CN202083738U - Zero crossing checking circuit - Google Patents
Zero crossing checking circuit Download PDFInfo
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- CN202083738U CN202083738U CN2011201057210U CN201120105721U CN202083738U CN 202083738 U CN202083738 U CN 202083738U CN 2011201057210 U CN2011201057210 U CN 2011201057210U CN 201120105721 U CN201120105721 U CN 201120105721U CN 202083738 U CN202083738 U CN 202083738U
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Abstract
The utility model provides a zero crossing checking circuit, comprising a first switch circuit, a second switch circuit and an isolated circuit, wherein an input end of the first switch circuit is connected with commercial power rectifying pulsating voltage, an input end of the second switch circuit is connected with an output end of the first switch circuit, the isolated circuit is connected with the output end of the second switch circuit, the first switch circuit comprises a first triode, the second switch circuit comprises a second triode, a base electrode of the first triode is connected with the commercial power rectifying pulsating voltage, an emitting electrode is grounded, the output of a collecting electrode is connected with a base electrode and a power source of the second triode, an emitting electrode of the second triode is grounded, the output of the collecting electrode is connected with the isolated circuit, the second switch circuit further comprises a first diode arranged between the collecting electrode arranged at the first triode and a base electrode arranged at the second triode, and a negative electrode of the first diode is connected with the base electrode of the second triode. The zero crossing checking circuit is exact in detection, and stable in output electrical level.
Description
Technical field
The utility model belongs to the testing circuit technical field of relevant motor, relates in particular to electric machine speed regulation zero cross detection circuit field.
Background technology
The speed regulating control principle of PG motor (a kind of motor that has Hall element) is the inside that Hall element is installed in motor, and just often blower fan whenever circles, and Hall element is exported one or several pulse signal.When fan motor rotational speed is high, its output pulse signal frequency height; When fan motor rotational speed was low, its output pulse signal frequency was low.The pulse signal of output is gathered by single-chip microcomputer, thereby adjusts the operating voltage of PG motor by adjusting the silicon controlled conduction angle then, carries out the automatic control of wind speed.Phase place is opened in its delay with SCR control 50Hz civil power, the rotating speed of the blower fan of the effective voltage of controlling and driving blower fan, and then control indirectly.The zero passage potential detecting circuit be exactly detect 50Hz civil power phase voltage be 0 promptly adjust phase delay constantly benchmark constantly; In the half period of 50Hz civil power, when phase place time-delay arrival is opened constantly, provide a trigger pulse by single-chip microcomputer by optocoupler, it is open-minded to trigger bidirectional triode thyristor.Utilize on-off circuit series connection back to connect buffer circuit (3) in the prior art and form testing circuit, but the detection of sort circuit not very accurate, and the switching that when different on-off circuits take turns conducting, makes a mistake easily, thereby the output level shake takes place.
Summary of the invention
At the deficiency of above-mentioned existing testing circuit, the utility model provides a kind of zero cross detection circuit, and this zero cross detection circuit detects accurately, stabilizing output level.
Technical solution of the present utility model is: a kind of zero cross detection circuit, comprise that input end connects first on-off circuit of commercial power rectification pulsating volage, input end connects the second switch circuit and the buffer circuit that is connected the second switch circuit output end of the first on-off circuit output terminal, wherein, first on-off circuit comprises first triode, the second switch circuit comprises second triode, the base stage of first triode connects the commercial power rectification pulsating volage, emitter grounding, collector output is connected to the base stage and the power supply of second triode, the emitter grounding of second triode, collector output is connected to buffer circuit, described second switch circuit also comprises first diode between the base stage of the collector that is located at first triode and second triode, and the negative electrode of first diode is connected to second transistor base.
Described second switch circuit also comprises the collector that is located at first triode and the 3rd resistance between the power supply.
Described first on-off circuit also comprises first resistance, second resistance and first electric capacity, and wherein first resistance, one end is connected to the commercial power rectification pulsating volage, and an other end is connected to first transistor base; End after second resistance and the first electric capacity parallel connection is connected to first transistor base, an other end ground connection.
Described buffer circuit comprises photoelectrical coupler, and this photoelectrical coupler the 1st, 4 pin connects power supply, and the 2nd pin connects second transistor collector, and the 3rd pin connects the MCU mouth by the PC4 pin.
The utility model detects accurately, stabilizing output level.
Description of drawings
Fig. 1 is the utility model schematic diagram;
Fig. 2 is the utility model embodiment circuit diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described further.
As Fig. 1, shown in 2, a kind of zero cross detection circuit, comprise that input end connects first on-off circuit 1 of 220V commercial power rectification pulsating volage 4, input end connects the second switch circuit 2 and the buffer circuit 3 that is connected second switch circuit 2 output terminals of first on-off circuit, 1 output terminal, wherein, first on-off circuit 1 comprises the first triode V101, second switch circuit 2 comprises the second triode V102, the base stage of the first triode V101 connects 220V commercial power rectification pulsating volage 4, emitter grounding, collector output is connected to base stage and the power supply VCC of the second triode V102, the emitter grounding of the second triode V102, collector output is connected to buffer circuit 3, described second switch circuit 2 also comprises the first diode V103 between the base stage of the collector that is located at the first triode V101 and the second triode V102, and the negative electrode of the first diode V103 is connected to the second triode V102 base stage.
Described second switch circuit 2 also comprises the collector that is located at the first triode V101 and the 3rd resistance R 103 between the power supply VCC.
Described first on-off circuit 1 also comprises first resistance R 101, second resistance R 102 and first capacitor C 101, and wherein first resistance R, 101 1 ends are connected to 220V commercial power rectification pulsating volage 4, and an other end is connected to the first triode V101 base stage; End after second resistance R 102 and 101 parallel connections of first capacitor C is connected to the first triode V101 base stage, an other end ground connection.
Described buffer circuit 3 comprises photoelectrical coupler B101, and this photoelectrical coupler B101 the 1st, 4 pin meets power supply VCC, and the 2nd pin connects the second triode V102 collector, and the 3rd pin connects the MCU mouth by the PC4 pin.
Present embodiment utilize first on-off circuit 1 and second switch circuit 2 in turn conducting accurately control buffer circuit 3 strong power part conductings, export to the accurate zero crossing of MCU then to control the silicon controlled conduction angle.
When 1 conducting of first on-off circuit, second switch circuit 2 ends, photoelectrical coupler B101 is a high level in PC4 pin output in the buffer circuit 3, when first switch, 1 ends, 2 conductings of second switch circuit, photoelectrical coupler B101 is a low level in PC4 pin output in the buffer circuit 3, and the first diode V103 is arranged in second switch circuit 2, make the in turn conducting of win on-off circuit 1 and second switch circuit 2 switchings that can not make a mistake. be that the PC4 pin of photoelectrical coupler B101 in the buffer circuit 3 level can not take place is shaken.
The utility model detects accurately, stabilizing output level.
Claims (4)
1. zero cross detection circuit, comprise that input end connects first on-off circuit (1) of commercial power rectification pulsating volage (4), input end connects the second switch circuit (2) and the buffer circuit (3) that is connected second switch circuit (2) output terminal of first on-off circuit (1) output terminal, wherein, first on-off circuit (1) comprises first triode (V101), second switch circuit (2) comprises second triode (V102), the base stage of first triode (V101) connects commercial power rectification pulsating volage (4), emitter grounding, collector output is connected to the base stage and the power supply (VCC) of second triode (V102), the emitter grounding of second triode (V102), collector output is connected to buffer circuit (3), it is characterized in that: described second switch circuit (2) also comprises first diode (V103) between the base stage of the collector that is located at first triode (V101) and second triode (V102), and the negative electrode of first diode (V103) is connected to second triode (V102) base stage.
2. zero cross detection circuit according to claim 1 is characterized in that: described second switch circuit (2) also comprises the collector that is located at first triode (V101) and the 3rd resistance (R103) between the power supply (VCC).
3. zero cross detection circuit according to claim 2, it is characterized in that: described first on-off circuit (1) also comprises first resistance (R101), second resistance (R102) and first electric capacity (C101), wherein first resistance (R101) end is connected to commercial power rectification pulsating volage (4), and an other end is connected to first triode (V101) base stage; End after second resistance (R102) and first electric capacity (C101) parallel connection is connected to first triode (V101) base stage, an other end ground connection.
4. according to each described zero cross detection circuit among the claim 1-3, it is characterized in that: described buffer circuit (3) comprises photoelectrical coupler (B101), this photoelectrical coupler (B101) the 1st, 4 pin connect power supply (VCC), the 2nd pin connects second triode (V102) collector, and the 3rd pin connects the MCU mouth by the PC4 pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201057210U CN202083738U (en) | 2011-04-12 | 2011-04-12 | Zero crossing checking circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201057210U CN202083738U (en) | 2011-04-12 | 2011-04-12 | Zero crossing checking circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202083738U true CN202083738U (en) | 2011-12-21 |
Family
ID=45344364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011201057210U Expired - Fee Related CN202083738U (en) | 2011-04-12 | 2011-04-12 | Zero crossing checking circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202083738U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424606A (en) * | 2013-07-26 | 2013-12-04 | 珠海钱龙载波***有限公司 | Frequency-adaptive low-voltage power carrier communication zero-crossing detection circuit |
| CN106980039A (en) * | 2016-01-24 | 2017-07-25 | 广州市金矢电子有限公司 | Zero crossing detection device and synchro switch |
| WO2017125056A1 (en) * | 2016-01-24 | 2017-07-27 | 广州市金矢电子有限公司 | Zero-crossing detection apparatus and synchronous switch |
-
2011
- 2011-04-12 CN CN2011201057210U patent/CN202083738U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103424606A (en) * | 2013-07-26 | 2013-12-04 | 珠海钱龙载波***有限公司 | Frequency-adaptive low-voltage power carrier communication zero-crossing detection circuit |
| CN103424606B (en) * | 2013-07-26 | 2016-01-13 | 珠海钱龙载波***有限公司 | A kind of low voltage electric power carrier communication zero cross detection circuit of frequency self-adaption |
| CN106980039A (en) * | 2016-01-24 | 2017-07-25 | 广州市金矢电子有限公司 | Zero crossing detection device and synchro switch |
| WO2017125056A1 (en) * | 2016-01-24 | 2017-07-27 | 广州市金矢电子有限公司 | Zero-crossing detection apparatus and synchronous switch |
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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: 20111221 Termination date: 20170412 |