Variable Phase Compensator for Voltage Regulator Transient Response
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Solution Overview
Problem
Variable phase voltage regulators face reduced bandwidth and phase margin due to increased equivalent output inductance when the number of active phases is reduced, leading to slower load transient responses and the need for additional output capacitors.
Innovation Solution
Incorporating a variable phase compensator that adjusts gain proportionally to the ratio of active phases to total phases, enabling operation in multiple modes and compensating for changes in equivalent inductance, thereby maintaining stability and response speed without requiring excessive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the number of active phases is reduced, then power consumption is reduced, but bandwidth and phase margin are reduced leading to slower load transient response
Solution Approach 1:
The patent implements a variable phase compensator that dynamically adjusts the compensation amount based on the number of active phases. When phases are reduced, the compensator increases compensation to maintain bandwidth and phase margin, thereby preserving fast load transient response while allowing power consumption reduction through phase switching.
Solution Approach 2:
The compensator changes the compensation parameter (compensation amount) based on the operating condition (number of active phases). By adjusting the compensation amount according to the active phase count, the system maintains stable small-signal response characteristics across different power consumption modes.
2Device complexity
If the number of active phases is reduced, then device complexity is reduced, but equivalent output inductance increases leading to reduced bandwidth and phase margin
Solution Approach 1:
The system uses feedback to detect the number of active phases and adjusts the compensation amount accordingly. The variable phase compensator receives feedback about the operating mode and dynamically modifies the compensation to maintain adequate bandwidth and phase margin despite changes in equivalent output inductance.
Solution Approach 2:
The compensator adjusts the compensation parameter based on the operating condition. When fewer phases are active (higher equivalent inductance), the compensator increases compensation to maintain stability margins, effectively compensating for the parameter change in equivalent output inductance.
3Speed
If additional output capacitors are added, then load transient response is improved, but device complexity and cost increase
Solution Approach 1:
The variable phase compensator uses feedback about the active phase count to dynamically adjust compensation, replacing the need for additional output capacitors. This active compensation approach achieves fast load transient response without increasing component quantity or device complexity.
Solution Approach 2:
The patent replaces the passive mechanical approach of adding more capacitors with an active electronic compensation mechanism. The variable phase compensator electronically adjusts compensation parameters to achieve the same effect as additional capacitors would provide, but without increasing component count.
Data Source
AI summary
A control circuit for a variable phase voltage regulator comprises an error amplifier to generate a difference signal based on a difference between a reference voltage and a signal representative of a voltage at an output node of the variable phase voltage regulator. The control circuit also comprises a variable phase compensator to amplify the difference signal to produce a modified difference signal to compensate for effects of varying the number of active phases in the variable phase voltage regulator, wherein the amplification is proportional to a ratio of total number of phases in the variable phase voltage regulator to number of active phases in the variable phase voltage regulator.