| 摘要 |
A power converter comprising: a rectifier arrangement (D 1 -D 4 ) having inputs coupled to AC power supply terminals; a pair of series-connected capacitors (C 1 , C 2 ) coupled across output terminals of the rectifier arrangement; a switch (S 1 ) coupled between one of said AC power supply terminals and a midpoint of the pair of series-connected capacitors, the switch being open if a first AC voltage is applied to the AC power terminals, and the switch being closed if a second AC voltage is applied to the AC power terminals, the first AC voltage exceeding the second AC voltage; and an overvoltage protection circuit (D 5 , R 30 , D 6 ) coupled between at least one of the inputs of the rectifier arrangement and the midpoint of the pair of series-connected capacitors.
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