High-voltage pre-charging circuit and method, high-voltage circuit, vehicle, medium and program product

Abstract

The invention relates to a high-voltage pre-charge circuit and method, a high-voltage circuit, a vehicle, a medium and a program product. The high-voltage pre-charging circuit comprises a high-voltage battery, a pre-charging device and an energy storage device, the pre-charging device is respectively connected with the high-voltage battery and the energy storage device, and is used for pre-charging the energy storage device by using the electric energy of the high-voltage battery when receiving a power-on request, so that the voltage of the energy storage device reaches a target voltage, and the target voltage is determined according to the voltage of the high-voltage battery. Therefore, on one hand, a pre-charging relay and a pre-charging resistor do not need to be arranged in the high-voltage battery, and on the other hand, the electric energy of the high-voltage battery is utilized to pre-charge the energy storage device, so that the load of the low-voltage storage battery is reduced, and the service life of the low-voltage storage battery is further prolonged.

Description

Technical Field

[0001] The present disclosure relates to the field of vehicle technology, and in particular to a high-voltage precharging circuit and method, a high-voltage circuit, a vehicle, a medium, and a program product. Background Art

[0002] New energy vehicles such as pure electric, hybrid, and plug-in hybrid vehicles are equipped with high-voltage batteries and corresponding high-voltage electrical equipment. High-voltage electrical equipment generally has a large capacitance at the high-voltage port and cannot be directly connected to the high-voltage battery, otherwise it will generate a large pulse current and damage the components.

[0003] In order to prevent the problem of component damage caused by large pulse current when high voltage is powered on, it is usually necessary to pre-charge the capacitor before high voltage is powered on so that the voltage across the capacitor matches the high voltage battery. In this way, when the main relay switch is closed and the high voltage is on, large pulse current can be avoided, thereby avoiding damage to components. Summary of the invention

[0004] To overcome the problems existing in the related art, the present disclosure provides a high-voltage pre-charging circuit and method, a high-voltage circuit, a vehicle, a medium and a program product.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a high-voltage pre-charging circuit, the high-voltage pre-charging circuit comprising: a high-voltage battery, a pre-charging device and an energy storage device; The pre-charging device is connected to the high-voltage battery and the energy storage device respectively, and is used to use the electric energy of the high-voltage battery to pre-charge the energy storage device when a power-on request is received, so that the voltage of the energy storage device reaches a target voltage, and the target voltage is determined according to the voltage of the high-voltage battery.

[0006] Optionally, the pre-charging device includes a first voltage conversion unit and a second voltage conversion unit: The first voltage conversion unit is connected to the high-voltage battery and the second voltage conversion unit respectively, and is used to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery, and the second voltage is lower than the first voltage; The second voltage conversion unit is connected to the energy storage device, and is used to output a charging current to the energy storage device when receiving the first voltage, so as to pre-charge the energy storage device.

[0007] Optionally, the first voltage conversion unit includes a plurality of output branches, and the plurality of output branches includes at least one target output branch connected to the second voltage conversion unit; the high-voltage pre-charging circuit further includes a control device; The control device is connected to the first voltage conversion unit, and is used to control the target output branch in the first voltage conversion unit to close and control other output branches except the target output branch to open, so as to output a second voltage to the second voltage conversion unit through the target output branch.

[0008] Optionally, the control device is further used to control the first voltage conversion unit to operate in a BUCK mode after controlling other output branches except the target output branch to be disconnected, so that the first voltage conversion unit converts the first voltage into the second voltage.

[0009] Optionally, the first voltage conversion unit is a flyback converter, a first end of the flyback converter is connected to the positive terminal of the high-voltage battery, and a second end of the flyback converter is connected to the negative terminal of the high-voltage battery.

[0010] Optionally, the control device is further used to control the second voltage conversion unit to operate in a BOOST mode after the first voltage conversion unit operates in a BUCK mode, so that the second voltage conversion unit outputs a charging current to the energy storage device when receiving the first voltage.

[0011] Optionally, the second voltage conversion device is a DC-DC converter.

[0012] Optionally, the energy storage device is a capacitor.

[0013] According to a second aspect of an embodiment of the present disclosure, a high voltage circuit is provided, the high voltage circuit comprising: a switch component and the high voltage pre-charging circuit according to the first aspect of an embodiment of the present disclosure; The switch assembly is located between the high-voltage battery and the energy storage device, and is configured to be in an open state when the pre-charging device pre-charges the energy storage device, and to be in a closed state after the pre-charging is completed.

[0014] Optionally, the switch assembly includes a first switch and a second switch; The first switch is located between the first end of the high-voltage battery and the first end of the energy storage device; The second switch is located between the second end of the high-voltage battery and the second end of the energy storage device; The first switch and the second switch are in an open state when the pre-charging device pre-charges the energy storage device, and are in a closed state after the pre-charging is completed.

[0015] According to a third aspect of an embodiment of the present disclosure, a high-voltage precharging method is provided, the method being applied to the high-voltage precharging circuit as described in the first aspect of an embodiment of the present disclosure, the method comprising: confirming that a power-on request is received; The pre-charging device is controlled to pre-charge the energy storage device using the electric energy of the high-voltage battery so that the voltage of the energy storage device reaches a target voltage, and the target voltage is determined according to the voltage of the high-voltage battery.

[0016] Optionally, the pre-charging device includes a first voltage conversion unit and a second voltage conversion unit; The controlling the pre-charging device to pre-charge the energy storage device using the electric energy of the high-voltage battery comprises: Controlling the first voltage conversion unit to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery, wherein the second voltage is lower than the first voltage; The second voltage conversion unit is controlled to output a charging current to the energy storage device when receiving the first voltage, so as to pre-charge the energy storage device.

[0017] Optionally, the first voltage conversion unit includes a plurality of output branches, and the plurality of output branches include at least one target output branch connected to the second voltage conversion unit; and the controlling the first voltage conversion unit to output the second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery comprises: The output branches other than the target output branch in the first voltage conversion unit are controlled to be disconnected, and the target output branch is controlled to be closed, so as to output a second voltage to the second voltage conversion unit through the target output branch.

[0018] Optionally, the controlling the first voltage conversion unit to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery further includes: After controlling the output branches other than the target output branch to be disconnected, controlling the first voltage conversion unit to operate in a BUCK mode, so that the first voltage conversion unit converts the first voltage into the second voltage; A second voltage is output to the second voltage conversion unit.

[0019] Optionally, controlling the second voltage conversion unit to output a charging current to the energy storage device when receiving the first voltage includes: After the first voltage conversion unit operates in the BUCK mode, the second voltage conversion unit is controlled to operate in the BOOST mode, so that the second voltage conversion unit outputs a charging current to the energy storage device when receiving the first voltage.

[0020] Optionally, the method further comprises: If the voltage of the energy storage device does not reach the target voltage after the pre-charging preset time, a pre-charging fault prompt message is output.

[0021] According to a fourth aspect of an embodiment of the present disclosure, a vehicle is provided, comprising: processor; a memory for storing processor-executable instructions; The high voltage circuit according to the second aspect of the embodiment of the present disclosure; Among them, the processor is configured to execute the instructions to implement the steps of the high-voltage pre-charging method described in the third aspect of the embodiment of the present disclosure.

[0022] According to a fifth aspect of an embodiment of the present disclosure, a computer-readable storage medium is provided, on which computer program instructions are stored. When the program instructions are executed by a processor, the steps of the high-voltage pre-charging method described in the third aspect of an embodiment of the present disclosure are implemented.

[0023] According to a sixth aspect of an embodiment of the present disclosure, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the steps of the high-voltage pre-charging method described in the third aspect of an embodiment of the present disclosure.

[0024] With the above technical solution, the pre-charging device is connected to the high-voltage battery and the energy storage device respectively, and is used to pre-charge the energy storage device with the electric energy of the high-voltage battery when receiving a power-on request, so that the voltage of the energy storage device reaches the target voltage. In this way, on the one hand, there is no need to set a pre-charging relay and a pre-charging resistor in the high-voltage battery, and on the other hand, the electric energy of the high-voltage battery is used to pre-charge the energy storage device, which reduces the load of the low-voltage battery and thus prolongs the service life of the low-voltage battery.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0027] Figure 1 It is a block diagram of a pre-charging circuit in the related art.

[0028] Figure 2 is a block diagram of a high voltage circuit according to an exemplary embodiment.

[0029] Figure 3 is a block diagram of a high-voltage pre-charging circuit according to an exemplary embodiment.

[0030] Figure 4 is a schematic diagram of a high voltage circuit according to an exemplary embodiment.

[0031] Figure 5 is a waveform diagram of a charging current according to an exemplary embodiment.

[0032] Figure 6 The figure is a flow chart of a high-voltage pre-charging method according to an exemplary embodiment.

[0033] Figure 7 The figure is a flow chart showing a high voltage power-on process according to an exemplary embodiment.

[0034] Figure 8 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0035] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0036] It should be noted that all actions of acquiring signals, information or data in the present disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the device is located and with the authorization given by the owner of the corresponding device.

[0037] In the related art, in order to pre-charge the capacitor, it is usually necessary to additionally set up a pre-charging circuit to pre-charge the capacitor. Figure 1 FIG. 1 is a block diagram of a pre-charging circuit in the related art. Figure 1 As shown, the anti-backflow circuit is arranged in a DC-DC converter, the DC-DC converter is respectively connected to a low-voltage battery, a high-voltage battery and a high-voltage electrical equipment, and the DC-DC converter uses the electric energy of the low-voltage battery for pre-charging.

[0038] However, this method will increase the load on the low-voltage battery, have a significant impact on the life of the low-voltage battery, and reduce the service life of the low-voltage battery, especially the service life of the lead-acid battery, thereby resulting in a poor driving experience for users.

[0039] In view of this, the present disclosure provides a high-voltage pre-charging circuit and method, a high-voltage circuit, a vehicle, a medium and a program product. The pre-charging device can use the electric energy of the high-voltage battery to pre-charge the energy storage device, so that the voltage of the energy storage device reaches the target voltage, avoiding the generation of a large pulse current when the high voltage is powered on. In this way, on the one hand, there is no need to set a pre-charging relay and a pre-charging resistor in the high-voltage battery, and on the other hand, the electric energy of the high-voltage battery is used to pre-charge the energy storage device, which reduces the load of the low-voltage battery and thus prolongs the service life of the low-voltage battery.

[0040] Figure 2 is a block diagram of a high voltage circuit according to an exemplary embodiment. Figure 3 is a block diagram of a high voltage pre-charging circuit according to an exemplary embodiment. Figure 2 and Figure 3 The high voltage circuit may include a high voltage pre-charging circuit 100 and a switch assembly 200 . The high voltage pre-charging circuit 100 may include a high voltage battery 101 , a pre-charging device 102 and an energy storage device 103 .

[0041] The pre-charging device 102 is respectively connected to the high-voltage battery 101 and the energy storage device 103, and is used to pre-charge the energy storage device 103 using the electric energy of the high-voltage battery 101 when a power-on request is received, so that the voltage of the energy storage device 103 reaches the target voltage. The target voltage is determined according to the voltage of the high-voltage battery. For example, the target voltage can be the difference between the voltage of the high-voltage battery and the preset value. For example, the voltage of the high-voltage battery is 400V, the preset value can be 10V, and the target voltage can be 390V. In this way, it can be ensured that the voltage across the energy storage device 103 matches the voltage of the high-voltage battery after pre-charging, and when the switch assembly is closed to apply high voltage, since the voltage across the energy storage device 103 matches the voltage of the high-voltage battery, it is possible to avoid the generation of large pulse currents.

[0042] The power-on request may be a high-voltage power-on request, which may include but is not limited to: a request for high voltage during driving, a request for high voltage during charging, a request for high voltage during remote operation, and a request for high voltage in other scenarios.

[0043] It should be understood that since the battery has positive and negative poles, Figure 2 and Figure 3 In the process, the high-voltage battery and the pre-charging device are connected by two wires. Similarly, during the pre-charging process, the circuit is a loop, so the pre-charging device and the energy storage device are also connected by two wires.

[0044] In one implementation, after receiving a power-on request, the pre-charging device 102 directly uses the electric energy of the high-voltage battery 101 to pre-charge the energy storage device 103 .

[0045] In another embodiment, considering that a safety accident may occur when the high voltage is applied when a vehicle fails, in this embodiment, in order to ensure the safety of power-on, after receiving the power-on request, it is further determined whether the vehicle meets the high voltage conditions, and if the high voltage conditions are met, the high voltage process is entered. Among them, the high voltage process may include: the pre-charging device 102 uses the electric energy of the high-voltage battery 101 to pre-charge the energy storage device 103, and applies high voltage after the pre-charging is completed. That is, after the pre-charging is completed, the control switch assembly 200 is closed, and the high-voltage battery 101 is used to power the energy storage device 103 or the high-voltage electrical equipment. Among them, the high voltage condition can be the absence of the following faults: insulation fault, interlocking fault, communication fault, fault of each high-voltage component, and other faults that prohibit the application of high voltage. In this way, the safety of applying high voltage is improved.

[0046] If it is determined that the vehicle does not meet the high voltage condition, the power-on process is exited, that is, the energy storage device 103 is not pre-charged. For example, when it is determined that the vehicle does not meet the high voltage condition, a prompt message can also be output to prompt the driver that the vehicle fails and cannot be powered on.

[0047] Reference Figure 2 The switch assembly 200 is located between the high-voltage battery 101 and the energy storage device 103, and is used to be in an open state when the pre-charging device 102 pre-charges the energy storage device 103, and is in a closed state after the pre-charging is completed.

[0048] In this way, during the pre-charging process, the switch assembly 200 is in the disconnected state, and the electric energy of the high-voltage battery 101 is converted by the pre-charging device 102 to the energy storage device 103 for pre-charging. After the pre-charging is completed, the voltage of the energy storage device 103 reaches the target voltage, and then the high voltage on the switch assembly 200 is closed. At this time, since the voltage of the energy storage device 103 is not much different from that of the high-voltage battery 101, when the switch assembly 200 is closed, no large pulse current will be generated, and the purpose of protecting components can be achieved.

[0049] With the above technical solution, the pre-charging device is connected to the high-voltage battery and the energy storage device respectively, and is used to pre-charge the energy storage device with the electric energy of the high-voltage battery when receiving a power-on request, so that the voltage of the energy storage device reaches the target voltage. In this way, on the one hand, there is no need to set a pre-charging relay and a pre-charging resistor in the high-voltage battery, and on the other hand, the electric energy of the high-voltage battery is used to pre-charge the energy storage device, which reduces the load of the low-voltage battery and thus prolongs the service life of the low-voltage battery.

[0050] In one embodiment, the pre-charging device 102 may include a first voltage conversion unit 1021 and a second voltage conversion unit 1022. The first voltage conversion unit 1021 is connected to the high-voltage battery 101 and the second voltage conversion unit 1022, respectively, and is configured to output a second voltage to the second voltage conversion unit 1022 when receiving a first voltage output by the high-voltage battery 101, wherein the second voltage is lower than the first voltage.

[0051] like Figure 4 As shown, the first end of the first voltage conversion unit 1022 is connected to the positive terminal of the high-voltage battery 101, and the second end of the first voltage conversion unit 1022 is connected to the negative terminal of the high-voltage battery 101. By way of example, the first voltage conversion unit 1022 may be a flyback converter, the first end of the flyback converter is connected to the positive terminal of the high-voltage battery 101, and the second end of the flyback converter is connected to the negative terminal of the high-voltage battery 101.

[0052] In one embodiment, the first voltage conversion unit 1022 may include a plurality of output branches, wherein the plurality of output branches include at least one target output branch connected to the second voltage conversion unit 1022. Accordingly, the high voltage pre-charging circuit 100 may further include a control device. The control device is connected to the first voltage conversion unit 1021, and is used to control the closing of the target output branch in the first voltage conversion unit 1021 and to control the disconnection of other output branches except the target output branch, so as to output the second voltage to the second voltage conversion unit through the target output branch.

[0053] Since each output branch is connected to a different load, when each output branch is closed, the electric energy of the high-voltage battery 101 is used not only to charge the energy storage device 103, but also to power other loads, which may result in low pre-charging efficiency. Therefore, in this embodiment, the control device can control the target output branch in the first voltage conversion unit 1021 to close and control other output branches except the target output branch to be disconnected, so as to utilize all the electric energy of the high-voltage battery 101 to power the energy storage device 103.

[0054] For example, when receiving a power-on request, the control device may send an instruction to the first voltage conversion unit 1021 to discard the loads of other output branches, so as to control the output branches other than the target output branch to be disconnected.

[0055] In addition, the control device is further used to control the first voltage conversion unit to operate in the BUCK mode after controlling the output branches other than the target output branch to be disconnected, so that the first voltage conversion unit 1021 converts the first voltage into the second voltage.

[0056] Among them, the first voltage conversion unit 1021 can convert high voltage into low voltage when working in BUCK mode. Therefore, in addition to discarding other output branch loads, the control device can also control the first voltage conversion unit 1021 to work in BUCK mode to convert the first voltage into a second voltage.

[0057] In one embodiment, the control device is further used to control the second voltage conversion unit 1022 to operate in the BOOST mode after the first voltage conversion unit 1021 operates in the BUCK mode, so that the second voltage conversion unit 1022 outputs a charging current to the energy storage device when receiving the first voltage. The second voltage conversion unit 1022 can convert a low voltage into a high voltage when operating in the BOOST mode.

[0058] like Figure 4 As shown, the input end of the second voltage conversion unit 1022 is connected to the output end of the first voltage conversion unit 1021, the first output end of the second voltage conversion unit 1022 is connected to the first end of the energy storage device 103, and the second output end of the second voltage conversion unit 1022 is connected to the second end of the energy storage device 103. In this way, the second voltage conversion unit 1022 outputs a charging current to the energy storage device 103 when receiving the first voltage in the BOOST mode.

[0059] For example, the positive terminal of the second voltage conversion unit 1022 is connected to the positive terminal of the energy storage device 103 , and the negative terminal of the second voltage conversion unit 1022 is connected to the negative terminal of the energy storage device 103 .

[0060] The second voltage conversion unit 1022 can be a direct current-to-direct current DC-DC converter. The DC-DC converter can convert a low level into a high level. In addition, the DC-DC converter can control the low-voltage side current of the DC-DC converter when operating in BOOST mode. For example, after the DC-DC converter enters the BOOST mode, the charging current can be controlled at different stages based on the current ambient temperature and the maximum output capacity limit of the first voltage conversion unit 1021. Among them, the technology for controlling the charging current based on the current ambient temperature and the maximum output capacity limit of the first voltage conversion unit 1021 belongs to a relatively mature technology of the DC-DC converter, and the present disclosure does not make specific limitations on this.

[0061] Figure 5 FIG. 1 is a waveform diagram of a charging current according to an exemplary embodiment. Figure 5As shown, in the first stage, the DC-DC converter can output the charging current according to curve A, so that the charging current slowly increases to the maximum value, and when the charging current reaches the maximum value, the charging current remains unchanged for a period of time, so as to charge the energy storage device 103 during the period of time and increase the voltage across the energy storage device 103. Finally, after the voltage of the energy storage device 103 reaches the target voltage, in order to avoid directly reducing the charging current and generating a large instantaneous current, after the voltage of the energy storage device 103 reaches the target voltage, the charging current can be slowly reduced to zero according to curve B.

[0062] It should be understood that the circuit structure of the DC-DC converter and the working principle of the DC-DC converter are both relatively mature technologies in the relevant technology, and the present disclosure does not make specific limitations on this.

[0063] In addition, if Figure 4 As shown, the energy storage device 103 can be a capacitor C1, the positive terminal of the capacitor C1 is connected to the positive electrode of the high-voltage battery 101 through the switch component 200, and the negative terminal of the capacitor C1 is connected to the negative electrode of the high-voltage battery 101 through the switch component 200.

[0064] like Figure 4 As shown, the switch assembly 200 may include a first switch S1 and a second switch S2. The first switch S1 is located between the first end of the high-voltage battery 101 and the first end of the energy storage device 103, and the second switch S2 is located between the second end of the high-voltage battery 101 and the second end of the energy storage device 103. By way of example, the first end is a positive end, and the second end is a negative end, that is, the first switch S1 may be a main positive switch, and the second switch S2 may be a main negative switch.

[0065] The first switch S1 and the second switch S2 are in an open state when the pre-charging device 102 pre-charges the energy storage device 103 , and are in a closed state after the pre-charging is completed.

[0066] For example, the pre-charging ends when the voltage of the energy storage device 103 reaches the target voltage, that is, the pre-charging is completed when the voltage of the energy storage device 103 reaches the target voltage.

[0067] In this way, during the pre-charging process, the first switch S1 and the second switch S2 are both in the disconnected state, and the electric energy of the high-voltage battery 101 is converted by the pre-charging device 102 to pre-charge the energy storage device 103. After the pre-charging is completed, the voltage of the energy storage device 103 reaches the target voltage, and then the first switch S1 and the second switch S2 are closed. At this time, since the voltage of the energy storage device 103 is not much different from that of the high-voltage battery 101, when the switch assembly 200 is closed, no large pulse current will be generated, and the purpose of protecting components can be achieved.

[0068] Based on the same inventive concept, the present disclosure also provides a high-voltage pre-charging method. Figure 6 FIG. 1 is a flow chart of a high-voltage pre-charging method according to an exemplary embodiment. The high-voltage pre-charging method can be applied to the high-voltage pre-charging circuit provided in the present disclosure. Figure 6 As shown, the high-voltage pre-charging method may include the following steps.

[0069] In step S61 , it is determined that a power-on request is received.

[0070] In step S62, the pre-charging device is controlled to pre-charge the energy storage device using the electric energy of the high-voltage battery so that the voltage of the energy storage device reaches the target voltage.

[0071] Among them, the target voltage is determined according to the voltage of the high-voltage battery.

[0072] With the above technical solution, the pre-charging device is connected to the high-voltage battery and the energy storage device respectively, and is used to pre-charge the energy storage device with the electric energy of the high-voltage battery when receiving a power-on request, so that the voltage of the energy storage device reaches the target voltage. In this way, on the one hand, there is no need to set a pre-charging relay and a pre-charging resistor in the high-voltage battery, and on the other hand, the electric energy of the high-voltage battery is used to pre-charge the energy storage device, which reduces the load of the low-voltage battery and thus prolongs the service life of the low-voltage battery.

[0073] Optionally, the pre-charging device includes a first voltage conversion unit and a second voltage conversion unit; The controlling the pre-charging device to pre-charge the energy storage device using the electric energy of the high-voltage battery comprises: Controlling the first voltage conversion unit to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery, wherein the second voltage is lower than the first voltage; The second voltage conversion unit is controlled to output a charging current to the energy storage device when receiving the first voltage, so as to pre-charge the energy storage device.

[0074] Optionally, the first voltage conversion unit includes a plurality of output branches, and the plurality of output branches include at least one target output branch connected to the second voltage conversion unit; and the controlling the first voltage conversion unit to output the second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery comprises: The output branches other than the target output branch in the first voltage conversion unit are controlled to be disconnected, and the target output branch is controlled to be closed, so as to output a second voltage to the second voltage conversion unit through the target output branch.

[0075] Optionally, the controlling the first voltage conversion unit to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery further includes: After controlling the output branches other than the target output branch to be disconnected, controlling the first voltage conversion unit to operate in a BUCK mode, so that the first voltage conversion unit converts the first voltage into the second voltage; A second voltage is output to the second voltage conversion unit.

[0076] Optionally, controlling the second voltage conversion unit to output a charging current to the energy storage device when receiving the first voltage includes: After the first voltage conversion unit operates in the BUCK mode, the second voltage conversion unit is controlled to operate in the BOOST mode, so that the second voltage conversion unit outputs a charging current to the energy storage device when receiving the first voltage.

[0077] Optionally, the method further comprises: If the voltage of the energy storage device does not reach the target voltage after a preset time, a pre-charging fault prompt message is output.

[0078] In order to facilitate those skilled in the art to better understand the high-voltage pre-charging method provided by the present disclosure, the method is described below with a complete embodiment.

[0079] Figure 7 is a flowchart of a high voltage power-on method according to an exemplary embodiment. The high voltage power-on method can be applied to Figure 4 The high voltage circuit shown. Figure 7 As shown, the high voltage power-up method may include the following steps.

[0080] In step S71, power on initialization.

[0081] In step S72, it is determined whether an upper high voltage request is received. For example, if it is determined that the vehicle has an upper high voltage demand, it is determined that the upper high voltage request is received, and if it is determined that the vehicle does not have an upper high voltage demand, it is determined that the upper high voltage request is not received. If the upper high voltage request is received, the following step S73 is executed, otherwise step S72 is repeated.

[0082] In step S73, it is determined whether the upper high pressure condition is met. If it is determined that the upper high pressure condition is met, the following step S75 is executed, otherwise, step S74 is executed.

[0083] Among them, the upper high pressure condition has been described above and will not be repeated here.

[0084] In step S74, power-on is terminated.

[0085] In step S75, a load dump control instruction and an instruction to operate in the BUCK mode are sent to the Flyback converter.

[0086] The load dump control instruction is an instruction for controlling the closing of a target output branch connected to the second voltage conversion unit and controlling the disconnection of output branches other than the target output branch.

[0087] In step S76, it is determined whether the Flyback converter has completed the load dumping and is working in the BUCK mode. If so, step S77 is executed, otherwise, the process returns to step S76.

[0088] In step S77, the DC-DC converter is controlled to operate in the BOOST mode.

[0089] The DC-DC converter is controlled to work in BOOST mode to pre-charge the capacitor.

[0090] In step S78, it is detected whether the voltage across the capacitor reaches the target voltage. If it reaches the target voltage, steps S79 to S711 are executed, otherwise, step S712 is executed.

[0091] In step S79 , the first switch S1 and the second switch S2 are closed.

[0092] In step S710 , the Flyback converter is controlled to exit the BUCK mode, and the DC-DC converter is controlled to enter the BUCK mode.

[0093] In addition, after step S710, the states of the current relays, namely the first switch S1 and the second switch S2, and the high-voltage state detected by the detection module in the high-voltage battery can also be fed back to determine whether the high voltage is successfully applied.

[0094] In step S711, the high voltage is completed.

[0095] In step S712, it is determined whether the duration of pre-charging exceeds a preset duration. If it does not exceed the preset duration, step 78 is repeated, otherwise step S74 is executed to end the power-on.

[0096] By adopting the above technical solution, during the pre-charging process, the high-voltage battery is used to pre-charge the capacitor, and there is no need to use the low-voltage battery for pre-charging, which reduces the load of the low-voltage battery and thus extends the service life of the low-voltage battery.

[0097] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, and the program instructions, when executed by a processor, implement the steps of the high-voltage pre-charging method provided by the present disclosure.

[0098] The present disclosure also provides a computer program product, including a computer program, which implements the steps of the high-voltage pre-charging method provided by the present disclosure when executed by a processor.

[0099] The present disclosure also provides a vehicle, comprising: a processor; a memory for storing processor-executable instructions; The high voltage circuit provided by the present disclosure; Among them, the processor is configured to execute the instructions to implement the steps of the high-voltage pre-charging method provided by the present disclosure.

[0100] Figure 8 800 is a block diagram of a vehicle according to an exemplary embodiment. For example, vehicle 800 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. Vehicle 800 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle.

[0101] Reference Figure 8 , the vehicle 800 may include various subsystems, for example, an infotainment system 810, a perception system 820, a decision control system 830, a drive system 840, and a computing platform 850. The vehicle 800 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 800 may be interconnected by wire or wireless means.

[0102] In some embodiments, the infotainment system 810 may include a communication system, an entertainment system, and a navigation system, etc.

[0103] The perception system 820 may include several sensors for sensing information about the environment around the vehicle 800. For example, the perception system 820 may include a global positioning system (the global positioning system may be a GPS system, or a Beidou system or other positioning systems), an inertial measurement unit (IMU), a laser radar, a millimeter wave radar, an ultrasonic radar, and a camera.

[0104] The decision control system 830 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0105] The drive system 840 may include components that provide powered motion for the vehicle 800. In one embodiment, the drive system 840 may include an engine, an energy source, a transmission system, and wheels. The engine may be one or a combination of an internal combustion engine, an electric motor, and an air compression engine. The engine is capable of converting energy provided by the energy source into mechanical energy.

[0106] Some or all functions of the vehicle 800 are controlled by a computing platform 850. The computing platform 850 may include at least one processor 851 and a memory 852, and the processor 851 may execute instructions 853 stored in the memory 852.

[0107] The processor 851 may be any conventional processor, such as a commercially available CPU. The processor may also include a graphics processor (Graphic Process Unit, GPU), a field programmable gate array (Field Programmable Gate Array, FPGA), a system on chip (System on Chip, SOC), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC) or a combination thereof.

[0108] The memory 852 may be implemented by any type of volatile or nonvolatile memory device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0109] In addition to instructions 853 , memory 852 may also store data, such as road maps, route information, vehicle location, direction, speed, etc. The data stored in memory 852 may be used by computing platform 850 .

[0110] In the embodiment of the present disclosure, the processor 851 may execute instruction 853 to complete all or part of the steps of the above-mentioned high-voltage pre-charging method.

[0111] In another exemplary embodiment, a computer program product is further provided. The computer program product includes a computer program executable by a programmable device. The computer program has a code portion for executing the above-mentioned high-voltage pre-charging method when executed by the programmable device.

[0112] In addition, the word "exemplary" is used herein to indicate serving as an example, instance, or diagram. Any aspect or design described as "exemplary" in this article is not necessarily understood to be advantageous compared to other aspects or designs. On the contrary, the use of the word exemplary is intended to present concepts in a specific way. As used herein, the term "or" is intended to represent an inclusive "or" rather than an exclusive "or". That is, unless otherwise specified or clear from the context, "X applies A or B" is intended to represent any one of the natural inclusive arrangements. That is, if X applies A; X applies B; or X applies both A and B, "X applies A or B" is satisfied under any of the aforementioned examples. In addition, unless otherwise specified or clearly pointed to a singular form from the context, the articles "one" and "an" as used in this application and the appended claims are generally understood to mean "one or more".

[0113] Likewise, although the present disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art after reading and understanding the specification and drawings. The present disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components (e.g., elements, resources, etc.) described above, unless otherwise indicated, the terms used to describe such components are intended to correspond to any component (functionally equivalent) that performs the specific functions of the described components, even if the structure is not equivalent to the disclosed structure. In addition, although specific features of the present disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations as may be desired and conducive to any given or specific application. In addition, with respect to "including", "having", "having", "having", or variations thereof used in a specific embodiment or claim, such terms are intended to be inclusive in a manner similar to the term "comprising".

[0114] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

[0115] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A high voltage precharge circuit, characterized in that: The high-voltage pre-charging circuit comprises: a high-voltage battery, a pre-charging device and an energy storage device; The pre-charging device is connected to the high-voltage battery and the energy storage device respectively, and is used to use the electric energy of the high-voltage battery to pre-charge the energy storage device when a power-on request is received, so that the voltage of the energy storage device reaches a target voltage, and the target voltage is determined according to the voltage of the high-voltage battery.

2. High voltage precharge circuit according to claim 1, characterized in that, The pre-charging device comprises a first voltage conversion unit and a second voltage conversion unit: The first voltage conversion unit is connected to the high-voltage battery and the second voltage conversion unit respectively, and is used to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery, and the second voltage is lower than the first voltage; The second voltage conversion unit is connected to the energy storage device, and is used to output a charging current to the energy storage device when receiving the first voltage, so as to pre-charge the energy storage device.

3. High voltage precharge circuit according to claim 2, characterized in that, The first voltage conversion unit includes a plurality of output branches, and the plurality of output branches includes at least one target output branch connected to the second voltage conversion unit; the high-voltage pre-charging circuit also includes a control device; The control device is connected to the first voltage conversion unit, and is used to control the target output branch in the first voltage conversion unit to close and control other output branches except the target output branch to open, so as to output a second voltage to the second voltage conversion unit through the target output branch.

4. High voltage precharge circuit according to claim 3, characterized in that, The control device is further used to control the first voltage conversion unit to operate in a BUCK mode after controlling other output branches except the target output branch to be disconnected, so that the first voltage conversion unit converts the first voltage into the second voltage.

5. according to the high voltage pre-charge circuit described in any one of claim 2-4, it is characterized in that, The first voltage conversion unit is a flyback converter, a first end of the flyback converter is connected to the positive terminal of the high-voltage battery, and a second end of the flyback converter is connected to the negative terminal of the high-voltage battery.

6. High voltage precharge circuit according to claim 4, characterized in that, The control device is further used to control the second voltage conversion unit to operate in the BOOST mode after the first voltage conversion unit operates in the BUCK mode, so that the second voltage conversion unit outputs a charging current to the energy storage device when receiving the first voltage.

7. The high voltage precharge circuit according to claim 6, wherein The second voltage conversion device is a DC-DC converter.

8. High voltage precharge circuit according to claim 1, characterized in that, The energy storage device is a capacitor.

9. A high voltage circuit, characterized in that: The high-voltage circuit comprises: a switch component and a high-voltage pre-charging circuit as claimed in any one of claims 1 to 8; The switch assembly is located between the high-voltage battery and the energy storage device, and is configured to be in an open state when the pre-charging device pre-charges the energy storage device, and to be in a closed state after the pre-charging is completed.

10. The high voltage circuit according to claim 9, characterized in that: The switch assembly includes a first switch and a second switch; The first switch is located between the first end of the high-voltage battery and the first end of the energy storage device; The second switch is located between the second end of the high-voltage battery and the second end of the energy storage device; The first switch and the second switch are in an open state when the pre-charging device pre-charges the energy storage device, and are in a closed state after the pre-charging is completed.

11. A high-voltage pre-charging method, characterized in that: The method is applied to the high-voltage pre-charging circuit according to any one of claims 1 to 8, and the method comprises: confirming that a power-on request is received; The pre-charging device is controlled to pre-charge the energy storage device using the electric energy of the high-voltage battery so that the voltage of the energy storage device reaches a target voltage, and the target voltage is determined according to the voltage of the high-voltage battery.

12. The high-voltage pre-charging method according to claim 11, characterized in that: The pre-charging device comprises a first voltage conversion unit and a second voltage conversion unit; The controlling the pre-charging device to pre-charge the energy storage device using the electric energy of the high-voltage battery comprises: Controlling the first voltage conversion unit to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery, wherein the second voltage is lower than the first voltage; The second voltage conversion unit is controlled to output a charging current to the energy storage device when receiving the first voltage, so as to pre-charge the energy storage device.

13. The high-voltage pre-charging method according to claim 12, characterized in that: The first voltage conversion unit includes a plurality of output branches, and the plurality of output branches includes at least one target output branch connected to the second voltage conversion unit; and the controlling the first voltage conversion unit to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery comprises: The output branches other than the target output branch in the first voltage conversion unit are controlled to be disconnected, and the target output branch is controlled to be closed, so as to output a second voltage to the second voltage conversion unit through the target output branch.

14. The high-voltage pre-charging method according to claim 13, characterized in that: The controlling the first voltage conversion unit to output a second voltage to the second voltage conversion unit when receiving the first voltage output by the high-voltage battery also includes: After controlling the output branches other than the target output branch to be disconnected, controlling the first voltage conversion unit to operate in a BUCK mode, so that the first voltage conversion unit converts the first voltage into the second voltage; A second voltage is output to the second voltage conversion unit.

15. The high-voltage pre-charging method according to claim 14, characterized in that: The controlling the second voltage conversion unit to output a charging current to the energy storage device when receiving the first voltage comprises: After the first voltage conversion unit operates in the BUCK mode, the second voltage conversion unit is controlled to operate in the BOOST mode, so that the second voltage conversion unit outputs a charging current to the energy storage device when receiving the first voltage.

16. The high-voltage pre-charging method according to any one of claims 11 to 15, characterized in that: The method further comprises: If the voltage of the energy storage device does not reach the target voltage after the pre-charging preset time, a pre-charging fault prompt message is output.

17. A vehicle, characterized in that: include: processor; a memory for storing processor-executable instructions; The high voltage circuit as claimed in claim 9 or 10; Wherein, the processor is configured to execute the instructions to implement the steps of the high-voltage pre-charging method as described in any one of claims 11-16.

18. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the high-voltage pre-charging method described in any one of claims 11 to 16 are implemented.

19. A computer program product, characterized in that It comprises a computer program which, when executed by a processor, implements the steps of the high-voltage pre-charging method described in any one of claims 11-16.

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