Current Modulation Control Method for a Multi-Output Power Supply

Concerning a multi-output DC power supply having two or more secondary windings it was an important technical problem that the main switch would easily become a heat spot. The heat spot is predominantly caused by the power loss which occurs at the transient time. This paper describes a new circuitry and its control method that help dramatically improve the operation trajectory of the main switch and regenerate the energy stored in the main transformer's leakage inductances. Comparative measurements of the DC-DC converter section under the same conditions between a conventional multi-output power supply and the new system we developed have shown marked improvements in the reduction of peak power loss on the trajectory and of total power loss.