Resonant Switching Power Source With Parallel Transformers
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Solution Overview
Problem
Existing resonant switching power source devices face challenges in reducing the electric current flowing through the primary winding of a transformer, controlling peak current through rectifying smoothers in the secondary side, and independently generating stable DC output voltages of desired levels from multiple output terminals, leading to inefficiencies and uneven output voltages.
Innovation Solution
The resonant switching power source device incorporates additional transformers with parallel primary windings and a control circuit to manage circulation currents, reducing the effective current through primary windings and ensuring independent operation of each transformer to prevent current concentration, thereby stabilizing DC output voltages and improving power conversion efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If additional transformers with parallel primary windings are incorporated, then the effective current through primary windings is reduced and power conversion efficiency is enhanced, but the device complexity increases
Solution Approach 1:
The patent divides the single transformer into multiple transformers (first transformer and additional nth transformer) with separate primary windings and secondary windings. Each transformer handles a portion of the total power conversion load, segmenting the current flow and reducing the effective current through each individual primary winding. This segmentation directly addresses the technical contradiction by distributing the energy loss across multiple components while managing the increased device complexity through modular architecture.
2Productivity
If circulation current is reduced through multiple transformers, then power conversion efficiency improves, but the manufacturing cost increases due to additional components
Solution Approach 1:
The patent designs the additional nth transformer with the same structural configuration as the first transformer, allowing both transformers to perform identical power conversion functions. This multi-functionality approach enables the system to achieve improved power conversion efficiency through parallel operation while using standardized components that can be manufactured using the same processes, thereby mitigating the increase in manufacturing cost despite the additional components required.
3Stability of the object's composition
If independent operation of each transformer is ensured, then stable DC output voltages are generated from multiple terminals, but the control circuit complexity increases
Solution Approach 1:
The patent incorporates a control circuit that monitors the DC output voltages from each transformer's secondary winding and adjusts the circulation current distribution accordingly. The control circuit receives feedback signals from voltage detection circuits associated with each transformer output and modifies the switching signals to maintain stable DC output voltages across all terminals. This feedback mechanism enables independent operation of each transformer while managing the control circuit complexity through systematic voltage regulation.
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
This configuration reduces the effective current through primary windings, enhances power conversion efficiency, and allows for the independent generation of stable DC output voltages from multiple terminals, preventing uneven output voltages and reducing power conversion losses.
Implementation Method 1
a resonance circuit therein converts electric current flowing through switching elements into a sinusoidal wave form for zero current switching (ZCS)
Implementation Method 2
a first transformer (5) which has a first primary winding (6a) connected in parallel to first or second switching element (1 or 2)
Implementation Method 3
a first rectifying smoother (10) connected between a secondary winding (5b) of first transformer (5) and first output terminals (11, 12)
Data Source
AI summary
A resonant switching power source device is provided which comprises first and second MOS-FETs 1 and 2 connected in series to a DC power source 3, a first transformer 5 which has a first primary winding 5a connected in parallel to first or second MOS-FET 1 or 2 and in series to a first capacitor 4, a first rectifying smoother 10 connected between a secondary winding 5b of first transformer 5 and first output terminals 11, 12, a second transformer 6 which has a primary winding 6a connected in parallel to primary winding 5a of first transformer 5, and a second rectifying smoother 20 and an output-regulatory MOS-FET 41 connected between a secondary winding 6b in second transformer 6 and second DC output terminals 21 and 22 to control peak current flowing through primary windings of transformers 5 and 6 and rectifying smoothers 10 and 20 in secondary sides for improvement in power conversion efficiency and to produce stable DC outputs of desired level from a plurality of output terminals 11, 12, 21 and 22.