Discharge lamp lighting device having level shift control functi

Details Discharge lamp lighting device having level shift control functi Discharge lamp lighting device having level shift control functi

1990-09-26

1992-03-17

LaRoche, Eugene R.

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315224, 315DIG4, H05B 3702

Patent

active

050971816

ABSTRACT:
A discharge lamp lighting device includes a pair of main switching transistors and a feedback transformer. Each of the main switching transistors has a control electrode to form a push-pull circuit and which is switched on and off responsive to a given oscillating frequency. The feedback transformer has a pair of drive windings and serves to positively feed back the output of the push-pull circuit to each of the control electrodes of the paired main switching transistors. A first control circuit is connected to each of the bases of the main switching transistors and includes a variable impedance element to control the oscillating frequency by varying the impedance of this variable impedance element. A second control circuit has a level shift circuit and serves to control the level of signal applied to the first control circuit so as to change the impedance of the variable impedance element so that the on-off operation of each of the paired main switching transistors can be controlled.

REFERENCES:
patent: 4641065 (1987-02-01), Munson
patent: 4684850 (1987-08-01), Stevens
patent: 4709189 (1987-11-01), Kuchii
patent: 4862041 (1989-08-01), Hirschmann
patent: 4933605 (1990-06-01), Quazi
patent: 4935669 (1990-06-01), Nilssen

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