| 摘要 |
PURPOSE: A reversible pump of a gas boiler, a control circuit thereof, and a method for controlling the same are provided to control the speed of a motor for preventing sharp change of hot water flow, thereby preventing shocking noise from being generated. CONSTITUTION: A control circuit of a reversible pump includes a first switch(402) and a second switch(404) for switching an alternating current voltage selectively applied to a motor(400) of the reversible pump as a driving voltage according to the driving state of a gas boiler, a driving device(406) for selectively driving the first switch and the second switch according to the driving state of the gas boiler, a synchronous signal generating part(408) for detecting a plurality of zero points from the alternating current voltage during regular cycle and generating pulse signal having predetermined width in the detected zero points, and a controlling part(410) generating a first signal and a second signal for respectively controlling the first switch and the second switch to respond to the pulse signal and controlling duty cycle of the first and the second control signals when converting a mode of the gas boiler to control the phase of the driving voltage of the reversible pump.
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