Patent ID: 6813720
Filing Date: 2004-11-02
Classification: H02M,H05B,Y02B

Abstract:
A method of supplying power to a load via a power modulation system including at least one controlled switch adapted to operate in either of two operating modes, namely a â€œreverse phase controlâ€  mode and a â€œforward phase controlâ€  mode, wherein said power modulation system is switched on in said â€œreverse phase controlâ€  mode, said load is supplied with power via said power modulation system, which is commanded to operate under predetermined low-load operating conditions, and then, when said low-load operating conditions are established, overvoltages are detected during a given period and said power modulation system is caused to change to said forward phase control mode if an excessive number of overvoltages is detected during said given period.