Center-Tapped Rectifier Circuit for Wireless Power Loss Balancing
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Solution Overview
Problem
Center-tapped rectifiers in wireless power transmission circuits face inefficiencies due to differences in coupling coefficients and leakage inductance between reception coils, leading to lopsided losses and requiring more coils and diodes, which increases size and cost.
Innovation Solution
The design converts a full-bridge rectifier circuit into a center-tapped rectifier circuit by using two reception coils and two transmission coils, connected in parallel and series respectively, with capacitors and diodes arranged to minimize leakage inductance differences and reduce the number of diodes required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a center-tapped rectifier is used with two reception coils, then the circuit can operate in low output voltage and high output current applications, but the coupling coefficients and leakage inductance differences cause lopsided losses and increased device complexity
Solution Approach 1:
The patent merges two separate reception coils into a single reception coil structure, eliminating the need for two coils and their associated diodes. This combining approach maintains the high output current capability while reducing the lopsided losses issue and simplifying the overall circuit structure.
Solution Approach 2:
The single reception coil is designed to perform multiple functions that were previously distributed across two coils, including handling both half-cycles of the AC waveform and providing the necessary inductance for high current operation, thereby reducing device complexity while maintaining power output capability.
2Device complexity
If a full-bridge rectifier is used, then the circuit structure is simpler, but the number of diodes required is higher increasing cost and device complexity
Solution Approach 1:
The patent extracts and eliminates two diodes from the traditional full-bridge rectifier configuration by using a single reception coil with optimized winding structure, reducing the component count and associated costs while maintaining the simplified circuit structure advantage.
3Power
If transmission coils are designed with more turns to enhance power transfer, then the power transfer capability increases, but the area and height of the coil structure increases
Solution Approach 1:
The patent employs a nested winding structure where multiple turns of the transmission coil are arranged in a compact, space-efficient manner. The coil windings are nested within each other in a three-dimensional configuration that maximizes the number of turns within a minimized footprint, enhancing power transfer without increasing area or height.
Solution Approach 2:
The patent transitions from a planar two-dimensional coil layout to a three-dimensional nested winding structure, utilizing the vertical dimension and spatial depth to accommodate more turns within the same footprint, thereby increasing power transfer capability without expanding the coil's area or height.
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 configuration reduces losses, saves costs by halving the number of diodes, and increases efficiency while allowing for more turns in transmission coils without increasing area or height, enhancing power transfer and reducing rectifier circuit size.
Implementation Method 1
a first diode connected in a forward direction from a first end of the first reception coil and to a second end of the first reception coil; a second diode connected in a forward direction from a first end of the second reception coil and to a second end of the second reception coil
Implementation Method 2
a first capacitor, wherein an input end of the first diode is connected to an output end of the second diode through the first capacitor
Implementation Method 3
a first transmission coil; and a second transmission coil connected in series with the first transmission coil, and the first transmission coil may be coupled to the first reception coil, and the second transmission coil may be coupled to the second reception coil
Data Source
AI summary
An electronic device includes a rectifier circuit including: a first reception coil; a second reception coil; a first diode connected in a forward direction from a first end of the first reception coil and to a second end of the first reception coil; a second diode connected in a forward direction from a first end of the second reception coil and to a second end of the second reception coil; and a first capacitor, wherein an input end of the first diode is connected to an output end of the second diode through the first capacitor.