Power supply device with high output stability

Abstract

A power supply device with high output stability includes a switch circuit, a transformer, a first capacitor, an output stage circuit, and a detection and control circuit. The switch circuit generates a switching voltage according to an input voltage, a first driving voltage, and a second driving voltage. The transformer includes a main coil, a first secondary coil, and a second secondary coil. The output stage circuit is coupled to the first secondary coil and the second secondary coil, and is configured to generate a first internal voltage, a second internal voltage, and an output voltage. The detection and control circuit generates the first driving voltage and the second driving voltage. The detection and control circuit also adjusts the first driving voltage and the second driving voltage according to the first internal voltage and the second internal voltage, thereby balancing the switch circuit.

Images