Resonant Conversion Circuit Magnetic Core Integration
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Solution Overview
Problem
Existing interleaved and parallel-connected resonant conversion circuit units fail to achieve current sharing due to inconsistencies in resonant element parameters, leading to uneven current distribution and potential device damage.
Innovation Solution
Magnetic devices in resonant conversion circuit units are integrated on a shared magnetic core, enabling magnetic coupling and automatic current sharing between phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If two resonant conversion circuit units are connected in parallel to reduce ripple current, then the ripple current flowing through the filter capacitor is reduced, but current distribution becomes uneven due to parameter deviations, leading to potential device damage
Solution Approach 1:
The patent merges the magnetic devices (inductors) of multiple resonant conversion circuit units onto a single shared magnetic core. This integration creates magnetic coupling between the parallel-connected circuit units, enabling automatic current balancing without requiring complex control mechanisms. The magnetic coupling ensures that current distributes evenly across parallel units, preventing any single unit from being overloaded while maintaining the ripple current reduction benefit.
2Power
If resonant conversion circuit units are connected in parallel to achieve higher power output, then the power output capability is increased, but the current sharing between units becomes difficult to control
Solution Approach 1:
The patent implements a self-balancing mechanism where the magnetic coupling between integrated magnetic devices automatically regulates current distribution among parallel resonant conversion circuit units. The system self-adjusts to equalize current sharing without requiring external control circuits, sensors, or active management, thereby enabling high power output while maintaining simple device architecture.
3Reliability
If magnetic devices are integrated on a shared magnetic core, then current sharing is automatically achieved, but the manufacturing precision requirements for magnetic coupling are increased
Solution Approach 1:
The patent creates a magnetically equipotential environment by integrating all magnetic devices on a shared magnetic core. This configuration ensures that magnetic flux paths are symmetric and equivalent for all parallel resonant conversion circuit units, automatically equalizing current distribution. The shared magnetic core provides a uniform magnetic potential that compensates for minor manufacturing variations in individual magnetic components.
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 solution ensures balanced current distribution between phases without complex control mechanisms, reduces device parameter precision requirements, and minimizes circuit volume, enhancing the reliability and power density of the power converter.
Implementation Method 1
Magnetic devices in the resonant conversion circuit units are integrated on a same magnetic core in an inter-phase manner
Implementation Method 2
the energy of the power supply is transferred through a primary side of the transformer to a secondary side of the transformer
Data Source
Figure 1~2
Figure 3(a)
Figure 3(b)
AI summary
Embodiments of the present invention provide a resonant conversion circuit, including: resonant conversion circuit units having at least two phases interleaved in parallel, where magnetic devices in the resonant conversion circuit units are magnetically integrated in an inter-phase manner on a same magnetic core. Because a magnetic coupling action exists between the magnetic devices integrated on the same magnetic core, automatic current sharing effect is produced on currents in circuit branches of different phases. In this way, current sharing of the resonant conversion circuit units of various phases is achieved, and the volume of a power supply is reduced because of integration of the magnetic devices.