Discharge lamp lighting circuit

摘要

In a lighting circuit, a lighting control circuit of a discharge lamp and a starting circuit for supplying a starting pulse to the discharge lamp are provided and also, electric power and the starting pulse are supplied through a socket connected to the discharge lamp. The starting circuit provided within the socket has a transformer, a capacitor connected to a primary winding of the transformer and a self-breakdown type switch element. It is constructed so that a feeding path to the capacitor is formed to charge the capacitor only when the discharge lamp is connected to the socket and a connection between a first terminal and a third terminal is made.