Direct-current low-voltage auxiliary power supply circuit, control method thereof and vehicle

Abstract

The invention provides a direct-current low-voltage auxiliary power supply circuit, a control method thereof and a vehicle, and belongs to the technical field of vehicle charging and discharging. The direct-current low-voltage auxiliary power supply circuit comprises a charging awakening circuit which is connected in series between an auxiliary power supply interface of a vehicle interface and a vehicle controller, and when the vehicle interface is electrically connected to an external power grid, the vehicle controller is directly awakened through the charging awakening circuit, and the auxiliary power supply interface of the vehicle interface is electrically connected to the external power grid. The vehicle controller controls a low-voltage battery to supply power to the vehicle controller; the discharging circuit comprises a low-voltage battery and a discharging control circuit, the discharging control circuit is connected between the vehicle interface and the low-voltage battery in series, when the vehicle discharges, the discharging control circuit is conducted, and the low-voltage battery discharges outwards through the discharging control circuit. According to the direct-current low-voltage auxiliary power supply circuit, the control method of the direct-current low-voltage auxiliary power supply circuit and the vehicle, the power supply requirement of a vehicle domain controller and the multi-scene vehicle discharging requirement can be met.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicle charging and discharging, and in particular relates to a direct current low-voltage auxiliary power supply circuit and a control method thereof, and a vehicle. Background Art

[0002] In the 2015 charging national standard and the 2015+ charging national standard, the operation of the low-voltage auxiliary power supply circuit is regulated. When the closed contactors in the low-voltage auxiliary power supply circuit are closed in sequence, the external power grid will supply power to the vehicle controller. The power supply voltage of the vehicle controller is 12V±5% and the power supply current is 10A. However, under the new architecture of the vehicle domain controller, the current demand of the vehicle domain controller reaches more than 40A. The old charging pile auxiliary power supply cannot meet the power supply demand of the vehicle domain controller.

[0003] At the same time, as the use scenarios of new energy vehicles continue to expand, in order to meet the vehicle discharge needs of outdoor camping, power outage emergency and outdoor work, the domain controller also needs to be compatible with the external discharge function using the auxiliary power interface. However, the DC low-voltage auxiliary power supply in the current national standard vehicle cannot meet the vehicle discharge needs in multiple scenarios and cannot meet the actual working conditions. Summary of the invention

[0004] The purpose of the present invention is to provide a DC low-voltage auxiliary power supply circuit and a vehicle, which can solve the problem that the old charging pile auxiliary power supply cannot meet the power supply demand of the vehicle domain controller and cannot meet the discharge demand of vehicles in multiple scenarios.

[0005] To achieve the above object, the present invention provides a DC low-voltage auxiliary power supply circuit and a control method thereof, and a vehicle, wherein the DC low-voltage auxiliary power supply circuit at least comprises:

[0006] A charging wake-up circuit is connected in series between the auxiliary power interface of the vehicle interface and the vehicle controller. When the vehicle interface is electrically connected to the external power grid, the vehicle controller is directly awakened by the charging wake-up circuit, and the vehicle controller controls the low-voltage battery to supply power to the vehicle controller; and

[0007] The discharge circuit includes a low-voltage battery and a discharge control circuit. The discharge control circuit is connected in series between the vehicle interface and the low-voltage battery. When the vehicle is discharging, the discharge control circuit is turned on, and the low-voltage battery discharges outward through the discharge control circuit.

[0008] In one embodiment of the present invention, the auxiliary power interface is a bidirectional interface.

[0009] In one embodiment of the present invention, the charging wake-up circuit includes a blocking resistor, and the blocking resistor is connected in series between the auxiliary power interface and the vehicle controller.

[0010] In one embodiment of the present invention, the charging wake-up circuit includes a zener diode, and the zener diode is connected in series between the connection interface between the vehicle controller and the charging wake-up circuit and a ground terminal.

[0011] In one embodiment of the present invention, the charging awakening circuit includes a voltage-stabilizing resistor, and the voltage-stabilizing resistor is connected in series between the connection interface between the vehicle controller and the charging awakening circuit and a ground terminal.

[0012] In one embodiment of the present invention, the discharge control circuit includes a control tube, which is connected in series between the positive electrode of the low-voltage battery and the auxiliary power interface. When the control tube is turned on, the low-voltage battery discharges outward.

[0013] In one embodiment of the present invention, the discharge control circuit includes a first control tube and a second control tube, and the first control tube and the second control tube are connected in series between the positive electrode of the low-voltage battery and the auxiliary power interface. When the first control tube is turned on, the low-voltage battery discharges outward.

[0014] In one embodiment of the present invention, the first control transistor is controlled by an anti-reverse chip.

[0015] In one embodiment of the present invention, the second control tube is a control tube integrated in a power distribution chip, and the second control tube is controlled by the vehicle controller.

[0016] In one embodiment of the present invention, the DC low voltage auxiliary power supply circuit further includes:

[0017] an electrostatic discharge capacitor, the electrostatic discharge capacitor being connected in series between the auxiliary power interface and the ground terminal; and

[0018] A transient voltage suppression diode is connected in series between the auxiliary power interface and the ground terminal.

[0019] The present invention also provides a control method for a DC low-voltage auxiliary power supply circuit. When the DC low-voltage auxiliary power supply circuit as described in any one of the above items is applied to vehicles that comply with the 2015 charging national standard and the 2015+ charging national standard, the control method comprises:

[0020] When charging the vehicle, after the vehicle interface is plugged in, the vehicle controller is directly awakened by the charging awakening circuit, and at this time, the discharge control circuit is controlled to be in a disconnected state; and

[0021] When the vehicle charges the external discharge load, the discharge control circuit is controlled to be in an on state, and the low-voltage battery charges the external discharge load through the discharge control circuit.

[0022] The present invention also provides a vehicle, comprising the DC low-voltage auxiliary power supply circuit as described in any one of the above items.

[0023] In summary, the present invention provides a DC low-voltage auxiliary power supply circuit and a vehicle, wherein the DC low-voltage auxiliary power supply circuit includes a charging wake-up circuit and a discharging circuit. Among them, the charging wake-up circuit is connected in series between the auxiliary power interface of the vehicle interface and the vehicle controller. When the vehicle interface is electrically connected to the external power grid, the vehicle controller is directly awakened by the charging wake-up circuit, and the vehicle controller controls the low-voltage battery to power the vehicle controller. The discharging circuit includes a low-voltage battery and a discharging control circuit. The discharging control circuit is connected in series between the vehicle interface and the low-voltage battery. When the vehicle is discharged, the discharging control circuit is turned on, and the low-voltage battery is discharged outward through the discharging control circuit. The DC low-voltage auxiliary power supply circuit provided by the present invention solves the problem that the old charging pile cannot be properly matched with the vehicle controller under the continuous iteration and update of the vehicle's electronic and electrical systems. Through the DC low-voltage auxiliary power supply circuit provided by this application, the charging of the vehicle controller no longer depends on the auxiliary power supply of the external pile end, which can avoid the charging problem caused by the low rated current of the pile end power supply and the fact that there are too many brands of piles on the market and the reliability cannot be unified. In this application, the low-voltage auxiliary power supply of the external charging pile is only used for wake-up, and the low-voltage battery in the vehicle is used to power the vehicle controller. Because there is no need to select the rated current of the auxiliary power supply of external charging piles of different brands, the vehicle controller can automatically adapt to various DC charging piles. At the same time, during the charging process, the power distribution chip and the anti-reverse chip are used for isolation, which solves the problem of power distribution from the vehicle to the external intelligent load when the vehicle is discharged. At the same time, the DC low-voltage auxiliary power supply circuit provided by this application does not need to add other power chips to the controller to power the external load, which reduces the actual cost. Furthermore, this application abandons the indirect wake-up architecture of waking up the PMIC first and then waking up the vehicle controller, and directly wakes up the vehicle controller by plugging in the gun to wake up. With the help of the LPS mode of the vehicle controller, in this mode, there is no need for ADC sampling of the sleep state, only need to compare with the numerical area recorded before sleep, to ensure the low power consumption of the domain controller, while shortening the wake-up response time, and further increasing the reliability of product function implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a circuit block diagram of a DC low-voltage auxiliary power supply circuit in an embodiment of the present application.

[0026] Figure 2 is a circuit diagram of a DC low-voltage auxiliary power supply circuit in an embodiment of the present application.

[0027] Figure 3 This is a 2015 charging national standard DC charging control guide circuit diagram in one embodiment of the present application.

[0028] Figure 4 This is a 2015+ charging national standard DC charging control guide circuit diagram in one embodiment of the present application.

[0029] Figure 5 This is a DC V2L discharge control guide circuit diagram in one embodiment of the present application.

[0030] Figure 6 It is a structural block diagram of a vehicle in one embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present application are given in the drawings. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thoroughly and comprehensively understood.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0033] In the description of the present invention, it should be understood that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. The degrees indicated by "high" and "low" are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have high and low, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0034] In the vehicle-mounted equipment, in order to ensure the smooth power supply of the vehicle, a high-voltage power supply system and a low-voltage power supply system are provided. The high-voltage power supply system and the low-voltage power supply system can supply power to the load of the vehicle at the same time, or they can supply power to the load of the vehicle separately. Among them, the low-voltage power supply system is usually implemented using a low-voltage battery, for example, a lithium-ion battery with an output of 12V. In other embodiments, the output can also be an output voltage such as 24V, 48V, etc. The high-voltage power supply system is usually implemented using a high-voltage battery, for example, a high-voltage battery with an output of 200V to 750V. Among them, the high-voltage battery is usually used to power high-voltage components such as motors and on-board chargers in the vehicle, and the low-voltage battery is usually used to power low-voltage components such as control electronic systems, lighting and auxiliary equipment. In the vehicle, a battery management system is also provided, and a power management chip (Power Management IC, PMIC) is provided in the battery management system. The battery management system can monitor the battery status, perform fault diagnosis, manage the charging and discharging process, and provide the information required by the vehicle controller to realize interactive functions, etc.

[0035] See also Figure 1 , Figures 3 to 5 As shown, in order to realize the charging and discharging of the vehicle, a vehicle interface is provided on the vehicle. When the vehicle is charging, the vehicle interface is provided between the vehicle and the external power grid 202, and when the vehicle is discharging, the vehicle interface is provided between the vehicle and the external discharge load 201. There are multiple performance interfaces on a vehicle interface. During the connection process between the vehicle and the external power grid 202, the connection and confirmation process between the vehicle and the external power grid 202 is completed, or during the connection process between the vehicle and the external discharge load 201, the connection and confirmation process between the vehicle and the external discharge load 201 is completed. Specifically, the vehicle interface has DC power supply interfaces DC+ and DC-, ground disconnection detection interfaces PE, communication interfaces S+ and S-, connection confirmation interfaces CC1, CC2, and auxiliary power supply interfaces A+ and A-. Among them, the external power grid 202 supplies power to the vehicle through the DC power supply interfaces DC+ and DC-, or the vehicle supplies power to the external discharge load 201 through the DC power supply interfaces DC+ and DC-. The ground terminal GND of the vehicle and the ground terminal GND of the external device are connected through the disconnection detection interface PE. The communication interfaces S+ and S- between the vehicle and the power grid determine whether the vehicle is in a charging or discharging state. By detecting the voltage at the connection confirmation interfaces CC1 and CC2, it is confirmed whether the vehicle interface is fully connected, and whether the ground terminal GND of the vehicle and the ground terminal GND of the external device are fully connected. The vehicle controller is charged and awakened through the auxiliary power supply interfaces A+ and A-, and the low-voltage battery of the vehicle is charged or discharged.

[0036] See also Figure 1 and Figure 2As shown, a DC low-voltage auxiliary power supply circuit provided by the present invention is arranged in a vehicle, and the DC low-voltage auxiliary power supply circuit is connected to the auxiliary power interface A+ in the vehicle interface, so that the low-voltage battery 1021 discharges outward through the DC low-voltage auxiliary power supply circuit, or charges and wakes up the vehicle controller 103 through the auxiliary power interface A+ and the DC low-voltage auxiliary power supply circuit. Specifically, the DC low-voltage auxiliary power supply circuit is connected to the auxiliary power interface A+ in the vehicle interface. And the DC low-voltage auxiliary power supply circuit provided by the present application includes a charging wake-up circuit 101 and a discharge circuit 102, wherein the charging wake-up circuit 101 is connected in series between the auxiliary power interface A+ of the vehicle interface and the vehicle controller 103. When the vehicle interface is connected to the external power grid 202, the vehicle controller 103 is directly awakened by the charging wake-up circuit 101, and the vehicle controller 103 controls the low-voltage battery 1021 to power the vehicle controller 103. The discharge circuit 102 includes a low-voltage battery 1021 and a discharge control circuit 1022. The discharge control circuit 1022 is connected in series between the auxiliary power interface A+ of the vehicle interface and the low-voltage battery 1021. When the vehicle discharges to the external discharge load 201, the discharge control circuit 1022 is turned on, and the low-voltage battery 1021 discharges outward through the discharge control circuit 1022.

[0037] See also Figure 1 As shown, in one embodiment of the present invention, the auxiliary power interface A+ in the vehicle interface is a bidirectional interface. When the vehicle interface is connected to the external power grid 202, the vehicle controller 103 is directly awakened through the auxiliary power interface A+ and the charging awakening circuit 101, and the vehicle controller 103 controls the low-voltage battery 1021 in the vehicle to supply power to the vehicle controller 103. When the vehicle interface is connected to the external discharge load 201, the discharge circuit 102 discharges to the external discharge load 201 through the auxiliary power interface A+.

[0038] See also Figure 1As shown, in one embodiment of the present invention, the charging wake-up circuit 101 connects the auxiliary power interface A+ and the vehicle controller 103, which can be implemented using a section of wire. The vehicle controller 103 is directly awakened by the charging wake-up circuit 101, without the need to first wake up the power management chip, and then use the power management chip to wake up the vehicle controller 103. Specifically, before the vehicle controller 103 wakes up, the vehicle controller 103 is in low-power (Low-Power Sampler, LPS) mode, and the voltage threshold range of the interface connecting the vehicle controller 103 and the charging wake-up circuit 101 before sleep is 0~0.1. When the vehicle is connected to the external power grid 202, the voltage threshold range of the interface connecting the vehicle controller 103 and the charging wake-up circuit 101 is 1.7~2.5. Therefore, during charging wake-up, the vehicle controller 103 only needs to compare the voltage of the interface connecting the vehicle controller 103 and the charging wake-up circuit 101 with the voltage threshold of the interface before sleep. At this time, there is no need to perform ADC sampling on the voltage of the interface connecting the vehicle controller 103 and the charging wake-up circuit 101 in the sleep state, which ensures the low power consumption of the vehicle controller 103 and shortens the response time of the charging wake-up, thereby further increasing the reliability of the product function implementation.

[0039] See also Figure 1 As shown, in one embodiment of the present invention, the charging wake-up circuit 101 only has the function of charging wake-up, and will not power the vehicle controller 103 through the auxiliary power interface A+. After the vehicle controller 103 wakes up, the vehicle controller 103 controls the low-voltage battery in the vehicle to power the vehicle controller 103. At this time, the current of the vehicle controller 103 is configured according to demand, and does not need to be limited by the rated current of the auxiliary power supply of the charging pile, which solves the problem that the charging pile cannot match the vehicle controller 103, so that the vehicle controller 103 can automatically adapt to DC charging piles with different currents.

[0040] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the charging wake-up circuit 101 also includes a blocking resistor R101, and the blocking resistor R101 is connected in series between the auxiliary power interface A+ and the vehicle controller 103. The resistance of the blocking resistor R101 is relatively large, and is a resistance in the kilo-ohm range. Specifically, the resistance of the blocking resistor R101 is, for example, 332KΩ. Setting the blocking resistor R101 between the auxiliary power interface A+ and the vehicle controller 103 can prevent the stable power supply of the external discharge load 201 from being affected by the clamping of the built-in transient voltage suppressor diode (TVS) in the vehicle controller 103 when the discharge control circuit 1022 is turned on. At the same time, it can also prevent the charging current from the low-voltage battery 1021 flowing to the external discharge load 201 from being injected into the vehicle controller 103.

[0041] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the charging wake-up circuit 101 further includes a voltage-stabilizing resistor R102 and a voltage-stabilizing diode D101. The voltage-stabilizing resistor R102 is connected in series between the connection interface between the vehicle controller 103 and the charging wake-up circuit 101 and the ground terminal GND, and the voltage-stabilizing diode D101 is connected in series between the connection interface between the vehicle controller 103 and the charging wake-up circuit 101 and the ground terminal GND, that is, after the voltage-stabilizing resistor R102 and the voltage-stabilizing diode D101 are connected in parallel, they are connected in series between the connection interface between the vehicle controller 103 and the charging wake-up circuit 101 and the ground terminal GND. In this embodiment, the resistance of the voltage-stabilizing resistor R102 is relatively large, and is a resistor in the kilo-ohm range, specifically, for example, 332KΩ. The voltage-stabilizing diode D101 is a Zener diode, and the voltage-stabilizing diode D101 is reversely connected between the connection interface between the vehicle controller 103 and the charging wake-up circuit 101 and the ground terminal GND. When the discharge control circuit 1022 is turned on, or a large voltage is input to the external vehicle interface, when the reverse voltage reaches the breakdown voltage of the voltage stabilizing diode D101, the current of the voltage stabilizing diode D101 increases sharply, but the voltage remains basically unchanged, thereby stabilizing the voltage at the interface connecting the vehicle controller 103 and the charging wake-up circuit 101, thereby achieving the voltage stabilization function. The voltage stabilizing resistor R102 can shunt the current flowing through the voltage stabilizing diode D101, thereby achieving the voltage stabilization protection function.

[0042] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the discharge circuit 102 includes a low-voltage battery 1021 and a discharge control circuit 1022, and the discharge control circuit 1022 is connected in series between the auxiliary power interface A+ of the vehicle interface and the low-voltage battery 1021. When the auxiliary power interface A+ of the vehicle interface is connected to the external discharge load 201, when the vehicle is discharged, the low-voltage battery 1021 discharges to the external discharge load 201 through the discharge control circuit 1022. In this embodiment, the discharge control circuit 1022 includes a control tube, and the control tube is connected in series between the positive electrode of the low-voltage battery 1021 and the auxiliary power interface A+ of the vehicle interface. When the control tube is turned on, the low-voltage battery 1021 discharges outward, that is, it charges the external discharge load 201.

[0043] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the control tube includes a first control tube M101 and a second control tube M102, and the first control tube M101 and the second control tube M102 are connected in series between the positive electrode of the low-voltage battery 1021 and the auxiliary power interface A+ of the vehicle interface. When the first control tube M101 and the second control tube M10 are turned on, the low-voltage battery 1021 discharges to the external discharge load 201 through the discharge control circuit 1022.

[0044] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, in order to meet the requirements of discharge routing, an anti-reverse chip 1024 and a power distribution chip 1023 are provided in the discharge circuit 102, and the anti-reverse chip 1024 and the power distribution chip 1023 are connected in series in the discharge circuit 102.

[0045] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the anti-reverse chip 1024 is connected in series in the discharge circuit 102, which can prevent the power polarity from being reversed and protect the circuit and equipment from being damaged. Specifically, the anti-reverse chip 1024 can ensure the normal flow of current by identifying the polarity of the power supply. When the power supply is normally connected, the anti-reverse chip 1024 allows current to pass and monitors the input voltage at the same time. Once the reverse connection of the power supply is detected, the anti-reverse chip 1024 will immediately cut off the power path to prevent the reverse current from damaging the circuit. In this embodiment, the model of the anti-reverse chip 1024 is, for example, LM74500.

[0046] See also Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the power distribution chip 1023 is connected in series in the discharge circuit 102, which can not only monitor and automatically control in real time, but also timely discover and handle abnormal conditions in the system, ensure the stable operation of the system, and reduce the occurrence of faults and accidents. The power distribution chip 1023 can also identify the power supply amplitude, generate corresponding short-moment waves, and promote the power output of the subsequent circuit to ensure the stable power supply of the system. In this embodiment, the model of the power distribution chip 1023 is, for example, BTS7002.

[0047] See also Figure 1 and Figure 2As shown, in one embodiment of the present invention, in order to save costs, the first control tube M101, the second control tube M102, the anti-reverse chip 1024 and the power distribution chip 1023 are combined. Specifically, the first control tube M101 is controlled by the anti-reverse chip 1024, the second control tube M102 is a control tube integrated in the power distribution chip 1023, and the second control tube M102 is controlled by the vehicle controller 103. When charging, the power distribution chip 1023 and the anti-reverse chip 1024 are not enabled, and the first control tube M101 and the second control tube M102 are disconnected, so that the electric energy of the external power grid 202 cannot be poured into the on-board low-voltage battery 1021, avoiding interference with the stability of the on-board low-voltage battery 1021. When discharging, the power distribution chip 1023 and the anti-reverse chip 1024 are enabled, the discharge circuit 102 is turned on, and the low-voltage battery 1021 can discharge to the external load device through the discharge control circuit 1022. In this embodiment, the supply voltage of the low-voltage battery 1021 is, for example, 12V, and the supply current is, for example, 15A.

[0048] See also Figure 2 As shown, the present application does not limit the specific positions of the first control tube M101 and the second control tube M102. The first control tube M101 and the anti-reverse chip 1024 can be set on the side close to the low-voltage battery 1021, or on the side close to the vehicle interface. Correspondingly, the power distribution chip 1023 provided with the second control tube M102 can be set on the side close to the vehicle interface, or on the side close to the low-voltage battery 1021. In one embodiment of the present invention, the first control tube M101 and the anti-reverse chip 1024 are set on the side close to the low-voltage battery 1021, and the power distribution chip 1023 provided with the second control tube M102 can be set on the side close to the vehicle interface for illustration. At this time, the first end of the first control tube M101 is electrically connected to the positive pole of the low-voltage battery 1021, the second end of the first control tube M101 is electrically connected to the first end of the second control tube M102, the second end of the second control tube M102 is electrically connected to the auxiliary power interface A+ of the vehicle interface, and the control end of the first control tube M101 is electrically connected to the anti-reverse chip 1024, and the control end of the second control tube M102 is electrically connected to the vehicle controller 103.

[0049] See also Figure 2 As shown, it should be noted that the first end and the second end of the control tube are not specifically designated as specific ends. In the present application, the control tube realizes the function of a switch, and the first end and the second end can be swapped.

[0050] See also Figure 2As shown, it should be noted that the present application does not specifically limit the type of control tube in the DC low-voltage auxiliary power supply circuit. In one embodiment of the present invention, the control tube is an NMOS tube. In other embodiments, the control tube may also be a PMOS tube or a field effect tube. Of course, the control tube may also be other switch devices with similar functions.

[0051] See also Figure 2 As shown, in one embodiment of the present invention, an electrostatic discharge (ESD) capacitor C101 and a transient voltage suppression diode D102 are also provided at the auxiliary power interface A+ of the vehicle interface, wherein the electrostatic discharge capacitor C101 is connected in series between the auxiliary power interface A+ and the ground terminal GND, and the transient voltage suppression diode D102 is also connected in series between the auxiliary power interface A+ and the ground terminal GND to meet the basic protection requirements for the charging and discharging interface. Specifically, the capacitance of the electrostatic discharge capacitor C101 is relatively small, such as 0.1uF or 0.01uF. The electrostatic discharge capacitor C101 is provided at the auxiliary power interface A+, which can absorb static electricity and prevent static electricity from damaging electronic components in the circuit connected to the auxiliary power interface A+. When a surge pulse voltage appears at the auxiliary power supply interface A+, the transient voltage suppression diode D102 can quickly break down and change from a high-resistance state to a low-resistance state, thereby shunting and clamping the surge voltage, thereby protecting the components in the circuit from being damaged by the instantaneous surge pulse voltage.

[0052] See also Figure 1 , Figure 2 , Figures 3 to 5 As shown, in one embodiment of the present invention, when the DC low-voltage auxiliary power supply circuit provided by the present application is applied in a vehicle, it can be applied to the charging of the vehicle by the charging pile of the 2015 charging national standard and the 2015+ charging national standard, and can also be applied to the 2015 charging national standard and the 2015+ discharge circuit 102. Figures 3 to 5 As shown, Figure 3 This is the 2015 charging national standard DC charging control guide circuit diagram. Figure 4 It is the 2015+ charging national standard DC charging control guide circuit diagram. Figure 5 This is a DC V2L discharge control guide circuit diagram. The DC low-voltage auxiliary power supply circuit provided in this application is electrically connected to the auxiliary power interface A+ of the vehicle interface. When the vehicle interface connection is confirmed to be correct through the confirmation interfaces CC1, CC2, the line detection interface PE, and the communication interfaces S+ and S-, the vehicle is powered through the DC power supply interfaces DC+ and DC-, or the vehicle is powered through the DC power supply interfaces DC+ and DC- to the external discharge load 201.

[0053] See also Figures 1 to 5As shown, in one embodiment of the present invention, when the DC low-voltage auxiliary power supply circuit provided by the present application is connected to the auxiliary power supply interface A+, when the charging pile of the 2015 charging national standard and the 2015+ charging national standard charges the vehicle, after the vehicle interface is plugged in, the charging wake-up circuit 101 in the DC low-voltage auxiliary power supply circuit directly wakes up the vehicle controller 103, and then the vehicle controller 103 controls the low-voltage battery 1021 to supply power to the vehicle controller 103. It should be noted that during the charging process, the power distribution chip 1023 and the anti-reverse chip 1024 are not enabled, and then the first control tube M101 and the second control tube M102 are controlled to be in a disconnected state, that is, the discharge control circuit is controlled to be in a disconnected state, and the power of the external charging pile (external power grid) cannot be poured into the vehicle battery. In the 2015 charging national standard and 2015+ discharge circuit 102, the power distribution chip 1023 and the anti-reverse chip 1024 are enabled, and then the first control tube M101 and the second control tube M102 are controlled to be in the on state, that is, the discharge control circuit is controlled to be in the on state, and the low-voltage battery 1021 supplies power to the external discharge load 201 through the first control tube M101 and the second control tube M102 and then through the auxiliary power interface A+. During the discharge process of the low-voltage battery 1021, since the blocking resistor R101 is provided in the charging wake-up circuit 101, the stable power supply of the external discharge load 201 is not affected during discharge, and the power of the low-voltage battery 1021 is also prevented from being poured into the vehicle controller 103.

[0054] See also Figure 6 As shown, an embodiment of the present application further provides a vehicle 10, in which a memory 11 and a processor 12 are provided. A control method for a DC low-voltage auxiliary power supply circuit is a program stored in the memory and executable on the processor, and when the processor executes the method, the steps of any one of the above methods are implemented.

[0055] Among them, the memory includes at least one type of readable storage medium, and the readable storage medium includes flash memory, mobile hard disk, multimedia card, card-type memory (for example: SD or DX memory, etc.), magnetic memory, disk, optical disk, etc. The memory can be an internal storage unit of the vehicle-mounted device in some embodiments, such as a mobile hard disk of the vehicle-mounted device. In other embodiments, the memory can also be an external storage device of the vehicle-mounted device, such as a plug-in mobile hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the vehicle-mounted device. Further, the memory can also include both the internal storage unit of the vehicle-mounted device and an external storage device. The memory can be used not only to store application software and various types of data installed in the vehicle-mounted device, but also to temporarily store data that has been output or is to be output.

[0056] In some embodiments, the processor may be composed of an integrated circuit, for example, a single packaged integrated circuit, or a plurality of packaged integrated circuits with the same or different functions, including one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and a combination of various control chips. The processor is the control core (Control Unit) of the vehicle-mounted device, and uses various interfaces and lines to connect various components of the entire vehicle-mounted device, and executes various functions of the vehicle-mounted device and processes data by running or executing programs or modules stored in the memory, and calling data stored in the memory.

[0057] The processor executes the operating system of the vehicle-mounted device and various installed application programs. The processor executes the application programs to implement the steps in the above method embodiment.

[0058] Exemplarily, the program may be divided into one or more modules, which are stored in the memory and executed by the processor to implement the present invention. The one or more modules may be a series of program instruction segments capable of implementing specific functions, which are used to describe the execution process of the program in the vehicle-mounted device.

[0059] The above-mentioned integrated unit implemented in the form of a software function module can be stored in a computer-readable storage medium. The above-mentioned software function module is stored in a storage medium, and includes a number of instructions for enabling a computer device (which can be a personal computer, a computer device, or a network device, etc.) or a processor to perform part of the functions of the lithium battery cold solder joint detection method of each embodiment of the present invention.

[0060] In summary, a DC low-voltage auxiliary power supply circuit and a vehicle are provided, wherein the DC low-voltage auxiliary power supply circuit includes a charging wake-up circuit and a discharging circuit. The charging wake-up circuit is connected in series between the auxiliary power interface of the vehicle interface and the vehicle controller. When the vehicle interface is electrically connected to the external power grid, the vehicle controller is directly awakened by the charging wake-up circuit, and the vehicle controller controls the low-voltage battery to supply power to the vehicle controller. The discharging circuit includes a low-voltage battery and a discharging control circuit, wherein the discharging control circuit is connected in series between the vehicle interface and the low-voltage battery. When the vehicle is discharging, the discharging control circuit is turned on, and the low-voltage battery is discharged outwardly through the discharging control circuit.

[0061] The embodiments of the present invention disclosed above are only used to help illustrate the present invention. The embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A DC low voltage auxiliary power supply circuit, characterized in that: At least: A charging wake-up circuit is connected in series between the auxiliary power interface of the vehicle interface and the vehicle controller. When the vehicle interface is electrically connected to the external power grid, the vehicle controller is directly awakened by the charging wake-up circuit, and the vehicle controller controls the low-voltage battery to supply power to the vehicle controller. as well as The discharge circuit includes a low-voltage battery and a discharge control circuit. The discharge control circuit is connected in series between the vehicle interface and the low-voltage battery. When the vehicle is discharging, the discharge control circuit is turned on, and the low-voltage battery discharges outward through the discharge control circuit.

2. A DC low voltage auxiliary power supply circuit according to claim 1, characterized in that: The auxiliary power interface is a bidirectional interface.

3. A DC low voltage auxiliary power supply circuit according to claim 1, characterized in that: The charging wake-up circuit includes a blocking resistor, and the blocking resistor is connected in series between the auxiliary power interface and the vehicle controller.

4. A DC low voltage auxiliary power supply circuit according to claim 1, characterized in that: The charging wake-up circuit includes a voltage-stabilizing diode, which is connected in series between the connection interface between the vehicle controller and the charging wake-up circuit and a ground terminal.

5. A DC low voltage auxiliary power supply circuit according to claim 4, characterized in that: The charging wake-up circuit includes a voltage-stabilizing resistor, which is connected in series between the connection interface between the vehicle controller and the charging wake-up circuit and a ground terminal.

6. A DC low voltage auxiliary power supply circuit according to claim 1, characterized in that: The discharge control circuit includes a control tube, which is connected in series between the positive electrode of the low-voltage battery and the auxiliary power interface. When the control tube is turned on, the low-voltage battery discharges outward.

7. A DC low voltage auxiliary power supply circuit according to claim 1, characterized in that: The discharge control circuit includes a first control tube and a second control tube, and the first control tube and the second control tube are connected in series between the positive electrode of the low-voltage battery and the auxiliary power interface. When the first control tube is turned on, the low-voltage battery discharges outward.

8. A DC low voltage auxiliary power supply circuit according to claim 7, characterized in that: The first control tube is controlled by the anti-reverse chip.

9. A DC low voltage auxiliary power supply circuit according to claim 7, characterized in that: The second control tube is a control tube integrated in the power distribution chip, and the second control tube is controlled by the vehicle controller.

10. A DC low voltage auxiliary power supply circuit according to claim 1, characterized in that: The DC low-voltage auxiliary power supply circuit also includes: an electrostatic discharge capacitor, the electrostatic discharge capacitor being connected in series between the auxiliary power interface and the ground terminal; and A transient voltage suppression diode is connected in series between the auxiliary power interface and the ground terminal.

11. A control method for a DC low-voltage auxiliary power supply circuit, characterized in that, when the DC low-voltage auxiliary power supply circuit according to any one of claims 1 to 10 is used in a vehicle that complies with the 2015 national charging standard and the 2015+ national charging standard, the control method comprises: When charging the vehicle, after the vehicle interface is plugged in, the vehicle controller is directly awakened by the charging awakening circuit, and at this time, the discharge control circuit is controlled to be in a disconnected state; as well as When the vehicle charges the external discharge load, the discharge control circuit is controlled to be in an on state, and the low-voltage battery charges the external discharge load through the discharge control circuit.

12. A vehicle, characterized in that: It comprises a DC low-voltage auxiliary power supply circuit as described in any one of claims 1 to 10.

Images