The high voltage output of the inverter forms the circuit

The high voltage output of the inverter forms the circuit

The high-voltage output forming circuit is composed of dual transistor Q4, step-up transformer Tl, capacitor C3 and other components. This is a typical transformer-
coupled self-excited oscillation circuit. The circle shows the high-voltage output forming circuit of the inverter .
    The circuit relies on the correct connection of the same terminals of the primary and secondary windings of the transformer to meet the phase conditions of self-excited oscillation, that is, to meet the positive feedback conditions. To satisfy the amplitude condition, firstly, the circuit
parameters should be reasonably selected so that the amplifier can establish a suitable static operating point. Secondly, the number of turns to increase the coupling degree between it and the primary winding to obtain sufficiently strong feedback. quantity. The amplitude stabilization effect is achieved by utilizing the nonlinearity of the transistor . The high voltage induced by the secondary winding of Tl supplies power to the backlight through c5, C6 and connector CN2.