Wireless Power Receiver Input Circuit for DC Overvoltage Control
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Solution Overview
Problem
Wireless power receivers are often incompatible with different wireless power transmitters, leading to potential damage from induced higher voltages, and existing solutions for protection involve complex components that increase losses and costs.
Innovation Solution
An input circuit for a wireless power receiver featuring an active rectifier with a voltage regulator and dual control loops, where a fast first control loop and a slower second control loop work together to manage DC voltage, protecting the circuit from overvoltage and overcurrent by actively regulating the DC voltage and adjusting the conduction angle of semiconductors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protection solutions are implemented to prevent damage from higher induced voltages, then reliability is improved, but device complexity increases and additional component costs are incurred
Solution Approach 1:
The patent combines the voltage regulation function with the existing active rectifier circuit by using the same controllable semiconductors (MOSFETs) for both rectification and voltage regulation. The control unit adjusts the conduction angle of the semiconductors to regulate DC voltage, eliminating the need for separate protection components and reducing circuit complexity while maintaining reliability.
Solution Approach 2:
The patent changes the operational parameters of the active rectifier by dynamically adjusting the conduction angle of the controllable semiconductors based on the detected voltage level. When higher induced voltage is detected, the control unit reduces the conduction angle to limit the average current and regulate the DC voltage, providing protection without additional hardware.
2Reliability
If conventional protection solutions are implemented to prevent damage from higher induced voltages, then reliability is improved, but energy losses increase
Solution Approach 1:
The patent merges the voltage regulation function into the active rectifier circuit, using the same controllable semiconductors for both rectification and protection. This eliminates the need for separate protection components that would dissipate power, reducing energy losses while maintaining protection capability through efficient conduction angle control.
3Manufacturing precision
If wireless power receiver is designed for specific power range and frequency, then manufacturing precision is improved, but adaptability to different transmitters deteriorates
Solution Approach 1:
The patent implements dynamic voltage regulation by continuously monitoring the induced voltage and adjusting the conduction angle of the controllable semiconductors in real-time. This dynamic adaptation allows the receiver to maintain safe operating parameters across different transmitter types and power ranges, enhancing compatibility while preserving design specifications through active control.
Solution Approach 2:
The patent changes the operational parameters of the rectifier circuit by adjusting the conduction angle of the semiconductors based on the characteristics of the connected transmitter. This parameter adjustment enables the receiver to adapt to different power ranges and frequencies while maintaining reliable operation and protection.
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 effectively protects the wireless power receiver from damage by quickly responding to voltage fluctuations, reducing power dissipation, and enhancing interoperability without additional component costs.
Implementation Method 1
a receiver coil configured to receive electrical energy via inductive coupling from a transmitter device external to the wireless power receiver
Data Source
AI summary
The invention relates to an input circuit (9) for a wireless power receiver (10), the input circuit (9) comprises:an active rectifier (5) configured with output nodes;a voltage regulator (7) connected to the output nodes, wherein the active rectifier (5) is configurated to output a DC voltage (VDC) at the output nodes, wherein the voltage regulator (7) is arranged to actively affect the said DC voltage (VDC);a control structure adapted to control the DC voltage (VDC), wherein the control structure comprises a first control loop operatively coupled to the voltage regulator (7) and configured to control a voltage regulation operation of the voltage regulator (7), and a second control loop operatively coupled to the active rectifier (5) and configured to control a rectifier operation of the active rectifier (5), operates with a faster response time (more than two order of magnitude faster) than the second control loop, and wherein the first control loop is operably engaged with the second control loop.The invention also relates to a wireless power receiver (10) and a method for operating the wireless power receiver (10).