| 摘要 |
A power circuit is provided to increase an electric power efficiency by adjusting a bandwidth of synthetic power and varying a switching frequency according to a PWM(Pulse Width Modulation). In a power circuit, a synthetic power(432) synthetically processes more than two types of power sources different from each other. A regulator(436) transforms an output of the synthetic power(432) to a predetermined constant voltage level. And, the power source is constructed as a power of a current transformer(30), an external constant power(50), or an output of a DC/AC converter. |
