×

System for preventing oscillations in a fluorescent lamp ballast

  • US 6,111,368 A
  • Filed: 09/26/1997
  • Issued: 08/29/2000
  • Est. Priority Date: 09/26/1997
  • Status: Expired due to Term
First Claim
Patent Images

1. A ballast for providing power to a fluorescent lamp from a substantially sinusoidal source of input power having variable conduction and non-conduction periods, the ballast comprising:

  • a power stage for converting the input power to drive the fluorescent lamp;

    a control circuit for controlling the power stage as a function of the variable conduction and non-conduction periods;

    a control circuit power supply operable to draw power from the input power source and provide control power to the control circuit; and

    a monitor and enabling circuit which permits the ballast to deliver power to the lamp only when characteristics of the input power source meet predetermined criteria.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×