Transformer Leakage Inductance Control via Closed-Loop Winding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Leakage inductance in electrical transformers causes periodic voltage drops, interfering with voltage supply regulation and posing a significant problem in power conversion circuits, particularly in systems with large energy storage and filtering components.
Innovation Solution
A closed-loop conductive winding is disposed around a transformer within a magnetic field to resist changes in the field, controlling leakage inductance, with options for single or multiple windings and the inclusion of resistors to adjust and tune the leakage inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed-loop conductive winding is added to control leakage inductance, then voltage supply consistency is improved, but device complexity increases
Solution Approach 1:
A closed-loop conductive winding is introduced as an intermediary element between the primary and secondary coils. This winding acts as a mediator that couples the magnetic fields of both coils, thereby controlling leakage inductance and improving voltage supply consistency without requiring fundamental changes to the transformer structure.
Solution Approach 2:
The leakage inductance is controlled by changing the physical parameters of the closed-loop winding, such as the number of turns, wire gauge, and positioning relative to the primary and secondary coils. By adjusting these parameters, the desired level of leakage inductance control can be achieved to maintain consistent voltage supply.
2Reliability
If multiple windings are used in the closed loop to inhibit larger leakage inductance, then leakage inductance control is improved, but manufacturing complexity increases
Solution Approach 1:
The closed-loop winding is segmented into multiple discrete turns or sections that can be independently controlled. Each segment contributes to the overall leakage inductance control, allowing for fine-tuned adjustment of the magnetic coupling between primary and secondary coils while maintaining manageable manufacturing complexity.
Solution Approach 2:
The closed-loop winding is positioned nested between the primary and secondary coils, with each winding layer strategically placed to optimize magnetic coupling. This nested arrangement allows multiple windings to be incorporated in a compact space, improving leakage inductance control without proportionally increasing manufacturing complexity.
3Adaptability or versatility
If a resistor is added in series with the closed loop to adjust leakage inductance, then leakage inductance tuning capability is improved, but device complexity increases
Solution Approach 1:
A resistor is added in series with the closed-loop winding to create a dynamically adjustable leakage inductance control mechanism. By varying the resistance value, the tuning capability of the leakage inductance is enhanced, allowing the transformer to adapt to different operating conditions and load requirements.
Solution Approach 2:
The series resistor provides an additional parameter (resistance value) that can be adjusted to fine-tune the leakage inductance characteristics. This parameter change enables precise control over the magnetic coupling and voltage regulation, improving adaptability while adding only a single component to the device.
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 closed-loop conductive winding effectively reduces leakage inductance, ensuring a consistent voltage supply and reliable performance in electrical transformers, with the ability to selectively inhibit varying degrees of leakage inductance.
Implementation Method 1
One or more conductive windings in a closed loop disposed around a transformer across a magnetic field may be used to control leakage inductance and its effects. The closed loop windings resist changes in the field, thereby controlling leakage inductance.
Data Source
AI summary
According to an embodiment, a transformer is provided that includes a first conductive coil wound about a first coil axis and a second conductive coil wound about a second coil axis. The second conductive coil is disposed proximate to the first conductive coil and the second coil axis is substantially parallel to the first coil axis. A closed-loop conductive winding is disposed proximate to the first conductive coil and the second conductive coil. The closed-loop conductive winding is wound about a loop axis at least one time where the loop axis is substantially parallel to the first coil axis and the second coil axis.