Matrix Converter Resonant Circuit Control for Current Distortion
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Solution Overview
Problem
Existing power conversion devices face challenges in stabilizing output, leading to distortion of input current and pulsation of output current, which affects efficiency and power factor.
Innovation Solution
A power supply control device that uses recursive calculations and predetermined values to control switching circuits, targeting zero instantaneous reactive power and optimizing output current waveform to a sine wave, thereby stabilizing the power conversion process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If soft switching is used to reduce switching loss and improve conversion efficiency, then conversion efficiency is improved, but output stability deteriorates leading to distortion of input current and pulsation of output current
Solution Approach 1:
The patent implements a control mechanism that detects output current and uses feedback to adjust switching timing. The control device calculates optimal switching timing based on detected output current to maintain stability while achieving soft switching, thereby resolving the contradiction between reducing switching loss and maintaining output stability.
2Reliability
If soft switching is implemented to reduce stress on semiconductor devices, then device reliability is improved, but input current distortion increases
Solution Approach 1:
The patent dynamically adjusts switching timing parameters based on detected output current conditions. By calculating optimal switching timing that accounts for circuit characteristics and load conditions, the system maintains soft switching benefits for device reliability while minimizing input current distortion through parameter optimization.
3Device complexity
If conventional switching control is used to maintain simple control structure, then device complexity is reduced, but output current pulsation increases
Solution Approach 1:
The control device calculates optimal switching timing in advance based on detected output current and circuit characteristics. By performing preliminary calculation of switching timing that accounts for resonant circuit behavior, the system achieves stable output current control without requiring complex real-time control structures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces distortion of input current and pulsation of output current, improving the power factor and stabilizing the power conversion device's operation.
Implementation Method 1
a phase difference between the voltage and the current generated by a resonant circuit provided on the output side
Data Source
Figure 1
Figure 2(a)~2(b)
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AI summary
A power supply control device, a power conversion system and a power supply control method are provided, in which a power conversion device has a configuration in which a resonant circuit is provided on an output side of a matrix converter using switching circuits including snubber elements so as to perform AC-AC conversion of input from a multi-phase AC power supply. Thus, the input is stabilized to reduce distortion of an input current input to the power conversion device, and to reduce pulsation of an output current output from the power conversion device. The power conversion device is controlled to make an amplitude of an output current, a phase of the output current and an instantaneous reactive power as close to a control target as possible. The amplitude and the phase of the output current and the instantaneous reactive power are derived based on: an input voltage and a phase of a multi-phase current input to the power conversion device; and characteristics of the resonant circuit.