Resonant Switching Converter Multiplexes Power Transistors
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Solution Overview
Problem
Switching converters face challenges in achieving high power density, efficiency, and dynamic characteristics due to increased switching frequency, which leads to higher switching losses and voltage stress on power devices, and requires innovative solutions to reduce transformer turns ratio and component volume.
Innovation Solution
A resonant switching converter with a multi-level generating circuit and resonant tank that multiplexes power transistors to generate a voltage signal with alternating zero and non-zero values, reducing voltage stress and switching losses, and achieving high frequency operation by controlling the switching frequency and transformer turns ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If switching frequency is increased to achieve high power density, then power density is improved, but switching losses increase
Solution Approach 1:
The patent applies resonant oscillation in the power stage circuit, utilizing the natural resonant frequency of the tank circuit (comprising inductor and capacitor) to create controlled voltage and current oscillations. This resonant vibration allows the circuit to operate at high frequency while maintaining low switching losses by synchronizing switch operation with the resonant peaks, where voltage and current are simultaneously zero or minimal.
Solution Approach 2:
The patent changes the operating parameters by operating the switch at specific timing points during the resonant cycle (when voltage or current passes through zero). By dynamically adjusting the switching timing based on the resonant state, the system achieves high frequency operation with minimized switching losses, as the switch transitions occur when stress is naturally low.
2Power
If switching frequency is increased to achieve high power density, then power density is improved, but voltage stress on power devices increases
Solution Approach 1:
The resonant tank circuit creates controlled voltage oscillations that periodically reduce voltage stress on power devices. By timing the switching operations to coincide with voltage peaks or zero-crossings in the resonant waveform, the patent minimizes the voltage stress experienced by switches and other power devices during high-frequency operation.
3Speed
If transformer turns ratio is reduced to improve dynamic characteristics, then dynamic response is improved, but voltage stress on components increases
Solution Approach 1:
The resonant oscillation in the tank circuit provides natural voltage and current waveforms that reduce stress on components. This allows the use of lower transformer turns ratios for improved dynamic response, as the resonant voltage distribution naturally limits the voltage stress on individual components during transient operations.
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 reduces the voltage stress on power transistors and resonant components, lowers switching losses, and allows for high frequency operation, thereby enhancing power density and efficiency while minimizing system size and cost.
Implementation Method 1
a resonant tank configured to multiplex at least two power transistors in the multi-level generating circuit, and to receive the first voltage signal to achieve resonant control
Data Source
AI summary
A resonant switching converter can include: a multi-level generating circuit configured to generate a first voltage signal having at least two values, where the first voltage signal is zero in a first time interval, and is not zero and not greater than an input voltage of the resonant switching converter in a second time interval; and a resonant tank configured to multiplex at least two power transistors in the multi-level generating circuit, and to receive the first voltage signal to achieve resonant control.