Wireless Power Transmitter Duty Cycle Control
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Solution Overview
Problem
Existing wireless power transmission systems face challenges in efficiently adapting power transmission based on varying distances and alignments between transmitters and receivers, as well as the state of charge of batteries, leading to inefficiencies and potential overheating.
Innovation Solution
A wireless power transmitter with a controller that adjusts the duty cycle and frequency of control signals to operate in different modes (normal, boost, and reduction modes) based on the distance, alignment, and battery charge level, using a bridge circuit with switching elements and a resonator to optimize power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the wireless power transmitter operates at high power levels to meet varying power requirements, then the power delivery capability is improved, but overheating and efficiency loss occur
Solution Approach 1:
The patent implements dynamic operation modes (normal mode, boost mode, and reduction mode) that allow the wireless power transmitter to adapt its power transmission characteristics in real-time. The controller dynamically adjusts operating parameters including duty cycle and frequency based on detected conditions such as distance, alignment, and battery charge level, enabling the system to optimize power delivery while preventing overheating and efficiency loss.
2Loss of energy
If the system continuously monitors and adjusts power transmission parameters to optimize efficiency, then the power transmission efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes power transmission efficiency by dynamically changing key operating parameters including the duty cycle and frequency of control signals. The controller adjusts these parameters based on feedback from the wireless power receiver and detection of transmission conditions. This parameter-based control approach enables efficient power transfer without requiring complex additional hardware, as it leverages the existing bridge circuit and resonator components.
3Adaptability or versatility
If the wireless power transmitter adapts to varying distances and alignments between transmitter and receiver, then the adaptability is improved, but the control system complexity increases
Solution Approach 1:
The patent implements a feedback mechanism where the controller receives signals from the wireless power receiver indicating power requirements and transmission conditions. Based on this feedback, the controller automatically adjusts operating parameters including switching duty cycle and frequency to compensate for variations in distance and alignment between transmitter and receiver. This feedback-based adaptation enables the system to maintain efficient power transfer across varying operational conditions without requiring complex manual intervention or additional sensing hardware.
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 system ensures stable and efficient power transmission by adjusting parameters to meet the required power levels, preventing overheating and improving user convenience by optimizing power delivery according to changing conditions.
Implementation Method 1
a resonator including a resonant capacitor and a resonant coil, and configured to receive the AC voltage to transmit power wirelessly
Implementation Method 2
a converter including switching elements forming a bridge circuit, and configured to output an alternating current (AC) voltage in response to control signals
Data Source
AI summary
A wireless power transmitter includes: a converter including switching elements forming a bridge circuit and configured to output an alternating current (AC) voltage in response to control signals; a resonator including a resonant capacitor and a resonant coil, and configured to receive the AC voltage to transmit power wirelessly; and a controller configured to set a dead time at which a magnitude of the AC voltage is substantially zero in response to a signal received from a wireless power receiver.