| 摘要 |
PROBLEM TO BE SOLVED: To regulate with high efficiency, with a simple structure, over a range from a light load to rated load. SOLUTION: When the output voltage of a rectifying and smoothing circuit 4 is compared with a reference voltage and a drop in its output is detected, a comparative result fed back negatively by an output voltage feedback circuit 5 is A/D converted by an A/D conversion circuit 10 to output a multivalued digital signal. As a result, a bidirectional switching device 2 inserted in the primary side of a transformer 1 is turned on or off, synchronously or asychronously with a commercial power source 8 via an intermittent control circuit 3.
|
