Power supply circuit structure and power supply method for commercial vehicle and commercial vehicle

Abstract

The present invention provides a power supply circuit structure, power supply method, and commercial vehicle for a commercial vehicle, belonging to the field of automotive technology. The circuit structure includes: a power battery; a step-down module for stepping down the DC power output by the power battery and outputting it; a DCAC module electrically connected to the step-down module and for converting the DC power output by the step-down module into AC power output; a circuit conversion module electrically connected to the DCAC module, a load, and a socket, respectively; and a control module for controlling the operation of the step-down module and the DCAC module, and controlling the circuit conversion module to connect the load to the DCAC module, or controlling the circuit conversion module to connect the load to a socket connected to an AC power source. The present invention solves the problem that the power supply circuit structure of a commercial vehicle is difficult to meet the actual use requirements of the commercial vehicle by controlling the circuit conversion module to connect the load to the DCAC module, or controlling the circuit conversion module to connect the load to a socket connected to an AC power source.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a power supply circuit structure and a power supply method for a commercial vehicle, and the commercial vehicle. Background Art

[0002] Passenger cars have the function of externally discharging 220V / AC, and the solution they adopt is a two-way OBC (on-board charger), that is, using the AC charging port and the on-board OBC to achieve external discharge.

[0003] Existing commercial vehicles use a 24V low-voltage battery to convert to 220V / AC when discharging power externally, lacking the ability to directly convert high-voltage power to 220V / AC. Some commercial vehicles also utilize a reserved high-voltage connector (containing the bodywork pre-charge and main contactor) to provide DC power to the bodywork, but this connector, along with the bodywork as a whole, cannot power external devices.

[0004] Existing commercial vehicles use a 24V / DC to 220V / AC converter, with the most common converters being 500W and 1kW. This is too low a power source to meet truck drivers' daily needs, such as cooking. In summary, the existing power supply circuit structure for commercial vehicles is insufficient to meet the actual needs of commercial vehicles. Summary of the Invention

[0005] In view of this, it is necessary to provide a power supply circuit structure, a power supply method and a commercial vehicle for a commercial vehicle, so as to solve the technical problem that the existing power supply circuit structure of a commercial vehicle is difficult to meet the actual use requirements of the commercial vehicle.

[0006] In order to solve the above problems, the present invention provides a power supply circuit structure for a commercial vehicle, comprising:

[0007] Power batteries;

[0008] a step-down module, electrically connected to the power battery, for stepping down the DC power outputted by the power battery for output;

[0009] A DCAC module, electrically connected to the step-down module, for converting the direct current output by the step-down module into alternating current output;

[0010] a circuit conversion module, electrically connected to the DCAC module, the load, and the socket;

[0011] The control module is used to control the operation of the step-down module and the DCAC module, and to control the circuit conversion module to connect the load to the DCAC module, or to control the circuit conversion module to connect the load to a socket connected to an AC power supply.

[0012] In a possible implementation, the DCAC module includes: a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, and a sixth switching tube;

[0013] The first switching tube and the fourth switching tube are connected in series to form a first switching tube group, the second switching tube and the fifth switching tube are connected in series to form a second switching tube group, the third switching tube and the sixth switching tube are connected in series to form a third switching tube group, and the first switching tube group, the second switching tube group, and the third switching tube group are connected in parallel;

[0014] The control module is connected to the control ends of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube respectively, and is used to control the conduction and disconnection of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube.

[0015] In a possible implementation, the step-down module includes: a seventh switch tube, a diode, an inductor, and a capacitor;

[0016] The seventh switch tube, the inductor, and the capacitor are sequentially connected in series. The inductor and the capacitor are then connected in parallel with the diode. The capacitors are respectively connected in parallel with the first group of switch tubes, the second group of switch tubes, and the third group of switch tubes.

[0017] The control module is also connected to the control end of the seventh switch tube and is used to control the on and off of the seventh switch tube.

[0018] In a possible implementation, the circuit conversion module includes: a first conversion switch and a second conversion switch;

[0019] The first transfer switch is connected to the second group of switch tubes and the socket respectively, and the second transfer switch is connected to the first group of switch tubes and the socket respectively;

[0020] The control module is further configured to control the circuit conversion module to output the alternating current from the DCAC module or the alternating current from the socket by controlling the on and off of the first conversion switch and the second conversion switch.

[0021] In a possible implementation, the load includes: a motor;

[0022] A first end of the first transfer switch is connected between the two switch tubes of the second group of switch tubes, a second end of the first transfer switch is connected to the V phase end of the motor, and a third end of the first transfer switch is connected to the socket; a middle portion between the two switch tubes of the third group of switch tubes is connected to the W phase end of the motor;

[0023] A first end of the second transfer switch is connected to the middle of the two switch tubes of the first group of switch tubes, a second end of the second transfer switch is connected to the U phase end of the motor, and a third end of the second transfer switch is connected to the socket;

[0024] The control module is further configured to control the first conversion switch to connect the second group of switch tubes to the V phase end of the motor, or to control the first conversion switch to connect the V phase end of the motor to the socket;

[0025] The control module is further configured to control the second conversion switch to connect the first group of switch tubes to the U-phase end of the motor, or to control the second conversion switch to connect the U-phase end of the motor to the socket.

[0026] In one possible implementation, the control module is configured to, when the vehicle is in a ready state, control the first conversion switch and the second conversion switch to connect the U-phase end and the V-phase end of the motor to the first group of switch tubes and the second group of switch tubes, respectively, and control the seventh switch tube to be normally on, and then control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube to be turned on in a set order to output three-phase electricity.

[0027] In one possible implementation, the control module is used to control the first conversion switch and the second conversion switch when the vehicle is in a non-ready state, connect the U-phase end and the V-phase end of the motor to the socket, and control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned on in a set order to output single-phase electricity.

[0028] In a possible implementation, the control module is further configured to adjust a duty cycle of the seventh switch tube to control the voltage received by the motor within a target range.

[0029] On the other hand, the present invention further provides a method for obtaining electricity for a commercial vehicle, the method being applied to any of the above-mentioned power obtaining circuit structures, the method comprising:

[0030] Based on the step-down module, the DC power output by the power battery is stepped down and then output;

[0031] Converting the DC power output by the step-down module into AC power output based on the DCAC module;

[0032] Based on the control module, the circuit conversion module is controlled to connect the load to the DCAC module, or the circuit conversion module is controlled to connect the load to a socket connected to an AC power source.

[0033] On the other hand, the present invention further provides a commercial vehicle, comprising the power supply circuit structure of the commercial vehicle described in any one of the above items.

[0034] The beneficial effect of adopting the above-mentioned implementation method is as follows: the power supply circuit structure, power supply method and commercial vehicle of the commercial vehicle provided by the present invention control the operation of the step-down module and the DCAC module through the control module, and control the circuit conversion module to connect the load to the DCAC module, or control the circuit conversion module to connect the load to the socket connected to the AC power supply. When the load needs to be powered by the power battery, for example, when the vehicle is in a ready state, the circuit conversion module can be controlled to connect the load to the DCAC module. When 220V AC power needs to be provided through the socket, for example, when the vehicle is in a non-ready state, the circuit conversion module can be controlled to connect the load to the socket connected to the AC power supply. Providing AC power to the load through the socket can meet daily needs such as cooking for the driver, and can power engineering equipment and daily needs outdoors, while meeting high power requirements. At this time, there is no need to step down and convert the voltage output by the power battery, and no additional electrical components are needed. This can solve the technical problem that the existing power supply circuit structure of commercial vehicles is difficult to meet the actual use needs of commercial vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0036] Figure 1 A principle block diagram of an embodiment of a power supply circuit structure for a commercial vehicle provided by the present invention;

[0037] Figure 2 A schematic diagram of the specific structure of an embodiment of the power supply circuit structure of a commercial vehicle provided by the present invention;

[0038] Figure 3 A schematic diagram of three-phase power control and high-voltage current direction in the power supply circuit structure of a commercial vehicle provided by the present invention;

[0039] Figure 4 A schematic diagram of single-phase AC power output and voltage flow in the power supply circuit structure of a commercial vehicle provided by the present invention;

[0040] Figure 5 This is a flow chart of an embodiment of the power supply method for a commercial vehicle provided by the present invention. DETAILED DESCRIPTION

[0041] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0042] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more.

[0043] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or device comprising a series of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, methods, products or devices.

[0044] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0045] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present invention. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute a separate or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0046] The present invention provides a power supply circuit structure, a power supply method and a commercial vehicle for a commercial vehicle, which are described below respectively.

[0047] like Figure 1 As shown, the present invention provides a power supply circuit structure for a commercial vehicle, comprising:

[0048] Power battery 101;

[0049] The step-down module 102 is electrically connected to the power battery 101 and is used to step down the DC power outputted by the power battery 101 and output it;

[0050] The DCAC module 103 is electrically connected to the step-down module 102 and is used to convert the direct current output by the step-down module 102 into alternating current output;

[0051] The circuit conversion module 104 is electrically connected to the DCAC module 103, the load 106 and the socket 107 respectively;

[0052] The control module 105 is used to control the operation of the step-down module 102 and the DCAC module 103, and to control the circuit conversion module 104 to connect the load 106 to the DCAC module 103, or to control the circuit conversion module 104 to connect the load 106 to the socket 107 connected to the AC power supply.

[0053] It is understood that the power supply circuit structure provided by the present invention utilizes the vehicle's existing DCAC module 103 and control module 105. The DCAC module 103 comprises switches Q1, Q2, Q3, Q4, Q5, and Q6. The load 106 in the present invention can be a steering motor or an air pump motor. Specifically, the module that powers the steering motor or air pump motor is reused with the module that controls the bridge arms Q1, Q2, Q3, Q4, Q5, and Q6. By adding the control logic and circuit conversion module 104 and the step-down module 102, 220V AC single-phase power output and three-phase power output for the motor are achieved.

[0054] Priority for 220V AC power and motor power: Motor power takes priority, with 220V AC power being the lowest. This means that when the vehicle is driving, there is no 220V output. When parked, the 220V socket 107 switch and control module 105 output DC / AC two-phase power to the socket 107, providing 220V AC power. This also cuts off power to the motor to prevent abnormal operation.

[0055] The power supply circuit structure provided by the present invention is composed of the following components: power battery 101, step-down module 102, DCAC module 103, circuit conversion module 104, 220V socket 107 and control module 105. The functions of each module are as follows:

[0056] Power battery 101: provides power to the entire vehicle;

[0057] Voltage reduction module 102: reduces the high voltage of the power battery 101 to the voltage required by the vehicle;

[0058] DCAC module 103: a device that converts DC power into AC power and drives the DCAC module 103 to operate according to different requirements;

[0059] Circuit conversion module 104: transmits the alternating current output by DCAC to the corresponding load 106 according to different needs;

[0060] 220V socket 107: provides a household electricity interface and sends corresponding signals to the control module 105;

[0061] Control module 105: adjusts the operation of each module according to different requirements.

[0062] In some embodiments, the DCAC module 103 includes: a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube, and a sixth switching tube;

[0063] The first switching tube and the fourth switching tube are connected in series to form a first switching tube group, the second switching tube and the fifth switching tube are connected in series to form a second switching tube group, the third switching tube and the sixth switching tube are connected in series to form a third switching tube group, and the first switching tube group, the second switching tube group, and the third switching tube group are connected in parallel;

[0064] The control module 105 is connected to the control ends of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube respectively, and is used to control the conduction and disconnection of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube.

[0065] Understandably, the reference Figure 2 , Figure 2 In the figure, Q1 represents the first switch tube, Q2 represents the second switch tube, Q3 represents the third switch tube, Q4 represents the fourth switch tube, Q5 represents the fifth switch tube, and Q6 represents the sixth switch tube.

[0066] In some embodiments, the step-down module 102 includes: a seventh switch tube, a diode, an inductor, and a capacitor;

[0067] The seventh switch tube, the inductor, and the capacitor are sequentially connected in series. The inductor and the capacitor are then connected in parallel with the diode. The capacitors are respectively connected in parallel with the first group of switch tubes, the second group of switch tubes, and the third group of switch tubes.

[0068] The control module 105 is also connected to the control terminal of the seventh switch tube, and is used to control the on and off of the seventh switch tube.

[0069] It is understandable that Figure 2 In FIG, Q7 represents the seventh switch tube, D represents a diode, C represents a capacitor, and L represents an inductor.

[0070] In some embodiments, the circuit conversion module 104 includes: a first conversion switch and a second conversion switch;

[0071] The first transfer switch is connected to the second group of switch tubes and the socket 107 respectively, and the second transfer switch is connected to the first group of switch tubes and the socket 107 respectively;

[0072] The control module 105 is further configured to control the circuit conversion module 104 to output the AC power from the DCAC module 103 or the AC power from the socket 107 by controlling the on and off of the first conversion switch and the second conversion switch.

[0073] It is understandable that Figure 2 In FIG, K1 represents the first transfer switch, and K2 represents the second transfer switch.

[0074] In some embodiments, the load 106 includes: a motor;

[0075] A first end of the first transfer switch is connected to the middle of the two switch tubes of the second group of switch tubes, a second end of the first transfer switch is connected to the V phase end of the motor, and a third end of the first transfer switch is connected to the socket 107; a middle of the two switch tubes of the third group of switch tubes is connected to the W phase end of the motor;

[0076] A first end of the second transfer switch is connected to the middle of the two switch tubes of the first group of switch tubes, a second end of the second transfer switch is connected to the U phase end of the motor, and a third end of the second transfer switch is connected to the socket 107;

[0077] The control module 105 is further configured to control the first conversion switch to connect the second group of switch tubes to the V phase end of the motor, or to control the first conversion switch to connect the V phase end of the motor to the socket 107;

[0078] The control module 105 is further configured to control the second conversion switch to connect the first group of switching tubes to the U-phase end of the motor, or to control the second conversion switch to connect the U-phase end of the motor to the socket 107 .

[0079] In some embodiments, the control module 105 is used to control the first conversion switch and the second conversion switch when the vehicle is in a ready state, connect the U-phase end and the V-phase end of the motor to the first group of switch tubes and the second group of switch tubes respectively, and control the seventh switch tube to be normally on, and then control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned on in a set order to output three-phase electricity.

[0080] It is understood that the vehicle DCAC module 103 driving output control:

[0081] refer to Figure 3After the vehicle is connected to high voltage, the HCU (main controller of the hybrid system) sends a READY signal → the control module 105 controls K1 and K2 → outputs the U-phase and V-phase of the motor → feedback the connection status to the control module 105 → the control module 105 receives the motor drive signal → the control module 105 controls Q7 to be normally on → the control module 105 opens the tubes in sequence → outputs three-phase electricity.

[0082] Among them, the HCU sends a READY signal, and the vehicle is in a ready state.

[0083] At any given moment, three switches in the inverter circuit (i.e., DCAC module 103) are turned on. These switches are sequentially switched on in six groups: Q1, Q6, Q2, Q6, Q2, Q4, Q2, Q4, Q3, Q4, Q3, Q5, Q3, Q5, Q1, Q5, Q1, and Q6. Within a single cycle, there are six conduction modes. The line voltages are both positive and negative, and are square waves with a width of 120 degrees, each with a phase difference of 120 degrees.

[0084] In some embodiments, the control module 105 is used to control the first conversion switch and the second conversion switch when the vehicle is in a non-ready state, connect the U-phase end and the V-phase end of the motor to the socket 107, and control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned on in a set order to output single-phase electricity.

[0085] It is understood that the vehicle DCAC module 103 controls the output of the 220V AC module:

[0086] refer to Figure 4 The vehicle is in a non-READY state (i.e., non-prepared state) → the HCU sends a READY signal → the 220V AC switch outputs a power-taking signal → the control module 105 controls K1 and K2 → the output connects the 220V AC circuit → the control module 105 opens the tubes in sequence → outputs single-phase power.

[0087] The inverter circuit achieves AC output by adjusting the switch on-off sequence and duty cycle. When the switches are on, both switches K1 and K2 are open simultaneously, and Q1, Q5, Q2, and Q4 are turned on in sequence. The switching frequency of the two switch groups is 60 Hz, and within one cycle, there are six conduction modes.

[0088] In some embodiments, the control module 105 is further configured to adjust the duty cycle of the seventh switch tube to control the voltage received by the motor within a target range.

[0089] It is understandable that in order to meet the output requirement of the 220V step-down module 102, the control module 105 controls the duty cycle of the Q7 to achieve voltage regulation and ensure that the back-end AC output voltage is within a controllable range.

[0090] In some embodiments, the control module 105 also has a protection function:

[0091] 1. Control module 105 switching protection function: Control module 105 performs on-off detection on K1 and K2 to ensure normal function. If a switching failure occurs, the controller reports the fault and stops output.

[0092] 2. Overload protection function of the control module 105: The control module 105 monitors the phase current and automatically disconnects the output when the external power is too large.

[0093] In summary, the solution provided by the present invention focuses on:

[0094] 1. DCAC control and module reuse: The Q1, Q2, Q4, and Q5 bridge arms are reused to meet the vehicle's operating requirements when driving and the 220V requirement when parked. This also provides fault protection, reduces parts count, and lowers vehicle costs.

[0095] 2. Circuit conversion module 104: By adding a simple and low-cost circuit conversion module 104, three-phase motor and single-phase household electricity output can be achieved.

[0096] 3. Vehicle control and 220V power switch: The 220V power switch has signal feedback to accurately feed the signal back to the vehicle controller; the vehicle control implements hardware protection, fault reporting and priority.

[0097] The power supply circuit structure of the commercial vehicle provided by the present invention controls the operation of the step-down module 102 and the DCAC module 103 through the control module 105, and controls the circuit conversion module 104 to connect the load 106 to the DCAC module 103, or controls the circuit conversion module 104 to connect the load 106 to the socket 107 connected to the AC power supply. When the power battery 101 is needed to supply power to the load 106, for example, when the vehicle is in a ready state, the circuit conversion module 104 can be controlled to connect the load 106 to the DCAC module 103, and when the socket 107 is needed to supply power to the load 106, the circuit conversion module 104 can be controlled to connect the load 106 to the DCAC module 103. When 220V AC power is supplied, for example, when the vehicle is in a non-ready state, the circuit conversion module 104 can be controlled to connect the load 106 to the socket 107 connected to the AC power supply. By providing AC power to the load 106 through the socket 107, it can meet the needs of daily life, such as the driver's cooking, and power engineering equipment and daily needs outdoors, while meeting high power requirements. At this time, there is no need to step down and convert the voltage output by the power battery 101, nor is there any need to add additional electrical components. This can solve the technical problem that the existing power supply circuit structure of commercial vehicles is difficult to meet the actual use needs of commercial vehicles.

[0098] The present invention also provides a method for obtaining electricity for a commercial vehicle, which is applied to any of the above-mentioned circuit structures for obtaining electricity, such as Figure 5 As shown, the method includes:

[0099] S501: The voltage reduction module 102 reduces the voltage of the DC power outputted by the power battery 101 and outputs the DC power;

[0100] S502, converting the direct current output by the step-down module 102 into alternating current output based on the DCAC module 103;

[0101] S503 : Based on the control module 105 , the circuit conversion module 104 is controlled to connect the load 106 to the DCAC module 103 , or the circuit conversion module 104 is controlled to connect the load 106 to the socket 107 connected to the AC power supply.

[0102] The present invention also provides a commercial vehicle, which includes the power supply circuit structure of the commercial vehicle described in any one of the above items.

[0103] The above is a detailed introduction to the power supply circuit structure, power supply method and commercial vehicle provided by the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea; at the same time, for those skilled in the art, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. A power supply circuit structure for a commercial vehicle, characterized in that: include: Power batteries; a step-down module, electrically connected to the power battery, for stepping down the DC power outputted by the power battery for output; A DCAC module, electrically connected to the step-down module, for converting the direct current output by the step-down module into alternating current output; a circuit conversion module, electrically connected to the DCAC module, the load, and the socket; a control module, configured to control the operation of the step-down module and the DCAC module, and to control the circuit conversion module to connect the load to the DCAC module, or to control the circuit conversion module to connect the load to a socket connected to an AC power source; The DCAC module includes: a first switching tube, a second switching tube, a third switching tube, a fourth switching tube, a fifth switching tube and a sixth switching tube; The first switching tube and the fourth switching tube are connected in series to form a first switching tube group, the second switching tube and the fifth switching tube are connected in series to form a second switching tube group, the third switching tube and the sixth switching tube are connected in series to form a third switching tube group, and the first switching tube group, the second switching tube group, and the third switching tube group are connected in parallel; The control module is connected to the control terminals of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube, respectively, and is used to control the on and off of the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube, and the sixth switch tube; The circuit conversion module includes: a first conversion switch and a second conversion switch; The first transfer switch is connected to the second group of switch tubes and the socket respectively, and the second transfer switch is connected to the first group of switch tubes and the socket respectively; The control module is further configured to control the circuit conversion module to output the alternating current from the DCAC module or the alternating current from the socket by controlling the on and off of the first conversion switch and the second conversion switch.

2. The power supply circuit structure of a commercial vehicle according to claim 1, characterized in that: The step-down module includes: a seventh switch tube, a diode, an inductor and a capacitor; The seventh switch tube, the inductor, and the capacitor are sequentially connected in series. The inductor and the capacitor are then connected in parallel with the diode. The capacitors are respectively connected in parallel with the first group of switch tubes, the second group of switch tubes, and the third group of switch tubes. The control module is also connected to the control end of the seventh switch tube and is used to control the conduction and disconnection of the seventh switch tube.

3. The power supply circuit structure of a commercial vehicle according to claim 2, characterized in that: The load includes: a motor; A first end of the first transfer switch is connected between the two switch tubes of the second group of switch tubes, a second end of the first transfer switch is connected to the V phase end of the motor, and a third end of the first transfer switch is connected to the socket; a middle portion between the two switch tubes of the third group of switch tubes is connected to the W phase end of the motor; A first end of the second transfer switch is connected to the middle of the two switch tubes of the first group of switch tubes, a second end of the second transfer switch is connected to the U phase end of the motor, and a third end of the second transfer switch is connected to the socket; The control module is further configured to control the first conversion switch to connect the second group of switch tubes to the V phase end of the motor, or to control the first conversion switch to connect the V phase end of the motor to the socket; The control module is further configured to control the second conversion switch to connect the first group of switch tubes to the U-phase end of the motor, or to control the second conversion switch to connect the U-phase end of the motor to the socket.

4. The power supply circuit structure of a commercial vehicle according to claim 3, characterized in that: The control module is configured to, when the vehicle is in a ready state, control the first transfer switch and the second transfer switch to connect the U-phase terminal and the V-phase terminal of the motor to the first group of switching tubes and the second group of switching tubes, respectively, and control the seventh switching tube to be normally on, and then control the first switching tube, the second switching tube, the third switching tube, the fourth switching tube, the fifth switching tube, and the sixth switching tube to be turned on in a set sequence to output three-phase electricity.

5. The power supply circuit structure of a commercial vehicle according to claim 3, characterized in that: The control module is used to control the first conversion switch and the second conversion switch when the vehicle is in a non-ready state, connect the U-phase end and the V-phase end of the motor to the socket, and control the first switch tube, the second switch tube, the third switch tube, the fourth switch tube, the fifth switch tube and the sixth switch tube to be turned on in a set sequence to output single-phase electricity.

6. The power supply circuit structure of a commercial vehicle according to claim 5, characterized in that: The control module is further configured to adjust the duty cycle of the seventh switch tube so as to control the voltage received by the motor within a target range.

7. A method for obtaining electricity for a commercial vehicle, characterized in that: The method is applied to the power taking circuit structure according to any one of claims 1 to 6, and the method includes: Based on the step-down module, the DC power output by the power battery is stepped down and then output; Converting the DC power output by the step-down module into AC power output based on the DCAC module; Based on the control module, the circuit conversion module is controlled to connect the load to the DCAC module, or the circuit conversion module is controlled to connect the load to a socket connected to an AC power source.

8. A commercial vehicle, characterized in that: A power supply circuit structure for a commercial vehicle comprising the structure described in any one of claims 1 to 6.

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