| 摘要 |
The current resonant converter according comprises a voltage converting transformer having a primary winding and a secondary winding, a switching circuit, disposed on the primary side of the transformer, for turning on and off a current supplied from an DC power to the transformer, a resonant circuit disposed adjacent to the transformer, a rectifying and smoothing circuit, disposed on the secondary side of the transformer, for supplying an output to a load, and a control circuit for controlling a switching frequency of the switching circuit, whereby the current resonant converter is operated in two modes, consisting of a first mode for prohibiting a DC current component from flowing in the primary winding and a second mode for allowing the DC current component to flow in the primary winding. Thus, since the allowable changing ranges of the input voltage and the load current is widened, the zero current switch can be stably operated and the peak value of current which flows in the switching device such as switching device can be decreased and thereby reducing the cost and size.
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