| 摘要 |
<p>A voltage multiplier control circuit 13 comprises a voltage level detector 19, 21 for detecting the operating voltage range of an AC supply 5; a signal generator for generating a control signal to identify the detected operating voltage range; and a switch control module 25 for enabling and/or disabling a voltage multiplier 17 in response to said control signal. The voltage level detector may comprise first 19 and second 21 detectors, both for detecting the operating voltage range of the AC supply and generating first and second control signals respectively. The switch control module may be configured to enable and/or disable the voltage multiplier only when the first and second control signals both identify the same voltage range. The first and second detectors may be operable independently of each other, and may optionally detect the operating voltage range simultaneously. The invention has particular application for controlling a voltage converter in a power supply for a vacuum pump.</p> |
