Parallel Resonant Power Supply with Phase-Shifting Control
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Solution Overview
Problem
Conventional resonant converters face challenges in achieving low ripple and uniform current output due to difficulties in controlling parallel-connected resonant circuits, especially in high-power applications, where phase-shifting output currents are required but frequency modulation is used, leading to inefficiencies and high ripple factors in output currents.
Innovation Solution
A power supply device that includes a first and second power factor corrector, each coupled with a resonant circuit, and a current regulating circuit that generates driving signals to stabilize and regulate the output currents, using phase-shifting and voltage control mechanisms to balance output currents and stabilize output voltage, allowing for uniform current output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If parallel-connected resonant converters are used to achieve high output power, then output power is improved, but output current ripple factor increases
Solution Approach 1:
The patent divides the single resonant converter into multiple parallel-connected resonant converters (first and second resonant converters). Each converter processes a portion of the total power, allowing high output power to be achieved while managing ripple through individual control of each segment
Solution Approach 2:
The patent changes the operating parameters by introducing phase shifting between parallel converters and using frequency modulation to adjust the operating frequency. This allows optimization of both power output and ripple reduction by tuning the phase difference and frequency of each parallel converter
2Object-generated harmful factors
If phase-shifting control is applied to reduce ripple factor, then output current uniformity is improved, but control complexity increases
Solution Approach 1:
The patent implements feedback control mechanisms where the operating frequency and phase shifting are adjusted based on the load conditions and output requirements. The controller monitors the system state and automatically adjusts parameters to maintain low ripple factor without requiring complex manual tuning
Solution Approach 2:
The patent uses dynamic frequency modulation and adaptive phase shifting that automatically adjusts to different operating conditions. The control parameters are not fixed but dynamically optimized based on the actual load and output requirements, simplifying the control process while maintaining performance
3Loss of energy
If frequency modulation is used to control resonant converters, then conversion efficiency is improved, but ability to achieve uniform current output deteriorates
Solution Approach 1:
The patent combines frequency modulation with phase shifting parameter changes. By simultaneously adjusting both the frequency and phase of parallel resonant converters, it maintains the high conversion efficiency benefits of frequency modulation while achieving uniform current output through coordinated phase control
Solution Approach 2:
The patent creates a composite control strategy that integrates multiple control techniques (frequency modulation and phase shifting) into a unified control system. This composite approach leverages the advantages of each method while compensating for their individual limitations
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 stabilizes and regulates output currents, achieving low ripple and uniform current output across resonant circuits, improving power conversion efficiency and addressing the challenges of conventional control methods.
Implementation Method 1
Resonant converters are known to have advantages such as high conversion efficiency and low cost, and are hence commonly used in high-power isolated DC/DC conversion. Nevertheless, because resonant converters operate on sinusoidal current waveforms
Data Source
AI summary
A power supply device includes first and second power factor correctors, and first and second resonant circuits. The first and second power factor correctors are for receiving an alternating current (AC) input voltage, and are driven by first and second driving signals for rectifying the AC input voltage to generate first and second driving voltages, respectively. The first and second resonant circuits are coupled to the first and second power factor correctors for receiving the first and second driving voltages, respectively, and have output sides that are coupled in parallel for outputting an output voltage. The first power factor corrector and the first resonant circuit in combination is parallel-connected to the second power factor corrector and the second resonant circuit in combination.