Signal converter and method thereof

A signal converter, adapted for a voltage signal converting application, the signal converter comprising:

• a first chopper circuit module, composed of a differential operational amplifier, and having a differential input terminal, the differential input terminal of the first chopper circuit module receiving a high voltage signal and converting the high voltage signal into a first low voltage half wave signal for outputting;
• a second chopper circuit module, composed of another differential operational amplifier, and having a differential input terminal, the differential input terminal of the second chopper circuit module receiving the high voltage signal and converting the high voltage signal into a second low voltage half wave signal for outputting;
• and
• a zero point detecting circuit module, receiving the first low voltage half wave signal from the first chopper circuit module and the second low voltage half wave signal from the second chopper circuit module, and converting the first low voltage half wave signal and the second low voltage half wave signal into a square wave having a same frequency of the high voltage signal for outputting;
• wherein the square wave has a high level corresponding to a positive half cycle of the high voltage signal and a low level corresponding to a negative cycle of the high voltage signal, and the square wave has a rise edge and a fall edge which occur at a time when a voltage of the high voltage signal is zero.

A method adapted for a signal converter, applied for a voltage signal converting application, the method comprising the steps of:

• inputting a high voltage signal to a differential input terminal of a first chopper circuit module and a differential input terminal of a second chopper circuit module, respectively;
• using the first chopper circuit module to convert the high voltage signal inputted thereto into a first low voltage half wave signal for outputting;
• using the second chopper circuit module to convert the high voltage signal inputted thereto into a second low voltage half wave signal for outputting;
• and
• using a zero point detecting circuit module to receive the first low voltage half wave signal and the second low voltage half wave signal, and convert the first low voltage half wave signal and the second low voltage half wave signal into a square wave having a same frequency of the high voltage signal for outputting;
• wherein the square wave has a high level corresponding to a positive half cycle of the high voltage signal and a low level corresponding to a negative cycle of the high voltage signal, and the square wave has a rise edge and a fall edge which occur at a time when a voltage of the high voltage signal is zero.