Magnetically Coupled Inductor Power Circuit for Noise Suppression
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Solution Overview
Problem
Conventional power circuits that use interleaving methods to reduce noise frequencies fail to effectively suppress noise components equal to even multiples of the switching frequency, leading to increased circuit size and complexity, and potential malfunctions due to noise propagation.
Innovation Solution
A power circuit design that includes magnetically coupled inductors and a bypass capacitor, with a control circuit performing interleaving switching control, allowing for the cancellation of noise frequencies equal to odd multiples and even multiples of the switching frequency, thereby reducing normal mode noise effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If additional noise reduction measures are added, then noise suppression improves, but circuit complexity increases
Solution Approach 1:
The patent makes the switching control circuit perform multiple functions: it simultaneously achieves power factor correction and noise reduction across multiple frequency components. By controlling two phases with different frequencies, the same control circuit handles both the primary power conversion function and the secondary noise suppression function, avoiding the need for separate dedicated noise filtering circuits.
2Volume of stationary object
If circuit size is reduced, then compactness improves, but noise filtering capability may be compromised
Solution Approach 1:
The patent replaces traditional passive noise filtering components (such as large inductors and capacitors) with an active control approach using multiple switching frequencies. This substitution allows noise reduction to be achieved through control strategy rather than bulky passive components, thereby reducing circuit size while maintaining or improving noise filtering capability.
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 proposed power circuit design significantly reduces noise components across a broader range of frequencies, including those previously unaddressed by conventional methods, leading to a more compact and reliable noise reduction solution.
Implementation Method 1
the first inductor (Lc1) and the second inductor (Lp1) are magnetically coupled to each other
Implementation Method 2
a bypass circuit B having a bypass capacitor (Cb1) and a resonant frequency equal to two times a switching frequency (2×fsw)
Data Source
AI summary
Provided is a power circuit in which a first input terminal is connected to a first end of a second inductor, a second end of the second inductor is connected to a first end of a first reactor, the second end of the second inductor is connected to a first end of a second reactor, the first input terminal is connected to a first end of a first inductor, a second end of the first inductor is connected to a first end of a bypass capacitor, a second end of the bypass capacitor is connected to a second output terminal, the first inductor and the second inductor are magnetically coupled to each other, and a control circuit performs switching control over first and second switching elements, using an interleaving method.