Fujitsu Denso Ltd.

Katsuyuki Asahi

Kazuo Kobayashi

Hiroo Tanaka

Fumiaki Ihara

Osamu Kinoshita

A current-balance switching regulator in which a plurality of switching power source portions are connected in parallel for the purpose of supplying a stabilized output voltage to a load. Each of the switching power source portions includes a switching control portion for controlling a switching element connected to the primary side of a transformer in accordance with the output voltage on the secondary side of the transformer. Current is detected on the primary side of the portions. When a current unbalance is detected, current balance is arranged by adding the amount of unbalance equally among the portions, so concentration of the load to a particular portion can be prevented. As a result of such averaging, the life of each portion can be lengthened. The portions are connected so that one is made a master and the rest are slaves, so the output voltage can be determined by a variable resistor or the like. A limiter is provided to limit the amount of unbalance added, and an integrator is provided so the amount of unbalance added is smooth so that operation is stabilized.

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Machida, Japan

Katsuyuki Asahi