阅读说明：本技术 高压开关的控制电路及其方法、电池管理系统和车辆 (Control circuit and method of high-voltage switch, battery management system and vehicle ) 是由 康斌 陈东 于 2020-05-22 设计创作，主要内容包括：本发明公开了一种高压开关的控制电路及其方法、电池管理系统和车辆,所述高压开关的控制电路,包括控制单元、定时单元、锁存单元和驱动单元。控制单元用于发送高压吸合信号给锁存单元,锁存单元锁存高压吸合信号,以使驱动单元控制高压开关吸合；控制单元还用于在发生复位时发送开始定时信号给定时单元,以及,控制单元还用于在复位恢复后输出解除定时信号给定时单元；定时单元用于响应于开始定时信号开始计时,若未接收到解除定时信号,定时单元计时溢出,定时单元发送清除锁存信号给锁存单元；锁存单元接收到清除锁存信号则清除高压吸合信号,以使驱动单元控制高压开关断开。该电路可以在控制单元复位失败后控制高压开关断开,提高安全性。(The invention discloses a control circuit of a high-voltage switch, a control method of the control circuit, a battery management system and a vehicle. The control unit is used for sending a high-pressure pull-in signal to the latch unit, and the latch unit latches the high-pressure pull-in signal so as to enable the driving unit to control the high-pressure switch to pull in; the control unit is also used for sending a starting timing signal timing unit when reset occurs, and the control unit is also used for outputting a releasing timing signal timing unit after reset recovery; the timing unit is used for responding to the starting timing signal to start timing, and if the timing releasing signal is not received, the timing unit times over, and the timing unit sends a latch clearing signal to the latch unit; the latch unit clears the high-pressure pull-in signal after receiving the clearing latch signal, so that the driving unit controls the high-pressure switch to be switched off. The circuit can control the high-voltage switch to be switched off after the control unit fails to reset, and safety is improved.)

1. The control circuit of the high-voltage switch is characterized by comprising a control unit, a timing unit, a latch unit and a driving unit, wherein the control unit is respectively connected with the timing unit and the latch unit, the timing unit is connected with the latch unit, and the latch unit is connected with the driving unit;

the control unit is used for sending a high-pressure pull-in signal to the latch unit, and the latch unit latches the high-pressure pull-in signal so that the driving unit controls the high-pressure switch to pull in;

the control unit is also used for sending a starting timing signal to the timing unit when the reset occurs, and the control unit is also used for outputting a releasing timing signal to the timing unit after the reset is completed;

the timing unit is used for responding to a timing signal to start timing, and if the timing signal is not received, the timing unit times over, and the timing unit sends a latch clearing signal to the latch unit;

and the latch unit clears the high-voltage pull-in signal after receiving the clearing latch signal, so that the driving unit controls the high-voltage switch to be switched off.

2. The control circuit of a high voltage switch according to claim 1,

the control unit comprises a first port, a second port and a third port;

the first port is connected with the latch unit to send the high-pressure pull-in signal;

the second port is connected with the timing unit to send the start timing signal;

the third port is connected to the timing unit to transmit the release timing signal.

3. The control circuit of a high voltage switch according to claim 1,

the control unit comprises a first port, a second port and a third port, the first port is connected with the latch unit to send the high-pressure suction signal, and the second port is connected with the timing unit to send the timing releasing signal;

the control circuit further comprises a monitoring unit, the monitoring unit comprises a fourth port and a fifth port, the fourth port is connected with the third port of the control unit to receive the starting timing signal, the fifth port is connected with the timing unit to receive the starting timing signal, and the monitoring unit is used for triggering the timing unit to start timing according to the starting timing signal.

4. The control circuit of claim 1, wherein the timing unit is further configured to de-time the timing signal if the timing de-assertion signal is received within a timing overflow threshold, so that the latch unit keeps latching the high-voltage pull-in signal.

5. The control circuit of a high-voltage switch according to claim 1, wherein the timing overflow threshold T of the timing unit satisfies: t is more than or equal to 0.1s and less than or equal to 100 s.

6. A battery management system comprising a control circuit for a high voltage switch according to any of claims 1 to 5, the control circuit being adapted to control the high voltage switch when the control unit is reset.

7. A vehicle, characterized by comprising:

a battery system including a high voltage switch;

the battery management system of claim 6, the battery management system to control the high voltage switch.

8. The vehicle of claim 7, wherein the battery system comprises at least one of a low voltage battery system and a high voltage battery system.

9. A control method of a high voltage switch, for a control circuit of a high voltage switch including a control unit, a timing unit, a latch unit, and a driving unit, the method comprising:

when the control unit is reset, a starting timing signal is sent to the timing unit to trigger the timing unit to start timing;

when the control unit is reset abnormally, the timing unit does not receive timing releasing signals within a timing overflow threshold value, the timing unit is overflowed in a timing mode, so that the latch unit clears high-pressure suction signals, and the driving unit controls a high-pressure switch of the battery system to be disconnected.

10. The method of claim 9, further comprising:

after the control unit is reset, a timing releasing signal is sent to the timing unit so that the timing unit releases timing;

the latch unit continues to latch the high-pressure pull-in signal.

11. The method of claim 9, further comprising:

when the control unit is reset, a high-pressure suction signal is sent to the latch unit before the reset, and the latch unit latches the high-pressure suction signal, so that the drive unit controls the suction of the high-pressure switch.

Technical Field

The invention relates to the technical field of vehicles, in particular to a control circuit of a high-voltage switch, a battery management system, a vehicle and a control method of the high-voltage switch.

Background

The physical quantity of the Battery is monitored by a Battery Management System (BMS) on the electric vehicle to ensure the safe operation of the Battery. The battery physical quantity detection includes: cell voltage, cell temperature, total battery voltage, and current. When the load system requests power-off, the BMS controls a high voltage switch (HV switch) to disconnect the battery from the load/charging device, so as to achieve high voltage safety, wherein a control terminal of the high voltage switch usually selects a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) to drive, and the MCU (micro controller Unit) controls the MOSFET to drive. When the electric automobile is in the operation process, if the high-voltage switch is suddenly disconnected, the user experience can be directly influenced.

In the related art, in order to prevent the high-voltage switch from being unexpectedly turned off, some schemes control the MOSFET circuit by selecting a state latching device, so as to avoid the requirement of holding the high-voltage switch when the MCU is reset. However, when the MCU fails to reset, or even the MCU is locked, and cannot be recovered by resetting, the high voltage switch needs to be turned off, but the latch function of the latch will hold the high voltage switch, so that the high voltage switch cannot be turned off, which results in an unsafe state. Or, in some schemes, the high-voltage switch is controlled to be turned off in a delayed manner when the MCU is reset by using a scheme of capacitance delay of the MCU and a Circuit Breaker (CB). However, when the MCU cannot be reset successfully within the capacitor delay, the circuit breaker still cannot meet the requirement of delayed disconnection.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a control circuit for a high voltage switch, which can control the high voltage switch to be turned off after the control unit fails to reset, thereby improving safety.

The embodiment of the second aspect of the invention provides a battery management system.

An embodiment of a third aspect of the invention provides a vehicle.

The embodiment of the fourth aspect of the invention provides a control method of a high-voltage switch.

In order to solve the above problem, a control circuit of a high voltage switch according to an embodiment of a first aspect of the present invention includes a control unit, a timing unit, a latch unit, and a driving unit, where the control unit is connected to the timing unit and the latch unit respectively, the timing unit is connected to the latch unit, and the latch unit is connected to the driving unit; the control unit is used for sending a high-pressure pull-in signal to the latch unit, and the latch unit latches the high-pressure pull-in signal so that the driving unit controls the high-pressure switch to pull in; the control unit is also used for sending a starting timing signal to the timing unit when the reset occurs, and the control unit is also used for outputting a releasing timing signal to the timing unit after the reset is completed; the timing unit is used for responding to a timing signal to start timing, and if the timing signal is not received, the timing unit times over, and the timing unit sends a latch clearing signal to the latch unit; and the latch unit clears the high-voltage pull-in signal after receiving the clearing latch signal, so that the driving unit controls the high-voltage switch to be switched off.

According to the control circuit of the high-voltage switch of the embodiment of the invention, based on the arrangement of the timing unit and the latch unit, when the control unit is reset, the control unit sends a high-voltage attraction signal to enable the latch unit to latch the high-voltage attraction signal and control the high-voltage switch to keep the attraction state, and when the control unit is reset, the control unit outputs a starting timing signal to the timing unit to control the timing unit to start timing, and the control unit outputs a timing releasing signal to the timing unit after the reset is finished, so that the timing unit overflows when the timing unit does not receive the timing releasing signal, namely the control unit fails to reset, the timing unit outputs a latch clearing signal to the latch unit to enable the latch unit to clear the high-voltage attraction signal, the drive unit controls the high-voltage switch to be disconnected, namely the control unit clears the latch state in the latch unit when the normal state, namely the reset fails, can not be recovered within the timing time, the drive unit drives the high-voltage switch to be disconnected, so that the function of controlling the high-voltage switch to be disconnected after the control unit fails to reset is realized, and the safety of high-voltage use is improved.

In some embodiments, the control unit comprises: a first port, a second port, and a third port; the first port is connected with the latch unit to send the high-pressure pull-in signal; the second port is connected with the timing unit to send the start timing signal; the third port is connected to the timing unit to transmit the release timing signal.

In some embodiments, the control unit comprises: the first port is connected with the latch unit to send the high-pressure pull-in signal, and the second port is connected with the timing unit to send the timing releasing signal; the control circuit further comprises a monitoring unit, the monitoring unit comprises a fourth port and a fifth port, the fourth port is connected with the third port of the control unit to receive the starting timing signal, the fifth port is connected with the timing unit to receive the starting timing signal, and the monitoring unit is used for triggering the timing unit to start timing according to the starting timing signal.

In some embodiments, the timing unit is further configured to release the timing upon receiving the release timing signal within a timing overflow threshold, so that the latch unit keeps latching the high-voltage pull-in signal.

In some embodiments, the timing overflow threshold T of the timing unit satisfies: t is more than or equal to 0.1s and less than or equal to 100 s.

In a second aspect, an embodiment of the present invention provides a battery management system, including the control circuit of the high voltage switch in the above embodiment, where the control circuit is configured to control the high voltage switch when the control unit is reset.

According to the battery management system provided by the embodiment of the invention, the control circuit of the high-voltage switch provided by the embodiment is adopted, so that the function of controlling the high-voltage switch to be switched off when the control unit fails to reset can be realized, and the safety of high-voltage use is improved.

An embodiment of a third aspect of the invention provides a vehicle comprising: a battery system including a high voltage switch; in the battery management system according to the above embodiment, the battery management system is configured to control the high-voltage switch.

According to the vehicle provided by the embodiment of the invention, the battery management system provided by the embodiment can realize the function of controlling the high-voltage switch to be switched off when the control unit fails to reset, so that the safety of high-voltage use is improved.

In some embodiments, the battery system comprises at least one of a low voltage battery system and a high voltage battery system.

A fourth aspect of the present invention provides a control method for a control circuit including a control unit, a timing unit, a latch unit, and a driving unit, the method including: when the control unit is reset, a starting timing signal is sent to the timing unit to trigger the timing unit to start timing; when the control unit is reset abnormally, the timing unit does not receive timing releasing signals within a timing overflow threshold value, the timing unit is overflowed in a timing mode, so that the latch unit clears high-pressure suction signals, and the driving unit controls a high-pressure switch of the battery system to be disconnected.

According to the control method of the high-voltage switch, based on the setting of the timing unit in the control circuit of the high-voltage switch, when the control unit is reset, the control unit sends the start timing signal to the timing unit to trigger the timing unit to start timing, and further when the control unit is reset abnormally, the timing unit is within the timing overflow threshold, the control unit does not send the timing release signal to the timing unit, namely when the control unit fails to reset, the timing unit overflows in timing, so that the latch unit clears the latch state, and the high-voltage switch is controlled to be disconnected, so that the function of controlling the high-voltage switch to be disconnected when the control unit fails to reset is realized, and the safety of high-voltage use is improved.

In some embodiments, the method further comprises: after the control unit is reset, a timing releasing signal is sent to the timing unit, so that the timing unit releases timing, and the latch unit continues to latch the high-pressure suction signal.

In some embodiments, the method further comprises: when the control unit is reset, a high-pressure suction signal is sent to the latch unit before the reset, so that the latch unit latches the high-pressure suction signal, and the driving unit controls the suction of the high-pressure switch.

Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a block diagram of a control circuit for a high voltage switch according to one embodiment of the present invention;

fig. 2 is a block diagram of a control circuit of a high voltage switch according to another embodiment of the present invention;

fig. 3 is a block diagram of a control circuit of a high voltage switch according to another embodiment of the present invention;

FIG. 4 is a block diagram of a battery management system according to one embodiment of the present invention;

FIG. 5 is a block diagram of a vehicle according to an embodiment of the invention;

fig. 6 is a flow chart of a method of controlling a high voltage switch according to one embodiment of the present invention.

Reference numerals:

a vehicle 100;

a high-voltage switch control circuit 10; a battery management system 20; a battery system 30;

a control unit 1; a timing unit 2; a latch unit 3; a drive unit 4; a high-voltage switch 5;

a monitoring unit 12.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

In order to solve the above problem, a control circuit of a high voltage switch according to an embodiment of the first aspect of the present invention is described below with reference to the drawings, and the control circuit can control the high voltage switch to be turned off after a reset failure of a control unit, thereby improving safety.

The control circuit of the high-voltage switch in the embodiment of the invention can be used for a low-voltage battery system and a high-voltage battery system, in practical application, the disconnecting switch of the low-voltage battery system is called a breaker, the disconnecting switch of the high-voltage battery system is called a high-voltage switch, and for convenience of expression, the disconnecting switches of the two types of battery systems are collectively called the high-voltage switch in the embodiment of the invention.

Fig. 1 is a block diagram of a control circuit of a high-voltage switch according to an embodiment of the present invention, and as shown in fig. 1, a high-voltage switch control circuit 10 according to an embodiment of the present invention includes a control unit 1, a timing unit 2, a latch unit 3, and a driving unit 4.

The control unit 1 is respectively connected with the timing unit 2 and the latch unit 3, the timing unit 2 is connected with the latch unit 3, and the latch unit 3 is connected with the driving unit 4; the control unit 1 is used for sending a high-pressure pull-in signal to the latch unit 3, and the latch unit 3 latches the high-pressure pull-in signal so that the driving unit 4 controls the high-pressure switch to pull in; the control unit 1 is also used for sending a start timing signal setting unit 2 when reset occurs, and the control unit 1 is also used for outputting a release timing signal setting unit 2 after reset is completed; the timing unit 2 is used for starting timing in response to the starting timing signal, and if the timing releasing signal is not received, the timing unit 2 overflows the timing and sends a latch clearing signal to the latch unit 3; the latch unit 3 clears the high-voltage pull-in signal after receiving the clearing latch signal, so that the driving unit 4 controls the high-voltage switch to be switched off.

When the high-voltage switch normally operates, the control unit 1 controls the high/low level signal output by the latch unit 3 to control the driving unit 4 to output high/low level, and further control the on/off of the high-voltage switch. If the control unit 1 is reset, the control unit 1 sends a high-pressure suction signal to the latch unit 3, and the latch unit 3 keeps the output state unchanged, namely, the high-pressure suction signal is latched, so that the high-pressure switch keeps suction. If the control unit 1 cannot recover to normal operation after being reset, the high-voltage switch needs to be disconnected so as to improve safety. Therefore, in the embodiment of the present invention, as shown in fig. 1, when the control unit 1 is reset, the control unit 1 is further configured to output a start timing signal, and output a release timing signal after the reset is completed; the timing unit 2 is connected with the control unit 1 and used for starting timing in response to a timing starting signal, overflowing timing if a timing releasing signal is not received, and outputting a clearing latch signal to the latch unit 3; the latch unit 3 is connected with the control unit 1 and the timing unit 2 respectively, and is used for clearing the high-voltage pull-in signal when receiving the clearing latch signal, so that the drive unit 4 connected with the latch unit 3 controls the high-voltage switch to be disconnected.

In the embodiment, when the control unit is reset but cannot recover normal operation, the high-voltage switch needs to be turned off to ensure high-voltage safety, but because the high-voltage switch is already kept in an attraction state by the latch unit and cannot be turned off at this time, the circuit 10 of the embodiment of the invention additionally arranges a timing unit 2 on the basis of keeping the high-voltage switch state by the latch unit 3, sets a reset signal of the control unit 1 as a trigger signal of the timing unit 2, namely the timing unit 2 starts timing in response to the reset signal, so that in the timing process of the timing unit 2, the timing unit 2 waits for the control unit 1 to be reset, further the timing unit 2 judges whether the control unit 1 can normally operate after being reset by the timing duration, and after the timing duration exceeds the maximum value, namely when the timing unit 2 times over, the control unit 1 cannot recover normal operation by resetting, the timing unit 2 outputs a clearing latch signal to enable the latch unit 3 to clear the high-voltage suction signal so as to disconnect the high-voltage switch, thereby realizing the function of controlling the disconnection of the high-voltage switch when the control unit 1 fails to reset and improving the safety of high-voltage use.

The maximum value can be understood as the time for allowing the high-voltage switch to be turned off in a delayed manner, that is, the time for allowing the control unit 1 to be reset, and the timing duration of the timing unit 2 exceeds the maximum value, that is, the timing overflows, that is, it can be determined that the control unit 1 cannot be restored to normal operation by resetting.

In the embodiment, when an unexpected reset occurs, the circuit 10 of the embodiment of the present invention controls the driving unit 4 to adjust the high-voltage switch by using a manner that the timing unit 2 and the latch unit 3 are combined, specifically, the control unit 1 sends a start timing signal to the timing unit 2 to trigger the timing unit 2 to start timing, and the control unit 1 sends a high-voltage pull-in signal to the latch unit 3, and the latch unit 3 latches the high-voltage pull-in signal, so that the driving unit 4 controls the high-voltage switch to maintain the pull-in state. In the resetting process, whether the control unit 1 can normally operate after being reset is diagnosed through the timing unit 2, when the timing unit 2 times over, it is determined that the control unit 1 cannot restore the normal operation through resetting, the control unit 1 cannot send a timing releasing signal, the timing unit 2 outputs a latch clearing signal to the latch unit 3, the latch unit 3 clears a high-voltage suction signal, and the driving unit 4 controls the high-voltage switch to be switched off.

In an embodiment, before the timing does not overflow, that is, after the timing unit 2 receives the release timing signal within the timing overflow threshold, that is, after the control unit 1 can resume normal operation by completing reset, the control unit 1 outputs the release timing signal, and the timing unit 2 releases timing in response to the release timing signal, so that the latch unit 3 keeps latching the high-voltage pull-in signal. That is, when the control unit 1 returns to normal by resetting, the control unit 1 controls the timing unit 2 to count time, the output state of the timing unit 2 does not change, the latch state of the latch unit 3 is not cleared, the output state of the driving unit 4 does not change, and the high-voltage switch remains closed.

Therefore, in the circuit 10 according to the embodiment of the present invention, by combining the timing unit 2 and the latch unit 3, on one hand, the control unit 1 can directly control the latch unit 3, and the latch unit 3 is used to keep the high-voltage switch in the pull-in state, on the other hand, the timing unit 2 is used to keep the high-voltage switch in the delay state, and when the control unit 1 cannot restore to normal operation through reset, the latch unit 3 can be triggered by the timing unit 2 to turn off the high-voltage switch, so that the problem that the high-voltage switch cannot be turned off when the control unit 1 fails to reset is solved, and the function that the high-voltage switch is turned off when the control unit 1 fails to reset and is delayed is realized. In addition, the circuit 10 of the embodiment of the present invention realizes the function of controlling the high voltage switch to be turned off when the reset of the control unit 1 fails by additionally arranging the timing unit 2, the control logic is simple, and the cost of the timing unit 2 is low, so that the circuit of the embodiment of the present invention does not increase too much cost, and the area of the circuit board is increased less.

According to the control circuit 10 of the high-voltage switch of the embodiment of the invention, based on the arrangement of the timing unit 2 and the latch unit 3, when the control unit 1 is reset, the control unit 1 sends a high-voltage attraction signal to enable the latch unit to latch the high-voltage attraction signal and control the high-voltage switch to keep the attraction state, and when the control unit 1 is reset, the control unit 1 outputs a timing starting signal to the timing unit 2 to control the timing unit 2 to start timing, and the control unit 1 outputs a timing releasing signal to the timing unit 2 after the reset is completed, so that the timing unit 2 overflows when the timing releasing signal is not received, namely when the control unit 1 fails to reset, the timing unit 2 outputs a latch clearing signal to the latch unit 3 to enable the latch unit 3 to clear the high-voltage attraction signal, the driving unit 4 controls the high-voltage switch to be switched off, namely when the control unit 1 cannot recover to a normal state within a fixed time, namely fails to reset, the latch state in the latch unit 3 is cleared, so that the driving unit 4 drives the high-voltage switch to be switched off, the function of controlling the high-voltage switch to be switched off after the control unit 1 fails to reset is realized, and the safety of high-voltage use is improved.

In some embodiments, as shown in fig. 2, the control unit 1 comprises a first port a, a second port b and a third port c. The first port a of the control unit 1 is connected with the latch unit 3 to send a high-pressure pull-in signal; the second port b of the control unit 1 is connected with the timing unit 2 to transmit a start timing signal; the third port c of the control unit 1 is connected to the timing unit 2 to transmit a release timing signal.

As shown in fig. 2, the control unit 1 controls the latch unit 3 to control the driving of the high voltage switch 5, so as to switch on and off the high voltage switch 5, meanwhile, the latch unit 3 is also controlled by the timing unit 2, and the control unit 1 triggers the timing unit 2 to count time on one hand and releases the timing unit 2 to count time on the other hand. Specifically, the control unit 1 normally controls the latch unit 3 to turn on or off the driving unit 4 through the first port a, and the driving unit 4 further controls the control terminal of the high voltage switch 5. When the control unit 1 is reset, the control unit 1 sends a start timing signal to the timing unit 2 through the second port b, and triggers the timing unit 2 to start timing. The timing unit 2 waits for the reset result of the control unit 1, if the control unit 1 is successfully reset, the control unit 1 needs to send a timing releasing signal to the timing unit 2 through the third port c, the timing unit 2 triggers the timing to be released, and does not send any signal value to the latch unit 3, and the latch unit 3 keeps the control output state unchanged, so that the attraction state of the high-voltage switch 5 is kept; if the control unit 1 fails to reset, the timing unit 2 does not receive a timing releasing signal from the control unit 1, the timing unit 2 waits for timing overflow, and then sends a latch clearing signal to the latch unit 3, once the state of the lock cylinder of the latch unit 3 is cleared, the output of the latch unit 3 is restored to a default state, the drive unit 4 is also restored to the default state, and the high-voltage switch 5 is restored to an off state.

In other embodiments, as shown in fig. 3, the control unit 1 includes a first port a, a second port b and a third port c, the first port a of the control unit 1 is connected to the latch unit 3 to transmit the high-voltage pull-in signal, and the second port b of the control unit 1 is connected to the timing unit 2 to transmit the release timing signal.

And, the circuit 10 of the embodiment of the present invention further includes a monitoring unit 12, where the monitoring unit 12 includes a fourth port d and a fifth port e, as shown in fig. 3, the fourth port d of the monitoring unit 12 is connected to the third port c of the control unit 1 and is configured to receive the start timing signal, the fifth port e of the monitoring unit 12 is connected to the timing unit 2 and is configured to receive the start timing signal, and the monitoring unit 12 is configured to trigger the timing unit 2 to start timing according to the start timing signal.

As shown in fig. 3, the monitoring unit 12 triggers the timing unit 2 to count time, the monitoring unit 12 is used to monitor the operation state of the control unit 1, and if the control unit 1 operates abnormally, the monitoring unit 12 controls the control unit 1 to reset. When the control unit 1 operates normally, the latch unit 3 is controlled by the first port a to control the driving of the high-voltage switch 5, so that the on-off of the high-voltage switch 5 is realized, and meanwhile, the latch unit 3 is also controlled by the timing unit 2. When the control unit 1 is reset, the monitoring unit 12 triggers the timing unit 2 to time through the fifth port e, and if the control unit 1 is reset successfully, the timing is released through the second port b. Specifically, the control unit 1 normally controls the latch unit 3 to turn on or off the driving unit 4 through the first port a, and the driving unit 4 further controls the control terminal of the high voltage switch 5. When the control unit 1 is reset, the control unit 1 sends a start timing signal through the third port c, the fifth port e of the monitoring unit 12 is triggered simultaneously with the start timing signal, and the fifth port e of the monitoring unit 12 triggers the timing unit 2 to start timing. The timing unit 2 waits for the control unit 1 to reset the result. If the control unit 1 is successfully reset, the control unit 1 needs to send a timing releasing signal to the timing unit 2 through the second port b, the timing unit 2 triggers timing to be released, the latch unit 3 cannot send any signal value, and the latch unit 3 keeps the control output state unchanged, so that the attraction state of the high-voltage switch 5 is kept; if the control unit 1 fails to reset, the timing unit 2 does not receive a timing releasing signal from the control unit 1, the timing unit 2 waits for timing overflow, and then outputs a clearing latch signal to the latch unit 3, once the state of the lock cylinder of the latch unit 3 is cleared, the latch unit 3 outputs and restores to a default state, the driving unit 4 restores to the default state, and the high-voltage switch 5 restores to an off state.

In an embodiment, the monitoring unit 12 may be a System Based Chip (SBC).

That is, in the embodiment of the present invention, the control unit 1 resets the signal as the trigger signal for triggering the timing unit 2 to time. The control unit 1 reset signal may be issued by the control unit 1 itself, or may be issued by a chip, such as an SBC, monitoring the control unit 1. The SBC monitors the operation and reset of the control unit 1, and can trigger the control unit 1 to reset, and when detecting that the control unit 1 is reset or triggers the control unit 1, the SBC can simultaneously send a signal for triggering the timing unit 2 to time through the port.

In an embodiment, the time for holding the high-voltage switch in the delayed manner depends on the timing unit 2, the timing duration of the timing unit 2 can be configured by an external circuit, the time range for disconnecting the high-voltage switch in the delayed manner can be adjusted according to actual requirements, and the control mode is more flexible and changeable, for example, the timing overflow threshold T of the timing unit 2 can be set to satisfy: 0.1s ≦ T ≦ 100s, for example, the timing overflow threshold of the timing unit 2 may be configured to be 0.5s, 30s, or 70s, etc.

Therefore, the embodiment of the invention fully considers two situations of unexpected reset success and failure of the control unit 1, and when the control unit 1 is reset successfully, the state of the high-voltage switch is required not to be changed; when the control unit 1 fails to reset, the high-voltage switch is required to be turned off in a delayed manner, and the delay time can be adjusted, so that the circuit 10 in the embodiment of the invention is additionally provided with a timing unit, thereby not only solving the problem that the high-voltage switch cannot be turned off when the control unit fails, but also realizing the function of turning off the high-voltage switch in a delayed manner when the control unit fails, and having simple control logic.

In a second embodiment of the present invention, a battery management system is provided, as shown in fig. 4, a battery management system 20 of the embodiment of the present invention includes the control circuit 10 of the high voltage switch provided in the above embodiment, and the control circuit 10 is configured to control the high voltage switch when the control unit is reset.

According to the battery management system 20 of the embodiment of the invention, by adopting the control circuit 10 of the high-voltage switch provided by the embodiment, the function of controlling the high-voltage switch to be switched off when the control unit fails to reset can be realized, and the safety of high-voltage use is improved.

In a third embodiment of the present invention, a vehicle is provided, and as shown in fig. 5, a vehicle 100 according to an embodiment of the present invention includes a battery system 30 and the battery management system 20 according to the above-described embodiment.

The battery system 30 includes a high-voltage switch 5, and the battery management system 20 is configured to control the high-voltage switch 5. Therefore, in the running process of the vehicle 100, if unexpected reset occurs, the battery management system 20 can control the high-voltage switch 5 to keep in an attraction state, after the reset is recovered, the battery management system 20 recovers a normal control flow of the high-voltage switch 5, and if the unexpected reset fails, the battery management system 20 can control the high-voltage switch to be turned off in a delayed manner, so that high-voltage danger is avoided.

According to the vehicle 100 of the embodiment of the invention, by adopting the battery management system 20 provided by the embodiment, the function of controlling the high-voltage switch to be switched off when the control unit fails to reset can be realized, and the safety of high-voltage use is improved.

In some embodiments, the battery system 30 includes at least one of a low voltage battery system and a high voltage battery system.

A fourth embodiment of the present invention provides a control method of a high voltage switch, for a control circuit of a high voltage switch including a control unit, a timing unit, a latch unit and a driving unit, as shown in fig. 6, the method of the embodiment of the present invention includes at least steps S1-S2.

In step S1, when the control unit is reset, the control unit sends a start timing signal to the timing unit to trigger the timing unit to start timing.

In the embodiment, when the control unit is reset but cannot recover normal operation, the high-voltage switch needs to be turned off to ensure high-voltage safety, but because the high-voltage switch is already kept in an attraction state by the latch unit and cannot be turned off at this time, the embodiment of the invention additionally provides a timing unit based on the fact that the latch unit keeps the high-voltage switch state, and a reset signal is set as a trigger signal of the timing unit, so that when the control unit is reset, a start timing signal is sent to trigger the timing unit to start timing, and in the timing process of the timing unit, the control unit is waited to be reset, that is, whether the control unit can normally operate after being reset is judged by the timing unit.

And step S2, when the control unit is reset abnormally, the timing unit does not receive timing releasing signals within the timing overflow threshold value, the timing unit counts the time and overflows, so that the latch unit clears the high-pressure suction signals, and the driving unit controls the high-pressure switch of the battery system to be switched off.

In the embodiment, the timing unit judges whether the control unit can normally operate after reset according to the timing duration, when the control unit cannot restore the normal operation through reset, namely when the reset is abnormal, the control unit cannot send a timing releasing signal, the timing unit overflows when accounting, the timing unit outputs a clearing latch signal to the latch unit, the latch unit clears a high-voltage suction signal, the driving unit controls the high-voltage switch to be switched off, the function of controlling the high-voltage switch to be switched off when the control unit fails to reset is realized, and the safety of high-voltage use is improved.

According to the control method of the high-voltage switch, based on the setting of the timing unit in the control circuit of the high-voltage switch, when the control unit is reset, the control unit sends the start timing signal to the timing unit to trigger the timing unit to start timing, and further when the control unit is reset abnormally, the timing unit is within the timing overflow threshold, the control unit does not send the timing release signal to the timing unit, namely when the control unit fails to reset, the timing unit overflows in timing, so that the latch unit clears the latch state, and the high-voltage switch is controlled to be disconnected, so that the function of controlling the high-voltage switch to be disconnected when the control unit fails to reset is realized, and the safety of high-voltage use is improved.

In an embodiment, the method of the embodiment of the present invention further includes: after the control unit is reset, a timing releasing signal is sent to the timing unit, so that the timing unit releases timing, and the latch unit continues to latch the high-pressure suction signal. That is, if the control unit returns to normal through resetting, the control unit controls the timing unit to release timing, the output state of the timing unit is not changed, the latch state of the latch unit is not cleared, the output state of the driving unit is not changed, and the high-voltage switch is kept in a closed state.

In an embodiment, the method of the embodiment of the present invention further includes: when the control unit is reset, a high-pressure suction signal is sent to the latch unit before the control unit is reset, so that the latch unit latches the high-pressure suction signal, and the driving unit controls the high-pressure switch to suck. That is, when the control unit is reset, the control unit sends a high-pressure pull-in signal to the latch unit, so that the high-pressure switch keeps a pull-in state, and the function of delaying disconnection of the high-pressure switch when the control unit is reset is realized.

In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.