Patent ID: 8035608

Claim:
An inverter circuit for driving a lamp, comprising: a switching unit, having a first current terminal, a second current terminal and a control terminal, the control terminal receiving a pulse width modulation signal for controlling the conductivity of the switching unit; a first capacitor, parallel connected to the first current terminal and the second current terminal of the switching unit; a transformer, having a primary winding coupled to a first voltage and the first current terminal of the switching unit and a secondary winding coupled to a second voltage and a lamp for providing a driving signal with alternating current to the lamp; a signal generation module, for generating the pulse width modulation signal according to the first voltage, wherein a duty cycle of the pulse width modulation signal is determined by a feedback signal according to the lamp and a sensed signal; and a first detecting module, directly connected to the second current terminal of the switching unit and the signal generation module for generating the sensed signal according to the flowing current of the switching unit.