Amplitude normalization circuit, power supply and electronic apparatus

摘要

An amplitude normalization circuit includes: a peak detector that detects a peak value of a full-wave rectified voltage of an AC voltage; a triangular wave oscillator connected to the peak detector generates a triangular wave voltage having the peak value; a comparator connected to the triangular oscillator compares the triangular wave voltage with the full-wave rectified voltage and outputs a pulse width modulation signal; and a waveform converter connected to the comparator converts a waveform of the pulse width modulation signal and outputs an output voltage with constant amplitude.

主权项

1. An amplitude normalization circuit comprising:
a peak detector configured to detect a peak value of a full-wave rectified voltage of an AC voltage; a triangular wave oscillator connected to the peak detector, configured to generate a triangular wave voltage having a peak based on the peak value of the full-wave rectified voltage; a comparator connected to the triangular wave oscillator, configured to compare the triangular wave voltage with the full-wave rectified voltage and output a pulse width modulation signal; and a waveform converter connected to the comparator, configured to convert a waveform of the pulse width modulation signal and output an output voltage with a constant amplitude, wherein the waveform converter includes:
a level shifter configured to shift a level of the pulse width modulation signal; anda low pass filter connected to the level shifter, configured to filter the level-shifted pulse width modulation signal.