Inverter-type ballast with ground-fault protection

摘要: With most fluorescent lighting fixtures, the voltages required at sockets to start lamps are so high as potentially constitute a substantial electric shock hazard persons having service such fixtures. To mitigate this hazard, whenever socket exceed certain levels, protective measures have be provided. The essential problem associated with fixture relates situation where person, who may in contact earth ground, is holding onto one end of lamp while other inserted into its socket. In preferred embodiment, subject invention constitutes an electronic ballasting means for lamps, said comprising inverter operating frequency about 33 kHz. ballast output voltages, arrangements been provided by which just small current flowing directly from terminals ground will operate shut off.