Control method for digital pulse width modulation (DPWM) circuit

Abstract

The invention relates to a control method for a digital pulse width modulation circuit. By taking a counting comparison / delay line composite structure DPWM as the basis, a clock logic circuit is added, and a delay line circuit is improved; on the basis of keeping the advantages of chip area, power loss and the like in the counting comparison / delay line composite structure DPWM scheme, the processenvironment sensitivity of the circuit is optimized to obtain a high-resolution DPWM circuit, and simultaneously, the invention is slightly influenced by a manufacturing process and the working environment as much as possible, and the influence of the external environment change on the functions of the circuit is eliminated.

Description

technical field [0001] The invention belongs to the field of electronic technology, relates to the design of an integrated circuit, and is an optimized design of a digital pulse width modulation circuit DPWM, in particular a digital pulse width modulation circuit control method applied to a digitally controlled switching power supply circuit. Background technique [0002] The switching power supply using digital control technology can bring about a significant improvement in the performance of the power system, because the digital control method is flexible, less sensitive to external influences, such as being less affected by device changes, and has the ability to implement complex control algorithms . [0003] In low-power handheld devices, traditional DC-DC switching power supplies with analog pulse width modulators still occupy a relatively important position. Mainly because the digital pulse width modulator, which is the main part of the digital control loop, lacks a g...

AI Technical Summary

Problems solved by technology

[0006] The problem to be solved by the present invention is: in the existing DPWM scheme, the circuit area, operating frequency and resolution are mutually restricted, and the counting comparison / delay line hybrid structure DPWM is affected by the process conditions and the working environment, which will produce unpredictable frequencies The switching noise under the environment will bring adverse effects to the system. It is necessary to optimize the DPWM circuit and design a high-resolution DPWM circuit.

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