Delay power-off circuit of new energy automobile

Abstract

The utility model discloses a time-delay power-off circuit for a new energy automobile, and the circuit comprises a vehicle control unit which is provided with a B110 pin, a B120 pin, and a B119 pin. The first diode is arranged on the key power-on circuit and is used for preventing reverse conduction of the voltage output by the time-delay electric pin of the vehicle control unit; the second diode is used for preventing the key from being electrified and conducted to a delay control pin of the vehicle control unit; the control end of the vehicle control unit power supply relay is jointly controlled by the power-on of the key and the level output by the B120 pin of the vehicle control unit; and the control end of the integrated controller low-voltage power supply relay is controlled by the level output by the pin B119 of the vehicle control unit. According to the utility model, accurate time-delay power-off control of the vehicle control unit is realized, the safety and stability of the power-off process of the vehicle are improved, the circuit cost is reduced, and the reliability of the circuit is enhanced.

Description

Technical Field

[0001] This utility model relates to a delayed power-off circuit for new energy vehicles, belonging to the field of new energy vehicle technology. This circuit can be widely used in various new energy vehicles and new energy products driven by high-voltage power supplies controlled by low voltage. Background Technology

[0002] With the booming development of the new energy vehicle industry, its market share is constantly increasing. During the use of new energy vehicles, the safety and stability of the vehicle's power-off process are crucial. After the vehicle key power is switched off, it is necessary to ensure that the vehicle controller continues to operate for a period of time to control and confirm the smooth power-off operation of all high-voltage components, avoiding any safety hazards caused by residual electrical energy in the high-voltage components.

[0003] However, existing power-off technologies for new energy vehicles have some problems. Currently, most vehicles rely on the constant power supply from the battery to maintain the operation of the vehicle controller after the ignition key is switched off. Even after the vehicle controller completes the power-off command and enters sleep mode, its power cannot be completely cut off, resulting in static power consumption. This not only leads to rapid depletion of the low-voltage battery, shortening its lifespan, but may also cause the vehicle to fail to start normally the next time due to a depleted low-voltage battery, seriously affecting the user experience and vehicle safety. Utility Model Content

[0004] To address this issue, this utility model provides a delayed power-off circuit for new energy vehicles, which solves the problem of low-voltage batteries easily running out of power after the key power-off in existing technologies. This enables precise delayed power-off control of the vehicle controller, improves the safety and stability of the vehicle power-off process, and simultaneously reduces circuit costs and enhances circuit reliability.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a delayed power-off circuit for new energy vehicles, comprising:

[0006] A vehicle controller, wherein the vehicle controller has pins B110, B120, and B119;

[0007] The first diode is located in the key power-on circuit to prevent the voltage output from the delay pin of the vehicle controller from conducting in the reverse direction.

[0008] The second diode is used to prevent the key from conducting to the vehicle controller's delay control pin when powered on;

[0009] The power relay for the vehicle controller is controlled by the power-on of the key and the level output from pin B120 of the vehicle controller.

[0010] The integrated controller low-voltage power relay is controlled by the level output from pin B119 of the vehicle controller.

[0011] As a preferred solution for the delayed power-off circuit of new energy vehicles, both the first diode and the second diode are unidirectional diodes.

[0012] As a preferred solution for delayed power-off circuits in new energy vehicles, both the vehicle controller power relay and the integrated controller low-voltage power relay are electromagnetic relays.

[0013] As a preferred solution for delayed power-off circuits in new energy vehicles, it also includes a CAN communication bus and an integrated controller body. The vehicle controller interacts with the integrated controller body through the CAN communication bus.

[0014] As a preferred solution for delayed power-off circuits in new energy vehicles, the vehicle controller is equipped with a driver chip. When no high-level input is detected at pin B110, the driver chip controls pins B120 and B119 to output corresponding level signals.

[0015] As a preferred solution for delayed power-off circuits in new energy vehicles, a low-voltage battery is also included, which provides operating power to the vehicle controller, the vehicle controller power relay, and the integrated controller low-voltage power relay.

[0016] As a preferred solution for delayed power-off circuits in new energy vehicles, the B110 pin of the vehicle controller is used to detect the power-on status of the key.

[0017] This utility model has the following advantages:

[0018] The circuit design of this utility model can cut off the relevant power supply in a timely manner after the vehicle controller completes the power-down control of the high-voltage components and confirms that the power-down is completed, thereby avoiding the static power consumption of the vehicle controller in the sleep state, effectively extending the service life of the low-voltage battery, and reducing the starting problem of the vehicle caused by the low-voltage battery being depleted.

[0019] The first diode, second diode, vehicle controller power relay, and integrated controller low-voltage power relay used in the circuit are all conventional electronic components. These components are technologically mature, have stable performance, and are low in cost. Through a reasonable circuit layout and connection method, the components work together, greatly improving the reliability of the entire circuit, reducing the probability of circuit failure, and ensuring the safe operation of the vehicle.

[0020] The vehicle controller, through CAN communication with the integrated controller body, can obtain the power-off status of high-voltage components in real time, enabling precise control of the power-off process. The vehicle controller only stops operating after ensuring that the high-voltage components are completely de-energized, effectively avoiding safety hazards caused by residual electrical energy in the high-voltage components and improving the safety and stability of the vehicle's power-off process. Attached Figure Description

[0021] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the delayed power-off circuit structure for new energy vehicles provided in this embodiment of the utility model.

[0023] In the diagram, 1. Vehicle controller; 11. B110 pin; 12. B120 pin; 13. B119 pin; 14. Driver chip; 2. First diode; 3. Second diode; 4. Vehicle controller power relay; 5. Integrated controller low-voltage power relay; 6. CAN communication bus; 7. Integrated controller body; 8. Low-voltage battery. Detailed Implementation

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] See Figure 1 This utility model embodiment provides a delayed power-off circuit for new energy vehicles, including:

[0026] The vehicle controller 1 has a B110 pin 11, a B120 pin 12 and a B119 pin 13;

[0027] The first diode 2 is installed on the key power-on circuit to prevent the voltage output from the delay electrical pin of the vehicle controller 1 from conducting in reverse.

[0028] The second diode 3 is used to prevent the key from conducting to the delay control pin of the vehicle controller 1 when the key is powered on;

[0029] The power relay 4 for the vehicle controller is controlled by the power-on of the key and the level output from pin B120 of the vehicle controller 1.

[0030] The integrated controller low-voltage power relay 5 is controlled by the level output from the B119 pin of the vehicle controller 1.

[0031] Among them, the vehicle controller 1 is the core control component of the entire delayed power-down circuit, and has the following pins:

[0032] Pin 11 of B110: Used to detect the power-on status of the key. When the key is powered on, this pin can detect a high-level input; when the key is powered off, pin B110 cannot detect a high-level input.

[0033] Pin 12 of B120: Its output level signal is used to control the on / off state of the vehicle controller power relay 4. After the key is turned off, if no high-level input is detected at pin B110, the driver chip 14 inside the vehicle controller 1 will control pin B120 to output a corresponding level signal to maintain the closed state of the vehicle controller power relay 4 and ensure that the vehicle controller 1 continues to work.

[0034] Pin 13 of B119: The level signal output from this pin is used to control the operating state of the low-voltage power relay 5 of the integrated controller. Similarly, when the key is off and no high level is detected on pin B110, the driver chip 14 will control pin B119 to output the corresponding level, keeping the low-voltage power relay 5 of the integrated controller closed, ensuring that the integrated controller body 7 can continue to work.

[0035] Meanwhile, the vehicle controller 1 also contains a driver chip 14, which plays a role in logic control. When no high-level input is detected at pin B110, the driver chip 14 will control pins B120 and B119 to output corresponding level signals according to preset logic, thereby achieving precise control of the vehicle controller power relay 4 and the integrated controller low-voltage power relay 5.

[0036] In this embodiment, the first diode 2 is disposed on the key power-on circuit, and its main function is to prevent the voltage output from the delay pin of the vehicle controller 1 from conducting in the reverse direction. Since the first diode 2 is a unidirectional diode, it only allows current to flow in a specific direction, thereby preventing the voltage output from the delay pin of the vehicle controller 1 from flowing back into other circuit parts, ensuring the stability and reliability of the circuit. For example, during the delay operation of the vehicle controller 1, without the protection of the first diode 2, the voltage output from the delay pin might reversely affect the key power-on circuit or other related circuits, leading to circuit failure or malfunction.

[0037] The second diode 3 serves to prevent the key power-on signal from directly transmitting power to the delay control pin of the vehicle controller 1. As a unidirectional diode, it prevents the key power-on signal from directly affecting the delay control pin of the vehicle controller 1. This ensures that the delay control function of the vehicle controller 1 can execute independently and accurately, unaffected by the key power-on signal. For example, without the isolation provided by the second diode 3 after the key is de-energized, the residual signal from the key power-on might mistakenly trigger the delay control pin of the vehicle controller 1, causing the delay control function to fail.

[0038] In this embodiment, the control terminal of the vehicle controller power relay 4 is jointly controlled by the power-on state of the key and the output level of pin B120 of the vehicle controller 1. During normal vehicle operation, the key power-on state is high, causing the vehicle controller power relay 4 to close and providing power to the vehicle controller 1. When the key is de-energized, pin B110 detects the disappearance of the high level, and the driver chip 14 controls pin B120 to output a high level, maintaining the closed state of the vehicle controller power relay 4. This ensures that the vehicle controller 1 can continue to operate for a period of time after the key is de-energized, in order to complete the power-off control and monitoring tasks of the high-voltage system. Since this relay is an electromagnetic relay, it utilizes electromagnetic principles to achieve the closing and opening of contacts, offering advantages such as reliable operation and convenient control.

[0039] In this embodiment, a CAN communication bus 6 and an integrated controller body 7 are also included. The vehicle controller 1 interacts with the integrated controller body 7 through the CAN communication bus 6.

[0040] Specifically, the control terminal of the integrated controller's low-voltage power relay 5 is controlled by the level output from pin B119 of the vehicle controller 1. When the key is off and no high level is detected at pin B110, the driver chip 14 controls pin B119 to output a high level, causing the integrated controller's low-voltage power relay 5 to close, providing low-voltage operating power to the integrated controller body 7. The integrated controller body 7 is responsible for controlling and managing the vehicle's high-voltage system, executing the power-off operation of the high-voltage system under the command of the vehicle controller 1. After the high-voltage system is powered off, the vehicle controller 1 receives feedback information through the CAN communication bus 6, and the driver chip 14 controls pin B119 to stop outputting a high level, the integrated controller's low-voltage power relay 5 opens, and the integrated controller body 7 stops working. Similarly, this relay is also an electromagnetic relay, capable of stably and reliably controlling the circuit's on / off state.

[0041] The CAN communication bus 6 serves as the data exchange channel between the vehicle controller 1 and the integrated controller body 7. The vehicle controller 1 sends a power-off command to the integrated controller body 7 via the CAN communication bus 6. Upon receiving the command, the integrated controller body 7 controls the high-voltage system to power down. Simultaneously, after completing the power-down of the high-voltage system, the integrated controller body 7 sends power-down completion information back to the vehicle controller 1 via the CAN communication bus 6. This data exchange method based on the CAN communication bus 6 offers advantages such as high speed, reliability, and strong anti-interference capabilities, ensuring accurate and timely information transmission between the vehicle controller 1 and the integrated controller body 7, thereby achieving precise control of the high-voltage system power-down process.

[0042] In this embodiment, a low-voltage battery 8 is also included, which provides working power to the vehicle controller 1, the vehicle controller power relay 4, and the integrated controller low-voltage power relay 5.

[0043] Specifically, the low-voltage battery 8 provides operating power to the vehicle controller 1, the vehicle controller power relay 4, and the integrated controller low-voltage power relay 5. During vehicle operation and power-off, the low-voltage battery 8 consistently provides stable power to these critical components, ensuring their normal operation. For example, after the ignition is turned off, the low-voltage battery 8 supplies power to the vehicle controller 1 through the closed vehicle controller power relay 4, enabling the vehicle controller 1 to continue performing the delayed power-off control task; simultaneously, it supplies power to the integrated controller body 7 through the integrated controller low-voltage power relay 5, ensuring that the integrated controller body 7 can complete the power-off operation of the high-voltage system.

[0044] The working principle of this utility model is as follows:

[0045] I. Normal working status

[0046] When the key is powered on, the key power-on signal closes the vehicle controller power relay 4, and the low-voltage battery 8 supplies power to the vehicle controller 1. The vehicle controller 1 detects a high-level input at pin B110, and the vehicle controller 1 operates normally. At this time, the vehicle controller 1 outputs a corresponding level signal at pin B119, causing the integrated controller low-voltage power relay 5 to close, and the integrated controller body 7 receives low-voltage power and begins normal operation. The vehicle controller 1 interacts with the integrated controller body 7 via the CAN communication bus 6 to monitor and control the vehicle's operating status in real time.

[0047] II. Key power off state

[0048] When the key is de-energized, no high-level input is detected at pin B110 of the vehicle controller 1. The driver chip 14 inside the vehicle controller 1 immediately responds and controls pin B120 to output a high level. Due to the isolation effect of the second diode 3, the influence of the key being powered on is eliminated. Under the action of the high level output at pin B120, the power relay 4 of the vehicle controller remains closed, allowing the vehicle controller 1 to continue to draw power from the low-voltage battery 8 and maintain its operating state.

[0049] Simultaneously, the driver chip 14 controls pin B119 to output a high level, closing the low-voltage power relay 5 of the integrated controller, allowing the integrated controller body 7 to continue receiving low-voltage power and continue operation. The vehicle controller 1 sends a power-off command to the integrated controller body 7 via the CAN communication bus 6. Upon receiving the command, the integrated controller body 7 controls the relevant relays of the high-voltage system to disconnect, executing the power-off operation of the high-voltage system. After the integrated controller body 7 completes the high-voltage system power-off, it sends power-off completion information back to the vehicle controller 1 via the CAN communication bus 6. Upon receiving the feedback information, the vehicle controller 14 controls pin B119 to stop outputting a high level, the low-voltage power relay 5 of the integrated controller disconnects, and the integrated controller body 7 stops operating. Subsequently, the driver chip 14 controls pin B120 to stop outputting a high level, the vehicle controller power relay 4 disconnects, and the vehicle controller 1 stops operating, thus completing the vehicle power-off process.

[0050] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

Claims

1. A new energy vehicle delay power down circuit, characterized in that, The application relates to a vehicle controller (1) with a B110 pin (11), a B120 pin (12) and a B119 pin (13), a first diode (2) arranged on a key power-on circuit and used for preventing reverse conduction of voltage of a time-delay electric pin output of the vehicle controller (1), a second diode (3) used for preventing key power-on conduction to a time-delay control pin of the vehicle controller (1), a vehicle controller power supply relay (4) with a control end controlled by a key power-on and a level output by the B120 pin (12) of the vehicle controller (1), an integrated controller low-voltage power supply relay (5) with a control end controlled by a level output by the B119 pin (13) of the vehicle controller (1). The first diode (2) and the second diode (3) are unidirectional conduction diodes. The vehicle controller power supply relay (4) and the integrated controller low-voltage power supply relay (5) are electromagnetic relays. The vehicle controller (1) is internally provided with a driving chip (14) which controls the B120 pin (12) and the B119 pin (13) to output corresponding level signals when the B110 pin (11) does not detect high level input. The application further comprises a low-voltage storage battery (8) which provides working power supply for the vehicle controller (1), the vehicle controller power supply relay (4) and the integrated controller low-voltage power supply relay (5). The B110 pin (11) of the vehicle controller (1) is used for detecting the state of key power-on.

2. The new energy vehicle delay power-off circuit according to claim 1, characterized in that, ​ 3. The new energy vehicle delay power-off circuit according to claim 1, characterized in that, ​ 4. The new energy vehicle delay power-off circuit according to claim 1, characterized in that, ​ 5. The new energy vehicle delay power-off circuit according to claim 1, characterized in that, ​ 6. The new energy vehicle delay power-off circuit according to claim 1, characterized in that, ​ 7. The new energy vehicle delay power-off circuit according to claim 1, characterized in that, ​

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