Improved power supply circuit for a gaseous discharge tube device.

摘要

An improved power supply circuit for supplying power to intermittently energized loads, such as gaseous discharge tube devices. Such power supply has a transformer (22) wherein current flow in the primary winding (23) is controlled by a first semiconductor device (36) that in turn is controlled by a second semiconductor device (35). A feedback circuit (46) coupled to the primary winding provides a signal for turn-off of the first semiconductor device (36) when its turn-off is initiated by the second semiconductor device (35). A circuit portion (65,66) connected between the primary winding (23) and the second semiconductor device (35) provides a signal to the second semiconductor device (35) when it initiates a turn-off of the first semiconductor device (36). Such signal continues operation of the second semiconductor device (35) until the turn-off signal from the feedback circuit (46) is effective to turn-off the first semiconductor device (36) serving to reduce power dissipated in the first semiconductor device (36).