Two stage isolated switch-mode ac/dc converter
OwnerSheng Yeinventor
Life of this patent
Estimating the term…
Abstract
An AC/DC two stage converter includes a non-isolated switch-mode regulated AC/DC voltage step-down first stage converter comprising an AC input and a first DC output. The AC voltage applied to the AC input is rectified and switch-mode regulated to a first DC voltage at the first DC output. The first DC voltage is lower than a peak voltage of the AC voltage applied to the AC input. An isolated switch-mode regulated DC/DC second stage converter includes a second DC input coupled to the first DC output and at least one second DC output, wherein the first DC voltage is switch-mode regulated to a second DC voltage at a second DC output.
Claims19
An AC/DC two stage converter comprising:
- a non-isolated switch-mode regulated AC/DC voltage step-down first stage converter comprising an AC input and a first DC output, wherein an AC voltage applied to the AC input is rectified and switch-mode regulated to a first DC voltage at the first DC output, and the first DC voltage is lower than a peak voltage of the AC voltage applied to the AC input, and
- an isolated switch-mode regulated DC/DC second stage converter comprising a second DC input coupled to the first DC output and at least one second DC output, wherein the first DC voltage is switch-mode regulated to a second DC voltage at a second DC output.
A method of operating an AC/DC two stage converter comprising:
- in a non-isolated first stage, rectifying an AC voltage at an AC input of the converter to a rectified voltage, and switch-mode regulating the rectified voltage to a first DC voltage lower than a peak AC voltage of the AC input to the converter, wherein the rectified voltage and the first DC voltage share a common voltage ground, and
- in an isolated second stage, switch-mode regulating the first DC voltage to a DC voltage at a second DC output of the converter, while isolating the DC output from the AC input.
Dependencies are inferred from the claim text.