Parallel Resonant Converters Current Regulation
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Solution Overview
Problem
Resonant converters operating in parallel face challenges in achieving uniform output currents due to non-identical internal circuits, leading to difficulties in controlling switching frequencies and affecting conversion efficiency and ripple current reduction.
Innovation Solution
A power supply device with a current regulating circuit that samples output currents from both resonant converters and adjusts input voltages to ensure equal magnitudes, using a subtractor and current regulator to generate driving signals for the converting circuit, along with a phase shifting circuit to minimize ripple factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If resonant converters are operated in parallel to provide output voltage, then power conversion efficiency is improved and high power isolated DC/DC conversion is achieved, but output currents become non-uniform due to non-identical internal circuits
Solution Approach 1:
The patent implements a feedback mechanism where output currents from both resonant converters are sampled and fed back to the current regulating circuit. The regulating circuit compares these currents and adjusts the input voltage to each converter dynamically, ensuring uniform output currents despite variations in internal circuits. This closed-loop feedback system continuously maintains current balance.
Solution Approach 2:
The patent dynamically changes the input voltage parameter to each resonant converter based on real-time current measurements. By adjusting the input voltage magnitude, the current regulating circuit compensates for differences in internal circuit characteristics, thereby achieving uniform output currents from non-identical converters.
2Manufacturing precision
If switching frequencies of power switches in parallel resonant converters are controlled to achieve uniform output currents, then current uniformity is improved, but control implementation becomes difficult due to non-identical internal circuits
Solution Approach 1:
The patent introduces a current regulating circuit as an intermediary between the input voltage source and the resonant converters. This regulating circuit simplifies the control implementation by managing the switching frequency adjustments and input voltage modifications centrally, rather than requiring complex coordinated control of multiple power switches across non-identical converters.
Solution Approach 2:
Instead of directly controlling switching frequencies of power switches in non-identical converters (which is complex), the patent changes the input voltage parameter as an intermediate control variable. This approach simplifies control implementation while still achieving the desired uniform output currents.
3Object-generated harmful factors
If phase-shifting control is used to reduce ripple factor in parallel resonant converters, then ripple current reduction is achieved, but conversion efficiency is affected due to non-uniform output currents
Solution Approach 1:
The patent dynamically adjusts the input voltage magnitude parameter to achieve uniform output currents, which in turn enables effective ripple current reduction through phase-shifting control. By maintaining current uniformity, the system avoids the energy losses that would otherwise occur with non-uniform currents, thus preserving conversion efficiency while reducing ripple.
Data Source
AI summary
A power supply device for providing an output voltage includes a first resonant converter, a second resonant converter, a first converting circuit, and a current regulating circuit. The first resonant converter is for converting a first input voltage into the output voltage. The second resonant converter is for converting a second input voltage into the output voltage. The output ends of the first and second resonant converters are coupled in parallel. The first converting circuit is coupled to the first resonant converter and is operable to provide the first input voltage to the first resonant converter. The current regulating circuit receives signals related to output currents of the first and second resonant converters, and drives operation of the first converting circuit according to the signals received thereby such that the output currents of the first and second resonant converters have substantially equal magnitudes.