Patent ID: 8243472
Filing Date: 2012-08-14
Classification: H02M

Abstract:
1. A power supply having a two-way DC to DC converter comprising: an AC to DC converter having: a two-way DC to DC converter having: wherein when the control module determines that the AC to DC converter outputs the middle level DC power, the control module treats the first electronic switch as an active switch, obtains the first feedback voltage, and adjusts a turn-on period of the first electronic switch to maintain the low level DC power stably output from the second I/O terminal of the two-way DC to DC converter based on the first feedback voltage so the two-way DC to DC converter operates as a buck converter; wherein when the control module determines that the AC to DC converter does not output the middle level DC power and the second I/O terminal of the two-way DC to DC converter obtains an external DC power, the control module treats the second electronic switch as an active switch, obtains the second feedback voltage, and adjusts a turn-on period of the second electronic switch to maintain the middle level DC power stably output from the first I/O terminal of the two-way DC to DC converter based on the second feedback voltage so the two-way DC to DC converter operates as a boost converter; and wherein the feedback selector assists the dual output PWM controller in obtaining either the first feedback voltage or the second feedback voltage based on whether the AC to DC converter outputs the middle level DC power.