Active Rectifier Input Circuit for Wireless Power Overvoltage
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Solution Overview
Problem
Wireless power receivers are vulnerable to damage due to incompatibility with wireless power transmitters, leading to higher induced voltages, and existing solutions to mitigate this often result in additional losses and increased component costs, which is undesirable for high-volume production.
Innovation Solution
An input circuit for wireless power receivers featuring an active rectifier with a voltage regulator and control structure, including a high-reactivity first control loop for voltage regulation and a second control loop for rectifier operation, which can adapt the DC voltage and conduction angle to manage overvoltage and overcurrent, thereby protecting the receiver and ensuring interoperability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wireless power receiver is combined with an incompatible wireless power transmitter, then the wireless power receiver can be damaged because the induced voltage by the incompatible wireless power transmitter may lead to higher voltages or an increased power transfer, but existing solutions to mitigate this often result in additional losses and increased component costs
Solution Approach 1:
The patent applies preliminary action by implementing a control structure that proactively monitors and regulates voltage before damage can occur. The system uses a voltage sensor to detect voltage levels and a control unit to adjust the impedance of the input circuit, preventing overvoltage damage before it happens rather than reacting after damage occurs.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the impedance of the input circuit based on detected voltage levels. The control unit modifies circuit parameters (impedance) in response to voltage conditions, allowing the system to adapt to different transmitter types and prevent damage without requiring complex additional components.
2Reliability
If complex solutions are used to reduce the risk of damages caused by induction of higher voltages, then protection is improved, but additional losses and costs for additional components increase
Solution Approach 1:
The patent applies universality by designing an input circuit with multi-functional components. The impedance-controlled input circuit serves both as a power reception pathway and as a protective element. The control structure integrates voltage sensing, analysis, and impedance adjustment functions into a unified system that works across different transmitter types without requiring transmitter-specific hardware.
Solution Approach 2:
The patent applies self-service by implementing a self-regulating system where the wireless power receiver automatically detects voltage conditions and adjusts its own impedance to prevent damage. The control unit uses feedback from the voltage sensor to autonomously modify circuit parameters without external intervention or complex external protection circuits.
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 overvoltage and overcurrent, reduces power losses, and enhances interoperability by actively controlling the DC voltage and conduction angle, preventing damage and maintaining efficient energy transfer.
Implementation Method 1
a receiver coil (Lrx) configured to receive electrical energy via inductive coupling from a transmitter device external to the wireless power receiver
Data Source
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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 (Voc) at the output nodes, wherein the voltage regulator (7) is arranged to actively affect the said DC voltage (Voc); - a control structure adapted to control the DC voltage (Voc), 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), wherein the first control loop is adapted with a higher reactivity than the second control loop. The invention also relates to a wireless power receiver (10) and a method for operating the wireless power receiver (10).