Importance

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Abstract

An RCC-type switching power supply has a main switch means 9 which is repeatedly rendered conductive and cut off to cause a switching current to flow through a primary winding 31 for transferring energy from a primary side to a secondary side due to flyback operation. A snubber circuit 5a.about.5c has a snubber capacitor 7 and an auxiliary switch means 3 which are connected in series with each other and parallel to the primary winding 31. When the auxiliary switch means 3 is rendered conductive by an auxiliary winding 4 when the main switch means 9 is cut off, the auxiliary switch means 3 first effects third-quadrant operation to charge the snubber capacitor 7 with energy stored in a leakage inductance of the primary winding 31, and then effects first-quadrant operation to discharge the snubber capacitor 7 to cause a current to flow through the primary winding 31. The current transfers the energy to the secondary winding 32 or charges a smoothing capacitor 21 on the primary side to transfer the energy to a rectifying and smoothing means 18 on the primary side. Since no surge voltage is applied to the main switch means 9 and the energy stored in the leakage inductance is not wasted, the RCC-type switching power supply 2a.about.2c produces low noise and is highly efficient.

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First Claim