Daisy Chain Phase Shedding for Multiphase Switching Converters
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Solution Overview
Problem
Multiphase switching converters face challenges in efficiently adjusting the number of active phases based on load current, leading to increased system development burden and cost, particularly when trying to implement phase shedding control to optimize power delivery.
Innovation Solution
A control circuit architecture for multiphase switching converters that includes a daisy chain configuration of control circuits, where each circuit generates a phase output signal and switch control signal based on input and control signals, and determines whether to enter phase shedding mode by comparing a current indication signal with a threshold, thereby adjusting the number of active phases according to load current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the number of phases in multiphase switching converter is increased to meet higher load current requirements, then the power delivery capability is improved, but the controller complexity and system development cost increase
Solution Approach 1:
The controller is segmented into multiple independent control circuits, where each control circuit independently controls one phase of the multiphase switching converter. This segmentation allows the system to scale by simply adding or removing control circuits without redesigning the entire controller, thereby improving power delivery capability while keeping individual control circuit complexity low.
Solution Approach 2:
Each control circuit is designed with universal functionality to control any phase of the converter. The control circuits are connected in a daisy-chain configuration where each circuit can receive control signals and generate PWM outputs for its corresponding phase, allowing the same circuit design to be reused across multiple phases, reducing overall system development cost.
2Power
If all phases remain active in multiphase switching converter, then the power delivery capability is maintained, but the switching losses increase when load current is low
Solution Approach 1:
The system dynamically adjusts the number of active phases based on load current conditions. When load current is low, the phase shedding control circuit disables unnecessary phases by controlling the PWM generation, thereby reducing switching losses. When load current increases, more phases are activated to maintain power delivery capability. This dynamic adaptation resolves the contradiction between maintaining power capability and reducing energy losses.
Solution Approach 2:
The system changes the operational parameters of the control circuits by enabling or disabling specific phases based on load conditions. The phase shedding control circuit monitors load current and adjusts the number of active phases accordingly, changing the system's operational state to optimize the balance between power delivery and energy efficiency.
3Loss of energy
If phase shedding control is implemented to reduce switching losses, then energy efficiency is improved, but the control circuit complexity increases
Solution Approach 1:
The phase shedding control circuit automatically monitors load current conditions and makes decisions about which phases to disable without requiring external intervention or complex control logic. Each control circuit in the daisy-chain configuration can independently determine when to shed phases based on predefined thresholds, simplifying the overall control architecture while achieving energy efficiency.
Data Source
AI summary
A multiphase switching converter with automatic phase shedding control, wherein the multiphase switching converter includes a plurality of switching circuits coupled in parallel, and a plurality of control circuits configured in a daisy chain and respectively configured for driving a corresponding one of the plurality of switching circuits. Each of the control circuit generates a current threshold based on a corresponding sequence information, and compares a current indication signal indicative of a load current of the multiphase switching converter with the current threshold to determine whether to enter into a phase shedding mode.