| 摘要 |
The present invention relates to an AC/DC converter ( 1 ) of the type having an AC/DC conversion stage ( 2 ) and a DC/DC conversion stage ( 3 ), the AC/DC conversion stage ( 2 ) comprising an input filter stage ( 4 ), an input rectifier stage ( 5 ) and a tracking boost converter stage. The boost converter stage in turn comprises an input choke ( 10 ), a boost diode ( 16 ) and a bulk capacitor ( 17 ). The bulk capacitor ( 17 ) is arranged to store a range of voltages substantially proportional to the input voltage of the converter. The DC/DC stage ( 3 ) is arranged to receive the range of voltages from the bulk capacitor ( 17 ) and is controllable to provide a desired DC output regardless of the voltage received from the bulk capacitor ( 17 ). This is achieved through careful combination of components and use of output feedback control to control the voltage applied to an isolated transformer ( 41 ) in the DC/DC stage.
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