Power supply system and control method thereof

Abstract

The invention provides a power supply system and a control method thereof, the power supply system comprises an alternating current conversion module, a vehicle-mounted power supply, a power storage battery, a power supply distribution module and electric equipment, and the power supply distribution module is connected with the electric equipment to output an applicable power supply to supply power to the electric equipment; the alternating current conversion module is connected with an external alternating current power supply to convert into a direct current power supply, the vehicle-mounted power supply is connected with the external alternating current power supply and is connected with the power storage battery to convert the external alternating current power supply into an applicable power supply to charge the power storage battery, and the alternating current conversion module is connected with the vehicle-mounted power supply and the power storage battery in parallel; the alternating current conversion module and the power storage battery are both connected with the power distribution module, and in a working state, one of the alternating current conversion module and the power storage battery is connected with the power distribution module. The power supply system is used for improving the cruising ability and the operation energy efficiency of the power supply system, facilitates rapid transfer of the excavator and can be suitable for various scenes.

Description

Technical Field

[0001] The present invention relates to the technical field of electric engineering machinery, and in particular to a power supply system and a control method thereof. Background Art

[0002] As a kind of engineering machinery widely used in roads, mining and infrastructure, excavators have sufficient market demand, which not only promotes the development of excavator manufacturers, but also prompts the continuous emergence of excavator products with superior performance in the market. The entire excavator industry presents an attitude of a hundred schools of thought contending and a hundred flowers blooming.

[0003] At present, there are two main power supply systems for excavators. The first is a pure electric system, which uses the on-board power battery as the energy source and is recharged through an external DC charging pile. On the one hand, the pure electric system is limited by factors such as the spatial layout of the excavator and the energy density of the power battery, resulting in limited capacity of the power battery and insufficient endurance, making it difficult to meet the needs of long-term continuous operation. On the other hand, there is usually a certain distance between the charging pile and the operating position of the excavator. Some excavators, such as crawler electric excavators, have a slow walking speed, making it difficult to charge and recharge.

[0004] The second type is the towing power system, which uses an external three-phase power supply as the energy source and generally uses a three-phase asynchronous motor as the main driving source. On the one hand, the speed of the three-phase asynchronous motor cannot be adjusted or the adjustment range is small, which is not conducive to the efficient and energy-saving operation of the excavator. On the other hand, when the excavator is transferred to the site, it is difficult to drag the cable on and off the trailer, and the site is limited.

[0005] Therefore, excavators are in urgent need of a power supply system to solve the problems of insufficient endurance of the pure electric system, poor energy efficiency of the towing system, and difficulty in transfer. Summary of the invention

[0006] In order to overcome at least one of the defects of the above-mentioned prior art, the present invention provides a power supply system and a control method thereof to improve the endurance and operating energy efficiency of the power supply system, facilitate the rapid transfer of the excavator, and can be applied to a variety of scenarios.

[0007] The first aspect of the present invention provides a power supply system, comprising: an AC conversion module, an on-board power supply, a power storage battery, a power distribution module and an electric device, wherein the power distribution module is connected to the electric device to output an applicable power supply to power the electric device;

[0008] The AC conversion module is connected to an external AC power supply to convert it into a DC power supply, and the on-board power supply is connected to the external AC power supply and connected to the power battery to convert the external AC power supply into a suitable power supply for charging the power battery. The AC conversion module is arranged in parallel with the on-board power supply and the power battery;

[0009] The AC conversion module and the power storage battery are both connected to the power distribution module. In the working state, one of the AC conversion module and the power storage battery is connected to the power distribution module.

[0010] As an optional embodiment, in the first aspect of the present invention, the vehicle power supply includes an on-board charger and a DC converter that are connected and arranged, the on-board charger is connected to an external AC power supply to convert it into a DC power supply, and the DC converter is connected to a power battery to convert the DC power supply into a suitable power supply for charging the power battery.

[0011] As an optional implementation, in the first aspect of the present invention, the AC conversion module and the power battery are both connected to the power distribution module via a DC converter.

[0012] As an optional implementation, in the first aspect of the present invention, relays are provided on the AC conversion module and the circuit between the power battery and the power distribution module. In the working state, the on-off states of the two relays are opposite.

[0013] As an optional implementation, in the first aspect of the present invention, the vehicle-mounted power supply and the AC conversion module are connected in parallel to an AC junction box, and the AC junction box is connected to an external AC power supply.

[0014] As an optional implementation, in the first aspect of the present invention, a leakage protection device is provided between the vehicle-mounted power supply and the AC conversion module and the external AC power supply.

[0015] As an optional embodiment, in the first aspect of the present invention, the power distribution module and the vehicle power supply are connected to the whole machine controller through a communication network, the whole machine controller is connected to the AC conversion module through the AC module controller via the communication network, and is connected to the power battery through the battery management system.

[0016] As an optional implementation, in the first aspect of the present invention, the whole machine controller is connected to an instrument via a communication network, and the instrument is used to set the on / off state of the AC conversion module and the power battery and power distribution module in the working state.

[0017] A second aspect of the present invention provides a control method for a power supply system, comprising the following steps:

[0018] S1. The whole machine controller obtains the AC input voltage to determine whether there is an external AC power supply connected. If so, the whole machine controller controls the AC conversion module to connect the external AC power supply to convert it into DC power, and outputs the applicable power supply to the power-consuming equipment through the power distribution module; if not, the whole machine controller controls the power storage battery to output the applicable power supply to the power-consuming equipment through the power distribution module;

[0019] Alternatively, S2, the user sets the power storage battery as the power source in the instrument to transmit the signal to the whole machine controller, and the whole machine controller controls the power storage battery to output the applicable power to the power-consuming equipment through the power distribution module.

[0020] As an optional embodiment, in the second aspect of the present invention, in S1, when an external AC power supply is connected, the whole machine controller obtains the remaining power of the power battery. When the remaining power of the power battery is low, the whole machine controller controls the on-board power supply to connect to the external AC power supply to charge the power battery to no more than the maximum capacity of the power battery.

[0021] As an optional embodiment, in the second aspect of the present invention, in S2, the whole machine controller obtains the AC input voltage to determine whether an external AC power supply is connected. If so, the whole machine controller controls the vehicle power supply to connect to the external AC power supply to charge the power battery to a capacity not exceeding the maximum capacity of the power battery.

[0022] The beneficial effects of the power supply system and the control method thereof provided by the present invention are as follows:

[0023] By setting the AC conversion module in parallel with the vehicle power supply and the power battery, two power supply modes can be provided for the excavator. The first is powered by the power battery, and the second is that the AC conversion module is connected to an external AC power supply to supply power in a towing mode. In this way, the two power supply modes can be flexibly switched during the excavator's power consumption, thereby improving the endurance and operating energy efficiency of the power supply system, and facilitating the rapid transfer of the excavator, which can be applied to a variety of scenarios.

[0024] Moreover, as long as there is an external AC power supply, the power battery can be charged at any time to ensure that the power battery has sufficient power, thereby improving the endurance when the power battery is used for power supply. At the same time, the power battery does not need to be large in capacity, which can greatly reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a power supply system of Example 1;

[0026] Figure 2 is a schematic diagram of the power supply system of Example 1;

[0027] Figure 3 A communication network diagram of the power supply system of Example 1;

[0028] Figure 4 It is a flow chart of power mode switching of the power supply system of embodiments 1 and 2;

[0029] Figure 5 This is a flow chart of a pure electric mode in a control method of a power supply system according to Embodiment 2;

[0030] Figure 6 This is a flow chart of the automatic mode in the control method of the power supply system of Example 2.

[0031] The meanings of the reference numerals are as follows:

[0032] 1. AC conversion module; 2. On-board charger; 3. Power battery; 4. Power distribution module; 5. AC junction box; 6. Whole machine controller; 7. AC module controller; 8. Battery management system; 9. Instrument; 10. Power system; 11. Electric drive accessories. DETAILED DESCRIPTION

[0033] For better understanding and implementation, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0034] In the description of the present invention, it should be noted that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc. indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0036] Example 1

[0037] See also Figure 1 , this embodiment provides a power supply system, including: an AC conversion module 1, an on-board power supply, a power storage battery 3, a power distribution module 4 and an electric device, wherein the power distribution module 4 is connected to the electric device to output an applicable power supply to power the electric device. The AC conversion module 1 is connected to an external AC power supply to convert it into a DC power supply, the on-board power supply is connected to an external AC power supply and connected to the power storage battery 3 to convert the external AC power supply into an applicable power supply to charge the power storage battery 3, and the AC conversion module 1 is arranged in parallel with the on-board power supply and the power storage battery 3. The AC conversion module 1 and the power storage battery 3 are both connected to the power distribution module 4, and in the working state, one of the AC conversion module 1 and the power storage battery 3 is connected to the power distribution module 4.

[0038] Among them, the AC conversion module 1 is an AC / DC converter, which converts the external AC power supply into a DC power supply after rectification. The on-board power supply is used to convert the external AC power supply into an applicable DC power supply to charge the power battery 3. The power battery 3 and the AC conversion module 1 are both used to transmit the power supply to the power distribution module 4. The power distribution module 4 can be an all-in-one controller to distribute the applicable power to the corresponding power-consuming equipment. The power-consuming equipment includes a power system 10 and electric drive accessories 11. The power system 10 includes a permanent magnet synchronous motor, an inverter, etc. The electric drive accessories 11 include a DC converter (DC-DC), an air-conditioning compressor, etc. There are many types of excavator power equipment, which are not listed here one by one.

[0039] In this way, the power supply system can provide two power supply modes. In the first mode, the AC conversion module 1 and the power distribution module 4 are disconnected, and the power storage battery 3 and the power distribution module 4 are connected. The power storage battery 3 serves as a power supply to supply power to the electrical equipment through the power distribution module 4. This mode is generally used in scenarios where there is no external AC power supply access, or in situations where the excavator is transferred to a site, so as to avoid the difficulty of dragging the cable on and off the trailer, and improve the convenience of the site transfer of the excavator.

[0040] The second mode is that the power battery 3 is disconnected from the power distribution module 4, and the AC conversion module 1 is connected to the power distribution module 4. After the external AC power source is used as the power source and the AC power source is converted into a DC power source by the AC conversion module 1, the power distribution module 4 supplies power to the power equipment. This mode is generally used in scenarios where there is an external AC power source and the excavator needs to work continuously for a long time to improve the endurance of the power supply system. In addition, in this mode, if the power battery 3 is insufficient, the external AC power source can be used to charge the power battery 3 through the vehicle power supply, and the charging process of the power battery 3 and the process of the external AC power source supplying power to the power equipment through the AC conversion module 1 and the power distribution module 4 do not interfere with each other, and have no effect on the charging efficiency of the power battery 3 and the efficiency of supplying power to the power equipment, and both can be carried out efficiently. In this way, as long as there is an external AC power source, the power battery 3 can be charged at any time to ensure that the power battery 3 has sufficient power, thereby improving the endurance when the power battery 3 is used for power supply. At the same time, the power battery 3 does not need to select a large capacity, which can greatly reduce the cost.

[0041] It can be seen that the power supply system has greatly improved the endurance compared to the system that only uses the power battery 3 as the power supply, and has improved the convenience of site transfer of the excavator compared to the towing power system. In this way, the power supply system can meet various application scenarios of the excavator, and users can flexibly choose according to actual needs, with high reliability.

[0042] In addition, the electrical equipment uses permanent magnet synchronous motors as drive motors, which can adjust the speed to different levels according to different working conditions, so that the speed can be accurately matched to the specific working conditions, with the characteristics of energy saving and high efficiency.

[0043] Based on this, combined Figure 1-2 The power supply system of this embodiment is described in detail.

[0044] The vehicle power supply includes an on-board charger (OBC) 2 and a DC converter. The on-board charger 2 is connected to an external AC power source to convert it into a DC power source. The DC converter is connected to a power battery 3 to convert the DC power source into a suitable power source for charging the power battery 3.

[0045] The external AC power source, the onboard charger 2, the DC converter and the power storage battery 3 are connected in series in sequence, and the external AC power source is converted into a DC power source by the onboard charger 2, and then the voltage is reduced by the DC converter to be suitable for charging the power storage battery 3. In this way, the power storage battery 3 can be charged efficiently and safely.

[0046] The AC conversion module 1 and the power storage battery 2 are both connected to the power distribution module 4 via a DC converter. It should be noted that the DC converters applicable to the AC conversion module 1 and the power storage battery 2 can be of different types, as long as they can be converted into a suitable voltage power supply to be distributed to the power consumption equipment through the power distribution module 4.

[0047] Relays are provided on the circuits between the AC conversion module 1 and the power battery 3 and the power distribution module 4. In the working state, the on-off states of the two relays are opposite. Specifically, a relay K2 is provided on the circuit between the AC conversion module 1 and the power distribution module 4, and a relay K1 is provided on the circuit between the power battery (Pack) 3 and the power distribution module 4. When the power battery is needed as a power source, the relay K1 is turned on and the relay K2 is turned off. Conversely, the relay K1 is turned off and the relay K2 is turned on. In this way, the power source mode can be easily and accurately switched by the opposite on-off states of the relay K1 and the relay K2, so as to realize the flexible selection of the power source.

[0048] On this basis, multiple electrical devices are connected in parallel to the power distribution module 4, and the on and off of a single circuit are controlled by a relay to ensure that the use status of the electrical devices does not interfere with each other.

[0049] In addition, the vehicle power supply and the AC conversion module 1 are connected in parallel to the AC junction box 5, and the AC junction box 5 is connected to the external AC power supply. The AC junction box 5 is set to facilitate the vehicle power supply and the AC conversion module 1 to be connected to the external AC power supply at the same time, so as to ensure that the charging of the power storage battery 3 and the external AC power supply to the power-consuming equipment through the AC conversion module 1 and the power distribution module 4 do not interfere with each other and are both carried out efficiently.

[0050] In addition, a residual current device (RCD) is provided between the vehicle-mounted power supply and the AC conversion module 1 and the external AC power supply to improve the safety of electricity use.

[0051] See also Figure 3 The power distribution module 4 and the vehicle power supply are connected to the whole machine controller 6 through the communication network. The whole machine controller 6 is connected to the AC conversion module 1 through the AC module controller 7 via the communication network, and is connected to the power battery 3 through the battery management system 8.

[0052] The whole machine controller 6 serves as the main controller of the excavator. It can send instructions to the power distribution module 4 to allocate appropriate voltage power according to the needs of the power-consuming equipment, and can send instructions to the on-board power supply, i.e., the on-board charger 2, to charge the power battery 3 according to the charging needs of the power storage battery 3. At the same time, the whole machine controller 6 can control the rectified voltage power of the AC conversion module 1 through the AC module controller 7 according to the power demand of the power-consuming equipment. In addition, the whole machine controller 6 can also monitor the status of the power storage battery 3 through the battery management system 8 and make corresponding instructions in time. In short, the setting of the communication network makes the excavator power supply system intelligent and automated, and can efficiently obtain the status and needs of each component, and issue instructions in time through the whole machine controller 6 to complete the corresponding operation.

[0053] The whole machine controller 6 is connected to a meter 9 via a communication network, and the meter 9 is used to set the on / off status of the AC conversion module 1, the power storage battery 3 and the power distribution module 4 in the working state.

[0054] The instrument 9 may include two modes for selection, namely, automatic mode and pure electric mode. The user can select the power supply mode through the instrument 9. The instrument 9 transmits the signal to the whole machine controller 6, and the whole machine controller 6 issues instructions to perform power supply operations in the corresponding mode.

[0055] Among them, the automatic mode is that the whole machine controller 6 obtains a signal to determine whether there is an external AC power supply connected. If so, the AC conversion module 1 is used to connect the external AC power supply, and then the power distribution module 4 is used to power the power-consuming equipment. In this process, the whole machine controller 6 can obtain the power status of the power storage battery 3 to determine whether to issue an instruction to charge the power storage battery 3 through the vehicle power supply using the external AC power supply. If there is no external AC power supply connected, the whole machine controller 6 issues an instruction to enable the power storage battery 3 to power the power-consuming equipment through the power distribution module 4.

[0056] In the pure electric mode, the whole machine controller 6 issues a command to enable the power battery 3 to supply power to the power-consuming equipment through the power distribution module 4. In this process, if an external AC power source is connected, the external AC power source can be used to charge the power battery 3 through the vehicle power supply to improve the endurance of the power battery 3, and the power battery 3 does not need a large capacity, which greatly reduces the cost.

[0057] It is worth noting that see Figure 4 The default power supply mode of the excavator is automatic mode. If you need to switch to pure electric mode, you need to switch it before starting the excavator to avoid affecting the normal use of the excavator.

[0058] Example 2

[0059] See also Figure 5 and Figure 6 Based on the power supply system of embodiment 1, this embodiment provides a control method of the power supply system, comprising the following steps:

[0060] S1. The whole machine controller 6 obtains the AC input voltage to determine whether there is an external AC power supply connected. If so, the whole machine controller 6 controls the AC conversion module 1 to connect the external AC power supply to convert it into a DC power supply, and outputs a suitable power supply to power the power-consuming equipment through the power distribution module 4; if not, the whole machine controller 6 controls the power storage battery 3 to output a suitable power supply to power the power-consuming equipment through the power distribution module 4;

[0061] Alternatively, S2, the user sets the power storage battery 3 as the power source on the instrument 9 to transmit the signal to the whole machine controller 6, and the whole machine controller 6 controls the power storage battery 3 to output a suitable power source through the power distribution module 4 to power the electrical equipment.

[0062] In S1, when an external AC power source is connected, the whole machine controller 6 obtains the remaining power of the power battery 3. When the remaining power of the power battery 3 is low, the whole machine controller 6 controls the vehicle power supply to connect to the external AC power source to charge the power battery 3 to a capacity not exceeding the maximum capacity of the power battery 3.

[0063] In S2 , the whole machine controller 6 obtains the AC input voltage to determine whether an external AC power source is connected. If so, the whole machine controller 6 controls the vehicle power supply to connect to the external AC power source to charge the power battery 3 to a capacity not exceeding the maximum capacity of the power battery 3 .

[0064] Based on this, the control principle of the power supply system of this embodiment is described in detail below.

[0065] S1. The default power supply mode of the excavator is the automatic mode. In the automatic mode, before the excavator is started, the whole machine controller 6 is used to obtain the current AC input voltage to determine whether there is an external AC power input.

[0066] S11, if there is external AC power input, relay K2 is turned on, relay K1 is turned off, AC conversion module 1 converts the connected external AC power into DC power after rectification, and converts the voltage through the DC converter to transmit it to power distribution module 4, and then uses power distribution module 4 to distribute appropriate voltage power to the power-consuming equipment. It is generally used in scenarios with external AC power and excavators that need to work continuously for a long time to improve the endurance of the power supply system.

[0067] During this process, the whole machine controller 6 obtains the current power (SOC) of the power battery 3. If the SOC is lower than the minimum power SOC1 of the power battery 3 set by the system, such as 50% of the maximum capacity, the whole machine controller 6 issues an instruction to connect the on-board charger 2 to the external AC power supply to convert it into a DC power supply, and performs voltage conversion through the DC converter to charge the power battery 3 until the SOC of the power battery 3 is not lower than the maximum power SOC2 of the power battery 3 set by the system, such as 95% of the maximum capacity.

[0068] In this case, the charging process of the power storage battery 3 and the process of the external AC power supply supplying power to the power equipment through the AC conversion module 1 and the power distribution module 4 do not interfere with each other, and have no effect on the charging efficiency of the power storage battery 3 and the efficiency of supplying power to the power equipment, and both can be performed efficiently. In this way, as long as there is an external AC power supply, the power storage battery 3 can be charged at any time to ensure that the power storage battery 3 has sufficient power, thereby improving the endurance when the power storage battery 3 is used for power supply. At the same time, the power storage battery 3 does not need to be large in capacity, which can greatly reduce costs.

[0069] S12, if there is no external AC power input, relay K1 is turned on, relay K2 is turned off, the power of the power storage battery 3 is converted into voltage by the DC converter and transmitted to the power distribution module 4, and then the power distribution module 4 is used to distribute the appropriate voltage power to the electrical equipment. It is generally used in the case of site transfer of the excavator to avoid the difficulty of dragging the cable on and off the trailer, and improve the convenience of site transfer of the excavator.

[0070] S2. Before starting the excavator, the user uses the instrument 9 to switch the power supply mode to the pure electric mode. The whole machine controller 6 controls the relay K1 to be turned on and the relay K2 to be turned off. The power supply of the power battery 3 is converted into voltage through the DC converter and transmitted to the power distribution module 4, and then the power distribution module 4 is used to distribute the appropriate voltage power to the electrical equipment.

[0071] During this process, the whole machine controller 6 obtains the current AC input voltage to determine whether there is an external AC power input. If so, the whole machine controller 6 issues a command to connect the on-board charger 2 to the external AC power supply to convert it into a DC power supply, and converts the voltage through the DC converter to charge the power battery 3. At this time, the power battery 3 is charging itself with the external AC power supply while supplying power to the electrical equipment to ensure that the power of the power battery 3 decreases slowly or does not decrease, so as to improve the endurance. It is generally applicable to the situation where the AC conversion module 1 fails and the excavator needs to continue to operate for a long time. Since the power battery 3 can be charged during the power supply process, the power battery 3 does not need to use a large capacity, which can reduce costs.

[0072] If not, the whole machine controller 6 only controls the power storage battery 3 as a power source to supply power to the electrical equipment. Generally, it is applicable to the emergency use or site transfer of the excavator, which improves the convenience of using the excavator.

[0073] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above-mentioned implementation mode, but also include technical schemes composed of any combination of the above-mentioned technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

Claims

1. A power supply system, characterized in that: include: An AC conversion module, an on-board power supply, a power storage battery, a power distribution module and an electric device, wherein the power distribution module is connected to the electric device to output an applicable power supply to power the electric device; The AC conversion module is connected to an external AC power supply to convert it into a DC power supply, the on-board power supply is connected to the external AC power supply and connected to the power storage battery to convert the external AC power supply into a suitable power supply for charging the power storage battery, and the AC conversion module is arranged in parallel with the on-board power supply and the power storage battery; The AC conversion module and the power storage battery are both connected to the power distribution module. In a working state, one of the AC conversion module and the power storage battery is connected to the power distribution module.

2. The power supply system according to claim 1, characterized in that: The on-board power supply includes an on-board charger and a DC converter that are connected and arranged, the on-board charger is connected to an external AC power supply to convert it into a DC power supply, and the DC converter is connected to the power battery to convert the DC power supply into a suitable power supply for charging the power battery.

3. The power supply system according to claim 1 or 2, characterized in that: The AC conversion module and the power storage battery are both connected to the power distribution module via a DC converter.

4. The power supply system according to claim 1 or 2, characterized in that: Relays are provided on the circuit between the AC conversion module and the power storage battery and the power distribution module. In a working state, the on-off states of the two relays are opposite.

5. The power supply system according to claim 1, characterized in that: The vehicle-mounted power supply and the AC conversion module are connected in parallel to an AC junction box, and the AC junction box is connected to an external AC power supply.

6. The power supply system according to claim 1 or 5, characterized in that: A leakage protection device is provided between the vehicle-mounted power supply and the AC conversion module and the external AC power supply.

7. The power supply system according to claim 1, characterized in that: The power distribution module and the vehicle power supply are connected to the whole machine controller through a communication network. The whole machine controller is connected to the AC conversion module through an AC module controller via the communication network, and is connected to the power battery through a battery management system.

8. The power supply system according to claim 7, characterized in that: The whole machine controller is connected to an instrument via a communication network, and the instrument is used to set the on / off state of the AC conversion module, the power battery and the power distribution module in a working state.

9. A control method for a power supply system, characterized in that: The following steps are involved: S1. The whole machine controller obtains the AC input voltage to determine whether there is an external AC power supply connected. If so, the whole machine controller controls the AC conversion module to connect the external AC power supply to convert it into DC power, and outputs the applicable power supply to the power-consuming equipment through the power distribution module; if not, the whole machine controller controls the power storage battery to output the applicable power supply to the power-consuming equipment through the power distribution module; Alternatively, S2, the user sets the power storage battery as the power source in the instrument to transmit the signal to the whole machine controller, and the whole machine controller controls the power storage battery to output the applicable power to the power-consuming equipment through the power distribution module.

10. The control method of the power supply system according to claim 9, characterized in that: In S1, when an external AC power source is connected, the whole machine controller obtains the remaining power of the power battery. When the remaining power of the power battery is low, the whole machine controller controls the vehicle power supply to connect to the external AC power source to charge the power battery to a capacity not exceeding the maximum capacity of the power battery.

11. The control method of the power supply system according to claim 9, characterized in that: In S2, the whole machine controller obtains the AC input voltage to determine whether an external AC power source is connected. If so, the whole machine controller controls the vehicle power supply to connect to the external AC power source to charge the power battery to a capacity not exceeding the maximum capacity of the power battery.

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