Wireless Charging Receiver Active Rectifier Efficiency
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Solution Overview
Problem
Existing wireless charging receivers have inefficiencies in power transfer due to two-stage power processing, which degrades system efficiency, increases volume, and costs, and are not scalable for high-power applications, with conventional systems using passive diodes and requiring manual mode selection between continuous and discontinuous conduction modes.
Innovation Solution
A wireless charging receiver with a configurable rectifier using active diodes and a controller for mode cycling schemes, enabling one-stage power conversion and voltage regulation, and adaptive delay compensation for active diodes to reduce propagation delays, allowing for efficient power transfer and scalable high-power applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If two-stage power processing is used in wireless charging receivers, then power conversion can be achieved, but system efficiency is degraded and volume increases
Solution Approach 1:
The patent combines the rectification stage and power regulation stage into a single integrated circuit chip. The receiver includes a rectifier circuit and a power regulation circuit both integrated on the same chip, eliminating the need for separate discrete components and reducing overall system volume while maintaining efficient power conversion.
Solution Approach 2:
The integrated receiver chip performs multiple functions including rectification, voltage regulation, and power management within a single device. This multi-functional integration reduces the number of separate components needed, thereby reducing system volume and improving power transfer efficiency by eliminating inter-component losses.
2Loss of energy
If two-stage power processing is used in wireless charging receivers, then power conversion can be achieved, but production cost increases
Solution Approach 1:
The patent integrates multiple power processing functions into a single chip, reducing the number of discrete components that need to be assembled and tested. This integration simplifies the manufacturing process, reduces assembly steps, and lowers production costs while maintaining efficient power conversion.
Solution Approach 2:
The patent employs mode cycling schemes that dynamically adjust operating parameters to optimize efficiency across different power levels. This allows the system to maintain high efficiency without requiring complex hardware, thereby reducing production costs through software-controlled optimization rather than hardware complexity.
3Device complexity
If passive diodes are used in wireless charging receivers, then simple circuit implementation is achieved, but propagation delays occur and efficiency is reduced
Solution Approach 1:
The patent replaces passive diodes with active switching elements (transistors) controlled by a controller. This substitution eliminates the inherent propagation delays and voltage drops associated with passive diodes, improving power transfer efficiency while the controller manages the switching operations to maintain circuit simplicity.
Solution Approach 2:
The active diode circuitry automatically adjusts its operation based on real-time conditions, with the controller dynamically managing the switching elements to optimize performance. This self-adjusting capability eliminates the need for manual mode selection and compensates for delays without adding significant circuit complexity.
4Reliability
If manual mode selection between continuous and discontinuous conduction modes is required, then circuit operation can be controlled, but ease of operation is reduced and time is lost
Solution Approach 1:
The controller automatically detects the operating conditions and autonomously selects the appropriate conduction mode (continuous or discontinuous) without requiring manual intervention. This self-service capability maintains reliable operation control while significantly improving ease of operation by eliminating manual mode selection.
Solution Approach 2:
The controller dynamically adjusts operating parameters including conduction mode based on real-time feedback from the power transfer process. This adaptive parameter adjustment allows the system to automatically optimize performance across varying conditions without requiring user input, thereby maintaining reliability while improving ease of operation.
5Device complexity
If conventional rectifier circuits are used, then simple design is achieved, but output voltage ripples are high and efficiency is reduced
Solution Approach 1:
The patent replaces conventional passive rectifier circuits with an active rectification implementation using controlled switching elements. This substitution reduces output voltage ripples and improves efficiency by allowing precise control of the rectification process, while the integrated design keeps overall complexity manageable.
Solution Approach 2:
The controller dynamically adjusts switching parameters and timing to optimize rectification performance across different operating conditions. This adaptive parameter control reduces voltage ripples and improves efficiency without requiring a fundamentally more complex rectifier design, as the optimization is achieved through intelligent control rather than hardware complexity.
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 achieves higher power efficiency, reduces output voltage ripples, and decreases silicon area and production costs, enabling efficient and scalable wireless charging for various applications, including high-power scenarios.
Implementation Method 1
WPT is generally achieved via the use of inductive coils, e.g., a power transmitter transfers power via a primary coil to a secondary coil at a power receiver
Implementation Method 2
The configurable rectifier includes one or more diodes. The wireless charging receiver additionally includes a controller communicatively coupled to the one or more diodes
Data Source
AI summary
A wireless charging receiver as described herein includes a configurable rectifier configured to convert an alternating current input to a direct current output in a single processing stage, wherein the configurable rectifier comprises one or more diodes, and a controller communicatively coupled to the one or more diodes and configured to select one of a plurality of mode cycling schemes and control a present operating mode of the active diodes according to a selected mode cycling scheme. Additionally, an active diode as described herein includes a comparator, a gate driver, a power transistor, and a delay compensation circuit for compensation of at least one of a turn-on delay and a turn-off delay of the active diode, the delay compensation circuit including analog feedback loops.