| 摘要 |
An energizing circuit for gas discharge lamps for room or street lighting or for lights used in document copying machines and the like comprises means for continuously energizing the same at a low non-useful light producing level when such lamps are not needed by a voltage which strikes an arc and maintains a low level of ionization with an infinitesimally small current and very little energy drain. This voltage may be an AC voltage or a DC voltage supplied by a unique circuit including a number of DC voltage sources, rectifiers, voltage adjusting and current-limiting impedances and electronic switches. The lamps are energized by AC or pulsating DC supplied by the aforesaid or other electronic switches operated at a high frequency of at least about 20-30 kilo-Hertz. When pulsating DC is utilized and the switches are rendered conductive, back-biasing voltages are applied to rectifiers which disconnect one of the voltage sources and re-connect the same or another voltage source to a different terminal of the lamps which causes an increase in the current flow in the lamps, resulting in a high degree of ionization to cause the lamps to emit substantial light. High operating lamp efficiency is achieved by modulating the electronic switches at said high frequency rate and de-energizing all heater windings during normal lamp energization.
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