CN201113782Y - Zero-cross detection circuit for switch power circuit - Google Patents
Zero-cross detection circuit for switch power circuit Download PDFInfo
- Publication number
- CN201113782Y CN201113782Y CNU2007201726976U CN200720172697U CN201113782Y CN 201113782 Y CN201113782 Y CN 201113782Y CN U2007201726976 U CNU2007201726976 U CN U2007201726976U CN 200720172697 U CN200720172697 U CN 200720172697U CN 201113782 Y CN201113782 Y CN 201113782Y
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- cross detection
- detection circuit
- switching power
- zero cross
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Abstract
The utility model discloses a zero-cross detection circuit used for a switching power circuit, comprising a photocoupler and a diode, wherein, a first input electrode and a second input electrode of the photocoupler are respectively connected with an L terminal and an N terminal of a mains supply, a first output electrode is connected with a port of a singlechip, and a second output electrode is earthed; the diode is connected with the first input electrode and the second input electrode and is unilaterally communicated in the direction from the second input electrode to the first input electrode. The zero-cross detection circuit can realize an effective isolation of alternating current and direct current in the switching power circuit.
Description
Technical field
The utility model relates to the zero cross detection circuit technology, relates in particular to a kind of zero cross detection circuit that is used for switching power circuit.
Background technology
Zero cross detection circuit is used to detect the zero crossing of alternating current, all can use in a lot of circuit; In the transformer frequency response circuit, can directly zero crossing circuitry be received transformer secondary output, zero cross detection circuit can be kept apart with alternating current circuit; But in switching power circuit, zero cross detection circuit directly is connected on AC power L end, the N end, can't realize alternating current and galvanic isolation.
The utility model content
Technical problem to be solved in the utility model is: a kind of zero cross detection circuit that is used for switching power circuit is provided, and this circuit can be realized alternating current and galvanic isolation in the switching power circuit.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of zero cross detection circuit that is used for switching power circuit, this circuit comprises a photoelectrical coupler and a diode, the first input utmost point, the second input utmost point of described photoelectrical coupler link to each other with AC power L end, N end respectively, first output stage links to each other with one-chip machine port, the second output stage ground connection; Described diode and described first is imported the utmost point, second input extremely links to each other and import the unidirectional conducting of extreme direction from the second input utmost point to the first.
The beneficial effects of the utility model are:
Embodiment of the present utility model keeps apart the direct current signal that AC power links to each other with single-chip microcomputer by utilizing photoelectrical coupler, has realized alternating current and galvanic effective isolation in the switching power circuit.
Below in conjunction with accompanying drawing the utility model is described in further detail.
Description of drawings
Fig. 1 is the circuit theory diagrams of the embodiment of the zero cross detection circuit that is used for switching power circuit that provides of the utility model.
Embodiment
With reference to figure 1, the circuit theory diagrams of the embodiment of the zero cross detection circuit that is used for switching power circuit that this figure the utility model provides.As shown in the figure, this circuit comprises photoelectrical coupler U1 and diode D1, and the first input utmost point, the second input utmost point of described photoelectrical coupler link to each other with AC power L end, N end respectively, and first output stage links to each other with one-chip machine port, the second output stage ground connection; Described diode D1 and described first imports the utmost point, second input extremely links to each other and from the unidirectional conducting of the second input utmost point to the first input extreme direction, also be parallel with capacitor C 1 on the diode D1.
In addition, the described photoelectrical coupler first input utmost point also is connected with bleeder circuit, and the dividing potential drop of circuit realizes with the AC power L end resistance R that input extremely links to each other with photoelectrical coupler 1 respectively by two ends.
In addition, described photoelectrical coupler output stage also is connected with shaping circuit, described shaping circuit comprises resistance R 3, a termination 5V power supply that is connected between first output stage and the single-chip microcomputer, and the resistance R 2 and an end of a termination first input utmost point link to each other the discharge capacity C2 of an end ground connection with single-chip microcomputer.
At alternating current positive pressure half cycle, when being added to photoelectrical coupler U1 input pole tension greater than can make the voltage of its LED conducting the time, the conducting of photoelectrical coupler U1 output stage, the zero cross signal ZERO that connects single-chip microcomputer is 0; When alternating voltage negative half period and positive half cycle voltage were low, the voltage that is added to the photoelectrical coupler U1 input utmost point was less than its LED conducting voltage, not conducting of output stage, and zero cross signal ZERO is 1.
Output signal ZERO is connected to the interruption detection port of single-chip microcomputer, and single-chip microcomputer produces interruption when detecting the trailing edge of zero cross signal ZERO, promptly interrupts producing the processing that can be correlated with when interrupting producing when the zero crossing of AC power.
This zero cross detection circuit can make AC/DC isolate fully, and is very useful in the occasion of using Switching Power Supply and need to isolate.
The above is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also are considered as protection range of the present utility model.
Claims (5)
1, a kind of zero cross detection circuit that is used for switching power circuit, it is characterized in that, this circuit comprises a photoelectrical coupler and a diode, the first input utmost point, the second input utmost point of described photoelectrical coupler link to each other with AC power L end, N end respectively, first output stage links to each other with one-chip machine port, the second output stage ground connection; Described diode and described first is imported the utmost point, second input extremely links to each other and import the unidirectional conducting of extreme direction from the second input utmost point to the first.
2, the zero cross detection circuit that is used for switching power circuit as claimed in claim 1 is characterized in that, the described photoelectrical coupler first input utmost point also is connected with bleeder circuit.
3, the zero cross detection circuit that is used for switching power circuit as claimed in claim 1 or 2 is characterized in that, described photoelectrical coupler output stage also is connected with shaping circuit.
4, the zero cross detection circuit that is used for switching power circuit as claimed in claim 2 is characterized in that, described bleeder circuit comprises the resistance that hold with AC power L respectively at two ends and the photoelectrical coupler input extremely links to each other.
5, the zero cross detection circuit that is used for switching power circuit as claimed in claim 3, it is characterized in that, described shaping circuit comprises resistance, a termination 5V power supply that is connected between first output stage and the single-chip microcomputer, the resistance and an end of one termination, first output stage link to each other the discharge capacity of an end ground connection with single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201726976U CN201113782Y (en) | 2007-10-26 | 2007-10-26 | Zero-cross detection circuit for switch power circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201726976U CN201113782Y (en) | 2007-10-26 | 2007-10-26 | Zero-cross detection circuit for switch power circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201113782Y true CN201113782Y (en) | 2008-09-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201726976U Expired - Fee Related CN201113782Y (en) | 2007-10-26 | 2007-10-26 | Zero-cross detection circuit for switch power circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN201113782Y (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062810A (en) * | 2010-12-14 | 2011-05-18 | 江苏大学 | Detection circuit and method for zero crossing point of alternating current power supply |
| CN102253334A (en) * | 2011-06-15 | 2011-11-23 | 杭州炬华科技股份有限公司 | Circuit for detecting open and close states of relay for electric energy meter |
| CN102323472A (en) * | 2011-09-08 | 2012-01-18 | 广州市金矢电子有限公司 | Voltage zero crossing detection device and zero crossing fling-cut switch |
| 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 |
| CN102662125A (en) * | 2012-05-10 | 2012-09-12 | 杭州浙大桑尼能源科技有限公司 | Method and circuit for detecting power line and zero line |
| CN102778602A (en) * | 2012-07-27 | 2012-11-14 | 电子科技大学 | Zero-cross detection circuit |
| CN105891589A (en) * | 2016-05-26 | 2016-08-24 | 宁波三星医疗电气股份有限公司 | Zero crossing detection circuit for power lines and manufacturing method of zero crossing detection circuit |
| CN111149005A (en) * | 2017-07-31 | 2020-05-12 | 罗姆股份有限公司 | Zero-crossing detection circuit |
| US11733275B2 (en) | 2017-07-31 | 2023-08-22 | Rohm Co., Ltd. | Zero-crossing detection circuit |
-
2007
- 2007-10-26 CN CNU2007201726976U patent/CN201113782Y/en not_active Expired - Fee Related
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062810A (en) * | 2010-12-14 | 2011-05-18 | 江苏大学 | Detection circuit and method for zero crossing point of alternating current power supply |
| CN102253334A (en) * | 2011-06-15 | 2011-11-23 | 杭州炬华科技股份有限公司 | Circuit for detecting open and close states of relay for electric energy meter |
| 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 |
| CN102323472A (en) * | 2011-09-08 | 2012-01-18 | 广州市金矢电子有限公司 | Voltage zero crossing detection device and zero crossing fling-cut switch |
| CN102662125A (en) * | 2012-05-10 | 2012-09-12 | 杭州浙大桑尼能源科技有限公司 | Method and circuit for detecting power line and zero line |
| CN102778602B (en) * | 2012-07-27 | 2014-07-02 | 电子科技大学 | Zero-cross detection circuit |
| CN102778602A (en) * | 2012-07-27 | 2012-11-14 | 电子科技大学 | Zero-cross detection circuit |
| CN105891589A (en) * | 2016-05-26 | 2016-08-24 | 宁波三星医疗电气股份有限公司 | Zero crossing detection circuit for power lines and manufacturing method of zero crossing detection circuit |
| CN105891589B (en) * | 2016-05-26 | 2018-12-25 | 宁波三星医疗电气股份有限公司 | A kind of zero cross detection circuit and preparation method thereof for power line |
| CN111149005A (en) * | 2017-07-31 | 2020-05-12 | 罗姆股份有限公司 | Zero-crossing detection circuit |
| US11181562B2 (en) | 2017-07-31 | 2021-11-23 | Rohm Co., Ltd. | Zero-crossing detection circuit |
| CN111149005B (en) * | 2017-07-31 | 2022-04-01 | 罗姆股份有限公司 | Zero-crossing detection circuit |
| US11733275B2 (en) | 2017-07-31 | 2023-08-22 | Rohm Co., Ltd. | Zero-crossing detection circuit |
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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 |
Granted publication date: 20080910 Termination date: 20161026 |
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| CF01 | Termination of patent right due to non-payment of annual fee |