Modular Wireless Power Output Circuitry for Lower Rectifier Losses
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Wireless power transmission systems face inefficiencies in electrical performance at the mobile side due to increased losses as output current flows through compensation capacitors and rectifier elements, degrading electrical performance.
Innovation Solution
A modular output structure at the mobile side with a resonant circuit, transformer stage, and rectifier stage, along with a current transformer for monitoring output current, and a controller for synchronous AC/DC converters to optimize power delivery and reduce losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If output current flows through compensation capacitors and rectifier elements at the mobile side, then power delivery is enabled, but electrical performance degrades due to increased losses
Solution Approach 1:
The output circuitry is divided into multiple parallel output groups, with each group containing series-connected rectifier elements and compensation capacitors. This segmentation distributes the total output current across multiple parallel paths, reducing the current burden on each individual component and thereby reducing power losses and thermal loads while maintaining overall system reliability.
2Power
If multiple AC/DC converters are connected in series to increase output voltage, then power delivery capability improves, but current flow through each converter decreases, affecting power transfer efficiency
Solution Approach 1:
The system uses multiple AC/DC converters arranged in series within each output group, segmenting the voltage generation function. This allows the system to achieve high output voltage while maintaining reasonable current levels through each converter by distributing the voltage conversion task across multiple parallel groups.
Solution Approach 2:
The patent introduces a transformer stage as an intermediary between the resonant circuit and the rectifier stage. This transformer enables galvanic decoupling and provides impedance matching, allowing efficient power transfer while maintaining the desired voltage and current characteristics through the intermediate transformation stage.
3Device complexity
If a single large AC/DC converter is used to handle high power, then device complexity is reduced, but thermal load and power losses increase significantly
Solution Approach 1:
Instead of using a single large AC/DC converter, the patent segments the power conversion function into multiple smaller AC/DC converters arranged in parallel output groups. This distribution of power handling across multiple components reduces the thermal load on each individual converter while maintaining the total power conversion capability, and also provides better heat dissipation distribution.
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 solution improves electrical performance by reducing current flow through capacitors and rectifiers, enhancing power transfer efficiency and reducing thermal loads, while allowing for accurate monitoring and control of output current.
Implementation Method 1
a mobile side resonant circuit adapted to inductively couple the mobile side circuitry to a stationary side circuitry
Implementation Method 2
the mobile side transformer stage comprises at least one primary side winding and a plurality of secondary side windings
Implementation Method 3
a mobile side rectifier stage adapted to rectify an input signal for supply of power to a mobile side load
Data Source
AI summary
Efficient measures to improve electrical performance in a mobile side output circuitry of a wireless power transmission system are provided. The mobile side circuitry of the wireless power transmission system has a mobile side transformer stage comprising at least one primary side winding and a plurality of secondary side windings. To the plurality of secondary side windings there are connected a plurality of mobile side AC/DC converters. According to a first alternative of the present invention output terminal pairs of the plurality of mobile side AC/DC converters are connected in series. According to a second alternative of the present invention output terminal pairs of the plurality of mobile side AC/DC converters are connected in parallel. According to a third alternative of the present invention mobile side AC/DC converters are grouped into a plurality of mobile side output groups such that output terminal pairs within each mobile side output group are connected in series and output terminal pairs of different mobile side output groups are connected in parallel.