Abstract
Usually, parametric synthesis of controllers for a closed control system is carried out for nominal conditions, and then the source performance for other load resistance values is estimated. As a result, the control system may not always provide the sufficient mode stabilization with a changing load resistance value. The paper suggests an alternative version. It deals with estimation of dynamic transient responses for the required mode parameter in an open-circuit system as well as with determination of transfer functions and the controller parameters for the most complicated version of transient response curves. The paper presents the results of simulation modelling of dynamic operating conditions for LLC converter using Simulink Matlab as well as load characteristics for three versions of a closed control system.
Highlights
Today, a variable frequency drive (VFD) is usually offered for LLC converters in the literature [1,2,3,4,5,6]
Phase-pulse control at constant frequency is available in a full-bridge LLC converter [7,8,9]
The transient response behavior may depend on load resistance significantly so that the degree of its oscillation would vary with changes in Rload (Figure 4)
Summary
A variable frequency drive (VFD) is usually offered for LLC converters in the literature [1,2,3,4,5,6]. Phase-pulse control at constant frequency is available in a full-bridge LLC converter [7,8,9]. The advantages of such control may be as follows:. Functions for determining the parameters of feedback circuits at given static and dynamic characteristics. They could be derived by solving differential equations or as a result of measuring the frequency response, which may require quite a lot of effort. A transfer function may be based on the acceleration curve considered to be a transient characteristic [14] which could be measured by Simulink Matlab simulation (Figure 2)
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