Power supply system of power chassis domain and related method

Abstract

The invention discloses a power supply system of a power chassis domain and a related method, redundant power supply is realized through a high-low voltage power conversion unit, a buck-boost power conversion unit and a redundant input switching unit, the power supply stability of the power chassis domain can be ensured under the condition of voltage fluctuation or fault of a low-voltage battery, and the reliability of the power chassis domain is improved. And the output monitoring and management unit is also arranged, so that when the power utilization of the controller fails, the power supply of the failed power utilization controller can be cut off and isolated, and the failed power utilization controller is effectively prevented from influencing other controllers.

Description

Technical Field

[0001] The present invention relates to a power supply system in a power chassis domain and a related method, belonging to the field of new energy vehicles. Background Art

[0002] With the rise of new energy vehicles, intelligence, networking and informatization have been further promoted in electric vehicles. Faced with the complexity of vehicle functions, new electronic and electrical architectures have also emerged. Among them, domain-oriented electronic and electrical architectures stand out due to their strong functional decoupling and concentrated software computing power.

[0003] In the domain-oriented electrical and electronic architecture, the power and chassis are integrated into a domain, namely the power chassis domain, which includes the management of the power battery and the power unit (motor controller). Under the new architecture, this domain has generated new functional requirements and functional safety levels (the highest level), and the traditional 12V lead-acid / lithium-ion battery (i.e. low-voltage battery) power supply method is no longer adaptable.

[0004] The power supply of the power chassis domain under the new architecture has the following problems: 1. How to ensure the monitoring and isolation of the low-voltage power supply failure of a single controller in the power chassis domain; 2. How to provide stable power supply to some safety components in the event of voltage fluctuation or failure of the 12V lead-acid / lithium battery. Therefore, a solution to the power supply problem of the power chassis domain under the new architecture is urgently needed. Summary of the invention

[0005] The present invention provides a power supply system for a power chassis domain and a related method, which solves the problems disclosed in the background technology.

[0006] According to one aspect of the present disclosure, there is provided a power supply system for a power chassis domain, comprising a high-low voltage power conversion unit, a buck-boost power conversion unit, a redundant input switching unit, and an output monitoring and management unit; The high-voltage side input end of the high-low voltage power conversion unit is externally connected to the power battery outlet, and the low-voltage side output end of the high-low voltage power conversion unit is connected to the first input end of the redundant input switching unit; The input end of the buck-boost power conversion unit is externally connected to the low-voltage battery outlet, and the output end of the buck-boost power conversion unit is connected to the second input end of the redundant input switching unit; The redundant input switching unit selects a valid input as the output, and the output of the redundant input switching unit supplies power to each controller in the power chassis domain through the output monitoring and management unit; wherein, the output monitoring and management unit monitors the power consumption of each controller, and in the event of a power failure, cuts off and isolates the power supply to the faulty power controller.

[0007] The above system realizes redundant power supply through high and low voltage power conversion units, buck-boost power conversion units and redundant input switching units. In the event of voltage fluctuations or failure of the low voltage battery, the power supply to the power chassis domain can be stable. The above system is also provided with an output monitoring and management unit. When the power supply to the controller fails, the power supply to the faulty power controller can be cut off and isolated, effectively preventing the faulty power controller from affecting other controllers.

[0008] In some embodiments of the present disclosure, the low-voltage side output end of the high-low voltage power conversion unit is also externally connected to a low-voltage battery charging port. When the low-voltage battery is feeding power, the power battery can be directly used to charge the low-voltage battery, and the high-voltage silent power replenishment of the low-voltage battery can be started at any time, ensuring the stability of the low-voltage power supply of the vehicle when the vehicle is parked for a long time, and also ensuring that the energy consumption of the vehicle is minimized when it is parked for a long time.

[0009] In some embodiments of the present disclosure, the high-voltage side input end of the high-low voltage power conversion unit is also externally connected to the high-voltage circuit of the motor controller. When the high-voltage circuit of the motor controller is powered off, the high-voltage charge can be released through the high-low voltage power conversion unit, that is, the high-voltage charge is converted into low voltage and stored in the low-voltage battery, which greatly reduces the discharge energy consumption and reduces the heat caused by discharge.

[0010] In some embodiments of the present disclosure, the low-voltage input end of the high-low voltage power conversion unit is externally connected to the low-voltage battery outlet, and the high-voltage output end of the high-low voltage power conversion unit is externally connected to the high-voltage circuit of the motor controller. Before the power battery is powered on, the capacitor on the high-voltage circuit of the motor controller can be pre-charged directly through the low-voltage battery, saving the pre-charging time at the time of high-voltage power-on. At the same time, since the pre-charging belongs to high-efficiency energy conversion, it saves time while also reducing the heat generation and energy loss of the pre-charging.

[0011] In some embodiments of the present disclosure, if there is an isolation sensor at the positive or negative electrode of the power battery, an isolation power conversion unit is also connected in parallel to the line between the redundant input switching unit and the output monitoring and management unit, and the output of the isolation power conversion unit supplies power to the isolation sensor through the output monitoring and management unit. By providing the isolation power conversion unit, the power supply of the isolation sensor is effectively realized.

[0012] In some embodiments of the present disclosure, all power conversion units are DCDC converters, and all components can be purchased directly from the market, which greatly saves costs.

[0013] According to another aspect of the present disclosure, a power supply method for a power chassis domain is provided, wherein the power supply system for the power chassis domain is used for power supply, and the method comprises: Controlling the high-low voltage power conversion unit to convert the high voltage output by the power battery into a first low voltage, and transmitting the first low voltage to the redundant input switching unit; Controlling the buck-boost power conversion unit to convert the second low voltage output by the low-voltage battery into a third low voltage, and transmitting the third low voltage to the redundant input switching unit; If it is detected that the first low voltage and / or the third low voltage is valid, the redundant input switching unit is controlled to select the valid low voltage output.

[0014] The method realizes redundant power supply by controlling the high- and low-voltage power conversion units, the buck-boost power conversion units and the redundant input switching units, and can also ensure stable power supply in the power chassis domain in the event of voltage fluctuations or failures in the low-voltage battery.

[0015] According to another aspect of the present disclosure, a low-voltage charging method for a power chassis domain is provided, and low-voltage charging is performed using the power supply system of the power chassis domain. The method includes: if a low-voltage battery feed is detected, controlling a high-low voltage power conversion unit to convert a high voltage output by the power battery into a first low voltage, and transmitting the first low voltage to the low-voltage battery.

[0016] This method realizes charging of the low-voltage battery by the power battery by controlling the high- and low-voltage power conversion units. The high-voltage silent power replenishment of the low-voltage battery can be started at any time, ensuring the stability of the low-voltage power supply of the vehicle when the vehicle is parked for a long time, and also ensuring that the energy consumption of the vehicle is minimized when it is parked for a long time.

[0017] According to another aspect of the present disclosure, an active discharge method of a power chassis domain is provided, and active discharge is performed using the power supply system of the power chassis domain. The method includes: if it is detected that the high-voltage circuit of the motor controller is powered off, controlling the high- and low-voltage power conversion unit to convert the high voltage output by the high-voltage circuit of the motor controller into a first low voltage, and transmitting the first low voltage to the low-voltage battery.

[0018] The method can release the high-voltage charge of the high-voltage circuit of the motor controller by controlling the high-low voltage power conversion unit, that is, converting the high-voltage charge into low voltage and storing it in the low-voltage battery, which greatly reduces the discharge energy consumption and reduces the heat caused by discharge.

[0019] According to another aspect of the present disclosure, a high-voltage pre-charging method for a power chassis domain is provided, and the power supply system of the power chassis domain is used to perform high-voltage pre-charging. The method includes: if pre-charging before triggering the power battery to be powered on is detected, controlling the high- and low-voltage power conversion unit to convert the second low voltage output by the low-voltage battery into a high voltage, and delivering the high voltage to the high-voltage circuit of the motor controller to charge the capacitor on the high-voltage circuit of the motor controller.

[0020] The method realizes high-voltage pre-charging by controlling the high- and low-voltage power conversion units, and can directly pre-charge the capacitor on the high-voltage circuit of the motor controller through the low-voltage battery, saving the pre-charging time at the time of high-voltage power-on. At the same time, since the pre-charging belongs to high-efficiency energy conversion, it saves time while also reducing the heat and energy loss of the pre-charging.

[0021] The beneficial effects achieved by the present invention are as follows: 1. The present invention realizes redundant power supply through a high-low voltage power conversion unit, a buck-boost power conversion unit and a redundant input switching unit. In the case of voltage fluctuation or failure of the low-voltage battery, the stable power supply of the power chassis domain can also be guaranteed. The present invention also provides an output monitoring and management unit. When the power failure occurs in the controller, the power supply to the faulty power controller can be cut off and isolated, effectively preventing the faulty power controller from affecting other controllers. 2. The low-voltage side output end of the high-low voltage power conversion unit of the present invention is also externally connected to a low-voltage battery charging port. When the low-voltage battery is fed, the power battery can be directly used to charge the low-voltage battery, and the high-voltage silent power replenishment of the low-voltage battery can be started at any time, ensuring the stability of the low-voltage power supply of the vehicle when the vehicle is parked for a long time, and also ensuring the stability of the low-voltage power supply of the vehicle when the vehicle is parked for a long time. Energy consumption is reduced to a minimum; 3. The high-voltage side input end of the high-low voltage power conversion unit of the present invention is also externally connected to the high-voltage circuit of the motor controller. When the high-voltage circuit of the motor controller is powered on, the high-voltage charge can be released through the high-low voltage power conversion unit, that is, the high-voltage charge is converted into low voltage and stored in the low-voltage battery, which greatly reduces the discharge energy consumption and the heat caused by discharge; 4. The low-voltage side input end of the high-low voltage power conversion unit of the present invention is externally connected to the low-voltage battery outlet, and the high-voltage side output end of the high-low voltage power conversion unit is externally connected to the high-voltage circuit of the motor controller. Before the power battery is powered on, the capacitor on the high-voltage circuit of the motor controller can be pre-charged directly through the low-voltage battery, saving the pre-charging time at the time of high-voltage power-on. At the same time, since the pre-charging belongs to high-efficiency energy conversion, it saves time while also reducing the heat and energy loss of pre-charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A first structural schematic diagram of a power supply system in a power chassis domain; Figure 2 A second structural schematic diagram of the power supply system in the power chassis domain; Figure 3 A third structural schematic diagram of the power supply system in the power chassis domain; Figure 4 A fourth structural schematic diagram of the power supply system in the power chassis domain; Figure 5 A flow chart of a power supply method for a power chassis domain; Figure 6 A flow chart of a low-voltage charging method for a power chassis domain; Figure 7 It is a flow chart of the active discharge method in the power chassis domain; Figure 8 The figure is a flow chart of the high-voltage pre-charging method in the power chassis domain. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. It is obvious that the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present disclosure and its application or use. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present disclosure.

[0024] Unless otherwise specified, the relative arrangement of components and steps, the numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present disclosure.

[0025] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0026] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0027] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0028] It should be noted that similar symbols and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it does not require further discussion in subsequent figures.

[0029] In order to solve the problem of power supply in the power chassis domain under the new architecture, the present disclosure proposes a power supply system and related methods for the power chassis domain.

[0030] Figure 1 This is a schematic diagram of an embodiment of a power supply system in the power chassis domain of the present disclosure. Figure 1 The embodiment can be realized by hardware circuit, and the system mainly includes a high-low voltage power conversion unit, a buck-boost power conversion unit, a redundant input switching unit, and an output monitoring and management unit.

[0031] In the embodiment, the high-voltage side input end of the high-low voltage power conversion unit is externally connected to the power battery outlet, and the low-voltage side output end of the high-low voltage power conversion unit is connected to the first input end of the redundant input switching unit. The input end of the buck-boost power conversion unit is externally connected to the low-voltage battery outlet, and the output end of the buck-boost power conversion unit is connected to the second input end of the redundant input switching unit. The redundant input switching unit selects a valid input as the output, and the output of the redundant input switching unit supplies power to each controller in the power chassis domain through the output monitoring and management unit; wherein, the output monitoring and management unit monitors the power consumption of each controller, and in the event of a power failure, cuts off the power supply to and isolates the faulty power controller.

[0032] It should be noted that the output voltage of the power battery is generally a high voltage of 400V~800V, namely VIN_H1 in the figure, which can be converted into a first low voltage of 12V through a high-low voltage power conversion unit. That is, by converting the output voltage of the power battery, a power supply for the power chassis domain is realized.

[0033] It should be noted that the low-voltage battery, i.e., lead-acid / lithium-ion battery, generally has an output voltage range of 9V~16V, which is defined as the second lowest voltage, i.e. Figure 1 In VIN_L, the low-voltage battery will have a large voltage jitter due to load changes. The second low voltage can be converted into a third low voltage of 12V through the step-up and step-down power conversion unit. When the input voltage jitters, is low, or fluctuates, it can still output a stable 12V voltage to the load. That is, by converting the output voltage of the low-voltage battery, another power supply for the power chassis domain is realized.

[0034] The above-mentioned high-low voltage power conversion unit and buck-boost power conversion unit both use DCDC converters, and the components can be purchased directly from the market, which greatly saves costs. The DCDC converter is used to convert one direct current (DC) voltage level into another direct current voltage level. Specifically, it is through the internal switching device (such as MOSFET) quickly turning on and off, cooperating with energy storage elements such as inductors and capacitors to achieve voltage increase or decrease or reversal; among them, the high-low voltage power conversion unit can use a buck-type DCDC converter, and the buck-boost power conversion unit can use a buck-boost DCDC converter.

[0035] It should be noted that the redundant input switching unit prevents the two inputs (i.e., two 12V voltages) from interfering with and affecting each other. At the same time, when one of the inputs fails, it can seamlessly switch to the other, thus achieving redundant power supply of the two power supplies.

[0036] The redundant input switching unit is a gating circuit that quickly turns on and off the internal switch device to select one input as the output. The redundant input switching unit is an automatic switching type and does not require software (computation unit) intervention. The goal is to always maintain a valid voltage output (when at least one of the two input voltages is valid).

[0037] It should be noted that in the existing power chassis domain, the power supply is only low-voltage battery power supply. Since the low-voltage battery voltage will fluctuate due to the load, it is difficult to ensure that the core controller of the power chassis domain has a stable power supply voltage. In addition, due to the high safety level requirements of the power chassis domain, the power supply should be maintained for a period of time for relevant data recording and safety processing, and this requirement cannot be achieved in the case of low-voltage battery failure (such as battery power failure, sudden open circuit under collision, etc.). Therefore, the embodiment adopts redundant power supply, which can provide all-weather stable power supply for the controller in the power chassis domain. Even if the low-voltage battery voltage fluctuates or fails, the power supply of the controller in the power chassis domain can be guaranteed to be stable, and the functions such as vehicle power-off monitoring and safety data recording can be supported.

[0038] It should be noted that the output monitoring and management unit can be implemented through a single-chip microcomputer and supporting peripheral circuits (related monitoring, semiconductor switching circuits), which supplies power to each controller in the power chassis domain and receives the power consumption of each controller (i.e., output voltage and current) through the communication port. It can directly judge the power consumption by itself, such as overvoltage, overcurrent, etc. If an abnormality is detected, the power supply to the corresponding controller will be cut off and isolated; among them, all judgment results can be sent to the power chassis domain master controller through the communication unit.

[0039] Of course, the output monitoring and management unit can also be used in conjunction with an operation unit, which is another higher-performance single-chip microcomputer. The output monitoring and management unit will send the power consumption of each controller to the operation unit, and the power consumption will be judged by the operation unit. The operation unit will issue corresponding instructions based on the judgment results. If an abnormality is found, a cut-off isolation instruction will be issued to cut off and isolate the power supply to the corresponding controller. If there is no abnormality, no instruction will be issued or a normal instruction will be issued. Among them, all judgment results can be sent to the power chassis domain master controller through the communication unit.

[0040] It should be noted that in the existing power chassis domain, the controllers share a low-voltage battery. Although there are some fuses on the vehicle, due to the limited sensitivity and number of fuses, it is difficult to ensure that a power failure in one or more controllers will not affect the power supply of the low-voltage battery, and then affect the core controller in the power chassis domain. Therefore, an output monitoring and management unit is provided in the embodiment. When a controller has a power failure, the power supply to the faulty power controller can be cut off and isolated, effectively preventing the faulty power controller from affecting other controllers, ensuring that other controllers have normal power supply, and maximizing the functional integrity of the entire vehicle under a single controller failure.

[0041] It should be noted that there are often isolation sensors at the positive or negative poles of the power battery in the power chassis domain. The isolation sensor is a type of high-voltage sensor that includes a high-voltage sensor for monitoring the power battery voltage, an insulation resistance sensor for monitoring the insulation resistance of the power battery, or a controller for cutting off the high-voltage circuit of the power battery. These sensors require isolated power supply and cannot directly use the power supply of a low-voltage 12V lead-acid battery. Therefore, in some embodiments, an isolated power conversion unit is connected in parallel on the line between the redundant input switching unit and the output monitoring and management unit, specifically an isolated DCDC converter. The output of the isolated DCDC converter is a 12V isolation voltage and a 24V isolation voltage. The output of the isolation power conversion unit supplies power to the isolation sensor through the output monitoring and management unit. By setting the isolation power conversion unit, the power supply of the isolation sensor is effectively realized.

[0042] It should be noted that when the vehicle is left unattended for a long time, the low-voltage battery will gradually lose power. If it is not charged and maintained in time, it will affect the life of the low-voltage battery. The current practice is that when the vehicle detects that the low-voltage battery voltage is too low, the vehicle high voltage is powered on, and then the vehicle DCDC is started to charge the low-voltage battery. Although this method can meet the functional requirements, starting the vehicle DCDC will cause the high voltage of the vehicle to be powered on, and multiple controllers will be linked, which will increase the overall low-voltage power consumption, and the vehicle will produce abnormal noises due to the linkage of the vehicle (high-voltage relays, thermal management system fans, etc.). In order to solve the above problems, in some embodiments, Figure 1 Based on the structure of , the low-voltage output end of the high-low voltage power conversion unit will be further connected to the low-voltage battery charging port, that is, see Figure 2 When the low-voltage battery is feeding power, the power battery can be directly used to charge the low-voltage battery, and the high-voltage silent charging of the low-voltage battery can be started at any time, ensuring the stability of the low-voltage power supply of the vehicle when the vehicle is parked for a long time, and also ensuring that the energy consumption of the vehicle is minimized when it is parked for a long time.

[0043] It should be noted that in the existing power chassis domain, when the motor controller high-voltage circuit is powered off, in order to prevent the high-voltage charge stored in the capacitor in the circuit from endangering the vehicle maintenance personnel, it is necessary to start instant active discharge when the power is turned off, generally through components such as resistors or IGBTs to consume the power. This passive form of power consumption wastes energy on the one hand, and also generates a lot of heat on the other. In order to solve the above problems, in some embodiments, Figure 2 Based on the structure of the high-voltage side input end of the high-voltage and low-voltage power conversion unit, the high-voltage circuit of the motor controller will be connected externally, that is, see Figure 3 , VIN_H2 is the high voltage of the high voltage circuit of the motor controller. When the high voltage circuit of the motor controller is powered, the high voltage charge can be released through the high-low voltage power conversion unit, that is, the high voltage charge is converted into low voltage and stored in the low voltage battery, which greatly reduces the discharge energy consumption and reduces the heat caused by discharge.

[0044] It should be noted that the power battery needs to be pre-charged before the high voltage is powered on, specifically, the capacitor on the high voltage circuit of the motor controller is pre-charged. The traditional method is to pre-charge through a power-consuming resistor. Due to the heat generation of the resistor, the pre-charging time cannot be too short, and this time takes up the power-on time of the vehicle system. In the case of complex vehicle functions, the power-on time requirement for the power battery will be even shorter. The resistor pre-charging method is limited by heat generation and power, and the space that can be reduced is limited. In order to solve the above problems, in some embodiments, Figure 1 , 2 Based on the structure of 3, the low-voltage input end of the high-low voltage power conversion unit will be further connected to the low-voltage battery outlet, and the high-voltage output end of the high-low voltage power conversion unit will be connected to the high-voltage circuit of the motor controller. The specific structure can be found in Figure 4 ( Figure 4 is Figure 3 Before the power battery is powered on, the capacitor on the high-voltage circuit of the motor controller can be pre-charged directly through the low-voltage battery, saving the pre-charging time at the time of high-voltage power-on. At the same time, since the pre-charging belongs to the DCDC energy efficient energy conversion, it saves time and also reduces the heat and energy loss of the pre-charging.

[0045] It should be noted that in Figure 4 In the embodiment, the high-low voltage power conversion unit can be realized by using two step-down DCDC converters, one to reduce the voltage of the power battery to low voltage, and the other to increase the voltage of the low voltage battery to high voltage. Of course, the high-low voltage power conversion unit can also be realized by using a bidirectional DCDC converter.

[0046] Figure 5 It is a schematic diagram of an embodiment of a power supply method for a power chassis domain disclosed in the present invention, Figure 5 The embodiment can be executed by the power chassis domain master controller, and the method is based at least on Figure 1structure for power supply.

[0047] See also Figure 5 , step 1 of the embodiment, controls the high-low voltage power conversion unit to convert the high voltage output by the power battery into a first low voltage, and transmits the first low voltage to the redundant input switching unit.

[0048] In step 2 of the embodiment, the buck-boost power conversion unit is controlled to convert the second low voltage output by the low-voltage battery into a third low voltage, and the third low voltage is transmitted to the redundant input switching unit.

[0049] In step 3 of the embodiment, if it is detected that the first low voltage and / or the third low voltage is valid, the redundant input switching unit is controlled to select a valid low voltage output; wherein valid means that the voltage is a stable 12V voltage.

[0050] The method realizes redundant power supply by controlling the high- and low-voltage power conversion units, the buck-boost power conversion units and the redundant input switching units, and can also ensure stable power supply in the power chassis domain in the event of voltage fluctuations or failures in the low-voltage battery.

[0051] Figure 6 It is a schematic diagram of an embodiment of a low-voltage charging method for a power chassis domain disclosed in the present invention, Figure 6 The embodiment can be executed by the power chassis domain master controller, and the method can be based on Figure 2 The embodiment includes: if a low-voltage battery feed is detected, controlling the high-low voltage power conversion unit to convert the high voltage output by the power battery into a first low voltage, and transmitting the first low voltage to the low-voltage battery.

[0052] This method realizes charging of the low-voltage battery by the power battery by controlling the high- and low-voltage power conversion units. The high-voltage silent power replenishment of the low-voltage battery can be started at any time, ensuring the stability of the low-voltage power supply of the vehicle when the vehicle is parked for a long time, and also ensuring that the energy consumption of the vehicle is minimized when it is parked for a long time.

[0053] Figure 7 It is a schematic diagram of an embodiment of the active discharge method of the power chassis domain disclosed in the present invention, Figure 7 The embodiment can be executed by the power chassis domain master controller, and the method can be based on Figure 3 The embodiment includes: if it is detected that the high voltage circuit of the motor controller is powered off, controlling the high-low voltage power conversion unit to convert the high voltage output by the high voltage circuit of the motor controller into a first low voltage, and transmitting the first low voltage to the low voltage battery.

[0054] The method can release the high-voltage charge of the high-voltage circuit of the motor controller by controlling the high-low voltage power conversion unit, that is, converting the high-voltage charge into low voltage and storing it in the low-voltage battery, which greatly reduces the discharge energy consumption and reduces the heat caused by discharge.

[0055] Figure 8 It is a schematic diagram of an embodiment of a high-voltage pre-charging method for a power chassis domain disclosed in the present invention, Figure 8 The embodiment can be executed by the power chassis domain master controller, and the method can be based on Figure 4 The embodiment includes: if the pre-charging before the power battery is powered on is detected, the high-low voltage power conversion unit is controlled to convert the second low voltage output by the low voltage battery into a high voltage, and the high voltage is transmitted to the high voltage circuit of the motor controller to charge the capacitor on the high voltage circuit of the motor controller.

[0056] The method realizes high-voltage pre-charging by controlling the high- and low-voltage power conversion units, and can directly pre-charge the capacitor on the high-voltage circuit of the motor controller through the low-voltage battery, saving the pre-charging time at the time of high-voltage power-on. At the same time, since the pre-charging belongs to the DCDC energy efficient energy conversion, it saves time and also reduces the heat generation and energy loss of the pre-charging.

[0057] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A power supply system for a power chassis domain, characterized in that: It includes a high-low voltage power conversion unit, a buck-boost power conversion unit, a redundant input switching unit, and an output monitoring and management unit; The high-voltage side input end of the high-low voltage power conversion unit is externally connected to the power battery outlet, and the low-voltage side output end of the high-low voltage power conversion unit is connected to the first input end of the redundant input switching unit; The input end of the buck-boost power conversion unit is externally connected to the low-voltage battery outlet, and the output end of the buck-boost power conversion unit is connected to the second input end of the redundant input switching unit; The redundant input switching unit selects a valid input as the output, and the output of the redundant input switching unit supplies power to each controller in the power chassis domain through the output monitoring and management unit; wherein, the output monitoring and management unit monitors the power consumption of each controller, and in the event of a power failure, cuts off and isolates the power supply to the faulty controller.

2. The system according to claim 1, characterized in that The low voltage side output end of the high and low voltage power conversion unit is also externally connected to a low voltage battery charging port.

3. The system according to claim 2, characterized in that The high voltage side input end of the high and low voltage power conversion unit is also externally connected to the high voltage circuit of the motor controller.

4. The system according to any one of claims 1 to 3, characterized in that: The low voltage side input end of the high and low voltage power conversion unit is externally connected to the low voltage battery outlet, and the high voltage side output end of the high and low voltage power conversion unit is externally connected to the high voltage circuit of the motor controller.

5. The system according to claim 1, characterized in that If there is an isolation sensor at the positive or negative pole of the power battery, an isolation power conversion unit is also connected in parallel on the line between the redundant input switching unit and the output monitoring and management unit, and the output of the isolation power conversion unit supplies power to the isolation sensor through the output monitoring and management unit.

6. The system according to claim 1 or 5, characterized in that: All power conversion units are DCDC converters.

7. A power supply method for a power chassis domain, characterized in that: The system according to any one of claims 1 to 6 is used for power supply, and the method comprises: Controlling the high-low voltage power conversion unit to convert the high voltage output by the power battery into a first low voltage, and transmitting the first low voltage to the redundant input switching unit; Controlling the buck-boost power conversion unit to convert the second low voltage output by the low-voltage battery into a third low voltage, and transmitting the third low voltage to the redundant input switching unit; If it is detected that the first low voltage and / or the third low voltage is valid, the redundant input switching unit is controlled to select the valid low voltage output.

8. A low-voltage charging method for a power chassis domain, characterized in that: The system of claim 2 is used for low voltage charging, the method comprising: If power feeding from a low-voltage battery is detected, the high-low voltage power conversion unit is controlled to convert the high voltage output by the power battery into a first low voltage, and the first low voltage is transmitted to the low-voltage battery.

9. An active discharge method for a power chassis domain, characterized in that: Active discharge is performed using the system of claim 3, the method comprising: If it is detected that the high voltage circuit of the motor controller is powered off, the high-low voltage power conversion unit is controlled to convert the high voltage output by the high voltage circuit of the motor controller into a first low voltage, and the first low voltage is transmitted to the low voltage battery.

10. A high-voltage pre-charging method for a power chassis domain, characterized in that: The system of claim 4 is used for high-pressure precharging, the method comprising: If pre-charging before triggering the power battery to power on is detected, the high-low voltage power conversion unit is controlled to convert the second low voltage output by the low-voltage battery into a high voltage, and the high voltage is transmitted to the high-voltage circuit of the motor controller to charge the capacitor on the high-voltage circuit of the motor controller.

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