Constant-power load control method and circuit applied to DC-DC converter

Abstract

The invention discloses a constant-power load control method and circuit applied to a DC-DC converter, and the method comprises the steps: 1) respectively sampling an output voltage and an inductive current through a voltage sampling module and a current sampling module, and inputting the sampled signal into an ADC module; 2) converting the input sampled signal into a digital signal through an ADCmodule, and inputting the digital signal into a correction module; 3) comparing the digital signal with a prediction value obtained by solving a prediction model by using a correction module, and employing the difference value as a correction signal to be input into an MLD-MPC control module; and 4) solving the control model by using the MLD-MPC control module according to the correction signal,and achieving the constant power load control of the DC-DC converter according to the calculated switch duty ratio. According to the invention, the problems of steady-state error, poor dynamic performance and the like of a traditional constant power control method are solved, so that the DC-DC converter can quickly and stably adjust and maintain constant power output when facing disturbance suchas input voltage jump, load jump and the like.

Description

technical field [0001] The invention relates to the technical field of power electronic DC-DC converters, in particular to a constant power load control method and circuit applied to DC-DC converters. Background technique [0002] Power electronic DC-DC converters are widely used in DC microgrids due to their small size, light weight, and high efficiency. As the application scenarios of DC-DC converters become more and more diverse, nonlinear loads such as constant power loads put forward higher requirements on the control method of DC-DC converters. Traditional linearization modeling methods are difficult to accurately describe the nonlinear characteristics of DC-DC converters with constant power loads, so the constant power control of DC-DC converters requires a more accurate model. [0003] The current constant power load control methods applied to DC-DC converters mainly include: 1. State feedback control: take the output capacitance and output resistance of the DC-DC c...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings and deficiencies of the prior art, and propose a constant power load control method and circuit applied to DC-DC converters, so as to solve the problems of steady-state error and poor dynamic performance in the traditional constant power control method , so that the DC-DC converter can quickly and stably adjust in the face of disturbances such as sudden changes in input voltage and load, and maintain constant power output

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