| 摘要 |
The invertor circuit for gas-discharge lamps (G) operates at high frequencies and with low-loss tuned circuits. In order to prevent the electrical variables (voltage-current) rising too rapidly and too high as a result of the low-loss tuned circuits when the gas-discharge lamp (G) is defective, a resistor (R1) and a controllable semiconductor valve (T1) are provided between the mains voltage lines (V+ - V-). The semiconductor valve (T1) is controlled by an electrical variable which increases if the lamp (G) is defective. A diode (D2) which is connected between the semiconductor valve (T1) and the resistor (R1) is electrically, effectively connected to the invertor (W) and switches the latter off as soon as the semiconductor valve (T1) has been activated by the rising electrical variable. <IMAGE>
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