CN102890184A - Zero-crossing detection circuit based on optocoupler - Google Patents
Zero-crossing detection circuit based on optocoupler Download PDFInfo
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Abstract
The invention relates to a zero-crossing detection circuit based on an optocoupler, which consists of input ends L and N, two current-limiting resistors, a diode, an optocoupler, a triode and a plurality of resistance-capacitance elements, wherein the L and the N are input ends of the zero-crossing detection circuit, the two current-limiting resistors R1 and R2 are connected in series, one end of the L and the other end of the L are connected with a positive input end of an optocoupler U1, the other input end of an optocoupler U1 is connected with the N, the collector output end of the optocoupler U1 is connected with the base of a 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 emitter of a triode Q1 and is grounded, and the collector of the triode Q1 is connected with an. The circuit of the invention has simple structure, low cost, stability and reliability and convenient use, and can effectively detect the zero point of the alternating current according to the edge of the level switching for other circuits to judge and control.
Description
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.
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| CN2012104137841A CN102890184A (en) | 2012-10-25 | 2012-10-25 | Zero-crossing detection circuit based on optocoupler |
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| CN2012104137841A CN102890184A (en) | 2012-10-25 | 2012-10-25 | Zero-crossing detection circuit based on optocoupler |
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Cited By (12)
| 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 supply zero-crossing detection circuit, motor control circuit, power supply zero-crossing detection method and motor driving method |
| CN110146807A (en) * | 2019-06-05 | 2019-08-20 | 厦门立林电气控制技术有限公司 | A kind of trip coil monitoring circuit and monitoring 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 |
| CN114113759A (en) * | 2021-12-22 | 2022-03-01 | 杭州联芯通半导体有限公司 | Zero-crossing detection circuit |
| CN114252689A (en) * | 2021-12-08 | 2022-03-29 | 杭州联芯通半导体有限公司 | Zero-crossing detection circuit |
| EP4266563A1 (en) * | 2022-04-22 | 2023-10-25 | Nexperia B.V. | Energy harvesting system |
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| 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 |
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2012
- 2012-10-25 CN CN2012104137841A patent/CN102890184A/en active Pending
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| 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 |
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Cited By (16)
| 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 |
| CN110146807A (en) * | 2019-06-05 | 2019-08-20 | 厦门立林电气控制技术有限公司 | A kind of trip coil monitoring circuit and monitoring method |
| CN110146736A (en) * | 2019-06-11 | 2019-08-20 | 珠海格力电器股份有限公司 | Power supply zero-crossing detection circuit, motor control circuit, power supply zero-crossing detection method and motor driving method |
| CN114252689A (en) * | 2021-12-08 | 2022-03-29 | 杭州联芯通半导体有限公司 | Zero-crossing detection circuit |
| CN114113759A (en) * | 2021-12-22 | 2022-03-01 | 杭州联芯通半导体有限公司 | Zero-crossing detection circuit |
| US11835553B2 (en) | 2021-12-22 | 2023-12-05 | Hangzhou Lianxintong Semiconductor Co., Ltd. | Zero-crossing detection circuit |
| EP4266563A1 (en) * | 2022-04-22 | 2023-10-25 | Nexperia B.V. | Energy harvesting system |
| NL2031659B1 (en) * | 2022-04-22 | 2023-11-07 | Nowi Energy B V | Energy harvesting system |
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Application publication date: 20130123 |