DC-DC Power Conversion Circuit with Parallel Transformers
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Solution Overview
Problem
Existing DC-DC power conversion circuits face challenges in achieving sufficient isolation between primary and secondary sides, especially at high frequencies, due to limitations in capacitors and transformers, leading to reduced efficiency and potential breakdown at voltages greater than 1 kV.
Innovation Solution
The implementation of a DC-DC power conversion system with additional transformers and capacitors in parallel, along with soft switching techniques, to enhance isolation and efficiency, allowing bi-directional power transfer while maintaining symmetry and reducing circuit losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional transformers and capacitors are added in parallel to increase isolation voltage, then isolation between primary and secondary sides is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple transformers in parallel configuration to achieve higher isolation voltage ratings. By merging multiple transformation paths, the system attains greater isolation capability while distributing the electrical stress across multiple components, thereby resolving the contradiction between reliability and complexity through systematic integration.
Solution Approach 2:
The isolation function is segmented across multiple transformer-capacitor units rather than relying on a single component. Each unit contributes to the overall isolation voltage, allowing the system to achieve high isolation ratings through modular assembly of standardized components, which manages complexity through repetition of proven design blocks.
2Loss of energy
If soft switching techniques are implemented to reduce circuit losses, then energy efficiency is improved, but control complexity increases
Solution Approach 1:
The control system prepares switching transitions in advance by pre-charging or pre-discharging capacitor banks before main switching events. This preliminary action ensures that voltage and current conditions are optimized at the moment of switching, minimizing losses without requiring complex real-time control algorithms during the actual switching instant.
Solution Approach 2:
The system dynamically adjusts switching parameters such as duty cycle, switching frequency, and capacitor charging voltages to optimize soft switching conditions. By changing operational parameters rather than hardware architecture, the system achieves reduced losses with relatively simple control mechanisms that adapt to load conditions.
3Adaptability or versatility
If bi-directional power transfer capability is added, then adaptability is improved, but device complexity increases
Solution Approach 1:
The transformer-capacitor topology is designed with inherent symmetry that allows it to function in multiple modes: forward power transfer, reverse power transfer, and bidirectional simultaneous operation. The same physical components serve multiple functional purposes, achieving versatility without proportionally increasing hardware complexity through clever utilization of component characteristics.
Solution Approach 2:
The control system can invert the normal switching sequence to achieve reverse power flow. By swapping the active and inactive states of corresponding switches on primary and secondary sides, the system reverses power direction without requiring separate dedicated components for each direction, managing complexity through operational inversion rather than structural duplication.
4Productivity
If inductive power transfer period is extended to improve power transfer efficiency, then energy transfer is improved, but switching frequency decreases
Solution Approach 1:
The system employs periodic capacitor charging and discharging cycles that are synchronized with the inductive power transfer periods. By creating regular periodic patterns in the switching sequence, the system extends the effective energy transfer window while maintaining predictable switching frequencies that allow sufficient time for complete energy transfer cycles, balancing efficiency and frequency requirements.
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 provides increased isolation voltage greater than 1 kV, improves power transfer efficiency, and reduces circuit losses by enabling longer inductive power transfer periods and efficient capacitive power transfer, while using less expensive switches with lower voltage ratings.
Implementation Method 1
The quantity of power transfer through the DC-DC power conversion circuitry can include an amount of capacitive power transfer across the first capacitor, the second capacitor
Implementation Method 2
The amount of inductive power transfer can correspond to an inductive power transfer period during the duty cycle of the first switch
Data Source
AI summary
A power transfer system includes DC-DC power conversion circuitry that has a first switch and a second switch on either side of a first transformer and a first capacitor and a second capacitor on either side of a second transformer that is connected in parallel with the first transformer. Primary secondary sides of the DC-DC power conversion circuitry are aligned based a direction of power transfer. A quantity of power transfer through the DC-DC power conversion circuitry is determined based on power and voltage characteristics of electrical components. A duty cycle and a switching frequency for the first switch or second switch is determined based on the quantity of power to be transferred. The primary and secondary switches are controlled using switching.