CN211741505U - Relay state detection circuit and device - Google Patents
Relay state detection circuit and device Download PDFInfo
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- CN211741505U CN211741505U CN201921738320.1U CN201921738320U CN211741505U CN 211741505 U CN211741505 U CN 211741505U CN 201921738320 U CN201921738320 U CN 201921738320U CN 211741505 U CN211741505 U CN 211741505U
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Abstract
The utility model discloses a relay state detection circuitry and device, relay state detection circuitry includes power, relay, battery voltage sampling circuit, load voltage sampling circuit and relay bonding detection circuitry. The method comprises the steps that whether the relay is adhered or not is judged by sampling voltages at two ends of a storage battery and voltages between two ends of each load and comparing the voltages through hardware sampling, and a detection circuit for detecting the adhesion of the relay outputs a low level to an I/O port of a control chip, so that the fault position is accurately judged; and the utility model discloses a hardware carries out voltage sampling and comparison, has fault detection speed sooner. The utility model discloses a practical simple reliable of circuit, failure diagnosis is fast, can the accurate fault position of judging, is favorable to in time handling the trouble, has reduced maintenance personal fault detection time, has alleviateed its working strength, the personal safety of personnel in the better guarantee electric automobile car.
Description
Technical Field
The utility model relates to the field of automotive technology, concretely relates to relay state detection circuitry and device.
Background
The power of the electric automobile is exclusively provided by the high-voltage direct-current storage battery, and the whole automobile control system realizes the connection and disconnection of high-voltage electricity of loads (a main drive motor, an air conditioner, a DC/DC, an oil pump motor, an air pump motor, electric heating and electric defrosting) in the electric automobile by controlling the coil voltage of the high-voltage direct-current relay.
The relay is used as a key part of a high-voltage system of the electric automobile, and in the long-time use process, the relay is frequently required to be cut off under load, so that the relay is adhered, the voltage of 600V is not really disconnected with the load, and the safety of automobile parts and personnel in the automobile is threatened. Therefore, the contact of the relay must be subjected to adhesion detection, the working state of the relay is judged, and once a fault is detected, the system can immediately take measures.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to overcome the weak point among the prior art and provide a relay state detection circuitry and device, can be timely, effectual diagnose relay trouble to accurate judgement fault location.
The purpose of the utility model is realized through the technical scheme of following two aspects:
in a first aspect, the utility model provides a relay state detection circuit, relay state detection circuit includes
Power supply: the power supply is used for supplying voltage to the load to enable the load to work;
a relay: the device comprises a contact and a coil, wherein the coil is connected with a low-voltage control power supply, one end of the contact is connected with the power supply, and the other end of the contact is connected with a load and is used for realizing the control of the low-voltage control power supply on a high-voltage power supply;
battery voltage sampling circuit: two input ends of the battery voltage sampling circuit are respectively connected with the anode and the cathode of the power supply and are used for acquiring the voltage of the power supply in real time;
load voltage sampling circuit: the two input ends of the load voltage sampling circuit are respectively connected with the anode and the cathode of the load and used for acquiring the voltage of the load in real time;
relay bonding detection circuitry: two input ends of the relay bonding detection circuit are respectively connected with the output end of the battery sampling circuit and the output end of the load voltage sampling circuit, and the output end of the relay bonding detection circuit is connected with an I/O port of the controller.
Further, the battery voltage sampling circuit and the load voltage sampling circuit realize voltage sampling through the same circuit structure.
Further, the battery voltage sampling circuit comprises a first resistor, a second resistor, a third resistor, a fourth resistor and a first operational amplifier;
the negative pole of power is connected to the one end of first resistance, the other end of first resistance is connected the one end and the common port of third resistance are connected the inverting input of first operational amplifier, the other end of third resistance is connected the output of first operational amplifier, the one end of second resistance is connected the positive pole of power, the other end of second resistance is connected the one end and the common port of fourth resistance are connected the noninverting input of first operational amplifier, the other end ground connection of fourth resistance.
Further, the relay adhesion detection circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fourth operational amplifier, a fifth comparator, a fifteenth resistor and a VDC power supply, wherein the fifth comparator is provided with a reference voltage VREF;
one end of the eleventh resistor is connected with the output end of the load voltage sampling circuit, the other end of the eleventh resistor is connected with one end of the thirteenth resistor and the common end of the eleventh resistor is connected with the inverting input end of the fourth operational amplifier, the other end of the thirteenth resistor is connected with the output end of the fourth operational amplifier and the common end of the thirteenth resistor is connected with the non-inverting input end of the fifth comparator, one end of the twelfth resistor is connected with the output end of the battery voltage sampling circuit, the other end of the twelfth resistor is connected with one end of the fourteenth resistor and the common end of the twelfth resistor is connected with the non-inverting input end of the fourth operational amplifier, the other end of the fourteenth resistor is grounded, the inverting input end of the fifth comparator is input with a reference voltage VREF, the output end of the fifth comparator is connected with one end of the fifteenth resistor and the common end of the fifth comparator is connected with, the other end of the fifteenth resistor is connected with a VDC power supply.
Further, the reference voltage VREF is generated by a reference voltage generating circuit, which includes a VCC power supply, a ninth resistor, a tenth resistor, a first capacitor, and a third operational amplifier;
the one end of ninth resistance is connected the VCC power, the other end of ninth resistance is connected the one end and the common port of tenth resistance are connected the one end of first electric capacity and third operational amplifier's inverting input, the other end of tenth resistance is connected the other end and the common port ground connection of first electric capacity, third operational amplifier's in-phase input is connected the output and the common port of third operational amplifier are connected the inverting input of fifth comparator.
In a second aspect, the present invention also provides a relay status detection device, which includes the first aspect.
The utility model has the advantages that: the utility model provides a relay state detection circuitry and device, the utility model discloses a circuit is practical simple, and failure diagnosis is fast, can the accurate fault location of judging, is favorable to in time handling the trouble, has reduced maintenance personal fault detection time, has alleviateed its working strength, better guarantee electric automobile car in personnel's personal safety.
Drawings
The invention is further described with the aid of the accompanying drawings, in which, however, the embodiments do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be derived from the following drawings without inventive effort.
Fig. 1 is the utility model discloses an electric automobile high voltage system relay terminal adhesion detection schematic diagram of an embodiment.
Fig. 2 is a circuit configuration diagram of a power supply voltage sampling circuit of the relay state detection circuit according to an embodiment of the present invention.
Fig. 3 is a circuit configuration diagram of a main motor voltage sampling circuit of the relay state detection circuit according to an embodiment of the present invention.
Fig. 4 is a circuit configuration diagram of a reference voltage generating circuit of the relay state detection circuit according to an embodiment of the present invention.
Fig. 5 is a circuit configuration diagram of a relay terminal adhesion detection circuit of the relay state detection circuit according to an embodiment of the present invention.
Fig. 6 is a logic block diagram of relay terminal adhesion detection of the relay state detection circuit according to an embodiment of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood, the technical solution of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
As shown in fig. 1, the relay state detection circuit of the embodiment is used in a high voltage system of an electric vehicle, and comprises
Power supply: the power supply is a storage battery in the implementation;
a relay: the device comprises a contact and a coil, wherein the coil is connected with a low-voltage control power supply, one end of the contact is connected with the power supply, and the other end of the contact is connected with a load and is used for realizing the control of the low-voltage control power supply on a high-voltage power supply;
battery voltage sampling circuit: two input ends of the battery voltage sampling circuit are respectively connected with the anode and the cathode of the power supply and are used for acquiring the voltage of the power supply in real time;
load voltage sampling circuit: the two input ends of the load voltage sampling circuit are respectively connected with the anode and the cathode of the load and used for acquiring the voltage of the load in real time;
relay bonding detection circuitry: two input ends of the relay bonding detection circuit are respectively connected with the output end of the battery sampling circuit and the output end of the load voltage sampling circuit, and the output end of the relay bonding detection circuit is connected with an I/O port of the controller.
The loads of the embodiment are a main motor, an air conditioner, a 24V-DC/DC power supply, an oil pump motor, an air pump motor, electric heating and electric defrosting, the on-off of each load is controlled by a contact of a relay, each load is provided with a fuse for protection, each load is provided with a voltage sampling circuit, and since the circuit structure of the voltage sampling circuit of each load is the same and the circuit structure of the voltage sampling circuit of the storage battery is the same as that of the load sampling circuit (as shown in fig. 2 and 3), in the embodiment, only the voltage sampling circuit of the storage battery is explained in detail.
As shown in fig. 2, the voltage sampling circuit of the secondary battery includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first operational amplifier U1;
the negative pole of battery is connected to the one end of first resistance R1, the other end of first resistance R1 is connected the one end and the common port of third resistance R3 are connected the inverting input of first operational amplifier U1, the other end of third resistance R3 is connected the output of first operational amplifier U1, the positive pole of battery is connected to the one end of second resistance R2, the other end of second resistance R2 is connected the one end and the common port of fourth resistance R4 are connected the non inverting input of first operational amplifier U1, the other end ground connection of fourth resistance R4.
Wherein, R1= R2= R3= R4, and the load and the voltage sampling circuit of the storage battery constitute a subtracter, wherein, as can be seen from the virtual disconnection of the operational amplifier U1, the subtracter is formed by the fourth circuitThe resistor R4 and the current through the second resistor R2 are equal; similarly, the currents passing through the first resistor R1 and the third resistor R3 are equal, the voltage at the point a is Va, the voltage at the point H is Vh, and the voltage at the non-inverting terminal of the operational amplifier U1 is V+The inverting terminal voltage of the operational amplifier U1 is V-The output voltage of the operational amplifier U1 is V1, so
（Va - V+）/R2 =V+/R4 （1）
（Vh - V-）/R1 = （V-- V1）/R3 （2）
From the expressions (1) and (2), V1 = Va-Vh can be obtained, and Va and Vh are voltages of the storage battery, so that the voltages at two ends of the storage battery are obtained through the voltage sampling circuit.
As shown in fig. 2 and 3, the voltage across the battery in this embodiment is V1, and the voltage across the main motor is V2.
As shown in fig. 5, the relay adhesion detection circuit of the present embodiment includes an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fourth operational amplifier U4, a comparator U5, a fifteenth resistor R15, and a VDC power supply, wherein the comparator U5 is provided with a reference voltage VREF;
one end of the eleventh resistor R11 is connected to the output end of the load voltage sampling circuit, the other end of the eleventh resistor R11 is connected to one end of the thirteenth resistor R13, and the common end of the eleventh resistor R11 is connected to the inverting input end of the fourth operational amplifier U4, the other end of the thirteenth resistor R13 is connected to the output end of the fourth operational amplifier U4, and the common end of the thirteenth resistor R5392 is connected to the non-inverting input end of the comparator U5, one end of the twelfth resistor R12 is connected to the output end of the battery voltage sampling circuit, the other end of the twelfth resistor R12 is connected to one end of the fourteenth resistor R14, and the common end of the twelfth resistor R12 is connected to the non-inverting input end of the fourth operational amplifier U4, the other end of the fourteenth resistor R14 is grounded, the inverting input end of the comparator U5 is input with the reference voltage VREF, the output end of the comparator U5 is connected to one end of the fifteenth resistor R15, the other end of the fifteenth resistor R15 is connected with a VDC power supply.
Wherein, R11= R12= R13= R14, and the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13, the fourteenth resistor R14 and the fourth operational amplifier U4 in the relay bonding detection circuit constitute a subtractor, and the operation principle thereof is the same as that of the voltage sampling circuit, and the VDE power source is a direct current voltage source of + 3.3V.
Outputting the value of V1-V2 to the non-inverting input end of a comparator U5 through a fourth operational amplifier U4, comparing the value of V1-V2 with the reference voltage VREF of the inverting input end of a comparator U5, judging the voltage difference between the storage battery and the main motor according to the comparison result, and if the voltage difference V1-V2 is greater than the reference voltage VREF, outputting a high level to an I/O port of a control chip by a comparator U5 to indicate that the contact of the relay is disconnected; if the differential pressure V1-V2 is smaller than the reference voltage VREF, the comparator U5 outputs a low level to an I/O port of the control chip, the relay terminal is still in a pull-in state, and the relay contact is in adhesion fault; the control chip can give an alarm to the fault to remind people in the vehicle to pay attention.
As shown in fig. 4, the reference voltage VREF of the present implementation is generated by a reference voltage generation circuit including a VCC power supply, a ninth resistor R9, a tenth resistor R10, a first capacitor C1, and a third operational amplifier U3;
one end of a ninth resistor R9 is connected with the VCC power supply, the other end of the ninth resistor R9 is connected with one end of a tenth resistor R10 and the common end is connected with one end of a first capacitor C1 and the inverting input end of a third operational amplifier U3, the other end of the tenth resistor R10 is connected with the other end of the first capacitor C1 and the common end is grounded, the non-inverting input end of the third operational amplifier U3 is connected with the output end of the third operational amplifier U3 and the common end is connected with the inverting input end of a comparator U5.
The power source VCC is a direct-current voltage source of +5V, the ninth resistor R9 and the tenth resistor R10 form a voltage division circuit, and the capacitor C1 is used for filtering.
The voltage input to the inverting input terminal of the third operational amplifier U3 is R10/(R9 + R10) × VCC, the third operational amplifier U3 constitutes a voltage follower, and generates a stable reference voltage VREF for the comparator U5, and different reference voltages VREF can be set as required by selecting the ninth resistor R9 and the tenth resistor R10 with different resistance values.
As shown in fig. 6, the working principle of the relay state detection circuit of the present embodiment is as follows: acquiring the voltage of a storage battery and the voltage of a load, judging whether the difference value of the voltage of the storage battery and the voltage of the load is greater than a reference voltage value, and if the voltage difference value is greater than the reference voltage, outputting a high level to an I/O port of a control chip by a comparator U5 to indicate that a contact of a relay is disconnected; if the voltage difference is smaller than the reference voltage, the comparator U5 outputs a low level to an I/O port of the control chip, which indicates that the relay terminal is still in a pull-in state and the relay contact is in an adhesion fault; the control chip can give an alarm to the fault to remind people in the vehicle to pay attention.
The embodiment also provides a relay state detection device, the relay state detection device includes this embodiment relay state detection circuit, relay state detection device not only is used for electric automobile high voltage system, can also be used for various high voltage system that use the relay and be used for detecting whether the relay bonds.
The utility model provides a relay state detection circuitry and device, through the voltage at sampling battery both ends to and the voltage between each load both ends, utilize the hardware sampling to carry out voltage comparison, judge whether the adhesion takes place for the relay, the detection circuitry that takes place the relay adhesion can export the low level and give control chip's IO mouth, thereby the accurate fault location that judges, moreover the utility model discloses a hardware carries out voltage sampling and comparison, reads the fault point that just can diagnose of high low level through control chip's IO mouth, and this is compared and passes through ADC sampling voltage in control chip, carries out voltage comparison on the software, has fault detection speed sooner.
The utility model discloses a practical simple reliable of circuit, failure diagnosis is fast, can the accurate fault position of judging, is favorable to in time handling the trouble, has reduced maintenance personal fault detection time, has alleviateed its working strength, the personal safety of personnel in the better guarantee electric automobile car.
It should be finally noted that the above embodiments are only intended to illustrate the technical solutions of the present invention, and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present invention can be modified or replaced with equivalents without departing from the spirit and scope of the technical solutions of the present invention.
Claims (6)
1. A relay state detection circuit is characterized by comprising
Power supply: the power supply is used for supplying voltage to the load to enable the load to work;
a relay: the device comprises a contact and a coil, wherein the coil is connected with a low-voltage control power supply, one end of the contact is connected with the power supply, and the other end of the contact is connected with a load and is used for realizing the control of the low-voltage control power supply on a high-voltage power supply;
battery voltage sampling circuit: two input ends of the battery voltage sampling circuit are respectively connected with the anode and the cathode of the power supply and are used for acquiring the voltage of the power supply in real time;
load voltage sampling circuit: the two input ends of the load voltage sampling circuit are respectively connected with the anode and the cathode of the load and used for acquiring the voltage of the load in real time;
relay bonding detection circuitry: two input ends of the relay bonding detection circuit are respectively connected with the output end of the battery sampling circuit and the output end of the load voltage sampling circuit, and the output end of the relay bonding detection circuit is connected with an I/O port of the controller.
2. The relay state detection circuit according to claim 1, wherein the battery voltage sampling circuit and the load voltage sampling circuit implement voltage sampling by the same circuit configuration.
3. The relay state detection circuit according to claim 1, wherein the battery voltage sampling circuit includes a first resistor, a second resistor, a third resistor, a fourth resistor, and a first operational amplifier;
the negative pole of power is connected to the one end of first resistance, the other end of first resistance is connected the one end and the common port of third resistance are connected the inverting input of first operational amplifier, the other end of third resistance is connected the output of first operational amplifier, the one end of second resistance is connected the positive pole of power, the other end of second resistance is connected the one end and the common port of fourth resistance are connected the noninverting input of first operational amplifier, the other end ground connection of fourth resistance.
4. The relay state detection circuit according to claim 1, wherein the relay adhesion detection circuit comprises an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fourth operational amplifier, a fifth comparator, a fifteenth resistor and a VDC power supply, wherein the fifth comparator is provided with a reference voltage VREF;
one end of the eleventh resistor is connected with the output end of the load voltage sampling circuit, the other end of the eleventh resistor is connected with one end of the thirteenth resistor and the common end of the eleventh resistor is connected with the inverting input end of the fourth operational amplifier, the other end of the thirteenth resistor is connected with the output end of the fourth operational amplifier and the common end of the thirteenth resistor is connected with the non-inverting input end of the fifth comparator, one end of the twelfth resistor is connected with the output end of the battery voltage sampling circuit, the other end of the twelfth resistor is connected with one end of the fourteenth resistor and the common end of the twelfth resistor is connected with the non-inverting input end of the fourth operational amplifier, the other end of the fourteenth resistor is grounded, the inverting input end of the fifth comparator is input with a reference voltage VREF, the output end of the fifth comparator is connected with one end of the fifteenth resistor and the common end of the fifth comparator is connected with, the other end of the fifteenth resistor is connected with a VDC power supply.
5. The relay state detection circuit according to claim 4, wherein the reference voltage VREF is generated by a reference voltage generation circuit including a VCC power supply, a ninth resistor, a tenth resistor, a first capacitor, and a third operational amplifier;
the one end of ninth resistance is connected the VCC power, the other end of ninth resistance is connected the one end and the common port of tenth resistance are connected the one end of first electric capacity and third operational amplifier's inverting input, the other end of tenth resistance is connected the other end and the common port ground connection of first electric capacity, third operational amplifier's in-phase input is connected the output and the common port of third operational amplifier are connected the inverting input of fifth comparator.
6. A relay state detection device characterized by comprising the relay state detection circuit according to any one of claims 1 to 5.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921738320.1U CN211741505U (en) | 2019-10-17 | 2019-10-17 | Relay state detection circuit and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921738320.1U CN211741505U (en) | 2019-10-17 | 2019-10-17 | Relay state detection circuit and device |
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| CN211741505U true CN211741505U (en) | 2020-10-23 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716134A (en) * | 2019-10-17 | 2020-01-21 | 珠海格力电器股份有限公司 | Relay state detection circuit, device and method |
| CN113777483A (en) * | 2021-09-26 | 2021-12-10 | 珠海格力电器股份有限公司 | Relay detection circuit, detection system, power distribution unit and vehicle |
| CN115963393A (en) * | 2022-12-28 | 2023-04-14 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
-
2019
- 2019-10-17 CN CN201921738320.1U patent/CN211741505U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110716134A (en) * | 2019-10-17 | 2020-01-21 | 珠海格力电器股份有限公司 | Relay state detection circuit, device and method |
| CN113777483A (en) * | 2021-09-26 | 2021-12-10 | 珠海格力电器股份有限公司 | Relay detection circuit, detection system, power distribution unit and vehicle |
| CN115963393A (en) * | 2022-12-28 | 2023-04-14 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
| CN115963393B (en) * | 2022-12-28 | 2024-01-05 | 江苏纳通能源技术有限公司 | Contact adhesion misjudgment and contact adhesion detection circuit and method |
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