Inverter Switch Controller Reducing PWM Losses
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Solution Overview
Problem
Inverters experience significant switching losses due to high-speed switching of all components, which reduces efficiency.
Innovation Solution
The inverter design includes a Cuk converter and a switching device unit with a controller that converts DC voltage to a half-wave rectified sine waveform and then to a sine waveform, reducing the number of switching cycles by alternately switching sets of switches, thereby minimizing high-speed PWM control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If all switches are switched at high speed through PWM control, then AC voltage generation is achieved, but switching loss increases significantly
Solution Approach 1:
The inverter circuit is divided into two functional segments: a DC/DC converter that generates half-wave rectified sine waveform voltage, and a switching device unit that converts it to sine waveform voltage. This segmentation allows different switching strategies for each segment, reducing overall switching loss while maintaining AC voltage generation capability.
Solution Approach 2:
The controller alternately switches sets of switches in the switching device unit based on the periodic nature of the half-wave rectified sine waveform voltage. By synchronizing switch activation with the voltage waveform periods and using selective switch groups, the system reduces unnecessary high-speed switching while maintaining effective AC output generation.
2Power
If four switches are used in the switching device unit, then sine waveform voltage can be generated, but device complexity increases
Solution Approach 1:
The switching device unit employs dynamic switch configuration where sets of switches are alternately activated based on the input voltage waveform characteristics. The controller dynamically selects which switches to activate, enabling sine waveform generation with optimized switch usage patterns that reduce overall system complexity while maintaining generation capability.
Data Source
AI summary
An inverter according to an embodiment of the present disclosure may include a converter having a switch, configured to convert a DC voltage into a half-wave rectified sine waveform voltage; a switching device unit having a switch, configured to convert the half-wave rectified sine waveform voltage into a sine waveform voltage; and a controller configured to control the on/off of the switch of the converter and the switch of the switching device unit.