SANPC DC/DC Converter Switching for Flexible Bipolar Outputs
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Solution Overview
Problem
Existing DC/DC converters are limited to a single output configuration, either symmetrical monopolar or bipolar, which restricts their applicability to specific types of loads, and inefficient switching schemes lead to high switching losses.
Innovation Solution
A DC/DC converter with a sparse active neutral point clamped converter (SANPC) and transformers, capable of operating in both symmetrical monopolar and bipolar configurations, employs zero-current switching for high-voltage switches and complementary switching for lower-voltage switches to minimize losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single output configuration (either symmetrical monopolar or bipolar) is used in existing DC/DC converters, then the device structure is simplified, but the adaptability to different load types is restricted
Solution Approach 1:
The DC/DC converter is designed with a universal output structure that can operate in both symmetrical monopolar and bipolar configurations. The converter uses four switches (S1-S4) arranged in a bridge configuration with a center-tapped transformer, allowing it to serve multiple load types through different switching patterns without requiring separate dedicated circuits for each configuration type.
Solution Approach 2:
The converter employs dynamic switching control where the operating mode (monopolar or bipolar) can be changed by adjusting the switching patterns of the four switches. The controller dynamically selects between different switching schemes based on load requirements, enabling the same hardware to adapt its functionality without physical reconfiguration.
2Loss of energy
If conventional switching schemes are used in DC/DC converters, then the control implementation is simpler, but switching losses increase due to inefficient switching patterns
Solution Approach 1:
The converter implements preliminary action by ensuring that switches are turned off before the current through them reaches zero, and turned on when the voltage across them is zero. The switching pattern is pre-coordinated so that high-voltage switches (S1, S2) and low-voltage switches (S3, S4) operate in a complementary manner, with their switching timing optimized to minimize both conduction and switching losses before the actual power transfer occurs.
Solution Approach 2:
The converter changes operating parameters dynamically by adjusting switching frequencies and duty cycles based on load conditions. The switching pattern transitions between different modes (continuous conduction mode and discontinuous conduction mode) by modifying the switching parameters, allowing the converter to optimize efficiency across varying load requirements while managing switching losses effectively.
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
The converter achieves flexible operation for various loads and reduces switching losses by utilizing zero-current switching for high-voltage switches and complementary switching for lower-voltage switches, enhancing efficiency and versatility.
Implementation Method 1
a plurality of transformers coupled to the SANPC, the plurality of transformers including a first transformer and a second transformer
Data Source
AI summary
Examples of the disclosure include a DC/DC converter including an input configured to be coupled to a DC power source, a sparse active neutral point clamped converter (SANPC) coupled to the input, a plurality of transformers coupled to the SANPC, the plurality of transformers including a first transformer and a second transformer, a first AC/DC converter coupled to the first transformer, a second AC/DC converter coupled to the second transformer, and at least one output coupled to the first AC/DC converter and the second AC/DC converter and configured to provide DC output power to one or more loads.