CN212586508U - Switch detection circuit and vehicle - Google Patents
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- CN212586508U CN212586508U CN202021244090.6U CN202021244090U CN212586508U CN 212586508 U CN212586508 U CN 212586508U CN 202021244090 U CN202021244090 U CN 202021244090U CN 212586508 U CN212586508 U CN 212586508U
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Abstract
The present disclosure relates to a switch detection circuit and a vehicle, the switch detection circuit provides a diagnostic voltage threshold range for diagnosis of a detection voltage by a first voltage output from a first reference voltage output terminal and a second voltage output from a second reference voltage output terminal, and determines that a low voltage switch is in a fault state in a case where the detection voltage is in the diagnostic voltage threshold range, that is, the detection voltage is greater than the first voltage, or the detection voltage is less than the second voltage; when the first voltage is greater than the detection voltage and the detection voltage is greater than the second voltage, the low-voltage switch is determined to be in a normal working state, the fault tolerance rate of the switch detection circuit can be effectively improved, the problem of diagnosis errors caused by the increase of the resistance value of the switch is avoided, the false alarm rate can be effectively reduced, the reliability of the switch detection circuit is improved, and therefore user experience can be effectively improved.
Description
Technical Field
The present disclosure relates to the field of electronic circuits, and in particular, to a switch detection circuit and a vehicle.
Background
When the existing switch detection circuit detects the switch state through voltage, a diagnosis voltage threshold value is usually set, the voltage value of a voltage detection point is compared with the diagnosis voltage threshold value, and if the voltage value of the voltage detection point is smaller than the diagnosis voltage threshold value, the switch detection circuit is determined to be in fault. However, since the switch may cause the resistance of the switch itself to increase due to oxidation, as the service life of the switch is prolonged, the resistance of each contact in the loop may increase due to oxidation, and as the service life of the switch increases, the power output capability of the switch also decreases, so that the voltage of the voltage detection point, which is collected even if the switch operates normally, is lower than the diagnosis threshold easily in the later period, thereby causing a problem of false alarm of the loop fault, and as the service life of the switch extends, the later period is the longer the false alarm frequency is, thereby causing a problem of poor user experience.
SUMMERY OF THE UTILITY MODEL
The invention aims to provide a switch detection circuit and a vehicle, and aims to solve the problems of high false alarm rate and poor fault tolerance of the conventional switch detection circuit.
In order to achieve the above object, in a first aspect of the present disclosure, there is provided a switch detection circuit including: the circuit comprises a low-voltage power supply, a first branch circuit, a second branch circuit and a control circuit, wherein the first branch circuit and the second branch circuit are connected in parallel and then are connected to two ends of the low-voltage power supply, the first branch circuit comprises a first reference voltage output end and a second reference voltage output end, and the second branch circuit comprises a low-voltage switch and a detection voltage output end;
the first reference voltage output end, the second reference voltage output end and the detection voltage output end are respectively connected with the input end of the control circuit, and the output end of the control circuit is used for being connected with a fault alarm device;
the control circuit is configured to control the fault alarm device to alarm when a first voltage output by the first reference voltage output end is smaller than a detection voltage output by the detection voltage output end, or a second voltage output by the second reference voltage output end is larger than the detection voltage, where the first voltage is larger than the second voltage.
Optionally, the control circuit comprises a first comparator and a second comparator,
the first reference voltage output end is connected with the inverting input end of the first comparator, the second reference voltage output end is connected with the normal phase input end of the second comparator, the normal phase input end of the first comparator and the inverting input end of the second comparator are both connected with the detection voltage output end, and the output end of the first comparator and the output end of the second comparator are both used for being connected with the fault alarm device.
Optionally, when the low-voltage switch is closed, the first voltage is greater than or equal to the detection voltage, the first comparator outputs a low level, the detection voltage is greater than or equal to the second voltage, the second comparator outputs a low level, and the fault alarm device does not trigger an alarm;
when the low-voltage switch is switched off, the first voltage and the second voltage are both greater than the detection voltage, the first comparator outputs a low level, the second comparator outputs a high level, and the second comparator controls the fault alarm device to alarm;
when the low-voltage switch is in a short circuit, the detection voltage is greater than the first voltage, the detection voltage is greater than the second voltage, the first comparator outputs a high level, the second comparator outputs a low level, and the first comparator controls the fault alarm device to alarm.
Optionally, the first branch circuit is formed by sequentially connecting a first resistor, a second resistor and a third resistor in series, the first reference voltage output end is formed by an outgoing line between the first resistor and the second resistor, and the second reference voltage output end is formed by an outgoing line between the second resistor and the third resistor.
Optionally, the second branch further comprises a fourth resistor,
one end of the fourth resistor is connected with the anode of the low-voltage power supply, the other end of the fourth resistor is connected with the cathode of the low-voltage power supply through the low-voltage switch, and the detection voltage output end is formed by a lead-out wire of the cathode of the low-voltage power supply.
Optionally, the second branch further comprises a first diode,
the anode of the first diode is connected with the anode of the low-voltage power supply, and the cathode of the first diode is connected with the fourth resistor.
Optionally, the detection voltage output end is further configured to be connected to a signal input device, a second diode is disposed between the detection voltage output end and the signal input device, an anode of the second diode is configured to be connected to the signal input device, and a cathode of the second diode is connected to the detection voltage output end;
the second diode is used for preventing the current of the detection voltage output end from flowing to the signal input device;
the signal input means for self-diagnosing the first comparator when a low level is output; self-diagnosis is performed on the second comparator when a high level is output.
Optionally, a third diode and a fourth diode are also included,
the anode of the third diode is connected with the output end of the first comparator, and the cathode of the third diode is used for connecting the fault alarm device; and the anode of the fourth diode is connected with the output end of the second comparator, and the cathode of the fourth diode is connected with the fault alarm device.
Optionally, a first capacitor and a second capacitor,
one end of the first capacitor is connected with the anode of the low-voltage power supply, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with the detection voltage output end, and the other end of the second capacitor is connected with the negative electrode of the low-voltage power supply.
In a second aspect of the present disclosure, there is provided a vehicle including the switch detection circuit described in the above first aspect.
According to the technical scheme, a diagnosis voltage threshold range is provided for diagnosis of the detection voltage through the first voltage output by the first reference voltage output end and the second voltage output by the second reference voltage output end, and the low-voltage switch is determined to be in a fault state under the condition that the detection voltage is in the diagnosis voltage threshold range, namely the detection voltage is greater than the first voltage or the detection voltage is less than the second voltage; when the first voltage is greater than the detection voltage and the detection voltage is greater than the second voltage, the low-voltage switch is determined to be in a normal working state, the fault tolerance rate of the switch detection circuit can be effectively improved, the problem of diagnosis errors caused by the increase of the resistance value of the switch is avoided, the false alarm rate can be effectively reduced, the reliability of the switch detection circuit is improved, and therefore user experience can be effectively improved.
Additional features and advantages of the disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a switch detection circuit shown in an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a switch detection circuit shown in accordance with the embodiment of FIG. 1 according to the present disclosure.
Detailed Description
The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.
Before describing the specific embodiments of the present disclosure in detail, an application scenario of the present disclosure is first described, and the present disclosure may be applied to detection of a low-voltage switch in a low-voltage circuit, or may be applied to detection of a high-voltage switch in a high-voltage circuit, and when detecting the high-voltage switch, the present disclosure may be used as a high-voltage interlock device to interlock and link the high-voltage switch and the low-voltage switch, so as to implement fault detection of the high-voltage switch in the high-voltage circuit as the high-voltage interlock device. High-voltage conduction in the high-voltage interlocking loop is realized through the high-voltage connector, so that the judgment on the state of the high-voltage connector is very important no matter the whole vehicle runs or the vehicle is maintained.
At present, the mode of judging the high-voltage connector generally needs to periodically acquire the voltage value of a low-voltage loop corresponding to high-voltage interlocking in millisecond level and transmit the voltage value to a controller such as a single chip microcomputer, the acquired voltage value is compared with a preset diagnosis voltage threshold value in the controller, and if the voltage value of a voltage detection point is smaller than the diagnosis voltage threshold value, the fault of a switch detection circuit is determined. However, since the switch may cause the resistance of the switch itself to increase due to oxidation, as the service life of the switch is prolonged, the resistance of each contact in the loop may increase due to oxidation, and as the service life of the switch increases, the power output capability of the switch also decreases, so that the voltage of the voltage detection point, which is collected even if the switch operates normally, is lower than the diagnosis threshold easily in the later period, thereby causing a problem of false alarm of the loop fault, and as the service life of the switch extends, the later period is the longer the false alarm frequency is, thereby causing a problem of poor user experience.
In order to solve the above technical problem, the present disclosure provides a switch detection circuit and a vehicle, the switch detection circuit providing a diagnostic voltage threshold range for diagnosis of a detection voltage by a first voltage output by a first reference voltage output terminal and a second voltage output by a second reference voltage output terminal, and determining that a low voltage switch is in a fault state in a case where the detection voltage is in the diagnostic voltage threshold range, that is, the detection voltage is greater than the first voltage, or the detection voltage is less than the second voltage; when the first voltage is greater than the detection voltage and the detection voltage is greater than the second voltage, the low-voltage switch is determined to be in a normal working state, the fault tolerance rate of the switch detection circuit can be effectively improved, the problem of diagnosis errors caused by the increase of the resistance value of the switch is avoided, the false alarm rate can be effectively reduced, the reliability of the switch detection circuit is improved, and therefore user experience can be effectively improved.
FIG. 1 is a schematic diagram of a switch detection circuit shown in an exemplary embodiment of the present disclosure; referring to fig. 1, the switch detection circuit includes: the low-voltage power supply comprises a low-voltage power supply 101, a first branch 102, a second branch 103 and a control circuit 104, wherein the first branch 102 and the second branch 103 are connected in parallel and then are connected to two ends of the low-voltage power supply 101, the first branch 102 comprises a first reference voltage output end A and a second reference voltage output end B, and the second branch 103 comprises a low-voltage switch K and a detection voltage output end C;
the first reference voltage output terminal a, the second reference voltage output terminal B and the detection voltage output terminal C are respectively connected to the input terminal of the control circuit 104, and the output terminal of the control circuit 104 is used for connecting the fault alarm device 105;
the control circuit 104 is configured to control the malfunction warning device 105 to warn when a first voltage output by the first reference voltage output terminal a is smaller than a detection voltage output by the detection voltage output terminal C, or a second voltage output by the second reference voltage output terminal B is larger than the detection voltage, where the first voltage is larger than the second voltage.
The failure alarm device 105 may be a single chip microcomputer controlled alarm, or may be an alarm element such as a buzzer, an electric bell, or a music player.
It should be noted that the switch detection circuit may be used for detecting a low-voltage switch in a low-voltage circuit, or may be used in a high-voltage circuit, and as a main circuit in a high-voltage interlock device, the switch detection circuit detects whether a fault exists in the high-voltage switch in the high-voltage circuit, and when the switch detection circuit works as the main circuit in the high-voltage interlock device, the low-voltage switch K may interlock and link with the high-voltage switch, that is, the low-voltage switch K and the high-voltage switch are simultaneously opened and closed, so that when the low-voltage switch K is determined to be opened, the high-voltage switch may also be determined to be opened, and thus, whether.
In this way, a diagnosis voltage threshold range is provided for diagnosis of the detection voltage through the first voltage output by the first reference voltage output end and the second voltage output by the second reference voltage output end, and the low-voltage switch is determined to be in a fault state under the condition that the detection voltage is in the diagnosis voltage threshold range, namely the detection voltage is greater than the first voltage or the detection voltage is less than the second voltage; when the first voltage is greater than the detection voltage and the detection voltage is greater than the second voltage, the low-voltage switch is determined to be in a normal working state, the fault tolerance rate of the switch detection circuit can be effectively improved, the problem of diagnosis errors caused by the increase of the resistance value of the switch is avoided, the false alarm rate can be effectively reduced, the reliability of the switch detection circuit is improved, and therefore user experience can be effectively improved.
FIG. 2 is a schematic diagram of a switch detection circuit shown in accordance with the embodiment of FIG. 1; referring to fig. 2, the control circuit 104 includes a first comparator 1041 and a second comparator 1042,
the first reference voltage output terminal a is connected to the inverting input terminal of the first comparator 1041, the second reference voltage output terminal B is connected to the non-inverting input terminal of the second comparator 1042, the non-inverting input terminal of the first comparator 1041 and the inverting input terminal of the second comparator 1042 are both connected to the detection voltage output terminal C, and the output terminal of the first comparator 1041 and the output terminal of the second comparator 1042 are both used for connecting the fault alarm device 105.
The first branch 102 is formed by sequentially connecting a first resistor R1, a second resistor R2 and a third resistor R3 in series, the first reference voltage output terminal a is formed by an outgoing line between the first resistor R1 and the second resistor R2, and the second reference voltage output terminal B is formed by an outgoing line between the second resistor R2 and the third resistor R3. The second branch 103 further includes a fourth resistor R4, one end of the fourth resistor R4 is connected to the positive electrode of the low voltage power source 101, the other end is connected to the negative electrode of the low voltage power source 101 through the low voltage switch K, and the detection voltage output terminal C is formed by a lead-out wire of the negative electrode of the low voltage power source 101.
It should be noted that by adjusting the resistance values of the first resistor R1, the second resistor R2, or the third resistor R3, when the low-voltage switch K is closed, the first voltage is greater than or equal to the detection voltage, the first comparator 1041 outputs a low level, the detection voltage is greater than or equal to the second voltage, the second comparator 1042 outputs a low level, and the malfunction alarm device 105 does not trigger an alarm; when the low voltage switch K is turned off, the first voltage and the second voltage are both greater than the detection voltage, the first comparator 1041 outputs a low level, the second comparator 1042 outputs a high level, and the second comparator 1042 controls the fault alarm device 105 to alarm; when the low voltage switch K is short-circuited, the detection voltage is greater than the first voltage, and the detection voltage is greater than the second voltage, the first comparator 1041 outputs a high level, the second comparator 1042 outputs a low level, and the first comparator 1041 controls the malfunction alarm device 105 to alarm.
In addition, the fourth resistor R4 is arranged to reduce the current of the second branch 103, so that the safety of the switch detection circuit can be improved, the control circuit is formed by the first comparator 1041 and the second comparator 1042, so that the problem that in the related art, when it is determined whether a fault exists in a loop by a control program, a sampling signal needs to be triggered every millisecond period to obtain the voltage of a collection point can be effectively avoided, and because the control Logic is executed by the first comparator 1041 and the second comparator 1042, a single chip microcomputer, a Programmable Logic Controller (PLC) and other control elements which execute the control Logic by the control program are not needed, so that the complexity of the control process can be effectively reduced, the phenomenon of false alarm caused by the error of the control program can be avoided, and the reliability of the switch detection circuit can be effectively improved.
Optionally, the second branch 103 further includes a first diode D1, an anode of the first diode D1 is connected to the anode of the low voltage power source 101, and a cathode of the first diode D1 is connected to the fourth resistor R4.
The detection voltage output terminal C is further used for connecting a signal input device 106, a second diode D2 is arranged between the detection voltage output terminal C and the signal input device 106, an anode of the second diode D2 is used for connecting the signal input device 106, and a cathode of the second diode D2 is connected to the detection voltage output terminal C;
the second diode D2 for preventing the current of the detection voltage output terminal C from flowing to the signal input device 106;
the signal input device 106 for self-diagnosing the first comparator 1041 when outputting a low level; when a high level is output, self-diagnosis is performed on the second comparator 1042.
Wherein, the self-diagnosis process may be that, in the case that the low voltage switch K is turned off, a high level signal is output through the signal input device 106, the high level signal may be a voltage signal greater than the first voltage, since the first voltage is greater than the second voltage under the partial pressure of the second resistor R2 in the first branch 102, since the high level is input to the detection voltage output terminal C, the voltage of the detection voltage output terminal C is greater than the first voltage, and the first comparator 1041 outputs a high level, so that the malfunction alarm device 105 alarms; meanwhile, since the voltage at the detection voltage output terminal C is also greater than the second voltage, the second comparator outputs a low level, and the malfunction alarm device 105 does not alarm, so that when the signal input device 106 outputs a high level signal, if it is determined that the malfunction alarm device 105 alarms, it can be determined that the first comparator 1041 is in a normal state, thereby completing self-diagnosis of the first comparator 1041. When the second comparator 1042 is self-diagnosed, the signal input device 106 outputs a low level signal, which may be a voltage signal smaller than the second voltage, and the voltage of the detection voltage output terminal C is smaller than the second voltage, so that the second comparator outputs a high level, which enables the malfunction alarm device 105 to alarm, and since the voltage of the detection voltage output terminal C is smaller than the first voltage, the first comparator 1041 outputs a low level, the malfunction alarm device 105 does not trigger an alarm; therefore, when the signal input device 106 outputs a low level signal, if it is determined that the malfunction alerting device 105 is alerting, it is possible to determine that the second comparator 1042 is in a normal state, thereby completing self-diagnosis of the second comparator 1042.
It should be noted that the signal input device 106 may be any device capable of outputting a high level and a low level, and may be, for example, a single chip, a PLC, a rectifier, or the like. The first diode D1 is used to ensure the flowing direction of the current in the second branch 103 to avoid the electric signal from flowing from the detection voltage output terminal C to the positive pole of the low voltage power supply 101 when the signal input device 106 outputs high level, and the second diode D2 is used to prevent the current from flowing from the detection voltage output terminal C to the signal input device 106.
Therefore, the self-diagnosis function is added in the switch detection circuit, and the control circuit can be self-diagnosed conveniently and rapidly, so that the self-fault of the switch detection circuit can be discharged rapidly, and the user experience can be effectively improved.
Optionally, a third diode D3 and a fourth diode D4 are also included,
the anode of the third diode D3 is connected to the output terminal of the first comparator 1041, and the cathode of the third diode D3 is used to connect the malfunction alerting device 105; the anode of the fourth diode D4 is connected to the output terminal of the second comparator 1042, and the cathode of the fourth diode D4 is connected to the malfunction alerting device 105.
The third diode D3 is arranged to avoid the interference of the signal output by the second comparator 1042 on the first comparator 1041, and also to avoid the current in the fault alarm device 105 flowing to the first comparator 1041, so as to protect the first comparator 1041 to a certain extent, and thus, the reliability of the switch detection circuit can be effectively improved. Similarly, the fourth diode D4 is provided to avoid the interference of the signal output by the first comparator 1041 to the second comparator 1042, and also to avoid the current in the fault alarm device 105 flowing to the second comparator 1042 to protect the second comparator 1042 to a certain extent, which is helpful to improve the reliability of the switch detection circuit.
Optionally, a first capacitor C1 and a second capacitor C2 are also included,
one end of the first capacitor C1 is connected to the positive electrode of the low voltage power supply 101, and the other end is grounded;
one end of the second capacitor C2 is connected to the detection voltage output terminal C, and the other end is connected to the negative electrode of the low voltage power source 101.
It should be noted that the first capacitor C1 and the second capacitor C2 are used for filtering to avoid interference of other signals to the output voltages of the first reference voltage output terminal a, the second reference voltage output terminal B and the detection voltage output terminal C, so as to effectively improve the stability of the switch detection circuit.
In the above technical solution, the control circuit is formed by the first comparator 1041 and the second comparator 1042, which can effectively reduce the complexity of the control process and avoid the occurrence of false alarm for the error of the control program; the self-diagnosis of the switch detection circuit is realized by arranging the signal input device 106, and the self-diagnosis of the control circuit can be conveniently and quickly carried out, so that the self-fault of the switch detection circuit can be quickly eliminated, and the user experience can be effectively improved; the reliability of the switch detection circuit can be improved by arranging the first diode D1, the second diode D2, the third diode D3 and the fourth diode D4, and the stability of the switch detection circuit can be improved by the first capacitor C1 and the second capacitor C2.
In another exemplary embodiment of the present disclosure, a vehicle is provided that includes the switch detection circuit described above with respect to fig. 1 or 2.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.
Claims (10)
1. A switch detection circuit, comprising: the circuit comprises a low-voltage power supply, a first branch circuit, a second branch circuit and a control circuit, wherein the first branch circuit and the second branch circuit are connected in parallel and then are connected to two ends of the low-voltage power supply, the first branch circuit comprises a first reference voltage output end and a second reference voltage output end, and the second branch circuit comprises a low-voltage switch and a detection voltage output end;
the first reference voltage output end, the second reference voltage output end and the detection voltage output end are respectively connected with the input end of the control circuit, and the output end of the control circuit is used for being connected with a fault alarm device;
the control circuit is configured to control the fault alarm device to alarm when a first voltage output by the first reference voltage output end is smaller than a detection voltage output by the detection voltage output end, or a second voltage output by the second reference voltage output end is larger than the detection voltage, where the first voltage is larger than the second voltage.
2. The switch detect circuit of claim 1, wherein the control circuit comprises a first comparator and a second comparator,
the first reference voltage output end is connected with the inverting input end of the first comparator, the second reference voltage output end is connected with the normal phase input end of the second comparator, the normal phase input end of the first comparator and the inverting input end of the second comparator are both connected with the detection voltage output end, and the output end of the first comparator and the output end of the second comparator are both used for being connected with the fault alarm device.
3. The switch detect circuit of claim 2,
when the low-voltage switch is closed, the first voltage is greater than or equal to the detection voltage, the first comparator outputs a low level, the detection voltage is greater than or equal to the second voltage, the second comparator outputs a low level, and the fault alarm device does not trigger an alarm;
when the low-voltage switch is switched off, the first voltage and the second voltage are both greater than the detection voltage, the first comparator outputs a low level, the second comparator outputs a high level, and the second comparator controls the fault alarm device to alarm;
when the low-voltage switch is in a short circuit, the detection voltage is greater than the first voltage, the detection voltage is greater than the second voltage, the first comparator outputs a high level, the second comparator outputs a low level, and the first comparator controls the fault alarm device to alarm.
4. The switch detection circuit according to claim 1, wherein the first branch is formed by a first resistor, a second resistor, and a third resistor connected in series in this order, the first reference voltage output terminal is formed by an outgoing line between the first resistor and the second resistor, and the second reference voltage output terminal is formed by an outgoing line between the second resistor and the third resistor.
5. The switch detect circuit of claim 1, wherein the second branch further comprises a fourth resistor,
one end of the fourth resistor is connected with the anode of the low-voltage power supply, the other end of the fourth resistor is connected with the cathode of the low-voltage power supply through the low-voltage switch, and the detection voltage output end is formed by a lead-out wire of the cathode of the low-voltage power supply.
6. The switch detect circuit of claim 5, wherein the second branch further comprises a first diode,
the anode of the first diode is connected with the anode of the low-voltage power supply, and the cathode of the first diode is connected with the fourth resistor.
7. The switch detection circuit according to claim 1, wherein the detection voltage output terminal is further configured to be connected to a signal input device, a second diode is disposed between the detection voltage output terminal and the signal input device, an anode of the second diode is configured to be connected to the signal input device, and a cathode of the second diode is connected to the detection voltage output terminal;
the second diode is used for preventing the current of the detection voltage output end from flowing to the signal input device;
the signal input means for self-diagnosing the first comparator when a low level is output; self-diagnosis is performed on the second comparator when a high level is output.
8. The switch detect circuit of claim 2, further comprising a third diode and a fourth diode,
the anode of the third diode is connected with the output end of the first comparator, and the cathode of the third diode is used for connecting the fault alarm device; and the anode of the fourth diode is connected with the output end of the second comparator, and the cathode of the fourth diode is connected with the fault alarm device.
9. The switch detection circuit of any of claims 1-8, further comprising a first capacitance and a second capacitance,
one end of the first capacitor is connected with the anode of the low-voltage power supply, and the other end of the first capacitor is grounded;
one end of the second capacitor is connected with the detection voltage output end, and the other end of the second capacitor is connected with the negative electrode of the low-voltage power supply.
10. A vehicle characterized by comprising a switch detection circuit according to any one of claims 1 to 9 above.
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|---|---|---|---|
| CN202021244090.6U CN212586508U (en) | 2020-06-29 | 2020-06-29 | Switch detection circuit and vehicle |
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| CN202021244090.6U CN212586508U (en) | 2020-06-29 | 2020-06-29 | Switch detection circuit and vehicle |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933699A (en) * | 2021-10-18 | 2022-01-14 | 杭州优恩捷科技有限公司 | High-reliability passive switch on-off state detection circuit |
| CN113985856A (en) * | 2021-11-16 | 2022-01-28 | 广西电网有限责任公司电力科学研究院 | Temperature controller switching value detection device |
-
2020
- 2020-06-29 CN CN202021244090.6U patent/CN212586508U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113933699A (en) * | 2021-10-18 | 2022-01-14 | 杭州优恩捷科技有限公司 | High-reliability passive switch on-off state detection circuit |
| CN113933699B (en) * | 2021-10-18 | 2023-09-26 | 杭州优恩捷科技有限公司 | High-reliability passive switch on-off state detection circuit |
| CN113985856A (en) * | 2021-11-16 | 2022-01-28 | 广西电网有限责任公司电力科学研究院 | Temperature controller switching value detection device |
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