Wireless Power Receiver Feedforward Current Control for Overcurrent Prevention
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Solution Overview
Problem
Conventional wireless power transfer technologies face responsiveness issues due to insufficient feedback control, leading to excessive received power and potential overcurrents, which can damage batteries or other loads.
Innovation Solution
A wireless power receiving device employing a power receiving unit, a power unit, a detection unit, a current switching unit, and a control unit that utilizes feedforward control to switch between first and second currents based on detected electrical characteristics, allowing for rapid adjustment of current supply to the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional feedback control is used to control supply current, then the control structure is simple, but the responsiveness is insufficient leading to excessive received power and potential overcurrents
Solution Approach 1:
The patent applies preliminary action by using feedforward control to anticipate and respond to power reception changes before they result in overcurrent conditions. The control unit calculates the required current supply in advance based on detected power reception characteristics, allowing the system to proactively adjust the current supply ratio and prevent excessive current before it damages the battery or load.
2Reliability
If conventional feedback control is used, then the control structure is simple, but overcurrents can occur that damage batteries or loads
Solution Approach 1:
The patent combines feedforward control with feedback mechanisms. The control unit continuously detects power reception characteristics and uses this information to adjust the current supply ratio dynamically. This hybrid approach provides reliable overcurrent protection by constantly monitoring system conditions and making real-time adjustments to prevent dangerous current levels while maintaining a manageable control structure.
Solution Approach 2:
The system applies preliminary anti-action by implementing control measures that prevent overcurrent conditions before they occur. The feedforward control mechanism anticipates potential overcurrent situations based on detected power reception characteristics and adjusts the current supply ratio in advance to counteract the harmful effect before it can damage the battery or load.
3Productivity
If the current supply is continuously adjusted to match load requirements, then the power delivery is optimized, but the control responsiveness to sudden power changes is insufficient
Solution Approach 1:
The patent resolves this contradiction by implementing preliminary action through feedforward control. The control unit detects power reception characteristics and calculates the appropriate current supply ratio in advance, enabling rapid response to sudden power changes. This allows the system to maintain optimized power delivery while simultaneously achieving fast control responsiveness, as the current supply is adjusted proactively rather than reactively.
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 feedforward control enables quick response to changes in power reception, preventing overcurrents and ensuring stable power delivery to the load, thereby protecting the battery and improving system responsiveness.
Implementation Method 1
a power receiving unit that includes a power receiving coil and receives AC power by magnetic coupling
Data Source
AI summary
At least a part of AC power received by a power receiving coil at a position where magnetic coupling with a power transmitting coil is possible is supplied from a circuit that functions as a current source to a load. At this time, an electrical characteristic of a current source in this circuit is detected, and switching between a first state of supplying a first current from the current source to the load and a second state of supplying a second current smaller than the first current from the current source to the load is performed to feedforward-control a ratio of the first state or the second state to one cycle of the AC power according to the detected electrical characteristic.