CN214122434U - Circuit state detection circuit with circuit control device and circuit system - Google Patents
Circuit state detection circuit with circuit control device and circuit system Download PDFInfo
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- CN214122434U CN214122434U CN202022190274.5U CN202022190274U CN214122434U CN 214122434 U CN214122434 U CN 214122434U CN 202022190274 U CN202022190274 U CN 202022190274U CN 214122434 U CN214122434 U CN 214122434U
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Abstract
The utility model provides a detection circuitry and circuit system of circuit state with circuit control device. The detection circuit includes: a switching circuit; a load resistance; the switching circuit, the load resistor and the switching device are connected in series to form a detection loop; the switch device can be electrically connected to the rear end of the circuit control device of the tested circuit and is used for detecting a voltage signal at the rear end of the circuit control device; the switch device switches on or off the detection loop according to whether the voltage at the rear end of the circuit control device is zero or not; the switch circuit outputs different signals according to whether the current on the load resistor is zero or not. In the utility model, the switch device switches on or off the detection loop according to whether the voltage at the rear end of the circuit control device is zero or not; the switch circuit detects the current signal of the load resistor on the detection loop and judges the current states of the circuit control device and the circuit to be detected. The detection circuit may support a circuit under test that detects voltage signals of different levels.
Description
Technical Field
The utility model relates to a detection circuitry and circuit system of circuit state with circuit control device.
Background
At present, a switching circuit only supports a tested circuit system with a voltage signal of 12V, the 12V voltage signal of the tested circuit can be directly connected to a pin of the switching circuit, and the switching circuit can judge the state of the tested circuit by detecting the voltage signal of the tested circuit.
However, because the pins of the switch circuit have a voltage withstand requirement, the input voltage of the circuit under test cannot exceed the self-power input voltage of the switch circuit, and thus the switch circuit cannot support the circuit under test with a voltage signal greater than 12V.
SUMMERY OF THE UTILITY MODEL
One of the objects of the present invention is to provide a circuit state detection circuit and a circuit system with a circuit control device to overcome the deficiencies in the prior art.
In order to achieve the above purpose, the utility model discloses a following technical scheme realizes:
according to a first aspect of the present invention, a detection circuit for a circuit state with a circuit control device is provided. The detection circuit includes:
a switching circuit;
a load resistance; and
a switching device, the switching circuit, the load resistance and the switching device being arranged in series to form a detection loop;
the switch device is configured to be electrically connected to a circuit control device back end of the circuit to be tested and used for detecting a voltage signal of the circuit control device back end;
the switching device is configured to turn on or off the detection circuit according to whether a voltage at a rear end of the circuit control apparatus is zero;
the switch circuit is configured to output different signals according to whether the current on the load resistor is zero or not.
Optionally, the switching circuit is connected to a first power supply, and the switching device is grounded, so that the switching circuit, the load resistor and the switching device are connected in series to form the detection loop;
when the circuit control device controls the conduction of the tested circuit, the switch device conducts the detection loop, the current on the load resistor is not zero, and the switch circuit outputs a high-level signal;
when the circuit control device controls the circuit to be detected to be disconnected, the switch device disconnects the detection loop, the current on the load resistor is zero, and the switch circuit outputs a low-level signal.
Optionally, the number of the switching devices and the number of the load resistors are multiple and correspond to one another;
one end of one of the load resistors is connected in series to the switch circuit, and the other end of the load resistor is connected in series to the corresponding switch device, so that the detection loop is formed.
Optionally, further comprising processing circuitry;
the switching circuit is electrically connected to the processing circuit, and the switching circuit outputs different signals to the processing circuit.
Optionally, the switching circuit is electrically connected to the processing circuit through a serial peripheral interface.
Optionally, the switching device is a MOS transistor.
Optionally, the switching circuit is a multi-way switching circuit;
the detection circuit is a multi-path detection circuit, and each path of the multi-path detection circuit comprises the load resistor, the switch device and one path of switch circuit in the multi-path switch circuit.
According to a second aspect of the present invention, a circuit system is provided. The circuit system includes:
the circuit to be tested is provided with a circuit control device, and the circuit control device is used for controlling the circuit to be tested to be switched on or switched off; and
the above-described detection circuit;
the switching device is electrically connected to the rear end of the circuit control device of the tested circuit and is used for detecting a voltage signal at the rear end of the tested circuit control device;
the switch device switches on or off the detection loop according to whether the voltage at the rear end of the circuit control device is zero or not;
and the switching circuit outputs different signals according to whether the current on the load resistor is zero or not.
Optionally, when the circuit control device controls the circuit to be tested to be turned on, the switching device turns on the detection loop, the current on the load resistor is not zero, and the switching circuit outputs a high-level signal;
when the circuit control device controls the circuit to be detected to be disconnected, the switch device disconnects the detection loop, the current on the load resistor is zero, and the switch circuit outputs a low level signal.
Optionally, a first voltage-dividing resistor and a second voltage-dividing resistor are connected in series with the rear end of the circuit control device on the tested circuit;
the switching device is electrically connected to any point between the first voltage-dividing resistor and the second voltage-dividing resistor and is used for detecting the voltage value of any point between the first voltage-dividing resistor and the second voltage-dividing resistor;
the switching device turns on or off the detection circuit according to whether a voltage value at any point between the first voltage-dividing resistor and the second voltage-dividing resistor is zero or not.
Optionally, the circuit control device is a relay and/or a fuse.
Optionally, the circuit under test is a control circuit in a central electrical box for a vehicle.
The utility model provides an among the detection circuitry and the circuit system of circuit state with circuit control device, switching circuit, load resistance and the switching device series connection among the detection circuitry set to the detection return circuit. The switch device switches on or off the detection loop according to whether the voltage at the rear end of the circuit control device is zero or not, and the switch circuit outputs different signals according to whether the current signal on the load resistor on the detection loop is zero or not so as to judge the current states of the circuit control device and the circuit to be detected. The switch circuit does not directly detect the voltage signal of the tested circuit, but detects the current signal of the load resistor on the detection loop, and the detection circuit supports the tested circuit for detecting voltage signals of different grades.
The rear end of the circuit control device on the tested circuit can be connected with a first divider resistor and a second divider resistor in series, and the switching device detects the voltage value of any point between the first divider resistor and the second divider resistor. The voltage value of any point between the first voltage-dividing resistor and the second voltage-dividing resistor is low, and the switch device cannot be damaged. The detection circuit supports a circuit under test that detects voltage signals of different levels.
Drawings
Fig. 1 is a schematic diagram of a circuit system according to an embodiment of the present invention, in which a circuit control device turns on a circuit to be tested.
FIG. 2 is a schematic diagram of the circuit control apparatus in the circuit system of FIG. 1 disconnecting the circuit under test.
Fig. 3 is a circuit diagram of the circuit system of fig. 1.
Detailed Description
According to an aspect of the present invention, a circuit system is provided. Referring to fig. 1 and 2, the circuit system 1 includes a circuit under test 10 and a detection circuit 20.
The circuit 10 to be tested is provided with a circuit control device 12, and the circuit control device 12 is used for controlling the circuit 10 to be tested to be switched on or switched off. The circuit control device 12 can be embodied as a relay and/or a fuse.
The two ends of the circuit control device 12 on the circuit under test 10 are the front end and the back end 122, respectively. The circuit 10 under test inputs the voltage signal at the front end of the circuit control device 12.
The detection circuit 20 may be used to detect the circuit state of the circuit under test 10. The detection circuit 20 includes a switching circuit 26, a load resistor R1, and a switching device 22. The switching circuit 26 may specifically include an input pin and an output pin, the input pin being connectable to the output pin.
The switching circuit 26, the load resistor R1 and the switching device 22 are arranged in series in a sensing loop. One end of the detection loop is connected with an input power supply, and the other end of the detection loop can be grounded.
The switching device 22 is electrically connected to the back end 122 of the circuit control apparatus 12 of the circuit under test 10 for detecting a voltage signal at the back end 122 of the circuit control apparatus 12 of the circuit 20. The switching device 22 may turn the detection loop on or off depending on whether the voltage at the back end 122 of the circuit control means 12 is zero or not. Preferably, the switching device 22 may be configured as a MOS transistor. The MOS transistor is also called a field effect transistor, i.e., an insulating field effect transistor in an integrated circuit. The MOS tube is used as a switching element and can work in an off state or an on state. Because the MOS tube is a voltage control element, the MOS tube can be switched between an off state and an on state according to different voltage signals.
The input pin of the switching circuit 26 may be electrically connected to the load resistor R1 to detect the current across the load resistor R1. The switching circuit 26 outputs a different signal depending on whether the current through the load resistor R1 is zero. The circuit state of the circuit 10 under test can be judged and detected according to different signals output by the switch circuit 26.
To complete the circuit for the detection circuit 20, the switching circuit 26 may be connected to the first power supply 30 and the switching device 22 may be connected to ground, such that the switching circuit 26, the load resistor R1, and the switching device 22 are arranged in series to form the detection circuit.
Referring to fig. 1, when the circuit control device 12 controls the circuit 10 to be tested to be turned on, the switching device 22 is in a conducting state, and at this time, the switching device 22 conducts the detection loop, the current on the load resistor R1 is not zero, and the switching circuit 26 outputs a high level signal.
Referring to fig. 2, when the circuit control device 12 controls the circuit 10 to be tested to be turned off, the switching device 22 is in the off state, and at this time, the switching device 22 opens the detection loop, the current on the load resistor R1 is zero, and the switching circuit 26 outputs a low level signal.
The circuit state of the circuit 10 under test can be determined and detected according to the level of the output of the switch circuit 26. When the switching circuit 26 outputs a high level, the switching device 22 is in an off state and opens the detection loop. When the switching circuit 26 outputs a low level, the switching device 22 is in a conductive state and turns on the detection loop.
As shown, the detection circuit 20 may also include a processing circuit 28. An output pin of the switching circuit 26 is electrically connected to the processing circuit 28, and the switching circuit 26 outputs different signals to the processing circuit 28. Processing circuitry 28 may implement corresponding responses based on the different signals received. When the circuit control device 12 is in different states, the switching circuit 26 outputs different signals to the processing circuit 28. For example, the processing circuit 28 may be provided with a microcontroller that processes or converts the signals input by the switching circuit 26 and outputs the signals.
As shown, switching circuit 26 may be electrically connected to processing circuit 28 through a serial peripheral interface. The switching circuit 26 adopts a serial control mode, so that connecting wires can be saved. Switching circuitry 26 may communicate bi-directionally with processing circuitry 28 via a Serial Peripheral Interface (SPI).
Referring to fig. 3, the number of the switching devices 22 and the load resistors R1 may be plural and correspond to one another. One end of one of the load resistors R1 is connected in series to the switching circuit 26, and the other end is connected in series to the corresponding switching device 22, forming a detection loop. For example, different load resistors R1 may be connected to different input pins on the switching circuit 26.
Correspondingly, the switching circuit 26 may be provided as a multi-way switching circuit. The detection circuit 20 is a multi-path detection circuit. Each of the multiple sensing circuits includes a load resistor R1, a switching device 22, and one of the multiple switching circuits 26. Thus, the multi-path detection circuit can simultaneously detect the circuit states of the multi-path tested circuit.
As shown, the switching circuit 26 needs to be stably powered to achieve reliable detection in real time. The detection circuit 20 may also include a second power supply 32. When the switching device 22 turns on or off the detection loop, the second power supply 32 can always supply power to the switching circuit 26, so that the switching circuit 26 can output different signals according to whether the current on the load resistor R1 is zero or not.
As shown, excessive voltage generally causes damage to the switching device 22. To prevent the higher voltage on the circuit under test 10 from damaging the switching device 22, the back end 122 of the circuit control device 12 on the circuit under test 10 may be connected in series with a voltage divider circuit. Specifically, the back end 122 of the circuit control device 12 on the circuit under test 10 is connected in series with a first voltage dividing resistor R3 and a second voltage dividing resistor R4. The switching device 22 is electrically connected to any point of the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4, and is configured to detect a voltage value at any point between the first voltage-dividing resistor R3 and the second voltage-dividing resistor R4. The input voltage signal of the circuit 10 under test can be divided by the voltage dividing circuit, and the voltage value at any point between the first voltage dividing resistor R3 and the second voltage dividing resistor R4 is low, so that the switch device 22 is not damaged.
The circuit under test 10 in this embodiment may be a control circuit in a central electrical box for a vehicle. The detection circuit 20 may detect the state of the circuit control means 12 on the control circuit. For example, the circuit control device 12 may be a relay and/or a fuse on a control circuit in a central electrical box for a vehicle.
In one embodiment, as shown in the figure, the circuit control device 12 is specifically described as a fuse. The input voltage signal of the circuit under test may be 24V. The switching circuit 26 is connected to a 12V first power supply 30 to provide a supply voltage for the detection loop. The switching circuit 26 is a second power supply 32 which is connected to 5V for satisfying self operation.
When the fuse un-blown control circuit 10 is turned on, the voltage signal at the back end 122 of the circuit control device 12 is not zero. The switching device 22 is in a conducting state according to the non-zero voltage signal, at this time, the switching device 22 conducts the detection loop, the current on the load resistor R1 is non-zero, and the switching circuit 26 outputs a high level signal. At this time, the high level signal output from the switch circuit 26 can determine that the fuse on the circuit under test is in an unblown state.
When the circuit 10 is open, the voltage signal at the back end 122 of the circuit control device 12 is zero. The switching device 22 is in an off state according to the zero voltage signal, and the switching device 22 opens the detection loop, the current of the load resistor R1 is zero, and the switching circuit 26 outputs a low level signal. At this time, it can be determined that the fuse on the circuit under test is in a blown state according to the low level signal output from the switch circuit 26.
The utility model discloses in, switching circuit, load resistance and the switching device series connection among the detection circuitry set to the detection return circuit. The switch device switches on or off the detection loop according to whether the voltage at the rear end of the circuit control device is zero or not, and the switch circuit outputs different signals according to whether the current signal on the load resistor on the detection loop is zero or not so as to judge the current states of the circuit control device and the circuit to be detected. The switch circuit does not directly detect the voltage signal of the tested circuit, but detects the current signal of the load resistor on the detection loop, and the detection circuit supports the tested circuit for detecting voltage signals of different grades.
The rear end of the circuit control device on the tested circuit can be connected with a first divider resistor and a second divider resistor in series, and the switching device detects the voltage value of any point between the first divider resistor and the second divider resistor. The voltage value of any point between the first voltage-dividing resistor and the second voltage-dividing resistor is low, and the switch device cannot be damaged. The detection circuit supports a circuit under test that detects voltage signals of different levels.
The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, and any modification, equivalent replacement or improvement within the spirit of the present invention is encompassed by the claims of the present invention.
Claims (12)
1. A circuit for detecting a state of a circuit having a circuit control device, comprising:
a switching circuit;
a load resistance; and
a switching device, the switching circuit, the load resistance and the switching device being arranged in series to form a detection loop;
the switch device is configured to be electrically connected to a circuit control device back end of the circuit to be tested and used for detecting a voltage signal of the circuit control device back end;
the switching device is configured to turn on or off the detection circuit according to whether a voltage at a rear end of the circuit control apparatus is zero;
the switch circuit is configured to output different signals according to whether the current on the load resistor is zero or not.
2. The detection circuit of claim 1, wherein:
the switch circuit is connected to a first power supply, the switch device is grounded, and the switch circuit, the load resistor and the switch device are connected in series to form the detection loop;
when the circuit control device controls the conduction of the tested circuit, the switch device conducts the detection loop, the current on the load resistor is not zero, and the switch circuit outputs a high-level signal;
when the circuit control device controls the circuit to be detected to be disconnected, the switch device disconnects the detection loop, the current on the load resistor is zero, and the switch circuit outputs a low-level signal.
3. The detection circuit of claim 1, wherein:
the number of the switch devices and the load resistors is multiple and the switch devices and the load resistors correspond to each other one by one;
one end of one of the load resistors is connected in series to the switch circuit, and the other end of the load resistor is connected in series to the corresponding switch device, so that the detection loop is formed.
4. The detection circuit of claim 1, further comprising a processing circuit;
the switching circuit is electrically connected to the processing circuit, and the switching circuit outputs different signals to the processing circuit.
5. The detection circuit of claim 4, wherein:
the switching circuit is electrically connected to the processing circuit through a serial peripheral interface.
6. The detection circuit of claim 1, wherein:
the switching device is an MOS tube.
7. The detection circuit according to any one of claims 1 to 6, wherein:
the switch circuit is a multi-path switch circuit;
the detection circuit is a multi-path detection circuit, and each path of the multi-path detection circuit comprises the load resistor, the switch device and one path of switch circuit in the multi-path switch circuit.
8. Circuitry, comprising:
the circuit to be tested is provided with a circuit control device, and the circuit control device is used for controlling the circuit to be tested to be switched on or switched off; and
the detection circuit according to any one of claims 1 to 7;
the switching device is electrically connected to the rear end of the circuit control device of the tested circuit and is used for detecting a voltage signal at the rear end of the tested circuit control device;
the switch device switches on or off the detection loop according to whether the voltage at the rear end of the circuit control device is zero or not;
and the switching circuit outputs different signals according to whether the current on the load resistor is zero or not.
9. The circuitry of claim 8, wherein:
when the circuit control device controls the circuit to be tested to be conducted, the switch device conducts the detection loop, the current on the load resistor is not zero, and the switch circuit outputs a high-level signal;
when the circuit control device controls the circuit to be detected to be disconnected, the switch device disconnects the detection loop, the current on the load resistor is zero, and the switch circuit outputs a low level signal.
10. The circuitry of claim 8, wherein:
the rear end of the circuit control device on the tested circuit is connected with a first voltage-dividing resistor and a second voltage-dividing resistor in series;
the switching device is electrically connected to any point between the first voltage-dividing resistor and the second voltage-dividing resistor and is used for detecting the voltage value of any point between the first voltage-dividing resistor and the second voltage-dividing resistor;
the switching device turns on or off the detection circuit according to whether a voltage value at any point between the first voltage-dividing resistor and the second voltage-dividing resistor is zero or not.
11. The circuitry of claim 8, wherein:
the circuit control device is a relay and/or a fuse.
12. The circuitry of claim 8, wherein:
the tested circuit is a control circuit in the vehicle central electrical box.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022190274.5U CN214122434U (en) | 2020-09-29 | 2020-09-29 | Circuit state detection circuit with circuit control device and circuit system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022190274.5U CN214122434U (en) | 2020-09-29 | 2020-09-29 | Circuit state detection circuit with circuit control device and circuit system |
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| Publication Number | Publication Date |
|---|---|
| CN214122434U true CN214122434U (en) | 2021-09-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022190274.5U Active CN214122434U (en) | 2020-09-29 | 2020-09-29 | Circuit state detection circuit with circuit control device and circuit system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114911664A (en) * | 2022-07-18 | 2022-08-16 | 上海泰矽微电子有限公司 | Multi-power supply switching SOC test method and system |
-
2020
- 2020-09-29 CN CN202022190274.5U patent/CN214122434U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114911664A (en) * | 2022-07-18 | 2022-08-16 | 上海泰矽微电子有限公司 | Multi-power supply switching SOC test method and system |
| CN114911664B (en) * | 2022-07-18 | 2022-09-30 | 上海泰矽微电子有限公司 | Multi-path power supply switching SOC test method and system |
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