Energy saving device for a standard fluorescent lamp system
There is provided in combination with a rapid-start series-sequence type ballast for two low-pressure mercury discharge lamps, apparatus for reducing the power consumption of both lamps. The apparatus utilizes switch means in conjunction with a capacitor to limit the current supply to the lamps after the lamps are energized. The switch means has two members in series circuit arrangement with one of the electrodes of one of the lamps. Each member is connected on opposite sides of the electrode. The capacitor is connected in parallel circuit arrangement with one of the members. Initially upon energization the switch means has a low impedance state to permit current flow and then switches to a high impedance state. The switch means permits preheating of the electrode and thereafter upon response to current flow switches and causes the lamp current to pass through the capacitor and thereby decrease by a predetermined amount the current through the normally operating lamps. The switch means may comprise switch members having a positive temperature coefficient of electrical resistance.
- Assignee:
- Westinghouse Electric Corp.
- Patent Number(s):
- US 4082981
- OSTI ID:
- 5008623
- Resource Relation:
- Patent File Date: Filed date 28 Feb 1977
- Country of Publication:
- United States
- Language:
- English
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