Frequency Doubling Resonant Converter for High-Power Processor VRMs
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Solution Overview
Problem
High-end computing applications face challenges in efficiently delivering high power to processors due to the limitations of conventional power supply systems, which often result in increased costs and decreased efficiency, especially when dealing with high currents and voltage conversion ratios.
Innovation Solution
A frequency doubling resonant converter topology is introduced, comprising a dual half-bridge resonant converter, a step-down transformer, an interphase transformer, and a rectifier, which converts input DC voltage to frequency-doubled AC voltage, then to a stepped-down AC voltage, and finally to a DC output voltage, capable of doubling the output current and reducing switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a buck converter is used for voltage conversion, then the voltage conversion can be easily implemented, but the current requirements become excessively high leading to power dissipation
Solution Approach 1:
The patent changes the voltage conversion approach from direct buck conversion to resonant frequency doubling conversion. By operating at lower frequencies and using resonant circuits, the system reduces current stress and power dissipation while maintaining voltage conversion capability. The resonant converter uses LC circuits to achieve soft switching, reducing resistive losses.
2Loss of energy
If the input voltage is increased to 12Vdc, then the current requirements are reduced, but the number of phases required becomes excessive
Solution Approach 1:
The patent segments the power conversion function into distinct stages: a resonant inverter stage that generates AC voltage, followed by a rectifier stage that converts to DC. This segmentation allows each stage to be optimized independently, avoiding the need for multiple phases while achieving the required power conversion.
Solution Approach 2:
The patent employs periodic switching of the resonant inverter at a frequency doubled operation mode, where the output frequency is twice the switching frequency. This periodic action enables continuous power delivery with reduced component count compared to multi-phase buck converters.
3Power
If the number of phases is increased, then the power handling capability is improved, but the cost and switching losses increase
Solution Approach 1:
The resonant inverter circuit performs multiple functions: voltage inversion, frequency doubling, and current limiting. The LC resonant circuit provides both voltage transformation and current regulation, eliminating the need for separate control circuits and components required in multi-phase buck converters.
4Ease of operation
If hard switching is used in buck converter, then the control is simple, but the switching losses are exacerbated
Solution Approach 1:
The patent uses resonant oscillation in LC circuits to achieve soft switching. The resonant frequency of the LC circuit is tuned to match the switching frequency, creating natural current zeros that enable lossless switching transitions without complex control circuitry.
Solution Approach 2:
The patent replaces the mechanical hard switching mechanism with a resonant electromagnetic field-based switching mechanism. The resonant inverter uses the natural oscillation of the LC circuit to transfer energy, eliminating the need for forced commutation and reducing switching losses.
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 solution enhances power handling efficiency, reduces costs, and minimizes switching losses by operating at lower switching frequencies, allowing for the use of lower-rated switches and smaller magnetic components, while effectively addressing the limitations of conventional VRMs in high-power computing.
Implementation Method 1
A resonant frequency doubling converter includes a resonant circuit having a resonant frequency equal to a frequency of the AC output voltage
Implementation Method 2
a step down transformer configured to reduce the frequency doubled AC voltage to a stepped down AC voltage
Implementation Method 3
a rectifier configured to convert the stepped down AC voltage into a DC output voltage for delivery to a load
Data Source
AI summary
A frequency doubling resonant converter can include a dual half bridge resonant converter configured to receive an input DC voltage and convert it to an frequency doubled AC voltage having a frequency twice the switching frequency of the dual half bridge resonant converter. The converter can further include a step down transformer configured to reduce the frequency doubled AC voltage to a stepped down AC voltage. The converter can further include a rectifier configured to convert the stepped down AC voltage into a DC output voltage for delivery to a load. The converter may optionally include an interphase transformer coupled between the step down transformer and the rectifier and configured to increase an output current of the converter. The frequency doubling resonant converter may be configured, for example, to double an output current received from the step down transformer.