Wireless Power Receiver Dump Circuit Stabilization
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Solution Overview
Problem
In wireless power supply systems, especially those following the PMA standard, the instability and precision issues arise during light load or non-load states due to variations in the resistance value of the dump resistor, leading to errors in calculating received power and current flow, which affects system stability and precision in power measurement.
Innovation Solution
A wireless power receiver apparatus is designed with a dump circuit that generates a first and second dump current, using current sources instead of resistors, and a current detection circuit to accurately detect currents and generate precise current detection signals, stabilizing the system and improving precision in power measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dump resistor is used to sink dump current in light load or non-load states, then the rectifier circuit stability is improved, but the resistance value variations cause errors in current and power measurement precision
Solution Approach 1:
The invention changes the parameter of the dump circuit from using a fixed resistor to using a controlled current source that can dynamically adjust its output current. This allows the dump current to be precisely controlled and measured, eliminating the measurement errors caused by resistor value variations while maintaining circuit stability in light load or non-load states.
2Adaptability or versatility
If the resistance value of the dump resistor varies, then the dump current changes, but this leads to errors in calculating received power and affects system stability
Solution Approach 1:
The invention introduces a feedback mechanism where the controller measures the actual dump current and uses this information to calculate the received power accurately. The feedback loop ensures that variations in dump current are compensated for, maintaining system stability and measurement accuracy despite changes in load conditions.
3Reliability
If a dump circuit is added to sink dump current, then the rectifier circuit stability is improved, but the device complexity increases
Solution Approach 1:
The invention designs the dump circuit to serve multiple functions: it sinks dump current to stabilize the rectifier circuit, provides a measurable current signal for power calculation, and acts as a controlled load. By integrating these functions into a single circuit block, the complexity increase is minimized while achieving multiple benefits.
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 solution enables high-precision detection of current and power consumption, stabilizes the system even in light load states, and improves the stability of the feedback loop, allowing for accurate power measurement and control, reducing errors and inrush currents.
Implementation Method 1
The reception coil 302 receives the electric power signal S2 from the transmission coil 202
Implementation Method 2
The rectifier circuit 304 and the smoothing capacitor 306 rectify and smooth a current IRX induced at the reception coil 302
Data Source
AI summary
A rectifier circuit rectifies the current that flows through a reception coil. A smoothing capacitor is coupled to the output of the rectifier circuit. A power supply circuit stabilizes the rectified voltage VRECT that occurs across the smoothing capacitor, and supplies the rectified voltage thus stabilized to a load. A dump circuit sinks the first dump current IDUMP from the output of the power supply circuit. A current detection circuit detects the current IOUT that flows through the power supply circuit, and generates a current detection signal S11 that indicates the amount of the current.