A Discharge Control Method for a Non-Vehicle Bi-Directional Charger

Abstract

The present invention discloses a discharge control method for a non-vehicle-mounted bidirectional charger, wherein the partial discharge control electrical architecture of the charger includes an isolated auxiliary power supply 1, whose input end is connected to the A+A interface; its output end is combined with the low-voltage power supply inside the charger; the output voltage of the low-voltage battery of the vehicle is connected to the A+A interface by the in-vehicle adapter. The key control process is as follows: after the vehicle interface and the charging gun are plugged in, the vehicle first detects the plug-in status; after the detection is passed, the vehicle controls A+A to supply low voltage to the charger; after the charger detects that the connection status of the charging gun is normal, the vehicle enters insulation detection; after the insulation detection is passed, the vehicle outputs high voltage, and the charger controls the DC bus to power on; the auxiliary power supply 1 is taken over by the auxiliary power supply inside the charger; thereafter, the vehicle can no longer power the charger through A+A. The present invention enables the charger to accept the high-voltage DC output of the vehicle after completing the insulation detection during the discharge process, which has better safety protection.

Description

Technical Field

[0001] The present invention relates to new energy vehicles, in particular to a discharge control method for a non-vehicle-mounted bidirectional charger. Background Art

[0002] Due to the existence of the disconnecting mechanism (DC contactor) at the output end of the non-vehicle-mounted charger, when discharging in the reverse direction, if a dedicated DCDC converter is used to obtain the low-voltage control power supply inside the charger from the high-voltage DC terminal, the cost of this part of the module is relatively high and it occupies a relatively large space.

[0003] Another defect of taking power from the high-voltage DC terminal is that when the insulation detection is carried out before the inverter discharges, that is, when the insulation detection is not yet completed, the non-vehicle-mounted charger is already powered on by the high-voltage terminal. This not only makes it impossible to decouple the insulation detection from the power-on startup of the non-vehicle-mounted charger, affecting the insulation detection result, but also may pose a safety hazard. And if an external battery is used as the control power supply for the inverter starting machine, there are maintenance problems such as battery exhaustion and replacement.

[0004] The existing in-vehicle bidirectional charging, as an in-vehicle component, can conveniently use the in-vehicle battery for power supply. This kind of discharge scheme or strategy is not applicable to the non-vehicle-mounted charger. Summary of the Invention

[0005] Object of the Invention: The object of the present invention is to provide a discharge control method for a non-vehicle-mounted bidirectional charger, enabling inverter discharge without the need to carry an additional battery, while also avoiding taking power from the high-voltage DC terminal for inverter starting machine control, ensuring the normal operation of the insulation detection, and guaranteeing the safety of the charging process.

[0006] Technical Solution: A discharge control method for a non-vehicle-mounted bidirectional charger according to the present invention includes the following steps:

[0007] (1) After the vehicle interface is plugged into the charging gun, the vehicle performs a connection state detection.

[0008] (2) After the vehicle detects good plugging, it controls A+A- to supply low voltage to the charger.

[0009] (3) The charger performs a plugging state detection.

[0010] (4) After both parties confirm good plugging, the vehicle performs an insulation detection.

[0011] (5) After the insulation detection passes, the charger closes the DC terminal contactor.

[0012] (6) The vehicle DC high-voltage terminal outputs externally.

[0013] (7) The charger is powered on at high voltage, and the DC bus takes over the A+A- power supply.

[0014] (8) The vehicle stops supplying power to A+ and A-.

[0015] (9) The charger is ready.

[0016] When the above discharge control method is adopted, the specific control timing inside the charger is as follows:

[0017] (1) The vehicle supplies power to the internal auxiliary power supply of the charger through A+ and A-.

[0018] (2) The charger completes the detection of the gun-end connection state.

[0019] (3) The charger waits for the vehicle insulation detection result.

[0020] (4) After the charger obtains the result of passing the insulation detection, it closes the high-voltage DC contactor.

[0021] (5) After the charger obtains the high-voltage input, the drive circuit controls the operation of the DCDC power tube at the rear stage of the charger to make the DC bus voltage reach the predetermined value.

[0022] (6) The drive power supply is powered by the DC bus and takes over the power supply of the auxiliary power supply 1.

[0023] (7) The charger is ready.

[0024] The control flow chart is as Figure 2 shown, where the dashed line indicates that this process step needs to be carried out after the vehicle-machine information interaction.

[0025] A computer storage medium stores a computer program thereon. When the computer program is executed by a processor, it implements the above discharge control method of a non-vehicle-mounted bidirectional charger.

[0026] A computer device includes a storage, a processor, and a computer program stored on the storage and executable on the processor. When the processor executes the computer program, it implements the above discharge control method of a non-vehicle-mounted bidirectional charger.

[0027] An internal power supply architecture of a charger includes an isolated low-voltage auxiliary power supply powered by an A+A- interface. The isolated low-voltage auxiliary power supply can supply power to the power tube drive circuit and other related control circuits inside the charger. During the power supply period of the low-voltage auxiliary power supply, the vehicle can perform insulation detection on the discharge system. After the DC bus inside the charger is powered on, the isolated low-voltage auxiliary power supply can be taken over and the isolated low-voltage auxiliary power supply can stop supplying power.

[0028] Beneficial effects: Compared with the prior art, the present invention has the following advantages:

[0029] (1) The present invention can perform bidirectional charging without carrying an additional battery.

[0030] (2) The present invention meets the safety requirement of applying DC high voltage after completing insulation detection during the discharging process, and has good safety protection.

[0031] (3) The present invention avoids taking power from the high-voltage DC output terminal for the internal auxiliary power supply and drive power supply, and simplifies the design complexity of the charger. Description of the Drawings

[0032] Figure 1 is the principle architecture block diagram of the present invention;

[0033] Figure 2 is the step flow chart of the present invention. Detailed Embodiment

[0034] The technical solution of the present invention will be further described below in conjunction with the drawings.

[0035] As Figure 1 shown in the principle architecture, a discharging control method for a non-vehicle-mounted bidirectional charger includes the following steps:

[0036] (1) After the vehicle interface is plugged in with the charging gun, the vehicle detects the connection state of the charging gun through the connection status signal.

[0037] (2) After the vehicle confirms that the charging gun is well connected, it controls A+A- to supply low voltage to the charger.

[0038] (3) After the low-voltage control circuit of the charger is powered on, it detects the connection state of the charging gun.

[0039] (4) After both parties confirm the normal connection, the vehicle closes the DC high-voltage contactor at the vehicle end and performs insulation detection.

[0040] (5) The vehicle sends the insulation detection result to the charger. When the insulation detection passes, the vehicle-charger continues handshake interaction, and the content can include necessary interaction parameters; if the insulation detection fails, after receiving the detection result, the charger aborts the discharging process and issues an alarm.

[0041] (6) When the insulation detection and the self-check of the charger are normal, the charger closes the DC-side contactor and sends a status message to the vehicle.

[0042] (7) After receiving the normal status message from the charger, the vehicle starts to output DC high voltage externally.

[0043] (8) The power module of the charger starts to operate under the power supply and drive of the auxiliary power supply 1, the DC bus is powered on, and takes over the A+A- power supply; the charger sends a status message.

[0044] (9) After the vehicle receives the status message, A+A- stops supplying power to the charger;

[0045] (10) The system enters the discharge ready state.

[0046] When the above discharge control method is adopted, the specific control timing inside the charger is as follows:

[0047] (1) A+A- supplies power to the internal auxiliary power supply 1 of the charger, and the low-voltage control circuit inside the charger is powered on;

[0048] (2) The charger completes the detection of the gun-end connection state;

[0049] (3) The charger waits for the vehicle insulation detection result;

[0050] (4) After the charger obtains the result of passing the insulation detection, it closes the high-voltage DC contactor;

[0051] (5) After the charger obtains the high-voltage input, under the power supply of A+A-, the drive circuit controls the operation of the post-stage DCDC of the charger to make the DC bus voltage of the charger reach the predetermined value;

[0052] (6) The low-voltage drive power supply inside the charger board is powered on, the diode D cuts off the power supply of the auxiliary power supply 1, and the internal power supply of the charger is taken over by the DC bus;

[0053] (7) The charger is ready for discharge.

[0054] As Figure 1 shown, an internal power supply architecture of a charger includes an isolated low-voltage auxiliary power supply 1 powered by an A+A- interface. The output end of the auxiliary power supply 1 includes a diode D; the isolated low-voltage auxiliary power supply can supply power to the power tube drive circuit and other related control circuits inside the charger; after the DC bus inside the charger is powered on, the isolated low-voltage auxiliary power supply can be taken over and the isolated low-voltage auxiliary power supply can stop supplying power.

Claims

1. A discharge control method for a non-vehicle two-way charger, characterized in that, It includes the following steps: (1) After the vehicle interface is plugged into the charging gun, the vehicle performs connection status detection; (2) After the vehicle detects good plugging, it controls A+A- to supply low voltage to the charger; (3) The charger performs plugging status detection; (4) After both parties confirm good plugging, the vehicle performs insulation detection; (5) The vehicle sends the insulation detection result to the charger. When the insulation detection passes, the vehicle-charger continues handshake interaction; if the insulation detection fails, after receiving the detection result, the charger aborts the discharging process and issues an alarm; (6) After the insulation detection passes, the charger closes the DC-side contactor; (7) The vehicle's DC high-voltage terminal outputs externally; (8) The charger powers on at high voltage, and the DC bus takes over the A+A- power supply; (9) The vehicle stops supplying power to A+A-; (10) The charger is ready; When adopting the said discharging control method, the control timing inside the charger is specifically as follows: (1) A+A- supplies power to the isolated low-voltage auxiliary power supply inside the charger, and the low-voltage control circuit inside the charger powers on; (2) The charger completes the gun-end connection status detection; (3) The charger waits for the vehicle insulation detection result; (4) After the charger obtains the result that the insulation detection passes, it closes the high-voltage DC contactor; (5) After the charger obtains high-voltage input, under the power supply of A+A-, the drive circuit controls the operation of the charger's post-stage DCDC to make the DC bus voltage of the charger reach a predetermined value; (6) The low-voltage drive power supply inside the charger board powers on, the diode D cuts off the power supply of the isolated low-voltage auxiliary power supply, and the internal power supply of the charger is taken over by the DC bus; (7) The charger is ready for discharging.

2. A computer storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements a discharging control method for a non-vehicle-mounted bidirectional charger as described in claim 1.

3. A computer device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements a discharging control method for a non-vehicle-mounted bidirectional charger as described in claim 1.

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