Sine pulse width modulation controller

摘要

A sine pulse width modulation controller includes an edge detection unit for receiving a feedback input signal from the external electrical device to generate an edge signal, a register unit for storing and outputting a parameter signal, an angle increasing unit for receiving the edge signal and the parameter signal, determining cycles of pulse width modulation and generating an angle signal, a sine calculation unit for receiving the angle signal and performing a recursive algorithm based on the angle signal to implement the recursive algorithm so as to generate a sine calculation value, a multiplication unit for receiving the sine calculation value which is then further multiplied by the amplitude signal from the register unit to generate a pulse width signal, and a sine output unit receiving the pulse width signal to generate driving signals for driving the external electrical device to generate a sine terminal voltage.

主权项

1. A sine pulse width modulation controller for driving an external electrical device including at least one action element, comprising:
an edge detection unit for receiving a feedback input signal from the external electrical device to perform edge detection and generate an edge signal; a register unit for storing at least one parameter and outputting at least one parameter signal, an amplitude signal and an operational mode, wherein the at least one parameter is preset by a system or set by a user; an angle increasing unit for receiving the edge signal and the parameter signal to determine cycles of pulse width modulation (PWM) and generate an angle signal; a sine calculation unit for receiving the angle signal and performing a right shift operation based on the angle signal to implement a recursive algorithm of Coordinate Rotation Digital Computer (CORDIC) so as to generate a sine calculation value; a multiplication unit for receiving the sine calculation value multiplied by the amplitude signal from the register unit to generate a pulse width signal; and a sine output unit for receiving the pulse width signal and generating a first, second, third, and fourth sine driving signals in a manner of pulse width modulation to drive the external electrical device and cause the action element to generate a sine terminal voltage.