CN217085198U - Adhesion detection circuit for main and negative relays of electric automobile - Google Patents
Adhesion detection circuit for main and negative relays of electric automobile Download PDFInfo
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- CN217085198U CN217085198U CN202220504253.2U CN202220504253U CN217085198U CN 217085198 U CN217085198 U CN 217085198U CN 202220504253 U CN202220504253 U CN 202220504253U CN 217085198 U CN217085198 U CN 217085198U
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- 238000001514 detection method Methods 0.000 title claims abstract description 25
- 238000002955 isolation Methods 0.000 claims abstract description 18
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000003745 diagnosis Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005465 channeling Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
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Abstract
The utility model discloses an electric automobile main negative relay adhesion detection circuit, which comprises an anti-reverse circuit unit, a filter circuit unit, a switch control unit, a resistance voltage division unit, a digital isolation unit and a micro control unit; one end of the anti-reverse circuit is connected with a high-voltage ground through the main negative relay, the other end of the anti-reverse circuit is connected with one end of the filter circuit unit, the other end of the filter circuit unit is connected with one end of the switch control unit, the other end of the switch control unit is connected in the resistance voltage division unit, the resistance voltage division unit is connected with the input of the digital isolation unit, and the output of the digital isolation unit is connected with the micro control unit. The utility model transmits the signal of the high-voltage side to the micro control unit of the low-voltage side for detection through the digital isolation unit, thereby saving extra analog signal collector chips, and having simple structure and low cost; and meanwhile, the micro control unit detects the adhesion condition of a main negative relay of the electric automobile according to the received signal, so that the safety operation of the electric automobile is guaranteed.
Description
Technical Field
The utility model relates to an electric automobile technical field specifically is an electric automobile owner negative relay adhesion detection circuitry.
Background
The battery system is the power core of the electric automobile, and how to ensure the safety of the battery system is an increasingly important research and development direction. The relay is controlling the break-make of whole battery system high pressure return circuit, if the adhesion appears in the relay, can lead to whole high pressure return circuit uncontrollable, extremely dangerous in the use. The traditional detection mode generally detects through a voltage-dividing resistor mode, an additional analog signal collector is needed on the negative side for collection, the structure is complex, and the cost is high. Meanwhile, the resistor is connected in series into a high-voltage loop of the whole battery system, so that the problem of voltage channeling possibly caused by the resistor is solved, and the safety performance of the system is influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve lies in: the detection circuit is simple in circuit structure, low in cost and capable of detecting adhesion of the main negative relay of the electric automobile.
In order to solve the technical problem, the utility model provides a following technical scheme:
an adhesion detection circuit for a main and negative relay of an electric automobile comprises an anti-reverse circuit unit, a filter circuit unit, a switch control unit, a resistance voltage division unit, a digital isolation unit and a micro control unit;
one end of the anti-reverse circuit unit is connected with a high-voltage ground through a main negative relay, the other end of the anti-reverse circuit unit is connected with one end of the filter circuit unit, the other end of the filter circuit unit is connected with one end of the switch control unit, the other end of the switch control unit is connected in the resistance voltage division unit, the resistance voltage division unit is connected with the input of the digital isolation unit, and the output of the digital isolation unit is connected with the micro control unit.
The advantages are that: the utility model transmits the signal of the high-voltage side to the micro control unit of the low-voltage side for detection through the digital isolation unit, thereby saving extra analog signal collector chips, and having simple structure and low cost; and meanwhile, the micro control unit detects the adhesion condition of the main and negative relays of the electric automobile according to the received signals.
Preferably, the anti-reverse circuit unit includes a diode D1 and a diode D2;
the anode of the diode D1 is connected with the filter circuit unit, and the cathode of the diode D2 is connected with the anode of the diode D3578; the cathode of the diode D2 is connected with a main negative relay.
Preferably, the diode D1 and the diode D2 are both GS1010FLAU in model.
Preferably, the filter circuit unit includes a resistor R4 and a capacitor C2;
one end of the resistor R4 is connected with the anode of the diode D1, and the other end is connected with the switch control unit;
one end of the capacitor C2 is connected between the resistor R4 and the switch control unit, and the other end is connected with high-voltage ground.
Preferably, the switch control unit includes a transistor Q1;
the base electrode of the triode Q1 is connected with the resistor R4, and the collector electrode and the emitter electrode are connected in the resistor voltage division unit.
Preferably, the transistor Q1 is model PDTA114 EU.
Preferably, the resistance voltage-dividing unit includes a resistance R2 and a resistance R3;
one end of the resistor R2 is connected with a high-voltage ground, and the other end of the resistor R3 is connected with one end of the resistor R2; the other end of the resistor R3 is connected with the collector of a transistor Q1, and the emitter of the transistor Q1 is connected with the voltage VCC.
Preferably, the digital isolation unit comprises a digital isolator U1, and the model number of the digital isolator U1 is NSi8120N 0;
the pin 1 of the digital isolator U1 is connected with a power supply VCC, the pin 2 is connected between a resistor R2 and a resistor R3, the pin 4 is connected with a high-voltage ground, the pin 5 is connected with a low-voltage ground, the pin 7 is connected with a micro control unit, and the pin 8 is connected with a PWR voltage.
Preferably, the PWR voltage is a DC voltage of 5V, and the voltage VCC is a DC voltage of 5V.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses simple structure, it is with low costs, detect the little the control unit of low pressure side with the signal transmission of high-pressure side through digital isolation unit, practiced thrift extra analog signal collector chip, optimized whole battery system high pressure framework, little the control unit provides the guarantee according to the signal detection electric automobile owner negative relay adhesion condition of receiving, for electric automobile's safe handling.
Drawings
Fig. 1 is a schematic circuit diagram according to an embodiment of the present invention.
Detailed Description
In order to facilitate the understanding of the technical solutions of the present invention by those skilled in the art, the technical solutions of the present invention will now be further described with reference to the drawings attached to the specification.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Referring to fig. 1, the embodiment discloses an adhesion detection circuit for a main negative relay of an electric vehicle, which comprises an anti-reverse circuit unit 1, a filter circuit unit 2, a switch control unit 3, a resistance voltage division unit 4, a digital isolation unit 5 and a micro control unit 6;
one end of the anti-reverse circuit unit is connected with a high voltage ground through a main negative relay 7, the other end of the anti-reverse circuit unit is connected with one end of the filter circuit unit 2, the other end of the filter circuit unit 2 is connected with one end of the switch control unit 3, the other end of the switch control unit 3 is connected in the resistance voltage division unit 4, the resistance voltage division unit 4 is connected with the input of the digital isolation unit 5, and the output of the digital isolation unit 5 is connected with the micro control unit 6.
Specifically, the anti-reverse circuit unit 1 includes a diode D1 and a diode D2; the anode of the diode D1 is connected with the filter circuit unit 2, and the cathode is connected with the anode of the diode D2; the cathode of the diode D2 is connected with the main negative relay 7. The diodes D1 and D2 in the anti-reverse circuit unit 1 of this embodiment can effectively isolate the main negative relay 7 from this detection circuit, and when the disconnection moment of the high-voltage main negative relay 7, prevent the damage that high-voltage back electromotive force brought to the detection circuit, improved this detection circuit's stability.
In some embodiments, diode D1 and diode D2 are both GS1010FLAU models.
The filter circuit unit 2 comprises a resistor R4 and a capacitor C2; one end of the resistor R4 is connected with the anode of the diode D1, and the other end is connected with the switch control unit 3; one end of the capacitor C2 is connected between the resistor R4 and the switch control unit 3, and the other end is connected to a high-voltage ground. The filtering unit of the embodiment can effectively filter external interference and prevent misjudgment.
The switch control unit 3 includes a transistor Q1; the base of the transistor Q1 is connected to the resistor R4.
The resistance voltage-dividing unit 4 includes a resistance R2 and a resistance R3; one end of the resistor R2 is connected with high voltage ground, and the other end is connected with one end of the resistor R3; the other end of the resistor R3 is connected with the collector of the transistor Q1, and the emitter of the transistor Q1 is connected with the voltage VCC.
In some embodiments, transistor Q1 is model PDTA114 EU.
The triode Q1 of the embodiment can control the on-off of the whole resistance voltage division unit 4, and the base electrode of the triode Q1 is connected with the main and negative relays 7, so that the adhesion state of the main and negative relays 7 can be diagnosed. The resistor R2 and the resistor R3 connected in series in the resistor voltage dividing unit 4 can control the voltage of the input end of the micro control unit 6 in a reasonable voltage range, and the IO port of the micro control unit 6 is prevented from being damaged.
The digital isolation unit 5 comprises a digital isolator U1, wherein the model of the digital isolator U1 is NSi8120N 0; pin 1 of the digital isolator U1 is connected to the power VCC, pin 2 is connected between the resistor R2 and the resistor R3, pin 4 is connected to the high voltage ground, pin 5 is connected to the low voltage ground, pin 7 is connected to the micro control unit 6, and pin 8 is connected to the PWR voltage. Pin 3 and pin 6 of digital isolator U1 are not connected to any components. And the digital isolator U1 is used for transmitting the signal of the high-voltage side to the low-voltage side for diagnosis, so that the resource of the high-voltage side is saved, and the cost is reduced.
In some embodiments, the PWR voltage is a 5V DC voltage and the voltage VCC is a 5V DC voltage.
To sum up, the main negative relay 7 of this embodiment is connected with the base of the triode Q1 through preventing the reverse circuit unit 1 and the filter circuit unit 2 from being connected, so the on-off of the triode Q1 can reflect the state of the main negative relay 7, and the reverse circuit unit 1 is prevented from being damaged by the detection circuit and the filter circuit unit 2 filters the external interference. When the transistor Q1 is turned on, the components of the voltage divider unit 4 are turned on, the input of the digital isolator U1 is turned on, and the resistor R2 and the resistor R3 in the voltage divider unit 4 can control the input of the digital isolator U1 in a proper range. And finally, the digital isolator U1 transmits the signal of the high-voltage side to the micro control unit 6 of the low-voltage side for diagnosis, so that the adhesion condition of the main and negative relays 7 is detected.
The embodiment is low in cost, safe and reliable, and the digital isolator U1 is used for transmitting the signal of the high-voltage side to the signal of the low-voltage side for detection, so that an additional analog signal collector chip is saved, the high-voltage framework of the whole battery system is optimized, and the micro control unit detects the adhesion condition of the main negative relay of the electric automobile according to the received signal, thereby providing guarantee for the safe use of the electric automobile.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
The above embodiments only show the embodiments of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and for those skilled in the art, a plurality of modifications and improvements can be made without departing from the concept of the present invention, and these modifications and improvements all belong to the protection scope of the present invention.
Claims (9)
1. The utility model provides an electric automobile owner negative relay adhesion detection circuitry which characterized in that: the circuit comprises an anti-reverse circuit unit (1), a filter circuit unit (2), a switch control unit (3), a resistance voltage division unit (4), a digital isolation unit (5) and a micro control unit (6);
the anti-reverse circuit is characterized in that one end of the anti-reverse circuit unit (1) is connected with a high-voltage ground through a main negative relay (7), the other end of the anti-reverse circuit unit is connected with one end of the filter circuit unit (2), the other end of the filter circuit unit (2) is connected with one end of the switch control unit (3), the other end of the switch control unit (3) is connected in the resistor voltage division unit (4), the resistor voltage division unit (4) is connected with the input of the digital isolation unit (5), and the output of the digital isolation unit (5) is connected with the micro control unit (6).
2. The adhesion detection circuit for the main and negative relays of the electric vehicle as claimed in claim 1, wherein: the anti-reverse circuit unit (1) includes a diode D1 and a diode D2;
the anode of the diode D1 is connected with the filter circuit unit (2), and the cathode is connected with the anode of the diode D2; the cathode of the diode D2 is connected with a main negative relay (7).
3. The adhesion detection circuit for the main and negative relays of the electric vehicle as claimed in claim 2, wherein: the model of the diode D1 and the model of the diode D2 are GS1010 FLAU.
4. The adhesion detection circuit for the main and negative relays of the electric vehicle as claimed in claim 2, wherein: the filter circuit unit (2) comprises a resistor R4 and a capacitor C2;
one end of the resistor R4 is connected with the anode of the diode D1, and the other end is connected with the switch control unit (3);
one end of the capacitor C2 is connected between the resistor R4 and the switch control unit (3), and the other end is connected with high-voltage ground.
5. The adhesion detection circuit for the main and negative relays of the electric vehicle as claimed in claim 4, wherein: the switch control unit (3) comprises a triode Q1;
the base electrode of the triode Q1 is connected with the resistor R4, and the collector electrode and the emitter electrode are connected in the resistor voltage division unit (4).
6. The adhesion detection circuit for the main and negative relays of the electric vehicle as claimed in claim 5, wherein: the transistor Q1 is model PDTA114 EU.
7. The adhesion detection circuit for the main and negative relays of the electric vehicle as claimed in claim 5, wherein: the resistance voltage division unit (4) comprises a resistor R2 and a resistor R3;
one end of the resistor R2 is connected with a high-voltage ground, and the other end of the resistor R3 is connected with one end of the resistor R2; the other end of the resistor R3 is connected with the collector of a transistor Q1, and the emitter of the transistor Q1 is connected with the voltage VCC.
8. The adhesion detection circuit for the main and negative relays of the electric vehicle as claimed in claim 7, wherein: the digital isolation unit (5) comprises a digital isolator U1, and the model number of the digital isolator U1 is NSi8120N 0;
the pin 1 of the digital isolator U1 is connected with a power supply VCC, the pin 2 is connected between a resistor R2 and a resistor R3, the pin 4 is connected with a high-voltage ground, the pin 5 is connected with a low-voltage ground, the pin 7 is connected with a micro control unit (6), and the pin 8 is connected with a PWR voltage.
9. The main and negative relay adhesion detection circuit of an electric vehicle according to claim 8, characterized in that: the PWR voltage is a DC voltage of 5V, and the voltage VCC is a DC voltage of 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220504253.2U CN217085198U (en) | 2022-03-07 | 2022-03-07 | Adhesion detection circuit for main and negative relays of electric automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220504253.2U CN217085198U (en) | 2022-03-07 | 2022-03-07 | Adhesion detection circuit for main and negative relays of electric automobile |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217085198U true CN217085198U (en) | 2022-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220504253.2U Active CN217085198U (en) | 2022-03-07 | 2022-03-07 | Adhesion detection circuit for main and negative relays of electric automobile |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217085198U (en) |
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2022
- 2022-03-07 CN CN202220504253.2U patent/CN217085198U/en active Active
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