Wireless Power Receiver Ripple Suppression via Dynamic Element Adjustment
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Solution Overview
Problem
Conventional wireless power receivers experience output voltage ripple due to load modulation, which can reduce efficiency and requires additional components like regulators to mitigate, but these regulators further decrease efficiency.
Innovation Solution
A wireless power receiver design that includes a controller to monitor and suppress ripple by adjusting element values in the power receiver and modulator, such as changing resistance or capacitance, without using a regulator, thereby maintaining efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a regulator is added to reduce ripple in output voltage, then the ripple is reduced, but the total efficiency is undesirably reduced
Solution Approach 1:
The invention extracts and eliminates the regulator component from the wireless power receiver system. By removing the regulator that caused efficiency losses, the system achieves both ripple suppression through alternative means (load modulation optimization) and improved overall efficiency, directly resolving the contradiction between ripple reduction and energy loss.
Solution Approach 2:
The invention converts the harmful effect of load modulation (which causes ripple) into a beneficial approach by optimizing the load modulation technique itself. Instead of using regulation to suppress ripple, the system optimizes the timing and characteristics of load modulation to inherently minimize ripple generation, thereby eliminating the need for efficiency-reducing regulators.
2Loss of information
If load modulation is used for communication between wireless power transmitter and receiver, then communication is enabled, but ripple occurs in output voltage
Solution Approach 1:
The invention applies dynamic control to the load modulation process by adjusting the timing, duration, and amplitude of load modulation events based on communication requirements. This dynamic optimization allows the system to maintain effective communication while minimizing the ripple-generating aspects of load modulation, achieving both communication capability and reduced voltage ripple.
Solution Approach 2:
The invention changes key parameters of the load modulation technique, such as modulation depth, frequency, and duty cycle, to optimize the balance between communication effectiveness and ripple generation. By carefully selecting and adjusting these parameters, the system achieves reliable communication with minimal impact on output voltage stability.
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
Effectively suppresses ripple in the output voltage without the need for additional regulators, enhancing the overall efficiency of wireless power transfer.
Implementation Method 1
An electromagnetic induction-based power transmission method is used to transmit power between a primary coil and a secondary coil. Specifically, an induced current is generated as a magnet moves around a coil, or vice versa.
Implementation Method 2
The resonance scheme uses a resonance concept of physics that, if a tuning fork rings or resonates, a nearby wine glass may also ring at the same frequency. The resonance scheme causes electromagnetic waves containing electric energy to resonate
Implementation Method 3
A rectifier converts the received AC wireless power to DC power
Data Source
Figure 1~2
Figure 3A~3B
Figure 4
AI summary
A wireless power receiver (210) that receives wireless power from a wireless power transmitter and a control method thereof are provided, wherein the wireless power receiver receives (S501) the wireless power from the wireless power transmitter; rectifies (220) the wireless power (S503); determines (S505) whether a ripple of a voltage value of the wireless power is greater than or equal to a preset threshold; and if the ripple of the voltage value of the wireless power is greater than or equal to the preset threshold, changes (S507)at least one element value of the wireless power receiver to suppress the ripple below the preset threshold.