Rapid starter switch for a fluorescent lamp

Details Rapid starter switch for a fluorescent lamp Rapid starter switch for a fluorescent lamp

H - Electricity

05

B

315/38

H05B 41/18 (2006.01) H05B 41/04 (2006.01)

Patent

CA 1149442

Title of the Invention A RAPID STARTER SWITCH FOR A FLUORESCENT LAMP Abstract of the Disclosure An improved starter switch which provides a rapid firing of a fluorescent lamp within 0.8 second has been found. The ex- ternal appearance and the size of the present starter switch are almost the same as those of a prior glow switch. Therefore, the present starter switch may replace a prior glow switch by merely inserting the present starter switch in the socket of the glow switch. The present starter switch has a connector cap which en- gages the socket for the glow switch, a printed circuit board mounting circuit components and connected to the connector cap by lead lines, and a housing fixed to the cap and covering the print- ed circuit board. The circuit elements mounted on the printed circuit board include a non-linear capacitor which has a satura- tion characteristics between a voltage applied to the capacitor and the charge stored in the same, and a semiconductor switch which conducts upon the application of a voltage higher than a predetermined threshold voltage and holds the conductive status until the current in the same reaches almost zero. Following the switching OFF of the semiconductor switch when the source cur- rent is almost zero but the source voltage is almost maximum due to the presence of an inductive ballast, the non-linear capacitor is charged but is saturated in a short time, then, the charge cur- rent of the capacitor is interrupted. The interruption of the charge current of the non-linear capacitor induces a high firing pulse voltage in a ballast inductor which is connected in series with a fluorescent lamp, and this pulse voltage fires the lamp.

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