Multi-Phase Interleaved Converter Current Control
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Solution Overview
Problem
Multi-phase interleaved converters face challenges in efficiently controlling current imbalances and reducing the load on the Micro Controller Unit (MCU), as existing methods either require separate current controllers for each phase or struggle to reflect precise current changes across phases.
Innovation Solution
A method and apparatus that utilize a filter to smooth currents into direct values and a controller to adjust duty ratios across phases based on filtered current values, reducing the load on the MCU by generating and adjusting duty ratios in separate cycles, and applying phase differences to balance currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate current controllers are applied to each phase to control current, then current control precision is improved, but the load on the MCU increases
Solution Approach 1:
The patent merges the current sensing and control functions into a unified approach where a single current sensor measures the total current, and a controller distributes this current across multiple phases by adjusting duty ratios. This consolidation reduces the number of separate current controllers needed, thereby decreasing MCU load while maintaining current control precision through centralized monitoring and distributed control logic.
Solution Approach 2:
The controller is designed to perform multiple functions: it senses the total current, calculates the appropriate duty ratios for each phase, and adjusts the switching signals accordingly. This multi-functional approach eliminates the need for separate dedicated current controllers for each phase, reducing overall system complexity and MCU burden while preserving precise current control capabilities.
2Device complexity
If a single current controller is applied to one phase to reduce MCU load, then MCU load is reduced, but current changes in other phases cannot be reflected precisely
Solution Approach 1:
The system implements a feedback mechanism where the controller continuously monitors the total current and adjusts the duty ratios of all phases based on the detected current changes. This feedback loop ensures that current changes in any phase are reflected in the overall control strategy, maintaining precision without requiring separate controllers for each phase. The controller dynamically redistributes current based on real-time conditions across all phases.
Solution Approach 2:
The control approach segments the current control function by phase while using a unified sensing mechanism. The controller divides the total current measurement into phase-specific duty ratio adjustments, allowing precise response to current changes in any phase through mathematical distribution rather than physical separation of sensors and controllers.
3Object-generated harmful factors
If the number of phases in an interleaved converter is increased to reduce ripple current, then ripple current magnitude is reduced, but the number of circuit elements increases
Solution Approach 1:
The patent merges multiple phase circuits into a unified interleaved converter structure where phases share common components such as the current sensor, controller, and parts of the magnetic circuit. This consolidation allows the system to achieve the ripple-reduction benefits of multi-phase operation without proportionally increasing the total number of discrete circuit elements, as shared components serve multiple phases simultaneously.
Solution Approach 2:
Circuit elements are designed with multi-functionality to serve multiple phases. For example, a single current sensor measures the combined current from all phases, and the controller uses this information to regulate all phases. This universal approach allows the converter to operate with multiple phases for reduced ripple while avoiding the need for dedicated components for each phase, thereby limiting the increase in overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for more precise duty ratio adjustments across phases, reducing current imbalances and the load on the MCU, while maintaining energy efficiency and adjusting the size of circuit elements.
Implementation Method 1
operating, by a controller, a filter, to filter currents flowing into converters of respective phases
Data Source
Figure 1A
Figure 1B~1C
Figure 2A
AI summary
A method and apparatus for controlling a current of a multi-phase interleaved converter are provided. The method includes filtering, through a filter, currents flowing into converters of respective phases in a multi-phase interleaved converter having multiple phases, The method further includes receiving values of the filtered currents for respective phases and a duty ratio for any one of the multiple phases generated in response to a current flowing into the phase and adjusting duty ratios for phases other than the phase, based on the received current values for respective phases.