Electronic ballast with FET bridge inverter

Details Electronic ballast with FET bridge inverter Electronic ballast with FET bridge inverter

1994-10-28

1996-01-02

Mis, David

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

315210, 315224, 315226, 315307, 315DIG5, H05B 4129, H05B 4136

Patent

active

054811600

ABSTRACT:
Controlled DC supply voltage is provided to a self-oscillating FET bridge inverter ballast from a pre-converter and by way of an inductor having two separate windings on a common magnetic core--with one winding being positioned in each leg of the DC supply. The inverter is loaded by way of a parallel-tuned L-C circuit connected across the bridge inverter's output, thereby providing a special AC output voltage thereat. This special AC output voltage is characterized in that it exhibits an unusually high rate of voltage change at its cross-over points but otherwise has a substantially sinusoidal waveshape. An instant-start fluorescent lamp is connected via a current-limiting capacitor across the bridge inverter's output. The magnitude of the DC supply voltage is so chosen as to cause the magnitude of the AC output voltage to be such as to effectuate proper instant-starting of the fluorescent lamp. Because the AC output voltage is balanced with respect to ground, U.L. requirements are met without the need for an isolation transformer. Each of the four FET's is driven by providing a sinusoidal AC voltage directly from a positive feedback winding on the tank-inductor of the L-C circuit.

REFERENCES:
patent: 4692667 (1987-09-01), Nilssen

Affiliated with

Also associated with

Rating

Electronic ballast with FET bridge inverter does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electronic ballast with FET bridge inverter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electronic ballast with FET bridge inverter will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-237644