CN111123089A - Relay detection circuit and device - Google Patents
Relay detection circuit and device Download PDFInfo
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- CN111123089A CN111123089A CN202010016037.9A CN202010016037A CN111123089A CN 111123089 A CN111123089 A CN 111123089A CN 202010016037 A CN202010016037 A CN 202010016037A CN 111123089 A CN111123089 A CN 111123089A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3275—Fault detection or status indication
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3271—Testing of circuit interrupters, switches or circuit-breakers of high voltage or medium voltage devices
- G01R31/3272—Apparatus, systems or circuits therefor
Abstract
The embodiment of the application provides a relay detection circuit and a relay detection device, and relates to the technical field of relay detection. The relay detection circuit includes: the first end of the first current limiting unit is connected with the positive electrode of the battery module; the non-inverting input end of the first operational amplifier is connected with the second end of the first current limiting unit, the inverting input end of the first operational amplifier is connected with the first end of the processing module, and the output end of the first operational amplifier is connected with the first end of the processing module; the first end of the second current limiting unit is connected with the second end of the first current limiting unit, and the second end of the second current limiting unit is connected with the negative electrode of the battery module; the first end of the first relay is connected with the negative electrode of the battery module, the second end of the first relay is connected with the positive electrode of the battery module through the load module, and the processing module judges whether the first relay is adhered or not through the voltage of the output end of the first operational amplifier. Through the arrangement, the efficiency of relay detection can be improved.
Description
Technical Field
The application relates to the technical field of relay detection, in particular to a relay detection circuit and a relay detection device.
Background
With the continuous promotion of the electrification process with the trend of energy conservation and intelligence, the future development trend is that a cleaner and more efficient new energy electric vehicle replaces the traditional fuel vehicle. With the continuous development and progress of electric vehicles, the operational safety of the electric vehicles is gradually emphasized, and the safety state of the electric vehicles is particularly important when the battery pack is used as a power output core of the electric vehicles.
The working process of the battery pack generally includes that the battery management system receives an instruction of the vehicle control unit to control the attraction or disconnection of a relay contact in a high-voltage circuit of the battery, and then the power-on and power-off of a high-voltage system of the electric vehicle are controlled. In the output process of the battery pack, the battery pack is always in a high-voltage and high-current state, so that the working state of a relay of a battery high-voltage system is controlled, and particularly whether the high-voltage relays at the positive end and the negative end of the battery are normally switched or not is very important for the safety of an electric automobile. The relay is damaged and adhered, and if the battery management system is not aware of the damage and adhesion, the problem of failure is likely to occur, so that the whole vehicle and personal safety are damaged. Therefore, the adhesion detection of the relay becomes one of the necessary functions of the modern battery management system to eliminate unsafe factors existing in the charging and discharging process of the battery.
However, the inventor researches and finds that in the prior art, whether the relay is adhered or not needs to be judged according to the bus voltage of the single chip microcomputer outside the battery pack, so that the problem of low relay detection efficiency exists.
Disclosure of Invention
In view of the above, the present application is directed to a relay detection circuit and apparatus to solve the problems in the prior art.
In order to achieve the above purpose, the embodiment of the present application adopts the following technical solutions:
a relay detection circuit applied to a relay detection device including a battery module, a relay module, a load module, and a processing module, the relay module including a first relay, the relay detection circuit comprising:
a first current limiting unit, a first end of which is connected with the positive pole of the battery module;
the non-inverting input end of the first operational amplifier is connected with the second end of the first current limiting unit, the inverting input end of the first operational amplifier is connected with the first end of the processing module, and the output end of the first operational amplifier is connected with the first end of the processing module;
a second current limiting unit, a first end of which is connected with a second end of the first current limiting unit, and a second end of which is connected with a negative electrode of the battery module;
the first end of the first relay is connected with the negative electrode of the battery module, the second end of the first relay is connected with the positive electrode of the battery module through the load module, and the processing module judges whether the first relay is adhered or not through the voltage at the output end of the first operational amplifier.
In a preferred option of the embodiment of the present application, the relay detection circuit further includes:
the control end of the first switch unit is connected with the second end of the processing module, the input end of the first switch unit is connected with the non-inverting input end of the first operational amplifier, and the output end of the first switch unit is connected with the second end of the first relay;
and a first end of the third current limiting unit is connected with the output end of the first switch unit, and a second end of the third current limiting unit is connected with the second end of the first relay, so that the first switch unit is connected with the load module through the third current limiting unit.
In a preferred option of the embodiment of the present application, the relay detection circuit further includes:
and the first end of the first voltage stabilizing unit is connected with the second end of the first current limiting unit, and the second end of the first voltage stabilizing unit is connected with the negative electrode of the battery module.
In a preferred option of the embodiment of the present application, the first voltage stabilizing unit includes a first capacitor, a first end of the first capacitor is connected to the second end of the first current limiting unit, and a second end of the first capacitor is connected to the negative electrode of the battery module.
In a preferred option of the embodiment of the present application, the first current limiting unit includes a first resistor, a second resistor, and a third resistor, a first end of the first resistor is connected to the positive electrode of the battery module, a first end of the second resistor is connected to a second end of the first resistor, a first end of the third resistor is connected to a second end of the second resistor, and a second end of the third resistor is connected to the non-inverting input terminal of the first operational amplifier;
the second current limiting unit comprises a fourth resistor, wherein the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the negative electrode of the battery module;
the third current limiting unit comprises a fifth resistor, wherein the first end of the fifth resistor is connected with the output end of the first switch unit, and the second end of the fifth resistor is connected with the second end of the first relay.
In a preferred option of the embodiment of the present application, the first switch unit includes a first triode, a base of the first triode is connected to the second end of the processing module, a collector of the first triode is connected to the non-inverting input terminal of the first operational amplifier, and an emitter of the first triode is connected to the second end of the first relay.
In a preferred option of the embodiment of the present application, the relay module further includes a second relay, and the relay detection circuit further includes:
a fourth current limiting unit, a first end of which is connected with the positive electrode of the battery module;
a non-inverting input end of the second operational amplifier is connected with the second end of the fourth current limiting unit, an inverting input end of the second operational amplifier is connected with the first end of the processing module, and an output end of the second operational amplifier is connected with the first end of the processing module;
a fifth current limiting unit, a first end of which is connected with a second end of the fourth current limiting unit, and a second end of which is connected with a negative electrode of the battery module;
the first end of the second relay is connected with the positive electrode of the battery module, the second end of the second relay is connected with the negative electrode of the battery module through the load module, and the processing module judges whether the second relay is adhered through the voltage at the output end of the second operational amplifier.
In a preferred option of the embodiment of the present application, the relay detection circuit further includes:
and the first end of the second voltage stabilizing unit is connected with the second end of the fourth current limiting unit, and the second end of the second voltage stabilizing unit is connected with the negative electrode of the battery module.
In a preferred option of the embodiment of the present application, the second voltage stabilizing unit includes a second capacitor, a first end of the second capacitor is connected to the second end of the fourth current limiting unit, and a second end of the second capacitor is connected to a negative electrode of the battery module.
The embodiment of the present application further provides a relay detection device, including:
a battery module;
a relay module;
a load module;
a processing module;
the relay detection circuit is respectively connected with the battery module, the relay module, the load module and the processing module, and the processing module judges whether the relay module is adhered or not through the voltage at the output end of the relay detection circuit.
The embodiment of the application provides a relay detection circuitry and device, through setting up first current-limiting unit, first operational amplifier and second current-limiting unit, with pass through whether adhesion of first relay is judged to the voltage of first operational amplifier output to whether the adhesion of relay is judged according to the bus voltage of the outside singlechip of battery package among the prior art, the problem of the inefficiency of the relay detection that leads to.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a block diagram of a relay detection device according to an embodiment of the present application.
Fig. 2 is a block diagram of a structure of a relay detection circuit provided in an embodiment of the present application.
Fig. 3 is a schematic circuit diagram of a relay detection device according to an embodiment of the present application.
Fig. 4 is another schematic circuit diagram of a relay detection device according to an embodiment of the present application.
Fig. 5 is another schematic circuit diagram of a relay detection device according to an embodiment of the present application.
Fig. 6 is another schematic circuit diagram of a relay detection device according to an embodiment of the present application.
Icon: 10-relay detection means; 100-relay detection circuit; 110-a first current limiting unit; 120-a second current limiting unit; 130-a first switching unit; 140-a third current limiting unit; 150-a first voltage stabilization unit; 160-a fourth current limiting unit; 170-a fifth current limiting unit; 180-a second voltage stabilization unit; 200-a battery module; 300-a relay module; 400-a load module; 500-a processing module; 510-a single chip microcomputer; 520-an analog-to-digital converter; 530-optical coupler; q1 — first operational amplifier; q2 — second operational amplifier; s1-a first relay; s2-a second relay; s3-a pre-charging relay; c1 — first capacitance; c2 — second capacitance; r1 — first resistance; r2 — second resistance; r3 — third resistance; r4-fourth resistor; r5-fifth resistor; r6-sixth resistance; r7 — seventh resistor; r8 — eighth resistance; r9 — ninth resistor; r10 — tenth resistance; r11-precharge resistor; d1-first transistor.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is further noted that, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As shown in fig. 1, an embodiment of the present application provides a relay detection apparatus 10, which may include a relay detection circuit 100, a battery module 200, a relay module 300, a load module 400, and a processing module 500.
In detail, the relay detection circuit 100 is respectively connected to the battery module 200, the relay module 300, the load module 400 and the processing module 500, and the processing module 500 determines whether the relay module 300 is adhered or not according to the voltage at the output terminal of the relay detection circuit 100.
For the battery module 200, it should be noted that the battery module 200 may be a battery high voltage system (PACK), and is formed by connecting a plurality of battery cells in series and parallel. For example, if 100 cells are combined in series, the battery module 200 has a high voltage of 370V to supply to the electric vehicle, which is 3.7V.
For the load module 400, it should be noted that the specific structure of the load module 400 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the load module 400 may include an electric motor of an electric vehicle.
For the processing module 500, it should be noted that the specific structure of the processing module 500 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the processing module 500 may include a Single Chip Microcomputer 510 (MCU), an analog-to-Digital converter 520 (ADC), and an optical coupler 530.
The analog-to-digital converter 520 is connected to the output end of the relay detection circuit 100, and can isolate the circuit, and transmit the output signal of the relay detection circuit 100 to the single chip microcomputer 510 for processing, and the single chip microcomputer 510 can send a control signal to the relay detection circuit 100 through the optical coupler 530 connected thereto.
For the vehicle control unit, it should be noted that the VCU is a core electronic control unit for implementing a vehicle control decision. The VCU judges the driving intention of a driver by acquiring signals of an accelerator pedal, a gear, a brake pedal and the like, monitors vehicle state (vehicle speed, temperature and the like) information, judges and processes the information, sends a running state control instruction of the vehicle to a power System and a Battery Management System (BMS) and controls the working mode of a vehicle-mounted power System.
For the battery management system, it should be noted that the battery pack is a core energy source of the new energy automobile, provides driving electric energy for the whole automobile, and mainly forms a battery pack main body by enveloping a shell made of a metal material, and the modular structural design realizes integration of a battery core. Realize the management to electric core through the BMS to and with the communication and the information exchange of whole car, and the BMS can improve the utilization ratio of battery, prevent that overcharge and overdischarge from appearing in the battery, prolong the life of battery. The single chip microcomputer 510 is a core device of the battery management system.
With reference to fig. 2 and fig. 3, an embodiment of the present application further provides a relay detection circuit 100, which can be used in the relay detection apparatus 10 described above. When the relay module 300 includes the first relay S1, the relay detection circuit 100 may include a first current limiting unit 110, a first operational amplifier Q1, and a second current limiting unit 120.
In detail, a first end of the first current limiting unit 110 is connected to a positive electrode of the battery module 200. The non-inverting input terminal of the first operational amplifier Q1 is connected to the second terminal of the first current limiting unit 110, the inverting input terminal thereof is connected to the first terminal of the processing module 500, and the output terminal thereof is connected to the first terminal of the processing module 500. A first end of the second current limiting unit 120 is connected to a second end of the first current limiting unit 110, and a second end is connected to a negative electrode of the battery module 200.
The first end of the first relay S1 is connected to the negative electrode of the battery module 200, the second end is connected to the positive electrode of the battery module 200 through the load module 400, and the processing module 500 determines whether the first relay S1 is stuck according to the voltage at the output end of the first operational amplifier Q1.
Through above setting, through setting up first current-limiting unit, first operational amplifier and second current-limiting unit, with pass through whether the adhesion of first relay is judged to the voltage of first operational amplifier output to whether the adhesion of relay is judged according to the bus voltage of the outside singlechip of battery package among the prior art, the problem of the inefficiency that the relay that leads to detected is avoided.
Referring to fig. 4, the relay detection circuit may further include a first switching unit 130, a third current limiting unit 140, and a first voltage stabilizing unit 150.
In detail, the control terminal of the first switch unit 130 is connected to the second terminal of the processing module 500, the input terminal thereof is connected to the non-inverting input terminal of the first operational amplifier Q1, and the output terminal thereof is connected to the second terminal of the first relay S1. A first terminal of the third current limiting unit 140 is connected to the output terminal of the first switching unit 130, and a second terminal of the third current limiting unit 140 is connected to a second terminal of the first relay S1, so that the first switching unit 130 is connected to the load module 400 through the third current limiting unit 140. A first end of the first voltage stabilizing unit 150 is connected to a second end of the first current limiting unit 110, and a second end is connected to a negative electrode of the battery module 200.
For the first current limiting unit 110, it should be noted that the specific structure of the first current limiting unit 110 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the first current limiting unit 110 may include a first resistor R1, a second resistor R2, and a third resistor R3.
In detail, a first terminal of the first resistor R1 is connected to the positive electrode of the battery module 200, a first terminal of the second resistor R2 is connected to a second terminal of the first resistor R1, a first terminal of the third resistor R3 is connected to a second terminal of the second resistor R2, and a second terminal is connected to the non-inverting input terminal of the first operational amplifier Q1.
For the second current limiting unit 120, it should be noted that the specific structure of the second current limiting unit 120 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the second current limiting unit 120 may include a fourth resistor R4. The first end of the fourth resistor R4 is connected to the second end of the third resistor R3, and the second end is connected to the negative terminal of the battery module 200.
For the first switch unit 130, it should be noted that the specific structure of the first switch unit 130 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the first switching unit 130 may include a first transistor D1. The base of the first transistor D1 is connected to the second terminal of the processing module 500, the collector is connected to the non-inverting input terminal of the first operational amplifier Q1, and the emitter is connected to the second terminal of the first relay S1.
For the third current limiting unit 140, it should be noted that the specific structure of the third current limiting unit 140 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the third current limiting unit 140 may include a fifth resistor R5. A first terminal of the fifth resistor R5 is connected to the output terminal of the first switching unit 130, and a second terminal thereof is connected to the second terminal of the first relay S1.
For the first voltage stabilizing unit 150, it should be noted that the specific structure of the first voltage stabilizing unit 150 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the first voltage stabilizing unit 150 may include a first capacitor C1. A first end of the first capacitor C1 is connected to a second end of the first current limiting unit 110, and a second end is connected to a negative electrode of the battery module 200.
When the first relay S1 is turned off and the first transistor D1 is turned off, the voltage V1 at the output terminal of the first operational amplifier Q1 is:
when the first relay S1 is turned off and the first transistor D1 is turned on, the output voltage V1 of the relay detection circuit 100 is:
when the first relay S1 is closed and the first transistor D1 is turned on, the output voltage V1 of the relay detection circuit 100 is:
after the fourth resistor R4 and the fifth resistor R5 are connected in parallel, the fourth resistor R4 can be equivalent to a tenth resistor R10 as shown in formula (3), and V1 as shown in formula (4) can be calculated.
In the present embodiment, the total pressure U of the battery module 200 is 400V, R4 and R5 are 10K Ω, R1, R2 and R3 are 500K Ω, and V1 is 2.65V according to formulas (1) and (2); v1 ═ 1.33V can be obtained according to formula (4). Therefore, whether the first relay S1 is in the stuck state can be determined according to the voltage at the output terminal of the first operational amplifier Q1.
Referring to fig. 5 and 6, when the relay module 300 includes the second relay S2, the relay detection circuit 100 may include a fourth current limiting unit 160, a second operational amplifier Q2, and a fifth current limiting unit 170.
In detail, a first end of the fourth current limiting unit 160 is connected to a positive electrode of the battery module 200. A non-inverting input terminal of the second operational amplifier Q2 is connected to the second terminal of the fourth current limiting unit 160, an inverting input terminal thereof is connected to the first terminal of the processing module 500, and an output terminal thereof is connected to the first terminal of the processing module 500. A first end of the fifth current limiting unit 170 is connected to a second end of the fourth current limiting unit 160, and a second end is connected to a negative electrode of the battery module 200.
The first end of the second relay S2 is connected to the positive electrode of the battery module 200, the second end is connected to the negative electrode of the battery module 200 through the load module 400, and the processing module 500 determines whether the second relay S2 is stuck according to the voltage at the output end of the second operational amplifier Q2.
Further, the relay detection circuit 100 may further include a second voltage stabilization unit 180. A first end of the second voltage stabilizing unit 180 is connected to a second end of the fourth current limiting unit 160, and a second end is connected to a negative electrode of the battery module 200.
For the fourth current limiting unit 160, it should be noted that the specific structure of the fourth current limiting unit 160 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the fourth current limiting unit 160 may include a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.
In detail, a first end of the sixth resistor R6 is connected to a second end of the second relay S2, a first end of the seventh resistor R7 is connected to a second end of the sixth resistor R6, a first end of the eighth resistor R8 is connected to a second end of the seventh resistor R7, and a second end of the eighth resistor R8 is connected to a non-inverting input terminal of the second operational amplifier Q2.
For the fifth current limiting unit 170, it should be noted that a specific structure of the fifth current limiting unit 170 is not limited, and may be set according to an actual application requirement.
For example, in an alternative example, the fifth current limiting unit 170 may include a ninth resistor R9. The ninth resistor R9 has a first terminal connected to the non-inverting input terminal of the second operational amplifier Q2 and a second terminal connected to the negative terminal of the battery module 200.
For the second voltage stabilizing unit 180, it should be noted that the specific structure of the second voltage stabilizing unit 180 is not limited, and may be set according to the actual application requirement.
For example, in an alternative example, the second voltage stabilizing unit 180 may include a second capacitor C2. A first end of the second capacitor C2 is connected to a second end of the fourth current limiting unit, and a second end is connected to a negative electrode of the battery module.
Further, the relay module 300 may further include a pre-charge relay S3 and a pre-charge resistor R11. It should be noted that the precharge relay S3 functions like a soft start. When the battery module 200 outputs high voltage to the motor, because the motor end has a high-voltage large capacitor, when the battery module 200 just starts to charge the capacitor at the motor end, the charging is similar to a short-circuit state at the moment of starting due to the characteristics of the capacitor, and at this time, if the first relay S1 and the second relay S2 are directly closed, the relays are easily damaged. Can be through closing pre-charge relay S3, because the existence of pre-charge resistance R11, battery module 200 can slowly charge to the electric capacity of motor end, avoids the high pressure of battery directly to the electric capacity charge, causes the relay to damage. After the first relay S1 is closed, the pre-charging relay S3 is closed, and after the pre-charging is completed, the second relay S2 is closed, and the pre-charging relay S3 is opened, so that the high-voltage output process is completed.
When the second relay S2 and the pre-charge relay S3 are both open, the voltage V2 at the output terminal of the second operational amplifier Q2 is 0V, and it can be determined that neither the second relay S2 nor the pre-charge relay S3 is closed.
When any one of the second relay S2 and the precharge relay S3 is closed, the voltage V2 at the output terminal of the second operational amplifier Q2 is as shown in equation (5):
in the embodiment of the present application, the total pressure U of the battery module 200 is 400V, R9 is 10K Ω, R6, R7, and R8 are 500K Ω, respectively, V2 may be obtained as 2.65V according to equation (5), and it may be determined that at least one of the second relay S2 and the precharge relay S3 is closed. Therefore, it can be determined whether the second relay S2 and the precharge relay S3 are stuck according to the voltage at the output terminal of the second operational amplifier Q2.
Further, when the relay module 300 includes the first relay S1, the second relay S2, and the precharge relay S3, the voltage V2 at the output terminal of the second operational amplifier Q2 may be read, and it may be determined whether V2 is 0. If V2 is not equal to 0, at least one of the second relay S2 and the pre-charging relay S3 is in a stuck state. If V2 is equal to 0, the second relay S2 and the precharge relay S3 are normal.
Further, the voltage V1 at the output of the first operational amplifier Q1 may be read, and it may be determined whether V1 is equal to the PACK cell cumulative sum. And if the V1 is not equal to the PACK cell accumulated sum, judging whether the V1 is equal to half of the PACK cell accumulated sum. If the V1 is not equal to half of the PACK cell accumulated sum, the system is abnormal. If the V1 is equal to half of the cumulative sum of PACK cells, the first relay S1 is in a stuck state, and the first triode D1 is in an abnormal conduction state.
Further, when the V1 equals to the cumulative sum of the PACK cells, the first triode D1 is controlled to be turned on, and it is determined again whether the V1 equals to the cumulative sum of the PACK cells. And if the V1 is equal to the PACK battery cell accumulated sum, the first relay S1 is normal. And if the V1 is not equal to the PACK cell accumulated sum, judging whether the V1 is equal to half of the PACK cell accumulated sum. And if the V1 is equal to half of the cumulative sum of the PACK cells, the first relay S1 is in a bonding state. If the V1 is not equal to half of the PACK cell accumulated sum, the system is abnormal.
To sum up, the relay detection circuitry and the device that this application embodiment provided are through setting up first current-limiting unit, first operational amplifier and second current-limiting unit, in order to pass through whether the adhesion of first relay is judged to the voltage of first operational amplifier output to whether the adhesion of relay is judged according to the bus voltage of the outside singlechip of battery package among the prior art, the problem of the inefficiency of the relay detection that leads to.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The utility model provides a relay detection circuitry which characterized in that, is applied to the relay detection device who includes battery module, relay module, load module and processing module, the relay module includes first relay, relay detection circuitry includes:
a first current limiting unit, a first end of which is connected with the positive pole of the battery module;
the non-inverting input end of the first operational amplifier is connected with the second end of the first current limiting unit, the inverting input end of the first operational amplifier is connected with the first end of the processing module, and the output end of the first operational amplifier is connected with the first end of the processing module;
a second current limiting unit, a first end of which is connected with a second end of the first current limiting unit, and a second end of which is connected with a negative electrode of the battery module;
the first end of the first relay is connected with the negative electrode of the battery module, the second end of the first relay is connected with the positive electrode of the battery module through the load module, and the processing module judges whether the first relay is adhered or not through the voltage at the output end of the first operational amplifier.
2. The relay detection circuit of claim 1, further comprising:
the control end of the first switch unit is connected with the second end of the processing module, the input end of the first switch unit is connected with the non-inverting input end of the first operational amplifier, and the output end of the first switch unit is connected with the second end of the first relay;
and a first end of the third current limiting unit is connected with the output end of the first switch unit, and a second end of the third current limiting unit is connected with the second end of the first relay, so that the first switch unit is connected with the load module through the third current limiting unit.
3. The relay detection circuit of claim 2, further comprising:
and the first end of the first voltage stabilizing unit is connected with the second end of the first current limiting unit, and the second end of the first voltage stabilizing unit is connected with the negative electrode of the battery module.
4. The relay detection circuit according to claim 3, wherein the first voltage stabilization unit includes a first capacitor having a first terminal connected to the second terminal of the first current limiting unit and a second terminal connected to the negative terminal of the battery module.
5. The relay detection circuit according to claim 2, wherein the first current limiting unit comprises a first resistor, a second resistor and a third resistor, a first end of the first resistor is connected with the positive pole of the battery module, a first end of the second resistor is connected with a second end of the first resistor, a first end of the third resistor is connected with a second end of the second resistor, and a second end of the third resistor is connected with a non-inverting input terminal of the first operational amplifier;
the second current limiting unit comprises a fourth resistor, wherein the first end of the fourth resistor is connected with the second end of the third resistor, and the second end of the fourth resistor is connected with the negative electrode of the battery module;
the third current limiting unit comprises a fifth resistor, wherein the first end of the fifth resistor is connected with the output end of the first switch unit, and the second end of the fifth resistor is connected with the second end of the first relay.
6. The relay detection circuit of claim 2, wherein the first switching unit comprises a first transistor having a base connected to the second terminal of the processing module, a collector connected to the non-inverting input of the first operational amplifier, and an emitter connected to the second terminal of the first relay.
7. The relay detection circuit according to any of claims 1-6, wherein the relay module further comprises a second relay, the relay detection circuit further comprising:
a fourth current limiting unit, a first end of which is connected with the positive electrode of the battery module;
a non-inverting input end of the second operational amplifier is connected with the second end of the fourth current limiting unit, an inverting input end of the second operational amplifier is connected with the first end of the processing module, and an output end of the second operational amplifier is connected with the first end of the processing module;
a fifth current limiting unit, a first end of which is connected with a second end of the fourth current limiting unit, and a second end of which is connected with a negative electrode of the battery module;
the first end of the second relay is connected with the positive electrode of the battery module, the second end of the second relay is connected with the negative electrode of the battery module through the load module, and the processing module judges whether the second relay is adhered through the voltage at the output end of the second operational amplifier.
8. The relay detection circuit of claim 7, further comprising:
and the first end of the second voltage stabilizing unit is connected with the second end of the fourth current limiting unit, and the second end of the second voltage stabilizing unit is connected with the negative electrode of the battery module.
9. The relay detection circuit according to claim 8, wherein the second voltage stabilization unit includes a second capacitor having a first terminal connected to the second terminal of the fourth current limiting unit and a second terminal connected to the negative terminal of the battery module.
10. A relay testing apparatus, comprising:
a battery module;
a relay module;
a load module;
a processing module;
the relay detection circuit of any of claims 1-9, wherein the relay detection circuit is connected to the battery module, the relay module, the load module, and the processing module determines whether the relay module is stuck based on the voltage at the output of the relay detection circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010016037.9A CN111123089A (en) | 2020-01-08 | 2020-01-08 | Relay detection circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010016037.9A CN111123089A (en) | 2020-01-08 | 2020-01-08 | Relay detection circuit and device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113167833A (en) * | 2020-10-21 | 2021-07-23 | 深圳欣锐科技股份有限公司 | Relay detection circuit and detection device based on differential sampling |
| CN113366326A (en) * | 2020-10-21 | 2021-09-07 | 深圳欣锐科技股份有限公司 | Relay adhesion detection circuit, method and system |
| CN115372817A (en) * | 2022-10-26 | 2022-11-22 | 国网江西省电力有限公司电力科学研究院 | Automatic detection device and method for building block type relay |
-
2020
- 2020-01-08 CN CN202010016037.9A patent/CN111123089A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113167833A (en) * | 2020-10-21 | 2021-07-23 | 深圳欣锐科技股份有限公司 | Relay detection circuit and detection device based on differential sampling |
| CN113366326A (en) * | 2020-10-21 | 2021-09-07 | 深圳欣锐科技股份有限公司 | Relay adhesion detection circuit, method and system |
| WO2022082524A1 (en) * | 2020-10-21 | 2022-04-28 | 深圳欣锐科技股份有限公司 | Differential sampling-based relay detection circuit and detection device |
| WO2022082503A1 (en) * | 2020-10-21 | 2022-04-28 | 深圳欣锐科技股份有限公司 | Relay adhesion detection circuit, method and system |
| CN113167833B (en) * | 2020-10-21 | 2023-10-20 | 深圳欣锐科技股份有限公司 | Relay detection circuit and detection device based on differential sampling |
| CN115372817A (en) * | 2022-10-26 | 2022-11-22 | 国网江西省电力有限公司电力科学研究院 | Automatic detection device and method for building block type relay |
| CN115372817B (en) * | 2022-10-26 | 2023-03-14 | 国网江西省电力有限公司电力科学研究院 | Automatic detection device and method for building block type relay |
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