Polyphase AC-DC Converter With Averaging Magnetic Element
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Solution Overview
Problem
Conventional DC switching regulators face significant challenges with inductor size, cost, and power loss, which are exacerbated by the use of polyphase configurations, while capacitors have seen modest progress and remain relatively efficient.
Innovation Solution
The integration of an averaging transformer and inductance in a magnetic element replaces multiple inductors, reducing overall size, cost, and power loss by mathematically averaging phase signals and minimizing ripple volt-seconds, thereby allowing for reduced inductance requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple inductors are used in polyphase configurations, then current harmonic cancellation is achieved, but overall size, cost, and power loss increase
Solution Approach 1:
The patent combines multiple inductors into a single shared magnetic element that serves all polyphase configurations. This magnetic element is coupled to the secondary side of a transformer and provides the necessary inductance for multiple phases without requiring separate inductors for each phase, thereby achieving current harmonic cancellation while reducing overall size and cost.
Solution Approach 2:
The shared magnetic element performs multiple functions simultaneously: it provides inductance for multiple polyphase configurations, enables current harmonic cancellation across all phases, and reduces the total component count. This universal component replaces what would traditionally require multiple separate inductors, addressing both the reliability and size contradictions.
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 approach significantly reduces the size, cost, and power loss of DC switching regulators by utilizing an averaging transformer and inductance, enabling faster response times and improved efficiency in power conversion applications.
Implementation Method 1
The new approach uses transformer action to mathematically average the n number of phase signals
Implementation Method 2
Since core saturation (Bm) must occur at currents which are greater than the rated current, it then follows that the flux swing must be less than 0.5*Bm for such inductors
Data Source
AI summary
A system including a polyphase regulator. In some embodiments, the system includes: a first magnetic element, n switching poles, n being an integer greater than 2, a first port having a first node and a second node, and a second port having a first node and a second node. The first magnetic element may include n phase ports and an averaging port, and each of the n switching poles may include a phase node.