Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Impedance or current regulator in the supply circuit
Patent
1991-08-23
1992-12-15
Laroche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Impedance or current regulator in the supply circuit
315DIG4, 315274, 315DIG7, 363132, H05B 3702, H05B 4116, H02M 75387
Patent
active
051720337
ABSTRACT:
A circuit arrangement for operating a discharge lamp includes a DC-AC converter provided with a branch A having at least one switching element alternately conductive and non-conductive for generating a current of alternating polarity at a frequency f. A load branch B is coupled to the branch A and is provided with lamp connection terminals and with inductive means. A drive circuit E renders the switching element conducting and non-conducting at a frequency f. The drive circuit is provided with a branch D which includes a series circuit of further inductive means and capacitive means, and with a branch C including a variable impedance. The drive circuit is coupled to the inductive means in the load branch B, the branch D is coupled to the switching element in branch A, and the branch C is coupled to the further inductive means in branch D. Branch C also includes inductive means and the variable impedance is a variable resistor. The lamp thus can be dimmed over a wide range by a simple and inexpensive circuit.
REFERENCES:
patent: 2982881 (1961-05-01), Reich
patent: 3389299 (1968-06-01), Bell
patent: 4017785 (1977-04-01), Perper
patent: 4553070 (1985-11-01), Sairanen et al.
patent: 4712045 (1987-12-01), Van Meurs
patent: 4935672 (1990-06-01), Lammers et al.
patent: 4983887 (1991-01-01), Nilssen
patent: 5036253 (1991-07-01), Nilssen
patent: 5084653 (1992-01-01), Nilssen
Blocker Edward
LaRoche Eugene R.
Shingleton Michael B.
U. S. Philips Corporation
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