A Design Method of Digital Power Loop Compensator Based on pidα

Abstract

A design method of a digital power supply loop compensator based on PIDα, which can realize stable, accurate and fast control of the output voltage of the digital power supply. The implementation steps are: (1) drawing a Bode diagram of the main power transfer function of the digital power supply based on simulation software; (2) Design an analog two-zero, two-pole compensator with the same zero-pole type as the PIDα digital loop compensator and draw a Bode diagram of the compensator; (3) Convert the analog two-zero, two-pole compensator in the s domain to the z domain PIDα digital loop compensator; (4) Based on the algorithm structure characteristics of PIDα digital loop compensator, program programming realizes its function; (5) Prototype experiment debugging PIDα digital power loop compensator function. By adopting the design method of the loop compensator based on PIDα of the present invention, a loop compensator with excellent performance can be designed for the digital power supply, and the stable, accurate and fast control of the output voltage of the digital power supply can be realized.

Description

technical field [0001] The invention relates to the technical field of digital power supply control, in particular to a design method of a PIDα-based digital power supply loop compensator. Background technique [0002] The accuracy and stability of the output voltage of the digital power supply, as well as the rapidity of the response to the disturbance of the input voltage and load current are determined by the open-loop gain phase curve (ie, the Bode diagram) of the digital power supply system. The feedback system stability criterion is that the open-loop phase delay must be less than 360° at the frequency where the open-loop loop gain is 1 (ie, the crossover frequency fc). Since the negative feedback comes with a -180° phase delay, the difference between the phase angle at the crossover frequency fc and -180° is defined as the phase margin. If the phase margin is too small, the DC / DC converter will self-oscillate. Engineering experience often design the phase margin abo...

AI Technical Summary

Problems solved by technology

[0006] The design method of a digital power supply loop compensator based on PIDα proposed by the present invention can solve the inability to control the strong coupling relationship between the control coefficient of the PIDα loop compensator and the key coefficient in the open-loop transfer function of the digital power supply. The technical problem of independent adjustment of the stability, accuracy and rapidity of the loop

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