Magnetic Coupling Reactor Ripple Current Suppression
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Solution Overview
Problem
Boost converter circuits using magnetic coupling reactors face an issue where ripple current components of different phases synchronize, leading to increased ripple current in the filtering capacitor, resulting in larger capacitor sizes and higher manufacturing costs.
Innovation Solution
A power conversion device is designed with a magnetic coupling reactor where the coupling factor is adjusted to suppress ripple current flowing into the capacitor, achieved by controlling the magnetic coupling reactor's coupling factor to a value equal to or less than a set value, thereby reducing the size of the capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a magnetic coupling reactor with high coupling factor is used, then power conversion efficiency is improved, but ripple current in the capacitor increases leading to larger capacitor size
Solution Approach 1:
The invention changes the coupling factor parameter of the magnetic coupling reactor from a high value to a specific range (0.3 to 0.8), which optimizes the balance between power conversion efficiency and ripple current suppression, thereby reducing capacitor size without sacrificing too much efficiency
Solution Approach 2:
The invention introduces a feedback mechanism by measuring the ripple current in the capacitor and adjusting the coupling factor accordingly, using the relationship between coupling factor and ripple current to achieve optimal performance
2Loss of energy
If a magnetic coupling reactor with high coupling factor is used, then power conversion efficiency is improved, but manufacturing cost increases due to larger capacitor requirements
Solution Approach 1:
The invention changes the coupling factor parameter to a specific range (0.3 to 0.8) that reduces the required capacitor size, thereby lowering manufacturing costs while maintaining acceptable power conversion efficiency
3Volume of stationary object
If the coupling factor of the magnetic coupling reactor is reduced, then ripple current in the capacitor is suppressed, but the reactor design becomes more complex
Solution Approach 1:
The invention simplifies the reactor design by specifying a concrete coupling factor range (0.3 to 0.8) rather than requiring complex adaptive mechanisms, achieving ripple current suppression through parameter optimization alone
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 results in a compact, efficient power conversion device with reduced capacitor size and lower manufacturing costs by effectively managing the ripple current.
Implementation Method 1
a magnetic coupling reactor element (10) having a plurality of reactors (L1, L2) which are magnetically coupled to each other
Data Source
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AI summary
Provided is a power conversion device using a magnetic coupling reactor and being capable of reducing the number of parts and reducing the size of not only the magnetic coupling reactor but also an input capacitor. The magnetic coupling reactor is connected between a semiconductor switch element group, which executes power conversion, and the input capacitor. The coupling factor of two reactors in the magnetic coupling reactor is kept to a value equal to or less than a set value, for example, 0.8. The set value takes into consideration an area in which a ripple current of the input capacitor increases rapidly in response to a rise in coupling factor. The ripple current flowing in the input capacitor is reduced by thus setting the coupling factor.