| 摘要 |
A method and apparatus are provided for improved noise reduction from switching on and off drain pumps ( 202 ) in a high voltage generator. The drain pumps ( 202 ) are divided into groups ( 204 ) and activation of the groups ( 204 ) of drain pumps ( 202 ) is staggered ( 304, 310 ). In addition, when drain pumps are switched on and off for power conservation or to maintain a steady state high voltage level, the groups ( 204 ) of drain pumps ( 202 ) are switched on and off in response to various predetermined high voltage levels ( 410, 412, 414, 416 ), with different voltage levels for different groups ( 204 ) of drain pumps ( 202 ).
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