CN215728549U

CN215728549U - New energy automobile high-voltage loop interlocking detection circuit

Info

Publication number: CN215728549U
Application number: CN202121673113.XU
Authority: CN
Inventors: 刘晓慧; 王恩鹏
Original assignee: Hengda Haila Electronics Yangzhou Co ltd
Current assignee: Hella Shanghai Electronics Co Ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-02-01
Anticipated expiration: 2031-07-22

Abstract

The utility model discloses a new energy automobile high-voltage loop interlocking detection circuit, which belongs to the technical field of new energy automobile battery management and comprises the following steps: the high-voltage part is provided with two high-voltage part loops, and equivalent circuits of a switch S1 and a switch S2 are respectively arranged in the two high-voltage part loops; and a BMS battery management system. The utility model is applied to a battery management system, adopts a hardware closed loop design, can effectively detect short power supply, short ground and open circuit faults on a high-voltage interlocking loop and has the recovery judgment of self output, a constant current source chip TPS92612 is used for outputting constant current 10mA, 7 resistors at the rear stage are connected in series to the ground, the current of a main loop is unchanged, when different resistances are connected in parallel, the divided voltage is different, and the connection state of the high-voltage interlocking loop is judged from the condition of resistor voltage division on the loop.

Description

New energy automobile high-voltage loop interlocking detection circuit

Technical Field

The utility model relates to the technical field of new energy automobile battery management, in particular to a new energy automobile high-voltage loop interlocking detection circuit.

Background

The high-voltage connection of the new energy automobile breaks down in the driving process, so that the automobile loses power, and the personal safety of adults can be damaged in serious conditions.

The high-voltage interlocking is used for judging the connection state of a high-voltage wire harness and a connector, and whether a short circuit or open circuit fault exists in the high-voltage loop interlocking can be effectively judged by adding a loop interlocking function in a battery management system, so that the damage caused by the high-voltage connection problem is avoided.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved

Aiming at the problems in the prior art, the utility model aims to provide a high-voltage loop interlocking detection circuit for a new energy automobile. The utility model adopts a hardware closed loop design, can effectively detect short power supply, short ground and open circuit faults on the high-voltage interlocking loop and has the function of judging the recovery of self output, a constant current source chip TPS92612 is used for outputting constant current of 10mA, 7 resistors at the rear stage are connected in series to the ground, the current of the total loop is unchanged, when the two resistors are connected in parallel with different resistance values, the divided voltage is different, and the connection state of the high-voltage interlocking loop is judged according to the condition of the voltage division of the resistors on the loop.

2. Technical scheme

In order to solve the problems, the utility model adopts the following technical scheme:

the utility model provides a new energy automobile high-voltage loop interlock detection circuitry, includes:

the high-voltage component is provided with two high-voltage component loops, and equivalent circuits of a switch S1 and a switch S2 are respectively arranged in the two high-voltage component loops; and

the BMS battery management system comprises a constant current source chip, wherein the output end of the constant current source chip is sequentially connected with a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7 in series, the output end of the resistor R1 is connected with the input end of a switch S1, the output end of a switch S1 is connected with the input end of the resistor R4, the output end of the resistor R4 is connected with the input end of the switch S2, and the output end of a switch S2 is connected with the input end of the resistor R7. The utility model adopts a hardware closed loop design, can effectively detect short power supply, short ground and open circuit faults on the high-voltage interlocking loop and has the function of judging the recovery of self output, a constant current source chip TPS92612 is used for outputting constant current of 10mA, 7 resistors at the rear stage are connected in series to the ground, the current of the total loop is unchanged, when the two resistors are connected in parallel with different resistance values, the divided voltage is different, and the connection state of the high-voltage interlocking loop is judged according to the condition of the voltage division of the resistors on the loop.

As a preferable scheme of the present invention, the model of the constant current source chip is TPS 92612.

As a preferable aspect of the present invention, the constant current source chip outputs a constant current of 10 mA.

As a preferable scheme of the present invention, a micro control module MCU is disposed in the BMS battery management system and is configured to collect voltage values divided by the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6, and the resistor R7.

3. Advantageous effects

Compared with the prior art, the utility model has the advantages that:

the utility model adopts a hardware closed loop design, can effectively detect short power supply, short ground and open circuit faults on the high-voltage interlocking loop and has the function of judging the recovery of self output, a constant current source chip TPS92612 is used for outputting constant current of 10mA, 7 resistors at the rear stage are connected in series to the ground, the current of the total loop is unchanged, when the two resistors are connected in parallel with different resistance values, the divided voltage is different, and the connection state of the high-voltage interlocking loop is judged according to the condition of the voltage division of the resistors on the loop.

Drawings

Fig. 1 is a circuit schematic diagram of a new energy automobile high-voltage loop interlock detection circuit of the utility model.

Detailed Description

The technical solution 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. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by those skilled in the art without any inventive work are within the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top/bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "sleeved/connected," "connected," and the like are to be construed broadly, e.g., "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example (b):

referring to fig. 1, a new energy vehicle high-voltage loop interlock detection circuit includes:

the high-voltage part is provided with two high-voltage part loops, and equivalent circuits of a switch S1 and a switch S2 are respectively arranged in the two high-voltage part loops;

the BMS battery management system comprises a constant current source chip, wherein the output end of the constant current source chip is sequentially connected with a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7 in series, the output end of a resistor R1 is connected with the input end of a switch S1, the output end of the switch S1 is connected with the input end of a resistor R1, the output end of the resistor R1 is connected with the input end of a switch S1, and the output end of the switch S1 is connected with the input end of the resistor R1 V2, V3, V4, V5, V6 and V7, it should be noted that: the high-voltage parts can be selected by self based on actual needs, the internal structure of the high-voltage parts belongs to the common knowledge of the technical personnel in the field, so the details are not described, how to acquire the voltage values of the resistor R1, the resistor R2, the resistor R3, the resistor R4, the resistor R5, the resistor R6 and the resistor R7 by the micro-control module MCU belongs to the common knowledge of the technical personnel in the field, therefore, the micro-control module MCU is not shown, and the connection relationship between the micro-control module MCU and each resistor is not explained;

the working principle or working process of the utility model is as follows:

s1, when the external high-voltage loop is open-circuit relative to the BMS battery management system, the MCU can acquire 7 voltage values of V1, V2, V3, V4, V5, V6 and V7 through the voltage dividing resistor;

s2, two switches S1 for external input, and a switch S2, wherein when the switch S1 is switched to normal, the resistor R2 and the resistor R3 are short-circuited, and V2= V3= V4; considering the resistance on the line of the resistor S1, the V2, V3 and V4 are not completely equal but within the allowable error range;

when the switch S2 is normally connected, the resistor R5 and the resistor R6 are short-circuited, and V5= V6= V7, and considering that the line of the switch S2 has impedance, V5, V6 and V7 are not completely equal but within an allowable error range;

s3, short power failure judgment:

when V7 equals the battery voltage, it can be judged that V7 short-circuits the power supply;

when V7 is less than V5 and V5 is equal to the battery voltage, V5 shorts the power supply;

when V7 is less than V5, V5 is less than V4, and V4 is equal to the battery voltage, V4 is shorted to the power supply;

when V7 is less than V5, V5 is less than V4, V4 is less than V2, and V2 is equal to the battery voltage, V4 shorts the power supply;

even if two points are simultaneously in the case of failure, the judgment can be carried out through the current and the resistance in the circuit;

under the condition of a short power supply, the short power supply can be protected by calculating the power of the resistor so as to prevent the device from being damaged;

s4, short-distance fault judgment:

when V2 is equal to 0V, it can be judged that V2 is short-circuited to the battery ground;

when V2>0V, V4 is equal to 0V, it can be judged that V4 is short-circuited to the battery ground;

when V2> V4>0V, and V5 is equal to 0V, it may be judged that V5 is short-circuited to the secondary battery ground;

when V2> V4> V5>0V and V7 is equal to 0V, it can be judged that V7 is short-circuited to the secondary battery;

in the short-ground condition, short-ground protection can be achieved by calculating the power of the resistor so as to prevent damage to the device.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the equivalent replacement or change according to the technical solution and the modified concept of the present invention should be covered by the scope of the present invention.

Claims

1. The utility model provides a new energy automobile high-voltage loop interlock detection circuit which characterized in that includes:

the BMS battery management system comprises a constant current source chip, wherein the output end of the constant current source chip is sequentially connected with a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7 in series, the output end of the resistor R1 is connected with the input end of a switch S1, the output end of a switch S1 is connected with the input end of the resistor R4, the output end of the resistor R4 is connected with the input end of the switch S2, and the output end of a switch S2 is connected with the input end of the resistor R7.

2. The new energy automobile high-voltage loop interlocking detection circuit as claimed in claim 1, wherein the model of the constant current source chip is TPS 92612.

3. The new energy automobile high-voltage loop interlock detection circuit according to claim 2, wherein the constant current source chip outputs a constant current of 10 mA.

4. The new energy automobile high-voltage loop interlock detection circuit as claimed in claim 3, wherein a Micro Control Unit (MCU) is provided in the BMS battery management system and is used for acquiring the divided voltage values of a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R6 and a resistor R7.