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(11) | EP 1 565 042 A3 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Electronic ballast for fluorescent lamp using silicon-controlled phase-luminosity modulator for adjusting luminosity |
| (57) The present invention relates to an electr onic ballast of a fluorescent lamp using
a silicon-controlled phase-luminosity modulator for adjusting luminosity. The ballast
comprises: (a) a filter and rectification circuit having an output port and connected
to a municipal alternating current power supply; (b) a frequency-control and switch
circuit having an output port; including an integrated circuit (IC) for controlling
frequency and producing switch -triggering signals; (c) an output circuit, having
an input port connected to the output port of the frequency -control and switch circuit;
(d) light -modulating signal processing circuit, connected to the output port of filter
and rectification circuit and the input port of frequency control and switch circuit;
(e) direct -current high voltage stabilization circuit, with an input port connected
to the output port of filter and rectification circuit, an output port connected to
the input port of frequency control and switch circuit, and feedback port connected
with the output circuit. This electronic ballast requires only three simple circuits
and few components. Thus, it can be manufactured at a lower cost with a smaller dimension.
With its stable capacity of light modulating, the ballast of the present invention
can be applied easily and widely, especially in the integrated and compact fluorescent
lamps.
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