CN102890184A - Optocoupler-based zero passage detecting circuit - Google Patents

Optocoupler-based zero passage detecting circuit Download PDF

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Publication number
CN102890184A
CN102890184A CN2012104137841A CN201210413784A CN102890184A CN 102890184 A CN102890184 A CN 102890184A CN 2012104137841 A CN2012104137841 A CN 2012104137841A CN 201210413784 A CN201210413784 A CN 201210413784A CN 102890184 A CN102890184 A CN 102890184A
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China
Prior art keywords
optocoupler
triode
output
zero
resistance
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Pending
Application number
CN2012104137841A
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Chinese (zh)
Inventor
张金柱
徐小东
仲健
蒋树春
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Dexun Technology Co Ltd
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Dexun Technology Co Ltd
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Publication date
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Priority to CN2012104137841A priority Critical patent/CN102890184A/en
Publication of CN102890184A publication Critical patent/CN102890184A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a zero passage detecting circuit and discloses an optocoupler-based zero passage detecting circuit consisting of input ends L and N, two current limiting resistors, a diode, an optocoupler, a triode and a plurality of resistor-capacitor units, wherein the L and N are input ends of the zero passage detecting circuit, the two current limiting resistors R1 and R2 are serially connected, one end is connected with the L, the other end is connected with the positive input end of the optocoupler U1, the other input end of the optocoupler U1 is connected with the N, the collector output end of the optocoupler U1 is connected with the base electrode of the triode Q1 and is connected with a power supply through a resistor R3, the other output end of the optocoupler U1 is connected with the emission electrode of the triode Q1 and is grounded, and the collector of the triode Q1 is connected with an external detecting port through a resistor R5. The circuit disclosed by the invention is simple in structure, low in cost, stable and reliable, convenient in use and is capable of effectively detecting the zero point of alternating current according to an edge switched by electrical level for the judgment and control of other circuits.

Description

A kind of zero cross detection circuit based on optocoupler
Technical field
The present invention relates to a kind of zero cross detection circuit, specifically a kind of zero cross detection circuit based on optocoupler.
Background technology
Zero cross detection circuit in the available circuit is of a great variety, but structure and function are complicated mostly, and only need under the application scenario of function singleness at some, often still adopt the zero cross detection circuit of this function and structure complexity to finish single zero crossing detection function, cost improves so on the one hand, on the other hand, complicated circuit instability and unreliability factors behind also can increase thereupon, and need detection and maintenace point also can increase after being out of order thereupon, reduced virtually the qualification rate of product.
Summary of the invention
Technical matters to be solved by this invention is, overcomes the shortcoming of prior art, and a kind of zero cross detection circuit based on optocoupler is provided, and is simple in structure, with low cost, reliable and stable.
The technical scheme that the present invention solves above technical matters is:
A kind of zero cross detection circuit based on optocoupler comprises AC signal input end L and N, two AC signal current-limiting resistance R1 and optocoupler U1 of R2, triode Q1 and peripheral resistance and electric capacity; AC signal input end L and N are the input end of zero cross detection circuit, and wherein AC signal input end L connects the live wire of civil power 220V, and AC signal input end N connects the zero line of civil power 220V; A termination AC signal input end L after two current-limiting resistance R1 and the R2 series connection, the positive input of another termination optocoupler U1, another input termination AC signal input end N of optocoupler U1; The collector output of optocoupler U1 connects the base stage of triode Q1, and connects power supply by a resistance R 3, the emitter of another output termination triode Q1 of optocoupler U1, and ground connection; The collector of triode Q1 connects the external detection port by a resistance R 5;
When alternating current was in positive half cycle, the light emitting diode conducting of optocoupler U1 was also luminous, causes inner phototriode conducting, and output low level, made the triode Q1 cut-off and the output high level that are attached thereto; When alternating current was in negative half period, the cut-off of the light emitting diode of optocoupler U1 caused inner phototriode cut-off, and the output high level, makes the triode Q1 conducting and the output low level that are attached thereto.The edge that outer detecting circuit can switch according to this level effectively detect zero point of alternating current, judges and controls for system.
The technical scheme that the present invention further limits is:
Aforesaid zero cross detection circuit based on optocoupler, cross-over connection has diode D1 between two input ends of optocoupler U1, and this diode plays the reverse protection effect for optocoupler U1 on the one hand, also provides backward channel for alternating current on the other hand.
Aforesaid zero cross detection circuit based on optocoupler, the collector of triode Q1 connects power supply by a resistance R 4.Resistance R 4 plays the pull-up resistor effect, can be circuit (this zero cross detection circuit) reliable and stable high level output is provided.
Aforesaid zero cross detection circuit based on optocoupler, cross-over connection has filter capacitor C1 between the external detection port that the collector of triode Q1 connects by a resistance R 5 and the ground, this electric capacity strobes, but the high frequency burr that this detection port of filtering (external detection port) is located makes output more reliable and more stable.
The invention has the beneficial effects as follows: circuit structure of the present invention is simple, and is with low cost, reliable and stable, easy to use, can effectively detect the zero point of alternating current according to the edge of level switching, for other circuit judges and control.
Description of drawings
Fig. 1 is circuit diagram of the present invention.
Embodiment
Embodiment 1
The present embodiment is a kind of zero cross detection circuit based on optocoupler, and circuit comprises AC signal input end L and N as shown in Figure 1, two AC signal current-limiting resistance R1 and optocoupler U1 of R2, triode Q1 and peripheral resistance and electric capacity; AC signal input end L and N are the input end of zero cross detection circuit, and wherein AC signal input end L connects the live wire of civil power 220V, and AC signal input end N connects the zero line of civil power 220V; A termination AC signal input end L after two current-limiting resistance R1 and the R2 series connection, the positive input of another termination optocoupler U1, another input termination AC signal input end N of optocoupler U1; The collector output of optocoupler U1 connects the base stage of triode Q1, and connects power supply by a resistance R 3, the emitter of another output termination triode Q1 of optocoupler U1, and ground connection; The collector of triode Q1 connects the external detection port by a resistance R 5; Cross-over connection has diode D1 between two input ends of optocoupler U1, and diode plays the reverse protection effect for optocoupler on the one hand, also provides backward channel for alternating current on the other hand; The collector of triode Q1 connects power supply by a resistance R 4, and resistance R 4 plays the pull-up resistor effect, can be circuit reliable and stable high level output is provided; Cross-over connection has filter capacitor C1 between the external detection port that the collector of triode Q1 connects by a resistance R 5 and the ground, and capacitor C 1 strobes, but the high frequency burr at this detection port place of filtering makes output more reliable and more stable.
When alternating current was in positive half cycle, the light emitting diode conducting of optocoupler U1 was also luminous, causes inner phototriode conducting, and output low level, made the triode Q1 cut-off and the output high level that are attached thereto; When alternating current is in negative half period, the light emitting diode cut-off of optocoupler U1, cause inner phototriode cut-off, and output high level, make the triode Q1 conducting and the output low level that are attached thereto, the edge that outer detecting circuit can switch according to this level effectively detect zero point of alternating current, judges and controls for system.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.

Claims (4)

1. zero cross detection circuit based on optocoupler is characterized in that: comprise AC signal input end L and N, two AC signal current-limiting resistance R1 and optocoupler U1 of R2, triode Q1 and peripheral resistance and electric capacity; Described AC signal input end L and N are the input end of zero cross detection circuit, and wherein AC signal input end L connects the live wire of civil power 220V, and AC signal input end N connects the zero line of civil power 220V; A termination AC signal input end L after described two current-limiting resistance R1 and the R2 series connection, the positive input of another termination optocoupler U1, another input termination AC signal input end N of described optocoupler U1; The collector output of described optocoupler U1 connects the base stage of triode Q1, and connects power supply by a resistance R 3, the emitter of another output termination triode Q1 of described optocoupler U1, and ground connection; The collector of described triode Q1 connects the external detection port by a resistance R 5;
When alternating current was in positive half cycle, the light emitting diode conducting of optocoupler U1 was also luminous, causes inner phototriode conducting, and output low level, made the triode Q1 cut-off and the output high level that are attached thereto; When alternating current was in negative half period, the cut-off of the light emitting diode of optocoupler U1 caused inner phototriode cut-off, and the output high level, makes the triode Q1 conducting and the output low level that are attached thereto.
2. the zero cross detection circuit based on optocoupler as claimed in claim 1; it is characterized in that: cross-over connection has diode D1 between two input ends of described optocoupler U1; diode D1 plays the reverse protection effect for optocoupler on the one hand, also provides backward channel for alternating current on the other hand.
3. the zero cross detection circuit based on optocoupler as claimed in claim 1, it is characterized in that: the collector of described triode Q1 connects power supply by a resistance R 4, and resistance R 4R4 plays the pull-up resistor effect, for circuit provides reliable and stable high level output.
4. the zero cross detection circuit based on optocoupler as claimed in claim 1, it is characterized in that: cross-over connection has filter capacitor C1 between the external detection port that the collector of described triode Q1 connects by a resistance R 5 and the ground, this electric capacity strobes, but the high frequency burr at this detection port place of filtering makes output more reliable and more stable.
CN2012104137841A 2012-10-25 2012-10-25 Optocoupler-based zero passage detecting circuit Pending CN102890184A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2012104137841A CN102890184A (en) 2012-10-25 2012-10-25 Optocoupler-based zero passage detecting circuit

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Application Number Priority Date Filing Date Title
CN2012104137841A CN102890184A (en) 2012-10-25 2012-10-25 Optocoupler-based zero passage detecting circuit

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104425184A (en) * 2013-08-23 2015-03-18 海尔集团公司 Control device for switching on and switching off relay and air conditioner
CN105182229A (en) * 2015-09-22 2015-12-23 郑贵林 Electric power switch action time dynamic measurement method and application, and electric power switch AC zero crossing point accurate control method and application
CN105403756A (en) * 2015-11-25 2016-03-16 佛山市顺德区澳骏电子科技有限公司 Circuit device having ground wire live detection function
CN106501663A (en) * 2016-10-19 2017-03-15 广东盈科电子有限公司 A kind of detection exchange ground wire connection whether good method
CN106841762A (en) * 2017-02-08 2017-06-13 广东美的厨房电器制造有限公司 Zero cross detection circuit and home appliance
CN110146736A (en) * 2019-06-11 2019-08-20 珠海格力电器股份有限公司 Power zero-crossing detection circuit, circuit for controlling motor, power supply zero passage detection method and driving method
CN110191310A (en) * 2019-03-27 2019-08-30 长沙理工大学 A kind of intelligent control box for video monitoring
CN110582138A (en) * 2019-05-22 2019-12-17 广州世荣电子股份有限公司 light modulator

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202025037U (en) * 2011-04-14 2011-11-02 合肥荣事达三洋电器股份有限公司 Zero crossing detecting circuit
CN102411082A (en) * 2011-07-29 2012-04-11 深圳和而泰智能控制股份有限公司 Energy-saving zero crossing detection circuit and apparatus thereof
CN102662104A (en) * 2012-04-18 2012-09-12 华为技术有限公司 Zero-crossing detection method and circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202025037U (en) * 2011-04-14 2011-11-02 合肥荣事达三洋电器股份有限公司 Zero crossing detecting circuit
CN102411082A (en) * 2011-07-29 2012-04-11 深圳和而泰智能控制股份有限公司 Energy-saving zero crossing detection circuit and apparatus thereof
CN102662104A (en) * 2012-04-18 2012-09-12 华为技术有限公司 Zero-crossing detection method and circuit

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104425184A (en) * 2013-08-23 2015-03-18 海尔集团公司 Control device for switching on and switching off relay and air conditioner
CN105182229A (en) * 2015-09-22 2015-12-23 郑贵林 Electric power switch action time dynamic measurement method and application, and electric power switch AC zero crossing point accurate control method and application
CN105182229B (en) * 2015-09-22 2018-06-29 郑贵林 The dynamic measurement of power switch actuation time and ac zero-crossing point accuracy control method and application
CN105403756A (en) * 2015-11-25 2016-03-16 佛山市顺德区澳骏电子科技有限公司 Circuit device having ground wire live detection function
CN105403756B (en) * 2015-11-25 2018-01-26 佛山市顺德区澳骏电子科技有限公司 A kind of circuit arrangement with ground wire electrification detection function
CN106501663A (en) * 2016-10-19 2017-03-15 广东盈科电子有限公司 A kind of detection exchange ground wire connection whether good method
CN106841762A (en) * 2017-02-08 2017-06-13 广东美的厨房电器制造有限公司 Zero cross detection circuit and home appliance
CN110191310A (en) * 2019-03-27 2019-08-30 长沙理工大学 A kind of intelligent control box for video monitoring
CN110582138A (en) * 2019-05-22 2019-12-17 广州世荣电子股份有限公司 light modulator
CN110146736A (en) * 2019-06-11 2019-08-20 珠海格力电器股份有限公司 Power zero-crossing detection circuit, circuit for controlling motor, power supply zero passage detection method and driving method

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