SANPC DC/DC Converter for Bipolar Output and Low Switching Loss
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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 versatility in powering different types of loads, and they often suffer from inefficient switching losses due to non-zero-current switching.
Innovation Solution
A DC/DC power converter capable of operating in both symmetrical monopolar and bipolar configurations, utilizing a sparse active neutral point clamped (SANPC) converter with zero-current switching for some switches and complementary switching states to minimize losses, while allowing flexible load connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a DC/DC converter is designed for a single output configuration (either symmetrical monopolar or bipolar), then the circuit design is simpler, but the versatility in powering different types of loads is restricted
Solution Approach 1:
The DC/DC converter is designed with a universal output configuration that can operate in both symmetrical monopolar and bipolar modes. The converter uses four switches (S1-S4) arranged in a bridge configuration that can be controlled to produce either monopolar or bipolar output, allowing a single device to serve multiple load types without requiring separate dedicated converters for each configuration.
2Loss of energy
If conventional switching methods are used in DC/DC converters, then the circuit operation is simpler to implement, but switching losses increase due to non-zero-current switching
Solution Approach 1:
The converter employs periodic switching sequences where switches are activated and deactivated in specific patterns. The control method uses periodic switching cycles with defined on/off states for each switch, creating a rhythmic switching pattern that ensures current naturally reaches zero before switch transitions, thereby minimizing switching losses while maintaining systematic control.
Solution Approach 2:
The switching control incorporates feedback mechanisms that monitor the current state and adjust switch activation accordingly. The control method uses state-dependent switching decisions where the next switch state is determined based on the current operating conditions, ensuring that switching occurs at optimal moments when current is zero or minimal, thus reducing energy losses.
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 efficiently powers multiple loads with reduced switching losses, supporting both symmetrical monopolar and bipolar configurations, and can handle unbalanced load demands, enhancing versatility and efficiency.
Implementation Method 1
utilizing a sparse active neutral point clamped (SANPC) converter with zero-current switching for some switches
Implementation Method 2
a plurality of transformers coupled to the SANPC, the plurality of transformers including a first transformer and a second transformer
Data Source
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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.