Buck-Boost DC/DC Converter Modulation for Switching Delay Compensation
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Solution Overview
Problem
Existing power conversion devices face delays in switching operations due to inherent delays in switching devices, which are often addressed by increasing component costs, and there is a need to minimize these delays while maintaining efficiency, especially at low power transfer scenarios.
Innovation Solution
A synchronous buck-boost DC/DC converter with a controller that employs a predetermined modulation scheme to minimize switching delays by selectively activating and deactivating switches based on equations that account for transformer turns and voltage ratios, thereby optimizing switching times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If switching devices are used in power conversion devices, then power conversion function is achieved, but switching delays occur reducing efficiency
Solution Approach 1:
The controller predicts the optimal switching time point in advance based on the relationship between switching time and power transfer amount, and activates the switching device at this predetermined optimal time. This preliminary calculation and advance activation minimize switching delays and maximize power transfer efficiency.
Solution Approach 2:
The system dynamically adjusts the switching time parameter based on the predicted optimal switching time point, which is calculated considering the relationship between switching time and power transfer amount. This parameter optimization resolves the contradiction between switching speed and power transfer efficiency.
2Speed
If switching delays are reduced by hardware improvements, then switching speed increases, but device cost increases
Solution Approach 1:
The patent replaces hardware-based switching speed improvement with a software/control-based solution. The controller calculates and determines optimal switching time points using algorithms that consider power transfer characteristics, substituting expensive high-speed hardware with intelligent control software that achieves the same effect at lower cost.
Solution Approach 2:
The system optimizes the switching time parameter through calculation and prediction algorithms, achieving high switching speed without requiring expensive high-speed switching hardware. The parameter optimization approach resolves the contradiction between switching speed and manufacturing cost.
3Productivity
If switching time is optimized for high power transfer, then efficiency is maximized, but performance at low power transfer deteriorates
Solution Approach 1:
The controller dynamically adjusts the optimal switching time point based on real-time power transfer characteristics. The system continuously predicts and recalculates the optimal switching time to adapt to varying power transfer conditions, maintaining high efficiency across different power levels from low to high transfer scenarios.
Solution Approach 2:
The switching time parameter is dynamically optimized based on the predicted optimal switching time point, which varies with power transfer amount. This adaptive parameter adjustment ensures high efficiency is maintained across the full range of power transfer conditions, resolving the contradiction between high-power and low-power performance.
Data Source
AI summary
In at least one embodiment, a system is provided. The system includes a first bridge circuit, at least one transformer, a second bridge circuit, and at least one controller. The first bridge circuit includes a first plurality of switches that receives a first voltage and provides a second voltage. The transformer provides a third voltage based on the second voltage. The second bridge circuit includes a second plurality of switches that provides a fourth voltage. The controller is programmed to selectively activate at least one of the first plurality of switches and at least one of the second plurality of switches based on a predetermined modulation scheme. The predetermined modulation scheme is based on at least a number of turns of the transformer, the predetermined modulation scheme minimizing a delay in selectively activating the first plurality of switches and the second plurality of switches.