| 摘要 |
<p>A capacitor (4), which discharges into a xenon tube (5) that is triggered recurrently by a pulse generator (6), is charged incrementally between triggering, from flyback current within primary and secondary windings (9, 8) of a transformer of the inverter circuit (1). The primary winding (9) is the collector load of a transistor (11) that switches between conduction and non-conduction in dependence upon feedback via a tertiary winding (10) of the transformer. The voltage applied to the base-emitter circuit of the transistor (11) is limited by a Zener diode (18) connected in series with a shunt-connected capacitor (19) and diode (20). The diode (18) conducts in the reverse direction during flyback voltage induced in the winding (10) to discharge the capacitor (19) incrementally for stabilizing the charged voltage of the load capacitor (4) against variation of input DC. A DC-restoration circuit (21-23) supplies base current to the transistor (11) from the tertiary winding (10), and capacitors (24, 25) provide further circuit stabilisation.</p> |
