CN201868333U - Relay control circuit with current detection function - Google Patents
Relay control circuit with current detection function Download PDFInfo
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- CN201868333U CN201868333U CN201020620270XU CN201020620270U CN201868333U CN 201868333 U CN201868333 U CN 201868333U CN 201020620270X U CN201020620270X U CN 201020620270XU CN 201020620270 U CN201020620270 U CN 201020620270U CN 201868333 U CN201868333 U CN 201868333U
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- 238000001514 detection method Methods 0.000 title claims abstract description 19
- 238000005070 sampling Methods 0.000 claims abstract description 24
- 238000002955 isolation Methods 0.000 claims abstract description 13
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000005611 electricity Effects 0.000 claims description 6
- 230000005622 photoelectricity Effects 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract 1
- 240000007320 Pinus strobus Species 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 238000004353 relayed correlation spectroscopy Methods 0.000 description 1
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Abstract
The utility model relates to a relay control circuit with a current detection function, which consists of a current control circuit, a current sampling circuit and a current signal isolation detection circuit, wherein the current control circuit is used for realizing the on/off control of high-voltage current through low-voltage current, the current sampling circuit is connected into a high-voltage circuit in series and is used for realizing current sampling through a diode, and the current signal isolation detection circuit is used for realizing the photoelectric isolation output of current output by the current sampling circuit through an optical coupler U1. The utility model mainly solves the problems that the relay control circuit does not have a current feedback function and different-voltage alternating-current and direct-current detection circuits cannot be universally used. On the same pair of terminals, the design circuit not only can be used as an output circuit for controlling other equipment but also can be used for detecting whether current exists in the circuit of the controlled equipment or not. Moreover, the power supply of the controlled equipment not only can be a direct-current power supply but also can be an alternating-current power supply, and the relay control circuit with the current detection function is suitable for 24V to 220V voltage.
Description
Technical field
The utility model relates to a kind of control relay circuit with current sense function, and it is integrated mainly to utilize diode and optocoupler to realize that on same pair of wire connection terminals output and input detect, and belongs to electric field.
Background technology
In the control of Industry Control repeat circuit is a kind of control circuit commonly used, and it can control big electric current, high voltage by small-signal.Common control relay circuit can only be exported control signal, and controlled circuit is not detected, and can not feed back the state of controlled device.And the existing interchange of voltage of the object of industrial circle relay control also has direct current, and voltage swing is also different, and (24V ~ 220V), usual current detection circuit can not be general.
Summary of the invention
The purpose of this utility model provides a kind of control relay circuit with current sense function.
The utility model mainly solves control relay circuit does not have the problem of current feedback and the problem that the testing circuit under the different voltage condition of AC/DC can not be general.
The technical solution of the utility model is: a kind of control relay circuit with current sense function, constitute by current control circuit, current sampling circuit, current signal isolation detection circuit, current control circuit is connected with current sampling circuit, constitute high-tension electricity control loop, current sampling circuit is connected in the high-tension electricity circuit, the diode output sampling current signal in the current sampling circuit; The current signal isolation detection circuit carries out photoelectricity by optocoupler U1 to the current signal of exporting in the current sampling circuit and isolates output.
Current control circuit mainly by relay as control element, at relay output pin series current sample circuit; Current sampling circuit is made of 4 diode D2 ~ D5 and resistance R 2, reverse parallel connection after wherein 4 diode D2 ~ D5 connect in twos; Resistance R 2 and two groups of diodes are in parallel; The current signal isolation detection circuit is made of optocoupler U1, resistance R 1 and filter circuit, the input of optocoupler U1 is in series with resistance R 1, the signal output part of optocoupler U1 is parallel with filter circuit, and resistance R 1 is the current-limiting resistance of optocoupler U1, and resistance R 2 provides bypass for little electric current; Filter circuit is made of capacitor C 1 and resistance R 3, capacitor C 1 and resistance R 3 ground connection in parallel, and capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1; Optocoupler U1 is two-way optocoupler.
Using method is: power supply and power consumption equipment in J1 and the series connection of J2 end, and the break-make of relay K 1 control circuit, the diode D1 that is connected in parallel on relay K 1 coil two ends is used to absorb the self inductance current that relay K 1 coil produces.4 diode D2 ~ D5 have been connected at relay K 1 output pin, in twos series connection back reverse parallel connection.When the closing of contact of relay K 1, its two ends just have voltage (0.7V*2=1.4V) when having electric current to flow through diode, and this voltage can drive optocoupler U1, and the signal of exporting from optocoupler can be received by microcontroller.Because diode drop is constant, so this circuit goes for the detection of different voltage.Be provided with the diode of two groups of reverse parallel connections, and optocoupler U1 is two-way optocoupler,, can detects alternating current again so this circuit both can detect the direct current of any direction.Resistance R 1 is the current-limiting resistance of optocoupler.Resistance R 2 provides bypass for little electric current.Capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1.
Description of drawings
Accompanying drawing 1 is a kind of layout plan with control relay circuit of current sense function;
Among the figure: 1, current control circuit 2, current sampling circuit 3, current signal isolation detection circuit.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described.
As shown in Figure 1, a kind of control relay circuit with current sense function, constitute by current control circuit 1, current sampling circuit 2, current signal isolation detection circuit 3, current control circuit 1 is used to finish the break-make control of low tension to high-tension electricity, current sampling circuit 2 is connected in the high-tension electricity circuit, finish the current signal sampling by diode, current signal isolation detection circuit 3 carries out photoelectricity by optocoupler U1 to the current signal of exporting in the current sampling circuit 2 and isolates output
Using method is: be example with the marine searchlight, 220v power supply and searchlight in J1 and the series connection of J2 end, relay K 1 is held input voltage by the engine-room control console button at RELAY, the break-make of control circuit, the diode D1 that is connected in parallel on relay K 1 coil two ends is used to absorb the self inductance current that relay coil produces.Output pin in relay K 1 connects 4 diode D2 ~ D5, in twos series connection back reverse parallel connection.The closing of contact when relay K 1, its two ends just have voltage (0.7V*2=1.4V) when having electric current to flow through diode, this voltage can drive optocoupler U1, VCC end be loaded as 5v or the 3v power supply identical with the power supply of the interior single-chip microcomputer of engine-room control console, can be received by the singlechip controller in the engine-room control console from the high level signal of optocoupler signal output part CURRENT output, light corresponding indicator light on the control desk, if when the searchlight that uses has been broken, the loop disconnects, the signal of optocoupler signal output part CURRENT output is a low level just, and the lamp went out or control desk sends the indication of reporting to the police in corresponding indication.Because diode drop is constant, so this circuit goes for the detection of different voltage.Be provided with the diode of two groups of reverse parallel connections, and optocoupler U1 is two-way optocoupler,, can detects alternating current again so this circuit both can detect the direct current of any direction.Resistance R 1 is the current-limiting resistance of optocoupler.Resistance R 2 provides bypass for little electric current.Capacitor C 1 strobes when detecting AC signal, and resistance R 3 provides discharge channel for capacitor C 1.
Claims (6)
1. control relay circuit with current sense function, by current control circuit (1), current sampling circuit (2), current signal isolation detection circuit (3) constitutes, it is characterized in that: current control circuit (1) is connected with current sampling circuit (2), constitute high-tension electricity control loop, current sampling circuit (2) is connected in the high-tension electricity circuit, diode output sampling current signal in the current sampling circuit (2), current signal isolation detection circuit (3) carries out photoelectricity by optocoupler U1 to the current signal of exporting in the current sampling circuit (2) and isolates output.
2. a kind of control relay circuit with current sense function according to claim 1 is characterized in that: described current control circuit (1) mainly by relay K 1 as control element, at the output pin series current sample circuit (2) of relay K 1.
3. a kind of control relay circuit with current sense function according to claim 1 is characterized in that: described current sampling circuit (2) is made of 4 diode D2 ~ D5 and resistance R 2, reverse parallel connection after wherein 4 diode D2 ~ D5 connect in twos; Resistance R 2 and two groups of diodes are in parallel.
4. a kind of control relay circuit according to claim 1 with current sense function, it is characterized in that: described current signal isolation detection circuit (3) is made of optocoupler U1, resistance R 1 and filter circuit, the input of optocoupler U1 is in series with resistance R 1, and the signal output part of optocoupler U1 is parallel with filter circuit.
5. a kind of control relay circuit with current sense function according to claim 4 is characterized in that: described filter circuit is made of capacitor C 1 and resistance R 3, capacitor C 1 and resistance R 3 ground connection in parallel.
6. a kind of control relay circuit with current sense function according to claim 4 is characterized in that: described optocoupler U1 is two-way optocoupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020620270XU CN201868333U (en) | 2010-11-24 | 2010-11-24 | Relay control circuit with current detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020620270XU CN201868333U (en) | 2010-11-24 | 2010-11-24 | Relay control circuit with current detection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201868333U true CN201868333U (en) | 2011-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201020620270XU Expired - Fee Related CN201868333U (en) | 2010-11-24 | 2010-11-24 | Relay control circuit with current detection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201868333U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082042A (en) * | 2010-11-24 | 2011-06-01 | 浙江海洋学院 | Relay control circuit with current detecting function |
| CN106291045A (en) * | 2015-05-22 | 2017-01-04 | 登腾电子股份有限公司 | Current sensing module, power conversion device and electronic device applying same |
| CN106940396A (en) * | 2017-05-04 | 2017-07-11 | 贵州电网有限责任公司 | A kind of Fiber-Optic Voltage |
| CN106970254A (en) * | 2017-05-04 | 2017-07-21 | 贵州电网有限责任公司 | A kind of optical fiber current mutual inductor |
-
2010
- 2010-11-24 CN CN201020620270XU patent/CN201868333U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102082042A (en) * | 2010-11-24 | 2011-06-01 | 浙江海洋学院 | Relay control circuit with current detecting function |
| CN106291045A (en) * | 2015-05-22 | 2017-01-04 | 登腾电子股份有限公司 | Current sensing module, power conversion device and electronic device applying same |
| CN106291045B (en) * | 2015-05-22 | 2019-02-19 | 登腾电子股份有限公司 | Current sensing module, power conversion device and electronic device applying same |
| CN106940396A (en) * | 2017-05-04 | 2017-07-11 | 贵州电网有限责任公司 | A kind of Fiber-Optic Voltage |
| CN106970254A (en) * | 2017-05-04 | 2017-07-21 | 贵州电网有限责任公司 | A kind of optical fiber current mutual inductor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110615 Termination date: 20111124 |