High-precision pulse width division realizing method for pulse width control of power converter

Abstract

The invention discloses a high-precision pulse width division realizing method for the pulse width control of a power converter. A device for realizing the method comprises a clock generating module, a pulse width metering module, a metering storage module and a division module, wherein the clock generating module is used for generating a clock signal; the pulse width metering module is used for metering pulse width; the metering storage module is used for storing a pulse width metering result; the division module is used for calculating and converting the stored pulse width metering result into simulation voltage to be output; the pulse width metering module is used for metering two pulse width signals; the clock generating module generates a fixed clock according to metered pulse width and a metered precision requirement, and the clock is output and serves as a reference clock of the pulse width metering module; the pulse width metering module respectively meters and outputs the two input pulse width signals; the metering storage module stores the output of the pulse width metering module when each period of the metered pulse width ends, keeps the output until the next period ends and plays the role of sampling and keeping; and the division module performs digital-to-analog conversion according to the digital amount of the metering storage module and simultaneously performs division operation.

Description

technical field [0001] The invention relates to a method for realizing pulse width division. More specifically, the present invention relates to a new high-precision pulse width division implementation method for the implementation of various pulse width control schemes of power converters. Background technique [0002] In existing implementations using pulse width division circuits ( figure 1 ), it first converts the corresponding pulse width into the corresponding analog quantity, and then completes the division calculation of the two analog quantities through the analog division circuit to output the corresponding analog quotient value. Specifically, it needs to first convert the corresponding pulse width signal into an analog voltage signal through the integration circuit, and the sample-and-hold circuit performs sample-and-hold processing on the analog voltage signal; the voltage-current conversion circuit is responsible for converting the received analog voltage signa...

AI Technical Summary

Problems solved by technology

Due to the wide dynamic range of the pulse width, it is difficult to realize the integration circuit, and the analog sample and hold circuit requires high precision, which leads to the corresponding sample and hold circuit occupying a large area; in addition, the analog division circuit and various voltage and current conversion circuits are subject to low precision. , complex circuits, and high requirements for production technology, which limit the accuracy of the pulse width division circuit and greatly increase the implementation cost of the pulse width division circuit

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