CN219105049U

CN219105049U - Battery management system test fixture

Info

Publication number: CN219105049U
Application number: CN202222850466.3U
Authority: CN
Inventors: 田本武
Original assignee: Huizhou Eve Power Battery Co ltd; Hubei Eve Power Co Ltd
Current assignee: Huizhou Eve Power Battery Co ltd; Hubei Eve Power Co Ltd
Priority date: 2022-10-27
Filing date: 2022-10-27
Publication date: 2023-05-30
Anticipated expiration: 2032-10-27

Abstract

The utility model discloses a battery management system testing tool. The battery voltage simulation circuit comprises a plurality of first light-emitting modules and a resistor string connected between a first power supply and a second power supply, wherein the resistor string comprises a plurality of resistors, and each resistor is connected with the first light-emitting module in parallel; the driving detection circuit is at least one of a high-side driving detection circuit and a low-side driving detection circuit; the drive detection circuit comprises a drive control end and a detection output end, and also comprises a relay and a first dial switch; the coil of the relay is connected with the driving control end; the relay comprises a public contact, a normally open contact or a normally closed contact, a first end of the first dial switch is connected with a first power supply, a second end and a third end of the first dial switch are respectively connected with the public contact and the normally open contact, and a detection output end is connected with the normally open contact. Two circuits are integrated into one testing tool, so that testing of all modules of the energy storage BMS can be completed only by one testing tool, and the integration level is high.

Description

Battery management system test fixture

Technical Field

The utility model relates to the technical field of batteries, in particular to a battery management system testing tool.

Background

The battery management system (Battery Management Systern, BMS) of the electric automobile is a key part of a battery system in a three-electric system of the electric automobile, and is a key core component for monitoring the operation of the battery system and protecting the battery system. To improve the product performance and quality of BMS, a series of tests for BMS are therefore critical.

At present self-control energy storage BMS test fixture can only satisfy the simulation of voltage and temperature on the voltage acquisition board, and test function is simple, can not cover energy storage BMS's most functional test, can not carry out system level test to energy storage BMS.

Disclosure of Invention

The utility model provides a battery management system testing tool, which integrates a battery voltage analog circuit and a drive detection circuit into one testing tool, so that the testing of all modules of an energy storage BMS can be completed by only using one testing tool, and the system-level functional testing of the energy storage BMS is realized, and the integration level is high.

According to an aspect of the present utility model, there is provided a battery management system test fixture, comprising:

the battery voltage simulation circuit comprises a plurality of first light-emitting modules and a resistor string connected between a first power supply and a second power supply, wherein the resistor string comprises a plurality of resistors, and each resistor is connected with a first light-emitting module in parallel;

the driving detection circuit is at least one of a high-side driving detection circuit and a low-side driving detection circuit; the drive detection circuit comprises a drive control end and a detection output end, and also comprises a relay and a first dial switch; the coil of the relay is connected with the driving control end, and the voltage input by the driving control end is used for controlling the electrification or the de-electrification of the coil of the relay; the relay comprises a public contact, a normally open contact or a normally closed contact, a first end of the first dial switch is connected with a first power supply, a second end and a third end of the first dial switch are respectively connected with the public contact and the normally open contact, and a detection output end is connected with the normally open contact.

Further, the driving detection circuit further comprises a second light emitting module and a diode;

the diode and the second light-emitting module are connected in parallel with the coil of the relay, and the cathode of the diode is connected with the driving control end.

Further, the battery management system testing tool further comprises a third light-emitting module, and the third light-emitting module is connected between the second power supply and the normally open contact.

Further, the first light emitting module and the third light emitting module each include a light emitting diode and a resistor connected in series with the light emitting diode.

Further, the battery management system testing tool also comprises an adjustable resistor and a second dial switch;

the first end of the second dial switch is connected with the first end of the adjustable resistor, and the second end of the adjustable resistor is connected with the second end of the second dial switch;

the second end and the third end of the second dial switch are respectively used for connecting with the thermistor test pins of the corresponding connector.

Further, the battery management system testing tool also comprises a third dial switch, a first resistor and a second resistor; the first end of the first resistor is connected with a first power supply, and the second end of the first resistor is connected with the first end of the third dial switch; the first end of the second resistor is connected with the first power supply, and the second end of the second resistor is connected with the second end of the third dial switch;

the third terminal and the fourth terminal of the third dial switch are respectively used for connecting the interlocking signal test pins of the corresponding connector.

Further, the battery management system testing tool also comprises a fourth dial switch and a third resistor; the first end of the third resistor is connected with the first power supply, and the second end of the third resistor is connected with the first end of the fourth dial switch; the second end, the third end and the fourth end of the fourth dial switch are respectively used for connecting the interlocking signal test pins of the corresponding connector.

Further, the battery management system testing tool further comprises an operational amplifier, a fourth resistor, a fifth resistor and a first capacitor;

the first end of the fourth resistor is used for being connected with the first power pin of the corresponding connector, the second end of the fourth resistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is used for being connected with the second power pin of the corresponding connector; the first capacitor is connected with the fifth resistor in parallel;

the positive input end of the operational amplifier is connected with the first end of the fifth resistor, and the negative input end of the operational amplifier is connected with the output end of the operational amplifier and is used for being connected with the signal output pin of the connector.

Further, the resistance value of the fifth resistor is adjustable.

Further, the battery management system testing tool further comprises a plurality of fourth light emitting modules, wherein the first ends of the fourth light emitting modules are connected with the first power supply or the second power supply, and the second ends of the fourth light emitting modules are connected with dry contact testing pins of the corresponding connectors.

According to the battery voltage analog circuit provided by the embodiment of the utility model, the first light-emitting module and the resistor are designed in parallel, and different analog voltages can be generated according to different needs by adopting a resistor voltage division mode. And the driving detection circuit is combined with the first dial switch by simulating the feedback contact of the real relay, so that the high-side and/or low-side control of the BMS can be simulated and tested, and the BMS cannot be tested due to the lack of input and output signals. The battery voltage simulation circuit and the driving detection circuit are integrated into one testing tool, so that testing can be completed on all modules of the energy storage BMS only by one testing tool, system-level functional testing on the energy storage BMS is realized, and the integration level is high.

It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the utility model or to delineate the scope of the utility model. Other features of the present utility model will become apparent from the description that follows.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic circuit diagram of a battery voltage analog circuit according to an embodiment of the present utility model;

FIG. 2 is a schematic circuit diagram of a high-side drive detection circuit according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a low-side drive detection circuit according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a circuit including a thermistor testing tool according to an embodiment of the present utility model;

fig. 5 is a schematic circuit diagram of a dc signal detecting circuit according to an embodiment of the present utility model;

FIG. 6 is a schematic circuit diagram of an interlock signal detection circuit according to an embodiment of the present utility model;

FIG. 7 is a schematic circuit diagram of a test fixture including an operational amplifier according to an embodiment of the present utility model;

fig. 8 is a circuit schematic diagram of a dry-contact conduction detection circuit according to an embodiment of the present utility model.

Detailed Description

In order that those skilled in the art will better understand the present utility model, a technical solution in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present utility model and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the utility model described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

The utility model provides a battery management system test fixture, wherein fig. 1 is a circuit schematic diagram of a battery voltage simulation circuit provided according to an embodiment of the utility model, fig. 2 is a circuit schematic diagram of a high-side drive detection circuit provided according to an embodiment of the utility model, and fig. 3 is a circuit schematic diagram of a low-side drive detection circuit provided according to an embodiment of the utility model. Referring to fig. 1, 2 and 3, the battery management system test fixture provided by the present utility model specifically includes:

the battery voltage simulation circuit 100, the battery voltage simulation circuit 100 includes a plurality of first light emitting modules 10 and a resistor string connected between a first power source VCC and a second power source VEE, the resistor string includes a plurality of resistors, each resistor is connected in parallel with a first light emitting module 10;

a drive detection circuit which is at least one of a high-side drive detection circuit 101 and a low-side drive detection circuit 102; the drive detection circuit comprises a drive control end (1) and a detection output end (2), and also comprises a relay 11 and a first dial switch 12; the coil 13 of the relay 11 is connected with a drive control end (1), and the voltage input by the drive control end (1) is used for controlling the power-on or power-off of the coil 13 of the relay 11; the relay 11 comprises a public contact 3, a normally open contact 4 or a normally closed contact 2, a first end 1 of a first dial switch 12 is connected with a first power supply VCC, a second end 5 and a third end 6 of the first dial switch 12 are respectively connected with the public contact 3 and the normally open contact 4, and a detection output end (2) is connected with the normally open contact 4.

Specifically, the second power VEE may be grounded or connected to a negative power supply. The resistor string includes a plurality of resistors, and as illustrated in fig. 1, the resistor string includes a resistor R25, a resistor R26, a resistor R27, a resistor R30, a resistor R35, a resistor R40, a resistor R77, and the like, where the resistor may be a constant value resistor and/or an adjustable resistor, and embodiments of the present utility model are not limited thereto. The first light emitting module 10 in the battery voltage analog circuit 100 includes a light emitting diode D20 and a resistor R1 connected in series with the light emitting diode D20, and is mainly used for feeding back whether the connection between the resistors is normal in the test process, and for example, if the resistors are normally conducted, the first light emitting module 10 corresponding to each resistor emits light normally, and if one of the first light emitting modules 10 does not emit light, the corresponding resistor may be connected with a short circuit, etc., the abnormal situation of the detection circuit is not illustrated one by one in the embodiment of the utility model. When the battery voltage analog circuit 100 is abnormal, the first light emitting module 10 can quickly find out the problem and timely solve the problem, so that the testing efficiency is improved.

The high-side drive detection circuit 101 is to enable the driving device by connecting a high level before the driving device, as shown in fig. 2, and the low-side drive detection circuit 102 is to enable the driving device by connecting a low level after the driving device, as shown in fig. 3. Since the high-side driving detection circuit 101 and the low-side driving detection circuit 102 only have different driving modes of the driving control terminal (1), the embodiment of the present utility model specifically describes the operation principle of the driving detection circuit by taking the high-side driving detection circuit 101 as an example, and refer to fig. 2:

the relay 11 may be a signal relay with auxiliary contacts. The high level is input to the drive control terminal (1), the coil 13 of the drive relay 11 is conducted, and the common contact 3 and the normally open contact 4 of the relay 11 can be conducted. The first dial switch 12 is mainly used for simulating the validity and the invalidity of the high-side drive detection circuit 101. When the first end 1 and the second end 5 of the first dial switch 12 are turned on and the first end 1 and the third end 6 of the first dial switch 12 are turned off, the common contact 3 and the normally open contact 4 of the relay 11 are in a conductive state, and the detection output end (2) can detect the high level of the first power VCC connected to the first end 1 of the first dial switch 12, and at this time, the effective condition of the high-side driving detection circuit 101 is mainly simulated. When the first end 1, the second end 5 and the third end 6 of the first dial switch 12 are all disconnected, the common contact 3 and the normally open contact 4 of the relay 11 are in a conducting state, but the detection output end (2) cannot detect the high level of the first power source VCC connected to the first end 1 of the first dial switch 12, and the failure condition of the high-side driving detection circuit 101 is mainly simulated at this time.

According to the battery voltage simulation circuit 100 provided by the embodiment of the utility model, different simulation voltages can be generated according to different needs by adopting a resistor voltage division mode through parallel connection of the first light emitting module 10 and the resistor. The driving detection circuit is combined with the first dial switch 12 by simulating the feedback contact of the real relay, so that the high-side and/or low-side control of the BMS can be simulated and tested, and the BMS cannot be tested due to the lack of input and output signals. The battery voltage simulation circuit 100 and the driving detection circuit are integrated into one testing tool, so that testing can be completed on all modules of the energy storage BMS only by one testing tool, system-level functional testing on the energy storage BMS is realized, and the integration level is high.

Optionally, with continued reference to fig. 2, the drive detection circuit further includes a second light emitting module 14 and a diode D30; the diode D30 and the second light emitting module 14 are connected in parallel with the coil 13 of the relay 11, and the cathode of the diode D30 is connected with the driving control terminal (1).

By way of example, taking the high-side drive detection circuit 101 as an example, when the drive control terminal (1) inputs a high level, since the second light emitting module 14 is connected in parallel with the coil 13 of the relay 11, when the coil 13 of the relay 11 is turned on, the second light emitting module 14 is turned on and emits light, and the second light emitting module 14 can detect whether the high level input by the drive control terminal (1) is normal. The diode D30 is connected in anti-parallel to the driving detection circuit, so that the voltage at the two ends of the second light emitting module 14 can be prevented from being too high, and the voltage stabilizing effect is achieved.

Optionally, with continued reference to fig. 2, the drive detection circuit further includes a third light emitting module 15, the third light emitting module 15 being connected between the second power supply VEE and the normally open contact 4.

Specifically, the second power VEE may be grounded, and the third light emitting module 15 may assist in determining whether the driving detection circuit is effective, and illustratively, when the detection output (2) may detect the high level of the first power VCC connected to the first end 1 of the first dial switch 12, the third light emitting module 15 emits light, and at this time, the driving detection circuit is effective; when the detection output terminal (2) cannot detect the high level of the first power VCC connected to the first terminal 1 of the first dial switch 12, the third light emitting module 15 does not emit light, and the drive detection circuit is disabled.

Alternatively, referring to fig. 1 and 2, the first and third

light emitting modules

10 and 15 each include a light emitting diode D20, and a resistor connected in series with the light emitting diode D20.

Specifically, the series connection of the light emitting diode D20 and the resistor can limit the current passing through the light emitting diode D20, prevent the larger current from damaging the PN junction inside the light emitting diode D20, and protect the light emitting diode D20.

FIG. 4 is a schematic circuit diagram of a thermistor test fixture according to an embodiment of the present utility model, optionally, referring to FIG. 4, the test fixture further includes an adjustable resistor R41 and a second dial switch 16;

the first end 7 of the second dial switch 16 is connected with the first end of the adjustable resistor R41, and the second end of the adjustable resistor R41 is connected with the second end 9 of the second dial switch 16; the second end 9 and the third end 8 of the second dial switch 16 are respectively used for connecting with the thermistor test pins of the corresponding connector.

Specifically, the resistance of the external NTC thermistor at different temperatures can be simulated by adjusting the resistance of the adjustable resistor R41, where the NTC thermistor can be understood as a negative temperature coefficient thermistor, which is a sensor resistor with a resistance value decreasing with an increase in temperature, and the adjustable resistor R41 is connected to the second dial switch 16, where the second end 9 of the second dial switch 16 is connected to the ground end of the thermistor test pin of the corresponding connector. The first end 7 and the third end 8 of the second dial switch 16 are connected, and the first end 7 and the second end 9 of the second dial switch 16 are disconnected, so that current flows through the second dial switch 16, and flows to the second end 9 of the second dial switch 16 to be connected with the grounding end of the thermistor test pin of the corresponding connector through the adjustable resistor R41, and the condition that the circuit in which the NTC thermistor is positioned works normally is simulated; the first end 7, the third end 8 and the second end 9 of the second dial switch 16 are simultaneously conducted, so that current flows through the second dial switch 16 and directly flows to the second end 9 of the second dial switch 16 to be connected with the grounding end of the thermistor test pin of the corresponding connector, and the condition of short circuit of a circuit where the NTC thermistor is positioned is simulated; the first end 7 and the third end 8 of the second dial switch 16 are disconnected, so that current cannot pass through the second dial switch 16, and flows to the second end 9 of the second dial switch 16 through the adjustable resistor R41 to be connected with the grounding end of the thermistor test pin of the corresponding connector, and the condition of open circuit of the circuit where the NTC thermistor is located is simulated. By designing the circuit connection mode of the second dial switch 16 and the adjustable resistor R41, the realization method of the real temperature of the acquisition board can be simulated, and the short circuit and open circuit testing method of the circuit where the NTC thermistor is positioned can be simulated.

Fig. 5 is a schematic circuit diagram of a dc signal detecting circuit according to an embodiment of the present utility model, and optionally, referring to fig. 5, the test fixture further includes a third dial switch K1, a first resistor R81, and a second resistor R90; the first end of the first resistor R81 is connected with a first power supply VCC, and the second end of the first resistor R81 is connected with a first end A1 of the third dial switch K1; the first end of the second resistor R90 is connected with the first power supply VCC, and the second end of the second resistor R90 is connected with the second end A2 of the third dial switch K1; the third terminal A3 and the fourth terminal A4 of the third dial switch K1 are respectively used for connecting the interlocking signal test pins of the corresponding connector.

Specifically, the interlock signal test pin may be a dc signal test pin, and illustratively, as shown in fig. 5, a dc signal is input from the dc signal test pin ACT1 and the dc signal test pin ACT 2. The effectiveness and failure of the direct current signal are simulated through the on-off of the third dial switch K1. Since the left end 17 and the right end 18 of the third dial switch K1 are symmetrically disposed, the effects are the same, and the simulation principle of the validity and invalidity of the dc signal is illustrated by taking the left end 17 of the third dial switch K1 as an example:

the third end A3 of the third dial switch K1 is connected with the direct current signal test pin ACT1, when the first end A1 and the third end A3 of the third dial switch K1 are conducted, the direct current signal test pin ACT1 can detect a direct current signal sent by the first power supply VCC, and at the moment, the effective condition of the direct current signal of a product is mainly simulated; when the first end A1 and the third end A3 of the third dial switch K1 are disconnected, the dc signal test pin ACT1 does not detect the dc signal sent by the first power VCC, and at this time, the failure condition of the dc signal of the product is mainly simulated.

Fig. 6 is a schematic circuit diagram of an interlocking signal detection circuit according to an embodiment of the present utility model, and optionally, referring to fig. 6, the test fixture further includes a fourth dial switch K2 and a third resistor R114; the first end of the third resistor R114 is connected with the first power supply VCC, and the second end of the third resistor R114 is connected with the first end B1 of the fourth dial switch K2; the second end B2, the third end B3 and the fourth end B4 of the fourth dial switch K2 are respectively used for connecting the interlocking signal test pins of the corresponding connector.

Specifically, the on-off of the fourth dial switch K2 simulates the validity and invalidation of the interlocking signal. Since the left end 19 of the fourth dial switch K2 is the same as the simulation principle of the validity and invalidation of the dc signal, the specific principle will not be described in detail herein, and the simulation principle of the validity and invalidation of the interlock signal of the right end 20 of the fourth dial switch K2 will be described in detail:

the third end B3 of the fourth dial switch K2 is connected with an interlocking signal test pin HVIL+, the interlocking signal test pin HVIL+ inputs a pulse width modulation signal (Pulse width modulation, PWM), the fourth end B4 of the fourth dial switch K2 is connected with the interlocking signal test pin HVIL-, and when the third end B3 and the fourth end B4 of the fourth dial switch K2 are conducted, the interlocking signal test pin HVIL-can detect the pulse width modulation signal emitted by the interlocking signal test pin HVIL+, and at the moment, the effective condition of the interlocking signal of a product is mainly simulated; when the third terminal B3 and the fourth terminal B4 of the fourth dial switch K2 are disconnected, the interlocking signal test pin HVIL-cannot detect the pulse width modulation signal emitted by the interlocking signal test pin hvil+, and at this time, the failure condition of the interlocking signal of the product is mainly simulated.

Fig. 7 is a schematic circuit diagram of a test fixture including an operational amplifier according to an embodiment of the present utility model, optionally, referring to fig. 7, the test fixture further includes an operational amplifier U1, a fourth resistor R152, a fifth resistor R153, and a first capacitor C11; a first end of the fourth resistor R152 is used for being connected with a first power supply pin LEM-VCC of a corresponding connector, a second end of the fourth resistor R152 is connected with a first end of the fifth resistor R153, and a second end of the fifth resistor R153 is used for being connected with a second power supply pin LEM-GND of the corresponding connector; the first capacitor C11 is connected with the fifth resistor R153 in parallel; the forward input terminal In1+ of the operational amplifier U1 is connected to the first terminal of the fifth resistor R153, and the reverse input terminal IN 1-of the operational amplifier U1 is connected to the output terminal OUT1 thereof and is used for being connected to the signal output pin LEM-OUT1 of the connector.

The fifth resistor R153 may be selected to be a fixed resistor or an adjustable resistor. The second power supply pin LEM-GND is the ground terminal. The operational amplifier U1 may be a single-path operational amplifier, a two-path operational amplifier, a four-path operational amplifier, etc., which is not limited in this embodiment, and the embodiment of the present utility model uses the two-path operational amplifier as an example to illustrate the working principle of the detection circuit of fig. 7:

firstly, the left path is analyzed, the first power supply pin LEM-VCC, the fourth resistor R152, the fifth resistor R153 and the second power supply pin LEM-GND are connected IN sequence, and the voltage value of the positive input end In1+ of the operational amplifier U1 can be controlled by installing the fourth resistor R152 and the fifth resistor R153 with different resistance values. The first capacitor C11 is connected in parallel with the fifth resistor R153, and can perform a filtering function. The inverting input terminal IN 1-of the operational amplifier U1 is connected with the output terminal OUT1 thereof to form a voltage follower, so that the output impedance of the signal can be reduced. The right and left channels are connected similarly, and the effects are the same, and the specific working principle is not described here.

Optionally, with continued reference to fig. 7, the resistance value of the fifth resistor R153 is adjustable.

Specifically, the resistance value of the fifth resistor R153 is adjustable, and for example, an electronic component adjustable resistor, a ceramic disc adjustable resistor, a patch adjustable resistor, a wire winding adjustable resistor, etc. may be selected. The fifth resistor R153 with adjustable resistance value is selected, so that the voltage value of the forward input end In1+ of the operational amplifier U1 can be controlled according to the requirement under the condition that the resistor is not replaced, and the operation is simpler and more convenient.

Fig. 8 is a circuit schematic diagram of a DRY contact conduction detection circuit according to an embodiment of the present utility model, optionally, referring to fig. 8, the test fixture further includes a plurality of fourth light emitting modules 21, a first end of each fourth light emitting module 21 is connected to the first power VCC or the second power VEE, and a second end of each fourth light emitting module 21 is connected to a DRY contact test tube pin DRY7 of a corresponding connector.

Specifically, the test fixture can determine whether the dry contact of the product is turned on by whether the fourth light emitting module 21 emits light. For example, the second end of the fourth light emitting module 21 is connected to the DRY contact test pin DRY7 of the corresponding connector, when the first end of the fourth light emitting module 21 is powered on, if the fourth light emitting module 21 emits light, it indicates that the DRY contact of the product is turned on; if the fourth light module 21 does not emit light, it indicates that the dry contact of the product is not conductive.

It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present utility model may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present utility model are achieved, and the present utility model is not limited herein.

The above embodiments do not limit the scope of the present utility model. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included in the scope of the present utility model.

Claims

1. The utility model provides a battery management system test fixture which characterized in that includes:

the battery voltage simulation circuit comprises a plurality of first light-emitting modules and a resistor string connected between a first power supply and a second power supply, wherein the resistor string comprises a plurality of resistors, and each resistor is connected with one first light-emitting module in parallel;

the driving detection circuit is at least one of a high-side driving detection circuit and a low-side driving detection circuit; the driving detection circuit comprises a driving control end and a detection output end, and also comprises a relay and a first dial switch; the coil of the relay is connected with the driving control end, and the voltage input by the driving control end is used for controlling the power-on or power-off of the coil of the relay; the relay comprises a public contact, a normally open contact or a normally closed contact, a first end of the first dial switch is connected with the first power supply, a second end and a third end of the first dial switch are respectively connected with the public contact and the normally open contact, and the detection output end is connected with the normally open contact.

2. The test fixture of claim 1, wherein the drive detection circuit further comprises a second light emitting module and a diode;

the diode and the second light-emitting module are connected with the coil of the relay in parallel, and the cathode of the diode is connected with the driving control end.

3. The test fixture of claim 1, further comprising a third light module connected between the second power source and the normally open contact.

4. The test fixture of claim 3, wherein the first light module and the third light module each comprise a light emitting diode and a resistor in series with the light emitting diode.

5. The test fixture of any one of claims 1-4, further comprising an adjustable resistor and a second dial switch;

the second end and the third end of the second dial switch are respectively used for connecting with a thermistor test pin of a corresponding connector.

6. The test fixture of any one of claims 1-4, further comprising a third dial switch, a first resistor, and a second resistor; the first end of the first resistor is connected with the first power supply, and the second end of the first resistor is connected with the first end of the third dial switch; the first end of the second resistor is connected with the first power supply, and the second end of the second resistor is connected with the second end of the third dial switch;

and the third end and the fourth end of the third dial switch are respectively used for connecting the interlocking signal test pins of the corresponding connectors.

7. The test fixture of claim 6, further comprising a fourth dip switch, and a third resistor; the first end of the third resistor is connected with the first power supply, and the second end of the third resistor is connected with the first end of the fourth dial switch; the second end, the third end and the fourth end of the fourth dial switch are respectively used for connecting the interlocking signal test pins of the corresponding connector.

8. The test fixture of any one of claims 1-4, further comprising an operational amplifier, a fourth resistor, a fifth resistor, and a first capacitor;

the first end of the fourth resistor is used for being connected with a first power pin of a corresponding connector, the second end of the fourth resistor is connected with the first end of the fifth resistor, and the second end of the fifth resistor is used for being connected with a second power pin of the corresponding connector; the first capacitor is connected with the fifth resistor in parallel;

9. The test fixture of claim 8, wherein the resistance value of the fifth resistor is adjustable.

10. The test fixture of any one of claims 1-4, further comprising a plurality of fourth light modules, a first end of the fourth light modules being connected to the first power source or the second power source, a second end of the fourth light modules being connected to a dry contact test pin of a corresponding connector.