阅读说明：本技术 一种双控保护型高压控制电路 (Double-control protection type high-voltage control circuit ) 是由 许杰 吴晓峰 高纪凡 冯玟生 于 2021-01-29 设计创作，主要内容包括：本发明提供了一种双控保护型高压控制电路,包括依次连接的双控单元、处理单元和控制高压接入和断开的双刀双掷继电器K1,所述双控单元包括通信连接的控制单元A和控制单元B,控制单元A和控制单元B分别单独控制双刀双掷继电器K1线圈的一极；所述处理单元包括可以接收双控单元输出控制信号的反相器,所述反相器的输出信号通过输入到MOS管控制双刀双掷继电器K1；所述处理单元还包括与控制单元连接的反馈信号检测电路。本发明通过两个不同的控制单元改变继电器线圈两侧的电压,保证继电器工作在合理范围内和长期运行的可靠性；两个控制单元可单独控制继电器线圈的一极,可实现故障后迅速断开控制信号,确保高压通断安全。(The invention provides a double-control protection type high-voltage control circuit which comprises a double-control unit, a processing unit and a double-pole double-throw relay K1, wherein the double-control unit, the processing unit and the double-pole double-throw relay K1 are sequentially connected, the double-control unit comprises a control unit A and a control unit B which are in communication connection, and the control unit A and the control unit B respectively and independently control one pole of a coil of a double-pole double-throw relay K1; the processing unit comprises an inverter which can receive the output control signal of the double control unit, and the output signal of the inverter is input to a MOS (metal oxide semiconductor) tube to control a double-pole double-throw relay K1; the processing unit further comprises a feedback signal detection circuit connected with the control unit. The invention changes the voltage at two sides of the relay coil through two different control units, thereby ensuring the reliability of the relay working in a reasonable range and long-term operation; the two control units can independently control one pole of the relay coil, so that the control signal can be quickly cut off after a fault, and the safety of high-voltage on-off is ensured.)

1. A double-control protection type high-voltage control circuit is characterized by comprising a double-control unit, a processing unit and a double-pole double-throw relay K1, wherein the double-control unit, the processing unit and the double-pole double-throw relay K1 are sequentially connected, the double-control unit comprises a control unit A and a control unit B which are in communication connection, and the control unit A and the control unit B respectively and independently control one pole of a coil of a double-pole double-throw relay K1; the processing unit comprises an inverter which can receive the output control signal of the double control unit, and the output signal of the inverter is input to a MOS (metal oxide semiconductor) tube to control a double-pole double-throw relay K1; the processing unit further comprises a feedback signal detection circuit connected with the control unit.

2. The dual-control protection type high-voltage control circuit as claimed in claim 1, wherein the control unit a outputs a control signal to an inverter D1, the inverter D1 outputs a level signal to a MOS transistor V2, and the level state of pin 1 of the double-pole double-throw relay K1 is controlled by controlling the state of the MOS transistor V2.

3. The dual-control protection type high-voltage control circuit according to claim 1, wherein the processing unit further comprises a dual-frequency non-retriggerable monostable multivibrator D3 connected to the control unit B, and the dual-frequency non-retriggerable monostable multivibrator D3 has a reset function.

4. The dual-control protection type high-voltage control circuit as claimed in claim 3, wherein the control signal outputted from the control unit B is connected to an inverter D2 and a dual-frequency nonremovable monostable multivibrator D3, the inverter D2 and the dual-frequency nonremovable monostable multivibrator D3 output level signals to MOS transistors, and the level state of the 12 pin of the double-pole double-throw relay K1 is controlled by controlling the state of the MOS transistors.

5. The dual-control protection type high-voltage control circuit according to claim 4, wherein the duration of the output level signal pulse of the dual-frequency non-retriggerable monostable multivibrator D3 is determined by an RC frequency generator consisting of a resistor R7 and a capacitor C2.

6. The dual-control protection type high-voltage control circuit according to claim 4, wherein when the control signal output by the control unit B is at a low level, the dual-frequency non-retriggerable monostable multivibrator D3 outputs a high-level pulse to drive the MOS transistor V10 to be conducted to the ground, so as to enable the MOS transistor V8 to be conducted, and the start power VCC _ H2 is input to the 12 pin of the double-pole double-throw relay K1 through the anti-reverse diode V5, so that the 12 pin of the double-pole double-throw relay K1 is at a high level; meanwhile, the inverter D2 outputs a high level signal to the MOS transistor V6 to drive the conduction of the MOS transistor V6 to be grounded, so that the MOS transistor V3 is conducted, the power supply VCC _ H1 is input to the 12 pin of the double-pole double-throw relay K1 through the anti-reverse diode V5, and the 12 pin of the double-pole double-throw relay K1 maintains a high level.

7. The dual-control protection type high-voltage control circuit according to claim 6, wherein when the control signal output by the control unit B is at a high level or no output level, the dual-frequency non-retriggerable monostable multivibrator D3 is at a low level, the MOS transistor V10 is at a cut-off state, and the pin 12 of the double-pole double-throw relay K1 is at a floating state; meanwhile, the inverter D2 outputs a low level signal, the MOS transistor V6 is in a cut-off state, and the 12 pin of the double-pole double-throw relay K1 is in a floating state.

8. The dual-control protection type high-voltage control circuit as claimed in claim 7, wherein the voltage value of the power supply VCC _ H1 is smaller than that of the start power supply VCC _ H2.

9. The dual-control protection type high-voltage control circuit according to claim 1, wherein the control unit A and the control unit B perform communication and data interaction through a serial port, and/or SPI, and/or CAN.

10. The dual-control protection type high-voltage control circuit according to claim 1, wherein the control signals output by the control unit a and the control unit B are respectively connected to a power supply through a connection pull-up resistor.

Technical Field

The invention belongs to the technical field of high-voltage control in an energy storage battery management system, and particularly relates to a double-control protection type high-voltage control circuit.

Background

In the automation equipment, the output control of the relay is adopted to realize weak current control and strong current control, thereby realizing the driving operation of external strong current equipment. At present, in a battery system in the energy storage industry, a battery master control management system BCU is generally adopted to control a total negative relay and a total positive relay for single-point control, if a BCU control circuit is short-circuited or a CPU program is in an abnormal operation state in the control process, the relay cannot be normally disconnected, the battery system is overdischarged or overcharged, and finally, a failure that cannot be recovered and even explosion of a battery pack may be caused.

Disclosure of Invention

The invention aims to solve the problems and provides a double-control protection type high-voltage control circuit which can quickly cut off a control signal after a fault, ensure the safety of high-voltage on-off and ensure the reliability and safety of long-term operation of a relay.

In order to achieve the purpose, the invention adopts the following technical scheme:

a double-control protection type high-voltage control circuit comprises a double-control unit, a processing unit and a double-pole double-throw relay K1, wherein the double-control unit, the processing unit and the double-pole double-throw relay K1 are sequentially connected, the double-control unit comprises a control unit A and a control unit B which are in communication connection, and the control unit A and the control unit B respectively and independently control one pole of a coil of a double-pole double-throw relay K1; the processing unit comprises an inverter which can receive the output control signal of the double control unit, and the output signal of the inverter is input to a MOS (metal oxide semiconductor) tube to control a double-pole double-throw relay K1; the processing unit further comprises a feedback signal detection circuit connected with the control unit. The invention changes the voltage at two sides of the relay coil through two different control units, thereby ensuring the reliability of the relay working in a reasonable range and long-term operation; the two control units can independently control one pole of the relay coil, so that the control signal can be quickly cut off after a fault occurs, the data of the two control units can be interacted in real time, mutual information knowledge is realized, and the situation that the battery pack is overcharged or overdischarged, cannot recover due to the fact that the relay cannot be normally cut off when the relay is abnormally operated and even explodes is prevented.

Further, the control unit a outputs a control signal to the inverter D1, the inverter D1 outputs a level signal to the MOS transistor V2, and the level state of the pin 1 of the double-pole double-throw relay K1 is controlled by controlling the state of the MOS transistor V2. When the control signal output by the control unit a is at a low level, the inverter D1 outputs a high level signal to drive the NMOS transistor V2 to be turned on, so that the pin 1 of the double-pole double-throw relay K1 assumes a low level. When the control signal output by the control unit a is at a high level or not, the inverter D1 outputs a low level signal, and at this time, the NMOS transistor V2 is turned off, so that the pin 1 of the double-pole double-throw relay K1 is in a floating state, and the relay cannot normally operate.

Further, the processing unit further comprises a dual-frequency non-retriggerable monostable multivibrator D3 connected to the control unit B, the dual-frequency non-retriggerable monostable multivibrator D3 having a reset function.

Further, the control signal output by the control unit B is connected to the inverter D2 and the dual-frequency nonretriggerable monostable multivibrator D3, the inverter D2 and the dual-frequency nonretriggerable monostable multivibrator D3 output level signals to the MOS transistor, and the level state of the 12 pin of the double-pole double-throw relay K1 is controlled by controlling the state of the MOS transistor.

Further, the duration of the output level signal pulse of the dual-frequency non-retriggerable monostable multivibrator D3 is determined by an RC frequency device formed by a resistor R7 and a capacitor C2.

Further, when the control signal output by the control unit B is at a low level, the dual-frequency non-retriggerable monostable multivibrator D3 outputs a high level pulse to drive the MOS transistor V10 to be conducted to the ground, so as to enable the MOS transistor V8 to be conducted, and the start power VCC _ H2 is input to the 12 pin of the double-pole double-throw relay K1 through the anti-reverse diode V5, so that the 12 pin of the double-pole double-throw relay K1 presents a high level; meanwhile, the inverter D2 outputs a high level signal to the MOS transistor V6 to drive the conduction of the MOS transistor V6 to be grounded, so that the MOS transistor V3 is conducted, the power supply VCC _ H1 is input to the 12 pin of the double-pole double-throw relay K1 through the anti-reverse diode V5, and the 12 pin of the double-pole double-throw relay K1 maintains a high level. When the 12 pin of the double-pole double-throw relay K1 maintains high level and the 1 pin shows low level, the double-pole double-throw relay K1 will act, the double-pole double-throw switch will switch positions, the high voltage HV _ I will be connected to the high voltage HV _ O, and the feedback signal REY _ FB-N is received by the control unit B at low level, thereby judging that the relay has normally operated and the high voltage has normally connected.

Further, when the control signal output by the control unit B is at a high level or no output level, the dual-frequency non-retriggerable monostable multivibrator D3 is in a low level state, the MOS transistor V10 is in a cut-off state, and the 12 pin of the double-pole double-throw relay K1 is in a suspended state; meanwhile, the inverter D2 outputs a low level signal, the MOS transistor V6 is in a cut-off state, the 12 pin of the double-pole double-throw relay K1 is in a suspended state, and the double-pole double-throw relay K1 cannot work normally. When the 12 pin of the double-pole double-throw relay K1 is in a suspended state or the 1 pin of the double-pole double-throw relay K1 is in a suspended state, the double-pole double-throw relay K1 does not act, the double-pole double-throw switch returns to the initial position, the high voltage HV _ I cannot be connected to the high voltage HV _ O, and the feedback signal is received by the control unit B at a high level, so that the relay is judged to be disconnected or not acting, and the high voltage is normally disconnected or not connected.

Further, the power supply VCC _ H1 has a voltage value smaller than that of the startup power supply VCC _ H2. Through the mode of switching the relay power supply, the relay can be maintained in a low power consumption state, so that the relay is not overheated, and the reliability of long-term operation of the relay is ensured.

Further, the control unit A and the control unit B carry out communication and data interaction through a serial port and/or SPI and/or CAN. The control unit A and the control unit B realize data interaction and information mutual awareness through serial port communication, so that the state of the relay is monitored and controlled in real time.

Furthermore, the control signals output by the control unit are respectively connected to the power supply through connecting pull-up resistors.

Compared with the prior art, the invention has the advantages that:

1. according to the invention, one path of the double-pole double-throw relay can smoothly connect and disconnect high voltage, and the other path can feed back whether the high voltage is normally connected and disconnected in real time, so that the control unit can monitor the connection and disconnection of the high voltage in real time;

2. two poles of a coil of the relay are respectively controlled by two independent control units, so that the relay can be normally disconnected by the other control unit under the condition that one control unit fails, and the high-voltage on-off safety is ensured;

3. the relay is driven by large voltage pulses, and the design of a medium voltage maintaining function can reduce the power consumption of a coil of the relay, prevent the phenomenon that contacts are adhered due to heating of the relay in the long-term electrifying process, shorten the service life of the relay and ensure the reliability and safety of the long-term operation of the relay;

4. the two independent control units are communicated through a serial port, so that data interaction and information mutual knowledge are realized, and the state of the relay can be monitored and controlled in real time;

5. the invention is designed with a feedback signal detection circuit, and is connected with the control unit, so that the high-voltage on-off state of the relay can be detected in real time, and the out-of-control can not be caused.

Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.

Drawings

Fig. 1 is a circuit diagram of the dual-control protection type high-voltage control circuit of the invention.

Detailed Description

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.

As shown in fig. 1, a dual-control protection type high-voltage control circuit includes a dual-control unit, a processing unit, and a double-pole double-throw relay K1 for controlling the connection and disconnection of high voltage, the dual-control unit includes a control unit a and a control unit B which are connected in communication, and the control unit a and the control unit B respectively and independently control one pole of a coil of the double-pole double-throw relay K1; the processing unit comprises an inverter which can receive a control signal output by the control unit, and the output signal of the inverter is input to a MOS (metal oxide semiconductor) tube to control a double-pole double-throw relay K1; the processing unit further comprises a feedback signal detection circuit connected with the control unit. The invention changes the voltage at two sides of the relay coil through two different control units, thereby ensuring the reliability of the relay working in a reasonable range and long-term operation; the two control units can independently control one pole of the relay coil, so that the control signal can be quickly cut off after a fault occurs, the data of the two control units can be interacted in real time, mutual information awareness is realized, the situation that the relay cannot be normally cut off when the relay is abnormally operated is prevented, the battery pack is overcharged or overdischarged, and the battery pack is subjected to unrecoverable fault and even explosion.

The control unit a of this embodiment outputs a control signal to the inverter D1, the inverter D1 outputs a level signal to the MOS transistor V2, controls the state of the MOS transistor V2, and controls the level state of the pin 1 of the double-pole double-throw relay K1.

The control signal output by the control unit B is connected to an inverter D2 and a double-frequency nonretriggerable monostable multivibrator D3 with a reset function, the inverter D2 and the double-frequency nonretriggerable monostable multivibrator D3 output level signals to a MOS transistor to control the state of the MOS transistor, and the level state of a 12 pin of a double-pole double-throw relay K1 is controlled. The method specifically comprises the following steps: the double-frequency non-retriggerable monostable multivibrator D3 outputs a level signal to an MOS tube V10, controls the state of an MOS tube V10, when the MOS tube V10 is conducted, the MOS tube V8 is conducted, a start power VCC _ H2 subjected to voltage division and stabilization is input to a pin 12 of a double-pole double-throw relay K1 through an anti-reverse diode V5, and the pin 12 of the double-pole double-throw relay K1 is at a high level; the inverter D2 outputs a level signal to the MOS tube V6 to control the state of the MOS tube V6, the MOS tube V6 is conducted to enable the MOS tube V3 to be conducted, the divided and stabilized power supply VCC _ H1 is input to the 12 pin of the double-pole double-throw relay K1 through the anti-reverse diode V5, and the 12 pin of the double-pole double-throw relay K1 maintains high level. When the MOS transistor V10 is in a cut-off state, the 12 feet of the double-pole double-throw relay K1 are suspended; the MOS transistor V6 is in a cut-off state, and the 12 feet of the double-pole double-throw relay K1 are suspended.

In this embodiment, the duration of the output level signal pulse of the dual-frequency non-retriggerable monostable multivibrator D3 is determined by the RC frequency device composed of the resistor R7 and the capacitor C2.

The specific control process of this embodiment is as follows:

the control unit A outputs a control signal REY1_ EN-N which is connected with a pull-up resistor R1 to a power supply VCC _ LV, when the control signal REY1_ EN-N output by the control unit A is in a low level and is input into a pin 2 of an inverter D1, a pin 4 of the inverter D1 outputs a high level signal which is input into a grid electrode of an NMOS tube V2 through a current-limiting resistor R2 to control the V2 to be conducted, and therefore a pin 1 of the relay K1 is enabled to be in a low level. In this embodiment, the inverter D1 is 74LVC1G04, the NMOS transistor V2 is 2N7002, and the power VCC _ LV is +5V dc power.

The control unit B outputs a control signal REY2_ EN-N which is connected to the pin 2 of the inverter D2 and the pin 1 of the dual-frequency non-retriggerable monostable multivibrator D3 with a reset function, and is connected with a pull-up resistor R9 to a power supply VCC _ LV; the 2 pin and the 16 pin of the monostable multivibrator D3 are connected with a power supply VCC _ LV, the 8 pin and the 14 pin are grounded, a resistor R7 and a capacitor C2 are connected between the 15 pin and the 14 pin to form an RC frequency device, the 3 pin is connected with the grid electrode of an NMOS tube V6, and the 13 pin is connected with the grid electrode of an NMOS tube V10.

When the control signal REY2_ EN-N output by the control unit B is at low level, the output end 13 pin of the dual-frequency non-retriggerable monostable multivibrator D3 with the reset function outputs a high-level pulse, the duration of the pulse is determined by an RC frequency device formed by a resistor R7 and a capacitor C2, the high-level pulse drives an NMOS tube V10 to be conducted, a voltage dividing resistor R10 is grounded, a PMOS tube V8 is conducted, at the moment, after the power supply VCC _ HV2 passes through the voltage dividing resistors R8 and R10 and a voltage stabilizing diode V9, the stabilized voltage is input to the 12 pin of the relay K1 through an anti-reverse diode V5, and the 12 pin of the relay K1 is enabled to be at high level. The diode V5 and the diode V7 are BAV70W, the monostable multivibrator D3 is 74HCT221, the NMOS tube V10 is 2N7002, the PMOS tube V8 is BSP171, the zener diode V9 is MM3Z16VT1G, the R7 is 100K resistor, the C2 is 4.7uF capacitor, the divider resistor R8 is 22K, the R10 is 10K, and the power supply VCC _ HV2 is +24V direct current power supply.

When pin 1 of the relay K1 is low and pin 12 is high, the relay K1 will be energized to start working and its double pole double throw switch will switch positions. At this time, pin 4 of the relay K1 is switched to pin 5, the high voltage HV _ I is connected to the high voltage HV _ O, and the voltage-sensitive protection element R5, the absorbing element high voltage capacitor C1 and the resistor R6 are added between the high voltage sides HV _ I and HV _ O. Meanwhile, the pin 9 of the relay K1 is switched to the pin 8, and the feedback signal REY _ FB-N before being switched is obtained by dividing the voltage of the power supply VCC _ HV2 by the voltage dividing resistors R11 and R12, so that the feedback signal REY _ FB-N is at a high level at the moment; when the switch is performed, the feedback signal REY _ FB-N is pulled down, and the feedback signal REY _ FB-N is at a low level. The level change of the feedback signal REY _ FB-N is received and obtained by the control unit B, so that whether the relay normally operates or not is known. The relay K1 is SR2M-V23047-A1024-A501, the piezoresistor R5 is B72650M0141K072, the high-voltage capacitor C1 is 4.7nF/2kV, the resistor R6 is 47 omega, and the voltage dividing resistors R11 and R12 are 100K and 15K respectively.

After the control signal REY2_ EN-N output by the control unit B is at low level, the monostable multivibrator D3 outputs a high level pulse to prompt the relay K1 to start normally, and meanwhile, the REY2_ EN-N signal is also input to the pin 2 of the inverter D2, the pin 4 of the inverter D2 outputs a high level signal which is input to the grid of the NMOS tube V6 to control the V6 to be conducted to the ground to prompt the PMOS tube V3 to be conducted, at this time, after the power supply VCC _ HV1 passes through the voltage dividing resistors R3 and R4 and the voltage stabilizing diode V4, the voltage after voltage stabilization is input to the pin 12 of the relay K1 through the anti-reverse diode V5, so that the pin 12 of the relay K1 maintains at high level. The NMOS transistor V6 is 2N7002, the PMOS transistor V3 is BSP171, the voltage stabilizing diode V4 is MM3Z16VT1G, the voltage dividing resistor R3 is 22K, the voltage dividing resistor R4 is 10K, and the power supply VCC _ HV1 is +15V direct current power supply.

When the 12 feet of the relay K1 maintain high level and the 1 foot of the relay is low level, the relay maintains the conducting action state, at the moment, because the voltage value of the power supply VCC _ HV1 is smaller than that of the starting power supply VCC _ HV2, the current flowing through the coil of the relay K1 is reduced, the power consumption of the coil can be effectively reduced, the phenomenon of contact adhesion caused by the fact that the relay is in a long-term conducting state is prevented, and the effect of protecting the relay is achieved.

The control unit B and the control unit A realize data interaction through serial port communication (the communication mode CAN be but is not limited to a serial port, other communication modes CAN also be adopted such as SPI, CAN and the like), high and low levels are output through control signals REY1_ EN-N and REY2_ EN-N, and the potential change of two sides of a relay coil CAN be controlled, so that the connection and disconnection of external high voltage are realized, and whether the external high voltage is normally connected and disconnected is judged through the high and low levels of a feedback signal REY _ FB-N.

When the control unit A or the control unit B detects that the fault occurs, the control unit A or the control unit B can output a high-level signal to disconnect the self-control end and also can inform the other side of disconnecting the control end in a communication mode. The control end of the relay is accurately disconnected by only one party, so that the accurate disconnection of the external high voltage can be ensured, and the high voltage safety is ensured.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.