Shared integral term PID dual-closed-loop controller for PWM digital power supply

Abstract

The invention discloses a shared integral term PID dual-closed-loop controller for a PWM digital power supply. The dual-closed-loop controller comprises a dual-closed-loop PID control module, wherein the dual-closed-loop PID control module comprises an error module, a proportional term calculation module, a differential term calculation model, an integral term calculation module and an output module; the error module is used for measuring and calculating voltage error and current error in each sampling period, and transmitting the error to the proportional term calculation module, the differential term calculation model and the integral term calculation module separately; the proportional term calculation module is used for measuring and calculating the voltage loop proportional term and the current loop proportional term of the sampling period; the differential term calculation model is used for measuring and calculating the voltage loop differential term and the current loop differential term of the sampling period; the integral term calculation module is used for performing assignment on the shared integral term integral factor according to the size of the voltage loop proportional term and the current loop proportional term of the sampling period, and calculating the value of the shared integral term according to the integral factor; the adjustment amount of the measured and calculated voltage loop or current loop is output by the output module; and a DC / DC power supply is controlled through PWM. By virtue of the shared integral term PID dual-closed-loop controller, an overshoot phenomenon of the PWM digital switch power supply can be effectively avoided, and high dynamic characteristic and high frequency bandwidth are achieved.

Description

technical field [0001] The invention relates to the field of digital switching power supplies, in particular to a shared integral term PID double closed-loop controller of PWM digital power supplies. Background technique [0002] With the application of a large number of electric and electronic devices, all electric and electronic devices are inseparable from reliable power supplies; PWM digital switching power supplies are increasingly closely related to people's work and life. For energy storage devices, the overshoot of the output voltage and current of the power supply will damage the internal structure of the energy storage devices (such as batteries and supercapacitors, etc.), resulting in a decrease in the capacity of the energy storage device or a shortened cycle life. [0003] Existing PWM digital switching power supply systems generally adopt double closed-loop control of voltage and current, and use the sampled output voltage and current as feedback signals to rea...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a voltage and current overshoot that can effectively avoid voltage and current overshoot and has good dynamic characteristics, aiming at the problems of voltage and current overshoot caused by the control of the existing PWM digital switching power supply, as well as poor dynamic characteristics and low frequency bandwidth. , shared integral term PID double closed-loop controller for PWM digital power supply with high frequency bandwidth

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