Low-voltage power-on system for vehicle and vehicle

Abstract

The utility model provides a low-voltage power-on system for a vehicle and the vehicle, and relates to the technical field of vehicle power-on, the low-voltage power-on system comprises a battery pack comprising a low-voltage battery and a high-voltage battery; the first connecting end of the voltage conversion device is connected with the high-voltage battery, the voltage conversion device comprises a transformer module, and the transformer module is electrically connected with the high-voltage battery; a second connecting end of the voltage conversion device is connected with the low-voltage power supply chip through the low-voltage relay, a third connecting end of the voltage conversion device is connected with the low-voltage relay through the ignition switch, and one end of the low-voltage battery is connected with the voltage conversion device; the other end of the low-voltage battery is connected with the low-voltage power supply chip through the low-voltage relay; the low-voltage battery is connected with the ignition switch in parallel; when the working state of the low-voltage battery is abnormal and the ignition switch is powered on, the voltage conversion device converts high-voltage current output by the high-voltage battery into low-voltage current to supply power to the low-voltage power supply chip.

Description

Technical Field

[0001] This application relates to the field of automotive power supply technology, and more specifically, to a low-voltage power supply system for vehicles and a vehicle. Background Technology

[0002] As one of the most promising types of vehicles currently, pure electric vehicles have attracted worldwide attention in the automotive industry. They use a high-voltage battery as their power source, and in addition, a low-voltage battery powers the vehicle's control systems. If the battery connection is suddenly lost during driving, it poses a significant threat to driving safety.

[0003] Due to the connector locking structure and driver usage habits, low-voltage batteries are more prone to sudden dislodgement during vehicle operation due to connector aging and wear, or vehicle bumps, compared to high-voltage batteries. This can lead to a sudden power outage of the vehicle's internal chips and loss of vehicle control. Therefore, a safe and reliable backup power source is of paramount importance.

[0004] There is currently no effective solution to the above problems. Utility Model Content

[0005] The main objective of this application is to provide a low-voltage power supply system and vehicle for use in vehicles, in order to solve the problem of low-voltage system failure caused by sudden disconnection of the low-voltage battery during driving, which in turn leads to loss of vehicle control.

[0006] To achieve the above objectives, according to one aspect of this application, a low-voltage power supply system for a vehicle and a vehicle are provided.

[0007] Furthermore, the low-voltage power supply system for the vehicle includes: a battery pack comprising a low-voltage battery and a high-voltage battery; a voltage conversion device, the first connection terminal of which is connected to the high-voltage battery, the voltage conversion device including a transformer module electrically connected to the high-voltage battery; and a low-voltage power chip, the second connection terminal of which is connected to the low-voltage power chip via a low-voltage relay, the third connection terminal of which is connected to the low-voltage relay via an ignition switch, one end of the low-voltage battery being connected to the voltage conversion device, the other end of which is connected to the low-voltage power chip via a low-voltage relay, and the low-voltage battery being connected in parallel with the ignition switch; wherein, when the low-voltage battery is in an abnormal operating state and the ignition switch is powered on, the voltage conversion device converts the high-voltage current output by the high-voltage battery into a low-voltage current to power the low-voltage power chip.

[0008] Furthermore, the voltage conversion device includes: a switching transistor module, one end of which is electrically connected to the transformer module; a control module, one end of which is electrically connected to the other end of the switching transistor module, a second end of which is electrically connected to at least one of the transformer module and the high-voltage battery, a third end of which is electrically connected to a low-voltage relay via a low-voltage battery, and a fourth end of which is electrically connected to the low-voltage relay via an ignition switch; and a rectifier module, one end of which is electrically connected to the transformer module, and the other end of which is connected to a path connecting the low-voltage battery and the low-voltage relay.

[0009] Furthermore, the transformer module includes: a transformer main coil, the first end of which is electrically connected to the high-voltage battery, the second end of which is electrically connected to the rectifier module, and the third end of which is electrically connected to the switching transistor module; and a transformer auxiliary coil, which is configured in conjunction with the transformer main coil, and the output end of which is electrically connected to the control module.

[0010] Furthermore, the control module includes: a control chip, the first terminal of which is connected to the switching transistor module, the second terminal of which is electrically connected to at least one of the high-voltage battery, the main coil of the transformer, and the auxiliary coil of the transformer, the third terminal of which is electrically connected to the low-voltage relay via the low-voltage battery, and the fourth terminal of which is electrically connected to the low-voltage relay via the ignition switch.

[0011] Furthermore, the control module includes: an absorption circuit, the input terminal of which is electrically connected to the output terminal of the transformer main coil, and the output terminal of which is connected to the path between the high-voltage battery and the transformer main coil.

[0012] Furthermore, the control module includes: a comparator, wherein there are multiple comparators, one of which is configured to conduct the path between the low-voltage battery and the control chip, and another of which is configured to conduct the path between the ignition switch and the control chip.

[0013] Furthermore, the comparator includes: a first comparator, the positive pin of which is electrically connected to the low-voltage battery, the negative pin of which is electrically connected to the control chip, and the output of which is electrically connected to the control chip; and a second comparator, the positive pin of which is electrically connected to the ignition switch, the negative pin of which is grounded, and the output of which is electrically connected to the control chip.

[0014] Furthermore, the low-voltage power supply system includes: a first diode, the anode of which is electrically connected to the rectifier module, and the cathode of which is electrically connected to the low-voltage battery and the low-voltage relay; and a second diode, the anode of which is electrically connected to the low-voltage battery, and the cathode of which is electrically connected to the low-voltage relay.

[0015] Furthermore, the input voltage of the transformer module is 350-750V, and the output voltage of the transformer module is 12-18V.

[0016] According to another aspect of this application, a vehicle is provided, including a low-voltage power supply system for the vehicle, wherein the low-voltage power supply system for the vehicle is the aforementioned low-voltage power supply system for the vehicle.

[0017] By applying the technical solution of this application, when the low-voltage battery is in an abnormal working state and the ignition switch is powered on, the transformer module in the voltage conversion device converts the high-voltage current output by the high-voltage battery into a low-voltage current to power the low-voltage power chip, temporarily supplying low voltage to the vehicle, preventing the vehicle from losing control, solving the problem of low-voltage system failure caused by the sudden disconnection of the low-voltage battery during driving, and thus causing the vehicle to lose control, thereby ensuring driving safety. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0019] Figure 1 A schematic diagram of the structure of a first embodiment of a low-voltage power supply system for a vehicle according to this application is shown;

[0020] Figure 2 A schematic diagram of a second embodiment of a low-voltage power supply system for a vehicle according to this application is shown.

[0021] The above figures include the following reference numerals:

[0022] 1. Low-voltage battery;

[0023] 2. Low-voltage relay;

[0024] 3. Ignition switch;

[0025] 4. Low-voltage power supply chip;

[0026] 5. Voltage conversion device;

[0027] 6. High-voltage battery;

[0028] 7. Transformer main coil;

[0029] 8. Transformer auxiliary coil;

[0030] 9. Rectifier module;

[0031] 10. Control module;

[0032] 11. Switching transistor module;

[0033] 12. Absorption circuit;

[0034] 13. Control chip;

[0035] 141. First comparator; 142. Second comparator;

[0036] 151. First diode; 152. Second diode. Detailed Implementation

[0037] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0040] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0041] Combination Figures 1 to 2In a specific embodiment of this application, a low-voltage power supply system for a vehicle is provided.

[0042] Specifically, the low-voltage power supply system for the vehicle includes a battery pack, a voltage conversion device 5, and a low-voltage power chip 4. The battery pack includes a low-voltage battery 1 and a high-voltage battery 6. The first connection terminal of the voltage conversion device 5 is connected to the high-voltage battery 6. The voltage conversion device 5 includes a transformer module, which is electrically connected to the high-voltage battery 6. The second connection terminal of the voltage conversion device 5 is connected to the low-voltage power chip 4 through a low-voltage relay 2. The third connection terminal of the voltage conversion device 5 is connected to the low-voltage relay 2 through an ignition switch 3. One end of the low-voltage battery 1 is connected to the voltage conversion device 5, and the other end of the low-voltage battery 1 is connected to the low-voltage power chip 4 through the low-voltage relay 2. The low-voltage battery 1 is connected in parallel with the ignition switch 3. When the low-voltage battery 1 is in an abnormal working state and the ignition switch 3 is powered on, the voltage conversion device 5 converts the high-voltage current output by the high-voltage battery 6 into a low-voltage current to power the low-voltage power chip 4.

[0043] In a specific embodiment of this application, taking a 24V system as an example, the minimum low voltage is set to 9V, and the low position of the ignition switch is set to 2V. When the low voltage battery 1 is in an abnormal working state (the voltage output by the low voltage battery 1 is less than or equal to the set minimum low voltage), and the ignition switch 3 is powered on (the signal output by the ignition switch 3 is higher than the low position), the voltage conversion device 5 converts the high voltage current output by the high voltage battery 6 into a low voltage current to power the low voltage power chip 4, temporarily supplying low voltage to the vehicle to prevent the vehicle from losing control. This solves the problem of the low voltage system failing due to the sudden disconnection of the low voltage battery during driving, which in turn leads to the loss of vehicle control, and ensures driving safety.

[0044] Combination Figure 1 As shown in the specific embodiment of this application, the voltage conversion device 5 includes a rectifier module 9, a control module 10, and a switching transistor module 11. One end of the switching transistor module 11 is electrically connected to the transformer module. The first end of the control module 10 is electrically connected to the other end of the switching transistor module 11. The second end of the control module 10 is electrically connected to at least one of the transformer module and the high-voltage battery 6. The third end of the control module 10 is electrically connected to the low-voltage relay 2 through the low-voltage battery 1. The fourth end of the control module 10 is electrically connected to the low-voltage relay 2 through the ignition switch 3. One end of the rectifier module 9 is electrically connected to the transformer module, and the other end of the rectifier module 9 is connected to the path connecting the low-voltage battery 1 and the low-voltage relay 2.

[0045] Combination Figure 1As shown, in this embodiment, the rectifier module 9 rectifies the low-voltage electricity converted by the transformer module, and the switching module 11 is used to create an energy conversion path between the high-voltage battery and the transformer module by controlling the periodic on and off of the switching transistor. In the flyback power supply circuit, the on of the switching transistor allows energy to flow from the high-voltage battery to the main coil of the transformer, while during the off period, the energy stored in the main coil is released to the rectifier module in the form of a lower voltage. This energy conversion and regulation process can convert the high-voltage electricity from the high-voltage battery into low-voltage electricity suitable for use in the low-voltage system. The control module 10 is used to exchange information and send control commands to the transformer module, rectifier module 9, switching module 11, low-voltage battery 1, ignition switch 3, and high-voltage battery 6. This setup ensures that the vehicle's high-voltage system can continue to operate when the low-voltage system fails, thereby ensuring driving safety. Through the multi-terminal connection of the control module, precise control of the voltage conversion device can be achieved, ensuring voltage stability and preventing vehicle loss of control due to voltage fluctuations.

[0046] Furthermore, the transformer module includes a main transformer coil 7 and an auxiliary transformer coil 8. The first end of the main transformer coil 7 is electrically connected to the high-voltage battery 6, the second end of the main transformer coil 7 is electrically connected to the rectifier module 9, and the third end of the main transformer coil 7 is electrically connected to the switching transistor module 11. The auxiliary transformer coil 8 is configured in conjunction with the main transformer coil 7, and its output end is electrically connected to the control module 10. This configuration allows for precise regulation of the output voltage by accurately controlling the switching state of the switching transistor, thus preventing low-voltage system failure caused by sudden disconnection of the low-voltage battery during vehicle operation.

[0047] Furthermore, the control module 10 includes a control chip 13. The first end of the control chip 13 is connected to the switching transistor module 11. The second end of the control chip 13 is electrically connected to at least one of the high-voltage battery 6, the main coil of the transformer 7, and the auxiliary coil of the transformer 8. The third end of the control chip 13 is electrically connected to the low-voltage relay 2 through the low-voltage battery 1. The fourth end of the control chip 13 is electrically connected to the low-voltage relay 2 through the ignition switch 3.

[0048] In one embodiment of this application, when the vehicle is not malfunctioning, the driver starts the vehicle, and the ignition switch 3 transmits information to the low-voltage relay 2. The low-voltage relay 2 then closes, allowing the low-voltage battery 1 to supply power to the vehicle's low-voltage power chip 4. The control module 10 enters sleep mode after connecting the high-voltage battery 6, and wakes up upon receiving a power supply signal from the transformer auxiliary coil 8. The control module 10 then detects the signal from the ignition switch 3 and also supplies power to the low-voltage relay 2. At this time, the power sources for the low-voltage relay 2 are the ignition switch 3 and the control module 10.

[0049] In one embodiment of this application, when the vehicle is powered off, the ignition switch 3 transmits information to the low-voltage relay 2. However, the low-voltage relay 2 cannot be disconnected because it is still powered by the control module 10. At this time, the control module 10 detects that the ignition switch 3 is powered off, but the control signal will keep the low-voltage relay 2 in a closed state for a short period of time to allow the entire electrical architecture to perform information storage. After the information storage is completed, the control module 10 disconnects the low-voltage relay 2, causing the vehicle's low-voltage power chip 4 to be powered off.

[0050] When a vehicle encounters a low-voltage failure during operation, the low-voltage power chip 4 is running. Suddenly, both the low-voltage battery and ignition switch 3 fail. Since the control module 10 is powered by the auxiliary coil and is not affected by the low voltage, it remains closed. Then, when the control module 10 detects that the voltage of the low-voltage battery and ignition switch 3 is zero, it enters a fault mode. At this time, the control module 10, through the switching cycle of the control switch module 11, forms a flyback power supply with the high-voltage battery 6 and the transformer main coil. This power is then rectified by the rectifier module 9, finally converting the high-voltage electricity from the high-voltage battery 6 into low-voltage electricity, which is then supplied to the vehicle's low-voltage power chip 4 via the low-voltage relay 2. After a period of time, the switch module 11 is disconnected, thus powering off the vehicle.

[0051] When the control module 10 detects that both the low-voltage battery and ignition switch 3 are within the normal range, the vehicle is considered to be in normal condition and no fault protection will be triggered. When the control module 10 detects that the low-voltage battery voltage is within the normal range and the ignition switch 3 has a falling edge, it is considered a normal power-down process. Only when the control module 10 detects a falling edge on the ignition switch 3 and the low-voltage battery signal drops out of the normal range is it considered a low-voltage failure state and protection will be triggered.

[0052] Combination Figure 2 As shown, in one specific embodiment of this application, the control module 10 includes an absorption circuit 12. The input terminal of the absorption circuit 12 is electrically connected to the output terminal of the transformer main coil 7, and the output terminal of the absorption circuit 12 is connected to the conductive path between the high-voltage battery 6 and the transformer main coil 7. This configuration can recover excess electrical energy output from the transformer main coil 7, improving the energy utilization efficiency of the low-voltage power supply system.

[0053] Furthermore, the control module 10 includes multiple comparators. One of the comparators is configured to connect the low-voltage battery 1 and the control chip 13, while another comparator is configured to connect the ignition switch 3 and the control chip 13. This configuration enables the control module 10 to monitor the voltage of the low-voltage battery 1 and the power-on status of the ignition switch 3 in real time. Therefore, if the low-voltage battery suddenly disconnects during driving, causing a low-voltage system failure, the transformer module in the voltage conversion device 5 converts the high-voltage current output from the high-voltage battery 6 into a low-voltage current to power the low-voltage power chip 4, temporarily supplying low voltage to the vehicle, preventing vehicle loss of control, and improving driving safety.

[0054] Furthermore, the comparator includes a first comparator 141 and a second comparator 142. The positive pin of the first comparator 141 is electrically connected to the low-voltage battery 1, the negative pin of the first comparator 141 is electrically connected to the control chip 13, and the output terminal of the first comparator 141 is electrically connected to the control chip 13. The positive pin of the second comparator 142 is electrically connected to the ignition switch 3, the negative pin of the second comparator 142 is grounded, and the output terminal of the second comparator 142 is electrically connected to the control chip 13. This configuration enables the control module 10 to monitor the voltage of the low-voltage battery 1 and the power-on status of the ignition switch 3 in real time. Thus, when the low-voltage battery suddenly disconnects during driving, causing a failure of the low-voltage system, the transformer module in the voltage conversion device 5 converts the high-voltage current output from the high-voltage battery 6 into a low-voltage current to power the low-voltage power chip 4, temporarily supplying low voltage to the vehicle, preventing vehicle loss of control, and improving driving safety.

[0055] Furthermore, the low-voltage power supply system includes a first diode 151 and a second diode 152. The anode of the first diode 151 is electrically connected to the rectifier module 9, and the cathode of the first diode 151 is electrically connected to the low-voltage battery 1 and the low-voltage relay 2. The anode of the second diode 152 is electrically connected to the low-voltage battery 1, and the cathode of the second diode 152 is electrically connected to the low-voltage relay 2. This configuration allows for control of different paths to power the low-voltage power chip 4 under different operating conditions, avoiding overload and improving safety.

[0056] Furthermore, the input voltage of the transformer module is 350-750V, and the output voltage is 12-18V. This configuration allows for precise control of the voltage conversion device, ensuring a stable supply voltage to the low-voltage power chip 4 and preventing vehicle loss of control due to voltage fluctuations.

[0057] In one embodiment of this application, when the voltage output by the low-voltage battery 1 is greater than the set minimum low-voltage value and the signal output by the ignition switch 3 is higher than the low point, it is considered to be in normal working condition. At this time, the low-voltage power supply system draws power from the low-voltage battery 1, and the control chip 13 and the ignition switch 3 together maintain the low-voltage relay 2 on, and the fault protection will not be triggered.

[0058] In one embodiment of this application, when the voltage output by the low-voltage battery 1 is greater than the set minimum low-voltage value and the signal output by the ignition switch 3 is lower than or equal to the low point, it is considered a normal power-off state. At this time, after the control chip 13 detects the power-off, it keeps the low-voltage relay 2 on for a period of time (5-15ms) to allow the entire electrical architecture to perform information storage, data processing and self-testing. After the information storage is completed, the control module 10 disconnects the low-voltage relay 2, so that the vehicle low-voltage power chip 4 is de-energized.

[0059] In one embodiment of this application, when the voltage output by the low-voltage battery 1 is less than or equal to the set minimum low-voltage value, and the signal output by the ignition switch 3 is higher than the low point, it is considered a low-voltage failure state. At this time, the low-voltage power supply system draws power from the high-voltage battery 6 through the voltage conversion device 5, and the control chip 13 keeps the low-voltage relay 2 on until the signal from the ignition switch 3 disappears.

[0060] In one embodiment of this application, when the voltage output by the low-voltage battery 1 is less than or equal to the set minimum low-voltage value, and the signal output by the ignition switch 3 is lower than or equal to the low point, it is considered to be in a dormant state (the driver has no intention to drive and has not performed any power-on operation). At this time, the protection is triggered, the control chip 13 controls the switch module 11 to enter the cut-off state, and the voltage conversion device 5 does not output voltage to prevent accidents from happening.

[0061] In another embodiment of this application, a vehicle is also provided, including a low-voltage power supply system for the vehicle, wherein the low-voltage power supply system for the vehicle is the same as the low-voltage power supply system for the vehicle described in the above embodiments.

[0062] Specifically, the low-voltage power supply system for the vehicle includes a battery pack, a voltage conversion device 5, and a low-voltage power chip 4. The battery pack includes a low-voltage battery 1 and a high-voltage battery 6. The first connection terminal of the voltage conversion device 5 is connected to the high-voltage battery 6. The voltage conversion device 5 includes a transformer module, which is electrically connected to the high-voltage battery 6. The second connection terminal of the voltage conversion device 5 is connected to the low-voltage power chip 4 through a low-voltage relay 2. The third connection terminal of the voltage conversion device 5 is connected to the low-voltage relay 2 through an ignition switch 3. One end of the low-voltage battery 1 is connected to the voltage conversion device 5, and the other end of the low-voltage battery 1 is connected to the low-voltage power chip 4 through the low-voltage relay 2. The low-voltage battery 1 is connected in parallel with the ignition switch 3. When the low-voltage battery 1 is in an abnormal working state and the ignition switch 3 is powered on, the voltage conversion device 5 converts the high-voltage current output by the high-voltage battery 6 into a low-voltage current to power the low-voltage power chip 4.

[0063] In a specific embodiment of this application, taking a 24V system as an example, the minimum low-voltage voltage is set to 9V, and the low-voltage position of the ignition switch is set to 2V. When the low-voltage battery 1 is in an abnormal working state (the voltage output by the low-voltage battery 1 is less than or equal to the set minimum low-voltage voltage), and the ignition switch 3 is powered on (the signal output by the ignition switch 3 is higher than the low-voltage position), the voltage conversion device 5 converts the high-voltage current output by the high-voltage battery 6 into a low-voltage current to power the low-voltage power chip 4, temporarily supplying low voltage to the vehicle to prevent vehicle loss of control. This solves the problem of low-voltage system failure caused by the sudden disconnection of the low-voltage battery during driving, which in turn leads to vehicle loss of control, thus ensuring driving safety.

[0064] As can be seen from the above description, the embodiments of this application achieve the following technical effects:

[0065] When the low-voltage battery 1 is in an abnormal working state and the ignition switch 3 is powered on, the transformer module in the voltage conversion device 5 converts the high-voltage current output by the high-voltage battery 6 into a low-voltage current to power the low-voltage power chip 4, temporarily supplying low voltage to the vehicle, preventing the vehicle from losing control, solving the problem of the low-voltage system failing due to the sudden disconnection of the low-voltage battery during driving, and thus causing the vehicle to lose control, ensuring driving safety.

[0066] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0067] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this application.

[0068] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0069] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A low-voltage power supply system for vehicles, characterized in that, include: A battery pack, the battery pack comprising a low-voltage battery (1) and a high-voltage battery (6); A voltage conversion device (5) is provided, the first connection terminal of which is connected to the high-voltage battery (6). The voltage conversion device (5) includes a transformer module, which is electrically connected to the high-voltage battery (6). The low-voltage power chip (4) is connected to the low-voltage power chip (4) via the second connection terminal of the voltage conversion device (5) through the low-voltage relay (2), and the third connection terminal of the voltage conversion device (5) is connected to the low-voltage relay (2) via the ignition switch (3). One end of the low-voltage battery (1) is connected to the voltage conversion device (5), and the other end of the low-voltage battery (1) is connected to the low-voltage power chip (4) via the low-voltage relay (2). The low-voltage battery (1) is connected in parallel with the ignition switch (3). When the low-voltage battery (1) is in an abnormal working state and the ignition switch (3) is powered on, the voltage conversion device (5) converts the high-voltage current output by the high-voltage battery (6) into a low-voltage current to power the low-voltage power chip (4).

2. The low-voltage power-on system according to claim 1, characterized in that, The voltage conversion device (5) includes: A switching transistor module (11), one end of which is electrically connected to the transformer module; The control module (10) has its first end electrically connected to the other end of the switch module (11), its second end electrically connected to at least one of the transformer module and the high-voltage battery (6), its third end electrically connected to the low-voltage relay (2) through the low-voltage battery (1), and its fourth end electrically connected to the low-voltage relay (2) through the ignition switch (3). A rectifier module (9) is provided, one end of which is electrically connected to the transformer module, and the other end of which is connected to the path between the low-voltage battery (1) and the low-voltage relay (2).

3. The low-voltage power-on system according to claim 2, characterized in that, The transformer module includes: The transformer main coil (7) has its first end electrically connected to the high-voltage battery (6), its second end electrically connected to the rectifier module (9), and its third end electrically connected to the switch module (11). A transformer auxiliary coil (8) is provided in conjunction with the transformer main coil (7), and the output terminal of the transformer auxiliary coil (8) is electrically connected to the control module (10).

4. The low-voltage power-on system according to claim 3, characterized in that, The control module (10) includes: The control chip (13) has its first end connected to the switching transistor module (11), its second end electrically connected to at least one of the high-voltage battery (6), the transformer main coil (7) and the transformer auxiliary coil (8), its third end electrically connected to the low-voltage relay (2) through the low-voltage battery (1), and its fourth end electrically connected to the low-voltage relay (2) through the ignition switch (3).

5. The low-voltage power-on system according to claim 4, characterized in that, The control module (10) includes: An absorption circuit (12) is provided, the input terminal of which is electrically connected to the output terminal of the transformer main coil (7), and the output terminal of which is connected to the path between the high-voltage battery (6) and the transformer main coil (7).

6. The low-voltage power-on system according to claim 4 or 5, characterized in that, The control module (10) includes: The comparator is a plurality of comparators, one of which is disposed in the path between the low-voltage battery (1) and the control chip (13), and another of the plurality of comparators is disposed in the path between the ignition switch (3) and the control chip (13).

7. The low-voltage power-on system according to claim 6, characterized in that, The comparator includes: The first comparator (141) has its positive pin electrically connected to the low-voltage battery (1), its negative pin electrically connected to the control chip (13), and its output terminal electrically connected to the control chip (13). The second comparator (142) has its positive pin electrically connected to the ignition switch (3), its negative pin grounded, and its output terminal electrically connected to the control chip (13).

8. The low-voltage power-on system according to claim 2, characterized in that, The low-voltage power supply system includes: The first diode (151) has its anode electrically connected to the rectifier module (9) and its cathode electrically connected to the low-voltage battery (1) and the low-voltage relay (2). The second diode (152) has its anode electrically connected to the low-voltage battery (1) and its cathode electrically connected to the low-voltage relay (2).

9. The low-voltage power-on system according to claim 1, characterized in that, The input voltage of the transformer module is 350-750V, and the output voltage of the transformer module is 12-18V.

10. A vehicle, comprising a low-voltage power supply system for the vehicle, characterized in that, The low-voltage power supply system for vehicles is the low-voltage power supply system for vehicles as described in any one of claims 1 to 9.

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