Power conversion circuit and inverter

Abstract

To provide a power conversion circuit and an inverter.SOLUTION: An inverter, coupled to a battery, the motor, and the wireless charging transmitter respectively, and including three half-bridge circuits, each of the three half-bridge circuits including two switches; and a processor, coupled to switches of the three half-bridge circuits, configured to generate control signals in a first time period, and control the switches respectively according to first levels of the control signals, so as to supply power to the motor from the battery; The processor is configured to adjust the first level of each of the plurality of control signals to a second level in a second time period, turn off one of the three half-bridge circuits, and alternately turn on the plurality of switches of the other two half-bridge circuits, to adjust the power supply of the wireless charging transmitter, so as to charge the battery to a target power.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present application relates to electronic devices that can be charged and discharged, and more particularly to power conversion circuits and inverters. [Background technology]

[0002] Existing power conversion circuits require an external rectifier to convert the alternating current (AC) of the secondary coil into direct current (DC). The DC current then needs to be converted to a DC voltage value (or voltage level) specified by the battery via a DC-DC converter. Therefore, the external rectifier and DC-DC converter each occupy a certain amount of space within the device and affect the heat dissipation effect. These two circuits are disadvantageous for miniaturizing the device.

[0003] Therefore, there are still many deficiencies in the above technology, and it is necessary for those skilled in the art to develop other suitable power conversion circuits and inverters. Summary of the Invention

[0004] One aspect of the present application relates to a power conversion circuit coupled to a motor and a wireless charging transmitting end, the power conversion circuit comprising: an inverter coupled to a battery, the motor, and the wireless charging transmitting end, each including three half-bridge circuits, each including two switches; and a processor coupled to a plurality of switches of the three half-bridge circuits, wherein the processor generates control signals in a first period and controls the plurality of switches respectively based on a first level of each of the plurality of control signals, so as to power the battery to the motor; and the processor adjusts the first level of each of the plurality of control signals to a second level in a second period to turn off one of the three half-bridge circuits and alternately turn on the plurality of switches of the other two half-bridge circuits according to the plurality of control signals, thereby adjusting the power supply of the wireless charging transmitting end.

[0005] Another aspect of the present application relates to an inverter provided in a power conversion circuit coupled between a motor and a wireless charging transmitting end, the inverter including three half-bridge circuits each including two switches, each coupled to a battery, the motor, and the wireless charging transmitting end, the switches of the three half-bridge circuits respectively receiving control signals from a processor to power the battery to the motor, and controlling the switches based on a first level of each of the control signals in a first period, the processor adjusting the first level of each of the control signals to a second level in a second period to turn off one of the three half-bridge circuits and alternately turn on the switches of the other two half-bridge circuits according to the control signals, thereby adjusting the power supply of the wireless charging transmitting end.

[0006] In view of the drawbacks and deficiencies of the prior art, the present application provides a power conversion circuit and inverter design, which can achieve a compact design of the power conversion circuit. [Brief explanation of the drawings]

[0007] The contents of this application can be better understood with reference to the embodiments in the following paragraphs and the following drawings. [Figure 1] 1 is a circuit block diagram of an electronic device and a wireless charging transmitting end according to some embodiments of the present application; [Figure 2] FIG. 2 is a detailed circuit schematic diagram of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application. [Figure 3A] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 3B] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 4] FIG. 2 is a schematic diagram of voltage and current of a power conversion circuit according to some embodiments of the present application. [Figure 5A] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 5B] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 6A] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 6B] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 6C] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 6D] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 6E] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 6F] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 7] 1 is a circuit block diagram of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 8] FIG. 2 is a schematic diagram of a circuit state in a charging mode of a power conversion circuit according to some embodiments of the present application. [Figure 9] FIG. 2 is a schematic diagram of a circuit state in a charging mode of a power conversion circuit according to some embodiments of the present application. [Figure 10] FIG. 2 is a schematic diagram of a circuit state in a discharge mode of a power conversion circuit according to some embodiments of the present application. [Figure 11] 1 is a schematic diagram of the circuit state of a power conversion circuit, a motor, a battery, and a wireless charging transmitting end according to some embodiments of the present application; FIG. [Figure 12] FIG. 2 is a schematic diagram of a circuit state in a charging mode of a power conversion circuit according to some embodiments of the present application. [Figure 13] FIG. 2 is a schematic diagram of a circuit state in a charging mode of a power conversion circuit according to some embodiments of the present application. [Figure 14] FIG. 2 is a schematic diagram of a circuit state in a discharge mode of a power conversion circuit according to some embodiments of the present application. DETAILED DESCRIPTION OF THE INVENTION

[0008] Hereinafter, the spirit of the present application will be clearly explained by the drawings and detailed description, and after understanding the embodiments of the present application, those skilled in the art can make changes and modifications based on the technology taught in the present application without departing from the spirit and scope of the present application.

[0009] The coil of an existing power conversion circuit requires an external rectifier to rectify the alternating current (AC) induced in the secondary coil into direct current (DC). The DC current must then be converted to a DC voltage value (or voltage level) specified by the battery via a DC-DC converter. Furthermore, both the externally connected rectifier and DC-DC converter are only used in a charging mode for wirelessly charging the battery. In other words, when the battery is in a discharging mode for discharging to a motor, the externally connected rectifier and DC-DC converter are essentially useless.

[0010] Therefore, the externally connected rectifier and DC-DC converter each occupy a certain proportion of the device's space and affect the heat dissipation effect. This application designs an operation method and circuit structure for an inverter that shares a power conversion circuit, thereby achieving weight reduction, saving on the internal space and component costs of the device, and further realizing a more compact design of the device.

[0011] To facilitate understanding of the simple structure and operation of the circuit designed herein, please refer to FIG. 1. FIG. 1 is a circuit block diagram of an electronic device 10 and a wireless charging transmitting end 900 according to some embodiments of the present application. In some embodiments, the electronic device 10 may be implemented as a mobile electronic device, such as an electric bicycle (E-bike) or an unmanned vehicle in a factory. The electronic device 10 includes a motor M and a battery B. According to current needs, the electronic device 10 needs to convert the power of the battery B to drive the motor M, and the electronic device 10 needs to rectify the power of a charging power source to charge the battery B. The electronic device 10 further includes a power conversion circuit 100. The battery B may be located within the power conversion circuit 100 or outside the power conversion circuit 100 according to actual needs.

[0012] The power conversion circuit 100 is coupled between the wireless charging transmitting end 900 and the battery B. The wireless charging transmitting end 900 is connected to a DC power source (not shown). The wireless charging transmitting end 900 includes a half-bridge circuit (not shown). The wireless charging transmitting end 900 outputs a square wave through the half-bridge circuit, and converts the DC power of the DC power source into AC power through the inductors and capacitors of the wireless charging transmitting end 900. At this time, the AC power generates a magnetic field through the transmitting end of the wireless charging coil CC, and transfers energy to the receiving end of the wireless charging coil CC for energy conversion and further charging the battery B. In the charging mode (also called the charging period) of the circuit designed in this application, the charging path starts from the wireless charging transmitting end 900, passes through the wireless charging coil CC and the power conversion circuit 100 in sequence, and reaches the battery B.

[0013] The power conversion circuit 100 is coupled between a battery B and a motor M. In the discharge mode (also called the discharge period) of the circuit designed in this application, the discharge path starts from the battery B, passes through the power conversion circuit 100 sequentially, and reaches the motor M. Therefore, the power conversion circuit 100 of this application is in an operational state in both the charge mode (also called the charge period) and the discharge mode. In this disclosure, an implementation method for solving the above problem will be described in the following paragraphs.

[0014] For a clearer understanding of the detailed structure of the power conversion circuit 100 of the present application, please refer to FIG. 2. FIG. 2 is a detailed circuit diagram of the power conversion circuit 100, a motor M, a battery B, and a wireless charging transmitting end 900 according to some embodiments of the present application. In some embodiments, referring to FIG. 2, the power conversion circuit 100 includes an inverter 110, a processor 120, a converter 130, a protection switch SW1, and a protection switch SW2. The inverter 110 is coupled to the motor M, a capacitor C1, and the converter 130. The inverter 110 is coupled to the battery B and the capacitor C2 via the converter 130. The processor 120 is coupled to the converter 130, the protection switch SW1, and the protection switch SW2.

[0015] In some embodiments, the inverter 110 includes transistors Q1 to Q6, with the top and right sides of the elements in the drawing used as first terminals. Each of transistors Q1 to Q6 includes a first terminal, a second terminal, and a control terminal. The first terminals of transistors Q1, Q3, and Q5 are coupled to a first terminal of capacitor C1. The second terminals of transistors Q2, Q4, and Q6 are coupled to a second terminal of capacitor C1. The second terminal of transistor Q1 is coupled to a first terminal of transistor Q2 and node N1. Transistors Q1 and Q2 belong to the same half-bridge circuit. The second terminal of transistor Q3 is coupled to a first terminal of transistor Q4 and node N2. Transistors Q3 and Q4 belong to the same half-bridge circuit. The second terminal of transistor Q5 is coupled to a first terminal of transistor Q6 and node N3. Transistors Q5 and Q6 belong to the same half-bridge circuit. It should be noted that transistors Q1 to Q6 are used to amplify signals within the circuit. Transistors Q1 to Q6 are used as switches in this application.

[0016] In some embodiments, transistors Q1 through Q6 may be implemented as P-type metal-oxide-semiconductor field-effect transistors (PMOS) or N-type metal-oxide-semiconductor field-effect transistors (NMOS) depending on actual needs. In some embodiments, transistors Q1 through Q6 include corresponding parasitic diodes P1 through P6, respectively.

[0017] In some embodiments, referring to FIG. 2 , processor 120 is coupled to transistors Q1 through Q6 of inverter 110, respectively. Processor 120 is used to generate control signals S1 through S6 to corresponding transistors Q1 through Q6, respectively. In some embodiments, processor 120 may be implemented using simple hardware and does not rely on software to implement its functions. For example, processor 120 may monitor the voltage and current of the circuits in power conversion circuit 100 via a voltage / current detection circuit in converter 130 to generate control signals S1 through S6, respectively. In some embodiments in which processor 120 is implemented using simple hardware, processor 120 may be implemented using an application specific integrated circuit (ASIC).

[0018] In some embodiments, converter 130 may be implemented as a circuit or electromechanical device for electrical energy conversion (DC-to-DC converter), which can further convert the original DC power source into a DC power source of a different voltage value.

[0019] In some embodiments, the motor M may be implemented as a three-phase motor. A three-phase motor includes three stator windings (e.g., motor inductor L1, motor inductor L2, and motor inductor L3). The voltages / currents of each phase are spaced 120 degrees apart, forming a rotating magnetic field that drives the rotor to rotate (e.g., phase Vu, phase Vv, and phase Vw).

[0020] In some embodiments, the protection switch SW1 and the protection switch SW2 are coupled to node N2 (i.e., a half-bridge circuit formed by transistor Q3 and transistor Q4). In charge mode (also called charging period), the protection switch SW1 is turned on and the protection switch SW2 is not turned on to ensure that the charging path in charge mode does not affect the motor M. In discharge mode (also called discharging period), the protection switch SW1 is not turned on and the protection switch SW2 is turned on to ensure that the discharging path in discharge mode does not affect the wireless charging coil CC and the wireless charging transmitting end 900. In some embodiments, the protection switch SW1 and the protection switch SW2 are respectively turned on and off based on an operation signal output by the processor 120.

[0021] It should be noted that the protection switch SW1 and the protection switch SW2 are not necessarily coupled to the same node, and the locations of the protection switch SW1 and the protection switch SW2 can be designed according to actual needs and are not limited to the embodiments shown in the drawings of this application.

[0022] 2, the inverter 110 is used to rectify the AC power induced by the wireless charging coil CC in charging mode and convert it into DC power. Then, the converter 130 converts the DC power into DC power of a different voltage value in charging mode and stores it in the battery B. The rectification method of the inverter 110 of the present application may be implemented as active rectification or passive rectification depending on the characteristics of the components. The detailed rectification operation will be described in the following paragraphs.

[0023] For a clearer understanding of the detailed rectification operation of the power conversion circuit 100 of the present application, please also refer to FIGS. 3A to 4. FIGS. 3A to 3B are schematic diagrams of the circuit states of the power conversion circuit 100, motor M, battery B, and wireless charging transmitting end 900 according to some embodiments of the present application. FIG. 4 is a schematic diagram of the voltage and current of the power conversion circuit 100 according to some embodiments of the present application. The voltage and current schematic diagram in FIG. 4 shows the voltage and current situations of the power conversion circuit 100 in charging mode. The voltage, current, and subscripts correspond to the respective elements in the power conversion circuit 100. It should be noted that in FIGS. 3A and 3B, the converter 130 is temporarily omitted, as the rectification operation of the inverter 110 will be mainly described in the following paragraphs.

[0024] 3A, 3B, and 4, when the power conversion circuit 100 is in the charging mode, the processor 120 of the power conversion circuit 100 outputs control signals S1 to S6 to turn off one of the three half-bridge circuits of the inverter 110 (e.g., the half-bridge circuit formed by transistors Q5 and Q6) and alternately turn on the other two half-bridge circuits of the inverter 110 (e.g., the two half-bridge circuits formed by transistors Q1 to Q4). The operation of the two half-bridge circuits formed by transistors Q1 to Q4 is similar to that of a full-bridge circuit. Specifically, as shown in FIG. 3A, first, transistors Q2 and Q3 are turned on, and transistors Q1 and Q4 are turned off. Next, as shown in FIG. 3B, transistors Q1 and Q4 are turned on, and transistors Q2 and Q3 are turned off. In this way, the alternate operation of transistors Q1 to Q4 can convert the negative voltage of an AC current into a positive voltage and rectify it into a DC voltage. The alternating operation of transistors Q1 to Q4 is active rectification in the charging mode (also called the charging period) of power conversion circuit 100.

[0025] Referring again to FIG. 2, the processor 120 of the power conversion circuit 100 determines the constant current (CC) or constant voltage (CV) charging mode by detecting the voltage / current of the converter 130.

[0026] When the voltage of battery B is lower than the preset voltage value of the constant voltage (CV) charging mode, processor 120 executes the constant current (CC) charging mode, sequentially controlling inverter 110 for rectification and converter 130 for conversion. At this time, battery B's voltage rises, its resistance decreases, and it is charged with a large current. When the voltage of battery B subsequently reaches the preset voltage value of the constant voltage (CV) charging mode, processor 120 executes the constant voltage (CV) charging mode again and charges battery B at the preset charging voltage value. At this time, battery B's terminal voltage reaches the preset charging voltage, but due to the influence of internal resistance, the effective voltage inside battery B is lower than the preset value. At the same time, the charging current decreases as the internal voltage of battery B rises. Finally, when the charging current reaches the preset final charging current value, battery B continues charging for a certain period of time and then the charging is completed.

[0027] If the voltage of battery B is higher than the preset voltage value for the constant voltage (CV) charging mode, the constant voltage (CV) charging mode will be directly implemented. The detailed operation has been described above and will not be repeated here.

[0028] 5A and 5B are schematic diagrams of the circuit states of the power conversion circuit 100, the motor M, the battery B, and the wireless charging transmitting end 900 according to some embodiments of the present application. In some embodiments, referring to FIGS. 5A and 5B, the charging mode of the power conversion circuit 100 may be implemented as passive rectification. The processor 120 of the power conversion circuit 100 outputs control signals S1 to S6 to turn off one of the three half-bridge circuits (e.g., the half-bridge circuit formed by transistors Q5 and Q6) and control the other two half-bridge circuits (e.g., the two half-bridge circuits formed by transistors Q1 to Q4) to operate in a nearly off state (i.e., a partially on state), thereby converting the negative voltage of the AC current into a positive voltage through the parasitic diodes P1 to P4 of the transistors Q1 to Q4 and rectifying it into a DC voltage. The method using the parasitic diodes P1 to P4 is passive rectification in the charging mode (also called the charging period) of the power conversion circuit 100.

[0029] 6A to 6F are schematic diagrams of the circuit states of the power conversion circuit 100, the motor M, the battery B, and the wireless charging transmitting end 900 according to some embodiments of the present application. The embodiments of FIGS. 6A to 6F show that different numbers and positions of switches are provided between the power conversion circuit 100, the wireless charging transmitting end 900, and the motor M.

[0030] 6A, the protection switch SW1 and the protection switch SW2 are coupled to a node N1 and are coupled to a first power supply (e.g., a lower phase power supply Vw) of the three-phase power supply of the motor M. The switch SW3 is coupled to a node N2 and are coupled to a second power supply (e.g., a middle phase power supply Vv) of the three-phase power supply of the motor M. The switch SW4 is coupled to a node N3 and are coupled to a third power supply (e.g., an upper phase power supply Vu) of the three-phase power supply of the motor M.

[0031] 6B, the protection switch SW1 and the protection switch SW2 are coupled to a node N1 and are coupled to a first power supply (e.g., a lower phase power supply Vw) of the three-phase power supply of the motor M. The switch SW3 is coupled to a node N2 and are coupled to a second power supply (e.g., a middle phase power supply Vv) of the three-phase power supply of the motor M.

[0032] Referring to FIG. 6C, the protection switch SW1 and the protection switch SW2 are coupled to the node N2 and to a first power supply of the three-phase power supply of the motor M (for example, the middle phase power supply Vv).

[0033] 6D, the protection switch SW1 is coupled to the node N2 and is coupled to a first power supply (e.g., a middle phase power supply Vv) of the three-phase power supply of the motor M. The protection switch SW2 is coupled to the node N1 and is coupled to a second power supply (e.g., a lower phase power supply Vw) of the three-phase power supply of the motor M.

[0034] Referring to FIG. 6E, the protection switch SW1 and the protection switch SW2 are coupled to the node N2 and to a first power supply of the three-phase power supply of the motor M (eg, the lower phase power supply Vw).

[0035] 6F, the protection switch SW1 is coupled to a node N1 and is coupled to a first power supply (e.g., a lower phase power supply Vw) of the three-phase power supply of the motor M. The protection switch SW2 is coupled to a node N2 and is coupled to a second power supply (e.g., a middle phase power supply Vv) of the three-phase power supply of the motor M.

[0036] The main purpose of the design of the different numbers and positions of switches is to ensure that the charging path of the power conversion circuit 100 in charging mode does not affect the motor M, and that the discharging path of the power conversion circuit 100 in discharging mode does not affect the wireless charging transmitting end 900. This design can also ensure that residual charges or leakage currents in the circuit structure do not affect the elements of the power conversion circuit 100, or can check whether the multiple switches and elements in the power conversion circuit 100 are normal upon detection.

[0037] Therefore, the shared inverter design of the power conversion circuit 100 solves the problem that the externally connected rectifier occupies a certain proportion of the space of the device, and realizes a compact design of the device. However, the present application further proposes an additional shared design to further reduce the volume of the present power conversion circuit 100. The detailed compact design will be described in the following paragraphs.

[0038] To facilitate understanding of the circuit structure and operation of the miniaturized design of the present application, the present application first introduces the operation of the converter 130. Please refer to FIG. 7. FIG. 7 is a circuit block diagram of a power conversion circuit 100, a motor M, a battery B, and a wireless charging transmitter 900 according to some embodiments of the present application. In some embodiments, the power conversion circuit 100 includes an inverter 110, a processor 120, and a converter 130A. The converter 130A may be implemented as a buck converter. The converter 130A includes a converter switch Q7, a converter switch Q8, an inductor L4, and a capacitor C3. The converter switch Q7 and the converter switch Q8 each include a first end, a second end, and a control end. The first end of the converter switch Q7 is coupled to the inverter 110. The second end of the converter switch Q7 is coupled to the second end of the converter inductor L4. The control end of the converter switch Q7 is used to receive a first control signal S7. A first end of the converter inductor L4 is coupled to a first end of the capacitor C3. A first end of the converter switch Q8 is coupled to a second end of the converter switch Q7. A second end of the converter switch Q8 is coupled to the inverter 110 and the second end of the capacitor C3. A control end of the converter switch Q8 is used to receive a second control signal S8. The detailed circuit structures of the power conversion circuit 100 and the motor M in FIG. 7 are similar to those in FIG. 2 and will not be described again here. In some embodiments, the converter switch Q7 and the converter switch Q8 may be implemented as a P-type metal-oxide-semiconductor field-effect transistor (PMOS) or an N-type metal-oxide-semiconductor field-effect transistor (NMOS), respectively, according to actual needs.

[0039] FIG. 8 is a schematic diagram of a circuit state of a power conversion circuit 100 in a charging mode according to some embodiments of the present application. FIG. 9 is a schematic diagram of a circuit state of a power conversion circuit 100 in a charging mode according to some embodiments of the present application. The operation of transistors Q2 and Q3 of the inverter 110 of the power conversion circuit 100 of FIG. 8 is basically similar to the operation of transistors Q2 and Q3 of the inverter 110 of the power conversion circuit 100 of FIGS. 3A and 5A, and will not be repeated here. The operation of transistors Q1 and Q4 of the inverter 110 of the power conversion circuit 100 of FIG. 9 is basically similar to the operation of transistors Q1 and Q4 of the inverter 110 of the power conversion circuit 100 of FIGS. 3B and 5B, and will not be repeated here. For brevity, only the differences will be described below.

[0040] 8 and 9 show the operating states of the converter switch Q7 and the converter switch Q8 of the converter 130A. Referring to FIGS. 8 and 9, in a charging mode (also called a charging period), the transistors Q1 to Q4 of the inverter 110 are alternately turned on. At the same time, the converter switch Q7 and the converter switch Q8 of the converter 130A are both turned on, thereby converting the DC power rectified by the inverter 110 into power stored in the battery B.

[0041] FIG. 10 is a schematic diagram of a circuit state in a discharge mode of a power conversion circuit 100 according to some embodiments of the present application. Referring to FIG. 10, in the discharge mode (also referred to as a discharge period), the transistors Q1 to Q6 of the inverter 110 are alternately turned on. At the same time, the converter switch Q7 of the converter 130A is turned on and the converter switch Q8 is turned off to convert the DC power stored in the battery B into three-phase AC power for the motor M, thereby performing a process of discharging from the battery B to the motor M. It should be noted that, as shown in FIG. 10, the discharge path sequentially passes through the converter switch Q7 of the converter 130A, one bridge arm (e.g., transistor Q1) in the three half-bridge circuits of the inverter 110, and one of the three-phase power supplies (e.g., phase power supply Vw) of the motor M.

[0042] After understanding the operation of the converter 130A, please refer to FIG. 11 to facilitate understanding the circuit structure and operation of the miniaturized design of the present application. FIG. 11 is a schematic diagram of the circuit state of the power conversion circuit 100, the motor M, the battery B, and the wireless charging transmitting end 900 according to some embodiments of the present application. In some embodiments, the power conversion circuit 100 includes an inverter 110, a processor 120, and a converter 130B. The converter 130B may be implemented as a buck converter. The converter 130B includes a switching switch SW5, an inductor L5, a capacitor C4, a diode D1, and transistors Q5 and Q6 of the inverter 110. The switching switch SW5, the inductor L5, the capacitor C4, and the diode D1 of the converter all include first and second ends. The first end of the switching switch SW5 is coupled to node N3, the inverter 110, and one of the three-phase power supplies of the motor M. A second end of the changeover switch SW5 is coupled to a first end of the inductor L5 of the converter. A second end of the inductor L5 of the converter is coupled to a first end of the capacitor C4 and a second end (i.e., anode end) of the diode D1. The detailed circuit structures of the power conversion circuit 100 and the motor M in Figure 11 are similar to the detailed circuit structures in Figures 2 and 7, and will not be described again here.

[0043] FIG. 12 is a schematic diagram of a circuit state of a power conversion circuit 100 in a charging mode according to some embodiments of the present application. FIG. 13 is a schematic diagram of a circuit state of a power conversion circuit 100 in a charging mode according to some embodiments of the present application. The operation of transistors Q2 and Q3 of the inverter 110 of the power conversion circuit 100 of FIG. 12 is basically similar to the operation of transistors Q2 and Q3 of the inverter 110 of the power conversion circuit 100 of FIG. 3A and FIG. 5A, and will not be repeated here. The operation of transistors Q1 and Q4 of the inverter 110 of the power conversion circuit 100 of FIG. 13 is basically similar to the operation of transistors Q1 and Q4 of the inverter 110 of the power conversion circuit 100 of FIG. 3B and FIG. 5B, and will not be repeated here. For brevity, only the differences will be described below.

[0044] 12 and 13 show the operating states of transistors Q1 to Q6 of converter 130B and inverter 110. Referring to FIGS. 12 and 13, in a charging mode (also called a charging period), transistors Q1 to Q4 of inverter 110 are alternately turned on to perform rectification. At the same time, transistors Q5 and Q6 of inverter 110 are both turned on, and the DC power rectified by inverter 110 is converted into power stored in battery B in cooperation with inductor L5 and capacitor C4 of converter 130B.

[0045] The compact design of the present application utilizes one of the three half-bridge circuits that are inactive (or turned off) in the charging mode of the inverter 110 as part of the step-down converter. Compared with the embodiments of FIGS. 8 and 9, in the embodiments of FIGS. 12 and 13, one of the remaining three half-bridge circuits of the inverter 110 (i.e., the one that was inactive during rectification) is operated for conversion after rectification in the charging mode. In this way, the other two original half-bridge circuits remain alternately turned on for rectification. The design of the present application further reduces the number of elements in the power conversion circuit 100, thereby achieving compactness of the device.

[0046] FIG. 14 is a schematic diagram of a circuit state in a discharge mode of the power conversion circuit 100 according to some embodiments of the present application. Referring to FIG. 14, in the discharge mode (also referred to as a discharge period), the transistors Q1 to Q6 of the inverter 110 are alternately turned on. At the same time, the selector switch SW5 of the converter 130B is turned off to convert the DC power stored in the battery B into three-phase AC power for the motor M, thereby performing a process of discharging from the battery B to the motor M. It should be noted that, as shown in FIG. 14, the discharge path sequentially passes through the diode D1 of the converter 130B, one bridge arm (e.g., transistor Q1) in the three half-bridge circuits of the inverter 110, and one of the three-phase power supplies (e.g., a phase power supply) of the motor M.

[0047] According to the above embodiments, the present application provides a design of a power conversion circuit and an inverter, which solves the problem that an externally connected rectifier occupies a certain proportion of the space of the power conversion circuit, thereby realizing a compact design of the power conversion circuit, and further adjusts the operation of the inverter and converter of the power conversion circuit to further reduce the size of the power conversion circuit.

[0048] Although the present application has been disclosed above in detailed examples, the present application does not exclude other possible embodiments, and the scope of protection of the present application is based on that defined by the scope of the attached patent application, and is not limited by the above examples.

[0049] Those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Based on the above embodiments, all changes and modifications made to the present application also fall within the scope of protection of the present application. [Explanation of symbols]

[0050] 10:Electronic equipment 100: Power conversion circuit 900: Wireless charging transmitter B:Battery CC: Wireless charging coil M: Motor SW1~SW5: Switches 110: Inverter 120: Processor 130, 130A, 130B: Converter C1 to C4: Capacitors Q1 to Q6: Transistors Q7~Q8: Converter switches P1 to P6: Parasitic diodes S1 to S8: Control signals Vu, Vv, Vw: Phase power supply L1 to L5: inductors N1~N3: Nodes VG Q1 ~VG Q4 , V SW1 ~V SW2 :Voltage I Q1 ~I Q4 :Current V B : Battery voltage D1: Diode

Claims

1. A power conversion circuit coupled between the motor and the wireless charging transmitting end, an inverter including three half-bridge circuits, each including two switches, respectively coupled to a battery, the motor, and the wireless charging transmitting end; a processor coupled to the switches of the three half-bridge circuits; the processor generates a plurality of control signals during a first time period to cause the battery to power the motor; The processor turns off one of the three half-bridge circuits during a second period, and alternately turns on and off the switches of the other two half-bridge circuits according to the plurality of control signals, thereby rectifying the power supplied from the wireless charging transmitting end and charging the battery, so as to charge the battery to a target capacity. Power conversion circuits.

2. a first protection switch coupled between the inverter and the wireless charging transmitting end and coupled to one of the three half-bridge circuits; a second protection switch coupled to the inverter and the motor and to one of the three half-bridge circuits; further comprising the first protection switch is turned on during the second period based on a first operation signal, and the second protection switch is turned off during the second period based on a second operation signal; The power conversion circuit of claim 1 .

3. a converter coupled between the inverter and the battery, for converting the supply voltage rectified by the inverter and detecting the voltage and current of the battery; The power conversion circuit of claim 1 , wherein the processor determines a plurality of charging modes according to the voltage and the current of the battery detected by the converter.

4. The converter comprises: a converter inductor; a capacitor coupled to the converter inductor and the battery; a first converter switch coupled to the converter inductor and the inverter, and turned on during the first period based on a first control signal; a second converter switch coupled to the converter inductor, the capacitor, the inverter, and the battery, and turned off during the first period based on a second control signal; The power conversion circuit of claim 3 , comprising:

5. The power conversion circuit of claim 4 , wherein the processor turns on the first converter switch and the inverter during the first period so that the battery powers the motor.

6. The converter comprises: a converter inductor; a capacitor coupled to the transformer inductor; a diode coupled to the converter inductor, the capacitor, the inverter, and the battery; a changeover switch coupled to the converter inductor and turned on based on the control signal during the first period; The power conversion circuit of claim 3 , comprising:

7. 7. The power conversion circuit of claim 6, wherein the processor controls the three half-bridge circuits of the inverter during the first period so that the battery powers the motor through the diodes of the converter.

8. 7. The power conversion circuit according to claim 6, wherein the processor rectifies the supply power by controlling on / off of two of the three half-bridge circuits during the second period so that the supply power charges the battery to the target capacity, and converts the rectified supply power by controlling on / off of the changeover switch of the converter and the other one of the three half-bridge circuits.

9. An inverter provided in a power conversion circuit coupled between the motor and the wireless charging transmitting end, Three half-bridge circuits are coupled to a battery, the motor, and the wireless charging transmitting end, each half-bridge circuit including two switches; the switches of the three half-bridge circuits respectively receive a plurality of control signals from a processor to cause the battery to power the motor during a first period; The processor turns off one of the three half-bridge circuits during a second period, and alternately turns on and off the switches of the other two half-bridge circuits according to the plurality of control signals, thereby rectifying the power supplied from the wireless charging transmitting end and charging the battery, so as to charge the battery to a target capacity. Inverter.

10. The power conversion circuit includes: a first protection switch coupled between the inverter and the wireless charging transmitting end and coupled to one of the three half-bridge circuits; a second protection switch coupled between the inverter and the motor and coupled to one of the three half-bridge circuits; further comprising the first protection switch is turned on during the second period based on a first operation signal, and the second protection switch is turned off during the second period based on a second operation signal; The inverter according to claim 9 .

11. The power conversion circuit includes: a converter coupled between the inverter and the battery, for converting the supply voltage rectified by the inverter and detecting the voltage and current of the battery; The inverter of claim 9 , wherein the processor determines a plurality of charging modes according to the voltage and the current of the battery detected by the converter.

12. The converter comprises: a converter inductor; a capacitor coupled to the converter inductor and the battery; a first converter switch coupled to the converter inductor and the inverter, and turned on during the first period based on a first control signal; a second converter switch coupled to the converter inductor, the capacitor, the inverter, and the battery, and turned off during the first period based on a second control signal; The inverter of claim 11 including:

13. The inverter of claim 12 , wherein the processor turns on the first converter switch and the inverter during the first time period so that the battery powers the motor.

14. The converter comprises: a converter inductor; a capacitor coupled to the transformer inductor; a diode coupled to the converter inductor, the capacitor, the inverter, and the battery; a changeover switch coupled to the converter inductor and turned on based on the control signal during the first period; The inverter of claim 11 including:

15. 15. The inverter of claim 14, wherein the processor controls the three half-bridge circuits of the inverter during the first time period so that the battery powers the motor through the diodes of the converter.

16. 16. The inverter according to claim 15, wherein the processor rectifies the supply power by controlling on / off of two of the three half-bridge circuits during the second period so that the supply power charges the battery to the target capacity, and converts the rectified supply power by controlling on / off of the changeover switch of the converter and the other one of the three half-bridge circuits.

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