of general on-board chargers available on the market. [Brief description of the drawings]

[0022] [Figure 1] FIG. 13 is a topology structure diagram in a dual winding motor control mode. [Diagram 2] FIG. 2 is a topology diagram of an on-board charger in charging mode. [Diagram 3] FIG. 1 is a schematic diagram of the operating conditions of relay control for switching between two modes. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] In the following, the invention will be described in more detail with reference to the drawings.

[0024] The present invention provides a multiplexed topology structure that simultaneously controls a dual-winding motor and charges it with an on-board charger.

[0025] As shown in Figure 1, in the dual winding motor control mode, the multiplexed topology structure includes a battery module, a dual winding motor power control module 1, a dual winding motor winding module 1, a dual winding motor power control module 2, and a dual winding motor winding module 2. The battery module simultaneously drives and controls the dual winding motor winding module 1 and the dual winding motor winding module 2 through the dual winding motor power control module 1 and the dual winding motor power control module 2 respectively.

[0026] In the battery module, two paths are drawn out for both the positive and negative poles of the battery BAT. One path of the positive pole HV+ is connected to the upper end of the first capacitor C1 in the dual winding motor power control module 1 via the first relay K1, and the connection point 1 is drawn out and connected to the sixth relay K6 of the dual winding motor power control module 2, while the other path of the positive pole HV+ is directly connected to the upper end of the second capacitor C2 in the dual winding motor power control module 2. One path of the negative pole HV- is connected to the lower end of the first capacitor C1 in the dual winding motor power control module 1 via the second relay K2, and the connection point 2 is drawn out and connected to the tenth relay K10 of the dual winding motor power control module 2, while the other path of the negative pole HV- is directly connected to the lower end of the second capacitor C2 in the dual winding motor power control module 2. In the dual-winding motor control mode, the first relay K1 and the second relay K2 are controlled to be on, the positive and negative terminals of the battery are connected to the connection points 1 and 2, respectively, and a DC voltage is supplied to the three-phase inverter circuit.

[0027] The dual winding motor power control module 1 is composed of a first capacitor C1 and a three-phase arm, and each phase is divided into two arms, upper and lower, and each arm is formed by connecting a power switching transistor and a freewheeling diode, and the six arms correspond to UT1 and UB1, VT1 and VB1, and WT1 and WB1, respectively, and the midpoints of the three-phase arms are correspondingly connected to the three-phase windings La1, Lb1, and Lc1 of the dual winding motor winding module 1, respectively. By controlling the gate signals of each arm power transistor, the dual winding motor power control module 1 outputs PWM (Pulse Width Modulation) waves to drive the dual winding motor winding module 1.

[0028] The double-winding motor winding module 1 is configured by connecting three-phase symmetrical windings La1, Lb1, and Lc1 in a star configuration. A double-pole double-throw switch (K3, K4) is disposed on the link connecting the winding La1 and the midpoint of the star configuration. The third relay K3 controls the connection between the winding La1 and the midpoint of the star configuration, and the fourth relay K4 controls the connection between the winding La1 and the connection point N. When the fourth relay K4 is turned off and the third relay K3 is turned on, it is ensured that the double-winding motor winding module 1 is operated in the motor drive mode. When the fourth relay K4 and the seventh relay K7 are controlled to be turned off, the input of the commercial power supply module is cut off. The electrical resistance and inductance characteristics of the three-phase windings La1, Lb1, and Lc1 of the double-winding motor winding module 1 are the same.

[0029] In this case, the dual winding motor power control module 2 turns on the fifth relay K5, turns off the sixth relay K6, turns off the seventh relay K7, turns on the eighth relay K8, turns on the ninth relay K9, and turns off the tenth relay K10. In this relay state, the dual winding motor power control module 2 is configured by the second capacitor C2 and a three-phase arm, each phase is divided into two arms, upper and lower, and each arm is configured by connecting a power switching transistor and a freewheeling diode, and the six arms correspond to UT2 and UB2, VT2 and VB2, WT2 and WB2, respectively. The midpoints of the three-phase arms are respectively connected to the three-phase windings La2, Lb2, and Lc2 of the dual winding motor winding module 2, and the dual winding motor power control module 2 outputs a PWM wave to drive the dual winding motor winding module 2 by controlling the gate signals of the power transistors of each arm.

[0030] The dual-winding motor winding module 2 is composed of star-connected three-phase symmetrical windings La2, Lb2, and Lc2, and is controlled by the PWM drive generated from the dual-winding motor winding module 2. The electrical resistance and inductance characteristics of the three-phase windings La2, Lb2, and Lc2 of the dual-winding motor winding module 2 are the same.

[0031] As shown in FIG. 2, in the on-board charger charging mode, the multiplexed topology structure includes a commercial power supply module, a PFC inverter circuit module, a power inversion module, an isolation transformer module, a rectifier module, and a battery module.

[0032] The commercial power supply module has an N terminal connected to the winding La1 in the PFC inverter circuit module via the fourth relay K4, and an L terminal connected to the midpoint of the second arm in the PFC inverter circuit module via the seventh relay K7. In the on-board charger charging mode, the fourth relay K4 and the seventh relay K7 are controlled to be on, and the third relay K3 and the eighth relay K8 are controlled to be off, connecting the N terminal of the commercial power supply to the connection point N and the L terminal of the commercial power supply to the connection point L, thereby realizing power transmission to the PFC inverter circuit.

[0033] The PFC inverter circuit module separates the one-phase winding La1 of the dual-winding motor winding module 1 and the winding La2 of the dual-winding motor winding module 2 from the star connection by controlling the third relay K3 and the eighth relay K8 to be off. The winding La1 in the dual-winding motor winding module 1 is a resistance-inductance element, and further includes U-phase upper and lower arms UT1 and UB1 in the dual-winding motor power control module 1, U-phase upper and lower arms UT2 and UB2 in the dual-winding motor power control module 2, and a first capacitor C1 in the dual-winding motor power control module 1. The sixth relay K6 and the tenth relay K10 are controlled to be on, and the fifth relay K5 and the ninth relay K9 are controlled to be off, thereby connecting the U-phase upper and lower arms of the dual-winding motor power control module 2 to the connection point 1 and the connection point 2, respectively. In this case, UT1 and UB1, and UT2 and UB2 together form a two-phase arm, and the upper and lower ends of the two-phase arm are together connected in parallel to the first capacitor C1, and together realize the inverse conversion boost of PFC (Power Factor Correction).

[0034] The inverter module configures a two-phase arm in cooperation with the V-phase upper and lower arms VT1, VB1 and the W-phase upper and lower arms WT1, WB1 in the dual-winding motor power control module 1, and realizes an inverter function by controlling the gate signals of each power switching transistor, thereby outputting a high-frequency alternating voltage.

[0035] In the isolation transformer module, since the third relay K3 and the eighth relay K8 are turned off, the winding Lb1 and the winding Lc1 in the dual winding motor winding module 1 are automatically connected in series to form the primary side of the transformer, and the winding Lb2 and the winding Lc2 in the dual winding motor winding module 2 are automatically connected in series to form the secondary side of the transformer, and the number of turns of the two groups of windings is reasonably set to realize the transformation function of the isolation transformer. Specifically, the number of turns of the three-phase winding in the dual winding motor winding module 1 and the three-phase winding in the dual winding motor winding module 2 are different, which is used to control the switching to the ratio of the number of turns of the primary side and the secondary side of the isolation transformer module in the on-board charger charging mode, thereby realizing the boost function of the isolation transformer module.

[0036] In the rectification module, the V-phase upper and lower arms VT2, VB2 and the W-phase upper and lower arms WT2, WB2 in the dual-winding motor power control module 2 cooperate to form a two-phase arm, with the upper and lower ends of the two-phase arm respectively connected to both ends of the second capacitor C2. The rectification function is achieved by controlling the gate signals of each power switching transistor, and a DC charging voltage is output to charge the battery.

[0037] The battery module has the positive and negative battery electrodes connected to the upper and lower ends of the second capacitor C2. At this time, the first relay K1 and the second relay K2 are controlled to be turned off, and the battery is structurally connected only to the rectifier module and receives the power output from the rectifier module to charge it.

[0038] As shown in FIG. 3, based on the above multiplexing topology structure, when K1, K2, K3, K5, K8, and K9 are turned off and K4, K6, K7, and K10 are turned on, the mode can be switched to the on-board charger charging mode; when K1, K2, K3, K5, K8, and K9 are turned on and K4, K6, K7, and K10 are turned off, the mode can be switched to the dual winding motor control mode.

[0039] All relay switches involved in the multiplexed topology structure of the present invention can be replaced with any device that has switching attributes.

[0040] The present invention is not limited to the above-mentioned embodiments. Any other embodiments made by those skilled in the art using the same or similar manner as the above-mentioned embodiments of the present invention without inventive steps are included in the protection scope of the present invention.

Claims

1. A multiplexed topology structure that simultaneously realizes control of a dual-winding motor and charging by an on-board charger, In a dual-winding motor control mode, the multiplexing topology structure includes a battery module, a first dual-winding motor power control module, a first dual-winding motor winding module, a second dual-winding motor power control module and a second dual-winding motor winding module, and the battery module is realized to DC drive the first dual-winding motor power control module and the second dual-winding motor power control module through the control operation of the switching elements, and the first dual-winding motor power control module and the second dual-winding motor power control module are further realized to simultaneously PWM drive the first dual-winding motor winding module and the second dual-winding motor winding module, respectively; In a charging mode of the on-board charger, the multiplexed topology structure includes a commercial power supply module, a PFC inverter circuit module, an inverse conversion module, an isolation transformer module, a rectifier module, and a battery module. By controlling the switching elements, the V-phase upper and lower arms and the W-phase upper and lower arms of the first double-winding motor power control module constitute an inverter circuit to realize inverse conversion of the PFC inverter circuit output voltage, the V-phase upper and lower arms and the W-phase upper and lower arms of the second double-winding motor power control module constitute two-phase arms, and the second converter in the second double-winding motor power control module a first double-winding motor winding module connected to a first capacitor to form a rectifier circuit and to realize rectification of the high frequency AC power output from the isolation transformer; by controlling the switching elements, the two-phase windings in the first double-winding motor winding module are connected in series to jointly form the primary side of the isolation transformer, and the two-phase windings in the second double-winding motor winding module are connected in series to jointly form the secondary side of the isolation transformer; and a boost function of the isolation transformer module is realized by arranging the number of turns of the conductor windings of the two groups of three-phase windings.

2. 2. The multiplexed topology structure for simultaneously controlling a dual-winding motor and charging by an on-board charger as claimed in claim 1, characterized in that when the first switch and the second switch are controlled to be on, the battery module is simultaneously connected to the first dual-winding motor power control module and the second dual-winding motor power control module to realize two-path DC drive, and when the fourth switch and the seventh switch are controlled to be off, the input to the commercial power module is cut off.

3. The multiplexed topology structure for simultaneously controlling the dual-winding motor and charging by an on-board charger as claimed in claim 1, characterized in that the first dual-winding motor power control module and the second dual-winding motor power control module form a three-phase inverter circuit structure by controlling the operation of switching elements, and generate a required PWM wave by DC driving of the battery module.

4. The multiplexed topology structure for simultaneously realizing control of the dual-winding motor and charging by an on-board charger as described in claim 1, characterized in that a fifth switch and a ninth switch are placed in one phase arm of the second dual-winding motor power control module and these two switches are controlled to be on, thereby realizing parallel connection of the three-phase inverter arms.

5. 2. The multiplexed topology structure for simultaneously realizing control of a dual-winding motor and charging by an on-board charger according to claim 1, characterized in that a third switch is disposed between the one-phase winding in the first dual-winding motor winding module and the midpoint of the star connection, and an eighth switch is disposed between the midpoint of the one-phase arm in the second dual-winding motor winding module and the one-phase winding in the second dual-winding motor winding module, and by controlling the on / off of these two switches, the winding star connection in the dual-winding motor control mode and the winding series connection in the on-board charger charging mode are used to switch the structures of the primary and secondary sides of the isolation transformer.

6. 2. The multiplexed topology structure for simultaneously controlling a dual-winding motor and charging by an on-board charger as claimed in claim 1, characterized in that a fourth switch is disposed between the one-phase winding in the first dual-winding motor winding module and the midpoint of the star connection, and a seventh switch is disposed between the midpoint of the one-phase arm in the second dual-winding motor winding module and the one-phase winding in the second dual-winding motor winding module, and the input of AC power from a commercial power source in the on-board charger charging mode is realized by controlling these two switches to be on.

7. 2. The multiplexed topology structure for simultaneously controlling a double-winding motor and charging by an on-board charger as claimed in claim 1, characterized in that a sixth switch and a tenth switch are arranged in the one-phase arm of the second double-winding motor power control module, and by controlling the on / off of these two switches, switching between a three-phase inverter bridge formed by a parallel connection of the one-phase arm in the second double-winding motor power control module, the one-phase arm in the first double-winding motor power control module, and the first capacitor, and a PFC inverter circuit bridge structure is realized.

8. By controlling the on / off of the corresponding switching elements, switching between a two-phase arm in a three-phase arm for the inverse conversion output in the first double-winding motor winding module and a bridge circuit structure of the inverse conversion module in the on-board charger charging mode is realized; The multiplexed topology structure for simultaneously realizing control of a dual-winding motor and charging by an on-board charger as claimed in claim 1, characterized in that by controlling the on-off of corresponding switching elements, switching between a two-phase arm in a three-phase arm for an inverse conversion output in the second dual-winding motor winding module and a bridge circuit structure of a rectifier module in an on-board charger charging mode is realized.

9. In dual winding motor control mode, the battery module controls the first switch and the second switch to be on, thereby simultaneously connecting the upper and lower ends of the three-phase arms of the first double-winding motor power control module and the second double-winding motor power control module to simultaneously realize the transmission of DC power; the second double-winding motor power control module controls the fifth switch and the ninth switch to be on, and the sixth switch and the tenth switch to be off, thereby realizing the connection of the three-phase arms in the second double-winding motor power control module, and in addition, controls the seventh switch to be off and the eighth switch to be on, thereby respectively connecting the midpoints of the three-phase arms of the second double-winding motor power control module to the three-phase windings of the second double-winding motor winding module, each arm being formed by connecting a power switching transistor and a freewheeling diode, and controlling the gate of the power switching transistor of each phase arm to realize the output of a PWM wave, the second double-winding motor winding module being formed by star connection of the three-phase windings; 2. The multiplexed topology structure for simultaneously controlling a dual-winding motor and charging by an on-board charger as claimed in claim 1, characterized in that the first dual-winding motor winding module controls the third switch to be on and the fourth switch to be off to realize a star connection of the three-phase windings of the first dual-winding motor winding module.

10. In on-board charger charging mode, the commercial power supply module controls the fourth switch and the seventh switch to be on and the first switch and the second switch to be off, thereby connecting the commercial power supply to both ends of the PFC inverter circuit module to input AC power; 2. The multiplexed topology structure for simultaneously realizing control of a dual-winding motor and charging by an on-board charger as claimed in claim 1, characterized in that the PFC inverter circuit module controls the third switch and the eighth switch to be off to separate one-phase winding of the first dual-winding motor winding module and one-phase winding of the second dual-winding motor winding module from a star connection, and then controls the sixth switch and the tenth switch to be on and the fifth switch and the ninth switch to be off to form a PFC inverter circuit together with the U-phase upper and lower arms and the first capacitor in the first dual-winding motor power control module and the U-phase upper and lower arms in the second dual-winding motor power control module, and realizes a PFC function by controlling the gates of the power switching transistors of each arm.

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