| 主权项 |
1. An insulation type switching power source apparatus comprising:
a transformer that insulates a primary circuit system and a secondary circuit system from each other and uses a primary winding and a secondary winding to transform an input voltage into an output voltage, a switching control device that is disposed in the primary circuit system to drive the primary winding, and an output monitor device that is disposed in the secondary circuit system to monitor the output voltage, wherein the transformer includes a first auxiliary winding disposed in the primary circuit system and a second auxiliary winding disposed in the secondary circuit system besides the primary winding and the secondary winding, the output monitor device drives the second auxiliary winding to generate an induced voltage in the first auxiliary winding when the output voltage becomes smaller than a predetermined threshold value voltage, and the switching control device temporarily stops driving of the first winding upon detecting a light load state and resumes the driving of the first winding upon detecting the induced voltage in the first auxiliary winding. |
