Circuit arrangement

Details Circuit arrangement Circuit arrangement

1990-11-16

1991-12-24

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Impedance or current regulator in the supply circuit

315209R, 315307, 315DIG7, H05B 4136

Patent

active

050755994

ABSTRACT:
The invention relates to a circuit arrangement for operating a discharge lamp, comprising a DC-AC converter provided with a switching element for generating a current whose polarity changes with a frequency f, a current sensor (SE), a drive circuit (III) for generating a drive signal to make the switching elements alternately conducting with the frequency f, a measuring circuit (I) coupled to the current sensor and having at least one switching element for generating a control signal which is dependent on a phase difference between a voltage across the load circuit B and a current through the load circuit B and on a second signal which is a measure for a minimum required phase difference, and a control circuit (II) for effecting a change in an operating condition of the DC-AC converter, this change being dependent on the control signal.

REFERENCES:
patent: 4887007 (1989-12-01), Almering et al.
patent: 4949016 (1990-08-01), De Bijl et al.
patent: 4965493 (1990-10-01), Van Neurs et al.

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