AC-DC resonant converter that provides high efficiency and high power density

A power supply, comprising:

• an AC power connector;
• and
• an AC/DC power converter coupled to the AC power connector and configured to convert an AC input voltage to a DC output voltage;
• wherein the AC/DC power converter further comprises:
• an input rectifier stage which rectifies an AC input voltage into a first rectified voltage of a first constant polarity and a first amplitude;
• a switching resonant stage directly coupled to the output of the input rectifier stage, wherein the switching resonant stage comprises:
• a switching stage comprising one or more switches, wherein the switching frequency of the one or more switches varies as a function of the AC input voltage;
• and
• a resonant stage, which is coupled to the output of the switching stage that converts the switching stage's output voltage into a second rectified voltage of a second constant polarity and a second amplitude;
• and
• an output rectifier stage coupled to the output of the switching resonant stage, wherein the output rectifier stage rectifies the second rectified voltage into a DC voltage output.

A system that converts an AC input voltage into a DC output voltage, comprising:

• an input rectifier stage which rectifies an AC input voltage into a first rectified voltage of a first constant polarity and a first amplitude;
• a switching resonant stage directly coupled to the output of the input rectifier stage, wherein the switching resonant stage comprises:
• a switching stage comprising one or more switches, wherein the switching frequency of the one or more switches varies as a function of the AC input voltage;
• and
• a resonant stage, which is coupled to the output of the switching stage that converts the switching stage's output voltage into a second rectified voltage of a second constant polarity and a second amplitude;
• and
• an output rectifier stage coupled to the output of the switching resonant stage, wherein the output rectifier stage rectifies the second rectified voltage into a DC voltage output.