Wireless Power Receiver Duty-Cycle Control for Source Overload Prevention
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Solution Overview
Problem
Existing contactless power feeder systems face challenges in efficiently supplying power to multiple movable bodies with high electric loads simultaneously, leading to potential overload of the power source and reduced operating efficiency in facilities like article transport facilities.
Innovation Solution
A power receiver system with a pickup coil, rectifier, chopper, controller, voltage detector, and current detector that regulates the on-duty cycle of the chopper to ensure power less than or equal to a preset power is supplied to the electric load, preventing overload and allowing multiple movable bodies with high electric loads to operate simultaneously.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the controller increases the output voltage at a normal rate of increase to respond to high electric load, then the power receiver can maintain adequate voltage supply, but the power source may be overloaded when multiple movable bodies have high electric loads simultaneously
Solution Approach 1:
The controller implements feedback control by detecting the output current and comparing it with a threshold value, then adjusting the on-duty cycle of the switching element accordingly. When the detected current exceeds the threshold, the controller reduces the on-duty cycle to limit power consumption, preventing power source overload while maintaining system reliability.
Solution Approach 2:
The system dynamically adjusts the on-duty cycle of the switching element based on real-time current detection. The controller modifies the duty cycle proportionally to the excess current amount, enabling adaptive power management that responds to changing load conditions and prevents overload without sacrificing necessary power supply.
2Productivity
If multiple movable bodies operate simultaneously with high electric loads, then the facility operating rate is maintained, but the power source becomes overloaded
Solution Approach 1:
Each movable body's controller independently monitors its own output current and adjusts its power consumption through feedback control. This enables multiple movable bodies to operate simultaneously at high load without causing system-wide overload, as each unit self-regulates its power draw based on real-time conditions.
Solution Approach 2:
The power receiver in each movable body autonomously manages its own power consumption by detecting current levels and adjusting the switching element's on-duty cycle accordingly. This self-service mechanism allows each unit to contribute to overall system stability without requiring centralized coordination, enabling high facility operating rates.
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 effectively manages power distribution to multiple movable bodies with high electric loads, preventing power source overload and maintaining facility efficiency by controlling the on-duty cycle of the chopper based on detected voltage and current, ensuring stable power supply.
Implementation Method 1
a pickup coil that generates an induced electromotive force using an alternating current flowing through the feed line
Data Source
AI summary
A power receiver includes a pickup coil, a rectifier, a chopper, a controller that controls an on-duty cycle of a switching element in the chopper, a voltage detector that detects an output voltage, and a current detector that detects an output current. The controller controls the on-duty cycle of the switching element based on the output voltage and the output current to cause power less than or equal to a preset power to be supplied to an electric load.