High-precision hybrid digital pulse width modulator with adaptive delay compensation

Abstract

A high-precision hybrid digital pulse width modulator with adaptive delay compensation comprises a coarse adjustment module, a fine adjustment module and a digital logic module. The coarse adjustmentmodule is used for generating a counting signal and a comparison signal. The fine adjustment module comprises a calibration module, a delay chain, an adaptive delay compensation module and a first multiplexer. The calibration module is used for generating a calibration code, correcting the calibration code in real time and generating an input pulse signal. The delay chain outputs an input pulse signal to the calibration end of the calibration module and the input end of the self-adaptive delay compensation module after the input pulse signal passes through 2n-1-k first delay units. K second delay units of the adaptive delay compensation module are used for delaying. The first multiplexer selectively outputs one of the input pulse signal, the output signals of the 2n-1-k first delay units or the output signals of the k second delay units according to the low-order input signal and generates a digital pulse width modulation signal together with the counting signal. The modulator has thecharacteristics of high precision and high linearity.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a high-precision hybrid digital pulse width modulator (Digital Pulse With Modulation, DPWM) with adaptive delay compensation. Background technique [0002] In recent years, with the development of technology at home and abroad, the characteristic line width of CMOS technology has been greatly reduced, and the integration of digital circuits has become higher and higher, which can cope with high-end applications. While maintaining low costs, the design is more efficient. for complex functions. Digitally controlled switching power supplies have gradually emerged from academic research and are entering the market. In a digital switching power supply, a digital pulse width modulator DPWM is a module used to generate a digital drive control signal to generate a periodic control signal with a corresponding duty cycle to drive the power tube and control it by adju...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of traditional DPWM in terms of accuracy, the present invention proposes a high-precision hybrid digital pulse width modulator DPWM with adaptive delay compensation, which improves the existing hybrid DPWM and eliminates the existing hybrid DPWM The error, to achieve high output accuracy under different working conditions

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