发明授权
- 专利标题： High voltage power supply device for lighting discharge tube having protection circuit and fault protection circuit
- 专利标题（中）： 具有保护电路和故障保护电路的照明放电管高压电源装置
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申请号： US09923987申请日： 2001-08-07
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公开(公告)号： US06654221B2公开(公告)日： 2003-11-25
- 发明人: Takashi Noma , Yasuyuki Morishima
- 申请人： Takashi Noma , Yasuyuki Morishima
- 优先权： JP2000-246234 20000815
- 主分类号： H02H904
- IPC分类号： H02H904
摘要：
Current flowing through a cold cathode tube is detected and converted to a voltage with a resistor, and is fed to a tube current control circuit. The tube current control circuit drives a drive circuit to control a voltage applied to a piezoelectric transformer. Current from a constant-current source is used to charge a fault protection capacitor. A transistor is allowed to conduct while current flows through the cold cathode tube so that a voltage is developed in a resistor, and thereby, an electric charge is prevented from being stored in the fault protection capacitor, thereby stopping the operation of a fault protection circuit.