Wireless Power Receiver Dummy Load Control for Light Load Stability
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Solution Overview
Problem
Non-contact feed systems using magnetic fields face challenges in controlling receiving voltage during light loads, where the receiving current may be insufficient, leading to uncontrollable or overvoltage issues.
Innovation Solution
An electronic unit and feed system with a control section that increases the receiving current to a threshold level using a dummy load circuit when the receiving current is below a predetermined threshold, ensuring appropriate voltage control during light loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic resonance method is used for non-contact power supply, then coupling between power transmission side and power receiving side can be improved through resonance phenomenon, but receiving current becomes insufficient during light load conditions leading to uncontrollable or overvoltage issues
Solution Approach 1:
A dummy load circuit is introduced as an intermediary component to absorb excess power during light load conditions. The dummy load circuit includes a resistor and switching element that activate when receiving current is below a threshold level, providing a controlled path for power dissipation and preventing voltage instability.
Solution Approach 2:
The system dynamically changes the load parameters by switching between normal load and dummy load conditions. When receiving current drops below a threshold, the dummy load is activated to increase the total load, thereby maintaining receiving current above the threshold and preventing overvoltage conditions.
2Use of energy by moving object
If receiving current is allowed to be low during light load, then power consumption is reduced, but receiving voltage becomes uncontrollable and may exceed safe levels
Solution Approach 1:
The control section continuously monitors receiving current and compares it against a threshold value. When receiving current falls below the threshold during light load conditions, the control section activates the dummy load circuit to increase current consumption, thereby maintaining voltage control. This feedback mechanism ensures voltage stability while allowing energy savings during adequate load conditions.
Solution Approach 2:
The dummy load circuit is dynamically activated or deactivated based on real-time receiving current conditions. The switching element in the dummy load circuit changes state according to load requirements, providing adaptive power management that balances energy efficiency with voltage control reliability.
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 allows for effective control of receiving voltage even during light loads, preventing uncontrollable states and overvoltages, thereby ensuring stable power transmission in non-contact magnetic field-based feeding systems.
Implementation Method 1
a power receiving section configured to receive electric power fed from a feed unit by using a magnetic field
Data Source
AI summary
An electronic unit includes: a power receiving section configured to receive electric power fed from a feed unit by using a magnetic field; and a control section configured to perform, when a receiving current supplied from the power receiving section is less than a predetermined threshold current at a time of a light load, current increasing control to increase the receiving current to the threshold current or more.