Title: Ballast circuit
Application Number: 00802715 Application Date: 2000.11.09
Publication Number: 1337143 Publication Date: 2002.02.20
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: H05B41/298;H05B41/392
Applicant(s) Name: Koninklijke Philips Electronics N.V. Address:
Inventor(s) Name: L.F.J. Oostvogels;L. Vos;A.V. Gavas
Attorney & Agent: wang yue
Abstract:
    In a TRIAC dimmable ballast for a discharge lamp comprising a buffer capacitor and a control circuit, a shut off circuit is incorporated for switching off the control circuit when the voltage over the buffer capacitor drops below a predetermined value due to a high phase angle adjusted in the TRIAC dimmer.
Time: 29