Voltage Regulator Phase Shift Noise Reduction
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Solution Overview
Problem
In information handling systems, simultaneous switching of multiple voltage regulators generates additive noise due to current ripple and high-frequency noise spikes, requiring additional space and cost for input chokes and bulk capacitors to mitigate noise.
Innovation Solution
Implementing a master voltage regulator controller that determines distinct switching frequencies and phase shifts for multiple voltage regulators, ensuring they switch at different times, using a common clock bus and digital communication interface to synchronize switching and minimize noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If voltage regulators switch substantially concurrently, then power delivery efficiency is improved, but noise is injected into the common power plane
Solution Approach 1:
The patent applies periodic action by implementing phased switching of voltage regulators where each regulator operates at the same frequency but with different phase offsets. This creates a distributed periodic switching pattern that maintains continuous power delivery while spreading noise events across time, preventing simultaneous switching noise while preserving the efficiency benefits of frequent switching cycles.
2Object-generated harmful factors
If input chokes and bulk capacitors are added to reduce noise, then noise on power plane is reduced, but additional space and cost are required
Solution Approach 1:
The patent extracts the noise mitigation function from traditional passive components (input chokes and bulk capacitors) and implements it through active control of switching timing. By removing the requirement for these additional components and using software-controlled phase shifting instead, the solution reduces motherboard space requirements while maintaining noise reduction effectiveness.
Solution Approach 2:
The patent replaces the mechanical/passive noise filtering approach (using physical inductors and capacitors) with an electronic/software-based approach (using controlled switching phases and digital communication). This substitution eliminates the need for bulky passive components while achieving the same noise mitigation goal through intelligent control.
3Object-generated harmful factors
If input chokes and bulk capacitors are added to reduce noise, then noise on power plane is reduced, but power losses increase
Solution Approach 1:
The patent removes the energy-lossy passive filtering components (input chokes and bulk capacitors) from the system and replaces their noise mitigation function with active phase-controlled switching. This extraction eliminates the continuous power losses associated with resistive heating in choke windings and capacitor ESR while maintaining noise reduction through temporal distribution of switching events.
Data Source
AI summary
A method and system for synchronized switching of voltage regulators in an IHS. The method includes determining, via a master voltage regulator (VR) controller, a plurality of phase shifts for a plurality of VRs configured as a master VR and at least one slave VR. The phase shifts are determined such that the VRs switch at different times from each other. A common clock signal and the phase shifts are transmitted to each of the slave VRs.