Vehicle-mounted charging circuit, control method, vehicle, storage medium and program product

Abstract

The invention relates to a vehicle-mounted charging circuit, a control method, a vehicle, a storage medium and a program product. The circuit comprises a sampling circuit unit, a booster circuit unit, an insulation resistance detection circuit unit and a vehicle-mounted battery, the sampling circuit unit is used for collecting the voltage of the charging interface; the first end of the booster circuit unit is connected with the first end of the charging interface and the first end of the vehicle-mounted battery, the second end of the booster circuit unit is connected with the second end of the charging interface and the second end of the vehicle-mounted battery, and the third end of the booster circuit unit is grounded; the insulation resistance detection circuit unit comprises a first resistor unit and a first switch, the first end of the first resistor unit is grounded through the first switch, and the second end of the first resistor unit is connected with the negative electrode end of the vehicle-mounted battery. When the voltage of the charging interface is large, the first switch is closed, and the voltage of the charging interface is released by the first resistor unit. Therefore, the multiplexing insulation resistance detection circuit does not need to add a voltage release resistor, the hardware cost is reduced, and the charging efficiency is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electric vehicles, and in particular to an on-board charging circuit, a control method, a vehicle, a storage medium, and a program product. Background Art

[0002] In order to increase the charging speed of electric vehicles, more and more electric vehicles use high-voltage power batteries with a voltage specification of 800V. However, the output voltage of most charging piles on the market is 500V, and these charging piles cannot directly charge high-voltage power batteries with a voltage specification of 800V. Therefore, a boost circuit needs to be set in the charging circuit to increase the output voltage of the charging pile to 800V before charging the power battery.

[0003] At present, most of the architectures use multiple electric drives for boosting. However, the charging port voltage sampling circuit will lead the battery pack voltage to the charging port through the filter circuit of the boost circuit, causing the charging port to be charged. When the charging pile detects that the voltage is too high when the gun is plugged in, it may cause charging failure. Therefore, it is necessary to relieve the pressure at the charging port to reduce the charging port voltage to ensure that the charging pile can charge the power battery. Summary of the invention

[0004] In order to overcome the problems existing in the related art, the present disclosure provides an on-vehicle charging circuit, a control method, a vehicle, a storage medium and a program product.

[0005] According to a first aspect of an embodiment of the present disclosure, there is provided a vehicle-mounted charging circuit, comprising: a sampling circuit unit, a boost circuit unit, an insulation resistance detection circuit unit, and a vehicle-mounted battery; The sampling circuit unit is used to be connected to the charging interface and can collect the voltage of the charging interface; The first end of the boost circuit unit is connected to the first end of the charging interface and the first end of the vehicle battery respectively, the second end of the boost circuit unit is connected to the second end of the charging interface and the second end of the vehicle battery respectively, and the third end of the boost circuit unit is grounded; The insulation resistance detection circuit unit includes a first resistance unit and a first switch, a first end of the first resistance unit is grounded via the first switch, and a second end of the first resistance unit is connected to the negative terminal of the vehicle battery; Among them, when the voltage of the charging interface collected by the sampling circuit unit when the charging gun is inserted into the charging interface is greater than a preset voltage, the first switch is closed to use the first resistance unit to relieve the pressure of the charging interface, and when the voltage of the charging interface is less than or equal to the preset voltage or the duration of the closure of the first switch reaches a preset duration, the first switch is opened.

[0006] According to a second aspect of an embodiment of the present disclosure, a control method for a vehicle-mounted charging circuit is provided, which is applied to the vehicle-mounted charging circuit provided in the first aspect of the embodiment of the present disclosure, and the control method includes: In response to detecting that a charging gun is inserted into a charging interface, collecting a voltage of the charging interface; When the voltage of the charging interface is greater than a preset voltage, controlling the first switch in the insulation resistance detection circuit to close, so as to use the first resistance unit in the insulation resistance detection circuit to relieve the pressure of the charging interface; and When the voltage of the charging interface is less than or equal to the preset voltage or the duration of the closing of the first switch reaches a preset duration, the first switch is controlled to be opened.

[0007] Optionally, the control method further includes: When the voltage of the charging interface is less than or equal to the preset voltage or the duration of the closing of the first switch reaches a preset duration, controlling the switch in the insulation resistance detection circuit unit to be in different working states to detect the insulation resistance of the vehicle; When the insulation resistance meets the charging condition, the vehicle-mounted battery is charged.

[0008] According to a third aspect of an embodiment of the present disclosure, a vehicle is provided, the vehicle comprising the on-board charging circuit provided by the first aspect of an embodiment of the present disclosure.

[0009] According to a fourth 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 method for controlling a vehicle charging circuit provided by the second aspect of the embodiment of the present disclosure are implemented.

[0010] According to a fifth aspect of an embodiment of the present disclosure, a computer program product is provided, including a computer program, which, when executed by a processor, implements the steps of the method for controlling a vehicle charging circuit provided in the second aspect of an embodiment of the present disclosure.

[0011] By adopting the above technology, in the on-board charging circuit, the insulation resistance detection circuit is reused. When the voltage of the charging interface when the charging gun is inserted into the charging interface is greater than the preset voltage, the first resistance unit 1031 is connected to the on-board charging circuit by closing the first switch K1, so as to use the first resistance unit 1031 to relieve the pressure of the charging interface 200, thereby reducing the voltage of the charging interface 200 and ensuring that the charging pile can charge the power battery. And, when the voltage of the charging interface 200 is less than or equal to the preset voltage or the duration of the closure of the first switch K1 reaches the preset duration, the first switch K1 is disconnected to cut the first resistance unit 1031 out of the main circuit. In this way, since the insulation resistance detection circuit in the reused charging circuit relieves the pressure of the charging interface, there is no need to add an additional pressure relief resistor, which reduces the hardware cost. In addition, during the charging process, the first resistance unit can be cut out of the loop and will not continue to consume power. On the one hand, it will not affect the charging efficiency, and on the other hand, it will not continue to heat up and thus will not affect the service life.

[0012] 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

[0013] 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.

[0014] Figure 1 is a schematic diagram of a vehicle charging circuit according to an exemplary embodiment.

[0015] Figure 2 is a schematic diagram of another vehicle-mounted charging circuit according to an exemplary embodiment.

[0016] Figure 3 is a schematic diagram of another vehicle-mounted charging circuit according to an exemplary embodiment.

[0017] Figure 4A is a circuit diagram of a vehicle-mounted charging circuit according to an exemplary embodiment.

[0018] Figure 4B According to an exemplary embodiment, Figure 4A Equivalent schematic diagram of the on-board charging circuit shown.

[0019] Figure 5A is a circuit diagram of a vehicle-mounted charging circuit according to an exemplary embodiment.

[0020] Figure 5B According to an exemplary embodiment, Figure 5A Equivalent schematic diagram of the on-board charging circuit shown.

[0021] Fig. 6A and 7A is a circuit diagram of another vehicle-mounted charging circuit according to an exemplary embodiment.

[0022] Figure 6B According to an exemplary embodiment Fig. 6A Equivalent schematic diagram of the on-board charging circuit shown.

[0023] Figure 7B According to an exemplary embodiment Fig. 7A Equivalent schematic diagram of the on-board charging circuit shown.

[0024] Fig. 8A and 9A is a circuit diagram of another vehicle-mounted charging circuit according to an exemplary embodiment.

[0025] Figure 8B According to an exemplary embodiment Fig. 8A Equivalent schematic diagram of the on-board charging circuit shown.

[0026] Fig. 9B According to an exemplary embodiment Fig.9A Equivalent schematic diagram of the on-board charging circuit shown.

[0027] Fig.10 is a circuit diagram of another vehicle-mounted charging circuit according to an exemplary embodiment.

[0028] Fig.11 is a circuit diagram of another vehicle-mounted charging circuit according to an exemplary embodiment.

[0029] Fig.12 The figure is a flow chart of a method for controlling a vehicle charging circuit according to an exemplary embodiment.

[0030] Fig.13 is a block diagram of a vehicle according to an exemplary embodiment. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] In the related art, a passive discharge resistor is directly connected to the charging interface, for example, a resistor is connected to both ends of the charging interface. The resistor is used to discharge the charging interface voltage. However, since the resistor needs to be connected to the charging interface all the time during the charging process, the selected voltage resistance of the resistor needs to withstand an insulation voltage resistance of 800V~1000V, which increases the hardware cost. In addition, since the resistor is always connected to the charging interface during the charging process, it will continue to consume power, affecting the charging efficiency, and the resistor will continue to heat up, causing the temperature to rise, which will affect the service life of the resistor. If the resistor is connected to the power battery circuit when not charging, it will also increase power consumption.

[0034] In view of this, the present disclosure provides a vehicle-mounted charging circuit, a control method, a vehicle, a storage medium and a program product, in which an insulation resistance detection circuit is reused. When the voltage of the charging interface 200 is greater than a preset voltage when the charging gun is inserted into the charging interface 200, the first resistance unit 1031 is connected to the vehicle-mounted charging circuit by closing the first switch K1, so as to use the first resistance unit 1031 to relieve the pressure of the charging interface 200, thereby reducing the voltage of the charging interface 200 and ensuring that the charging pile can charge the power battery. And, when the voltage of the charging interface 200 is less than or equal to the preset voltage or the duration of the closure of the first switch K1 reaches the preset duration, the first switch K1 is disconnected to cut the first resistance unit 1031 out of the main circuit. In this way, since the insulation resistance detection circuit in the reusing charging circuit does not need to be additionally added, the hardware cost is reduced. In addition, during the charging process, the first resistance unit can be cut out of the loop, and power will not be continuously consumed. On the one hand, it will not affect the charging efficiency, and on the other hand, it will not continue to heat up and thus will not affect the service life.

[0035] Figure 1 FIG. 1 is a schematic diagram of a vehicle charging circuit according to an exemplary embodiment. Figure 1 As shown, the vehicle-mounted charging circuit may include: a sampling circuit unit 101 , a boost circuit unit 102 , an insulation resistance detection circuit unit 103 and a vehicle-mounted battery 104 .

[0036] The sampling circuit unit 101 is used to be connected to the charging interface 200 and can collect the voltage of the charging interface 200. For example, the sampling circuit unit 101 can periodically collect the voltage of the charging interface 200 during the charging process, can collect the voltage of the charging interface 200 when the charging gun is inserted into the charging interface 200, can collect the voltage of the charging interface 200 when starting charging to determine the voltage specification of the charging pile, and then determine whether to use boost charging or DC charging, etc.

[0037] In the present disclosure, in order to avoid the problem that the voltage of the charging interface is large when the charging gun is inserted into the charging interface 200, thereby causing the charging pile to fail to charge the vehicle battery 104, the sampling circuit unit 101 can collect the voltage of the charging interface 200 when the charging gun is inserted into the charging interface 200. For example, in response to detecting the operation of inserting the charging gun into the charging interface 200, the sampling circuit unit 101 collects the voltage of the charging interface 200.

[0038] The first end of the boost circuit unit 102 is respectively connected to the first end of the charging interface 200 and the first end of the vehicle battery 104, the second end of the boost circuit unit 102 is respectively connected to the second end of the charging interface 200 and the second end of the vehicle battery 104, and the third end of the boost circuit unit 102 is grounded.

[0039] For example, Figure 1 As shown, the first end of the boost circuit unit 102 is respectively connected to the positive end of the charging interface 200 and the positive end of the vehicle battery 104, the second end of the boost circuit unit 102 is respectively connected to the negative end of the charging interface 200 and the negative end of the vehicle battery 104, and the third end of the boost circuit unit 102 is grounded PE. The specific structure of the boost circuit unit 102 will be described in detail below.

[0040] The insulation resistance detection circuit unit 103 includes a first resistance unit 1031 and a first switch K1 . The first end of the first resistance unit 1031 is grounded via the first switch K1 , and the second end of the first resistance unit 1031 is connected to the negative terminal of the vehicle battery 104 .

[0041] like Figure 1 As shown, the first resistance unit 1031 is located between the first switch K1 and the negative terminal of the vehicle battery 104. When the first switch K1 is closed, the first resistance unit 1031 and at least part of the circuit in the boost circuit unit 102 are connected in parallel, thereby achieving the purpose of reducing the voltage of the charging interface 200.

[0042] In the present disclosure, when the voltage of the charging interface 200 collected by the sampling circuit unit 101 when the charging gun is inserted into the charging interface 200 is greater than the preset voltage, the first switch K1 is controlled to be closed, and the first resistor unit 1031 is connected to the loop, so as to use the first resistor unit 1031 to relieve the pressure of the charging interface 200. When the voltage of the charging interface 200 is less than or equal to the preset voltage, or when the duration of the closing of the first switch K1 reaches the preset duration, the first switch K1 is controlled to be opened.

[0043] For example, the preset voltage can be a preset voltage for starting charging. When the charging pile detects that the voltage of the charging interface is greater than the preset voltage, it prohibits charging the vehicle battery. When it detects that the voltage of the charging interface is less than or equal to the preset voltage, it will start charging the vehicle battery. For example, the preset voltage can be less than or equal to 10V.

[0044] The preset duration is less than or equal to the timeout duration of the battery management system message.

[0045] First of all, it should be understood that when the voltage of the charging interface 200 is less than or equal to the preset voltage, the first switch K1 is disconnected. Since the first resistor unit 1031 cuts out the loop, the voltage of the charging interface 200 may increase again to be greater than the preset voltage. However, since the charging pile has detected that the voltage of the charging interface 200 is less than the preset voltage during the period when the first switch K1 is closed, the charging pile has assumed that it can charge normally. Therefore, even if the first switch K1 is disconnected and the voltage of the charging interface 200 increases again to be greater than the preset voltage, it will not affect the normal charging of the vehicle battery by the charging pile.

[0046] Secondly, it should be understood that the resistance value of the resistor in the first resistor unit 1031 or the boost circuit unit 102 can be adjusted to ensure that the voltage of the charging interface 200 is less than the preset voltage when the first resistor unit 1031 is cut into the loop. Specifically, how to adjust the resistance value of the resistor in the first resistor unit 1031 or the boost circuit unit 102 can be adjusted according to the actual circuit, and this disclosure does not specifically limit this.

[0047] By adopting the above technology, in the on-board charging circuit, the insulation resistance detection circuit is reused. When the voltage of the charging interface when the charging gun is inserted into the charging interface is greater than the preset voltage, the first resistance unit 1031 is connected to the on-board charging circuit by closing the first switch K1, so as to use the first resistance unit 1031 to relieve the pressure of the charging interface 200, thereby reducing the voltage of the charging interface 200 and ensuring that the charging pile can charge the power battery. And, when the voltage of the charging interface 200 is less than or equal to the preset voltage or the duration of the closure of the first switch K1 reaches the preset duration, the first switch K1 is disconnected to cut the first resistance unit 1031 out of the main circuit. In this way, since the insulation resistance detection circuit in the reused charging circuit relieves the pressure of the charging interface, there is no need to add an additional pressure relief resistor, which reduces the hardware cost. In addition, during the charging process, the first resistance unit can be cut out of the loop and will not continue to consume power. On the one hand, it will not affect the charging efficiency, and on the other hand, it will not continue to heat up and thus will not affect the service life.

[0048] In one embodiment, the boost circuit unit 102 may include a multi-phase motor 1021, a multi-phase inverter 1022, a sixth switch K6 and a booster 1023. The multi-phase coils of the multi-phase motor 1021 are respectively connected to the midpoints of the multi-phase bridge arms of the multi-phase inverter 1022 in a one-to-one correspondence, the first end and the second end of the multi-phase inverter 1022 are respectively connected to the first end and the second end of the vehicle battery 104, and the multi-phase coils of the multi-phase motor 1021 are connected to the booster (1023) via the sixth switch K6; the booster 1023 includes a first capacitor loop, the first capacitor loop includes a first capacitor C1 and a ninth resistor R9, the first ends of the first capacitor C1 and the ninth resistor R9 are both used to connect to the first end of the charging interface 200, and the second ends of the first capacitor C1 and the ninth resistor R9 are grounded.

[0049] Figure 2 FIG. 1 is a schematic diagram of another vehicle-mounted charging circuit according to an exemplary embodiment. Figure 2 As shown, assuming that the multi-phase motor 1021 is a three-phase motor and the multi-phase inverter 1022 is a three-phase inverter, the three-phase coils of the three-phase motor are respectively connected to the midpoints of the three bridge arms of the three-phase inverter in a one-to-one correspondence. For example, the midpoint of the first bridge arm of the three-phase inverter is connected to the first coil of the three-phase motor, the midpoint of the second bridge arm of the three-phase inverter is connected to the second coil of the three-phase motor, and the midpoint of the third bridge arm of the three-phase inverter is connected to the third coil of the three-phase motor. The first ends of the three bridge arms are connected to the positive terminal of the vehicle battery 104, and the second ends of the three bridge arms are connected to the negative terminal of the vehicle battery 104.

[0050] In this embodiment, since the negative copper bar of the vehicle-mounted battery 104 is eliminated, that is, the negative terminal of the vehicle-mounted battery is only charged through the direct charging path ( Figure 2The path where the direct charging switch Kzc-is located) is connected to the negative terminal of the charging interface 200. Therefore, in this embodiment, Figure 2 As shown, the booster 1023 only includes a capacitor loop connecting the positive terminal of the charging interface 200 to the ground, that is, the first capacitor C1 and the first end of the ninth resistor R9 included in the first capacitor loop are both used to be connected to the positive terminal of the charging interface 200, and the second ends of the first capacitor C1 and the ninth resistor R9 are both grounded.

[0051] It should be understood that the vehicle charging circuit also includes a direct charging switch Kzc+, and one end of the direct charging switch Kzc+ is connected to the positive terminal of the charging interface, and the other end of the direct charging switch Kzc+ is connected to the positive terminal of the vehicle battery (not shown in the figure). In the scenario where boost charging is not required, the direct charging switch Kzc- and the direct charging switch Kzc+ can be closed to use the charging pile to directly charge the vehicle battery.

[0052] In another embodiment, if the negative copper bar of the vehicle-mounted battery 104 is not removed, that is, the negative terminal of the vehicle-mounted battery can be charged through the direct charging path ( Figure 2 In addition to being connected to the negative terminal of the charging interface 200 through the path where the direct charging switch Kzc- is located, it can also be connected to the negative terminal of the charging interface 200 through another path. Figure 3 FIG. 1 is a schematic diagram of another vehicle-mounted charging circuit according to an exemplary embodiment. Figure 3 As shown, the negative terminal of the vehicle battery 104 can be charged through the direct charging path ( Figure 3 In addition to being connected to the negative terminal of the charging interface 200 through the path where the direct charging switch Kzc- is located, it can also be connected to the negative terminal of the charging interface 200 through the path where the seventh switch K7 is located.

[0053] In this embodiment, the booster 1023 may also include a capacitor loop connected between the negative terminal of the charging interface 200 and the ground, that is, a second capacitor loop. Figure 3 As shown, the second capacitor loop includes a second capacitor C2 and a tenth resistor R10, the first ends of the second capacitor C2 and the tenth resistor R10 are grounded PE, and the second ends of the second capacitor C2 and the tenth resistor R10 are respectively connected to the negative terminal of the charging interface 200 and the seventh switch K7. Among them, the capacitors in the first capacitor loop and the second capacitor loop are both Y capacitors.

[0054] In addition, the boost circuit unit 102 may include a first filter capacitor Cs1 and a thirteenth resistor R13 in addition to the multi-phase motor 1021, the multi-phase inverter 1022, the sixth switch K6, the seventh switch K7 and the booster 1023. Figure 2 and 3The first end of the first filter capacitor Cs1 is connected to the first capacitor C1 and the first end of the ninth resistor R9, and the second end of the first filter capacitor Cs1 is connected to the negative terminal of the vehicle battery 104. The thirteenth resistor R13 is connected in parallel with the first filter capacitor Cs1.

[0055] In addition, if Figure 2 As shown in FIG. 3 , the boost circuit unit 102 further includes a pre-charge capacitor Cy, a second filter capacitor Cs2 and a third filter capacitor Cs3, wherein the connection method of the pre-charge capacitor Cy, the second filter capacitor Cs2 and the third filter capacitor Cs3 is as follows: Figure 2 or Figure 3 As shown, the functions of each capacitor belong to relatively mature technologies, and the present disclosure does not make specific limitations on this.

[0056] In the present disclosure, the sampling circuit unit 101 may include a positive sampling circuit of the charging interface and a negative sampling circuit of the charging interface. Among them, the positive sampling circuit may include an eighth switch K8 and an eleventh resistor R11. The negative sampling circuit may include a ninth switch K9 and a twelfth resistor R12. Among them, the eighth switch K8 and the eleventh resistor R11 are arranged in series at the first end of the charging interface 200 and the second end of the vehicle battery 104, and the ninth switch K9 and the twelfth resistor R12 are arranged in series at the second end of the charging interface 200 and the second end of the vehicle battery 104.

[0057] For example, Figure 2 As shown in FIG. 3 , the first end of the eleventh resistor R11 is connected to the positive terminal of the charging interface 200, the second end of the eleventh resistor R11 is respectively connected to the first end of the twelfth resistor R12 and the negative terminal of the vehicle battery 104 via the eighth switch K8, the first end of the twelfth resistor R12 is also connected to the negative terminal of the vehicle battery 104, and the second end of the twelfth resistor R12 is connected to the negative terminal of the charging interface 200 via the ninth switch K9.

[0058] In one embodiment, if Figure 4A As shown in FIG. 5A , the first resistor unit 1031 may include a first resistor R1 , a first end of the first resistor R1 is grounded via a first switch K1 , and a second end of the first resistor R1 is connected to a negative terminal of the vehicle battery 104 .

[0059] Figure 4B According to an exemplary embodiment Figure 4A The equivalent schematic diagram of the vehicle charging circuit is shown in FIG. Among them, the resistor Rp is the equivalent insulation resistance of the positive terminal of the vehicle battery to the ground, and the resistor Rn is the equivalent insulation resistance of the negative terminal of the vehicle battery to the ground. Before the first switch K1 is closed, the voltage U1 of the charging interface = Rn / / (R9+R11) / [Rp+Rn / / (R9+R11)] R11 / (R9+R11) Ubatt, when the first switch K1 is closed, the voltage of the charging interface U1'=R1 / / Rn / / (R9+R11) / [Rp+ R1 / / Rn / / (R9+R11)] R11 / (R9+R11) Ubatt. Ubatt represents the voltage across the vehicle battery, and “ / / ” represents parallel connection. For example, R1 / / Rn / / (R9+R11) represents the parallel resistance of R1, Rn and (R9+R11).

[0060] It should be understood that the charging pile also has an equivalent resistance. For example, there is an equivalent resistance between the positive terminal of the charging pile and the ground, and there is an equivalent resistance between the negative terminal of the charging pile and the ground (not shown in the figure). In the present disclosure, in order to facilitate the description of the voltage of the charging interface, the equivalent resistance of the charging pile is not considered by default. In practical applications, it can be determined whether to consider the equivalent resistance of the charging pile according to demand. If the equivalent resistance of the charging pile is considered, the expression of the voltage of the charging interface described in the present disclosure will change accordingly, and the present disclosure does not specifically limit the expression of the voltage of the charging interface.

[0061] In the present disclosure, the resistance of the first resistor R1 is adjustable, that is, the resistance of the first resistor R1 can be adjusted to ensure that the voltage of the charging interface is lower than the preset voltage after the first switch K1 is closed. For example, the resistance of the first resistor R1 can be reduced. Among them, the specific adjustment method of the resistance of the first resistor R1 belongs to a relatively mature technology, and the present disclosure does not specifically limit this. In addition, the resistance of the ninth resistor R9 and / or the eleventh resistor R11 can also be adjusted, that is, the resistance of at least one of the first resistor R1, the ninth resistor R9, and the eleventh resistor R11 can be adjusted to ensure that the voltage of the charging interface is lower than the preset voltage after the first switch K1 is closed. For example, the resistance of the first resistor R1 can be reduced, the resistance of the ninth resistor R9 can be increased, and the resistance of the eleventh resistor R11 can be reduced, so that the voltage of the charging interface is lower than the preset voltage.

[0062] Figure 5B According to an exemplary embodiment Figure 5A The equivalent schematic diagram of the on-board charging circuit is shown. Before the first switch K1 is closed, the voltage U1 of the charging interface = Rn / / (R10+R12) / [Rp+Rn / / (R10+R12)] R12 / (R10+R12) Ubatt, when the first switch K1 is closed, the voltage of the charging interface U1'=R1 / / Rn / / (R10+R12) / [Rp+R1 / / Rn / / (R10+R12)] R12 / (R10+R12) Ubatt.

[0063] In this embodiment, the resistance of the first resistor R1 is adjustable, that is, the resistance of the first resistor R1 can be adjusted to ensure that the voltage of the charging interface is lower than the preset voltage after the first switch K1 is closed. Among them, the specific adjustment method of the resistance of the first resistor R1 belongs to a relatively mature technology, and the present disclosure does not make specific limitations on this. In addition, the resistance of the tenth resistor R10 and / or the twelfth resistor R12 is also adjustable, that is, the resistance of at least one of the first resistor R1, the tenth resistor R10, and the twelfth resistor R12 can be adjusted to ensure that the voltage of the charging interface is lower than the preset voltage after the first switch K1 is closed. For example, the resistance of the first resistor R1 can be reduced, the resistance of the tenth resistor R10 can be increased, and the resistance of the twelfth resistor R12 can be reduced, so that the voltage of the charging interface is lower than the preset voltage.

[0064] In another embodiment, the first resistor unit 1031 includes a second resistor R2 and a second switch K2 in addition to the first resistor R1. One of the second resistor R2 and the first resistor R1 is connected in series with the second switch K2 and then connected in parallel with the other resistor of the second resistor R2 and the first resistor R1. By way of example, the first resistor R1 is connected in series with the second switch K2 and then connected in parallel with the second resistor R2. By way of another example, the second resistor R2 is connected in series with the second switch K2 and then connected in parallel with the first resistor R1.

[0065] Fig. 6A and 7A FIG. 1 is a schematic diagram of another vehicle-mounted charging circuit according to an exemplary embodiment. Fig. 6A As shown in FIG. 7A , the second resistor R2 is connected in series with the second switch K2 and then connected in parallel with the first resistor R1 .

[0066] In this embodiment, when the voltage of the charging interface 200 is greater than a preset voltage, the first switch K1 and the second switch K2 are closed, and when the voltage of the charging interface 200 is less than or equal to the preset voltage, or when the duration of the closure of the first switch K1 and the second switch K2 reaches a preset duration, the first switch K1 and the second switch K2 are opened.

[0067] Figure 6B According to an exemplary embodiment Fig. 6A The equivalent schematic diagram of the on-board charging circuit shown in the figure. Before the first switch K1 and the second switch K2 are closed, the voltage U1 of the charging interface = Rn / / (R9+R11) / [Rp+Rn / / (R9+R11)] R11 / (R9+R11) Ubatt, when the first switch K1 and the second switch K2 are closed, the voltage of the charging interface U1'=R2 / / R1 / / Rn / / (R9+R11) / [Rp+R2 / / R1 / / Rn / / (R9+R11)] R11 / (R9+R11) Ubatt.

[0068] Figure 7B According to an exemplary embodiment Fig. 7A The equivalent schematic diagram of the on-board charging circuit shown in the figure. Before the first switch K1 and the second switch K2 are closed, the voltage U1 of the charging interface = Rn / / (R10+R12) / [Rp+Rn / / (R10+R12)] R12 / (R10+R12) Ubatt, when the first switch K1 and the second switch K2 are closed, the voltage of the charging interface U1'=R2 / / R1 / / Rn / / (R10+R12) / [Rp+R2 / / R1 / / Rn / / (R10+R12)] R12 / (R10+R12) Ubatt.

[0069] In this embodiment, the resistance values ​​of the first resistor R1 and the second resistor R2 are adjustable, that is, the resistance values ​​of the first resistor R1 and the second resistor R2 can be adjusted to ensure that the voltage of the charging interface is lower than the preset voltage after the first switch K1 is closed. For example, the resistance values ​​of the first resistor R1 and the second resistor R2 can be reduced. The specific method for adjusting the resistance values ​​of the first resistor R1 and the second resistor R2 is a relatively mature technology, and the present disclosure does not specifically limit this.

[0070] In another embodiment, in order to detect the insulation resistance of the vehicle, the insulation resistance detection circuit unit 103 may include a second resistance unit in addition to the first resistance unit, and the second resistance unit may include a third resistor R3, a fourth resistor R4 and a third switch K3. One of the third resistor R3 and the fourth resistor R4 is connected in series with the third switch K3 and then connected in parallel with the other resistor of the third resistor R3 and the fourth resistor R4.

[0071] For example, the third resistor R3 is connected in series with the third switch K3 and then connected in parallel with the fourth resistor R4, or the fourth resistor R4 is connected in series with the third switch K3 and then connected in parallel with the third resistor R3. Fig. 8A As shown in FIG9A , the third resistor R3 is connected in series with the third switch K3 and then connected in parallel with the fourth resistor R4 .

[0072] In this embodiment, when the voltage of the charging interface 200 is less than or equal to a preset voltage, or when the duration of the closure of the first switch K1 and the second switch K2 reaches a preset duration, the insulation resistance of the vehicle is detected by controlling the states of the first switch K1, the second switch K2 and the third switch K3.

[0073] Figure 8B According to an exemplary embodiment, Fig. 8A The equivalent schematic diagram of the on-board charging circuit shown in the figure. Before the first switch K1 and the second switch K2 are closed, the voltage U1 of the charging interface = Rn / / (R9+R11) / [Rp+Rn / / (R9+R11)] R11 / (R9+R11) Ubatt, when the first switch K1 and the second switch K2 are closed, the voltage of the charging interface U1'=R2 / / R1 / / Rn / / (R9+R11) / [R4 / / Rp+R2 / / R1 / / Rn / / (R9+R11)] R11 / (R9+R11) Ubatt.

[0074] Fig. 9B According to an exemplary embodiment Fig.9A The equivalent schematic diagram of the on-board charging circuit shown in the figure. Before the first switch K1 and the second switch K2 are closed, the voltage U1 of the charging interface = Rn / / (R10+R12) / [Rp+Rn / / (R10+R12)] R12 / (R10+R12) Ubatt, when the first switch K1 and the second switch K2 are closed, the voltage of the charging interface U1'=R2 / / R1 / / Rn / / (R10+R12) / [R4 / / Rp+R2 / / R1 / / Rn / / (R10+R12)] R12 / (R10+R12) Ubatt.

[0075] In the above embodiment, in order to ensure that the voltage of the charging interface can be reduced to below the preset voltage, the resistance of at least one of the first resistor R1, the second resistor R2, and the resistor in the second resistor unit that is not connected in series with the third switch K3 is adjustable. In this way, the resistance of the first resistor R1, the second resistor R2, and the resistor in parallel with the branch where the third switch K3 is located can be dynamically adjusted according to actual needs. For example, the resistance of the first resistor R1 and the second resistor R2 can be reduced, and the resistance of the resistor in the second resistor unit that is not connected in series with the third switch K3 can be increased.

[0076] By adopting the above technical solution, when the voltage of the charging interface is higher than the preset voltage, the resistor in the insulation detection circuit unit is connected in parallel with the resistors in the boost circuit unit 102 and the sampling circuit unit 101 through the first switch K1, or the first switch K1 and the second switch K2, so that the voltage of the charging interface can be reduced, so that the charging pile can recognize that the voltage of the charging interface is lower than the preset voltage, thereby ensuring that the charging pile can charge the vehicle battery normally.

[0077] In addition, when the charging pile recognizes that the voltage of the charging interface is lower than the preset voltage, it injects an insulation detection voltage into the charging port to enable the insulation resistance detection circuit unit to work normally for insulation detection. In this way, the insulation resistance detection circuit unit is reused for pressure relief, which reduces the hardware cost on the one hand, and on the other hand, since the insulation resistance detection circuit unit can be cut out of the loop during charging, it will not continue to consume power, which will not affect the charging efficiency on the one hand, and will not continue to generate heat and thus will not affect the service life on the other hand.

[0078] In the present disclosure, the circuit structure of the insulation resistance detection circuit unit 103 is not limited to the structure described above, and other circuit structures are also applicable to the vehicle-mounted charging circuit in the present disclosure.

[0079] In one embodiment, the first resistor unit 1031 may include a fifth resistor R5, a sixth resistor R6 and a fourth switch K4, wherein the fifth resistor R5 and the sixth resistor R6 are connected in series to form a first series branch, and the fourth switch K4 is connected in parallel with the fifth resistor R5 or the sixth resistor R6. The first end of the first series branch is connected to the first switch K1, and the second end of the first series branch is connected to the negative terminal of the vehicle battery. In this embodiment, when the voltage of the charging interface 200 is greater than the preset voltage, the first switch K1 and the fourth switch K4 are controlled to be closed, and when the voltage of the charging interface 200 is less than or equal to the preset voltage, or when the duration of the closing of the first switch K1 and the fourth switch K4 reaches the preset duration, the first switch K1 and the fourth switch K4 are disconnected.

[0080] Among them, considering that the smaller the resistor connected in parallel with the resistors in the boost circuit unit 102 and the sampling circuit unit 101 (for example, the ninth resistor R9 and the eleventh resistor R11, or the tenth resistor R10 and the twelfth resistor R12), the smaller the voltage of the charging interface 200 will be, the resistor connected in parallel with the fourth switch K4 is preferably the resistor with a larger resistance value among the fifth resistor R5 and the sixth resistor R6. For example, if the resistance value of the fifth resistor R5 is greater than the resistance value of the sixth resistor R6, the fourth switch K4 is preferably connected in parallel with the fifth resistor R5.

[0081] like Fig.10 As shown, the fifth resistor R5 is connected in series with the sixth resistor R6, and the fifth resistor R5 is connected in parallel with the fourth switch K4. Fig.10 In the example, before the first switch K1 and the fourth switch K4 are closed, the voltage U1 of the charging interface 200 = Rn / / (R9+R11) / [Rp+Rn / / (R9+R11)] R11 / (R9+R11) Ubatt, when the first switch K1 and the fourth switch K4 are closed, the voltage U1' of the charging interface 200 = R6 / / Rn / / (R9+R11) / [Rp+R6 / / Rn / / (R9+R11)] R11 / (R9+R11) Ubatt.

[0082] In this way, by connecting a resistor in the first resistor unit in parallel to the loop, the voltage of the charging interface can be reduced. In addition, the resistance of the resistor not connected in parallel with the fourth switch K4 can be adjusted to ensure that the voltage of the charging interface can be lower than the preset voltage by adjusting the resistance of the resistor. Similarly, as described above, the resistance of the ninth resistor R9 and / or the eleventh resistor R11 can also be adjusted. For example, the resistance of the resistor not connected in parallel with the fourth switch K4 can be reduced, the resistance of the eleventh resistor R11 can be reduced, and the resistance of the ninth resistor R9 can be increased.

[0083] In another embodiment, if Fig.11 As shown, the insulation resistance detection circuit unit 103 may further include a third resistance unit, and the third resistance unit may include a seventh resistor R7, an eighth resistor R8 and a fifth switch K5. The seventh resistor R7 and the eighth resistor R8 are connected in series to form a second series branch, and the fifth switch K5 is connected in parallel with the seventh resistor R7 or the eighth resistor R8. The first end of the second series branch is connected to the first end of the vehicle battery 104, and the second end of the second series branch is connected to the first end of the first switch K1.

[0084] In the process of pressure relief, the fifth switch K5 is always in an open state, so that the resistance in parallel with the equivalent insulation resistance Rp of the positive terminal of the vehicle battery to the ground is maximized. When the voltage of the charging interface 200 is less than or equal to the preset voltage, or when the duration of the closing of the first switch K1 and the fourth switch K4 reaches the preset duration, the insulation resistance of the vehicle is detected by controlling the states of the first switch K1, the fourth switch K4 and the fifth switch K5.

[0085] exist Fig.11 In the example, before the first switch K1 and the fourth switch K4 are closed, the voltage U1 of the charging interface 200 is Rn / / (R9+R11) / [Rp+Rn / / (R9+R11)] R11 / (R9+R11) Ubatt, when the first switch K1 and the fourth switch K4 are on, the voltage U1' of the charging interface 200 = R6 / / Rn / / (R9+R11) / [(R7+R8) / / Rp+R6 / / Rn / / (R9+R11)] R11 / (R9+R11) Ubatt.

[0086] In the above embodiment, in order to ensure that the voltage of the charging interface can be reduced to below the preset voltage, the resistance of at least one of the resistor not connected in parallel with the fourth switch K4 in the first resistor unit, the seventh resistor R7 and the eighth resistor R8 is adjustable. In this way, the resistance of at least one of the seventh resistor R7 and the eighth resistor R8 not connected in parallel with the fourth switch K4 in the first resistor unit can be dynamically adjusted according to actual needs. For example, the resistance of the resistor not connected in parallel with the fourth switch K4 in the first resistor unit can be reduced, and the resistance of the seventh resistor R7 and the eighth resistor R8 can be increased.

[0087] By adopting the above technical solution, when the voltage of the charging interface is higher than the preset voltage, the resistor in the insulation detection circuit unit is connected in parallel with the resistors in the boost circuit unit 102 and the sampling circuit unit 101 into the loop through the first switch K1, or the first switch K1 and the fourth switch K4, so that the voltage of the charging interface can be reduced, so that the charging pile can recognize that the voltage of the charging interface is lower than the preset voltage, thereby ensuring that the charging pile can charge the vehicle battery normally.

[0088] In addition, when the charging pile recognizes that the voltage of the charging interface is lower than the preset voltage, it injects an insulation detection voltage into the charging port to enable the insulation resistance detection circuit unit to work normally for insulation detection. In this way, the insulation resistance detection circuit unit is reused for pressure relief, which reduces the hardware cost on the one hand, and on the other hand, since the insulation resistance detection circuit unit can be cut out of the loop during charging, it will not continue to consume power, which will not affect the charging efficiency on the one hand, and will not continue to generate heat and thus will not affect the service life on the other hand.

[0089] Based on the same inventive concept, the present disclosure also provides a control method for a vehicle-mounted charging circuit. Fig.12 FIG. 1 is a flow chart showing a control method of a vehicle-mounted charging circuit according to an exemplary embodiment. The control method can be applied to the vehicle-mounted charging circuit provided by the present disclosure. Fig.12 As shown, the control method may include the following steps.

[0090] In step S121 , in response to detecting that the charging gun is inserted into the charging interface, the voltage of the charging interface is collected.

[0091] For example, the voltage of the charging interface may be collected by a sampling circuit unit.

[0092] In step S122, when the voltage of the charging interface is greater than a preset voltage, the first switch in the insulation resistance detection circuit is controlled to be closed, so as to relieve the pressure of the charging interface by using the first resistance unit in the insulation resistance detection circuit.

[0093] In step S123, when the voltage of the charging interface is less than or equal to a preset voltage or the duration of the first switch being closed reaches a preset duration, the first switch is controlled to be opened.

[0094] By adopting the above technical solution, since the insulation resistance detection circuit in the multiplexing charging circuit is used to relieve the pressure of the charging interface, no additional pressure relief resistor is required, thus reducing the hardware cost. In addition, during the charging process, the first resistance unit can be cut out of the loop and will not continue to consume power. On the one hand, it will not affect the charging efficiency, and on the other hand, it will not continue to heat up and thus will not affect the service life.

[0095] Optionally, the control method may further include: When the voltage of the charging interface is less than or equal to the preset voltage or the duration of the closing of the first switch reaches a preset duration, controlling the switch in the insulation resistance detection circuit unit to be in different working states to detect the insulation resistance of the vehicle; When the insulation resistance meets the charging condition, the vehicle-mounted battery is charged.

[0096] For example, it is assumed that the structure of the insulation resistance detection circuit unit is as follows Fig. 8A As shown in or 9A, the insulation resistance of the vehicle can be determined by controlling the working state of the three switches in the insulation resistance detection circuit unit. Among them, the charging condition can be that the minimum value of the insulation resistance is greater than 100Ω / V. For example, if the minimum value of the insulation resistance is greater than 500Ω / V, it is considered safe and can be charged. If the minimum value of the insulation resistance is greater than 100Ω / V and less than or equal to 500Ω / V, it is considered that the insulation of the vehicle is abnormal and an abnormal alarm can be issued. However, at this time, normal charging can still be performed. If the minimum value of the insulation resistance is less than 100Ω / V, it is considered that the vehicle has an insulation failure, and charging should be stopped at this time.

[0097] In order to facilitate those skilled in the art to better understand the control method provided by the present disclosure, the charging process is described below with a complete embodiment.

[0098] The charging process may include: first, detecting that the charging gun is inserted into the charging interface. Then, closing the eighth switch K8 and the ninth switch K9 to collect the voltage of the charging interface. If the voltage of the charging interface is greater than the preset voltage, close the first switch K1 to use the first resistance unit 1031 to relieve the pressure of the charging interface 200. Continue to collect the voltage of the charging interface until the voltage is lower than the preset voltage, at which time, disconnect the first switch K1. Afterwards, send a BHM message to start charging. After starting charging, use the insulation resistance detection circuit unit to perform insulation detection mode to detect the insulation resistance of the vehicle.

[0099] By adopting the above technical solution, at the moment when the charging gun is inserted into the charging interface, when the voltage of the charging interface is greater than the preset voltage, the first switch K1 is closed, which effectively reduces the voltage of the charging interface, so that the charging pile can recognize that the voltage of the charging interface is lower than the preset voltage, and smoothly start charging to ensure charging compatibility.

[0100] In addition, the switch in the insulation resistance detection circuit unit can be used to connect the resistor in the insulation resistance detection circuit unit in parallel to the main circuit for pressure relief without adding additional hardware costs. After the pressure relief is completed, the resistor is cut out of the main circuit by disconnecting the switch, which will not continue to consume power, thereby not affecting the charging efficiency, and can also prevent the resistor from continuing to heat up, thereby not affecting the normal service life of the resistor.

[0101] The present disclosure also provides a computer-readable storage medium having computer program instructions stored thereon, which, when executed by a processor, implement the steps of the method for controlling a vehicle-mounted charging circuit provided by the present disclosure.

[0102] Fig.13 6 is a block diagram of a vehicle according to an exemplary embodiment. For example, vehicle 600 may be a hybrid vehicle, a non-hybrid vehicle, an electric vehicle, a fuel cell vehicle, or other types of vehicles. Vehicle 600 may be an autonomous vehicle, a semi-autonomous vehicle, or a non-autonomous vehicle. The vehicle may include an on-board charging circuit provided by the present disclosure.

[0103] Reference Fig.13 , the vehicle 600 may include various subsystems, for example, an infotainment system 610, a perception system 620, a decision control system 630, a drive system 640, and a computing platform 650. The vehicle 600 may also include more or fewer subsystems, and each subsystem may include multiple components. In addition, each subsystem and each component of the vehicle 600 may be interconnected by wire or wireless means.

[0104] In some embodiments, the infotainment system 610 may include a communication system, an entertainment system, and a navigation system, among others.

[0105] The perception system 620 may include several sensors for sensing information about the environment around the vehicle 600. For example, the perception system 620 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.

[0106] The decision control system 630 may include a computing system, a vehicle controller, a steering system, a throttle, and a braking system.

[0107] The drive system 640 may include components that provide powered motion for the vehicle 600. In one embodiment, the drive system 640 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.

[0108] Some or all functions of the vehicle 600 are controlled by a computing platform 650. The computing platform 650 may include at least one processor 651 and a memory 652, and the processor 651 may execute instructions 653 stored in the memory 652.

[0109] The processor 651 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.

[0110] The memory 652 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.

[0111] In addition to the instructions 653 , the memory 652 may also store data, such as road maps, route information, and data such as the location, direction, and speed of the vehicle. The data stored in the memory 652 may be used by the computing platform 650 .

[0112] In the embodiment of the present disclosure, the processor 651 may execute the instruction 653 to complete all or part of the steps of the above-mentioned method for controlling the vehicle charging circuit.

[0113] In another exemplary embodiment, a computer program product is also 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 control method of the on-board charging circuit when executed by the programmable device.

[0114] 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".

[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.

[0116] It should be understood that, unless otherwise specifically noted, the features of some embodiments of the various present disclosures described herein may be combined with each other. As used herein, the term "and / or" includes any one of the related listed items and any combination of any two or more; similarly, "at least one of . . . " includes any one of the related listed items and any combination of any two or more.

[0117] Although terms such as "first", "second" and "third" can be used herein to describe various components, parts, regions, layers or sections, these components, parts, regions, layers or sections are not limited to these terms. On the contrary, these terms are only used to distinguish one component, component, region, layer or section from another component, component, region, layer or section. Therefore, without departing from the teachings of each example, the first component, component, region, layer or section mentioned in the examples described herein may also be referred to as the second component, component, region, layer or section. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" may expressly or implicitly include at least one of the features. In the description herein, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0118] 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 beneficial 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".

[0119] 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.

Claims

1. A vehicle-mounted charging circuit, characterized in that: include: A sampling circuit unit (101), a boost circuit unit (102), an insulation resistance detection circuit unit (103) and a vehicle battery (104); The sampling circuit unit (101) is used to be connected to the charging interface (200) and is capable of collecting the voltage of the charging interface (200); The first end of the boost circuit unit (102) is respectively connected to the first end of the charging interface (200) and the first end of the vehicle battery (104); the second end of the boost circuit unit (102) is respectively connected to the second end of the charging interface (200) and the second end of the vehicle battery (104); and the third end of the boost circuit unit (102) is grounded; The insulation resistance detection circuit unit (103) comprises a first resistance unit (1031) and a first switch (K1), wherein a first end of the first resistance unit (1031) is grounded via the first switch (K1), and a second end of the first resistance unit (1031) is connected to a negative terminal of the vehicle battery (104); Wherein, when the voltage of the charging interface (200) collected by the sampling circuit unit (101) when the charging gun is inserted into the charging interface (200) is greater than a preset voltage, the first switch (K1) is closed to relieve the pressure of the charging interface (200) by using the first resistance unit (1031); and when the voltage of the charging interface (200) is less than or equal to the preset voltage or the duration of the closing of the first switch (K1) reaches a preset duration, the first switch (K1) is opened.

2. The vehicle-mounted charging circuit according to claim 1, characterized in that: The first resistor unit (1031) comprises a first resistor (R1), a first end of the first resistor (R1) is grounded via the first switch (K1), and a second end of the first resistor (R1) is connected to the negative terminal of the vehicle battery (104).

3. The vehicle-mounted charging circuit according to claim 2, characterized in that: The first resistor unit (1031) further comprises: a second resistor (R2) and a second switch (K2), wherein one of the second resistor (R2) and the first resistor (R1) is connected in series with the second switch (K2) and then connected in parallel with the other resistor of the second resistor (R2) and the first resistor (R1); Wherein, when the voltage of the charging interface (200) is greater than a preset voltage, the first switch (K1) and the second switch (K2) are closed, and when the voltage of the charging interface (200) is less than or equal to the preset voltage, or when the duration of the closure of the first switch (K1) and the second switch (K2) reaches a preset duration, the first switch (K1) and the second switch (K2) are opened.

4. The vehicle-mounted charging circuit according to claim 3, characterized in that: The insulation resistance detection circuit unit (103) further comprises a second resistance unit, wherein the second resistance unit comprises: a third resistor (R3), a fourth resistor (R4) and a third switch (K3); One of the third resistor (R3) and the fourth resistor (R4) is connected in series with the third switch (K3) and then connected in parallel with the other resistor of the third resistor (R3) and the fourth resistor (R4); When the voltage of the charging interface (200) is less than or equal to the preset voltage, or when the duration of the closing of the first switch (K1) and the second switch (K2) reaches a preset duration, the insulation resistance of the vehicle is detected by controlling the working states of the first switch (K1), the second switch (K2) and the third switch (K3).

5. The vehicle-mounted charging circuit according to claim 4, characterized in that: The resistance value of at least one of the first resistor (R1), the second resistor (R2), and the resistor in the second resistor unit that is not connected in series with the third switch (K3) is adjustable.

6. The vehicle-mounted charging circuit according to claim 1, characterized in that: The first resistance unit (1031) comprises: a fifth resistor (R5), a sixth resistor (R6) and a fourth switch (K4); The fifth resistor (R5) and the sixth resistor (R6) are connected in series to form a first series branch, and the fourth switch (K4) is connected in parallel with the fifth resistor (R5) or the sixth resistor (R6); The first end of the first series branch is connected to the first switch (K1), and the second end of the first series branch is connected to the negative terminal of the vehicle battery (104); Wherein, when the voltage of the charging interface (200) is greater than a preset voltage, the first switch (K1) and the fourth switch (K4) are controlled to be closed, and when the voltage of the charging interface (200) is less than or equal to the preset voltage, or when the duration of the closing of the first switch (K1) and the fourth switch (K4) reaches a preset duration, the first switch (K1) and the fourth switch (K4) are opened.

7. The vehicle-mounted charging circuit according to claim 6, characterized in that: The insulation resistance detection circuit unit (103) further comprises a third resistance unit, wherein the third resistance unit comprises: a seventh resistor (R7), an eighth resistor (R8) and a fifth switch (K5); The seventh resistor (R7) and the eighth resistor (R8) are connected in series to form a second series branch, and the fifth switch (K5) is connected in parallel with the seventh resistor (R7) and the eighth resistor (R8); The first end of the second series branch is connected to the positive terminal of the vehicle battery (104), and the second end of the second series branch is connected to the first end of the first switch (K1); When the voltage of the charging interface (200) is less than or equal to the preset voltage, or when the duration of the closing of the first switch (K1) and the fourth switch (K4) reaches a preset duration, the insulation resistance of the vehicle is detected by controlling the working states of the first switch (K1), the fourth switch (K4) and the fifth switch (K5).

8. The vehicle-mounted charging circuit according to claim 7, characterized in that: The resistance value of at least one of the resistor in the first resistor unit that is not connected in parallel with the fourth switch (K4), the seventh resistor (R7) and the eighth resistor (R8) is adjustable.

9. The vehicle-mounted charging circuit according to any one of claims 1 to 8, characterized in that: The boost circuit unit (102) comprises: a multi-phase motor (1021), a multi-phase inverter (1022), a sixth switch (K6) and a booster (1023); The multi-phase coils of the multi-phase motor (1021) are respectively connected to the midpoints of the multi-phase bridge arms of the multi-phase inverter (1022) in a one-to-one correspondence, the first end and the second end of the multi-phase inverter (1022) are respectively connected to the first end and the second end of the vehicle battery (104), and the multi-phase coils of the multi-phase motor (1021) are connected to the booster (1023) via the sixth switch (K6); The booster (1023) comprises a first capacitor circuit, the first capacitor circuit comprising a first capacitor (C1) and a ninth resistor (R9), the first ends of the first capacitor (C1) and the ninth resistor (R9) are both used to be connected to the positive terminal of the charging interface (200), and the second ends of the first capacitor (C1) and the ninth resistor (R9) are grounded.

10. The vehicle-mounted charging circuit according to claim 9, characterized in that: The boost circuit unit (102) further comprises: a seventh switch (K7), the seventh switch (K7) being located between the negative terminal of the vehicle battery (104) and the booster (1023); The booster (1023) further comprises a second capacitor circuit, the second capacitor circuit comprising a second capacitor (C2) and a tenth resistor (R10), the first ends of the second capacitor (C2) and the tenth resistor (R10) being grounded, and the second ends of the second capacitor (C2) and the tenth resistor (R10) being respectively connected to the negative terminal of the charging interface (200) and the seventh switch (K7).

11. The vehicle-mounted charging circuit according to any one of claims 1 to 8, characterized in that: The sampling circuit unit (101) comprises: an eighth switch (K8), an eleventh resistor (R11), a ninth switch (K9) and a twelfth resistor (R12); The eighth switch (K8) and the eleventh resistor (R11) are arranged in series at a first end of the charging interface (200) and a second end of the vehicle battery (104); The ninth switch (K9) and the twelfth resistor (R12) are arranged in series at the second end of the charging interface (200) and the second end of the vehicle battery (104).

12. A method for controlling a vehicle-mounted charging circuit, characterized in that: Applied to the vehicle-mounted charging circuit according to any one of claims 1 to 11, the control method comprises: In response to detecting that a charging gun is inserted into a charging interface, collecting a voltage of the charging interface; When the voltage of the charging interface is greater than a preset voltage, controlling the first switch in the insulation resistance detection circuit to close, so as to use the first resistance unit in the insulation resistance detection circuit to relieve the pressure of the charging interface; and When the voltage of the charging interface is less than or equal to the preset voltage or the duration of the closing of the first switch reaches a preset duration, the first switch is controlled to be opened.

13. The control method according to claim 12, characterized in that: Applied to the vehicle-mounted charging circuit according to claim 4 or 7, the control method further comprises: When the voltage of the charging interface is less than or equal to the preset voltage or the duration of the closing of the first switch reaches a preset duration, controlling the switch in the insulation resistance detection circuit unit to be in different working states to detect the insulation resistance of the vehicle; When the insulation resistance meets the charging condition, the vehicle-mounted battery is charged.

14. A vehicle, characterized in that: The vehicle comprises the on-board charging circuit according to any one of claims 1-11.

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