Charge-Discharge Control for Contactless Power Systems
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Solution Overview
Problem
In contactless power-feeding systems, rapid changes in the gap between primary and secondary coils and load variations can lead to over-discharge and over-charge, causing instability and potential blackouts.
Innovation Solution
A charge-discharge control apparatus with a rectifier-voltage decrease detector and an over-discharge suppression controller circuit that detects voltage drops and adjusts the inverter circuit or battery charging to prevent over-discharge, ensuring stable power transmission using the magnetic-field resonant method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gap between primary and secondary coils varies or load changes, then power transmission flexibility is improved, but current changes rapidly causing over-discharge and over-charge
Solution Approach 1:
The patent implements a feedback control mechanism where the controller monitors the state of charge of the battery and the output of the power receiving device, then adjusts the charging current accordingly. When the battery reaches full charge or when the power receiving device requires power, the controller stops charging to prevent over-charge. This feedback loop ensures stable charge-discharge operation while maintaining adaptability to gap variations and load changes.
Solution Approach 2:
The patent employs dynamic control of the charging process by continuously adjusting the charging parameters based on real-time system conditions. The controller modifies the charging current dynamically in response to changes in coil gap, load variations, and battery state, preventing rapid current changes that lead to over-discharge and over-charge while maintaining flexible power transmission.
2Loss of energy
If feedback control is implemented to stabilize power transmission, then power transmission efficiency is improved, but system complexity increases
Solution Approach 1:
The patent integrates multiple functions into the single controller unit. The controller simultaneously performs feedback control for power transmission efficiency, battery charge-discharge management, over-charge prevention, and coordination between power feeding and power receiving devices. This multi-functional approach improves power transmission efficiency while minimizing the increase in system complexity by consolidating control functions.
3Speed
If rapid current changes occur due to gap variation or load changes, then system responsiveness is improved, but over-discharge and over-charge occur causing blackouts
Solution Approach 1:
The patent applies preliminary anti-action by implementing predictive control measures. The controller monitors system conditions and anticipates potential over-discharge or over-charge situations before they occur. When the battery reaches full charge or when power transmission conditions change, the controller proactively adjusts or stops charging current, preventing harmful over-charge and over-discharge conditions while maintaining appropriate system responsiveness.
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 effectively suppresses over-discharge and over-charge, maintaining stable power transmission and preventing blackouts by controlling the voltage and current in the contactless power-feeding system.
Implementation Method 1
the resonance phenomenon of the magnetic field is generated between the coils. In the contactless power-feeding system, a power-feeding device supplies power to a power-receiving device by using the resonance phenomenon
Implementation Method 2
a rectifier circuit... The rectifier circuit supplies the received power to the load to operate the load, and supplies the received power to the battery to charge the battery
Data Source
AI summary
According to an embodiment, a charge-discharge control apparatus includes a rectifier-voltage decrease detector circuit and an over-discharge suppression controller circuit. On the condition that the rectifier-voltage decrease detector circuit detects that voltage output from a rectifier circuit of a power-receiving device is decreased below a voltage threshold, the over-discharge suppression controller circuit suppresses over-discharge of an inverter circuit of a power-feeding device, or suppresses over-discharge of a battery of the power-receiving device.