ELECTRONIC BALLAST PROTECTION CIRCUIT

摘要

A protective circuit of electronic ballast is provided to protect electronic ballast by detecting abnormality of an electroless fluorescent lamp based on a voltage applied to both ends of the electroless fluorescent lamp. A protective circuit(300) of electronic ballast includes a lamp voltage detecting part(310), an inverter driving control part(320), and a circuit separating part(330). The lamp voltage detecting part detects a voltage supplied to an electroless fluorescent lamp. The inverter driving control part controls the inverter according to an analyzed result of the voltage detected by the lamp voltage detecting part. The circuit separating part is arranged between the lamp voltage detecting part and the inverter driving control part. The circuit separating part separates the inverter driving control part from the lamp voltage detecting part in order to protect the inverter driving control part from a surge generated in the lamp voltage detecting part.