Split-Drive Transformer Parasitic Absorption
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Solution Overview
Problem
Conventional power converter architectures face challenges in increasing switching frequencies due to parasitic effects such as transformer parasitic capacitance and proximity effect loss, which limit their efficiency and power density, especially when operating over wide voltage and power ranges.
Innovation Solution
The implementation of a split-drive transformer (SDT) architecture that reduces transformer parasitic effects by absorbing them into circuit operation, combined with a power distributor and inverter stage that processes power in multiple voltage domains, allowing the power converter to operate efficiently at higher switching frequencies and over wider ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional power converter architectures are used, then the design is simple and low-cost, but parasitic effects significantly increase loss when operating at high switching frequencies
Solution Approach 1:
The patent applies the 'Blessing in disguise' principle by converting the harmful parasitic effects (leakage inductance and parasitic capacitance) into beneficial circuit elements. The leakage inductance is absorbed into the resonant circuit to enable soft switching, and the parasitic capacitance is utilized in the resonant tank to achieve zero-voltage switching. This transforms what were previously loss-generating factors into mechanisms that enable high-frequency operation with reduced losses.
Solution Approach 2:
The patent employs 'Parameter changes' by modifying the operating parameters of the power converter, specifically transitioning from hard-switching to soft-switching operation. By changing the switching method and utilizing resonant circuits with specific inductance and capacitance values, the system achieves operation at much higher switching frequencies with significantly reduced parasitic losses.
2Power
If switching frequency is increased to achieve higher power density, then power density improves, but parasitic effects such as proximity effect loss and transformer parasitic capacitances become very important
Solution Approach 1:
The patent converts the harmful proximity effect losses and parasitic capacitances into beneficial resonant elements. By designing the transformer and circuit parameters so that parasitic effects form part of the resonant tank, the system achieves soft switching that eliminates the negative impacts of these parasitics while enabling high power density operation.
3Productivity
If conventional transformer architectures are used, then the structure is simple, but the converter timing becomes difficult to satisfy and parasitic effects significantly increase loss at high switching frequencies
Solution Approach 1:
The patent applies the 'Dynamics' principle by transitioning from static hard-switching architecture to dynamic soft-switching architecture with resonant circuits. The circuit parameters (inductance and capacitance) are carefully selected to create resonant behavior that dynamically adapts to the switching frequency, enabling the system to maintain efficient operation across high frequency ranges while managing parasitic effects.
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 approach enables power converters to operate at higher efficiency and power density than conventional designs, reducing transformer loss and enabling operation at much higher switching frequencies, thus overcoming the barriers set by parasitic effects.
Implementation Method 1
the split-drive transformer stage uses magnetic coupling to step up/down the voltage and provide isolation
Data Source
AI summary
A split drive transformer (SDT) and use of such a transformer in a power converter is described. The power converter includes a power and distributor circuit configured to receive one or more input signals and provides multiple signals to a first side of the SDT. The SDT receives the signals provided to the first side thereof and provides signals at a second side thereof to a power combiner and rectifier circuit which is configured to provide output signals to a load. In some embodiments, the SDT may be provided as a switched-capacitor (SC) SDT. In some embodiments, the power converter may optionally include a level selection circuit (LSC) on one or both of the distributor and combiner sides.