| 摘要 |
PURPOSE: An inverter system is provided to reduce the electromagnetic noise of a product and increase the efficiency thereof by varying a carrier frequency of a PWM(Pulse Width Modulation) pulse according to a temperature change of a radiation fin to control the operation of an inverter unit. CONSTITUTION: A power unit(10) supplies an AC(Alternating Current) power. A converter(20) converts the AC power into a DC(Direct Current) power. An inverter(30) receives the DC power to convert it into a three-phase AC power, when a predetermined pulse is inputted, switches the converted three-phase AC power to a compressor(70). A temperature detecting unit(50) detects the temperature change of a radiation fin(40), the temperature change being generated by the operation of the inverter(30). A microcomputer(60) receives the temperature of the radiation fin(40) and increases or reduces the frequency of the pulse applied to the inverter(30) to vary the operation of the inverter(30).
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