Wireless Charging Control Device Overvoltage Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless power transmission systems face inefficiencies and safety concerns due to the need for complex power generating units, which can lead to overvoltage damage in receiving terminals during continuous charging.
Innovation Solution
A charging control device with a simple configuration using only a switch and a capacitor, where the switch is controlled by the capacitor's voltage to block overvoltage and convert it into a suitable charging voltage, ensuring safe and efficient charging by preventing overvoltage from reaching the load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a complex power generating unit is used for charging control, then charging safety can be ensured, but device complexity increases and charging efficiency decreases
Solution Approach 1:
The patent extracts the essential charging control function from the complex power generating unit, isolating only the necessary components (switch and capacitor) while removing unnecessary complexity. The switch is controlled to open/close based on capacitor voltage thresholds, providing safety without requiring a complex power generating structure.
Solution Approach 2:
The capacitor serves dual functions: it smooths voltage fluctuations and provides the control signal for the switch through voltage threshold detection. The system uses its own operational parameters (capacitor voltage) to control itself, eliminating the need for external complex control circuits.
2Duration of action of stationary object
If wireless power is indefinitely supplied to the receiving terminal, then charging continuity is maintained, but the receiving terminal may be damaged due to over voltage
Solution Approach 1:
The patent implements a feedback mechanism where the capacitor voltage is continuously monitored and used to control the switch state. When voltage exceeds safe thresholds, the switch opens to block power flow; when voltage drops to safe levels, the switch closes to resume charging. This automatic feedback loop ensures continuous safe charging without overvoltage damage.
Solution Approach 2:
The charging process operates in periodic cycles of charging and blocking. The switch alternates between closed (charging) and open (blocking) states based on capacitor voltage thresholds, creating a periodic action that prevents continuous overvoltage while maintaining overall charging continuity.
3Reliability
If over voltage is blocked to protect the load, then charging safety is improved, but charging efficiency may decrease due to interruption
Solution Approach 1:
The switch operates in periodic cycles, alternating between closed (power flow) and open (blocking) states. This periodic action allows power transmission during safe voltage conditions while blocking only during overvoltage conditions, maintaining high overall charging efficiency while ensuring safety.
Solution Approach 2:
The capacitor maintains voltage smoothing during the switching transitions, ensuring continuous useful action. The energy stored in the capacitor bridges the brief blocking periods, maintaining continuous charging flow to the load even when the switch is momentarily open, thus preserving charging efficiency.
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 blocks overvoltage, ensuring charging safety and improving efficiency by continuously supplying optimal charging voltage, thereby shortening charging time and reducing costs.
Implementation Method 1
a capacitor (34) having one end connected to one end of the switch (32) and the other end connected to the other end of the switch (32) and one end of the output line (33)
Data Source
Figure 1~3
Figure 4
Figure 5
AI summary
A charging control device comprises a capacitor, a comparison unit and a switching unit. The capacitor is charged with a voltage converted from power received from a wireless power sending device. The comparison unit compares the voltage of the capacitor with a reference voltage, and generates an output signal according to the result of the comparison. The switching unit is connected to the front end of the capacitor and is switched by means of the output signal from the comparison unit so as to control whether to supply the converted voltage to a load terminal.