Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Plural load device systems
Patent
1985-05-17
1989-12-19
Griffin, Robert L.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Plural load device systems
315210, 315224, 315DIG7, 363172, H05B 4136
Patent
active
048885258
ABSTRACT:
A sun tanning apparatus has an electronic operating system comprising: (i) a plurality of pairs of fluorescent lamps for providing tanning radiation, each pair of lamps being adapted to be powered from 30 kHz/120 Volt by way of a high-Q series-resonant L-C ballasting circuit; (ii) a relatively low-power frequency converter connected with the power line and operable to provide power for heating the cathodes in these fluorescent lamps, thereby conditioning the lamps for easy starting; (iii) a relatively high-power frequency converter also connected with a power line and operable to provide the 30 kHz/120 Volt required for operating the plurality of pairs of fluorescent lamps by way of the high-Q series-resonant L-C ballasting circuit; and (iv) delay means operable to prevent the 30 kHz/120 Volt provided by the high-power frequency converter from being applied to the fluorescent lamps until after power has been applied to heat the lamp cathodes for at least one second. Each high-Q series-resonant L-C ballast circuit is protected from over-voltages by a Varistor, which acts as a substitute load in case a lamp is removed or fails to operate properly. If current should flow through one of the Varistors for more than a few milli-seconds, the high-power frequency converter is disabled, thereby removing the 30 kHz/120 Volt.
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Griffin Robert L.
Salindong T.
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