CN203595750U - Zero-cross detection circuit for alternating-current power supply of gas water heater - Google Patents
Zero-cross detection circuit for alternating-current power supply of gas water heater Download PDFInfo
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- CN203595750U CN203595750U CN201320728931.4U CN201320728931U CN203595750U CN 203595750 U CN203595750 U CN 203595750U CN 201320728931 U CN201320728931 U CN 201320728931U CN 203595750 U CN203595750 U CN 203595750U
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Abstract
The utility model discloses a zero-cross detection circuit for an alternating-current power supply of a gas water heater. The zero-cross detection circuit comprises a water heater power supply input circuit, a photoelectric coupler, a first resistor, a second resistor and a third resistor. The water heater power supply input circuit includes an alternating-current input terminal and an input rectification circuit. A negative electrode terminal of an output terminal of the input rectification circuit is connected to a hot ground. A first terminal of the first resistor is connected with the live wire of the alternating-current input terminal, while a second terminal is connected with the anode of a light emitting diode of the photoelectric coupler. A first terminal of the second resistor is connected with the zero wire of the alternating-current input terminal, while a second terminal is connected with the anode of the light emitting diode of the photoelectric coupler. The cathode of the light emitting diode of the photoelectric coupler is connected to the hot ground. The collector of a photosensitive triode of the photoelectric coupler is connected to a high level, and the emitter is connected to a cold ground through the third resistor. The emitter of the photosensitive triode is used as an output terminal of the zero-cross detection circuit. According to the utility model, the zero-cross detection circuit does not need a power frequency transformer, and directly samples alternating-current input L and N lines, and transmits the sampling signal to the control chip after optical coupling isolation. The zero-cross detection circuit is simple in structure and low in cost.
Description
[technical field]
The utility model relates to gas water heater control circuit, relates in particular to a kind of zero cross detection circuit of gas heater AC power.
[background technology]
The power supply of tradition constant temp gas water heater control circuit is by supplying with after Industrial Frequency Transformer step-down.Constant temp gas water heater motor exhaust adopts bidirectional triode thyristor to drive alignment circuit to carry out speed governing, by regulating the conduction angle of bidirectional triode thyristor just can change the operating voltage of motor, realizes fan speed regulation.And the ON time of each conduction angle of bidirectional triode thyristor is to start from the phasing degree of no-voltage to calculate, so, bidirectional triode thyristor drives alignment circuit to carry out zero passage detection to the power supply of control circuit, provides a zero voltage reference for bidirectional triode thyristor drives the master chip of alignment circuit.The alternating voltage zero-crossing of tradition gas water heater control circuit detects the pulsating dc voltage sampling after Industrial Frequency Transformer step-down, rectification.Need to use larger Industrial Frequency Transformer, volume heaviness, element cost is higher, and inefficiency, and stand-by power consumption is large.
[summary of the invention]
It is simple that the technical problems to be solved in the utility model is to provide a kind of circuit, the zero cross detection circuit of lower-cost gas heater AC power.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is that a kind of zero cross detection circuit of gas heater AC power, comprises water heater power supply input circuit, photoelectrical coupler, the first resistance, the second resistance and the 3rd resistance; Water heater power supply input circuit comprises ac input end and input rectification circuit, the negative pole termination of input rectification circuit output terminal thermally, the live wire of ac input end described in the first termination of the first resistance, the anode of the second termination photoelectrical coupler light emitting diode; The zero line of ac input end described in the first termination of the second resistance, the anode of the second termination photoelectrical coupler light emitting diode; The negative electrode of photoelectrical coupler light emitting diode connects thermally; The collector of the phototriode of photoelectrical coupler connects high level, and emitter connects cold ground by the 3rd resistance, and the emitter of phototriode is as the detection signal output terminal of zero cross detection circuit.
Above-described zero cross detection circuit, water heater power supply input circuit comprises filter capacitor, bleeder resistance and filter inductance, filter capacitor is connected between the live wire and ground wire of ac input end, bleeder resistance is in parallel with filter capacitor, and filter inductance is connected between ac input end and input rectification circuit.
Zero cross detection circuit direct sample of the present utility model, in exchanging input L, N line, through light-coupled isolation, is transferred to control chip, and simple in structure, cost is lower.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the schematic diagram of the utility model embodiment gas heater AC power zero cross detection circuit.
[embodiment]
As shown in Figure 1, the zero cross detection circuit of the utility model embodiment gas heater AC power, comprises water heater control circuit, photoelectrical coupler P1, resistance R 32, resistance R 33 and resistance R 35.
Water heater power supply input circuit comprises ac input end, input rectification circuit, filter capacitor CX1, bleeder resistance R10 and filter inductance L1.Ac input end comprises live wire L and zero line N, and filter capacitor CX1 is connected between the live wire and ground wire of ac input end, and bleeder resistance R10 is in parallel with filter capacitor CX1, and filter inductance L1 is connected between ac input end and input rectification circuit.
Input rectification circuit forms full-wave rectifying circuit by diode D2-D5, the negative pole termination of input rectification circuit output terminal thermally,
The live wire L of the first termination ac input end of zero cross detection circuit resistance R 32, the anode of the second termination photoelectrical coupler P1 light emitting diode.The zero line N of the first termination ac input end of resistance R 33, the anode of the second termination photoelectrical coupler P1 light emitting diode.The negative electrode of photoelectrical coupler P1 light emitting diode connects thermally.The collector of photoelectrical coupler P1 phototriode connects 5V high level, and emitter connects cold ground by resistance R 35, and the lead-in wire ZD of the emitter of phototriode is as the detection signal output terminal of zero cross detection circuit.
AC voltage, after resistance R 32, R33 step-down and D2, D5 rectification, forms pulsating dc voltage at the anode (B point) of photoelectrical coupler P1 light emitting diode; In the time that B point voltage is greater than 0.7V, optocoupler P1 conducting, forms high level at ZD port; When B point voltage is during lower than 0.7V, optocoupler P1 cut-off, forms low level at ZD port.Like this, by conducting repeatedly, the cut-off of phototriode, form 100Hz pulse waveform at control chip zero passage detection port ZD point, control chip, by going to regulate the conduction angle of bidirectional triode thyristor just can change the operating voltage of motor the zero point of detecting AC voltage, is realized fan speed regulation.
The zero cross detection circuit of the above embodiment gas heater of the utility model AC power provides a benchmark for control chip, and the starting point of this benchmark is no-voltage, and the size of thyristor operating angle is exactly according to this benchmark.Constant temp gas water heater motor exhaust adopts bidirectional triode thyristor to drive alignment circuit, by regulating the conduction angle of bidirectional triode thyristor just can change the operating voltage of motor, realizes fan speed regulation.And the ON time of each conduction angle starts to calculate from no-voltage, ON time is different, and the size of angle of flow is just different, and therefore the rotating speed of motor is just different.
The above embodiment of the utility model does not need Industrial Frequency Transformer, and zero cross detection circuit direct sample, in exchanging input L, N line, through light-coupled isolation, is transferred to control chip, and simple in structure, cost is lower.
Claims (2)
1. the zero cross detection circuit of a gas heater AC power, comprise water heater power supply input circuit, water heater power supply input circuit comprises ac input end and input rectification circuit, the negative pole termination of input rectification circuit output terminal thermally, it is characterized in that, comprise photoelectrical coupler, the first resistance, the second resistance and the 3rd resistance; The live wire of ac input end described in the first termination of the first resistance, the anode of the second termination photoelectrical coupler light emitting diode; The zero line of ac input end described in the first termination of the second resistance, the anode of the second termination photoelectrical coupler light emitting diode; The negative electrode of photoelectrical coupler light emitting diode connects thermally; The collector of the phototriode of photoelectrical coupler connects high level, and emitter connects cold ground by the 3rd resistance, and the emitter of phototriode is as the detection signal output terminal of zero cross detection circuit.
2. zero cross detection circuit according to claim 1, it is characterized in that, water heater power supply input circuit comprises filter capacitor, bleeder resistance and filter inductance, filter capacitor is connected between the live wire and ground wire of ac input end, bleeder resistance is in parallel with filter capacitor, and filter inductance is connected between ac input end and input rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320728931.4U CN203595750U (en) | 2013-11-18 | 2013-11-18 | Zero-cross detection circuit for alternating-current power supply of gas water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320728931.4U CN203595750U (en) | 2013-11-18 | 2013-11-18 | Zero-cross detection circuit for alternating-current power supply of gas water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203595750U true CN203595750U (en) | 2014-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320728931.4U Expired - Fee Related CN203595750U (en) | 2013-11-18 | 2013-11-18 | Zero-cross detection circuit for alternating-current power supply of gas water heater |
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| CN (1) | CN203595750U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005942A (en) * | 2018-01-02 | 2018-05-08 | 成都前锋电子有限责任公司 | A kind of gas instantaneous water heater AC blower fan control system |
| CN109100557A (en) * | 2018-08-07 | 2018-12-28 | 六安市同心畅能电子科技有限公司 | Electronic active photoelectric current inductor |
-
2013
- 2013-11-18 CN CN201320728931.4U patent/CN203595750U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108005942A (en) * | 2018-01-02 | 2018-05-08 | 成都前锋电子有限责任公司 | A kind of gas instantaneous water heater AC blower fan control system |
| CN108005942B (en) * | 2018-01-02 | 2023-11-24 | 成都前锋电子有限责任公司 | Alternating current fan control system of gas rapid water heater |
| CN109100557A (en) * | 2018-08-07 | 2018-12-28 | 六安市同心畅能电子科技有限公司 | Electronic active photoelectric current inductor |
| CN109100557B (en) * | 2018-08-07 | 2020-11-20 | 六安市同心畅能电子科技有限公司 | Electronic active photoelectric current transformer |
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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: 20140514 Termination date: 20171118 |