Low-speed electric vehicle and power supply control system

Abstract

The utility model discloses a low-speed electric vehicle and a power supply control system. The low-speed electric vehicle comprises a low-voltage load assembly and the power supply control system. The power supply control system comprises a power battery pack and a direct-current high-voltage-low-voltage conversion circuit. The power battery pack serves as a high voltage source and is used for outputting high voltage. The direct-current high voltage-low voltage conversion circuit serves as a low-voltage voltage source and is used for converting high voltage output by the power battery pack into low voltage and directly supplying power to the low-voltage load assembly. The DC high voltage-low voltage conversion circuit comprises a main DC / DC converter and an auxiliary DC / DC converter which work alternately. At any moment, only one of the auxiliary DC / DC converter and the main DC / DC converter is powered on to work, the direct-current high-voltage-low-voltage conversion circuit is arranged to serve as a low-voltage voltage source to replace a low-voltage battery in the low-speed electric vehicle, and the problem that the low-speed electric vehicle cannot be normally started after long-term deep dormancy can be avoided.

Description

Technical Field

[0001] This application relates to the technical field of low-speed electric vehicles, and particularly to a low-speed electric vehicle and a power supply control system. Background Art

[0002] The driving speed of a low-speed electric vehicle is usually less than or equal to 70 kilometers per hour, and the running distance is relatively short. Low-speed electric vehicles can be electric golf carts, electric lawn mowers, electric floor scrubbers, electric bicycles, electric shuttle buses, electric patrol cars, electric tricycles, electric tourist sightseeing vehicles, electric elderly scooters, electric beach vehicles, etc., and are not limited thereto. Compared with fuel vehicles, low-speed electric vehicles have the advantages of low noise, high efficiency, low cost, and more environmental protection and energy saving.

[0003] The power supply circuit of a low-speed electric vehicle usually includes a high-voltage battery and a low-voltage battery. Among them, the high-voltage battery is the power source of the low-speed electric vehicle and is used to supply power to the high-voltage system. The low-voltage battery is used to supply power to the low-voltage system. The low-voltage system includes several controllers for controlling the high-voltage system and the drive system, such as a power battery controller, a drive motor controller, etc. During the process of the low-speed electric vehicle being out of use, the low-voltage battery will still continuously output voltage to the low-voltage system. After the low-speed electric vehicle has been out of use for a long time, due to the static current loss in the low-voltage system, it is easy to cause the output voltage of the low-voltage battery to be lower than the working voltage of the controller, thereby making the controller unable to work properly and causing the low-speed electric vehicle to be unable to start normally. Summary of the Utility Model

[0004] The main purpose of this application is to provide a low-speed electric vehicle and a power supply control system, aiming to solve the problem that the low-speed electric vehicle cannot start normally after being parked for a long time in the prior art.

[0005] A low-speed electric vehicle includes:

[0006] A low-voltage load component for receiving a low-voltage and powering on to work; and

[0007] A power supply control system including a power battery pack and a DC high-voltage to low-voltage conversion circuit; the power battery pack is used as a high-voltage power source to output a high-voltage; the DC high-voltage to low-voltage conversion circuit is used as a low-voltage power source to convert the high-voltage output by the power battery pack into a low-voltage and directly supply power to the low-voltage load component; the DC high-voltage to low-voltage conversion circuit includes a main DC / DC converter and an auxiliary DC / DC converter, and the two work alternately; at any moment, only one of the auxiliary DC / DC converter and the main DC / DC converter is powered on to work.

[0008] In an embodiment of the present application, a battery controller is provided in the power battery pack; the battery controller is used to receive the low-voltage voltage output by the main DC / DC converter or the auxiliary DC / DC converter and power on to work.

[0009] In an embodiment of the present application, when the low-speed electric vehicle is in the deep sleep mode, the auxiliary DC / DC converter powers on to work; when the low-speed electric vehicle is in the non-deep sleep mode, the main DC / DC converter powers on to work.

[0010] In an embodiment of the present application, the low-voltage load component includes a vehicle controller; the vehicle controller receives the low-voltage voltage output by the DC high-voltage - low-voltage conversion circuit and powers on to work, and is used to detect the current mode of the low-speed electric vehicle and control the main DC / DC converter and the auxiliary DC / DC converter through the communication bus according to the detection result; when the low-speed electric vehicle is in the deep sleep mode, the vehicle controller outputs an auxiliary enable signal; the auxiliary DC / DC converter powers on to work according to the auxiliary enable signal, and the main DC / DC converter stops working; when the low-speed electric vehicle is in the non-deep sleep mode, the vehicle controller outputs a main enable signal; the main DC / DC converter powers on to work according to the main enable signal, and the auxiliary DC / DC converter stops working.

[0011] In an embodiment of the present application, the vehicle controller uses the communication bus to obtain the start control signal and the message transceiver signal in the low-speed electric vehicle, and judges the current mode of the low-speed electric vehicle according to the start control signal and the message transceiver signal; when the start control signal and / or the message transceiver signal is detected, the vehicle controller identifies that the low-speed electric vehicle is in the non-deep sleep mode; when neither the start control signal nor the message transceiver signal is detected, the vehicle controller identifies that the low-speed electric vehicle is in the deep sleep mode.

[0012] In an embodiment of the present application, the output power of the main DC / DC converter is greater than the main power upper limit threshold; the output power of the auxiliary DC / DC converter is less than the auxiliary power upper limit threshold; the main power upper limit threshold is greater than the auxiliary power upper limit threshold.

[0013] A power supply control system is applied to a low-speed electric vehicle; the low-speed electric vehicle includes a low-voltage load component; the power supply control system includes:

[0014] A power battery pack, as a high-voltage voltage source, is used to output a high-voltage voltage; and

[0015] A DC high-voltage - low-voltage conversion circuit, as a low-voltage voltage source, is used to convert the high-voltage voltage output by the power battery pack into a low-voltage voltage and directly supply power to the low-voltage load component; the DC high-voltage - low-voltage conversion circuit includes a main DC / DC converter and an auxiliary DC / DC converter, and the two work alternately; at any moment, only one of the auxiliary DC / DC converter and the main DC / DC converter is powered on to work.

[0016] In an embodiment of the present application, a battery controller is provided in the power battery pack; the battery controller is configured to receive the low-voltage output by the DC high-voltage to low-voltage conversion circuit and power on for operation.

[0017] In an embodiment of the present application, the low-voltage load assembly includes a vehicle controller; when the DC high-voltage to low-voltage conversion circuit receives the auxiliary enable signal output by the vehicle controller through the communication bus, the auxiliary DC / DC converter is powered on for operation, and the main DC / DC converter stops working; when the DC high-voltage to low-voltage conversion circuit receives the main enable signal output by the vehicle controller through the communication bus, the main DC / DC converter is powered on for operation, and the auxiliary DC / DC converter stops working.

[0018] In an embodiment of the present application, the output power of the main DC / DC converter is greater than the main power upper limit threshold; the output power of the auxiliary DC / DC converter is less than the auxiliary power upper limit threshold; the main power upper limit threshold is greater than the auxiliary power upper limit threshold.

[0019] For the above-mentioned low-speed electric vehicle and the power supply control system, by providing the DC high-voltage to low-voltage conversion circuit as the low-voltage power source to replace the low-voltage battery in the prior art, the overall weight of the low-speed electric vehicle can be reduced, the available space inside the low-speed electric vehicle can be increased, and the cost of the low-speed electric vehicle can also be reduced. At the same time, the main DC / DC converter and the auxiliary DC / DC converter in the DC high-voltage to low-voltage conversion circuit work alternately, reducing the continuous working time of the main DC / DC converter and the auxiliary DC / DC converter. In addition, the DC high-voltage to low-voltage conversion circuit uses the power battery pack as the voltage source, which can extend the power supply time length of the low-voltage power source in the low-speed electric vehicle. Furthermore, when in the long-term deep sleep mode, the power supply inside the power battery pack is used for power supply, which can extend the deep sleep time of the low-speed electric vehicle and avoid the problem that the low-speed electric vehicle cannot start normally after long-term deep sleep. Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0021] Figure 1 It is a three-dimensional schematic diagram of a low-speed electric vehicle in a preferred embodiment of the present application.

[0022] Figure 2 For Figure 1 The module schematic diagram of the medium and low-speed electric vehicle.

[0023] Description of Main Component Symbols

[0024] Low-speed electric vehicle 100

[0025] Vehicle body 10

[0026] Frame 11

[0027] Body covering structure 12

[0028] Traveling assembly 20

[0029] Wheel 21

[0030] Power control system 30

[0031] Low-voltage wire 301

[0032] High-voltage wire 302

[0033] Communication bus 303

[0034] Power battery pack 31

[0035] Battery controller 311

[0036] DC high-voltage to low-voltage conversion circuit 32

[0037] Main DC / DC converter 321

[0038] Auxiliary DC / DC converter 322

[0039] Low-voltage load assembly 40

[0040] Vehicle controller 41

[0041] Motor controller 42

[0042] Instrument panel 43

[0043] High-voltage load assembly 50

[0044] Drive motor 51

[0045] Air conditioner 52

[0046] The following specific embodiments will further illustrate the present application in conjunction with the above-mentioned drawings. Specific Embodiments

[0047] To enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this application.

[0048] It should be noted that "at least one" in this application means one or more, and "a plurality" means two or more than two. "And / or" describes the association relationship of associated objects and indicates that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B may be singular or plural. The terms "first", "second", "third", "fourth", etc. (if any) in the description, claims, and drawings of this application are used to distinguish similar objects, rather than to describe a specific order or sequence.

[0049] In the embodiments of this application, words such as "exemplary" or "for example" are used to represent examples, illustrations, or explanations. Any embodiment or design solution described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or having more advantages than other embodiments or design solutions. Rather, the use of words such as "exemplary" or "for example" is intended to present relevant concepts in a specific manner. Without conflict, the following embodiments and the features in the embodiments may be combined with each other.

[0050] The following takes the length direction of the low-speed electric vehicle as the front-rear direction, the width direction of the low-speed electric vehicle as the left-right direction, and the height direction of the low-speed electric vehicle as the up-down direction. To clearly illustrate the technical solution of this application, the front, rear, left, right, up, and down are also defined in Figure 1 this application.

[0051] The following describes the specific implementation manners of the low-speed electric vehicle and the power supply control system of this application with reference to the accompanying drawings.

[0052] Please refer to Figures 1 to 2 , Figure 1 which is a three-dimensional schematic diagram of a low-speed electric vehicle 100 provided by an embodiment of this application, Figure 2It is a schematic diagram of the modules of the low-speed electric vehicle 100. Specifically, the driving speed of the low-speed electric vehicle 100 is lower than 70 kilometers per hour. In at least one embodiment of the present application, the low-speed electric vehicle 100 can be an electric golf cart, an electric lawn mower, an electric floor washer, an electric bicycle, an electric shuttle bus, an electric patrol vehicle, an electric tricycle, an electric tourist sightseeing vehicle, an electric elderly mobility scooter, an electric beach vehicle, etc., but is not limited thereto. In at least one embodiment of the present application, the low-speed electric vehicle 100 can switch between a deep sleep mode and a non-deep sleep mode. Among them, the non-deep sleep mode can be further divided into a start mode and a standby mode. In other embodiments, the non-deep sleep mode can also be divided into more modes according to requirements, such as a light sleep mode, an initial mode, etc., but is not limited thereto.

[0053] The low-speed electric vehicle 100 includes a vehicle body 10, a traveling assembly 20, a power control system 30 (as Figure 2 shown), a low-voltage load assembly 40 (as Figure 2 shown), and a high-voltage load assembly 50 (as Figure 2 shown).

[0054] The vehicle body 10 includes a vehicle frame 11 and a body covering structure 12. The body covering structure 12 is at least partially disposed on the vehicle frame 11 and fixedly connected to the vehicle frame 11.

[0055] The traveling assembly 20 includes four wheels 21. Among them, two wheels 21 are rotatably disposed at the front end of the vehicle frame 11, and the other two wheels 21 are rotatably disposed at the rear end of the vehicle frame 11. The four wheels 21 are at least partially located below the vehicle frame 11 to support the vehicle frame 11.

[0056] The power control system 30 serves as the power source of the low-speed electric vehicle 100, and is used to output a low-voltage voltage to the low-voltage load assembly 40 through the low-voltage line 301, and output a high-voltage voltage to the high-voltage load assembly 50 through the high-voltage line 302. Among them, the high-voltage voltage is greater than the low-voltage voltage. In at least one embodiment of the present application, the high-voltage voltage can be 48 volts (V), and the low-voltage voltage can be 12V. The power control system 30 includes a power battery pack 31 and a DC high-voltage to low-voltage conversion circuit 32. Among them, the power battery pack 31 is used to output a high-voltage voltage to the high-voltage line 302, and the DC high-voltage to low-voltage conversion circuit 32 receives the high-voltage voltage through the high-voltage line 302 and converts the high-voltage voltage into a low-voltage voltage for output to the low-voltage line 301.

[0057] The power battery pack 31 serves as a high-voltage power source and is used to output high-voltage power to the high-voltage line 302. The power battery pack 31 may include multiple groups of battery cells (not shown in the figure) and a battery controller 311 (Battery Management Controller, BMC). The battery controller 311 is used to manage and protect the battery cells in the power battery pack 31. The battery controller 311 is powered on by receiving the low-voltage power output by the DC high-voltage to low-voltage conversion circuit 32 through the low-voltage line 301. The battery controller 311 can further communicate with the vehicle controller 41 in the low-voltage load assembly 40 through the communication bus 303 to feedback the relevant parameters of the power battery pack 31 to the vehicle controller 41. In at least one embodiment of the present application, the relevant parameters may include battery power, temperature, state of charge, battery health state, etc., but are not limited thereto. In at least one real-time mode of the present application, the rated voltage of the power battery pack 31 is 48V.

[0058] The DC high-voltage to low-voltage conversion circuit 32 serves as a low-voltage power source and is used to receive high-voltage power through the high-voltage line 302 and convert the high-voltage power into low-voltage power for output to the low-voltage line 301. The DC high-voltage to low-voltage conversion circuit 32 can also communicate with the vehicle controller 41 in the low-voltage load assembly 40 through the communication bus 303. When receiving the auxiliary enable signal output by the vehicle controller 41, the DC high-voltage to low-voltage conversion circuit 32 switches to the auxiliary working mode. At this time, the output power of the DC high-voltage to low-voltage conversion circuit 32 is less than the auxiliary power upper limit threshold; when receiving the main enable signal output by the vehicle controller 41, the DC high-voltage to low-voltage conversion circuit 32 switches to the main working mode. At this time, the output power of the DC high-voltage to low-voltage conversion circuit 32 is greater than the main power upper limit threshold. Among them, the auxiliary power upper limit threshold is less than the main power upper limit threshold. The auxiliary power upper limit threshold is used to limit the maximum output power of the DC high-voltage to low-voltage conversion circuit 32 in the auxiliary working mode, and the main power lower limit threshold is used to limit the minimum output power of the DC high-voltage to low-voltage conversion circuit 32 in the main working mode. Specifically, the auxiliary enable signal is used to indicate that the low-speed electric vehicle 100 is in the deep sleep mode, and only the static loss current exists in the low-voltage load assembly 40, and the output power of the DC high-voltage to low-voltage conversion circuit 32 is relatively low; the main enable signal is used to indicate that the low-speed electric vehicle 100 is in the non-deep sleep mode, and there is a working current in the low-voltage load assembly 40. Since the working current is greater than the static loss current, the output power of the DC high-voltage to low-voltage conversion circuit 32 is relatively high. In at least one embodiment of the present application, in at least one embodiment of the present application, the auxiliary power upper limit threshold is 10 milliamperes (mA), and the main power upper limit threshold is 100 milliamperes (mA). In other embodiments, the values of the auxiliary power upper limit threshold and the main power upper limit threshold can be adjusted according to requirements.

[0059] The DC high-voltage to low-voltage conversion circuit 32 includes a main DC / DC converter 321 and an auxiliary DC / DC converter 322. At any moment, only one of the main DC / DC converter 321 and the auxiliary DC / DC converter 322 is in the working state.

[0060] The main DC / DC converter 321 is electrically connected to the power battery pack 31 through the high-voltage line 302 and communicates with the vehicle controller 41 in the low-voltage load assembly 40 through the communication bus 303. The main DC / DC converter 321 powers on and works according to the high-voltage when receiving the main enable signal output by the vehicle controller 41, and stops working when not receiving the main enable signal. Specifically, when powering on and working, the main DC / DC converter 321 converts the high-voltage into a low-voltage and provides the low-voltage to the low-voltage load assembly 40 and the battery controller 311 through the low-voltage line 301. When powering on and working, the output power of the main DC / DC converter 321 is greater than the main power upper limit threshold. That is, the main power upper limit threshold is used to limit the minimum output power of the main DC / DC converter 321 when powering on and working.

[0061] The auxiliary DC / DC converter 322 is electrically connected to the power battery pack 31 through the high-voltage line 302 and communicates with the vehicle controller 41 in the low-voltage load assembly 40 through the communication bus 303. The auxiliary DC / DC converter 322 powers on and works according to the high-voltage when receiving the auxiliary enable signal output by the vehicle controller 41, and stops working when not receiving the auxiliary enable signal. Specifically, when powering on and working, the auxiliary DC / DC converter 322 converts the high-voltage into a low-voltage and provides the low-voltage to the low-voltage load assembly 40 and the battery controller 311 through the low-voltage line 301. When powering on and working, the output power of the auxiliary DC / DC converter 322 is less than the auxiliary power upper limit threshold. That is, the auxiliary power upper limit threshold is used to limit the maximum output power of the auxiliary DC / DC converter 322 when powering on and working.

[0062] The low-voltage load component 40 receives the low-voltage on the low-voltage line 301 and powers on to work. In at least one embodiment of the present application, the low-voltage load component 40 may include a vehicle controller 41, a motor controller 42, an instrument panel 43, etc., but is not limited thereto. Among them, the vehicle controller 41 communicates with the motor controller 42, the instrument panel 43, the battery controller 311, and the DC high-voltage to low-voltage conversion circuit 32 through the communication bus 303. The vehicle controller 41 is used to detect the current mode of the low-speed electric vehicle 100 in real time. When it detects that the low-speed electric vehicle 100 is in the deep sleep mode, the vehicle controller 41 outputs an auxiliary enable signal to the auxiliary DC / DC converter 322. When it detects that the low-speed electric vehicle 100 is in the non-sleep mode, it outputs a main enable signal to the main DC / DC converter 321. Specifically, the vehicle controller 41 can use the communication bus 303 to obtain the start control signal and the message transceiver signal, and identify the current mode of the low-speed electric vehicle 100 according to the acquisition situation of the start control signal and the message transceiver signal. When it detects the start control signal and / or the message transceiver signal, the vehicle controller 41 identifies that the low-speed electric vehicle 100 is in the non-deep sleep mode. That is, a start control signal is generated when the low-speed electric vehicle 100 is in the start mode. In at least one embodiment of the present application, the start control signal can be generated by pressing the start button, turning the switch, and remote sending, etc.; the message transceiver signal can be generated by devices such as the battery controller 311, the motor controller 42, and the instrument panel 43; the message transceiver signal refers to. When the start control signal and the message transceiver signal are not detected, the vehicle controller 41 identifies that the low-speed electric vehicle 100 is in the deep sleep mode. The motor controller 42 receives the low-voltage on the low-voltage line 301 and powers on to work, and communicates with the drive motor 51 in the high-voltage load component 50 through the communication bus 303 to control the drive motor 51. The motor controller 42 can further communicate with the vehicle controller 41 through the communication bus 303. The instrument panel 43 receives the low-voltage on the low-voltage line 301 and powers on to work, and is used to obtain the relevant parameters of the power system and display them to the user. The instrument panel 43 can further communicate with the vehicle controller 41 through the communication bus 303.

[0063] The high-voltage load component 50 receives the high-voltage on the high-voltage line 302 and powers on to work. In at least one embodiment of the present application, the high-voltage load component 50 may include a drive motor 51, an air conditioner 52, etc., but is not limited thereto. The drive motor 51 can rotate under the control of the motor controller 42. As a power component, the output shaft of the drive motor 51 is connected to the wheel 21 through a transmission structure (not shown in the figure) to drive the wheel 21 to rotate.

[0064] The above-mentioned low-speed electric vehicle 100 and the power supply control system 30, by setting the DC high-voltage to low-voltage conversion circuit 32 as the low-voltage power source to replace the low-voltage battery in the prior art, can reduce the overall weight of the low-speed electric vehicle 100, increase the available space inside the low-speed electric vehicle 100, and also reduce the cost of the low-speed electric vehicle 100. At the same time, the main DC / DC converter 321 and the auxiliary DC / DC converter 322 in the DC high-voltage to low-voltage conversion circuit 32 work alternately, reducing the continuous working time of the main DC / DC converter 321 and the auxiliary DC / DC converter 322. In addition, the DC high-voltage to low-voltage conversion circuit uses the power battery pack 31 as the power source, which can extend the power supply time length of the low-voltage power source in the low-speed electric vehicle 100. Furthermore, when in the long-term deep sleep mode, the power source in the power battery pack 31 is used for power supply, which can extend the deep sleep time of the low-speed electric vehicle 100 and avoid the problem that the low-speed electric vehicle 100 cannot be started normally after a long-term deep sleep.

[0065] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. And these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A low-speed electric vehicle, comprising: A low-voltage load component, configured to receive a low-voltage and power on for operation; And A power control system, including a power battery pack and a DC high-voltage to low-voltage conversion circuit; The power battery pack serves as a high-voltage source for outputting a high voltage; the DC high-voltage to low-voltage conversion circuit serves as a low-voltage source for converting the high voltage output by the power battery pack into the low voltage and directly supplying power to the low-voltage load component; characterized in that: the DC high-voltage to low-voltage conversion circuit includes a main DC / DC converter and an auxiliary DC / DC converter, and the two work alternately; at any moment, only one of the auxiliary DC / DC converter and the main DC / DC converter is powered on for operation.

2. The low-speed electric vehicle according to claim 1, wherein, A battery controller is provided in the power battery pack; the battery controller directly receives the low voltage output by the main DC / DC converter or the auxiliary DC / DC converter and powers on for operation.

3. The low-speed electric vehicle according to claim 1, characterized in that When the low-speed electric vehicle is in the deep sleep mode, the auxiliary DC / DC converter powers on for operation; when the low-speed electric vehicle is in the non-deep sleep mode, the main DC / DC converter powers on for operation.

4. The low-speed electric vehicle according to claim 3, wherein The low-voltage load component includes a vehicle controller; the vehicle controller receives the low voltage output by the DC high-voltage to low-voltage conversion circuit and powers on for operation, and is configured to detect the current mode of the low-speed electric vehicle and control the main DC / DC converter and the auxiliary DC / DC converter through a communication bus according to the detection result; When the low-speed electric vehicle is in the deep sleep mode, the vehicle controller outputs an auxiliary enable signal; the auxiliary DC / DC converter powers on for operation according to the auxiliary enable signal, and the main DC / DC converter stops working; when the low-speed electric vehicle is in the non-deep sleep mode, the vehicle controller outputs a main enable signal; the main DC / DC converter powers on for operation according to the main enable signal, and the auxiliary DC / DC converter stops working.

5. The low-speed electric vehicle according to claim 4, characterized in that, The vehicle controller uses the communication bus to obtain the start control signal and the message transceiver signal in the low-speed electric vehicle, and judges the current mode of the low-speed electric vehicle according to the start control signal and the message transceiver signal; when detecting the start control signal and / or the message transceiver signal, the vehicle controller identifies that the low-speed electric vehicle is in the non-deep sleep mode; when not detecting the start control signal and the message transceiver signal, the vehicle controller identifies that the low-speed electric vehicle is in the deep sleep mode.

6. The low-speed electric vehicle according to claim 4, characterized in that, The output power of the main DC / DC converter is greater than the main power upper limit threshold; the output power of the auxiliary DC / DC converter is less than the auxiliary power upper limit threshold; The main power upper limit threshold is greater than the auxiliary power upper limit threshold.

7. A power control system is applied to a low-speed electric vehicle; the low-speed electric vehicle includes a low-voltage load component; characterized in that: The power control system includes: A power battery pack, serving as a high-voltage source for outputting a high voltage; and The DC high-voltage to low-voltage conversion circuit, as a low-voltage voltage source, is used to convert the high-voltage output from the power battery pack into a low-voltage and directly supply power to the low-voltage load assembly; characterized in that: the DC high-voltage to low-voltage conversion circuit includes a main DC / DC converter and an auxiliary DC / DC converter, and the two work alternately; at any moment, only one of the auxiliary DC / DC converter and the main DC / DC converter is powered on and working.

8. The power control system according to claim 7, wherein A battery controller is provided in the power battery pack; the battery controller directly receives the low-voltage output from the DC high-voltage to low-voltage conversion circuit and is powered on to work.

9. The power supply control system according to claim 7, wherein The low-voltage load assembly includes a vehicle controller; when the DC high-voltage to low-voltage conversion circuit receives the auxiliary enable signal output by the vehicle controller through the communication bus, the auxiliary DC / DC converter is powered on to work, and the main DC / DC converter stops working; when the DC high-voltage to low-voltage conversion circuit receives the main enable signal output by the vehicle controller through the communication bus, the main DC / DC converter is powered on to work, and the auxiliary DC / DC converter stops working.

10. The power control system according to claim 7, wherein The output power of the main DC / DC converter is greater than the main power upper limit threshold; the output power of the auxiliary DC / DC converter is less than the auxiliary power upper limit threshold; the main power upper limit threshold is greater than the auxiliary power upper limit threshold.

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