CN203005111U - Delayed power-off device for electric vehicle - Google Patents

Abstract

The utility model discloses a delayed power-off device for an electric vehicle and aims to provide the delayed power-off device for the electric vehicle, which can carry out delayed power-off control on a vehicle controller of the electric vehicle so as to reach a power-off time sequence between controllers. The delayed power-off device for the electric vehicle comprises a vehicle controller, a transistor, a relay, an ignition switch and a storage battery; the relay comprises a coil end and a contact end; the transistor is provided with three pins; three pins of the transistor are respectively connected with the vehicle controller, one end of the coil end of the relay and the ground; the vehicle controller is respectively connected with one end of the contact end of the relay and one end of the ignition switch; and the other end of the ignition switch, the other end of the contact end of the relay and the other end of the coil end of the relay are all connected with the storage battery. The delayed power-off device for the electric vehicle has the benefit that the vehicle controller of the electric vehicle can be subjected to delayed power-off control, so as to reach the power-off time sequence between the controllers and enable the vehicle to be normally started next time.

Description

Delayed power-off device for electric vehicles

technical field

The utility model relates to an electronic control circuit device for automobiles, in particular to a time-delay power-off device for electric automobiles.

Background technique

Electric vehicle controllers are generally powered by 12V lead-acid batteries. After the high voltage is cut off, the lead-acid battery cannot be recharged. Then, the vehicle controller must be powered off to reduce the energy consumption of the lead-acid battery, otherwise it may cause the 12V lead-acid battery to feed power, so that the vehicle cannot be started next time. However, due to the power-off logic relationship of the electric vehicle control system, if the battery management system is powered off first, the motor controller is next, and the vehicle controller is last, the electric vehicle controller must be equipped with a device to control the power-off time To meet the power-off sequence requirements. In the prior art, the time-delay power-off device is generally arranged on the PCB board of the controller, but this will increase the layout space and size of the PCB board, and the power is small, and the greater the power, the greater the space requirement.

Chinese patent authorization announcement number: CN 202225747Y, the date of authorization announcement was May 23, 2012, which discloses a delayed power-off circuit, which includes a battery, a key door switch and a clutch controller, and it also includes a detection relay, a control relay, No. 1 diode and No. 2 diode, the moving end of the key door switch is connected to the positive pole of the battery, and the static end of the key door switch is connected to the anode of the No. 1 diode and one end of the control coil of the detection relay at the same time; the cathode of the No. 1 diode At the same time, it is connected with the cathode of the second diode and the positive power input terminal of the clutch controller. The disadvantage of the utility model is that it is only suitable for the automatic reset of the clutch when the key door switch is disconnected, and it cannot control the delayed power-off of the electric vehicle controller, thereby failing to reach the The sequence of power outages may cause the 12V lead-acid battery to feed power, so that the vehicle cannot be started next time.

Utility model content

The utility model aims to overcome the inability of the electric vehicle controller in the prior art to perform delayed power-off control, so that the power-off sequence between the controllers cannot be achieved, which may cause the 12V lead-acid battery to feed power, so that the vehicle cannot be powered on next time. Insufficiency of start-up provides an electric vehicle delayed power-off device capable of performing delayed power-off control on the controllers of the electric vehicle so as to achieve the power-off sequence among the controllers.

In order to achieve the above object, the utility model adopts the following technical solutions:

A delayed power-off device for an electric vehicle, comprising a vehicle controller, a transistor, a relay, an ignition switch and a storage battery, the relay includes a coil end and a contact end, the transistor has three legs, and the three legs of the transistor Each pin is respectively connected to the vehicle controller, one end of the coil end of the relay and the ground, the vehicle controller is respectively connected to one end of the contact end of the relay and one end of the ignition switch, the other end of the ignition switch, the contact of the relay The other end of the terminal and the other end of the coil end of the relay are connected to the storage battery.

The driver turns on the ignition switch through the key, and the storage battery supplies power to the vehicle controller through the ignition switch, so that the vehicle controller starts to work normally. The vehicle controller outputs a high level to control the conduction of the transistor, so that the coil end of the relay is turned on, and the contact end of the relay is controlled to conduct through the coil end of the relay, so that the battery is supplied to the vehicle through the contact end of the relay at the same time. The controller supplies power, so that the vehicle controller starts to work normally. When the driver turns off the ignition switch with the key, if the vehicle controller needs to continue to work, it is necessary to start the delay power-off device, and the vehicle controller continues to output a high level to control the conduction of the transistor, so that the coil terminal of the relay continues to turn on. After being switched on, the coil end of the relay is used to continue to control the conduction of the contact end of the relay, so that the battery supplies power to the vehicle controller through the contact end of the relay, and the delay power-off start. This design satisfies the need to perform delayed power-off control on the controllers used in electric vehicles, so as to achieve the purpose of power-off sequence between the controllers.

Preferably, the contact end of the relay is a normally open contact end, the power supply end of the vehicle controller is connected to one end of the ignition switch and one end of the contact end of the relay, and the digital output end of the vehicle controller is connected to Transistor, the positive pole of the storage battery is respectively connected to the other end of the ignition switch, the other end of the contact end of the relay and the other end of the coil end of the relay, the negative pole of the storage battery is grounded, and the vehicle control is continued through the normally open contact end of the relay. The inverter provides the power supply of the battery, so as to meet the requirement of delayed power failure.

Preferably, the transistor is a triode, and the triode is a current-driven component. It is relatively easy to debug the circuit. The triode can be welded to the PCB board of the vehicle controller or connected to the wiring harness of the vehicle without increasing the PCB space of the vehicle controller. and size.

Preferably, the base of the triode is connected to the vehicle controller, the collector of the triode is connected to one end of the coil end of the relay, the emitter of the triode is grounded, and the conduction and shutdown of the triode are controlled by the base of the triode. .

Preferably, the transistor is an NMOS transistor, which is a voltage-driven component that can be driven with a small power, has a small resistance when turned on, and has good temperature characteristics. Self-excited, static power consumption is very small.

Preferably, the gate of the NMOS transistor is connected to the vehicle controller, the drain of the NMOS transistor is connected to one end of the coil end of the relay, the source of the NMOS transistor is grounded, and the NMOS transistor is controlled by the gate of the NMOS transistor. On and off, the NMOS tube can be soldered to the PCB board of the vehicle controller or connected to the vehicle wiring harness, without increasing the PCB space and size of the vehicle controller.

The beneficial effects of the utility model are: it is possible to carry out delayed power-off control on the controllers of electric vehicles, so as to achieve the power-off sequence between the controllers, without causing the 12V lead-acid battery to feed power, so that the vehicle can operate normally next time Start; the transistor can be soldered to the PCB board of the vehicle controller or connected on the vehicle wiring harness, without increasing the PCB space and size of the vehicle controller.

Description of drawings

Fig. 1 is a block diagram of the utility model;

Fig. 2 is the schematic circuit diagram of the utility model embodiment one;

Fig. 3 is a schematic circuit diagram of the second embodiment of the utility model.

In the figure: 1. Vehicle controller, 2. Transistor, 3. Relay, 4. Ignition switch, 5. Battery, 6. Contact terminal, 7. Coil terminal, 8. Transistor, 9. NMOS tube.

Detailed ways

Below in conjunction with accompanying drawing and specific embodiment, the utility model is further described.

Embodiment 1: In the embodiment as shown in Fig. 1 and Fig. 2, a delayed power-off device for an electric vehicle includes a vehicle controller 1, a transistor 2, a relay 3, an ignition switch 4 and a storage battery 5, the described The relay 5 includes a coil end 7 and a contact end 6. The transistor 2 has three legs, and the three legs of the transistor 2 are respectively connected to the vehicle controller 1, one end of the coil end 7 of the relay 3 and the ground. The vehicle controller 1 is respectively connected to one end of the contact end 6 of the relay 3 and one end of the ignition switch 4, the other end of the ignition switch 4, the other end of the contact end 6 of the relay 3 and the other end of the coil end 7 of the relay 3. Connect the battery 5. Wherein: the transistor 2 is a triode 8, the base of the triode 8 is connected to the vehicle controller 1, the collector of the triode 8 is connected to the coil end 7 of the relay 3, and the emitter of the triode 8 is grounded. The contact end 6 of the relay 3 is a normally open contact end, and the power supply end of the vehicle controller 1 is connected to one end of the ignition switch 4 and one end of the contact end 6 of the relay 3. The digital output terminal is connected to the base of the triode 8, the positive pole of the storage battery 5 is respectively connected to the other end of the ignition switch 4, the other end of the contact terminal 6 of the relay 3 and the other end of the coil terminal 7 of the relay 3, and the negative pole of the storage battery 5 grounded. Wherein: the ignition switch 4 includes "ON" gear, "ACC" gear and "OFF" gear, the power ground terminal of the vehicle controller 1 is grounded, and the battery 5 is a 12V battery.

The working principle is as follows: the driver turns the key to the "ON" position of the ignition switch 4, at this time the power terminal of the vehicle controller 1 is connected to the positive pole of the 12V battery, and the vehicle controller 1 starts to work normally, and then the vehicle control The digital signal terminal of the device 1 outputs a high level to the base of the triode 8, so that the triode 8 is turned on, so that the coil terminal 7 of the relay 3 is connected, and the contact terminal 6 of the relay 3 is also connected through the coil terminal 7 of the relay 3 Turn on, so the whole relay 3 is turned on, at this time the power supply of the vehicle controller 1 comes from the parallel circuit of the ignition switch 4 and the relay 3; the driver turns the key to the "ACC" or "OFF" position of the ignition switch 4 , although the power line passing through the ignition switch 4 is cut off, the power line passing through the contact terminal 6 of the relay 3 is not cut off, but is controlled by the digital output terminal of the vehicle controller 1, as long as the voltage output by the digital output terminal If the level is high, the relay 3 is always on. At this time, the power supply terminal of the vehicle controller 1 can continue to be powered by the 12V battery through the contact terminal 6 of the relay 3, and the delayed power-off is turned on. If the voltage output by the digital output terminal level is low level, then the relay 3 is disconnected, and the delayed power-off ends.

Embodiment 2: In the embodiment as shown in Fig. 1 and Fig. 3, a delayed power-off device for an electric vehicle includes a vehicle controller 1, a transistor 2, a relay 3, an ignition switch 4 and a storage battery 5, the described The relay 5 includes a coil end 7 and a contact end 6. The transistor 2 has three legs, and the three legs of the transistor 2 are respectively connected to the vehicle controller 1, one end of the coil end 7 of the relay 3 and the ground. The vehicle controller 1 is respectively connected to one end of the contact end 6 of the relay 3 and one end of the ignition switch 4, the other end of the ignition switch 4, the other end of the contact end 6 of the relay 3 and the other end of the coil end 7 of the relay 3. Connect the battery 5. Wherein: the transistor 2 is an NMOS tube 9, the gate of the NMOS tube 9 is connected to the vehicle controller 1, the drain of the NMOS tube 9 is connected to one end of the coil terminal 7 of the relay 3, and the NMOS tube 9 is Source ground. The contact end 6 of the relay 3 is a normally open contact end, and the power end of the vehicle controller 1 is connected to one end of the ignition switch 4 and one end of the contact end 6 of the relay 3. The digital output terminal is connected to the grid of the NMOS tube 9, and the positive pole of the storage battery 5 is respectively connected to the other end of the ignition switch 4, the other end of the contact terminal 6 of the relay 3, and the other end of the coil terminal 7 of the relay 3. Negative ground. Wherein: the ignition switch 4 includes "ON" gear, "ACC" gear and "OFF" gear, the power ground terminal of the vehicle controller 1 is grounded, and the battery 5 is a 12V battery.

The working principle is as follows: the driver turns the key to the "ON" position of the ignition switch 4, at this time the power terminal of the vehicle controller 1 is connected to the positive pole of the 12V battery, and the vehicle controller 1 starts to work normally, and then the vehicle control The digital signal terminal of the device 1 outputs a high level to the grid of the NMOS tube 9, so that the NMOS tube 9 is turned on, so that the coil terminal 7 of the relay 3 is connected, and the contact terminal of the relay 3 is connected through the coil terminal 7 of the relay 3. 6 is also turned on, so the entire relay 3 is turned on. At this time, the power supply of the vehicle controller 1 comes from the parallel circuit of the ignition switch 4 and the relay 3; the driver turns the key to the "ACC" gear of the ignition switch 4 or "OFF". ” gear, although the power line passing through the ignition switch 4 is cut off, the power line passing through the contact terminal 6 of the relay 3 is not cut off, but is controlled by the digital output terminal of the vehicle controller 1, as long as the digital output terminal outputs If the voltage is high, the relay 3 is always on. At this time, the power supply terminal of the vehicle controller 1 can continue to be powered by the 12V battery through the contact terminal 6 of the relay 3, and the delayed power-off is turned on. If the digital output terminal outputs If the level is low level, the relay 3 is disconnected, and the delayed power-off ends.

Claims (6)

1. A delayed power-off device for an electric vehicle, characterized in that it includes a vehicle controller (1), a transistor (2), a relay (3), an ignition switch (4) and a storage battery (5), and the relay (3) Including the coil end (7) and the contact end (6), the transistor (2) has three legs, and the three legs of the transistor (2) are respectively connected to the vehicle controller (1), the relay ( 3) one end of the coil end (7) and the ground, the vehicle controller (1) is respectively connected to one end of the contact end (6) of the relay (3) and one end of the ignition switch (4), and the ignition switch ( The other end of 4), the other end of the contact end (6) of the relay (3) and the other end of the coil end (7) of the relay (3) are all connected to the battery (5). 2. A delayed power-off device for electric vehicles according to claim 1, characterized in that the contact end (6) of the relay (3) is a normally open contact end (6), and the contact end (6) for the vehicle The power supply end of the controller (1) is connected to one end of the ignition switch (4) and the contact end (6) of the relay (3), and the digital output end of the vehicle controller (1) is connected to the transistor (2). The positive pole of the battery (5) is respectively connected to the other end of the ignition switch (4), the other end of the contact end (6) of the relay (3) and the other end of the coil end (7) of the relay (3), and the battery (5) ) negative terminal is grounded. 3. A delayed power-off device for electric vehicles according to claim 1 or 2, characterized in that the transistor (2) is a triode (8). 4. A delayed power-off device for electric vehicles according to claim 3, characterized in that the base of the triode (8) is connected to the vehicle controller (1), and the collector of the triode (8) Connect one end of the coil end (7) of the relay (3), and the emitter of the triode (8) is grounded. 5. A delayed power-off device for electric vehicles according to claim 1 or 2, characterized in that the transistor (2) is an NMOS transistor (9). 6. A delayed power-off device for electric vehicles according to claim 4, characterized in that the gate of the NMOS transistor (9) is connected to the vehicle controller (1), and the gate of the NMOS transistor (9) The drain is connected to one end of the coil terminal (7) of the relay (3), and the source of the NMOS tube (9) is grounded.

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