Wireless Power Transmitter Inverter Control for Load Impedance Stability
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Solution Overview
Problem
Conventional wireless power transmission systems face challenges in maintaining stable power supply when the load impedance changes, leading to potential malfunction or destruction of loads due to voltage fluctuations, especially in applications like industrial robots with frequently changing operational statuses.
Innovation Solution
A power transmitter with an inverter circuit and a control circuit that adjusts a control parameter based on input voltage and current measurements to maintain the output voltage within a predetermined range, using correlation data to swiftly respond to changes in load conditions, thereby stabilizing the power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional wireless power transmission is used, then power can be transmitted wirelessly, but stable power supply cannot be maintained when load impedance changes
Solution Approach 1:
The control circuit continuously monitors voltage and current measurements from the inverter circuit input and adjusts the control parameter based on this feedback. This closed-loop control enables the system to detect load impedance changes and respond by adjusting the inverter output to maintain stable power transmission, resolving the contradiction between reliable power supply and adaptability to load changes.
Solution Approach 2:
The system dynamically adjusts the control parameter of the inverter circuit based on real-time voltage and current measurements. This dynamic adaptation allows the wireless power transmission system to maintain stable operation despite varying load impedance conditions, transforming a static system into one that can respond to changing conditions.
2Reliability
If the control parameter is adjusted based on voltage and current measurements, then output voltage can be maintained within a predetermined range, but the system complexity increases
Solution Approach 1:
The control circuit uses feedback from voltage and current measurements to automatically adjust the control parameter, maintaining output voltage within the predetermined range. This feedback mechanism provides a systematic way to manage the complexity by using measured data to drive control decisions, ensuring voltage stability without requiring overly complex control logic.
Solution Approach 2:
The control circuit performs self-adjustment based on its own measurements of voltage and current, maintaining output stability autonomously. This self-service capability reduces the need for external intervention or more complex control systems, as the system uses its own operational data to regulate itself.
3Productivity
If the inverter circuit operates with changing load conditions, then power transmission continues, but voltage fluctuations cause load malfunction or destruction
Solution Approach 1:
The control circuit continuously monitors voltage and current measurements and adjusts the control parameter in response to detected changes, preventing voltage fluctuations from reaching harmful levels. This feedback control ensures continuous power transmission while protecting the load from voltage-related damage.
Solution Approach 2:
The control system anticipates potential voltage fluctuations by continuously monitoring measurements and makes preemptive adjustments to the control parameter, cushioning the load against harmful voltage variations before they can cause malfunction or destruction.
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 solution ensures a stable and safe operation of loads by maintaining the output voltage within a predetermined range, even with simultaneous changes in multiple loads, preventing malfunctions and ensuring continuous operation.
Implementation Method 1
an inverter circuit which converts input DC power into AC power and outputs the AC power
Implementation Method 2
a transmission antenna which is connected to the inverter circuit, and which sends out the AC power having been output from the inverter circuit
Data Source
AI summary
A power transmitter wirelessly transmits electric power to a power receiver that includes a reception antenna. The power transmitter includes: an inverter circuit; a transmission antenna which sends out the AC power having been output from the inverter circuit; and a control circuit which, based on measurement values of voltage and current to be input to the inverter circuit, determines a value of a control parameter defining an output voltage from the inverter circuit and controls the inverter circuit by using the determined value of the control parameter. When at least one of the measurement values of voltage and current to be input to the inverter circuit changes, the control circuit changes the value of the control parameter based on the measurement values of voltage and current so that a voltage to be output from the power receiving circuit is maintained within a predetermined range.