Title: Service life prolonged lamp bulb
Application Number: 87102617 Application Date: 1987.04.05
Publication Number: 1021607 Publication Date: 1988.10.19
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H01K1/62,H05B39/00
Applicant(s) Name: Qu Xisheng Address:
Inventor(s) Name:
Attorney & Agent:
Abstract:
     The present invention provides a kind of DC filament lamp bulb and the circuit of DC filament lamp bulb, both of which are used in DC circuit. For prolonging the service life of the lamp bulb, a rectification device is adopted to supply the lamp bulb with DC current. The parallel method of double pieces or double sets of filament is adopted so as to maintain the lamp filament temperature, reduce the heat power consumption and raise the luminous efficiency. By utilizing the circuit of DC filament lamp bulb, the ordinary filament lamp bulb can be used. In order to ensure the filament lamp bulb working in a optimal state, filtering capacitor is used in the filament lamp bulb and the circuit of the filament lamp bulb.
Time: 13
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