| 摘要 |
A power source control chip which is a high voltage controlling portion is added to an ASIC for sequence control constituting a sequence control unit. A PWM signal is sent from the high voltage controlling portion to a high voltage producing portion constituting a high voltage unit, and an output detection signal is sent from the high voltage producing portion to the high voltage controlling portion, thereby effecting feedback control. At that time, a modulated wave PWM/detection signal amplitude-modulated with the PWM signal as a carrier wave and with the output detection signal as a modulating wave is produced and is transmitted onto a signal line, whereby the number of signal lines can be decreased.
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