CIRCUIT ARRANGEMENT

摘要

A ballast circuit receiving power from the mains and supplying a high frequency lamp current to a lamp is equipped with means to generate both a common mode current and a differential mode current through the mains supply terminals. Both these currents are phase shifted 180 degrees with respect to the lamp current. In this way currents induced in the mains supply terminals by means of parasitic capacitive coupling and magnetic coupling between conductors carrying the lamp current and the mains supply terminals are cancelled.