Multi-phase Transformer Rectifier Eliminates Common Mode Ripple
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Solution Overview
Problem
Existing transformer-rectifier systems suffer from common mode ripple, which introduces undesirable noise in electrical systems and requires additional components like common mode inductors, increasing weight, cost, and reducing reliability.
Innovation Solution
A multi-phase transformer design with a single rectifier and multiple groups of windings, including primary, secondary, and tertiary windings, configured to convert three-phase low voltage AC to high voltage DC, eliminating common mode voltage and ripple by using a twenty-four pulse rectifier and specific winding configurations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional transformer-rectifier system is used, then it can convert AC to DC, but it generates common mode ripple which introduces noise and requires additional components
Solution Approach 1:
The patent divides the transformer into multiple independent winding groups (first group with primary windings, second group with secondary windings, third group with tertiary windings). Each group is magnetically coupled and operates semi-independently, allowing the cancellation of common mode ripple through proper phasing while maintaining the AC to DC conversion function.
Solution Approach 2:
The patent combines multiple winding groups with different voltage levels and phases into a single integrated transformer-rectifier system. The primary, secondary, and tertiary windings are magnetically coupled and work together to produce multiple output voltages while eliminating common mode ripple, replacing what would traditionally require separate transformers and additional filtering components.
2Object-affected harmful factors
If additional components like common mode inductors are added to reduce noise, then common mode ripple is reduced, but weight and cost increase
Solution Approach 1:
The patent extracts and eliminates the need for common mode inductors and additional filtering components by incorporating the ripple cancellation function directly into the transformer winding structure. The multi-group winding configuration inherently produces balanced currents that cancel common mode ripple, removing the need for separate noise-reduction components and thereby reducing system weight.
3Object-affected harmful factors
If additional components are added to eliminate common mode ripple, then noise is reduced, but system cost increases
Solution Approach 1:
The patent makes the transformer serve multiple functions: it performs voltage transformation, provides multiple output voltage levels (via primary, secondary, and tertiary windings), and eliminates common mode ripple simultaneously. This multi-functionality is achieved through the magnetic coupling of multiple winding groups with specific phasing, replacing what would traditionally require separate transformers, rectifiers, and filtering components, thereby reducing overall system complexity and cost.
4Object-affected harmful factors
If a multi-phase transformer with multiple winding groups is used, then common mode ripple is eliminated, but manufacturing complexity increases
Solution Approach 1:
The patent segments the complex multi-phase transformer into three distinct winding groups (primary, secondary, tertiary) that can be manufactured and assembled relatively independently. Each group has a defined number of phases and connections, making the manufacturing process more manageable compared to attempting to wind all phases in a single complex structure, while still achieving the ripple cancellation benefit.
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
This design effectively eliminates common mode ripple, reduces system weight and cost, and enhances the reliability of transformer-rectifier systems by generating high voltage DC without introducing common mode noise, improving the quality of the DC output.
Implementation Method 1
A multi-phase transformer design with a single rectifier and multiple groups of windings, including primary, secondary, and tertiary windings, configured to convert three-phase low voltage AC to high voltage DC
Implementation Method 2
A rectifier is an electrical device that converts AC into DC
Data Source
AI summary
A multi-phase transformer. The multi-phase transformer includes a single rectifier; and a plurality of groups of windings connected to the single rectifier. Each one of the plurality of groups of windings comprises: a corresponding plurality of primary windings having a first output voltage; a corresponding plurality of secondary windings having a second output voltage; and a corresponding plurality of tertiary windings having a third output voltage that is higher than the second output voltage.