Control method of power supply system and power supply system
By shutting off the battery disconnect unit when the vehicle has no power demand and directly connecting the low-voltage DC converter to the battery, the problem of energy waste in the existing power supply system is solved, and efficient power supply management is achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-01-04
- Publication Date
- 2026-04-07
AI Technical Summary
The existing power supply system still needs to control the operation of the battery circuit breaker and the high-voltage DC converter when the vehicle only needs power for loads with low voltage requirements, resulting in energy waste.
When the vehicle has no power demand, the control battery circuit breaker unit is turned off, and the low-voltage DC converter is directly connected to the battery. The low-voltage DC converter is turned on to supply power only when a low-voltage load demand is detected. The high-voltage DC converter is selectively turned on according to demand when the vehicle is in high-voltage operation.
This avoids the additional losses of the battery circuit breaker and the high-voltage DC converter, reduces energy waste, and improves the efficiency of the power supply system.
Smart Images
Figure CN121799233A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of vehicle technology, and in particular to a control method and power supply system for a power supply system. Background Technology
[0002] To meet the power supply needs of different vehicle loads, some vehicles' power supply systems typically need to convert the high-voltage electrical energy provided by the power battery into two different voltages to supply power to loads with varying power requirements. For example, loads with high voltage requirements, such as the vehicle's chassis module, powertrain module, and intelligent driving module, need to be supplied with 48V power, while loads with low voltage requirements, such as the vehicle's entertainment module, cockpit module, and sentry module, need to be supplied with 12V power.
[0003] In related technologies, power supply systems typically transfer electrical energy from the power battery to a high-voltage direct current converter (HDC converter) by controlling the conduction of the battery circuit breaker unit. The HDC converter then supplies power to loads with high voltage requirements. For loads with low voltage requirements, a low-voltage direct current converter is used to further step down the output voltage of the HDC converter before supplying it to the load with low voltage requirements.
[0004] However, in this power supply system, when the vehicle only needs power for loads with low voltage requirements, and the vehicle has no power requirements and the loads with high voltage requirements do not need power, it is still necessary to control the battery circuit breaker to conduct and control the high-voltage DC converter to operate in order to supply power to the loads with low voltage requirements. At this time, the operation of the battery circuit breaker and the high-voltage DC converter will cause additional energy loss, thus resulting in energy waste. Summary of the Invention
[0005] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. This summary section is not intended to limit the key and essential technical features of the claimed technical solutions, nor is it intended to determine the scope of protection of the claimed technical solutions.
[0006] In a first aspect, this application provides a control method for a power supply system. The power supply system is used to supply power to a first load and a second load of a vehicle. The operating voltage of the first load is higher than that of the second load. The power supply system includes a battery, a battery circuit breaker unit, a high-voltage DC-DC converter, and a low-voltage DC-DC converter. The input terminal of the battery circuit breaker unit is connected to the battery. The input terminal of the high-voltage DC-DC converter is connected to the output terminal of the battery circuit breaker unit. The output terminal of the high-voltage DC-DC converter is connected to the first load. The input terminal of the low-voltage DC-DC converter is connected to the battery. The output terminal of the low-voltage DC-DC converter is connected to the second load. The control method includes: In response to the vehicle's low-voltage operation command, the battery circuit breaker unit is controlled to close, so that the vehicle is in a low-voltage operation state; In low-voltage operation, the high-voltage DC converter is shut down. If a power demand is detected in the second load, the low-voltage DC converter is turned on to supply power to the second load.
[0007] In some implementations, the control method further includes: In response to the vehicle's high-voltage operation command, the battery circuit breaker unit is opened to put the vehicle into a high-voltage operation state; Under high-voltage operation, the high-voltage DC converter is turned on to supply power to the first load; If the second load is detected to have no power demand, the low-voltage DC converter is controlled to shut down. If a power demand is detected in the second load, the low-voltage DC-DC converter is turned on to supply power to the second load.
[0008] In some embodiments, the vehicle further includes a third load connected to the outputs of the high-voltage DC-DC converter and the low-voltage DC-DC converter, and the control method further includes: Under high-voltage operation, if a power demand is detected in the third load and the second load does not require power, the low-voltage DC converter is controlled to shut down so that the third load is powered through the high-voltage DC converter. If a power demand is detected in both the third and second loads, the low-voltage DC-DC converter and the high-voltage DC-DC converter will be turned on. Based on the preset power supply rules, the target DC converter is determined among the low-voltage DC converter and the high-voltage DC converter; The target DC-DC converter is controlled to supply power to the third load.
[0009] In some implementations, a target DC-DC converter is determined among low-voltage and high-voltage DC-DC converters according to a preset power supply rule, including: Determine the voltage ratio based on the rated output voltages of the low-voltage DC-DC converter and the high-voltage DC-DC converter; The relative voltage of the high voltage DC converter is determined based on the first actual output voltage and voltage ratio of the high voltage DC converter. If the relative voltage is greater than the second actual output voltage of the low-voltage DC converter, the high-voltage DC converter is identified as the target DC converter. If the relative voltage is less than the second actual output voltage, the low-voltage DC-DC converter is determined as the target DC-DC converter.
[0010] In some embodiments, the power supply system further includes a battery connected to a high-voltage DC converter, and the control method further includes: Under high-voltage operation, the high-voltage DC converter is controlled to charge the battery; In low-voltage operation, if the first load and / or the third load are detected to have a power supply requirement, and the second load has no power supply requirement, the high-voltage DC converter and the low-voltage DC converter are controlled to shut down; the battery is controlled to supply power to the first load and / or the third load.
[0011] Secondly, this application proposes a power supply system for supplying power to a first load and a second load of a vehicle, wherein the operating voltage of the first load is higher than the operating voltage of the second load, and the power supply system includes a battery. Battery circuit breaker unit; the input terminal of the battery circuit breaker unit is connected to the battery. The input terminal of the high voltage DC converter is connected to the output terminal of the battery circuit breaker unit, and the output terminal of the high voltage DC converter is connected to the first load. The low-voltage DC-DC converter has its input connected to the battery and its output connected to a second load. The controller, connected to the battery disconnect unit, the high-voltage DC-DC converter, and the low-voltage DC-DC converter, is used to execute the control method of the power supply system as described in any of the above technical solutions.
[0012] In some implementations, the number of first loads is multiple, and the power supply system further includes: The first power distribution device has its input terminal connected to a high-voltage DC converter and its output terminal connected to multiple first loads. The first power distribution device is used to distribute electrical energy to the multiple first loads.
[0013] In some embodiments, the power supply system further includes a battery connected to a first power distribution device, the battery being used to receive electrical energy distributed by the first power distribution device for charging, or to provide electrical energy to the first power distribution device to supply power to a first load.
[0014] In some implementations, the number of second loads is multiple, and the power supply system further includes: The second power distribution unit has its input terminal connected to a low-voltage DC converter and its output terminal connected to multiple second loads. The second power distribution unit is used to distribute electrical energy to the multiple second loads.
[0015] In some implementations, the vehicle also includes a third load; The output terminals of both the high-voltage DC converter and the low-voltage DC converter are connected to a third load.
[0016] Thirdly, an electronic device includes: a processor, a memory, and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor communicates with the memory via the bus, and the machine-readable instructions are executed by the processor to perform the steps of the power supply system control method as described in any of the above technical solutions.
[0017] Fourthly, this application also proposes a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the power supply system control method as described in any of the above technical solutions.
[0018] In summary, the power supply system control method provided in this application directly connects the low-voltage DC-DC converter to the battery. This allows the battery circuit breaker to stop operating when the vehicle has no power demand. At this time, if a power demand is detected in the second load, the low-voltage DC-DC converter can be directly controlled to operate, thereby providing power to the second load without requiring the operation of the battery circuit breaker and the high-voltage DC-DC converter. This avoids additional energy loss caused by the operation of the battery circuit breaker and the high-voltage DC-DC converter, thus preventing energy waste. Attached Figure Description
[0019] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit this specification. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A flowchart illustrating a control method for a power supply system provided in an embodiment of this application; Figure 2 A circuit diagram of a power supply system provided in an embodiment of this application; Figure 3 A structural block diagram of a control device for a power supply system provided in an embodiment of this application; Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application.
[0020] Figure label: 200 Power supply system, 202 Battery, 204 Battery circuit breaker unit, 206 High voltage DC converter, 208 Low voltage DC converter, 212 First power distribution unit, 214 Storage battery, 216 Second power distribution unit, 302 First load, 304 Second load, 306 Third load, 402 Control unit, 500 Electronic equipment, 510 Memory, 511 Computer program, 512 Processor. Detailed Implementation
[0021] The terms "first," "second," "third," "fourth," etc. (if present) 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 data can be interchanged where appropriate so that the embodiments described herein can be implemented in a sequence other than that illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover 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. The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.
[0022] Please see Figure 1 This is a schematic flowchart of a control method for a power supply system provided in an embodiment of this application. The power supply system is used to supply power to a first load and a second load of a vehicle. The operating voltage of the first load is higher than that of the second load. The power supply system includes a battery, a battery circuit breaker unit, a high-voltage DC-DC converter, and a low-voltage DC-DC converter. The input terminal of the battery circuit breaker unit is connected to the battery, the input terminal of the high-voltage DC-DC converter is connected to the output terminal of the battery circuit breaker unit, the output terminal of the high-voltage DC-DC converter is connected to the first load, the input terminal of the low-voltage DC-DC converter is connected to the battery, and the output terminal of the low-voltage DC-DC converter is connected to the second load.
[0023] The power supply system control method proposed in this application can be used to control the operation of a vehicle's power supply system. Specifically, the power supply system can supply power to a first load and a second load of the vehicle. It should be noted that the first load can be a high-voltage load in the vehicle, such as the chassis module, powertrain module, and intelligent driving module. Correspondingly, the second load can be a low-voltage load in the vehicle, such as the entertainment module, cockpit module, and sentry module. That is, the operating voltage of the first load is higher than the operating voltage of the second load.
[0024] Furthermore, the power supply system may specifically include a battery, a battery disconnect unit (BDU), a high-voltage DC-DC converter, and a low-voltage DC-DC converter. The battery provides electrical energy for the normal operation of the vehicle. For example, when the vehicle needs to move, the battery can provide power to the vehicle's motor, enabling the motor to operate and provide driving force to the vehicle. Simultaneously, the electrical energy provided by the battery can be converted to provide power to other electrical devices in the vehicle.
[0025] The input terminal of the battery circuit breaker unit is connected to the battery. The battery circuit breaker unit may include a main relay, a pre-charge relay, a pre-charge resistor, a fuse, a current sensor, etc. By controlling the on / off state of the main relay, the connection between the battery and the electrical equipment can be switched on or off.
[0026] The input of the high-voltage DC-DC converter is connected to the output of the battery circuit breaker unit, and the output of the high-voltage DC-DC converter is connected to the first load. That is, the high-voltage DC-DC converter can convert the electrical energy output from the battery circuit breaker unit into the electrical energy required by the first load. For example, the high-voltage DC-DC converter can be a 48V DC-DC power converter, which can convert the electrical energy provided by the battery into 48V electrical energy to power the vehicle's chassis module, powertrain module, and intelligent driving module.
[0027] The input of the low-voltage DC-DC converter is connected to the battery, and the output is connected to the second load. That is, the low-voltage DC-DC converter can convert the electrical energy output from the battery into the electrical energy required by the second load. For example, the low-voltage DC-DC converter can be a 12V DC-DC power converter, which can convert the electrical energy provided by the battery into 12V electrical energy to power the vehicle's entertainment module, cockpit module, and sentry module.
[0028] It's important to note that the input of the low-voltage DC-DC converter is directly connected to the battery. This means the electrical energy input to the low-voltage DC-DC converter is not provided through the battery disconnect unit. Therefore, when the vehicle has no power demand, the battery disconnect unit can be controlled to stop operating. At this time, if a power demand is detected from a second load, the low-voltage DC-DC converter can be directly controlled to operate, thereby providing power to the second load without requiring the battery disconnect unit and the high-voltage DC-DC converter to operate. This avoids additional energy loss caused by the operation of the battery disconnect unit and the high-voltage DC-DC converter, thus preventing energy waste.
[0029] In addition, such as Figure 2 As shown, in practical applications, the battery, battery circuit breaker unit, and low-voltage DC-DC converter can be integrated into the same power battery pack. A Battery Management System (BMS) can also be installed within the battery pack to manage its operation.
[0030] The control methods for a power supply system may specifically include: S110, in response to the vehicle's low-voltage operation command, controls the battery circuit breaker unit to close, so that the vehicle is in a low-voltage operation state.
[0031] In the power supply system control process, the first step is to detect whether a low-voltage operation command from the vehicle has been received. It's important to note that this command can be issued by the user. Specifically, in response to user actions on vehicle buttons, the vehicle's control system sends a low-voltage operation command to the cockpit control domain. In other words, the low-voltage operation command can be sent by the cockpit control domain based on user input. The low-voltage operation command indicates that the vehicle does not need to be driven, meaning that power is not required to the vehicle's motors or other power equipment. Therefore, if a low-voltage operation command is received, the battery circuit breaker can be closed in response, thus eliminating the need for the battery to provide power to the vehicle's power equipment, and thus putting the vehicle into a low-voltage operation state.
[0032] Optionally, the low-voltage operation command can also be triggered based on the vehicle status. For example, when the user turns off the engine and the vehicle's control system detects that the vehicle is in a power-off state, the vehicle's control system sends a low-voltage operation command to the power supply system to control the battery disconnect unit to close.
[0033] S120. In low-voltage operation, control the high-voltage DC converter to shut down.
[0034] Specifically, in low-voltage operation, since the battery circuit breaker is in the closed state, the battery circuit breaker cannot provide the power supplied by the battery to the high-voltage DC converter. At this time, the high-voltage DC converter can be controlled to shut down, thereby avoiding the loss of power caused by the high-voltage DC converter being continuously powered on in low-voltage operation.
[0035] S130. If a power demand is detected in the second load, control the low-voltage DC converter to turn on to supply power to the second load.
[0036] Specifically, when the vehicle is operating under low voltage, the power supply demand of the second load can be continuously monitored. If the power supply demand of the second load is detected, the low-voltage DC-DC converter can be controlled to operate, thereby converting the electrical energy provided by the battery into the electrical energy required by the second load to meet the operating requirements of the second load.
[0037] Meanwhile, it is understandable that since the input of the low-voltage DC-DC converter is directly connected to the battery, the electrical energy input to the low-voltage DC-DC converter is not provided through the battery circuit breaker unit. In this way, when the battery circuit breaker unit is closed, the low-voltage DC-DC converter can be directly controlled to provide electrical energy to the second load without the need for the battery circuit breaker unit and the high-voltage DC-DC converter to operate. This avoids the additional energy loss caused by the operation of the battery circuit breaker unit and the high-voltage DC-DC converter, thus avoiding the waste of electrical energy.
[0038] Additionally, it should be noted that the power demand of the second load can be initiated by the user. Specifically, the user can directly operate the vehicle's display screen or other entertainment modules, or manipulate the vehicle's cockpit function buttons to send control commands to the vehicle's control system. Alternatively, the user can send remote control commands to the vehicle's control system via a mobile phone or other electronic device that communicates with the vehicle. Upon receiving the control command from the user, the vehicle's control system can determine that the second load currently has a power demand.
[0039] In summary, the power supply system control method provided in this application directly connects the low-voltage DC-DC converter to the battery. This allows the battery circuit breaker to stop operating when the vehicle has no power demand. At this time, if a power demand is detected in the second load, the low-voltage DC-DC converter can be directly controlled to operate, thereby providing power to the second load without requiring the operation of the battery circuit breaker and the high-voltage DC-DC converter. This avoids additional energy loss caused by the operation of the battery circuit breaker and the high-voltage DC-DC converter, thus preventing energy waste.
[0040] In some instances, the control methods also include: In response to the vehicle's high-voltage operation command, the battery circuit breaker unit is opened to put the vehicle into a high-voltage operation state; Under high-voltage operation, the high-voltage DC converter is turned on to supply power to the first load; If the second load is detected to have no power demand, the low-voltage DC converter is controlled to shut down. If a power demand is detected in the second load, the low-voltage DC-DC converter is turned on to supply power to the second load.
[0041] In this embodiment, if a high-voltage operation command is received from the vehicle, the battery circuit breaker unit can be opened in response to the command, thereby controlling the vehicle to enter a high-voltage operation state. It is understood that the high-voltage operation command can be issued by the user. Specifically, when the vehicle needs to be driven, the user can directly press the start button inside the vehicle. When the start button is pressed, a high-voltage operation command is generated, requiring the battery to supply power to the vehicle's drive system to ensure the vehicle can drive under the drive of the drive system.
[0042] Furthermore, when the vehicle is operating under high voltage, the high-voltage DC converter can be controlled to convert the electrical energy provided by the battery into the electrical energy required by the first load, thereby ensuring the normal operation of the first load.
[0043] At this time, the power supply demand of the second load can also be detected. That is, if it is detected that the second load has no power supply demand, the low-voltage DC converter can be controlled to shut down, thereby avoiding the low-voltage DC converter from being in a continuously powered state and causing additional power loss.
[0044] Accordingly, if a power demand is detected in the second load, the low-voltage DC-DC converter can be turned on, so that the low-voltage DC-DC converter can convert the power supplied by the battery into the power required by the second load, so as to ensure that the second load can operate normally.
[0045] In summary, when the vehicle is operating under high voltage, by detecting the power supply demand of the second load, the low-voltage DC converter is turned on when the second load has a power supply demand, and turned off when the second load does not have a power supply demand. This can both avoid the additional power loss caused by the low-voltage DC converter when the second load has no power supply demand and ensure normal operation when the second load has a power supply demand.
[0046] In some instances, the vehicle also includes a third load connected to the outputs of the high-voltage DC-DC converter and the low-voltage DC-DC converter, and the control method further includes: Under high-voltage operation, if a power demand is detected in the third load and the second load does not require power, the low-voltage DC converter is controlled to shut down so that the third load is powered through the high-voltage DC converter. If a power demand is detected in both the third and second loads, the low-voltage DC-DC converter and the high-voltage DC-DC converter will be turned on. Based on the preset power supply rules, the target DC converter is determined among the low-voltage DC converter and the high-voltage DC converter; The target DC-DC converter is controlled to supply power to the third load.
[0047] In this embodiment, the vehicle may further include a third load. Specifically, the third load can be simultaneously connected to the output of both the high-voltage DC-DC converter and the low-voltage DC-DC converter. That is, the third load can operate based on either the higher voltage output by the high-voltage DC-DC converter or the lower voltage output by the low-voltage DC-DC converter. For example, the third load may include the vehicle's anti-theft module, airbags, and vehicle control devices, etc.
[0048] When the vehicle is operating at high voltage, both the battery circuit breaker and the high-voltage DC-DC converter are in the ON state, meaning the high-voltage DC-DC converter can supply power to the third load. At this time, it's possible to detect whether the second load requires power. If the second load does not require power, the low-voltage DC-DC converter can be shut down, thus eliminating the need to supply power to the third load through the low-voltage DC-DC converter; power can then be supplied solely through the high-voltage DC-DC converter.
[0049] Correspondingly, if a second load is also detected to have a power demand, the low-voltage DC-DC converter can be turned on to supply power to the second load.
[0050] In other words, when the second load has a power demand, since both the high-voltage DC-DC converter and the low-voltage DC-DC converter are in the on state, both can supply power to the third load. At this time, it is necessary to determine the target DC-DC converter between the high-voltage DC-DC converter and the low-voltage DC-DC converter according to the preset power supply rules, so that the third load is supplied through the target DC-DC converter. That is, the target DC-DC converter is one of the high-voltage DC-DC converter and the low-voltage DC-DC converter.
[0051] It is understandable that although both the high-voltage DC converter and the low-voltage DC converter can supply power to the third load, the operation of the third load only requires one of the DC converters. Therefore, the preset power supply rules can be determined by combining the actual operating conditions of the vehicle, the power supply efficiency of the third load, and the power loss. Then, the target DC converter can be determined between the high-voltage DC converter and the low-voltage DC converter according to the preset power supply rules, and the target DC converter can supply power to the third load.
[0052] In summary, when the vehicle is operating at high voltage, if a power demand is detected in the third load and the second load does not, the low-voltage DC-DC converter can be shut down to supply power to the third load via the high-voltage DC-DC converter. If a power demand is detected in both the third and second loads, a target DC-DC converter can be selected between the high-voltage and low-voltage DC-DC converters according to preset rules. The target DC-DC converter then supplies power to the third load, thus ensuring the power supply efficiency of the third load and reducing additional energy loss.
[0053] In some instances, the target DC-DC converter is determined among low-voltage and high-voltage DC-DC converters based on preset power supply rules, including: Determine the voltage ratio based on the rated output voltages of the low-voltage DC-DC converter and the high-voltage DC-DC converter; The relative voltage of the high voltage DC converter is determined based on the first actual output voltage and voltage ratio of the high voltage DC converter. If the relative voltage is greater than the second actual output voltage of the low-voltage DC converter, the high-voltage DC converter is identified as the target DC converter. If the relative voltage is less than the second actual output voltage, the low-voltage DC-DC converter is determined as the target DC-DC converter.
[0054] In this embodiment, when the vehicle is operating under high voltage, if both the third load and the second load are detected to have power supply requirements, the low-voltage DC converter is controlled to turn on. Both the high-voltage DC converter and the low-voltage DC converter are in the on state. At this time, a target DC converter needs to be determined between the high-voltage DC converter and the low-voltage DC converter in order to supply power to the third load through the target DC converter.
[0055] Specifically, the process of determining the target DC-DC converter begins by determining the voltage ratio based on the rated output voltages of the low-voltage and high-voltage DC-DC converters. For example, if the rated output voltage of the high-voltage DC-DC converter is 48V and the rated output voltage of the low-voltage DC-DC converter is 12V, then the voltage ratio is 48 ÷ 12 = 4.
[0056] Then, the first actual output voltage of the high-voltage DC-DC converter is obtained. It should be noted that the actual output voltage of the high-voltage DC-DC converter and the low-voltage DC-DC converter may differ slightly from the rated output voltage during actual operation. For example, if the rated output voltage of the high-voltage DC-DC converter is 48V, the control system can adjust the specific operating parameters of the high-voltage DC-DC converter according to the actual operating conditions during operation, so that the actual output voltage of the high-voltage DC-DC converter is 48.3V or 47.8V.
[0057] After obtaining the first actual output voltage of the high-voltage DC-DC converter, the relative voltage of the high-voltage DC-DC converter relative to the low-voltage DC-DC converter can be determined based on the first actual output voltage and the voltage ratio. For example, if the first actual output voltage of the high-voltage DC-DC converter is 48.4V, then the relative voltage of the high-voltage DC-DC converter can be calculated as 48.4 ÷ 4 = 12.1V.
[0058] Furthermore, the relative voltage of the high-voltage DC converter is compared with the second actual output voltage of the low-voltage DC converter. If the relative voltage of the high-voltage DC converter is greater than the second actual output voltage of the low-voltage DC converter, the high-voltage DC converter can be used as the target DC converter to power the third load. Conversely, if the relative voltage of the high-voltage DC converter is less than the second actual output voltage of the low-voltage DC converter, the low-voltage DC converter can be used as the target DC converter to power the third load.
[0059] For example, if the first actual output voltage of the high-voltage DC converter is 48.4V and the second actual output voltage of the low-voltage DC converter is 11.9V, the relative voltage of the high-voltage DC converter can be calculated to be 48.4 ÷ 4 = 12.1V, and 12.1 > 11.9V. In this case, the high-voltage DC converter can be used as the target DC converter to supply power to the third load.
[0060] Additionally, it should be noted that if the relative voltage of the high-voltage DC converter is equal to the second actual output voltage of the low-voltage DC converter, then either the high-voltage DC converter or the low-voltage DC converter can be selected to power the third load according to the preset power supply mode. For example, if the control system is preset to directly select the high-voltage DC converter to power the third load in this situation, then when the relative voltage of the high-voltage DC converter is equal to the second actual output voltage of the low-voltage DC converter, the high-voltage DC converter will be directly controlled to power the third load.
[0061] In summary, when both the high-voltage DC converter and the low-voltage DC converter are in the ON state, the relative voltage of the high-voltage DC converter is calculated and then compared with the second actual output voltage of the low-voltage DC converter. This allows the target DC converter to be determined between the high-voltage and low-voltage DC converters. The target DC converter then supplies power to the third load, thereby ensuring the power supply efficiency of the third load and reducing additional energy loss.
[0062] In some instances, the power supply system also includes a battery connected to a high-voltage DC converter, and the control methods also include: Under high-voltage operation, the high-voltage DC converter is controlled to charge the battery; In low-voltage operation, if the first load and / or the third load are detected to have a power supply requirement, and the second load has no power supply requirement, the high-voltage DC converter and the low-voltage DC converter are controlled to shut down; the battery is controlled to supply power to the first load and / or the third load.
[0063] In this embodiment, the power supply system may further include a storage battery. By installing a storage battery, electrical energy can be stored to ensure the vehicle's power supply. Specifically, the rated voltage of the storage battery is the same as the rated output voltage of the high-voltage direct current converter. When the vehicle is in a high-voltage operating state, that is, when the battery disconnect unit is operating, the high-voltage direct current converter can be controlled to convert the energy supplied by the battery into electrical energy corresponding to that of the storage battery. This converted electrical energy is then transferred to the storage battery through the high-voltage direct current converter to charge the storage battery.
[0064] Furthermore, when the vehicle is operating at low voltage, i.e., the battery circuit breaker is off, the high-voltage DC-DC converter cannot supply power to the first and third loads via the battery. In this situation, if either the first or third load has a power requirement, while the second load does not, both the high-voltage and low-voltage DC-DC converters can be shut down, and the battery can supply power to either the first or third load, thus satisfying the power requirements of the first and third loads when the vehicle is operating at low voltage.
[0065] In summary, by setting up a battery, electrical energy can be stored. Furthermore, when the vehicle is operating at low voltage, if the second load has no power supply requirement, the battery can supply power to either the first or third load, thus meeting the power supply requirements of the first and third loads when the vehicle is operating at low voltage.
[0066] Please see Figure 2 This is a circuit diagram of a power supply system provided in an embodiment of this application. The power supply system 200 is used to supply power to a first load 302 and a second load 304 of a vehicle. The operating voltage of the first load 302 is higher than the operating voltage of the second load 304. The power supply system 200 includes: Battery 202; Battery circuit breaker unit 204, the input terminal of battery circuit breaker unit 204 is connected to battery 202; The high voltage DC converter 206 has its input terminal connected to the output terminal of the battery circuit breaker unit 204, and its output terminal connected to the first load 302. The low-voltage DC-DC converter 208 has its input terminal connected to the battery 202 and its output terminal connected to the second load 304. The controller, connected to the battery circuit breaker unit 204, the high-voltage DC-DC converter 206, and the low-voltage DC-DC converter 208, is used to execute the control method of the power supply system as described in any of the above embodiments.
[0067] The power supply system 200 provided in this application can be used to supply power to a first load 302 and a second load 304 in a vehicle. It should be noted that the first load 302 can be a high-voltage load in the vehicle, such as a chassis module, powertrain module, or intelligent driving module. Correspondingly, the second load 304 can be a low-voltage load in the vehicle, such as an entertainment module, cockpit module, or sentry module. That is, the operating voltage of the first load 302 is higher than the operating voltage of the second load 304.
[0068] Furthermore, the power supply system 200 may specifically include a battery 202, a battery disconnect unit (BDU) 204, a high-voltage DC-DC converter 206, and a low-voltage DC-DC converter 208. The battery 202 provides electrical energy for the normal operation of the vehicle. For example, when the vehicle needs to move, the battery 202 can provide power to the vehicle's motor, enabling the motor to operate and provide driving force to the vehicle. Simultaneously, the electrical energy provided by the battery 202 can be converted to provide power to other electrical devices in the vehicle.
[0069] The input terminal of the battery circuit breaker unit 204 is connected to the battery 202. The battery circuit breaker unit 204 may include a main relay, a pre-charge relay, a pre-charge resistor, a fuse, a current sensor, etc. By controlling the on / off state of the main relay, the connection between the battery 202 and the electrical equipment can be switched on and off.
[0070] The input terminal of the high-voltage DC-DC converter 206 is connected to the output terminal of the battery circuit breaker unit 204, and the output terminal of the high-voltage DC-DC converter 206 is connected to the first load 302. That is, the high-voltage DC-DC converter 206 can convert the electrical energy output from the battery circuit breaker unit 204 into the electrical energy required by the first load 302. For example, the high-voltage DC-DC converter 206 can be a 48V DC-DC power converter, thereby converting the electrical energy provided by the battery 202 into 48V electrical energy to power the vehicle's chassis module, powertrain module, and intelligent driving module.
[0071] The input terminal of the low-voltage DC-DC converter 208 is connected to the battery 202, and the output terminal of the low-voltage DC-DC converter 208 is connected to the second load 304. That is, the low-voltage DC-DC converter 208 can convert the electrical energy output from the battery 202 into the electrical energy required by the second load 304. For example, the low-voltage DC-DC converter 208 can be a 12V DC-DC power converter, thereby converting the electrical energy provided by the battery 202 into 12V electrical energy to power the vehicle's entertainment module, cockpit module, and sentry module.
[0072] It should be noted that the input of the low-voltage DC-DC converter 208 is directly connected to the battery 202. This means the electrical energy input to the low-voltage DC-DC converter 208 is not provided through the battery disconnect unit 204. Therefore, when the vehicle has no power demand, the battery disconnect unit 204 can be controlled to stop operating. At this time, if a power demand is detected in the second load 304, the low-voltage DC-DC converter 208 can be directly controlled to operate, thereby providing electrical energy to the second load 304, without requiring the operation of the battery disconnect unit 204 and the high-voltage DC-DC converter 206. This avoids additional energy loss caused by the operation of the battery disconnect unit 204 and the high-voltage DC-DC converter 206, thus preventing energy waste.
[0073] Furthermore, the power supply system 200 may also include a controller (not shown in the figure). For example, the controller may utilize the vehicle's overall controller or may be a controller separately configured for the power supply system 200.
[0074] In summary, the power supply system 200 provided in this application directly connects the low-voltage DC-DC converter 208 to the battery 202. This allows the battery circuit breaker unit 204 to stop operating when the vehicle has no power demand. At this time, if a power demand is detected in the second load 304, the low-voltage DC-DC converter 208 can be directly operated to provide power to the second load 304, eliminating the need for the battery circuit breaker unit 204 and the high-voltage DC-DC converter 206 to operate. This avoids additional energy loss caused by the operation of the battery circuit breaker unit 204 and the high-voltage DC-DC converter 206, thus preventing energy waste.
[0075] In some instances, there are multiple first loads 302, and the power supply system 200 also includes: The first power distribution device 212 has its input terminal connected to the high voltage DC converter 206 and its output terminal connected to a plurality of first loads 302. The first power distribution device 212 is used to distribute electrical energy to the plurality of first loads 302.
[0076] In this embodiment, the number of first loads 302 installed in the vehicle can be multiple, that is, the number of loads with high voltage requirements in the vehicle can be multiple, such as the vehicle's chassis module, power module, and intelligent driving module. Accordingly, for multiple first loads 302, the power supply system 200 can also distribute power to the multiple first loads 302 by setting up a first power distribution device 212.
[0077] For example, the first power distribution device 212 may include multiple switching components, such as multiple relays. These switching components may include a main switch and multiple branch switches. The main switch is used to connect to the high-voltage DC converter 206, and the connection between the high-voltage DC converter 206 and the first power distribution device 212 can be controlled by switching the main switch on and off. Correspondingly, the multiple branch switches are used to connect to multiple first loads 302, and the power supply to each first load 302 can be controlled by switching the branch switches on and off.
[0078] In some instances, the power supply system 200 further includes a battery 214 connected to a first power distribution device 212, which receives electrical energy distributed by the first power distribution device 212 for charging or provides electrical energy to the first power distribution device 212 to supply power to the first load 302.
[0079] In this embodiment, the power supply system 200 may further include a storage battery 214. By providing the storage battery 214, electrical energy can be stored to ensure the vehicle's power supply. Specifically, the storage battery 214 can be connected to the first power distribution device 212, enabling the first power distribution device 212 to distribute the electrical energy output from the high-voltage DC converter 206 to the storage battery 214, thereby charging the storage battery 214. The rated voltage of the storage battery 214 is the same as the rated output voltage of the high-voltage DC converter 206. When the vehicle is in a high-voltage operating state, i.e., when the battery circuit breaker unit 204 is operating, the high-voltage DC converter 206 can be controlled to convert the electrical energy provided by the battery 202 into electrical energy corresponding to that of the storage battery 214, and transmit it to the storage battery 214 through the first power distribution device 212. The converted electrical energy is then transmitted to the storage battery 214 through the high-voltage DC converter 206 to charge the storage battery 214.
[0080] Furthermore, when the vehicle is operating at low voltage, i.e., the battery circuit breaker 204 is off, the high-voltage DC-DC converter 206 cannot supply power to the first load 302 and the third load using the power provided by the battery 202. In this case, if either the first load 302 or the third load has a power demand, while the second load 304 does not, both the high-voltage DC-DC converter 206 and the low-voltage DC-DC converter 208 can be turned off. Power can then be supplied to either the first load 302 or the third load via the battery 214. Specifically, the battery 214 transmits power to the first power distribution device 212, which then distributes the power from the battery 214 to either the first load 302 or the third load, thus satisfying the power demand of the first load 302 and the third load when the vehicle is operating at low voltage.
[0081] In some instances, there are multiple second loads 304, and the power supply system 200 also includes: The second power distribution device 216 has its input terminal connected to the low-voltage DC converter 208 and its output terminal connected to multiple second loads 304. The second power distribution device 216 is used to distribute electrical energy to the multiple second loads 304.
[0082] In this embodiment, the number of second loads 304 installed in the vehicle can be multiple, that is, the number of loads with low voltage requirements in the vehicle can be multiple, such as the vehicle's entertainment module, cockpit module, and sentry module. Accordingly, for multiple second loads 304, the power supply system 200 can also distribute power to the multiple second loads 304 by setting up a second power distribution device 216.
[0083] For example, the second power distribution device 216 may include multiple switching components, such as multiple relays. These switching components may include a main switch and multiple branch switches. The main switch is used to connect to the low-voltage DC-DC converter 208, and the connection between the low-voltage DC-DC converter 208 and the second power distribution device 216 can be controlled by switching the main switch on and off. Correspondingly, the multiple branch switches are used to connect to multiple second loads 304, and the power supply to each second load 304 can be controlled by switching the branch switches on and off.
[0084] In some instances, the vehicle also includes a third load 306; The output terminals of both the high-voltage DC converter 206 and the low-voltage DC converter 208 are connected to the third load 306.
[0085] In this embodiment, the vehicle may further include a third load 306. Specifically, the third load 306 can be simultaneously connected to the output terminal of the high-voltage DC-DC converter 206 and the output terminal of the low-voltage DC-DC converter 208. That is, the third load 306 can operate based on either the higher voltage output by the high-voltage DC-DC converter 206 or the lower voltage output by the low-voltage DC-DC converter 208. For example, the third load 306 may include the vehicle's anti-theft module, airbags, and vehicle control devices, etc.
[0086] When the vehicle is operating at high voltage, both the battery circuit breaker 204 and the high-voltage DC-DC converter 206 are in the open state, meaning the high-voltage DC-DC converter 206 can supply power to the third load 306. At this time, it is possible to detect whether the second load 304 has a power demand. If the second load 304 has no power demand 200, the low-voltage DC-DC converter 208 can be controlled to shut down, thus eliminating the need for the low-voltage DC-DC converter 208 to supply power to the third load 306; power can be supplied solely through the high-voltage DC-DC converter 206.
[0087] Correspondingly, if the second load 304 is also detected to have a power demand, the low-voltage DC-DC converter 208 can be turned on to supply power to the second load 304.
[0088] In other words, when the second load 304 has a power supply requirement, since both the high-voltage DC converter 206 and the low-voltage DC converter 208 are in the on state, both can supply power to the third load 306. At this time, according to the preset power supply rules, it is necessary to determine the target DC converter between the high-voltage DC converter 206 and the low-voltage DC converter 208, so that the third load 306 can be powered through the target DC converter. That is, the target DC converter is one of the high-voltage DC converter 206 and the low-voltage DC converter 208.
[0089] It is understandable that although both the high-voltage DC converter 206 and the low-voltage DC converter 208 can supply power to the third load 306, the operation of the third load 306 only requires one of the DC converters. Therefore, the preset power supply rules can be determined by combining the actual operating conditions of the vehicle, the power supply efficiency of the third load 306, and the power loss. Then, the target DC converter can be determined between the high-voltage DC converter 206 and the low-voltage DC converter 208 according to the preset power supply rules, and the third load 306 can be supplied with power through the target DC converter.
[0090] Please see Figure 3 This is a structural block diagram of a control device for a power supply system provided in an embodiment of this application. The power supply system is used to supply power to a first load and a second load of a vehicle. The operating voltage of the first load is higher than that of the second load. The power supply system includes a battery, a battery circuit breaker unit, a high-voltage DC-DC converter, and a low-voltage DC-DC converter. The input terminal of the battery circuit breaker unit is connected to the battery, the input terminal of the high-voltage DC-DC converter is connected to the output terminal of the battery circuit breaker unit, the output terminal of the high-voltage DC-DC converter is connected to the first load, the input terminal of the low-voltage DC-DC converter is connected to the battery, and the output terminal of the low-voltage DC-DC converter is connected to the second load. The control device includes: Control unit 402 is used to control the battery disconnect unit to close in response to the vehicle's low-voltage operation command, so that the vehicle is in a low-voltage operation state; In low-voltage operation, the high-voltage DC converter is shut down. If a power demand is detected in the second load, the low-voltage DC converter is turned on to supply power to the second load.
[0091] The power supply system control device provided in this application directly connects the low-voltage DC-DC converter to the battery. This allows the battery circuit breaker to stop operating when the vehicle has no power demand. At this time, if a power demand is detected in a second load, the low-voltage DC-DC converter can be directly operated to provide power to the second load, eliminating the need for the battery circuit breaker and high-voltage DC-DC converter to operate. This avoids additional energy loss caused by the operation of the battery circuit breaker and high-voltage DC-DC converter, thus preventing energy waste.
[0092] In some embodiments, the control unit 402 is specifically used for: Under high-voltage operation, the high-voltage DC converter is turned on to supply power to the first load; If the second load is detected to have no power demand, the low-voltage DC converter is controlled to shut down. If a power demand is detected in the second load, the low-voltage DC-DC converter is turned on to supply power to the second load.
[0093] In some embodiments, the vehicle further includes a third load connected to the outputs of the high-voltage DC converter and the low-voltage DC converter, and the control unit 402 is further configured to: Under high-voltage operation, if a power demand is detected in the third load and the second load does not require power, the low-voltage DC converter is controlled to shut down so that the third load is powered through the high-voltage DC converter. If a power demand is detected in both the third and second loads, the low-voltage DC-DC converter and the high-voltage DC-DC converter will be turned on. Based on the preset power supply rules, the target DC converter is determined among the low-voltage DC converter and the high-voltage DC converter; The target DC-DC converter is controlled to supply power to the third load.
[0094] In some embodiments, the control unit 402 is further configured to: Determine the voltage ratio based on the rated output voltages of the low-voltage DC-DC converter and the high-voltage DC-DC converter; The relative voltage of the high voltage DC converter is determined based on the first actual output voltage and voltage ratio of the high voltage DC converter. If the relative voltage is greater than the second actual output voltage of the low-voltage DC converter, the high-voltage DC converter is identified as the target DC converter. If the relative voltage is less than the second actual output voltage, the low-voltage DC-DC converter is determined as the target DC-DC converter.
[0095] In some embodiments, the power supply system further includes a battery connected to a high-voltage DC converter, and the determining unit is specifically used for: Under high-voltage operation, the high-voltage DC converter is controlled to charge the battery; In low-voltage operation, if the first load and / or the third load are detected to have a power supply requirement, and the second load has no power supply requirement, the high-voltage DC converter and the low-voltage DC converter are controlled to shut down; the battery is controlled to supply power to the first load and / or the third load.
[0096] Please see Figure 4 This application also provides an electronic device 500, including a memory 510, a processor 520, and a computer program 511 stored in the memory 510 and executable on the processor. When the processor 520 executes the computer program 511, it implements the steps of a power supply system control method.
[0097] Since the electronic device described in this embodiment is a device used to implement an event occurrence time determination device in the embodiments of this application, those skilled in the art can understand the specific implementation method and various variations of the electronic device in this embodiment based on the method described in the embodiments of this application. Therefore, how the electronic device implements the method in the embodiments of this application will not be described in detail here. Any device used by those skilled in the art to implement the method in the embodiments of this application falls within the scope of protection of this application.
[0098] In practice, when the computer program 511 is executed by the processor, it can implement any of the embodiments corresponding to the first aspect.
[0099] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.
[0100] Those skilled in the art will understand that embodiments of this application can provide methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-readable storage media containing computer-readable program code.
[0101] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.
[0102] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.
[0103] These computer program instructions can also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.
[0104] This application also provides a computer program product, which includes computer software instructions that, when executed on a processing device, cause the processing device to perform... Figure 1 The flowchart of a control method for a power supply system in a corresponding embodiment.
[0105] A computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the flow or function according to the embodiments of this application is generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, computer instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any usable medium that a computer can store or a data storage device such as a server or data center that integrates one or more usable media. The usable medium may be a magnetic medium, an optical medium, or a semiconductor medium, etc.
[0106] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.
[0107] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Furthermore, the mutual couplings or direct couplings or communication connections shown or discussed may be indirect couplings or communication connections through some interfaces, devices, or units, and may be electrical, mechanical, or other forms.
[0108] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.
[0109] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated units described above can be implemented in the form of hardware and / or software functional units.
[0110] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device to execute all or part of the steps of the methods in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory, magnetic disks, or optical disks.
[0111] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.
[0112] Although preferred embodiments have been described in this specification, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications that fall outside the scope of this specification.
[0113] Obviously, those skilled in the art can make various modifications to this specification without departing from its spirit and scope. Therefore, this specification also intends to include any modifications that fall within the scope of the claims and their equivalents.
Claims
1. A control method for a power supply system, characterized in that, The power supply system is used to supply power to a first load and a second load of the vehicle. The operating voltage of the first load is higher than that of the second load. The power supply system includes a battery, a battery circuit breaker unit, a high-voltage DC-DC converter, and a low-voltage DC-DC converter. The input terminal of the battery circuit breaker unit is connected to the battery. The input terminal of the high-voltage DC-DC converter is connected to the output terminal of the battery circuit breaker unit. The output terminal of the high-voltage DC-DC converter is connected to the first load. The input terminal of the low-voltage DC-DC converter is connected to the battery. The output terminal of the low-voltage DC-DC converter is connected to the second load. The control method includes: In response to the low-voltage operation command of the vehicle, the battery circuit breaker unit is controlled to close, so that the vehicle is in a low-voltage operation state; In the low-voltage operating state, the high-voltage DC converter is controlled to shut down; If a power demand is detected in the second load, the low-voltage DC converter is turned on to supply power to the second load.
2. The power supply system according to claim 1, characterized in that, Also includes: In response to the high-voltage operation command of the vehicle, the battery circuit breaker unit is controlled to open, so that the vehicle is in a high-voltage operation state; Under the high-voltage operating state, the high-voltage DC converter is turned on to supply power to the first load; If it is detected that the second load has no power supply requirement, the low-voltage DC converter is controlled to shut down; If a power demand is detected in the second load, the low-voltage DC-DC converter is turned on to supply power to the second load.
3. The power supply system according to claim 2, characterized in that, The vehicle also includes a third load connected to the outputs of the high-voltage DC converter and the low-voltage DC converter, and the control method further includes: In the high-voltage operation state, if the third load is detected to have a power supply requirement and the second load has no power supply requirement, the low-voltage DC converter is controlled to be turned off so that the third load is powered through the high-voltage DC converter. If it is detected that both the third load and the second load have a power demand, then control the low-voltage DC converter and the high-voltage DC converter to turn on; According to the preset power supply rules, a target DC converter is determined among the low-voltage DC converter and the high-voltage DC converter; Control the target DC-DC converter to supply power to the third load.
4. The power supply system according to claim 3, characterized in that, The step of determining the target DC converter among the low-voltage DC converter and the high-voltage DC converter according to a preset power supply rule includes: The voltage ratio is determined based on the rated output voltages of the low-voltage DC-DC converter and the high-voltage DC-DC converter; The relative voltage of the high voltage DC converter is determined based on the first actual output voltage of the high voltage DC converter and the voltage ratio. If the relative voltage is greater than the second actual output voltage of the low-voltage DC converter, the high-voltage DC converter is identified as the target DC converter. If the relative voltage is less than the second actual output voltage, the low-voltage DC-DC converter is determined as the target DC-DC converter.
5. The power supply system according to claim 3, characterized in that, The power supply system further includes a battery connected to the high-voltage DC converter, and the control method further includes: Under the high-voltage operating condition, the high-voltage DC converter is controlled to charge the battery; In the low-voltage operation state, if the first load and / or the third load are detected to have a power supply requirement, and the second load has no power supply requirement, then the high-voltage DC converter and the low-voltage DC converter are controlled to be turned off; and the battery is controlled to supply power to the first load and / or the third load.
6. A power supply system, characterized in that, The power supply system is used to supply power to a first load and a second load of the vehicle, wherein the operating voltage of the first load is higher than the operating voltage of the second load, and the power supply system includes: Battery; A battery circuit breaker unit, the input of which is connected to the battery; A high-voltage DC converter, wherein the input terminal of the high-voltage DC converter is connected to the output terminal of the battery circuit breaker unit, and the output terminal of the high-voltage DC converter is connected to the first load; A low-voltage DC-DC converter, wherein the input terminal of the low-voltage DC-DC converter is connected to the battery, and the output terminal of the low-voltage DC-DC converter is connected to the second load; A controller, connected to the battery circuit breaker unit, the high-voltage DC-DC converter, and the low-voltage DC-DC converter, is used to execute the control method of the power supply system as described in any one of claims 1 to 5.
7. The power supply system according to claim 6, characterized in that, The number of the first loads is multiple, and the power supply system further includes: A first power distribution device, the input terminal of which is connected to the high voltage DC converter, and the output terminal of which is connected to a plurality of first loads, the first power distribution device being used to distribute electrical energy to the plurality of first loads.
8. The power supply system according to claim 7, characterized in that, Also includes: A storage battery is connected to the first power distribution device. The storage battery is used to receive electrical energy distributed by the first power distribution device for charging, or to provide electrical energy to the first power distribution device to supply power to the first load.
9. The power supply system according to claim 6, characterized in that, The number of the second load is multiple, and the power supply system further includes: The second power distribution device has its input terminal connected to the low-voltage DC converter and its output terminal connected to a plurality of second loads. The second power distribution device is used to distribute electrical energy to the plurality of second loads.
10. The power supply system according to claim 6, characterized in that, The vehicle also includes a third load; The output terminals of both the high-voltage DC converter and the low-voltage DC converter are connected to the third load.