Patent ID: 8334685

Claim:
A signal detector, adapted for a voltage signal detecting environment, comprising: an analog-to-digital converter (ADC) module, receiving a signal inputted to the signal detector and converting the signal inputted to the signal detector into a digital signal; a zero point module, receiving a low voltage square wave signal and generating a zero point control signal; a voltage detection module, receiving the digital signal from the ADC module and the zero point control signal from the zero point module, and determining whether a voltage of the signal inputted to the signal detector is abnormal according to the zero point control signal and the digital signal; a frequency detection module, receiving the zero point control signal and determining a frequency and/or a zero point and/or a phase of the signal inputted to the signal detector according to the zero point control signal; and a register module, saving variable factors received from the voltage detection module and/or the frequency detection module, for adjusting the setting of the signal detector.