Patent ID: 8102124

Claim:
An inverter circuit, configured for driving a light source module, comprising: an input signal circuit that provides electrical signals; a power stage circuit connected to the input signal circuit, the power stage circuit configured for converting the electrical signals into square-wave signals; a transformer circuit connected between the power stage circuit and the light source module, the transformer circuit configured for converting the square-wave signals into alternating current (AC) signals capable of driving the light source module; a voltage detection circuit electrically connected to the transformer circuit, the voltage detection circuit configured for detecting voltage applied to the light source module and outputting a detected voltage signal according to the detected voltage; a feedback circuit connected to the light source module, the feedback circuit configured for feeding current flowing through the light source module to output a current feedback signal; a protection circuit electrically connected to the voltage detection circuit and the feedback circuit, the protection circuit configured for outputting a latch signal according to the detected voltage signal or the current feedback signal; and a pulse-width modulation (PWM) control circuit connected to the power stage circuit and the protection circuit, the PWM control circuit configured for outputting a switch signal to control the power stage circuit to stop converting the electrical signals into the square-wave signals upon receiving the latch signal; wherein the protection circuit further receives the electrical signals from the input signal circuit, and in response to the output of the input signal circuit being cut off, the protection circuit does not receive the electrical signals, no latch signal is output to the PWM control circuit, and no switch signal is output from the PWM control circuit to the power stage circuit, and the power stage circuit restarts to convert the electrical signals to the square-wave signals.