DC-DC Converter Switching Control for Soft-Switching Heat Reduction
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Solution Overview
Problem
Existing direct-current-to-direct-current converters, particularly those using phase shift modulation, generate excessive thermal energy due to limited soft switching states, which is not efficiently managed by existing control methods.
Innovation Solution
A system and method for a direct-current-to-direct-current converter that employs a controller to dynamically select between phase shift, triangular waveform, and trapezoidal waveform control modes based on measured system parameters, optimizing gate trigger voltage timings to maximize soft switching and minimize thermal energy generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If phase shift modulation mode is used, then the converter can operate with simple control, but the switches produce greater thermal energy due to limited soft switching states
Solution Approach 1:
The patent implements dynamic switching between different modulation modes (phase shift, triangular waveform, trapezoidal waveform) based on real-time operating conditions such as power level and load requirements. This allows the system to adaptively select the optimal control strategy, transitioning from static phase shift modulation to dynamic multi-mode operation that maximizes soft switching states and minimizes thermal energy generation.
Solution Approach 2:
The patent changes the control parameters by introducing multiple modulation modes with different characteristics. At high power levels, phase shift modulation is used; at intermediate power levels, trapezoidal waveform modulation is applied; and at low power levels, triangular waveform modulation is employed. This parameter-based mode selection optimizes the soft switching states and reduces thermal energy across different operating conditions.
2Object-generated harmful factors
If triangular waveform modulation mode is used, then more soft switching states are achieved, but the operating range is limited
Solution Approach 1:
The patent creates a universal control system that can perform multiple functions by implementing three distinct modulation modes within a single converter framework. Each mode (phase shift, triangular waveform, trapezoidal waveform) is optimized for specific operating ranges, and the controller seamlessly switches between them. This multi-functional approach allows the system to achieve wide operating range coverage while maintaining optimal soft switching performance across all conditions.
3Device complexity
If single phase shift mode is used for high power, then control is simplified, but switching losses increase due to hard switching
Solution Approach 1:
The patent segments the power operating range into three distinct regions (high power, intermediate power, low power), each with its own optimized modulation mode. This segmentation allows the system to apply the simplest appropriate control method for each segment while avoiding the pitfalls of using a single mode across the entire range. The segmentation strategy reduces switching losses in each segment without requiring overly complex unified control.
Data Source
Figure 1A
Figure 1B
Figure 2A~2B
AI summary
In accordance with one embodiment, a system and method of controlling a direct current to direct current converter that comprises a primary full bridge coupled to a secondary full bridge via a transformer. After the start-up time period, an electronic data processor controls the converter to operate efficiently in a first control mode, a second control mode, or a third control mode, wherein the first control mode comprises a phase shift mode, the second control mode comprises a triangular waveform control mode and wherein the third control mode comprises a trapezoidal waveform control mode. The electronic data processor determines a maximum target power range and a transition power level threshold for each one of the control modes.