Electronic starter for fluorescent lamps
OwnerChen-Kuo Kuinventor
Life of this patent
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Abstract
An electronic starter for fluorescent lamp has a preheating circuit for controlling the preheating of the fluorescent tube and a power switch and locking circuit for cutting off the current to the preheating circuit. The power switch and locking circuit makes use of the voltage level on the power input to determine the status of the fluorescent tube. A high voltage on the power input represents that the fluorescent tube has failed to turn on in the ignition operation, whereby the power switch and locking circuit thereupon cuts off the current to the preheat circuit, thereby eliminating flickering of the fluorescent tube and so preventing irritation to the eyes, and extending the service life of the lamp.
Claims4
An electronic starter for fluorescent lamps, the electronic starter comprising:
- a full-wave rectification circuit having a first output terminal arid a second output terminal for converting an incoming AC current to a DC current to be outputted through the first and second output terminals;
- a preheating circuit, herein the DC current is transferred to the preheating circuit that is mainly formed with a MOSFET transistor Q2 having a drain and a gate, wherein the sin of the MOSFET transistor Q2 is connected to the first output terminal of the full-wave rectification circuit for controlling the preheating of the fluorescent tube;
- and
- a power switch arid locking circuit, wherein the power switch and locking circuit is mainly formed with a transistor Q1 having a collector connected to the gate of the MOSFET transistor Q2 for cutting off the preheating circuit;
- wherein the MOSFET transistor Q2 further as a source connected through a resistor R6 and a diode D6 in parallel to the second output terminal of the full-wave rectification circuit, and the gate of the MOSFET transistor Q2 is connected through a resister R4 to the drain of the MOSFET transistor Q2 and then further to the power switch and locking circuit.
Dependencies are inferred from the claim text.