CN210604753U - Detection circuit for detecting whether alternating current exists or not and device applying same - Google Patents
Detection circuit for detecting whether alternating current exists or not and device applying same Download PDFInfo
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- CN210604753U CN210604753U CN201920809650.9U CN201920809650U CN210604753U CN 210604753 U CN210604753 U CN 210604753U CN 201920809650 U CN201920809650 U CN 201920809650U CN 210604753 U CN210604753 U CN 210604753U
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- 238000001514 detection method Methods 0.000 title claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 230000000694 effects Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The utility model discloses a detection circuit for the existence of alternating current, wherein one end of a first pin 1 of a rectifier diode D1, a second pin 2 of a D2 and one end of a resistor R1 are connected with a live wire L of a mains supply; the other end of the resistor R1 is connected with a first pin 1 of an alternating current optocoupler U1; a second pin 2 of the alternating current optocoupler is connected with a first pin 1 of a rectifying diode D3, a second pin 2 of a D1 and L of a LOAD; the first pin 1 of the rectifier diode D2 is connected with the second pin 2 of the D3; the LOAD zero line N is connected with the commercial power N; the third pin 3 of the alternating current optocoupler U1 is connected with the ground, and an electrolytic capacitor C1 is connected in parallel with the fourth pin 4; a fourth pin 4 of the alternating current optocoupler U1 is connected with one end of a resistor R2, and the other end of the resistor R2 is connected with an anode VCC; and the fourth pin 4 of the alternating current optical coupler U1 is used as IO output again. The device is characterized in that at least one detection circuit for detecting the existence of the alternating current is arranged on a corresponding PCB.
Description
Technical Field
The utility model relates to a circuit field relates to a detection circuitry that alternating current has or not and applied device of this circuit especially.
Background
With the development of modern road traffic, more and more traffic lights are required for various intersections, in order to ensure the safety of vehicles and pedestrians passing through the intersections and avoid passing conflicts, the requirements for detecting the alternating currents of all the traffic lights at the intersections are carried out, the detected current data and voltage data are combined and compared with a conflict table logically, a passing conflict protection mechanism can be formed, the conflict of the vehicles and the pedestrians passing through the intersections can be effectively avoided, and the safety of the pedestrians and the vehicles passing through the intersections is protected.
There are various circuits for detecting the presence or absence of alternating current, and the main ones used at present are:
1) detecting through a circuit mainly comprising an alternating current transformer;
2) the detection is performed by a circuit mainly including a sampling resistor and an AD conversion circuit.
A crossing usually has tens of traffic lights, and the above-mentioned circuit has insurmountable drawbacks when faced with the need to detect the alternating current of tens or even hundreds of traffic lights:
1) tens of alternating-current voltage transformers have high cost and large volume and occupy a lot of circuit board space;
2) the tens of AD conversion circuits have many devices, complex circuit design, large occupied space of the circuit board, no contribution to stable work of the circuit board and high cost.
SUMMERY OF THE UTILITY MODEL
In order to overcome the deficiency of the prior art, the embodiment of the utility model provides a detection circuitry and applied this circuit's device that alternating current that reduce cost, reduction device, simplified circuit had or not.
The embodiment of the utility model provides a solve the technical scheme that its technical problem adopted and be:
the circuit includes: a first pin 1 of the rectifying diode D1, a second pin 2 of the rectifying diode D2 and one end of the resistor R1 are connected with a live line L of the mains supply; the other end of the resistor R1 is connected with a first pin 1 of an alternating current optocoupler U1; a second pin 2 of the alternating current optocoupler is connected with a first pin 1 of a rectifying diode D3, and a second pin 2 of the D1 is connected with a live wire L end of a LOAD LOAD; the first pin 1 of the D2 is connected with the second pin 2 of the D3; the zero line N of the LOAD LOAD is connected with the N of the commercial power; the third pin 3 of the alternating current optocoupler U1 is grounded, and an electrolytic capacitor C1 is connected in parallel with the fourth pin 4; a fourth pin 4 of the alternating current optocoupler U1 is connected with the anode VCC through a resistor R2; and a fourth pin 4 of the alternating current optical coupler U1 is used as IO output.
Preferably, the parameters of the diodes D1, D2 and D3 are 1A/1000v, 2A/1000v and 3A/1000v respectively, so that the normal operation of the circuit is ensured.
Preferably, the ac optical coupler U1 is one of a PC814 chip, a TLP626 chip or a TLP320 chip, and the three chips have a small volume, a long service life, no contact and a strong interference rejection.
Preferably, the parameter of the electrolytic capacitor C1 is 47 muf/25 v or 47 muf/50 v, so that a better protection circuit is provided.
Preferably, the current limiting resistor R1 is one of 39 Ω/0.125W or 68 Ω/0.125W, and the pull-up resistor R2 is one of 4.7K/0.125W or 10K/0.125W.
According to the embodiment of the utility model discloses on the other hand, still provide a detection device that alternating current has or not, the device installs the detection circuitry that at least one foretell alternating current has or not on corresponding PCB board.
The utility model discloses beneficial effect of embodiment:
according to the scheme, when the current flows from D3 to D2, D2 and D3 are not conducted, D1 is conducted, but the voltage drop value is insufficient, U1 cannot be conducted, when the current flows from D2 to D3, D1 is turned off, D2 and D3 are conducted, voltage drops are generated on the second pin 2 of D2 and the first pin 1 of D3, and the voltage difference value is divided by the resistor R1 to be the current value for conducting the AC optocoupler U1. The detection of the existence of the alternating current can be obtained by selecting D1, D2, D3, R1 and U1 with proper parameters. The pull-up resistor R2 and the electrolytic capacitor C1 for filtering are used for obtaining stable high-low level output of the alternating current optocoupler U1. The scheme has the advantages of few components, simple structure, low cost and convenient use.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a circuit structure diagram of the present invention.
Detailed Description
Referring to fig. 1, in the detection circuit for detecting the presence or absence of ac current, a first pin 1 of a rectifier diode D1, a second pin 2 of a D2, and one end of a resistor R1 are connected to a live line L of a mains supply; the other end of the resistor R1 is connected with a first pin 1 of an alternating current optocoupler U1; a second pin 2 of the alternating current optocoupler is connected with a first pin 1 of a rectifying diode D3, and a second pin 2 of a D1 is connected with L of a LOAD LOAD; the first pin 1 of the rectifier diode D2 is connected with the second pin 2 of the D3; the LOAD zero line N is connected with the commercial power N; the third pin 3 of the alternating current optocoupler U1 is connected with the ground, and an electrolytic capacitor C1 is connected in parallel with the fourth pin 4; a fourth pin 4 of the alternating current optocoupler U1 is connected with a voltage VCC through a resistor R2; and a fourth pin 4 of the alternating current optical coupler U1 is used as an IO output.
When current flows from D3 to D2, D2 and D3 are not conducted, D1 is conducted, but the voltage drop value is insufficient, U1 cannot be conducted, when current flows from D2 to D3, D1 is turned off, D2 and D3 are conducted, voltage drop is generated on the second pin 2 of D2 and the first pin 1 of D3, and the voltage difference value is divided by the resistor R1 to be the current value of the conducting alternating current optocoupler U1. The detection of the existence of the alternating current can be obtained by selecting D1, D2, D3, R1 and U1 with proper parameters. The pull-up resistor R2 and the electrolytic capacitor C1 for filtering are used for obtaining stable high-low level output of the alternating current optocoupler U1. The scheme has the advantages of few components, simple structure, low cost and convenient use.
The parameters of the diodes D1, D2 and D3 are 1A/1000v, 2A/1000v and 3A/1000v respectively, so that the normal operation of the circuit is ensured.
The alternating current optocoupler U1 is one of a PC814 chip, a TLP626 chip or a TLP320 chip, and the three chips are small in size, long in service life, contactless and strong in anti-interference capability.
Preferably, the parameter of the electrolytic capacitor C1 is 47 muf/25 v or 47 muf/50 v, so that a better protection circuit is provided.
Preferably, the current limiting resistor R1 has one of 39 omega/0.125W or 68 omega/0.125W, and the pull-up resistor R2 has one of 4.7K/0.125W or 10K/0.125W.
Further, the embodiment of the utility model provides a detection device that alternating current has or not still provides, the device installs the detection circuitry that at least one foretell alternating current has or not on corresponding PCB board.
The above is only the preferred embodiment of the present invention, but the present invention is not limited to the above embodiments, and the technical effects of the present invention should fall into the protection scope of the present invention as long as it is reached by any of the same or similar means.
Claims (6)
1. A circuit for detecting the presence or absence of an alternating current, comprising: a first pin 1 of the rectifying diode D1, a second pin 2 of the rectifying diode D2 and one end of the resistor R1 are connected with a live line L of the mains supply; the other end of the resistor R1 is connected with a first pin 1 of an alternating current optocoupler U1; a second pin 2 of the alternating current optocoupler is connected with a first pin 1 of a rectifying diode D3, and a second pin 2 of the D1 is connected with a live wire L end of a LOAD LOAD; the first pin 1 of the D2 is connected with the second pin 2 of the D3; the zero line N of the LOAD LOAD is connected with the end N of the zero line of the commercial power; the third pin 3 of the alternating current optocoupler U1 is grounded, and an electrolytic capacitor C1 is connected in parallel with the fourth pin 4; a fourth pin 4 of the alternating current optocoupler U1 is connected with a voltage VCC through a resistor R2; and a fourth pin 4 of the alternating current optical coupler U1 is used as IO output.
2. The circuit for detecting the presence or absence of an alternating current according to claim 1, wherein: the parameters of the diodes D1, D2 and D3 are 1A/1000v, 2A/1000v and 3A/1000v respectively.
3. The circuit for detecting the presence or absence of an alternating current according to claim 1, wherein: the ac optical coupler U1 is one of a PC814 chip, a TLP626 chip or a TLP320 chip.
4. The circuit for detecting the presence or absence of an alternating current according to claim 1, wherein: the parameter of the electrolytic capacitor C1 is 47 muf/25 v or 47 muf/50 v.
5. The circuit for detecting the presence or absence of an alternating current according to claim 1, wherein: the parameter of the current limiting resistor R1 is one of 39 omega/0.125W or 68 omega/0.125W, and the parameter of the pull-up resistor R2 is one of 4.7K/0.125W or 10K/0.125W.
6. A detection device for detecting the presence or absence of an alternating current, characterized in that: the device is provided with at least one detection circuit for detecting the presence or absence of alternating current according to any one of claims 1 to 5 on a corresponding PCB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920809650.9U CN210604753U (en) | 2019-05-30 | 2019-05-30 | Detection circuit for detecting whether alternating current exists or not and device applying same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920809650.9U CN210604753U (en) | 2019-05-30 | 2019-05-30 | Detection circuit for detecting whether alternating current exists or not and device applying same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210604753U true CN210604753U (en) | 2020-05-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920809650.9U Expired - Fee Related CN210604753U (en) | 2019-05-30 | 2019-05-30 | Detection circuit for detecting whether alternating current exists or not and device applying same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210604753U (en) |
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2019
- 2019-05-30 CN CN201920809650.9U patent/CN210604753U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200522 |