Double-integration indirect sliding mode controller of DC/DC converter and control method thereof

Abstract

The invention relates to a double-integration indirect sliding mode controller of DC / DC converter. A signal output terminal of a voltage sampler is connected with an inverting input terminal of a subtractor; a positive-phase input terminal of the subtractor serves as a reference voltage input terminal; an output terminal of the subtractor is connected with an input terminal of a proportion integrator; and an output terminal of the proportion integrator is connected with a first input terminal of a summator. A signal input terminal of a current sampler is used for collecting currents flowing through a main circuit filter capacitor of a DC / DC converter; and a signal output terminal of the current sampler is connected with a second input terminal of the summator. A signal output terminal of the voltage sampler is connected with a third input terminal of the summator; and an output terminal of the summator is connected with an in-phase input terminal of a comparator. An output terminal of a sawtooth generator is connected with an inverting input terminal of the comparator. With the controller, the dynamic performance and robustness of the DC / DC converter are effectively improved.

Description

technical field [0001] The invention relates to the technical field of a control method for a DC / DC (converting a fixed DC voltage into a variable DC voltage) converter, in particular to a double-integral indirect sliding mode controller and a control method for a DC / DC converter. Background technique [0002] As a control method, sliding mode control was originally used to control variable structure systems. Its main advantage is that it can maintain good stability and robustness under uncertain load disturbances, input disturbances or system parameter changes. In addition, sliding mode controllers are highly flexible and easy to implement in applications compared to other nonlinear controllers. These advantages make sliding mode control very suitable for controlling nonlinear systems, such as DC / DC converter main circuit 1 such as figure 1 described, including the power supply V i , power switch S w , diode D, filter capacitor C, energy storage inductor L, resistive loa...

AI Technical Summary

Problems solved by technology

[0003] However, the sliding mode controller is often limited in two main aspects in the practical application of DC / DC converters: First, the operating frequency of the sliding mode controller is not fixed, which makes the application of sliding mode control in engineering more complicated and difficult. It is beneficial to engineering application; the second is that the steady-state error in the adjustment process of sliding mode control is too large, which will cause the output voltage to jump up and down near the design value, the deviation is large, and the steady-state effect of the DC / DC converter is relatively poor

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