Bidirectional Wireless Charging Supercapacitor Surge Protection
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Solution Overview
Problem
Wireless charging causes accumulated damage to electrical cells in portable devices, leading to reduced lifespan and inefficient charging/discharging, with existing technologies unable to effectively prevent damage and improve efficiency.
Innovation Solution
A bidirectional wireless charging/discharging device with supercapacitors to absorb surges, reverse current suppressors to prevent power loss, and a boost/buck unit with synchronous rectification, allowing for easy mode switching and protection circuits to manage temperature and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless charging is performed frequently, then charging convenience is improved, but accumulated damage to the electrical cell increases and lifespan decreases
Solution Approach 1:
A supercapacitor is introduced as an intermediary energy storage component between the wireless charging system and the electrical cell. The supercapacitor has lower impedance than the electrical cell, causing it to be charged first during wireless charging operations. This intermediary absorbs the charging surges and prevents direct stress on the electrical cell, thereby maintaining cell lifespan while enabling frequent convenient charging
Solution Approach 2:
The supercapacitor is positioned in the charging circuit to provide beforehand cushioning against charging surges. By being charged first due to its lower impedance, it cushions the electrical cell from the harmful effects of repeated charging surges, preventing accumulated damage before it occurs to the cell
2Productivity
If wireless charging efficiency is low, then charging speed is reduced, but energy loss increases and utilization decreases
Solution Approach 1:
The supercapacitor serves as an intermediary that can be charged rapidly from the wireless charging system and then discharge to the electrical cell, enabling faster effective charging speed to the cell while the system manages energy transfer to minimize losses
Solution Approach 2:
The system changes the electrical parameters by using a supercapacitor with significantly lower impedance than the electrical cell. This parameter change allows the supercapacitor to be charged first, enabling rapid energy transfer and improving overall charging efficiency and utilization
3Loss of energy
If reverse current is not suppressed, then power loss increases, but charging efficiency decreases
Solution Approach 1:
Reverse current suppressors are implemented to convert the potentially harmful reverse current flow into a controlled situation where power loss is minimized. By suppressing reverse current, the system prevents energy waste while maintaining efficient charging operations
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 device extends the lifespan of electrical cells by reducing damage from charging surges, improves charging/discharging efficiency, and enhances power utilization through efficient mode selection and protection mechanisms.
Implementation Method 1
the characteristics that the impedance of the supercapacitors is lower than that of an electrical cell makes the supercapacitors be first charged when performing a charging operation so as to use the supercapacitors to resist surges occurring in each charging operation
Implementation Method 2
first and second reverse current suppressors are included provide a function to prevent a reverse current and thus provide an effect of power saving
Implementation Method 3
a boost/buck unit used is a boost/buck unit that comprises synchronous rectification (preferably MOSFET based synchronous rectification) so as to improve boost/buck efficiency
Implementation Method 4
The wireless receiving/transmitting unit comprises a transmission terminal and a receipt terminal
Data Source
AI summary
A bidirectional wireless charging/discharging device for the portable electronic device includes a logic control unit, a boost/buck unit, first and second reverse current suppressors, a control switch, and a receipt/transmission mode selection unit. The logic control unit includes an automatic mode selection resetting module. The reverse current suppressor provide function of reverse current prevention and switching. The boost/buck unit controls stepping up/down of voltage in a charging operation. The logic control unit detects if a load exists and controls the operations of the boost/buck unit and the reverse current suppressor and is used in combination with the control switch to control the performance of charging or discharging and is further used in combination with the receipt or transmission mode selection unit to select a desired mode of operation. The receipt/transmission mode selection unit is electrically connected to automatic mode selection resetting module.