Voltage Compensation Logic for Wireless Power Receiver
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Solution Overview
Problem
Voltage variations in wireless charging systems lead to inefficiencies and design constraints, particularly due to spatial freedom of device placement, which can result in large rectified receiver voltage variations, violating standard specifications.
Innovation Solution
The implementation of voltage compensation logic, including capacitors in a feedback loop and current source-based solutions, to reduce voltage variations in wireless charging systems, ensuring compliance with standards like A4WP by regulating rectified voltage within predefined ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If spatial freedom of device placement is allowed in wireless charging systems, then ease of operation is improved, but voltage variation increases causing compliance issues
Solution Approach 1:
The patent implements a feedback mechanism using a feedback capacitor connected in parallel with the rectifier output. The capacitor value is selected based on the rectified voltage and load current to provide automatic voltage regulation. As voltage varies due to placement changes, the feedback capacitor adjusts the rectifier output voltage accordingly, maintaining compliance with wireless charging standards while allowing spatial freedom.
Solution Approach 2:
The patent changes the electrical parameters (capacitance value, resistance value) of the feedback network components to optimize voltage regulation across different operating conditions. By selecting specific ranges for feedback capacitor and resistor values based on expected voltage and current variations, the system maintains stable operation despite changes in device placement and coupling conditions.
2Reliability
If voltage compensation logic is added to reduce voltage variations, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The feedback-based voltage compensation uses a simple RC network connected to the rectifier output. The feedback capacitor and resistor form a voltage-dependent control mechanism that automatically adjusts the rectifier output without requiring complex control circuits or additional active components, thus maintaining voltage stability while minimizing added complexity.
Solution Approach 2:
The voltage compensation logic serves itself by using the rectifier's own output voltage to control the feedback network. The feedback capacitor and resistor automatically adjust the rectifier output based on the actual voltage and load conditions without requiring external control signals or complex processing, enabling self-regulation with minimal additional components.
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 approach effectively limits voltage variations, enabling efficient wireless charging within specified power ranges (0.5W to 1.1W) and maintaining field uniformity, thus enhancing design flexibility and compliance with wireless charging standards.
Implementation Method 1
reducing voltage variations may include driving a voltage controlled capacitor in parallel with a wireless power receiving coil
Implementation Method 2
initiating a current source that may be configured to limit a voltage range of the rectifier within a predefined range
Implementation Method 3
Magnetic resonance wireless charging may employ a magnetic coupling between the Tx coil and the Rx coil
Data Source
AI summary
Techniques for voltage regulation in a system, method, and apparatus are described herein. An apparatus for voltage regulation in a wireless power receiver may include a rectifier having an output voltage. The apparatus may also include voltage compensation logic including at least one capacitor to reduce voltage variation of the output voltage from the rectifier.