Charge recovery for enhanced transistor drive

摘要

A control circuit for an electro luminescent display in which a flyback converter and an H-bridge are used to provide a high voltage alternating current to a capacitive load from a low voltage DC source. Each time the polarity of the capacitive load is reversed, the capacitive load discharges. This high voltage discharge is stored on a low voltage capacitor and subsequently used as an auxiliary power supply to power the switching elements of the control circuit.