A motor high-power drive and charging integrated system and a control method

Abstract

This invention discloses a high-power motor drive and charging integrated system and control method. The high-power motor drive and charging integrated system includes a battery, a voltage stabilizing capacitor, a charging resistor, a switching component, a first filter inductor, a second filter inductor, a third filter inductor, a first asymmetrical half-bridge circuit, a second asymmetrical half-bridge circuit, a third asymmetrical half-bridge circuit, a first motor winding, a second motor winding, and a third motor winding. When the system is in charging mode, the charging mode includes three-phase charging mode, single-phase charging mode, and DC charging mode. The switching component selects the corresponding filter circuit from the first filter inductor, the second filter inductor, and the third filter inductor according to different charging modes and connects it to the circuit. This invention provides a high-power motor drive and charging integrated system and control method, a low-cost, high-power switched reluctance motor drive and charging integrated system.

Description

A motor high-power drive charging integrated system and control method Technical Field

[0001] The present invention relates to a high-power motor driving and charging integrated system and a control method, and belongs to the field of motors. Background Art

[0002] The motor types commonly used in electric vehicles today are brushless DC motors, three-phase AC motors, and permanent magnet motors. Switched reluctance motors are still in their developmental stages. A comparison of key motor performance reveals that permanent magnet and switched reluctance motors are the two most suitable motors for electric vehicle drives. However, the manufacturing process of permanent magnet motors utilizes costly and non-renewable rare earth resources, which may limit their future development. Therefore, switched reluctance motor drive systems, with their high reliability, high starting torque, and low cost, offer significant competitive advantages.

[0003] Power electronics and electric motors are two of the most critical components in electric vehicle powertrains. Traditionally, they are separate, independent components. Integrating them can achieve higher power density, lower losses, and lower costs in electric drive systems. Advances in compact power electronics and electric motors are also suitable for emerging in-wheel integration solutions.

[0004] Currently, most research on integrated drive and charging for switched reluctance motors (SRMs) focuses on low-power, single-phase AC charging. In practical applications, batteries often have large capacities, while single-phase AC charging offers low power, resulting in charging times of 6-8 hours. This makes it suitable only for slow nighttime charging and unable to meet the needs of electric vehicles for short, daytime, rapid charging. Therefore, research on integrated high-power drive and charging systems for SRMs holds great practical significance.

[0005] Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a high-power motor drive and charging integrated system and control method, a low-cost, high-power switched reluctance motor drive and charging integrated system.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] On one hand, the present invention provides a high-power motor drive and charging integrated system, which includes a battery, a voltage-stabilizing capacitor, a charging resistor, a switching component, a first filter inductor, a second filter inductor, a third filter inductor, a first asymmetric half-bridge circuit, a second asymmetric half-bridge circuit, a third asymmetric half-bridge circuit, a first motor winding, a second motor winding, and a third motor winding;

[0009] The voltage stabilizing capacitor is connected in parallel to the positive and negative electrodes of the battery, and the first asymmetric half-bridge circuit, the second asymmetric half-bridge circuit, and the third asymmetric half-bridge circuit are all connected to the positive and negative electrodes of the battery;

[0010] When the system is in driving mode, the external power supply is not connected to the circuit and the power is supplied by the battery. The first filter inductor, the second filter inductor, and the third filter inductor are all inoperative. The electrical energy of the battery is converted into mechanical energy through the first motor winding, the second motor winding, and the third motor winding.

[0011] When the system is in charging mode, the charging mode includes a three-phase charging mode, a single-phase charging mode and a DC charging mode; the switching component selects a corresponding filter circuit access circuit from the first filter inductor, the second filter inductor and the third filter inductor according to different charging modes, and then reuses the first asymmetric half-bridge circuit, the second asymmetric half-bridge circuit and the third asymmetric half-bridge circuit to charge the battery.

[0012] Furthermore, the input end of the first filter inductor is connected to a first terminal, the input end of the second filter inductor is connected to a second terminal, and the input end of the third filter inductor is connected to a third terminal;

[0013] When the system is in three-phase charging mode, the external power supply is a three-phase AC power supply, the first live wire of the three-phase AC power supply is connected to the first terminal, the second live wire of the three-phase AC power supply is connected to the second terminal, and the third live wire of the three-phase AC power supply is connected to the third terminal;

[0014] When the system is in single-phase charging mode, the external power supply is a single-phase AC power supply, the neutral wire of the single-phase AC power supply is connected to the first terminal, and the live wire of the single-phase AC power supply is connected to the second terminal or the third terminal;

[0015] When the system is in DC charging mode, the external power supply is a DC power supply, the negative electrode of the DC power supply is connected to the first terminal, and the positive electrode of the DC power supply is connected to the second terminal or the third terminal.

[0016] Furthermore, the switching assembly includes a first switching switch, a second switching switch, a third switching switch, a fourth switching switch and a fifth switching switch;

[0017] The input end of the second switch is connected to an external power supply, the output end of the second switch is connected to the input end of the first filter inductor, the output end of the first filter inductor is connected to the first asymmetric half-bridge circuit, the input end of the first switch is connected to the input end of the second switch, and the output end of the first switch is connected to the output end of the first filter inductor;

[0018] An input end of the second filter inductor is connected to an external power supply, and an output end of the second filter inductor is connected to a second asymmetric half-bridge circuit;

[0019] The input end of the fourth switching switch is connected to the external power supply, the output end of the fourth switching switch is connected to the input end of the third filter inductor, the output end of the third filter inductor is connected to the second asymmetric half-bridge circuit, the input end of the third switching switch is connected to the input end of the second filter inductor, the output end of the third switching switch is connected to the input end of the fourth switching switch, the input end of the fifth switching switch is connected to the external power supply, the output end of the fifth switching switch is connected to the input end of the charging resistor, and the output end of the charging resistor is connected to the output end of the third filter inductor.

[0020] Furthermore, the first asymmetric half-bridge circuit includes a first controllable switch device, a second controllable switch device, a first diode and a second diode, one end of the first motor winding is respectively connected to the output end of the first controllable switch device and the negative pole of the first diode, the other end of the first motor winding is respectively connected to the input end of the second controllable switch device and the positive pole of the second diode, the input end of the first controllable switch device and the negative pole of the second diode are both connected to the positive pole of the battery, the output end of the second controllable switch device and the positive pole of the first diode are both connected to the negative pole of the battery, and the output end of the first filter inductor is connected to the input end of the second controllable switch device.

[0021] Furthermore, the second asymmetric half-bridge circuit includes a third controllable switch device, a fourth controllable switch device, a third diode and a fourth diode; one end of the second motor winding is respectively connected to the output end of the third controllable switch device and the negative pole of the third diode; the other end of the second motor winding is respectively connected to the input end of the fourth controllable switch device and the positive pole of the fourth diode; the input end of the third controllable switch device and the negative pole of the fourth diode are both connected to the positive pole of the battery; the output end of the fourth controllable switch device and the positive pole of the third diode are both connected to the negative pole of the battery; and the output end of the second filter inductor is connected to the input end of the fourth controllable switch device.

[0022] Furthermore, the third asymmetric half-bridge circuit includes a fifth controllable switch device, a sixth controllable switch device, a fifth diode and a sixth diode; one end of the third motor winding is respectively connected to the output end of the fifth controllable switch device and the negative pole of the fifth diode; the other end of the third motor winding is respectively connected to the input end of the sixth controllable switch device and the positive pole of the sixth diode; the input end of the fifth controllable switch device and the negative pole of the sixth diode are both connected to the positive pole of the battery; the output end of the sixth controllable switch device and the positive pole of the fifth diode are both connected to the negative pole of the battery; and the output end of the third filter inductor is connected to the input end of the sixth controllable switch device.

[0023] Another aspect of the present invention provides a control method for a high-power motor drive and charging integrated system, comprising:

[0024] Step S1: When the system is in the driving mode, the control methods of the first motor winding, the second motor winding, and the third motor winding are all the same, wherein the control steps of the first motor winding are as follows:

[0025] Step S11: The first controllable switch device and the second controllable switch device of the first asymmetric half-bridge circuit are both turned on, and the battery excites the first motor winding;

[0026] Step S12: The first controllable switch device and the second controllable switch device of the first asymmetric half-bridge circuit are both turned off, and the current on the first motor winding is fed back to the battery through the first diode and the second diode.

[0027] Step S2: When the system is in charging mode, the motor stops working, and the switching component selects the corresponding filter circuit access circuit from the first filter inductor, the second filter inductor, and the third filter inductor according to different charging modes, and then reuses the first asymmetric half-bridge circuit, the second asymmetric half-bridge circuit, and the third asymmetric half-bridge circuit to charge the battery.

[0028] Further, the step S2 includes:

[0029] When the charging mode is three-phase charging, the motor stops working;

[0030] During the pre-charging period, the second switch, the fourth switch, and the fifth switch of the switching component are closed, the first filter inductor, the second filter inductor, the third filter inductor, and the charging resistor are connected to the circuit, the charging resistor is connected in parallel to both ends of the third filter inductor, the first live wire of the external power supply is connected to the first asymmetric half-bridge circuit through the first filter inductor, the second live wire of the external power supply is connected to the second asymmetric half-bridge circuit through the second filter inductor, and the third live wire of the external power supply is connected to the third asymmetric half-bridge circuit through the third filter inductor;

[0031] After pre-charging is completed, the fifth switching switch of the switching component is disconnected, and the charging resistor is removed from the circuit. The first controllable switching device, the second controllable switching device of the first asymmetric half-bridge circuit, the third controllable switching device, the fourth controllable switching device of the second asymmetric half-bridge circuit, and the fifth controllable switching device and the sixth controllable switching device of the third asymmetric half-bridge circuit form a controllable rectifier bridge for rectification, and the battery is charged with constant voltage or constant current.

[0032] Further, the step S2 includes:

[0033] When the charging mode is single-phase charging, the motor stops working;

[0034] During the pre-charging period, the first switch, the third switch, the fourth switch, and the fifth switch of the switching component are closed, the second filter inductor, the third filter inductor, and the charging resistor are connected to the circuit, the charging resistor is connected in parallel to both ends of the third filter inductor, the neutral line of the external power supply is connected to the first asymmetric half-bridge circuit, the live line of the external power supply is connected to the input ends of the second filter inductor and the third filter inductor respectively, the output end of the second filter inductor is connected to the second asymmetric half-bridge circuit, and the output end of the third filter inductor is connected to the third asymmetric half-bridge circuit;

[0035] After pre-charging is completed, the fifth switch of the switching component is disconnected, and the charging resistor is removed from the circuit. The second controllable switch device, the second diode of the first asymmetric half-bridge circuit, the fourth controllable switch device, the fourth diode of the second asymmetric half-bridge circuit, and the sixth controllable switch device and the sixth diode of the third asymmetric half-bridge circuit form an interleaved parallel totem pole bridgeless PFC to perform power factor correction and rectification to charge the battery.

[0036] Further, the step S2 includes:

[0037] When the charging mode is DC charging, the motor stops working;

[0038] During the pre-charging period, the first switch, the third switch, the fourth switch, and the fifth switch of the switching component are closed, the second filter inductor, the third filter inductor, and the charging resistor are connected to the circuit, the charging resistor is connected in parallel across the third filter inductor, the negative electrode of the external power supply is connected to the first asymmetric half-bridge circuit, the positive electrode of the external power supply is connected to the input ends of the second filter inductor and the third filter inductor, respectively, the output end of the second filter inductor is connected to the second asymmetric half-bridge circuit, and the output end of the third filter inductor is connected to the third asymmetric half-bridge circuit;

[0039] After pre-charging is completed, the fifth switching switch of the switching component is disconnected, the charging resistor is removed from the circuit, and the second controllable switching device of the first asymmetric half-bridge circuit, the fourth controllable switching device of the second asymmetric half-bridge circuit, and the sixth controllable switching device of the third asymmetric half-bridge circuit form an interleaved parallel Boost DC / DC circuit to charge the battery.

[0040] By adopting the above technical solution, the present invention reuses the original asymmetric half-bridge circuit of the switched reluctance motor in the charging mode, forming a voltage source PWM rectifier. This can realize DC, single-phase AC, or three-phase AC charging, meeting the different needs of slow charging and fast charging. Based on the reuse of the asymmetric half-bridge circuit, by adding a filter inductor, single-phase or three-phase AC charging and DC charging can be achieved without modifying the existing power converter of the switched reluctance motor. It has a rich charging interface and flexible charging. At the same time, it can provide multiple charging modes such as fast charging and slow charging to meet the charging needs of different application scenarios in life. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] FIG1 is a circuit diagram of a high-power motor drive and charging integrated system according to the present invention;

[0042] FIG2 is a block diagram of the principle of the high-power motor drive and charging integrated system of the present invention;

[0043] FIG3 is an equivalent circuit diagram of the driving mode of the present invention;

[0044] FIG4 is an equivalent circuit diagram of a three-phase charging mode of the present invention;

[0045] FIG5 is an equivalent circuit diagram of a single-phase charging mode of the present invention;

[0046] FIG6 is an equivalent circuit diagram of the DC charging mode of the present invention. DETAILED DESCRIPTION

[0047] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0048] Example 1

[0049] The present invention provides an integrated high-power motor drive and charging system suitable for various applications such as plug-in high-power hybrid vehicles driven by switched reluctance motors. The control of the drive mode adopts the control of the asymmetric half-bridge circuit of a general switched reluctance motor. The rectifier in the charging mode reuses the asymmetric half-bridge circuit of the switched reluctance motor to form a voltage source PWM rectification, which can realize DC or single-phase AC or three-phase AC charging, and can meet the different needs of slow charging and fast charging. By reusing the commonly used topology asymmetric half-bridge of the switched reluctance motor and connecting three inductors, the volume and cost of the entire electric and charging integrated system can be greatly reduced.

[0050] As shown in Figures 1 and 2, the integrated high-power motor drive and charging system provided by the present invention can be used in the field of electric vehicles. It includes a battery, a voltage-stabilizing capacitor C1, a charging resistor R1, a switching component, a first filter inductor L1, a second filter inductor L2, a third filter inductor L3, a first asymmetric half-bridge circuit, a second asymmetric half-bridge circuit, a third asymmetric half-bridge circuit, a first motor winding A, a second motor winding B, and a third motor winding C. The first, second, and third asymmetric half-bridge circuits are all connected to the positive and negative poles of the battery, and the voltage-stabilizing capacitor C1 is connected in parallel with the positive and negative poles of the battery to stabilize the bus voltage.

[0051] When the system is in driving mode, the external power supply is not connected to the circuit and the power is supplied by the battery. The first filter inductor L1, the second filter inductor L2, and the third filter inductor L3 are all non-operating. The battery's electrical energy is converted into mechanical energy through the first motor winding A, the second motor winding B, and the third motor winding C.

[0052] When the system is in charging mode, the charging modes include three-phase charging mode, single-phase charging mode and DC charging mode; the switching component selects the corresponding filter circuit access circuit from the first filter inductor L1, the second filter inductor L2 and the third filter inductor L3 according to different charging modes, and then reuses the first asymmetric half-bridge circuit, the second asymmetric half-bridge circuit and the third asymmetric half-bridge circuit to charge the battery.

[0053] As shown in FIG1 , the input end of the first filter inductor L1 of the present invention is connected to the first terminal P1 , the input end of the second filter inductor L2 is connected to the second terminal P2 , and the input end of the third filter inductor L3 is connected to the third terminal P3 ;

[0054] When the system is in three-phase charging mode, the external power supply is a three-phase AC power supply, the first live wire of the three-phase AC power supply is connected to the first terminal P1, the second live wire of the three-phase AC power supply is connected to the second terminal P2, and the third live wire of the three-phase AC power supply is connected to the third terminal P3;

[0055] When the system is in single-phase charging mode, the external power supply is a single-phase AC power supply, the neutral wire of the single-phase AC power supply is connected to the first terminal P1, and the live wire of the single-phase AC power supply is connected to the second terminal P2 or the third terminal P3;

[0056] When the system is in DC charging mode, the external power supply is a DC power supply, the negative electrode of the DC power supply is connected to the first terminal P1, and the positive electrode of the DC power supply is connected to the second terminal P2 or the third terminal P3.

[0057] As shown in Figure 1, the switching assembly of the present invention includes a first switching switch S1, a second switching switch S2, a third switching switch S3, a fourth switching switch S4, and a fifth switching switch S5. By closing and opening these five switching switches, the filter inductors are selected to be connected to the circuit. The specific connection structure of the five switching switches is as follows:

[0058] The input end of the second switch S2 is connected to the external power supply, the output end of the second switch S2 is connected to the input end of the first filter inductor L1, the output end of the first filter inductor L1 is connected to the first asymmetric half-bridge circuit, the input end of the first switch S1 is connected to the input end of the second switch S2, and the output end of the first switch S1 is connected to the output end of the first filter inductor L1;

[0059] An input end of the second filter inductor L2 is connected to an external power supply, and an output end of the second filter inductor L2 is connected to a second asymmetric half-bridge circuit;

[0060] An input end of the fourth switch S4 is connected to an external power supply, an output end of the fourth switch S4 is connected to an input end of the third filter inductor L3, an output end of the third filter inductor L3 is connected to the second asymmetric half-bridge circuit, an input end of the third switch S3 is connected to an input end of the second filter inductor L2, an output end of the third switch S3 is connected to an input end of the fourth switch S4, an input end of the fifth switch S5 is connected to an external power supply, an output end of the fifth switch S5 is connected to an input end of the charging resistor R1, and an output end of the charging resistor R1 is connected to an output end of the third filter inductor L3.

[0061] As shown in FIG1 , the circuit structures of the first asymmetric half-bridge circuit, the second asymmetric half-bridge circuit, and the third asymmetric half-bridge circuit of the present invention are all the same. The specific circuit structures of the three asymmetric half-bridge circuits are as follows:

[0062] The first asymmetric half-bridge circuit includes a first controllable switch device Q1, a second controllable switch device Q2, a first diode D1 and a second diode D2. One end of the first motor winding A is respectively connected to the output end of the first controllable switch device Q1 and the cathode of the first diode D1, and the other end of the first motor winding A is respectively connected to the input end of the second controllable switch device Q2 and the anode of the second diode D2. The input end of the first controllable switch device Q1 and the cathode of the second diode D2 are both connected to the positive electrode of the battery, the output end of the second controllable switch device Q2 and the anode of the first diode D1 are both connected to the negative electrode of the battery, and the output end of the first filter inductor L1 is connected to the input end of the second controllable switch device Q2.

[0063] The second asymmetric half-bridge circuit includes a third controllable switch device Q3, a fourth controllable switch device Q4, a third diode D3 and a fourth diode D4. One end of the second motor winding B is respectively connected to the output end of the third controllable switch device Q3 and the cathode of the third diode D3. The other end of the second motor winding B is respectively connected to the input end of the fourth controllable switch device Q4 and the anode of the fourth diode D4. The input end of the third controllable switch device Q3 and the cathode of the fourth diode D4 are both connected to the positive electrode of the battery. The output end of the fourth controllable switch device Q4 and the anode of the third diode D3 are both connected to the negative electrode of the battery. The output end of the second filter inductor L2 is connected to the input end of the fourth controllable switch device Q4.

[0064] The third asymmetric half-bridge circuit includes a fifth controllable switch device Q5, a sixth controllable switch device Q6, a fifth diode D5 and a sixth diode D6. One end of the third motor winding C is respectively connected to the output end of the fifth controllable switch device Q5 and the cathode of the fifth diode D5, and the other end of the third motor winding C is respectively connected to the input end of the sixth controllable switch device Q6 and the anode of the sixth diode D6. The input end of the fifth controllable switch device Q5 and the cathode of the sixth diode D6 are both connected to the positive electrode of the battery, the output end of the sixth controllable switch device Q6 and the anode of the fifth diode D5 are both connected to the negative electrode of the battery, and the output end of the third filter inductor L3 is connected to the input end of the sixth controllable switch device Q6.

[0065] Example 2

[0066] The present invention provides a control method for a high-power motor driving and charging integrated system, which includes:

[0067] Step S1: When the system is in driving mode, the control methods of the first motor winding A, the second motor winding B, and the third motor winding C are all the same. The equivalent circuit of the system is shown in Figure 3. The control steps of the first motor winding A are as follows:

[0068] Step S11: The first controllable switch device Q1 and the second controllable switch device Q2 of the first asymmetric half-bridge circuit are both turned on, and the battery excites the first motor winding AA;

[0069] Step S12: The first controllable switch device Q1 and the second controllable switch device Q2 of the first asymmetric half-bridge circuit are both turned off, and the current on the first motor winding A is fed back to the battery through the first diode D1 and the second diode D2.

[0070] Step S2: When the system is in charging mode, the motor stops working, and the switching component selects the corresponding filter circuit from the first filter inductor L1, the second filter inductor L2 and the third filter inductor L3 according to different charging modes to access the circuit, and then reuses the first asymmetric half-bridge circuit, the second asymmetric half-bridge circuit and the third asymmetric half-bridge circuit to charge the battery.

[0071] The control methods under the three charging modes are as follows:

[0072] 1. When the charging mode is three-phase charging, the motor stops working, the external power supply is a three-phase AC power supply, and a three-phase three-wire system is adopted. The equivalent circuit of the system is shown in Figure 4;

[0073] During the pre-charging period, the second switch S2, the fourth switch S4, and the fifth switch S5 of the switching assembly are closed, and the first filter inductor L1, the second filter inductor L2, the third filter inductor L3, and the charging resistor R1 are connected to the circuit. The charging resistor R1 is connected in parallel to both ends of the third filter inductor L3. The first live wire of the external power supply is connected to the first asymmetric half-bridge circuit through the first filter inductor L1, the second live wire of the external power supply is connected to the second asymmetric half-bridge circuit through the second filter inductor L2, and the third live wire of the external power supply is connected to the third asymmetric half-bridge circuit through the third filter inductor L3.

[0074] After pre-charging is completed, the fifth switch S5 of the switching component is disconnected, and the charging resistor R1 is removed from the circuit. The first controllable switch device Q1, the second controllable switch device Q2 of the first asymmetric half-bridge circuit, the third controllable switch device Q3, the fourth controllable switch device Q4 of the second asymmetric half-bridge circuit, and the fifth controllable switch device Q5, the sixth controllable switch device Q6 of the third asymmetric half-bridge circuit form a controllable rectifier bridge for rectification, and the battery is charged with constant voltage or constant current. Using a three-phase controlled rectifier bridge, the present invention reuses the controllable switch devices of the asymmetric half bridge, reducing costs. At the same time, compared with full-bridge rectification, the asymmetric half bridge has no shoot-through risk, does not require the insertion of a conduction dead zone, and has a low harmonic content in the input current.

[0075] 2. When the charging mode is single-phase charging, the motor stops working and the external power supply is a single-phase AC power supply. The equivalent circuit of the system is shown in Figure 5.

[0076] During the pre-charging period, the first switch S1, the third switch S3, the fourth switch S4, and the fifth switch S5 of the switching assembly are closed, the second filter inductor L2, the third filter inductor L3, and the charging resistor R1 are connected to the circuit, the charging resistor R1 is connected in parallel across the third filter inductor L3, the neutral line of the external power supply is connected to the first asymmetric half-bridge circuit, the live line of the external power supply is connected to the input ends of the second filter inductor L2 and the third filter inductor L3, respectively, the output end of the second filter inductor L2 is connected to the second asymmetric half-bridge circuit, and the output end of the third filter inductor L3 is connected to the third asymmetric half-bridge circuit;

[0077] After pre-charging is completed, the fifth switch S5 of the switching component is disconnected, and the charging resistor R1 is removed from the circuit. The second controllable switch device Q2 and the second diode D2 of the first asymmetric half-bridge circuit, the fourth controllable switch device Q4 and the fourth diode D4 of the second asymmetric half-bridge circuit, and the sixth controllable switch device Q6 and the sixth diode D6 of the third asymmetric half-bridge circuit form an interleaved parallel totem pole bridgeless PFC to perform power factor correction and rectification to charge the battery.

[0078] During the positive half-cycle of the AC voltage, the fourth and sixth controllable switches Q4 and Q6 conduct in alternating half-cycles, allowing the second and third filter inductors L2 and L3 to store energy. When off, the battery and voltage-stabilizing capacitor C1 are charged via the fourth and sixth diodes D4 and D6, respectively. During the negative half-cycle of the AC voltage, the third and fifth controllable switches Q3 and Q5 conduct in alternating half-cycles, allowing the second and third filter inductors L2 and L3 to store energy. When off, the battery and voltage-stabilizing capacitor C1 are charged via the fourth and sixth diodes D4 and D6, respectively. By reusing asymmetric half-bridge power devices to achieve interleaved parallel totem pole bridgeless PFC, no additional rectifier bridge is required, reducing size and cost, lowering losses, and improving power density and efficiency. Furthermore, the interleaved parallel approach can reduce input and output current ripple and reduce the size of the filter inductors.

[0079] 3. When the charging mode is DC charging, the motor stops working and the external power supply is a DC power supply. The equivalent circuit of the system is shown in Figure 6;

[0080] During the pre-charging period, the first switch S1, the third switch S3, the fourth switch S4, and the fifth switch S5 of the switching assembly are closed, the second filter inductor L2, the third filter inductor L3, and the charging resistor R1 are connected to the circuit, the charging resistor R1 is connected in parallel to both ends of the third filter inductor L3, the negative electrode of the external power supply is connected to the first asymmetric half-bridge circuit, the positive electrode of the external power supply is connected to the input ends of the second filter inductor L2 and the third filter inductor L3, respectively, the output end of the second filter inductor L2 is connected to the second asymmetric half-bridge circuit, and the output end of the third filter inductor L3 is connected to the third asymmetric half-bridge circuit;

[0081] After pre-charging is completed, the fifth switch S5 of the switching component is disconnected, and the charging resistor R1 is removed from the circuit. The second controllable switch device Q2 of the first asymmetric half-bridge circuit, the fourth controllable switch device Q4 of the second asymmetric half-bridge circuit, and the sixth controllable switch device Q6 of the third asymmetric half-bridge circuit form an interleaved parallel Boost DC / DC circuit to charge the battery.

[0082] The fourth and sixth controllable switches Q4 and Q6 conduct in alternating half-cycles, storing energy in the second and third filter inductors L2 and L3. When off, they charge the battery and stabilizing capacitor C1 through the fourth and sixth diodes D4 and D6, respectively. Current flows back to the cathode via the body diode of the second controllable switch Q2. Because DC charging typically generates high power, reusing the external inductor used for AC charging eliminates the need for motor windings, reducing additional motor losses. The staggered parallel configuration further optimizes charging performance.

[0083] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A high-power drive and charging integrated system for an electric motor, characterized in that: It includes a storage battery, a voltage stabilizing capacitor (C1), a charging resistor (R1), a switching component, a first filter inductor (L1), a second filter inductor (L2), a third filter inductor (L3), a first asymmetrical half-bridge circuit, a second asymmetrical half-bridge circuit, a third asymmetrical half-bridge circuit, a first motor winding (A), a second motor winding (B), and a third motor winding (C); The voltage stabilizing capacitor (C1) is connected in parallel across the positive and negative terminals of the storage battery, and the first asymmetrical half-bridge circuit, the second asymmetrical half-bridge circuit, and the third asymmetrical half-bridge circuit are all connected to the positive and negative terminals of the storage battery; When the system is in the driving mode, the external power supply is not connected to the circuit, and the storage battery supplies power. The first filter inductor (L1), the second filter inductor (L2), and the third filter inductor (L3) do not work, and the electrical energy of the storage battery is converted into mechanical energy through the first motor winding (A), the second motor winding (B), and the third motor winding (C); When the system is in the charging mode, the charging mode includes a three-phase charging mode, a single-phase charging mode, and a DC charging mode; the switching component selects the corresponding filter circuit from the first filter inductor (L1), the second filter inductor (L2), and the third filter inductor (L3) to be connected to the circuit according to different charging modes, and then multiplexes the first asymmetrical half-bridge circuit, the second asymmetrical half-bridge circuit, and the third asymmetrical half-bridge circuit to charge the storage battery.

2. The integrated system for high-power driving and charging of an electric motor according to claim 1, characterized in that: The input end of the first filter inductor (L1) is connected with a first terminal (P1), the input end of the second filter inductor (L2) is connected with a second terminal (P2), and the input end of the third filter inductor (L3) is connected with a third terminal (P3); When the system is in the three-phase charging mode, the external power supply is a three-phase AC power supply. The first live wire of the three-phase AC power supply is connected to the first terminal (P1), the second live wire of the three-phase AC power supply is connected to the second terminal (P2), and the third live wire of the three-phase AC power supply is connected to the third terminal (P3); When the system is in the single-phase charging mode, the external power supply is a single-phase AC power supply. The neutral wire of the single-phase AC power supply is connected to the first terminal (P1), and the live wire of the single-phase AC power supply is connected to the second terminal (P2) or the third terminal (P3); When the system is in the DC charging mode, the external power supply is a DC power supply. The negative pole of the DC power supply is connected to the first terminal (P1), and the positive pole of the DC power supply is connected to the second terminal (P2) or the third terminal (P3).

3. The integrated system for high-power drive and charging of an electric motor according to claim 1, characterized in that: The switching component includes a first switching switch (S1), a second switching switch (S2), a third switching switch (S3), a fourth switching switch (S4), and a fifth switching switch (S5); The input end of the second switching switch (S2) is connected to the external power supply, the output end of the second switching switch (S2) is connected to the input end of the first filter inductor (L1), the output end of the first filter inductor (L1) is connected to the first asymmetrical half-bridge circuit, the input end of the first switching switch (S1) is connected to the input end of the second switching switch (S2), and the output end of the first switching switch (S1) is connected to the output end of the first filter inductor (L1); The input end of the second filter inductor (L2) is connected to an external power supply, and the output end of the second filter inductor (L2) is connected to a second asymmetrical half-bridge circuit; The input end of the fourth switching switch (S4) is connected to an external power supply, the output end of the fourth switching switch (S4) is connected to the input end of a third filter inductor (L3), the output end of the third filter inductor (L3) is connected to a second asymmetrical half-bridge circuit, the input end of the third switching switch (S3) is connected to the input end of the second filter inductor (L2), the output end of the third switching switch (S3) is connected to the input end of the fourth switching switch (S4), the input end of the fifth switching switch (S5) is connected to an external power supply, the output end of the fifth switching switch (S5) is connected to the input end of a charging resistor (R1), and the output end of the charging resistor (R1) is connected to the output end of the third filter inductor (L3).

4. The integrated system for high-power driving and charging of an electric motor according to claim 1, characterized in that: The first asymmetrical half-bridge circuit includes a first controllable switch device (Q1), a second controllable switch device (Q2), a first diode (D1), and a second diode (D2). One end of the first motor winding (A) is respectively connected to the output end of the first controllable switch device (Q1) and the cathode of the first diode (D1), and the other end of the first motor winding (A) is respectively connected to the input end of the second controllable switch device (Q2) and the anode of the second diode (D2). The input end of the first controllable switch device (Q1) and the cathode of the second diode (D2) are both connected to the positive electrode of the storage battery, and the output end of the second controllable switch device (Q2) and the anode of the first diode (D1) are both connected to the negative electrode of the storage battery. The output end of the first filter inductor (L1) is connected to the input end of the second controllable switch device (Q2).

5. The integrated system for high-power driving and charging of an electric motor according to claim 1, wherein: The second asymmetrical half-bridge circuit includes a third controllable switch device (Q3), a fourth controllable switch device (Q4), a third diode (D3), and a fourth diode (D4). One end of the second motor winding (B) is respectively connected to the output end of the third controllable switch device (Q3) and the cathode of the third diode (D3), and the other end of the second motor winding (B) is respectively connected to the input end of the fourth controllable switch device (Q4) and the anode of the fourth diode (D4). The input end of the third controllable switch device (Q3) and the cathode of the fourth diode (D4) are both connected to the positive electrode of the storage battery, and the output end of the fourth controllable switch device (Q4) and the anode of the third diode (D3) are both connected to the negative electrode of the storage battery. The output end of the second filter inductor (L2) is connected to the input end of the fourth controllable switch device (Q4).

6. The integrated motor high-power drive and charging system according to claim 1, characterized in that: The third asymmetrical half-bridge circuit includes a fifth controllable switching device (Q5), a sixth controllable switching device (Q6), a fifth diode (D5) and a sixth diode (D6). One end of the third motor winding (C) is respectively connected to the output end of the fifth controllable switching device (Q5) and the cathode of the fifth diode (D5). The other end of the third motor winding (C) is respectively connected to the input end of the sixth controllable switching device (Q6) and the anode of the sixth diode (D6). The input end of the fifth controllable switching device (Q5) and the cathode of the sixth diode (D6) are both connected to the positive electrode of the storage battery. The output end of the sixth controllable switching device (Q6) and the anode of the fifth diode (D5) are both connected to the negative electrode of the storage battery. The output end of the third filter inductor (L3) is connected to the input end of the sixth controllable switching device (Q6).

7. A control method for an integrated motor high-power drive and charging system according to any one of claims 1 to 6, comprising: Step S1: When the system is in the drive mode, the control methods of the first motor winding (A), the second motor winding (B) and the third motor winding (C) are the same. Among them, the control steps of the first motor winding (A) are as follows: Step S11: The first controllable switching device (Q1) and the second controllable switching device (Q2) of the first asymmetrical half-bridge circuit are both turned on, and the storage battery excites the first motor winding (A). Step S12: The first controllable switching device (Q1) and the second controllable switching device (Q2) of the first asymmetrical half-bridge circuit are both turned off, and the current on the first motor winding (A) continues to flow through the first diode (D1) and the second diode (D2) and is fed back to the storage battery. Step S2: When the system is in the charging mode, the motor stops working. The switching component selects the corresponding filter circuit from the first filter inductor (L1), the second filter inductor (L2) and the third filter inductor (L3) and connects it to the circuit according to different charging modes, and then multiplexes the first asymmetrical half-bridge circuit, the second asymmetrical half-bridge circuit and the third asymmetrical half-bridge circuit to charge the storage battery.

8. The control method according to claim 7, characterized in that, The step S2 includes: When the charging mode is three-phase charging, the motor stops working; During pre-charging, the second switching switch (S2), the fourth switching switch (S4) and the fifth switching switch (S5) of the switching component are closed, connecting the first filter inductor (L1), the second filter inductor (L2), the third filter inductor (L3) and the charging resistor (R1) to the circuit. The charging resistor (R1) is connected in parallel across the third filter inductor (L3). The first live wire of the external power supply is connected to the first asymmetrical half-bridge circuit through the first filter inductor (L1). The second live wire of the external power supply is connected to the second asymmetrical half-bridge circuit through the second filter inductor (L2). The third live wire of the external power supply is connected to the third asymmetrical half-bridge circuit through the third filter inductor (L3). After pre-charging is completed, the fifth switching switch (S5) of the switching component disconnects, removing the charging resistor (R1) from the circuit. The first controllable switch device (Q1) and the second controllable switch device (Q2) of the first asymmetrical half-bridge circuit, the third controllable switch device (Q3) and the fourth controllable switch device (Q4) of the second asymmetrical half-bridge circuit, and the fifth controllable switch device (Q5) and the sixth controllable switch device (Q6) of the third asymmetrical half-bridge circuit form a controllable rectifier bridge for rectification to charge the storage battery with constant voltage or constant current.

9. The control method according to claim 7, wherein The step S2 includes: When the charging mode is single-phase charging, the motor stops working; During pre-charging, the first switching switch (S1), the third switching switch (S3), the fourth switching switch (S4), and the fifth switching switch (S5) of the switching component close, connecting the second filter inductor (L2), the third filter inductor (L3), and the charging resistor (R1) to the circuit. The charging resistor (R1) is connected in parallel across both ends of the third filter inductor (L3). The neutral line of the external power supply is connected to the first asymmetrical half-bridge circuit, the live wire of the external power supply is respectively connected to the input ends of the second filter inductor (L2) and the third filter inductor (L3). The output end of the second filter inductor (L2) is connected to the second asymmetrical half-bridge circuit, and the output end of the third filter inductor (L3) is connected to the third asymmetrical half-bridge circuit; After pre-charging is completed, the fifth switching switch (S5) of the switching component disconnects, removing the charging resistor (R1) from the circuit. The second controllable switch device (Q2) and the second diode (D2) of the first asymmetrical half-bridge circuit, the fourth controllable switch device (Q4) and the fourth diode (D4) of the second asymmetrical half-bridge circuit, and the sixth controllable switch device (Q6) and the sixth diode (D6) of the third asymmetrical half-bridge circuit form an interleaved totem-pole bridgeless PFC for power factor correction and rectification to charge the storage battery.

10. The control method according to claim 7, characterized in that The step S2 includes: When the charging mode is DC charging, the motor stops working; During pre-charging, the first switching switch (S1), the third switching switch (S3), the fourth switching switch (S4), and the fifth switching switch (S5) of the switching component close, connecting the second filter inductor (L2), the third filter inductor (L3), and the charging resistor (R1) to the circuit. The charging resistor (R1) is connected in parallel across both ends of the third filter inductor (L3). The negative pole of the external power supply is connected to the first asymmetrical half-bridge circuit, the positive pole of the external power supply is respectively connected to the input ends of the second filter inductor (L2) and the third filter inductor (L3). The output end of the second filter inductor (L2) is connected to the second asymmetrical half-bridge circuit, and the output end of the third filter inductor (L3) is connected to the third asymmetrical half-bridge circuit; After the pre-charging is completed, the fifth switching switch (S5) of the switching component is disconnected to remove the charging resistor (R1) from the circuit. The second controllable switch device (Q2) of the first asymmetrical half-bridge circuit, the fourth controllable switch device (Q4) of the second asymmetrical half-bridge circuit, and the sixth controllable switch device (Q6) of the third asymmetrical half-bridge circuit form an interleaved parallel Boost DC / DC circuit to charge the storage battery.

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