Wireless Charging Current Amplifier for Thick Battery Covers
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Solution Overview
Problem
Wireless charging is challenging for electronic devices with battery covers thicker than the standard wireless charging range, such as mobile phones designed for mountainous or military use, as the charging efficiency is hindered by the increased thickness.
Innovation Solution
A wireless charging apparatus comprising a transmitter with a transmission coil, a first receiver mounted on the outer surface of the device's cover to amplify the current, and a second receiver inside the cover to wirelessly charge the battery, utilizing an amplifier with a second coil having twice the number of turns of the first coil to enhance charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the battery cover thickness is increased for rugged devices, then device durability and protection are improved, but wireless charging range and efficiency deteriorate
Solution Approach 1:
The patent introduces a current amplifier as an intermediary component between the primary coil (in charger) and secondary coil (in device). This amplifier receives weak current from the primary coil, amplifies it, and transmits the amplified current to the secondary coil, enabling wireless charging through thick battery covers that would otherwise block the magnetic field
Solution Approach 2:
The wireless charging system is segmented into three functional parts: (1) primary coil for receiving power from charger, (2) current amplifier for signal enhancement, and (3) secondary coil for battery charging. This segmentation allows the amplifier to compensate for the attenuated magnetic field caused by thick battery covers
2Strength
If the battery cover thickness is increased, then device protection is improved, but wireless charging efficiency deteriorates
Solution Approach 1:
The current amplifier acts as a mediator that compensates for energy loss caused by the thick battery cover. By amplifying the current, it ensures sufficient power reaches the secondary coil despite the attenuating effect of the thick cover, maintaining charging efficiency
Solution Approach 2:
The patent changes the current parameter by introducing an amplifier that increases current magnitude. This parameter change compensates for the energy loss introduced by the thick battery cover, maintaining effective power transfer
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 apparatus effectively increases the wireless charging range, allowing reliable battery charging even when the device is farther from the charger, by amplifying the current and maintaining sufficient power levels to charge the battery at a predetermined rate.
Implementation Method 1
The input circuit may include an input coil to the first current based on electromagnetic induction with the transmission coil
Implementation Method 2
The amplifier may include a first coil electrically connected to the input circuit; and a second coil facing the first coil
Data Source
AI summary
A wireless charging apparatus includes a transmitter, and first receiver, and a second receiver. The transmitter wirelessly transmits first power from a charger. The first receiver amplifies first current corresponding to the first power to second current. The second receiver wirelessly receives second power corresponding to the second current. The second power charges a battery of an electronic device, and the first and second receivers are coupled to the electronic device.