| 摘要 |
The circuit has a charging and discharging device for applying a system power supply voltage to charge the system with a constant voltage upon activation of the system and for discharging the charged voltage upon deactivation of the system. A switching device forms an open circuit between a high voltage unit of the cathode ray tube and a ground upon the activation of the system and forms a closed circuit between the high voltage unit and the ground in response to the discharge of the charged voltage upon the deactivation of the system to discharge the residual high voltage in the cathode ray tube. The charged voltage acts as a drive voltage to form the closed circuit.
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