Power Module Control via Phase-Shifted Carrier Waves
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Solution Overview
Problem
In power conversion systems with multiple modules connected in parallel, existing technologies face inefficiencies under light loads due to high switching losses, output voltage ripples, and uneven module operation, leading to low overall efficiency and increased system losses.
Innovation Solution
A control method that configures carrier waves with a phase shift of 2π/N between adjacent power modules and selects modules to run based on a modulation wave amplitude, allowing for coordinated operation and reduced module activation during light loads, thereby optimizing efficiency and reducing output voltage ripples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power modules operate simultaneously under light load, then the system can maintain continuous power delivery, but switching losses increase and efficiency decreases
Solution Approach 1:
The patent implements periodic action by enabling power modules to operate in an interleaved manner with phase shifts. Instead of all modules operating continuously, they are activated in periodic cycles with different timing, reducing simultaneous switching events and thereby lowering switching losses while maintaining continuous power delivery through the parallel configuration.
Solution Approach 2:
The control device dynamically adjusts the operating state of each power module based on real-time system conditions. By dynamically enabling or disabling specific modules according to load requirements and phase timing, the system optimizes efficiency under varying load conditions while ensuring continuous power supply.
2Adaptability or versatility
If all power modules operate simultaneously, then the system can handle varying loads, but output voltage ripple increases under light load
Solution Approach 1:
The patent applies periodic action by implementing interleaved operation of power modules with phase-shifted carrier waves. This periodic activation pattern distributes the power delivery across different time intervals, smoothing out voltage fluctuations and reducing output voltage ripple while maintaining the system's ability to handle varying loads.
Solution Approach 2:
The control device segments the operation of power modules by assigning different phase shifts to each module's carrier wave. This segmentation of operational timing allows the system to distribute the total power output across multiple modules in a staggered manner, reducing simultaneous switching effects and minimizing voltage ripple.
3Device complexity
If power modules operate without coordination, then the control system is simple, but module operating time becomes uneven leading to inconsistent aging
Solution Approach 1:
The patent introduces asymmetry by applying different phase shifts to the carrier waves of individual power modules. This asymmetric timing arrangement ensures that each module operates for different intervals in a balanced cycle, distributing wear and operating time evenly across all modules while maintaining relatively simple control logic through standardized phase-shift implementation.
Data Source
AI summary
A method for controlling a power conversion system includes: configuring a carrier period of the power modules, and configuring a phase shift of carrier waves of the adjacent power modules to be 2π/N; selecting M power modules to operate within the carrier period, where O≤M≤N, and providing a modulation wave to the power modules, an amplitude of the modulation wave being A/N of a carrier peak of the carrier waves; and comparing the value of the modulation wave with a value of the carrier wave of each of the power modules, respectively, wherein, when the value of the modulation wave is greater than the value of the carrier wave, the corresponding power module runs; when the value of the modulation wave is less than or equal to the value of the carrier wave, the corresponding power module stops.