CN217879406U - Circuit and detection system for detecting power frequency alternating current and direct current - Google Patents
Circuit and detection system for detecting power frequency alternating current and direct current Download PDFInfo
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- CN217879406U CN217879406U CN202221362958.1U CN202221362958U CN217879406U CN 217879406 U CN217879406 U CN 217879406U CN 202221362958 U CN202221362958 U CN 202221362958U CN 217879406 U CN217879406 U CN 217879406U
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Abstract
The utility model discloses a circuit and a detection system for detecting power frequency alternating current and direct current, wherein the circuit comprises resistors R1, R2, R3 and R4, voltage stabilizing diodes D1, D2, D3 and D4 and an isolation collector U1; the resistors R1 and R2 are connected in parallel, the voltage stabilizing diodes D1 and D2 are connected in series to form a diode group, and the voltage stabilizing diodes D3 and D4 are connected in parallel to form a parallel diode; the isolation collector U1 is provided with a first pin, a second pin, a third pin and a fourth pin. The utility model has the characteristics of simple and reliable circuit, low cost, high reliability and high voltage detection range; moreover, the utility model designs isolation protection in the circuit, so as to safely isolate the test circuit from the result output circuit and avoid the circuit from being burnt out by high voltage detection; the test response speed of the circuit is less than 0.2 second, and the circuit is suitable for various application scenes and supports flexible matching with various monitoring systems.
Description
Technical Field
The utility model belongs to the technical field of the cable current detects technique and specifically relates to a detect power frequency alternating current and direct current's circuit.
Background
According to the requirements of the specifications of railway signal maintenance rules and the like, at least one pair of spare core wires must be reserved on a railway signal cable; when the core wire in use has insulation and other unexpected faults, the standby core wire is switched to the core wire in use in time, and smoothness of signal transmission is ensured.
When the spare core wire is switched to the active core wire, whether the cable is electrified or not needs to be detected. On one hand, whether the spare core wire is occupied is confirmed, and on the other hand, the cable is ensured not to carry power frequency alternating current and direct current high voltage. The existing manual detection mode may cause harm to operators or equipment, and has a larger improvement space.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a detect power frequency alternating current and direct current's circuit.
The utility model claims to protect a circuit for detecting power frequency alternating current and direct current, which comprises resistors R1, R2, R3 and R4, voltage stabilizing diodes D1, D2, D3 and D4 and an isolation collector U1;
the resistors R1 and R2 are connected in parallel, the voltage stabilizing diodes D1 and D2 are connected in series to form a diode group, and the voltage stabilizing diodes D3 and D4 are connected in parallel to form a parallel diode; the isolation collector U1 is provided with a first pin, a second pin, a third pin and a fourth pin;
the parallel input end of the R1R2 is electrically connected with the tested cable 1, the parallel output end of the R1R2 is electrically connected with the D1 end of the diode group D1D2, and the D2 end of the diode group D1D2 is electrically connected with the common end COM; the input end of the parallel diode D3D4 is electrically connected with the parallel output end of the R1R 2; the output end of the parallel diode D3D4 is electrically connected with a first pin of the isolation collector U1; a second pin of the isolation collector is electrically connected with one end of a resistor R3, the other end of the resistor R3 is electrically connected with a common end COM, a third pin of the isolation collector is electrically connected with a ground GND of the detection system, and a fourth pin of the isolation collector is electrically connected with one end of a resistor R4; the other end of the resistor R4 is electrically connected with a power supply VCC; the fourth pin of the isolation collector and one end of the resistor R4 are electrically connected with the output end of the circuit.
Further, the output signal of the circuit output end comprises a high level signal and a low level signal.
Further, the detection system ground is a power supply negative reference potential.
Further, the response time of the isolation collector U1 is less than 0.1 second.
Further, the voltage stabilizing parameters of the voltage stabilizing diodes D1, D2, D3 and D4 are adjustable.
Further, the common end is electrically connected with the earth PE or the tested cable 2.
Further, the detection range of the circuit for detecting the power frequency alternating current and the direct current is as follows: alternating current of 10V-400V and direct current of 10V-500V.
The utility model also discloses a detecting system, including a circuit that detects power frequency alternating current and direct current among the detecting system.
Above-mentioned the utility model provides a technical scheme has following advantage: the utility model has the characteristics of simple and reliable circuit, low cost, high reliability and high voltage detection range; moreover, the utility model designs isolation protection in the circuit, so as to safely isolate the test circuit from the result output circuit and avoid the circuit from being burnt out by high voltage detection; the test response speed of the circuit is less than 0.2 second, and the circuit is suitable for various application scenes and supports flexible matching with various monitoring systems.
Drawings
Fig. 1 is a block diagram of the whole structure of the circuit for detecting power frequency ac and dc according to the present invention.
Detailed Description
The step numbers in the present embodiment are set for convenience of illustration only, the order between the steps is not limited at all, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.
Referring to fig. 1, this embodiment describes a basic structure of a circuit for detecting power frequency ac and dc, which includes resistors R1, R2, R3, and R4, zener diodes D1, D2, D3, and D4, and an isolation collector U1;
the resistors R1 and R2 are connected in parallel, the voltage stabilizing diodes D1 and D2 are connected in series to form a diode group, and the voltage stabilizing diodes D3 and D4 are connected in parallel to form a parallel diode; the isolation collector U1 is provided with a first pin, a second pin, a third pin and a fourth pin;
the parallel input end of the R1R2 is electrically connected with the tested cable 1, the parallel output end of the R1R2 is electrically connected with the D1 end of the diode group D1D2, and the D2 end of the diode group D1D2 is electrically connected with the common end COM; the input end of the parallel diode D3D4 is electrically connected with the parallel output end of the R1R 2; the output end of the parallel diode D3D4 is electrically connected with a first pin of the isolation collector U1; a second pin of the isolation collector is electrically connected with one end of a resistor R3, the other end of the resistor R3 is electrically connected with a common end COM, a third pin of the isolation collector is electrically connected with a ground GND of the detection system, and a fourth pin of the isolation collector is electrically connected with one end of a resistor R4; the other end of the resistor R4 is electrically connected with a power supply VCC; and a fourth pin of the isolation collector and one end of the resistor R4 are electrically connected with the output end of the circuit. This embodiment can receive the test result of this circuit output through the IO pin at circuit output end singlechip, during the use, directly will await measuring reserve heart yearn receive by survey cable 1 port can, this circuit is convenient usable, and the assembly cost is low.
In the embodiment, the resistor R1R2 and the voltage stabilizing diode D1D2 form a detection sampling circuit, and the alternating current and direct current voltage value of a detected cable can be detected; the voltage stabilizing diode D3D4 forms an isolation circuit, so that the output circuit in a state that the high voltage of 220V and 380V of alternating current power frequency in the detection sampling circuit cannot be burnt out even if the high voltage is detected; the isolation collector U1 and the resistor R3R4 form a state output circuit; and is responsible for outputting high level or low level signals. In the embodiment, when the detected cable has no alternating current or direct current larger than 10V, the output state is high level, and when the alternating current or direct current exceeds 10V, the output state is low level.
In some embodiments of the present invention, the detection system ground is a power supply negative reference potential.
The utility model discloses a some embodiments, keep apart collector U1's response time and be less than 0.1 second, whole voltage test response speed is not more than 0.2 second.
The utility model discloses a some embodiments, zener diode D1, D2, D3 and D4's steady voltage parameter is adjustable, realizes the detection to being surveyed cable voltage signal through adjusting steady voltage parameter.
In some embodiments of the present invention, the common terminal is electrically connected to the ground PE or the cable 2 to be tested. Alternatively, the common terminal may be connected to ground to provide an isolated signal; the common end can also be connected with another cable to be measured so as to measure the voltage difference of the two cables.
The utility model discloses a part of embodiments, the detection range of a circuit that detects power frequency alternating current and direct current does: alternating current of 10V-400V and direct current of 10V-500V.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (8)
1. A circuit for detecting power frequency alternating current and direct current is characterized in that: the isolation collector comprises resistors R1, R2, R3 and R4, voltage stabilizing diodes D1, D2, D3 and D4 and an isolation collector U1;
the resistors R1 and R2 are connected in parallel, the voltage stabilizing diodes D1 and D2 are connected in series to form a diode group, and the voltage stabilizing diodes D3 and D4 are connected in parallel to form a parallel diode; the isolation collector U1 is provided with a first pin, a second pin, a third pin and a fourth pin;
the parallel input end of the R1R2 is electrically connected with the tested cable 1, the parallel output end of the R1R2 is electrically connected with the D1 end of the diode group D1D2, and the D2 end of the diode group D1D2 is electrically connected with the common end COM; the input end of the parallel diode D3D4 is electrically connected with the parallel output end of the R1R 2; the output end of the parallel diode D3D4 is electrically connected with a first pin of the isolation collector U1; a second pin of the isolation collector is electrically connected with one end of a resistor R3, the other end of the resistor R3 is electrically connected with a common end COM, a third pin of the isolation collector is electrically connected with a ground GND of the detection system, and a fourth pin of the isolation collector is electrically connected with one end of a resistor R4; the other end of the resistor R4 is electrically connected with a power supply VCC; and a fourth pin of the isolation collector and one end of the resistor R4 are electrically connected with the output end of the circuit.
2. The circuit for detecting line frequency ac and dc as claimed in claim 1, wherein: the output signal of the circuit output end comprises a high level signal and a low level signal.
3. The circuit for detecting line frequency ac and dc as claimed in claim 1, wherein: the detection system ground is a power supply negative electrode reference potential.
4. The circuit for detecting line frequency ac and dc as claimed in claim 1, wherein: the response time of the isolation collector U1 is less than 0.1 second.
5. The circuit for detecting industrial frequency alternating current and direct current of claim 1, wherein: and voltage stabilizing parameters of the voltage stabilizing diodes D1, D2, D3 and D4 are adjustable.
6. The circuit for detecting line frequency ac and dc as claimed in claim 1, wherein: the common end is electrically connected with the earth PE or the tested cable 2.
7. The circuit for detecting line frequency ac and dc as claimed in claim 1, wherein: the detection range of the circuit for detecting the power frequency alternating current and the direct current is as follows: alternating current of 10V-400V and direct current of 10V-500V.
8. A test system comprising a circuit for testing mains frequency ac and dc as claimed in any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221362958.1U CN217879406U (en) | 2022-06-01 | 2022-06-01 | Circuit and detection system for detecting power frequency alternating current and direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221362958.1U CN217879406U (en) | 2022-06-01 | 2022-06-01 | Circuit and detection system for detecting power frequency alternating current and direct current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217879406U true CN217879406U (en) | 2022-11-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221362958.1U Active CN217879406U (en) | 2022-06-01 | 2022-06-01 | Circuit and detection system for detecting power frequency alternating current and direct current |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217879406U (en) |
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2022
- 2022-06-01 CN CN202221362958.1U patent/CN217879406U/en active Active
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