| 摘要 |
The present invention relates to an SMPS circuit for a water purifier, which drives the water purifier by supplying driving power, and more specifically, to an SMPS circuit for a water purifier which provides cold water of high quality by enabling a cold water driving unit to control the strength of driving power applied to a thermoelectric element, and reduces manufacturing costs by using power induced in the transformer without using a separate regulator as the driving power of a PWM unit, and has a secondary auxiliary power supply unit to stably drive the cold water driving unit which is a variable load. According to the present invention, the SMPS circuit for a water purifier comprises: a hot water driving unit to apply driving power to a heater for hot water; a valve driving unit which includes a first transformer, a first switching device which switches input power to the first transformer, a first PWM unit to control switching of the first switching device, and a first smoothing unit to smooth the output power of the first transformer and to apply the driving power to a switch valve; a cold water driving unit which includes a second transformer, a second switching device to switch input power to the second transformer, a second PWM unit to control switching of the second switching device, and a second smoothing unit to smooth the output power to the second transformer and to apply the driving power to a thermoelectric element for cold water; and a CPU to control the strength of the driving power outputted by the cold water driving unit to keep the temperature of cold water uniform. |
