Transformer Power Converter Single Switch Oscillator Design
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Solution Overview
Problem
Existing microtransformer-based power conversion systems are limited by low tank switching frequencies and significant switch-based losses due to parasitic capacitance and the need for multiple switches, which affects efficiency and power conservation.
Innovation Solution
A power conversion system design that uses a single energy switch in the current path with an oscillator coupled to the switch, minimizing switch-based losses and allowing higher switching frequencies by utilizing parasitic capacitance and removing feedback switches from the tank circuit path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cross-coupled switches are used to maintain sustainable oscillation, then the tank circuit can operate, but the parasitic capacitance increases and limits the tank switching frequency
Solution Approach 1:
The patent extracts the feedback switch from the tank circuit current path, placing it instead in the oscillator control path. This removal eliminates the parasitic capacitance of the feedback switch from limiting the tank switching frequency, while the oscillator continues to provide the necessary feedback signal for sustainable oscillation.
Solution Approach 2:
The patent segments the control functions by separating the feedback mechanism into a dedicated oscillator circuit that generates switching signals, independent from the main tank circuit current path. This allows the tank circuit to operate at high frequencies without being constrained by feedback switch characteristics.
2Loss of substance
If feedback switch is included in the current path from supply voltage to the tank, then power delivery can be regulated, but undesirable power dissipation occurs
Solution Approach 1:
The feedback switch is extracted from the high-current tank circuit path and placed in the low-current oscillator control path. This extraction eliminates the I²R power dissipation that would occur if the feedback switch carried full tank current, while feedback regulation is maintained through the oscillator's control of the energy switch.
3Device complexity
If feedback path operates at frequency much lower than desired tank switching frequency, then feedback control is simplified, but tank switching frequency is limited
Solution Approach 1:
The patent implements dynamic frequency separation where the oscillator operates at the high tank switching frequency to drive the power stage, while feedback regulation is achieved through the oscillator's natural response to load conditions. The system dynamically adapts the switching frequency to maintain optimal power transfer without being constrained by low-frequency feedback 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 design achieves improved conversion efficiency and higher tank switching frequencies, reducing power dissipation and switch-based losses, while maintaining electrical isolation between circuit loops.
Implementation Method 1
microtransformers provide power transfer from a first isolator loop to a second isolator loop
Implementation Method 2
The parasitic capacitance increases as the switch size increases and can limit the tank switching frequency
Data Source
AI summary
A transformer-based power conversion system includes a primary coil is provided in a current path that includes a single energy switch. An oscillator is coupled to a control input of the energy switch. The design conserves switch-based losses as compared to prior designs because a single switch is provided in a current path occupied by the primary coil. The design also provides improved conversion efficiency because parasitic capacitances associated with the energy switch cooperate with charge transfers generated by the oscillator.