Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter
Patent
1989-03-06
1990-04-03
Wong, Peter S.
Electric power conversion systems
Current conversion
Including d.c.-a.c.-d.c. converter
363 56, 363 98, 363132, 363 49, 315DIG7, H02M 3335
Patent
active
049145584
ABSTRACT:
The method of starting fluorescent lamps includes energizing the lamp and its filaments, in a cold condition, with voltages and currents considerably in excess of (and integer multiples of) normal operating parameters. This high power is supplied for either a predetermined time (on the other of 100 milliseconds) or until lamp starting is sensed. The power conditioning electronics improves the power factor by using normal inverter current to charge a capacitor so that, as full wave rectified voltage from a bridge falls, current can be supplied to the inverter from the charged capacitor. The full wave bridge rectifier includes two diodes and two silicon controlled rectifiers, the latter energized by secondary windings of a transformer which carries current under normal inverter operating conditions. In the event that operating parameters of the inverter exceed a threshold, however, current through the primary of the transformer is shunted away, thus removing the triggering current from the SCRs. The SCRs as a result open circuit the bridge and as a consequence power is removed from the inverter to provide for shock protection. Manufacturability of the power conditioning electronics is improved by using a single saturable core to control the conduction duration of the switches in the inverter. The control arrangement inhibits conduction of a non-conducting one of the switches until the voltage in the series resonant circuit peaks.
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