CN210427772U - High-voltage interlocking detection circuit - Google Patents
High-voltage interlocking detection circuit Download PDFInfo
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- CN210427772U CN210427772U CN201920664087.0U CN201920664087U CN210427772U CN 210427772 U CN210427772 U CN 210427772U CN 201920664087 U CN201920664087 U CN 201920664087U CN 210427772 U CN210427772 U CN 210427772U
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Abstract
A high-voltage interlocking detection circuit is characterized by comprising a constant-current power supply, a detection loop, a mechanical loop and a diagnosis loop, wherein the constant-current power supply is connected with the diagnosis loop in series, the mechanical loop and the detection loop are connected with the diagnosis loop in parallel after being connected with each other in series, the constant-current power supply is also connected to the ground, the constant-current power supply is mainly used as a driving power supply and is matched with the detection loop to play a role together, whether the mechanical loop, namely a high-voltage interlocking state, is normally connected or not can be monitored in real time, and the change of a micro resistor can be detected due to the fact that the constant-current source is not high in sensitivity to parasitic parameters, so that the accuracy and reliability of a connection state detection result are greatly improved.
Description
Technical Field
The utility model discloses establish and relate to new energy automobile high pressure loop detection early warning field, the more specifically high-pressure interlocking error detection circuit that says so.
Background
With the continuous development of the new energy automobile industry, the new energy automobile industry is concerned about the advantages of energy conservation and environmental protection, the endurance mileage of the electric automobile is continuously improved, the technology is continuously mature, and the new energy automobile industry is accepted by wide consumers.
The electric automobile is driven by power supplied by a power battery, the working voltage of the power battery is higher, usually 400V-600V, and all sub-components in the power battery system are connected through a high-voltage connector, so that the high-voltage connector becomes one of the devices with the largest potential safety hazard in the power battery system, and once the high-voltage connector fails, the safety of the whole power battery system is affected. International standards specify that a high voltage interlock is required to be provided in a power battery system for testing a high voltage connector, the existing high voltage interlock including: the pulse width signal generator comprises a pulse width signal generator and a comparator, wherein one low-voltage terminal of the pulse width signal generator is connected with the input end of the high-voltage connector, one input end of the comparison circuit is connected with the low-voltage terminal, the other input end of the comparison circuit is connected with the output end of the high-voltage connector, and the pulse width signal generator is used for judging whether the pulse width signal input by the high-voltage connector is consistent with the output signal or not, if so, the high-voltage connector is normal, and if not, the high-voltage connector is broken.
In order to solve the problem, chinese patent CN 108387809a discloses a high voltage interlock detection circuit and a high voltage interlock detection method, wherein a constant current adjustment component is connected with a high voltage connector to form a detection loop, the constant current adjustment component is used for controlling the current of the detection loop to be constant, an electric signal detection component is used for detecting the voltage of the detection loop, the impedance of the high voltage connector can be determined according to the voltage amplitude of the detection loop, and then judge whether the high-voltage connector is in the normal working state, compared with the prior art that the pulse width modulation signal is detected and compared, the accuracy of measurement is higher, but the detection circuit has no self-diagnosis function, namely, the circuit cannot be judged whether to be normal or not, and if the circuit fails and is not repaired in time, the high-voltage loop is abnormally connected, so that safety accidents are caused.
Disclosure of Invention
In order to solve the technical problem, the invention provides a high-voltage interlocking detection circuit which comprises a constant-current power supply, a detection loop, a mechanical loop and a diagnosis loop, wherein the constant-current power supply is connected with the diagnosis loop in series, the mechanical loop and the detection loop are connected with the diagnosis loop in parallel after being connected with each other in series, and the constant-current power supply is also connected to the ground;
further, the constant current power supply is a constant current source of 20ma +/-5 ma and is used for providing constant current for the circuit;
further, the diagnostic loop comprises a resistor R1, a resistor R2 and a digital-to-analog converter (hereinafter referred to as ADC), wherein the resistor R1 and the resistor R2 are connected in series, and the ADC is connected across the resistor R2; the diagnostic loop is used for implementing whether the functional characteristics of the diagnostic circuit are normal or not;
further, the detection loop comprises a resistor R3, a resistor R4 and the ADC, wherein the resistor R3 and the resistor R4 are connected in series, and the ADC is connected across the resistor R4; the detection loop is used for detecting a high-voltage interlocking signal and completing functional diagnosis of the high-voltage interlocking circuit by matching with the diagnosis loop;
further, the mechanical loop comprises a high-voltage connector and a high-voltage connector connecting resistor R, wherein the high-voltage connector comprises a high-voltage interlocking signal output end Hvil _ op and a high-voltage interlocking signal input end Hvil _ in; when the high-voltage loop is connected normally, the constant current flows out from the Hvil _ op, passes through the external loop and then flows into the Hvil _ in.
Advantageous effects
The invention adopts the constant current power supply as a driving source, and is matched with the connection of the detection loop for use, so that whether the mechanical loop, namely the high-voltage interlocking state is normally connected or not can be monitored in real time, and because the sensitivity of the constant current source to parasitic parameters is not high, the change of a tiny resistor can be detected, the accuracy and the reliability of a detection result of the connection state are greatly improved, and on the other hand, the diagnosis loop is designed in a circuit, and the connection state of the whole circuit and whether an output circuit of the constant current power supply is normal or not can also be detected.
Drawings
Fig. 1 is a schematic diagram of the high-voltage interlock detection circuit of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention, but are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", and the like are used for convenience in describing the invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
In the description of the present invention, it should be further noted that, unless explicitly stated or limited in the art, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed connections, detachable connections, or integral connections, either direct connections or indirect connections through intervening media. The specific meaning of the above terms in the present invention can be understood as the case may be, by those of ordinary skill in the art.
For better understanding of the present invention, the high voltage interlock detection circuit according to the embodiment of the present invention will be described in detail with reference to fig. 1.
The high-voltage interlocking detection circuit shown in fig. 1 comprises a constant current power supply 1, a detection loop 2, a mechanical loop 3 and a diagnosis loop 4, wherein the constant current power supply 1 is connected with the diagnosis loop 4 in series, the mechanical loop 3 is connected with the detection loop 2 in series and then connected with the diagnosis loop 4 in parallel, and the constant current power supply 1 is also connected to the ground;
further, the constant current power supply 1 is a constant current source of 20ma +/-5 ma and is used for providing a constant current for the circuit;
further, the diagnostic loop 4 includes a resistor R1, a resistor R2, and a digital-to-analog converter (hereinafter abbreviated as ADC) 5, where the resistor R1 and the resistor R2 are connected in series, and the ADC5 is connected across the resistor R2; the diagnostic loop is used for implementing whether the functional characteristics of the diagnostic circuit are normal or not;
further, the detection loop 2 comprises a resistor R3, a resistor R4 and the ADC5, wherein the resistor R3 and the resistor R4 are connected in series, and the ADC5 is connected across the resistor R4; the detection loop 2 is used for detecting a high-voltage interlocking signal and is matched with the diagnosis loop 4 to complete the functional diagnosis of the high-voltage interlocking circuit;
further, the mechanical loop 3 includes a high-voltage connector 31 and a high-voltage connector connecting resistor R, and the high-voltage connector 31 includes a high-voltage interlock signal output end Hvil _ op and a high-voltage interlock signal input end Hvil _ in; when the high-voltage loop is connected normally, the constant current flows out from the Hvil _ op, passes through the external loop and then flows into the Hvil _ in;
the detection scheme and the process are as follows:
further, the ADC5 respectively collects the voltage Udiag value of the diagnosis loop 4 and the voltage Uin of the detection loop 2, the voltage Udiag value and the voltage Uin are transmitted to the MCU, the MCU judges the connection state of the high-voltage interlocking circuit by judging the Udiag and the Uin values,
further, Udiag = g
,Uin=
When the high voltage connector 31 is disconnected, R is infinite, Udiag has a maximum value, Uin has a minimum value, i.e. udigmax = I × R2, UinMIN = 0; that is, when UdiagMAX = I × R2 and UinMIN =0, it is determined that the high-voltage connector 31 is in the open state,
when the high voltage connector 31 is closed, R =0, Udiag has a minimum value and Uin has a maximum value, i.e. udigmin = Udiag =
,UinMAX=
That is, when UdiagMIN = Udiag =
,UinMAX=
When this occurs, the high-voltage connector 31 is closed;
further, in the embodiment, it is preset that R is not more than a when the high-voltage connector is normally connected;
further, when R = a, Udiag = Uth1=
,Uin=Uth2=
,
The logic for judging the connection state of the interlocking circuit is shown in Table 1
As can be seen from table 1, the logic relationship of whether the diagnosis circuit is normal is as follows:
when Udiag is larger than or equal to UdiagMAX and Uin is a null value, judging that the interlocking circuit is abnormal in connection;
when Udiag is less than or equal to UdiagMIN and Uin is a null value, judging that the interlocking circuit is abnormal in connection;
when Udiag is a null value and Uind is larger than UinMAX, judging that the interlocking circuit is abnormal in connection;
when Udiag is less than or equal to Uth1 and Uin is less than or equal to Uth2, the interlock circuit is judged to be normally connected.
Further, the threshold values of Uth1 and Uth2 are set according to the driving current value set by the constant current power supply 1 and the allowable connection resistance value of the high voltage connector 31.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To those skilled in the art to which the invention pertains, a number of simple deductions or substitutions can be made without departing from the scope of the invention, which should be considered as belonging to the scope of the present invention as defined by the appended claims.
Claims (5)
1. The high-voltage interlocking detection circuit is characterized by comprising a constant-current power supply, a detection loop, a mechanical loop and a diagnosis loop, wherein the constant-current power supply is connected with the diagnosis loop in series, the mechanical loop and the detection loop are connected with the diagnosis loop in parallel after being connected with each other in series, and the constant-current power supply is also connected to the ground.
2. The high voltage interlock detection circuit according to claim 1, wherein said constant current source is a 20ma ± 5ma constant current source for providing a constant current to the circuit.
3. The high voltage interlock detection circuit of claim 1, wherein said diagnostic loop comprises a resistor R1, a resistor R2, and a digital-to-analog converter (ADC), said resistor R1 and resistor R2 being connected in series, said ADC being connected across said resistor R2; the diagnostic loop is used to diagnose whether the functional characteristics of the circuit are normal.
4. The high voltage interlock detection circuit as claimed in claim 3, wherein said detection loop comprises a resistor R3, a resistor R4 and said ADC, said resistor R3 and said resistor R4 are connected in series, said ADC is connected across said resistor R4; the detection loop is used for detecting the high-voltage interlocking signal and is matched with the diagnosis loop to complete the functional diagnosis of the high-voltage interlocking circuit.
5. The high-voltage interlock detection circuit according to claim 1, wherein the mechanical loop comprises a high-voltage connector and a high-voltage connector connection resistor R, the high-voltage connector comprises a high-voltage interlock signal output end Hvil _ op and a high-voltage interlock signal input end Hvil _ in; when the high-voltage loop is connected normally, the constant current flows out from the Hvil _ op, passes through the external loop and then flows into the Hvil _ in.
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| CN201920664087.0U CN210427772U (en) | 2019-05-10 | 2019-05-10 | High-voltage interlocking detection circuit |
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| CN201920664087.0U CN210427772U (en) | 2019-05-10 | 2019-05-10 | High-voltage interlocking detection circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112461897A (en) * | 2020-11-11 | 2021-03-09 | 欣旺达电动汽车电池有限公司 | Protective adhesive curing state determination method, standard impedance value determination method and standard impedance value determination device |
| CN113777521A (en) * | 2020-05-22 | 2021-12-10 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
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2019
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113777521A (en) * | 2020-05-22 | 2021-12-10 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
| CN113777521B (en) * | 2020-05-22 | 2023-05-09 | 宁德时代新能源科技股份有限公司 | High-voltage interlocking circuit and detection method thereof |
| CN112461897A (en) * | 2020-11-11 | 2021-03-09 | 欣旺达电动汽车电池有限公司 | Protective adhesive curing state determination method, standard impedance value determination method and standard impedance value determination device |
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