CN102830262A - Alternating current detection circuit based on bidirectional optocoupler - Google Patents
Alternating current detection circuit based on bidirectional optocoupler Download PDFInfo
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- CN102830262A CN102830262A CN2012103064896A CN201210306489A CN102830262A CN 102830262 A CN102830262 A CN 102830262A CN 2012103064896 A CN2012103064896 A CN 2012103064896A CN 201210306489 A CN201210306489 A CN 201210306489A CN 102830262 A CN102830262 A CN 102830262A
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- optocoupler
- way optocoupler
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Abstract
The invention relates to an alternating current detection circuit, in particular to an alternating current detection circuit based on a bidirectional optocoupler. According to the technical scheme, the alternating current detection circuit based on the bidirectional optocoupler comprises a transient suppression diode. The transient suppression diode is connected with a first input end of a bidirectional optocoupler primary circuit through a first resistor. A first end of a bidirectional optocoupler secondary circuit is connected with VCC (volt current condenser). A second end of the bidirectional optocoupler secondary circuit is grounded through a second resistor. Second capacitors are connected to two ends of the second resistor in parallel. By the use of the transient suppression diode, low noise interference in the circuit can be eliminated, and transient high voltage in the circuit can also be suppressed. By the use of the bidirectional optocoupler in the circuit, positive-direction alternating current signals and negative-direction alternating current signals can be detected, high voltage and low voltage are effective isolated, and subsequent circuit systems are protected.
Description
Technical field
The present invention relates to a kind of AC detection circuit, especially a kind of AC detection circuit based on two-way optocoupler belongs to the technical field of AC detection circuit.
Background technology
Along with fast development of modern industry; The AC system of in occasions such as electric power, electronics, machinery, using is more and more; Simultaneously along with the intelligent market demand and scale management to equipment; In most of the cases, need carry out state-detection, to judge whether normal or On/Off state of this system power supply to AC power in the system.At present, mainly be divided into two big types for exchanging the solution that detects: the one, alternating current is carried out step-down, rectification, voltage stabilizing and filtering, be translated into the electronic switch amount through triode again and supply the microcontroller inquiry; The 2nd, directly use corresponding alternating voltage or AC current sensor to accomplish detection to alternating voltage or electric current, it not only can detect the AC power state, but also can measure relevant numerical.Obviously, preceding a kind of method is tradition comparatively, and its circuit structure is complicated, and less stable, is not the choosing of ideal.A kind of method in back is used sensor, and circuit is simple, except that can detecting the AC signal state, also can accomplish the measurement to its related data, but its sensor price comparison is expensive, and equipment cost is higher when large-scale production.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the prior art, a kind of AC detection circuit based on two-way optocoupler is provided, it is simple in structure, and cost is low, can accomplish the accurate detection to the AC power state, and is safe and reliable.
According to technical scheme provided by the invention; Said AC detection circuit based on two-way optocoupler; Comprise Transient Suppression Diode, said Transient Suppression Diode links to each other with the first input end of two-way optocoupler primary circuit through first resistance, and first end of two-way optocoupler secondary circuit links to each other with power supply VCC; Second end of two-way optocoupler secondary circuit is through second resistance eutral grounding, and the two ends of second resistance are parallel with second electric capacity.
First end of said two-way optocoupler secondary circuit is through first capacity earth.The voltage of said power supply VCC is 5V or 3.3V.
Advantage of the present invention: use Transient Suppression Diode not only can eliminate the medium and small noise of circuit, simultaneously inhibited for the high voltage transient in the circuit; Adopted two-way optocoupler in the circuit, can detect the AC signal of positive and negative both direction, and made effectively isolation between high-low pressure have protective effect for follow-up Circuits System.
Description of drawings
Fig. 1 is a structured flowchart of the present invention.
Embodiment
Below in conjunction with concrete accompanying drawing and embodiment the present invention is described further.
As shown in Figure 1: AC detection circuit of the present invention comprises Transient Suppression Diode D1; Said Transient Suppression Diode D1 links to each other with the first input end of two-way optocoupler U1 primary circuit through first resistance R 1; First end of two-way optocoupler U1 secondary circuit links to each other with power supply VCC; Second end of two-way optocoupler U1 secondary circuit is through second resistance R, 5 ground connection, and the two ends of second resistance R 5 are parallel with second capacitor C 2.
First resistance R 1 is the current limliting protective resistance, and first capacitor C 1 is a decoupling capacitance, and second resistance R 2 is an emitter resistance, and second capacitor C 2 is a filter capacitor, two-way optocoupler
U1Second end of secondary circuit is the final output of this circuit, can be connected to the MCU input pin.Said Transient Suppression Diode D1 places and exchanges between the input and first resistance R 1, works to eliminate low pressure noise and high voltage transient suppression; AC signal through Transient Suppression Diode D1 after first resistance R 1 is connected to two-way optocoupler
U1The first input end of primary circuit, two-way optocoupler
U1The second input termination of primary circuit exchanges ground, simultaneously two-way optocoupler
U1The first termination low-pressure system power supply VCC of secondary circuit, the voltage of said power supply VCC does
+ 5VOr 3.3 V, two-way optocoupler
U1Second end of secondary circuit is through second resistance R 2 and the ground connection, and Transient Suppression Diode D1 and two-way optocoupler U1 can be converted into the high-low level that can supply low-pressure system to detect with effective AC signal input and export through second end of two-way optocoupler U1 secondary circuit; Under the situation of effectively AC signal input, the output voltage of two-way optocoupler U1 secondary circuit second end can remain in the high level scope after 2 filtering of second capacitor C, and its output can directly supply MCU (microcontroller chip) input pin to detect.First capacitor C 1 can guarantee the stability of Circuits System.In the embodiment of the invention, two-way optocoupler
U1First end of secondary circuit is corresponding with the collector terminal of light-operated triode, two-way optocoupler
U1Second end of secondary circuit is corresponding with the emitter terminal of light-operated triode.
The present invention uses Transient Suppression Diode D1 not only can eliminate the medium and small noise of circuit, and is simultaneously inhibited for the high voltage transient in the circuit; Adopted two-way optocoupler U1 in the circuit, can detect the AC signal of positive and negative both direction, and made effectively isolation between high-low pressure have protective effect for follow-up Circuits System.
Claims (3)
1. AC detection circuit based on two-way optocoupler; It is characterized in that: comprise Transient Suppression Diode (D1); Said Transient Suppression Diode (D1) links to each other with the first input end of two-way optocoupler (U1) primary circuit through first resistance (R1); First end of two-way optocoupler (U1) secondary circuit links to each other with power supply VCC, and second end of two-way optocoupler (U1) secondary circuit is through second resistance (R5) ground connection, and the two ends of second resistance (R5) are parallel with second electric capacity (C2).
2. the AC detection circuit based on two-way optocoupler according to claim 1 is characterized in that: first end of said two-way optocoupler (U1) secondary circuit is through first electric capacity (C1) ground connection.
3. the AC detection circuit based on two-way optocoupler according to claim 1 is characterized in that: the voltage of said power supply VCC is 5V or 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306489.6A CN102830262B (en) | 2012-08-27 | 2012-08-27 | Alternating current detection circuit based on bidirectional optocoupler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210306489.6A CN102830262B (en) | 2012-08-27 | 2012-08-27 | Alternating current detection circuit based on bidirectional optocoupler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102830262A true CN102830262A (en) | 2012-12-19 |
| CN102830262B CN102830262B (en) | 2015-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210306489.6A Active CN102830262B (en) | 2012-08-27 | 2012-08-27 | Alternating current detection circuit based on bidirectional optocoupler |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015184832A1 (en) * | 2014-10-09 | 2015-12-10 | 中兴通讯股份有限公司 | Alternating current detection circuit |
| CN106324326A (en) * | 2016-11-01 | 2017-01-11 | 广东京安交通科技有限公司 | Alternating voltage detection circuit and device |
| US9590412B2 (en) | 2015-01-02 | 2017-03-07 | Honeywell International Inc. | System for improving lightning immunity for a solid state power controller |
| CN109541287A (en) * | 2018-12-29 | 2019-03-29 | 天津康途科技有限公司 | A kind of leak current detection device |
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| DE3716140A1 (en) * | 1987-05-14 | 1988-11-24 | Rutenbeck Wilhelm Gmbh & Co | Power connection relay (PCR) for telephone networks operated according to the ISDN system |
| GB2339295A (en) * | 1998-02-12 | 2000-01-19 | Furukawa Electric Co Ltd | Instrument for measuring alternating current |
| CN101183144A (en) * | 2007-12-05 | 2008-05-21 | 海信集团有限公司 | Single-phase power-supply wiring judgement method and single-phase power supply phase testing circuit |
| CN102148488A (en) * | 2010-02-09 | 2011-08-10 | 松下电器产业株式会社 | Circuit device |
| CN202126462U (en) * | 2011-01-06 | 2012-01-25 | 上海雷迅防雷技术有限公司 | Passive thunder collecting connector |
| CN202285347U (en) * | 2011-10-25 | 2012-06-27 | 常熟开关制造有限公司(原常熟开关厂） | State detection circuit for main/standby execution switch of automatic change-over switch |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| DE3716140A1 (en) * | 1987-05-14 | 1988-11-24 | Rutenbeck Wilhelm Gmbh & Co | Power connection relay (PCR) for telephone networks operated according to the ISDN system |
| GB2339295A (en) * | 1998-02-12 | 2000-01-19 | Furukawa Electric Co Ltd | Instrument for measuring alternating current |
| CN101183144A (en) * | 2007-12-05 | 2008-05-21 | 海信集团有限公司 | Single-phase power-supply wiring judgement method and single-phase power supply phase testing circuit |
| CN102148488A (en) * | 2010-02-09 | 2011-08-10 | 松下电器产业株式会社 | Circuit device |
| CN202126462U (en) * | 2011-01-06 | 2012-01-25 | 上海雷迅防雷技术有限公司 | Passive thunder collecting connector |
| CN202285347U (en) * | 2011-10-25 | 2012-06-27 | 常熟开关制造有限公司(原常熟开关厂） | State detection circuit for main/standby execution switch of automatic change-over switch |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015184832A1 (en) * | 2014-10-09 | 2015-12-10 | 中兴通讯股份有限公司 | Alternating current detection circuit |
| CN105572523A (en) * | 2014-10-09 | 2016-05-11 | 中兴通讯股份有限公司 | AC detection circuit |
| US9590412B2 (en) | 2015-01-02 | 2017-03-07 | Honeywell International Inc. | System for improving lightning immunity for a solid state power controller |
| CN106324326A (en) * | 2016-11-01 | 2017-01-11 | 广东京安交通科技有限公司 | Alternating voltage detection circuit and device |
| CN109541287A (en) * | 2018-12-29 | 2019-03-29 | 天津康途科技有限公司 | A kind of leak current detection device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102830262B (en) | 2015-04-22 |
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Address after: The new plum village in Jiangsu province 214112 city Wuxi Qunxing Road No. 26 Patentee after: Wuxi Ampang electric Limited by Share Ltd Address before: The new plum village in Jiangsu province 214112 city Wuxi Qunxing Road No. 26 Patentee before: Anbang Electric Co., Ltd., Wuxi |