Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1986-04-17
1988-04-19
Moore, David K.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315209R, 315246, 315307, 315287, 315225, 315127, 315 82, 361111, 361 98, 361101, 361 71, 361 79, 307 10LS, H05B 3904, H02H 320, H02H 326
Patent
active
047392266
ABSTRACT:
A dimming circuit adjusts the light output of a lamp by controlling the current flow in the lamp that is connected to a transistor, through turning on and off the transistor with a predetermined timing which is changed by the control signal from a control signal generating circuit. The dimming circuit has a protective circuit for applying an off-state command signal to switch the transistor to the off-state by detecting an excess current flowing in the transistor when an input signal is applied as a control signal for switching the transistor to the on-state.
REFERENCES:
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patent: 3889159 (1975-06-01), Wessel
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patent: 4430684 (1984-02-01), Lefebvre et al.
patent: 4525765 (1985-06-01), Bradjer
patent: 4593233 (1986-06-01), Taylor et al.
Moore David K.
Powell Mark R.
Yazaki -Corporation
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