Patent ID: 9608538
Date: 2017-03-28
CPC Classifications: H02M

Claim:
1. A common zero volt reference AC/DC power supply with positive and negative rectification, comprising: an input for receiving an alternating current (AC) input voltage; an output for outputting a direct current (DC) output voltage, the AC input voltage and the DC output voltage having a common zero volt reference; a first rectification circuit for performing a half-wave rectification of a positive half cycle of the AC input voltage into a first rectified DC voltage; a second rectification circuit for performing a half-wave rectification of a negative half cycle of the AC input voltage into a second rectified DC voltage; control logic for detecting if the AC input voltage is in the negative half cycle, activating the second rectification circuit when the AC input voltage is in the negative half cycle by allowing current to circulate in the second rectification circuit, and de-activating the second rectification circuit when the AC input voltage is not in the negative half cycle by preventing current to circulate in the second rectification circuit; a DC/DC power converter for converting the first rectified DC voltage and the second rectified DC voltage received respectively from the first and second rectification circuits into the DC output voltage.