Patent ID: 7965047

Claim:
A fluorescent lamp driving circuit, comprising: a resonant module, with a primary side and a secondary side, used to convert an input voltage received on the primary side into an AC signal outputted on the secondary side, the resonant module having a transformer, and a primary side of the transformer having two connection ends and a central tap end; a lamp module, which has a plurality of lamps, coupled to the secondary side of the resonant module to receive the AC signal; a detection device, wherein the detection device and the lamp module are serially connected to the secondary side of the resonant module, having one end thereof connected to a reference potential end, and generating a current detection signal and a protection feedback signal based on the current flowing through the plurality of lamps; and a controller, having two semiconductor switches, one end of each of the two semiconductor switches being mutually connected, the other end of each of the two semiconductor switches being coupled to the two connection ends of the primary side of the transformer, respectively; wherein the controller controls the switching of the two semiconductor switches in accordance with the current detection signal to stably transfer power of the input voltage to the resonant module, when the protection feedback signal is higher than a first preset value or lower than a second preset value, the controller stops the switching of the two semiconductor switches, and the first preset value is greater than the second preset value.