Multiphase Power Converter Distributed Control Circuit
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Solution Overview
Problem
Existing multiphase power converters require complex and bulky centralized controllers to manage control signals for each phase, leading to inefficiencies in power density and control signal interleaving.
Innovation Solution
A multiphase power converter system with multiple power stage circuits, each having a corresponding control circuit that receives a centralized control signal with distinct pulses to manage phase sequences, allowing for efficient and uniform interleaving of control signals and improved power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a centralized controller is used to modulate output voltage and generate control signals for each phase converter, then the control function is achieved, but the controller becomes complex and bulky
Solution Approach 1:
The centralized controller is segmented into multiple distributed control circuits, one for each phase converter. Each control circuit independently generates control signals for its corresponding phase based on a phase sequence, eliminating the need for a single complex centralized controller while maintaining coordinated control of all phases.
Solution Approach 2:
Each control circuit is designed with universal functionality to control any phase converter regardless of its position in the sequence. The control circuits use the same phase sequence signal to determine their operation timing, making the system scalable and adaptable to different numbers of phases without requiring different controller designs.
2Ease of operation
If a centralized controller is used to manage control signals for each phase converter, then control is achieved, but the power density is reduced
Solution Approach 1:
By segmenting the centralized controller into distributed control circuits, the physical footprint is reduced, allowing for more compact power converter design. This segmentation enables better spatial arrangement of components, improving power density while maintaining control functionality.
Solution Approach 2:
Each control circuit autonomously generates its control signals based on the phase sequence, eliminating the need for a large centralized controller. This self-service approach reduces the overall controller size and allows for more efficient use of space within the power converter, thereby improving power density.
3Stability of the object's composition
If control signals for each phase are generated by a centralized controller, then coordination is achieved, but uniform interleaving of control signals is difficult
Solution Approach 1:
The control system uses periodic phase sequence signals with specific phase differences to generate control signals for each phase converter. This periodic action ensures uniform interleaving of control signals across all phases, achieving stable coordination while simplifying the control logic compared to centralized approaches.
Solution Approach 2:
The system achieves uniform interleaving by changing the phase parameter of control signals according to a predefined phase sequence. Each control circuit adjusts its signal timing based on its position in the sequence, creating uniform interleaving patterns without requiring complex coordination logic.
Data Source
AI summary
The present disclose relates to a multiphase power converter and control circuit and control method thereof. The multiphase power converter comprises a plurality of power stage circuits, and each power stage circuit corresponds to one control circuit, each of the control circuit comprises a first port and a second port, wherein the first ports are connected to each other to receive centralized control signal, and the second port is configured to identify a phase sequence of each phase. The control circuit adjusts a working state of the current power stage circuit by gating corresponding pulse in the centralized control signal according to the centralized control signal and a current phase sequence, thereby realizing an interleaved control of the multiphase power converter. The control method realizes a uniform interleaving of control signals of each phase efficiently and simply, and further improves a power density of the multiphase power converter.