CN203191441U - Alternating current zero-cross detection circuit - Google Patents
Alternating current zero-cross detection circuit Download PDFInfo
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- CN203191441U CN203191441U CN 201320230754 CN201320230754U CN203191441U CN 203191441 U CN203191441 U CN 203191441U CN 201320230754 CN201320230754 CN 201320230754 CN 201320230754 U CN201320230754 U CN 201320230754U CN 203191441 U CN203191441 U CN 203191441U
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- alternating current
- capacitor
- zero
- detection circuit
- optocoupler
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Abstract
The utility model discloses an alternating current zero-crossing detection circuit consisting of a power supply charging circuit and a zero-crossing detection circuit, wherein the charging circuit provides a power supply. The zero-crossing detection circuit detects a zero-crossing point of an alternating current, and emits an alternating current zero-crossing signal pulse. Current limiting of a resistor and unipolar conductivity of a diode are used by the charging circuit to charge a capacitor when the alternating current is in a positive half cycle and the diode conducts in a forward direction; when the alternating current is in a negative half cycle, the diode is cut off and voltage on the capacitor remains essentially unchanged; and when the alternating current crosses zero and the positive half cycle just begins, the zero-crossing detection circuit conducts an optocoupler and emits an alternating current zero-crossing pulse signal. An optocoupler-driving circuit is connected in series with a capacitor. When the optocoupler is conducted, the capacitor is being charged; and when the capacitor is fully charged and no current flows through the optocoupler, an optocoupler output is cut off automatically. According to the alternating current zero-crossing detection circuit, few components are used and power consumption is low, so reliability is high and energy is saved.
Description
Technical field
The utility model relates to alternating current zero passage detection technical field, especially relates to a kind of alternating current zero cross detection circuit.
Background technology
The alternating current zero cross detection circuit can be realized the detection with the alternating current phases related data, is extensive use of at aspects such as power transmission and transformation control and power line carrier communications.Yet problems such as existing common alternating current zero cross detection circuit exists that precision is poor, circuit complexity, power consumption are big, poor reliability are not very good in actual applications.
The utility model content
The purpose of this utility model is exactly to have overcome the problem that existing alternating current zero cross detection circuit exists, and a kind of precision height, circuit is simple, thermal value is little, reliability is high alternating current zero cross detection circuit are provided.
The utility model has adopted technical scheme: a kind of alternating current zero cross detection circuit comprises power charging circuit and zero cross detection circuit; Described power charging circuit is series resistor, diode D1 and capacitor C 1 successively at the two ends of alternating current, and at diode D1 and capacitor C 1 a two ends stabilivolt TS1 arranged side by side; Described zero cross detection circuit comprises optocoupler U1, capacitor C 2, triode Q1 and resistance R 3, resistance R 4, resistance R 5, resistance R 6, the negative pole end of diode D1 is connected in series the collector of optocoupler U1, capacitor C 2, resistance R 6 and triode Q1 successively, the emitter of triode Q1 is connected with an end of alternating current, transistor base is connected with the positive terminal of diode D1 by resistance R 3, optocoupler U1 two ends parallel resistance R4, capacitor C 2 two ends resistance R 5 arranged side by side.
Power charging circuit provides power supply, and zero cross detection circuit detects the zero crossing of alternating current, and sends the pulse of alternating current zero cross signal.The power source charges loop: utilize the unilateral conduction of resistance current limliting and diode, diode forward conducting when alternating current is in positive half cycle is charged to electric capacity; When alternating current was in negative half period, diode ended, and the voltage on the electric capacity remains unchanged substantially.Zero cross detection circuit; In the alternating current zero passage, positive half cycle incipient moment, the conducting optocoupler sends alternating current zero-crossing pulse signal.The circuit that drives optocoupler is serially connected with electric capacity, electric capacity charging during the optocoupler conducting, and after electric capacity was full of electricity, the optocoupler no current flow through, and the output of optocoupler becomes cut-off state automatically.
The beneficial effects of the utility model: the utility model utilizes the positive half cycle of alternating current that electric capacity is charged, for optocoupler provides power supply; In the moment optocoupler conducting that the positive half cycle of alternating current has just arrived, send pulse signal, expression alternating current zero passage this moment.The used element of this circuit is few, and is low in energy consumption, so reliability height when using has also been saved the energy.This circuit is tried out in the low-voltage powerline carrier communication system of state's net electric energy meter, produces a desired effect.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment:
Below in conjunction with accompanying drawing the utility model is described further.
In Fig. 1, form charging circuit by resistance R 1, R2, stabilivolt TS1, diode D1, capacitor C 1.L and N receive the two ends of AC power, and when alternating current was in positive half cycle, electric current was through capacitor C 1 charging of resistance R 1, R2, diode D1, and by stabilivolt TS1 restriction charging voltage.When alternating current was in negative half period, alternating current was through stabilivolt TS1, and resistance R 2, R1 flow through, because the unilateral conduction of diode D1 is arranged, this moment, D1 ended, so the voltage on the capacitor C 1 remains unchanged substantially.
In Fig. 1, form zero cross detection circuit by resistance R 1, R2, R3, R4, R5, R6, triode Q1, capacitor C 2, optocoupler U1.When alternating current zero passage, positive half cycle incipient moment, alternating current flows through through resistance R 1, R2, R3, Q1, and triode Q1 conducting is so the electric energy on the capacitor C 1 flows through through light-emitting diodes pipe end, capacitor C 2, resistance R 6, the triode Q1 of U1, the alternating current zero cross signal is sent in optocoupler U1 conducting.This moment, electric current can not continue to flow through optocoupler U1 again, so optocoupler U1 has ended after sending pulse soon because capacitor C 2 is full of electricity soon.Because Q1 is in conducting state when the positive half cycle of alternating current always, after capacitor C 2 is full of electricity, electric energy on the capacitor C 1 just flows through through resistance R 4, R5, R6, triode Q1, but this electric current is little more a lot of than the electric current of past capacitor C 1 charging, and so just can guarantee has suitable voltage always on the capacitor C 1.Here resistance R 6 plays the restriction size of current.Next interim when the alternating current negative half period, alternating current flows through through stabilivolt TS1, resistance R 2, R1, and triode Q1 is in cut-off state, and the electric energy on the capacitor C 2 discharges through resistance R 5 at this moment, charges again for optocoupler U1 conducting next time, capacitor C 2 and gets ready.
Resistance R 1, R2 can select 1 or many resistance for use according to resistance type selecting and power match.
Claims (1)
1. an alternating current zero cross detection circuit comprises power charging circuit and zero cross detection circuit; Described power charging circuit is series resistor, diode D1 and capacitor C 1 successively at the two ends of alternating current, and at diode D1 and capacitor C 1 a two ends stabilivolt TS1 arranged side by side; Described zero cross detection circuit comprises optocoupler U1, capacitor C 2, triode Q1 and resistance R 3, resistance R 4, resistance R 5, resistance R 6, the negative pole end of diode D1 is connected in series the collector of optocoupler U1, capacitor C 2, resistance R 6 and triode Q1 successively, the emitter of triode Q1 is connected with an end of alternating current, transistor base is connected with the positive terminal of diode D1 by resistance R 3, optocoupler U1 two ends parallel resistance R4, capacitor C 2 two ends resistance R 5 arranged side by side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320230754 CN203191441U (en) | 2013-04-18 | 2013-04-18 | Alternating current zero-cross detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320230754 CN203191441U (en) | 2013-04-18 | 2013-04-18 | Alternating current zero-cross detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203191441U true CN203191441U (en) | 2013-09-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320230754 Expired - Fee Related CN203191441U (en) | 2013-04-18 | 2013-04-18 | Alternating current zero-cross detection circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN203191441U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499732A (en) * | 2013-09-29 | 2014-01-08 | 湘潭大学 | Bidirectional zero-cross detection circuit and method thereof |
| CN108872695A (en) * | 2018-07-04 | 2018-11-23 | 广东省测试分析研究所（中国广州分析测试中心） | Two-phase zero passage signal detection circuit and signal transmission through fiber system |
| CN110850151A (en) * | 2019-11-04 | 2020-02-28 | 易事特集团股份有限公司 | Zero-crossing determination method and zero-crossing determination device |
| CN112833516A (en) * | 2021-01-21 | 2021-05-25 | 青岛海尔空调电子有限公司 | Communication circuit of indoor unit and outdoor unit of air conditioner and air conditioner |
-
2013
- 2013-04-18 CN CN 201320230754 patent/CN203191441U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103499732A (en) * | 2013-09-29 | 2014-01-08 | 湘潭大学 | Bidirectional zero-cross detection circuit and method thereof |
| CN108872695A (en) * | 2018-07-04 | 2018-11-23 | 广东省测试分析研究所（中国广州分析测试中心） | Two-phase zero passage signal detection circuit and signal transmission through fiber system |
| CN108872695B (en) * | 2018-07-04 | 2020-08-14 | 广东省测试分析研究所（中国广州分析测试中心） | Two-phase zero-crossing signal detection circuit and optical fiber signal transmission system |
| CN110850151A (en) * | 2019-11-04 | 2020-02-28 | 易事特集团股份有限公司 | Zero-crossing determination method and zero-crossing determination device |
| CN112833516A (en) * | 2021-01-21 | 2021-05-25 | 青岛海尔空调电子有限公司 | Communication circuit of indoor unit and outdoor unit of air conditioner and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| 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: 20130911 Termination date: 20160418 |