Importance

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Abstract

The output of an AC power source is converted into DC power through a rectifying stack and an electrolytic capacitor and this DC power is input to a chopper circuit, which includes a first switching element, flywheel diode and a coil. The chopper circuit adjusts the value of the power by changing the duty ratio of the first switching element. The output of the chopper circuit is supplied to an inverter circuit and is applied at the center tap of the primary winding of a transformer. The inverter circuit is of a voltage-oscillating type which includes the transformer, a capacitor and second and third switching elements. As the second and third switching elements are alternately switched on, the inverter circuit converts the received DC power into AC power as its output. The ON/OFF switching operation of the first through third switching elements is controlled by a control circuit in such a way that these switching elements have the same switching frequency and the middle timing of the ON duration of the first switching element of the chopper circuit coincides with a timing at which the ON duration of the second switching element of the inverter circuit is switched to the ON duration of the third switching element.

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First Claim