SWITCHING POWER SUPPLY AND IMPROVEMENTS THEREOF

摘要

The present invention is directed toward a switching power supply and improvements thereof. In accordance with an embodiment, a switching power supply is provided. The switching power supply comprises: a first power supply stage that forms an intermediate regulated voltage; and a second power supply stage configured to accept the intermediate regulated voltage and configured to form a regulated output voltage, wherein the first power supply stage monitors an error signal that is representative of a difference between the intermediate regulated voltage and a desired level for the intermediate regulated voltage to detect a light load condition and wherein the first power supply stage enters a first power-saving mode when the error signal falls below a first threshold, a switching frequency in the first power supply stage being reduced in the first power-saving mode, and wherein the first power supply stage enters a second power-saving mode when the error signal falls below a second threshold, switching in the first power supply stage being performed in bursts in the second power-saving mode.

主权项

1. A switching power supply comprising:
a first power supply stage that forms an intermediate regulated voltage; and a second power supply stage configured to accept the intermediate regulated voltage and configured to form a regulated output voltage, wherein the first power supply stage monitors an error signal that is representative of a difference between the intermediate regulated voltage and a desired level for the intermediate regulated voltage to detect a light load condition and wherein the first power supply stage enters a first power-saving mode when the error signal falls below a first threshold, a switching frequency in the first power supply stage being reduced in the first power-saving mode, and wherein the first power supply stage enters a second power-saving mode when the error signal falls below a second threshold, switching in the first power supply stage being performed in bursts in the second power-saving mode.