Zero-Crossing Voltage Detection Circuit and Method Thereof

摘要

A zero-crossing voltage detection circuit for detecting a phase voltage of a converter includes a comparator, a first transistor and a second transistor. The first transistor has a first base, a first collector and a first emitter. The first base couples with the first collector. The first emitter receives the phase voltage. The first collector provides a first voltage to a first terminal of the comparator. The second transistor has a second base, a second collector and a second emitter. The second base couples with the first base. The second base couples with the second collector. The second emitter receives a ground voltage. The second collector provides a second voltage to a second terminal of the comparator. The comparator compares the first voltage with the second voltage to generate a zero-crossing voltage signal.

主权项

1. A zero-crossing voltage detection circuit for detecting a phase voltage of a converter, comprising:
a comparator having a first terminal and a second terminal; a first transistor having a first base, a first collector and a first emitter, wherein the first base couples with the first collector, the first emitter receives the phase voltage, and the first collector provides a first voltage to the first terminal; and a second transistor having a second base, a second collector and a second emitter, wherein the second base couples with the first base, the second base couples with the second collector, the second emitter receives a ground voltage, and the second collector provides a second voltage to the second terminal, wherein the comparator compares the first voltage with the second voltage to generate a zero-crossing voltage signal.