Power Converter Anti-Phase Control for Ringing Cancellation
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Solution Overview
Problem
High-speed power electronics devices in power converters, such as SiC/GaN, generate ringing and ripples, requiring large and complex filters to mitigate noise, which complicates the design and increases size.
Innovation Solution
A power converter with N switching units connected in series, rectifiers, a combiner, and a controller that synchronizes switching signals to cancel ringing and ripples, allowing for a simplified filter structure and downsized device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high-speed power electronics devices (SiC/GaN) are used to increase switching speed, then efficiency and compactness are improved, but ringing and noise increase
Solution Approach 1:
The patent applies opposite-phase control to convert the harmful ringing effects into beneficial cancellation. By controlling switching units to operate in opposite phases, the ringing signals from different units are phase-shifted and cancel each other out, transforming the harmful noise into a neutralized effect
2Object-affected harmful factors
If large filters are used to remove ringings and ripples, then noise reduction is improved, but device size and complexity increase
Solution Approach 1:
Instead of using large filters to passively suppress noise, the patent actively converts the ringing effects into canceling signals through opposite-phase control. This approach reduces noise by transforming the harmful ringing into a beneficial cancellation mechanism, eliminating the need for oversized filters
Solution Approach 2:
The patent changes the phase parameter of switching signals to achieve noise reduction. By adjusting the phase relationship between switching units to be opposite, the system achieves noise cancellation without requiring changes to the physical filter structure
3Measurement precision
If high-order or multiple-stage filters are used for high-accuracy power supply, then noise removal is improved, but device size and structural complexity increase
Solution Approach 1:
The patent converts the ringing noise into canceling signals through opposite-phase control, achieving high-accuracy power supply without requiring complex high-order filters. The harmful ringing is transformed into a beneficial cancellation effect that maintains precision while simplifying the filter structure
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 solution effectively cancels ringings and ripples, simplifying the filter structure and reducing device size, while maintaining high accuracy and efficiency in power supply.
Implementation Method 1
performs control to cause, when a switching signal applied to one of the switching elements of each of the switching units makes a transition from a low level to a high level, a switching signal applied to another of the switching elements of each of the switching units to make a transition from a high level to a low level
Data Source
AI summary
A plurality of switching units are provided, and a controller performs control in an antiphase manner to approximately synchronize a rise of a control signal applied to one of the switching units with a fall of a control signal for switching applied to any one of the other switching units and synchronize a fall of the control signal applied to the one of the switching units with a rise of the control signal for switching applied to the any one of the other switching units. When control in an antiphase manner is disabled, control is performed to prevent rises or falls from coinciding with each other between the switching units. Output signals from the switching units are input to rectifiers and are combined by a combiner to become an output signal.