CN201773146U - Commercial power zero-crossing detection circuit - Google Patents
Commercial power zero-crossing detection circuit Download PDFInfo
- Publication number
- CN201773146U CN201773146U CN2010205152690U CN201020515269U CN201773146U CN 201773146 U CN201773146 U CN 201773146U CN 2010205152690 U CN2010205152690 U CN 2010205152690U CN 201020515269 U CN201020515269 U CN 201020515269U CN 201773146 U CN201773146 U CN 201773146U
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- circuit
- zero cross
- civil power
- power zero
- optocoupler
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- 238000001514 detection method Methods 0.000 title claims abstract description 21
- 238000002955 isolation Methods 0.000 claims abstract description 17
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000005070 sampling Methods 0.000 abstract 3
- 238000010586 diagram Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
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Abstract
The utility model relates to a commercial power zero cross detection circuit, its characterized in that includes signal sampling circuit (1) and level shift circuit (2), and the input and the commercial power of signal sampling circuit (1) are connected, and the output is connected with the input of level shift circuit (2), and the output of level shift circuit (2) exports commercial power zero cross signal. The beneficial effects of the utility model reside in that, the relatively traditional complex commercial power zero cross detection circuit of taking isolation, the utility model discloses chooseed for use signal sampling circuit and level conversion circuit that have less electronic components and have just realized the commercial power zero cross signal detection of taking isolation, its circuit connection is simple, easily realizes, and low cost, and the reliability is high.
Description
Technical field
The utility model is a kind of civil power zero cross detection circuit, particularly a kind of civil power zero cross detection circuit that is used for household electrical appliance, the civil power zero cross detection circuit that especially a kind of needs that are used for electromagnetic oven are isolated.
Background technology
The general civil power zero cross detection circuit that adopts non-isolation of the control system of household electrical appliance such as existing electromagnetic oven, this circuit comprises triode or comparer.In order to improve anti-interference level, control system can adopt shielding system that forceful electric power and light current are isolated, if used the civil power zero cross signal like this in the system, just require to design the civil power zero cross detection circuit that a band is isolated, and existing non-isolation civil power zero cross detection circuit wants to realize isolated civil power zero passage detection, can only realize this scheme cost height by adding optocoupler U1, the circuit complexity, reliability is low.
Summary of the invention
The purpose of this utility model is to consider the problems referred to above and a kind of low cost is provided that circuit is simple, the civil power zero cross detection circuit that the band that reliability is high is isolated.
The technical solution of the utility model is: a kind of civil power zero cross detection circuit, it is characterized in that comprising signal sample circuit and level shifting circuit, the input end of signal sample circuit is electrically connected with the city, output terminal is connected with the input end of level shifting circuit, the output terminal output civil power zero cross signal of level shifting circuit.
Described signal sample circuit comprises first current-limiting resistance, second current-limiting resistance, reverse protection diode and isolates optocoupler; first current-limiting resistance, isolation optocoupler and second current-limiting resistance are connected between the zero line N and live wire L of civil power successively, and the reverse protection diode reverse is connected in parallel between two input ports of isolating optocoupler.
Described level shifting circuit comprises first level conversion resistance and the system power supply, and the collector of the isolation optocoupler in an end of the first level conversion resistance and the signal sample circuit links to each other, and the other end links to each other with system power supply, isolates the grounded emitter of optocoupler.
Described level shifting circuit comprises second level conversion resistance and the system power supply, one end of the second level conversion resistance links to each other with the emitter of isolation optocoupler in the signal sample circuit, other end ground connection, system power supply VDD links to each other with the collector of isolation optocoupler in the signal sample circuit.
The beneficial effects of the utility model are, the civil power zero cross detection circuit that the band of traditional relatively complexity is isolated, the utility model has selected for use signal sample circuit and level shifting circuit with less electronic devices and components just to realize that the civil power zero cross signal that band is isolated detects, its circuit connects simple, be easy to realize, and with low cost, the reliability height.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model;
Fig. 2 is the circuit diagram of the utility model embodiment 1;
Fig. 3 is the civil power zero cross signal oscillogram of the utility model embodiment 1;
Fig. 4 is the circuit diagram of the utility model embodiment 2;
Fig. 5 is the civil power zero cross signal oscillogram of the utility model embodiment 2.
Embodiment
Below in conjunction with drawings and Examples the utility model civil power zero cross detection circuit is further described.
Embodiment 1:
As shown in Figure 1, the utility model civil power zero cross detection circuit comprises signal sample circuit 1 and level shifting circuit 2, and the input end of signal sample circuit 1 is electrically connected with the city, output terminal is connected with the input end of level shifting circuit 2, the output terminal output civil power zero cross signal of level shifting circuit 2.
As shown in Figure 2; described signal sample circuit 1 comprises the first current-limiting resistance R1, the second current-limiting resistance R2, reverse protection diode D1 and isolates optocoupler U1; the first current-limiting resistance R1, isolation optocoupler U1 and the second current-limiting resistance R2 are connected between the zero line N and live wire L of civil power successively, and reverse protection diode D1 is connected in reverse parallel between two input ports of isolating optocoupler U1.
Described level shifting circuit 2 comprises the first level conversion resistance R 3 and system power supply VDD, the collector C of isolation optocoupler U1 in one end of the first level conversion resistance R 3 and the signal sample circuit 1 links to each other, the other end links to each other with system power supply VDD, isolates the grounded emitter of optocoupler U1.
In the present embodiment, the above-mentioned first current-limiting resistance R1 gets 47K Ω, and the second current-limiting resistance R2 gets 47K Ω, and diode D1 selects 1N4148 for use, isolates optocoupler U1 and selects PC817 for use, and the first level conversion resistance R 3 is got 4.7K Ω.
As shown in Figure 3, waveform I represents ac signal, and the waveform II is represented the civil power zero cross signal.The principle of work of present embodiment is, when the light emitting diode in isolating optocoupler U1 arrives certain value greatly by forward current, output phototriode saturation conduction, its C utmost point output voltage approaches zero potential, when electric current passes through backward dioded, light emitting diode among the isolation optocoupler U1 does not have electric current to be passed through, the output phototriode ends, its C utmost point output voltage is system power supply voltage VDD, the C pole tension of phototriode is along with the saltus step of the one-period generation high-low level of civil power, and this skip signal is just represented the civil power zero cross signal.
Embodiment 2:
As shown in Figure 4, the difference of present embodiment and embodiment 1 is, described level shifting circuit 2 comprises the second level conversion resistance R 4 and system power supply VDD, one end of the second level conversion resistance R 4 links to each other with the emitter E of isolation optocoupler U1 in the signal sample circuit 1, other end ground connection, system power supply VDD links to each other with the collector C of isolation optocoupler U1 in the signal sample circuit 1.Other circuit connects identical with embodiment 1.
As shown in Figure 5, waveform I represents ac signal, and the waveform II is represented the civil power zero cross signal.The principle of work of present embodiment is, when the forward current that passes through when the light emitting diode among the optocoupler U1 reaches certain value, output phototriode saturation conduction, its C utmost point output voltage approaches system power supply voltage VDD, when electric current passes through backward dioded, light emitting diode among the optocoupler U1 does not have electric current to be passed through, the output phototriode ends, its C utmost point output voltage is a zero potential, the C pole tension of phototriode is along with the saltus step of the one-period generation high-low level of civil power, and this skip signal just can be represented the zero passage of civil power.
Claims (4)
1. civil power zero cross detection circuit, it is characterized in that comprising signal sample circuit (1) and level shifting circuit (2), the input end of signal sample circuit (1) is electrically connected with the city, output terminal is connected with the input end of level shifting circuit (2), the output terminal output civil power zero cross signal of level shifting circuit (2).
2. civil power zero cross detection circuit according to claim 1; it is characterized in that described signal sample circuit (1) comprises first current-limiting resistance (R1), second current-limiting resistance (R2), reverse protection diode (D1) and isolates optocoupler (U1); first current-limiting resistance (R1), isolation optocoupler (U1) and second current-limiting resistance (R2) are connected between the zero line N and live wire L of civil power successively, and reverse protection diode (D1) is connected in reverse parallel between two input ports of isolating optocoupler (U1).
3. civil power zero cross detection circuit according to claim 1, it is characterized in that described level shifting circuit (2) comprises the first level conversion resistance (R3) and system power supply (VDD), the collector (C) of the isolation optocoupler (U1) in one end of the first level conversion resistance (R3) and the signal sample circuit (1) links to each other, the other end links to each other with system power supply (VDD), isolates emitter (E) ground connection of optocoupler (U1).
4. civil power zero cross detection circuit according to claim 1, it is characterized in that described level shifting circuit (2) comprises the second level conversion resistance (R4) and system power supply (VDD), one end of the second level conversion resistance (R4) links to each other with the emitter (E) of isolation optocoupler (U1) in the signal sample circuit (1), other end ground connection, system power supply VDD links to each other with the collector (C) of isolation optocoupler (U1) in the signal sample circuit (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205152690U CN201773146U (en) | 2010-09-03 | 2010-09-03 | Commercial power zero-crossing detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205152690U CN201773146U (en) | 2010-09-03 | 2010-09-03 | Commercial power zero-crossing detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201773146U true CN201773146U (en) | 2011-03-23 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010205152690U Expired - Lifetime CN201773146U (en) | 2010-09-03 | 2010-09-03 | Commercial power zero-crossing detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201773146U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501587A (en) * | 2016-11-04 | 2017-03-15 | 青岛新芯智能电子科技有限公司 | Isolated accurate zero cross detection circuit |
| CN109869881A (en) * | 2019-03-14 | 2019-06-11 | 苏州旋凌科技有限公司 | It is a kind of for judging the method and circuit of the operating status of compressor |
| CN110749770A (en) * | 2019-06-25 | 2020-02-04 | 深圳市聚芯影像有限公司 | Commercial power detection sampling circuit |
-
2010
- 2010-09-03 CN CN2010205152690U patent/CN201773146U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501587A (en) * | 2016-11-04 | 2017-03-15 | 青岛新芯智能电子科技有限公司 | Isolated accurate zero cross detection circuit |
| CN109869881A (en) * | 2019-03-14 | 2019-06-11 | 苏州旋凌科技有限公司 | It is a kind of for judging the method and circuit of the operating status of compressor |
| CN110749770A (en) * | 2019-06-25 | 2020-02-04 | 深圳市聚芯影像有限公司 | Commercial power detection sampling circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MANUFACTURING Co.,Ltd. Assignor: Midea Group Contract record no.: 2012440000405 Denomination of utility model: Mains supply zero cross detection circuit Granted publication date: 20110323 License type: Exclusive License Record date: 20120712 |
|
| C56 | Change in the name or address of the patentee |
Owner name: MIDEA GROUP CO., LTD. Free format text: FORMER NAME: MEIDI GROUP CO. LTD. |
|
| CP03 | Change of name, title or address |
Address after: 528311 Guangdong, Foshan, Beijiao, the United States, the United States and the United States on the avenue of the United States, the headquarters of the United States building B floor, District, 26-28 Patentee after: MIDEA GROUP Co.,Ltd. Address before: 528311 beautiful road, Beijiao Town, Shunde District, Guangdong, Foshan Patentee before: Midea Group |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110323 |