Oct 19, 2020
Mobility is a central part of the work environment today. We’ve become dependent on several devices to keep us connected to our daily routine. Increased data bundles and access to omnipresent Wi-Fi have broadly resolved the connectivity issues. However, usage still depends on keeping these power-hungry devices charged up. Wireless charging has the potential to transform our reliance on plug sockets, thus enabling the devices to be constantly topped up with power in almost any location. It’s also making in-roads in the healthcare, automotive, and manufacturing industries, especially with IoT devices, to get power many feet away from the charger.
Challenges of Wireless Charging
The primary limitation of wireless technology today is that every charger needs its own unique power supply. Consumers are facing the dilemma of carrying a specific wireless charging device or simply carrying a wired charger. The most popular and common wireless technology used now relies on the electromagnetic field between two copper coils. Major technologies used in wireless charging pads are tightly coupled electromagnetic inductive charging and electromagnetic resonant charging to transmit the charge to few centimeters. Another one has uncoupled radio frequency (RF) wireless charging that can provide charging capability at a distance of a few feet.
How does wireless charging work?
A magnetic loop antenna is used to create an oscillating magnetic field, which creates a current in one or more receiver antennas. Appropriate capacitance is added to make the loops resonate at the same frequency, which increases the amount of induced current in the receivers. This is called resonant inductive charging or magnetic resonance. It enables power transmission to slightly higher distances between transmitter and receiver and increases efficiency. Coil size also affects the distance of power transfer. The bigger the coil, or the more coils there are, the greater the distance a charge can travel. The major components that are necessary for wireless charging devices are an LED light indicator, non-slip pad surface, transmitter coil, fanless design for quiet operation, wireless charging chipset to control the flow of electricity, thermal protection sensor, and most importantly, a foreign object detection circuit to prevent conductive materials from receiving power from the charger.
Promising Wireless Charging Future
The electromagnetic resonant technology allows power transfer at certain distances away from a charging pad. This could allow the electric cars to charge just by parking on top of a large charging pad. Offices could transform as employee’s laptops, and devices wouldn’t be tied to proximity to a plug or power source. Wireless charging market size exceeded $11B in 2019 and is set to grow at 14.5% CAGR between 2020 and 2026. The rise in global sales of wearable devices, high-end smartphones, Industry 4.0 trends, and the automation of production, packaging, and assembly systems in industrial settings drive the deployment of wireless charging.
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