a method and device for controlling a bridge circuit for providing current or power to a load . the bridge comprises two transistors including flywheel diodes and connected in series between positive and negative power supply rails for conducting current to or from the load under control of a control drive circuit . an lc - circuit is connected between the bridge circuit and the load . the bridge voltage of the connection between the two transistors and the current through the inductance of the lc - circuit are monitored and a firing pulse is supplied to one of the transistors . when the current through the inductance exceeds a preset value , the transistors is turned off , whereupon the current of the inductance continues to flow another way through the flywheel diode of the opposite semiconductor member and consequently the bridge voltage changes polarity a first time to the opposite rail polarity until the magnetic energy of the inductance has been terminated resulting in a second change of polarity of the bridge voltage towards the first rail polarity . the change of the polarity of the bridge voltage towards the first rail polarity is detected and another firing pulse is supplied at or shortly after said change .