Multiphase DC/DC Converter Phase Skewing Mitigates Spurs
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Solution Overview
Problem
DC converters generate unwanted noise, known as spurs, due to phase mismatches, which degrade the output signal and impact the operation of systems like communication transmitters, leading to data loss, reduced bandwidth, and increased emissions.
Innovation Solution
A multiphase DC/DC converter system with a control unit and measurement unit that identifies phase mismatches and applies adjustments such as supply voltage, inductor, switching frequency, pulse width, and cross-over timing adjustments to mitigate spur generation, using a control unit to generate parameter adjustment signals based on feedback from measured properties like voltage and phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple phases are used to generate DC output, then power conversion capability is improved, but spur generation increases due to phase mismatches
Solution Approach 1:
The patent applies parameter changes by adjusting the phase shift between multiple DC/DC converter phases. Specifically, the phase shift is modified from the ideal equal distribution (e.g., 90 degrees for 4 phases) to non-equal phase shifts, thereby changing the timing parameters of switching operations to mitigate spur generation while maintaining power conversion capability
Solution Approach 2:
The patent implements feedback mechanisms to measure and detect spur levels generated by the multiphase converter. The system uses feedback signals from spur measurements to dynamically adjust phase shift parameters and other converter settings, creating a closed-loop control system that continuously optimizes performance while minimizing harmful spurs
2Object-generated harmful factors
If phase adjustments are applied to mitigate spurs, then spur generation is reduced, but system complexity increases
Solution Approach 1:
The patent applies dynamics by implementing adjustable and reconfigurable phase shift parameters that can be dynamically modified based on operating conditions. The system transitions from static fixed phase shifts to dynamic adjustable phase shifts, allowing the converter to adapt to varying loads and minimize spurs in real-time without requiring complete system redesign
Solution Approach 2:
The patent changes key operational parameters including phase shift angles, switching frequencies, and pulse widths to mitigate spur generation. By adjusting these parameters rather than redesigning the fundamental converter architecture, the system reduces spurs while maintaining relatively simple hardware structure
3Device complexity
If conventional DC/DC converter operation is used, then device simplicity is maintained, but receiver sensitivity deteriorates due to unwanted emissions
Solution Approach 1:
The patent modifies operational parameters such as phase shift angles and switching timing to reduce electromagnetic emissions that interfere with receiver sensitivity. These parameter adjustments are implemented through control circuitry that modifies timing signals without fundamentally changing the converter's simple DC/DC topology
Solution Approach 2:
The patent incorporates feedback mechanisms that monitor system performance and adjust operating parameters to minimize emissions affecting receiver sensitivity. The feedback loop detects degradation in receiver performance and automatically adjusts converter parameters to restore optimal operation while maintaining device simplicity
Data Source
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AI summary
A voltage converter system is disclosed. The system has a control unit, a multiphase converter, and a measuring unit. The control unit is configured to generate one or more converter parameter adjustments from a feedback signal. The multiphase converter is configured to selectively generate an output signal at a selected voltage and to adjust one or more converter parameters using the one or more converter parameter adjustments to mitigate generation of spurs in the output signal. The measuring unit is configured to measure the output signal and generate the feedback signal from the output signal.