Distributed PWM Edge Control in Multi-Phase Power Converters
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Solution Overview
Problem
Conventional power converters require complex circuit paths for controlling multiple phases, leading to inefficiencies in signal conveyance and energy conversion, which is undesirable for both green and non-green energy sources.
Innovation Solution
Implementing a distributed control mechanism where each power converter phase adjusts its output current by modifying the leading and trailing edges of pulse width modulation signals based on feedback and average current values, reducing the need for direct controller intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a single controller is used to control multiple power converter phases, then centralized control can be achieved, but the number of circuit paths and system complexity increases
Solution Approach 1:
The control system is segmented into distributed controllers, with each power converter phase having its own controller. This segmentation eliminates the need for extensive circuit paths between a central controller and multiple phases, as each local controller independently manages its phase while maintaining system-wide coordination through shared current sensing.
Solution Approach 2:
Each power converter phase performs self-regulation by locally sensing the combined output current and comparing it against reference values. The phases autonomously adjust their own switching duties to achieve current balancing, eliminating the need for a central controller to micromanage each phase and reducing overall circuit complexity.
2Measurement precision
If individual feedback paths are provided for each power converter phase, then precise control is achieved, but additional circuit paths and complexity are required
Solution Approach 1:
Multiple individual feedback paths are merged into a single shared current sensing path. The combined output current from all phases is sensed once, and this shared feedback signal is distributed to all phase controllers. This approach maintains precise current measurement while eliminating the need for separate feedback circuitry for each phase.
Solution Approach 2:
The shared current sensing circuit serves multiple functions simultaneously: it provides feedback for voltage regulation, enables current balancing among phases, and supports overall system control. This multi-functional approach eliminates the need for dedicated feedback paths for each function, reducing circuit complexity.
3Extent of automation
If many circuit paths are used to convey control signals and feedback, then comprehensive control is achieved, but the complexity of implementing the power supply increases
Solution Approach 1:
The control architecture is segmented into autonomous modular units, where each phase controller is a self-contained module capable of independent operation. This modularity simplifies manufacturing and assembly, as standardized modules can be replicated and integrated without requiring complex inter-connecting circuitry for control signals and feedback.
Solution Approach 2:
Each phase controller autonomously performs current sensing, comparison, and adjustment operations without requiring complex external control wiring. The self-service capability of each module reduces the overall number of inter-connecting circuits needed, thereby simplifying implementation and manufacturing.
Data Source
AI summary
An apparatus includes a power converter controller. The power converter controller receives first input. A magnitude of the first input is derived from combined output current supplied from multiple power converters to a load. The power converter controller also receives second input indicating a magnitude of first output current supplied from a first power converter of the multiple power converters to the load. The combined output current includes the first output current supplied from the first power converter to the load. Based on a comparison of the second input to the first input, the power converter controller adjusts a leading edge and/or a trailing edge of a first pulse width modulation control signal. Additional examples of supporting signal edge control are discussed herein.