| 摘要 |
A high-voltage transformer drive circuit and a high-voltage transformer drive discharge tubes. In at least one example embodiment, a tube current synthesis/high pass filter circuit synthesizes tube currents in the discharge tubes, and extracts a pulse component resulting from arc discharge from the synthesis tube current. A pulse hold circuit holds the extracted pulse component for a predetermined time. A comparator compares an output from the pulse hold circuit with a threshold value, and outputs a signal indicating the presence or absence of the arc discharge. Upon detection of the arc discharge, a logic circuit stops the operation of the high-voltage transformer drive circuit. Thus, arc discharge is detected with high accuracy at low cost.
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