Nowadays along with the rapid development of wireless communication technology, everything goes wireless, and charging has no exception. Without using any cable or AC adaptor, wireless charging transfers power from a transmitter to a receiver by changing the electromagnetic fields between the transmitter and receiver.
Due to the convenience of this technique, smartphones, wearable devices, advanced medical therapies in healthcare, industrial related applications, and electric vehicles, etc., are all gradually deployed with wireless charging. Among them, consumer electronics application is definitely the majority, which occupies more than 60% of the market share.
Besides, growing demand of smartphones in South East Asia plus increasing need of electric vehicles in Europe and North America have become major driving forces for the wireless charging market. Overall, Europe, North America and Asia Pacific (especially China, Japan, India) are the main regions with rapid growth in this market.
Since the demand is so strong, the wireless charging market will keep growing in the future. According to Global Market Insights, this market is estimated to reach USD 30 billion by 2026, with a CAGR of 14.5% from 2020. And in 2019, the market size had already exceeded USD 11 billion.
The characteristics of inductive and resonant wireless charging
Basically, the main technologies of wireless charging are inductive charging and resonant charging. Inductive charging is the dominant technology which is supported by WPC (Wireless Power Consortium) with Qi standard. It has more than 45% penetration in the market and usually requires charging level below 100W. On the other hand, resonant charging is supported by AirFuel Alliance which focuses on magnetic resonance and RF wireless power solutions.
|Inductive single-coil||Inductive multi-coil||Magnetic resonance|
|Standard||Qi inductive 110～205 KHz||Resonant AirFuel
|Positioning of receiver application||Exact positioning||Positioning more flexible|
(X and Y direction)
(up to >30mm vertical freedom)
|Number of devices charged||Only one||One device |
but with better user experience
|Rx-Tx communication||In-band communication||BLE or in-band communication|
In comparison, inductive charging operates between 110～205KHz and resonant charging operates at 6.78MHz. Inductive charging has the advantages of charging efficiency and cost efficiency since the device coil and charger coil are close to each other; resonant charging provides a better user experience since it could charge multiple devices and the charged devices could be placed freely.
Wireless charging materials: chips, magnetic materials and coils
From the manufacturing point of view, the transmitter side of wireless charging is comprised of chips, coils and solution design; the receiver side of wireless charging is comprised of chips, magnetic materials, coils, solution design and module manufacturing. In average, chip accounts for around 28% of total cost, magnetic material accounts for around 21%, and coil accounts for around 14%.
Chips mainly consist of controllers (wireless charging controlling MCU or SoC), power MOSFETs and other components. Among them, power MOSFETs will be further discussed below. Magnetic materials consist of ferrite, amorphous, and nanocrystalline. They are used to eliminate the effect of magnetic field towards batteries and other components. Coils are the bridges between transmitters and receivers, and there are several options for current main coils: copper coils, FPC coils and flat coils.
Generally speaking, the major players in wireless charging market include WiTricity, Texas Instruments, Qualcomm, Powermat, Powercast, Murata, MediaTek, and Integrated Device Technology, etc.
Suitable power MOSFET solutions provided by PANJIT
Making wireless charging transmitter to be adopted by consumer electronics applications, a high-efficiency, low power consumption, low operating temperature and low-profile package MOSFET solution is required. PANJIT, a great partner of TechDesign, has developed related products which suit the above requirement. The MOSFET solutions provided by PANJIT are with low FOM, low gate drive, exposed thermal pad, and SMD package.
All the recommended MOSFET solutions for wireless charging transmitter in consumer electronics applications from PANJIT are listed in Table 2. For more information, the MOSFETs used in wireless charging pads, sockets, cases and stations are with around 30V VDS, 20V VGS, and 5～30W power (depending on various RDS(on)). Besides, for DFN package, the exposed thermal pads could reduce thermal at MOSFET; on the other hand, for SOP package, customers could enjoy the cost advantage.
|Power||Recommended Panjit MOSFET Part Number|
Wireless charging is a fast-evolving technology with large potential to grow in the market and the market revenue is estimated to reach USD 30 billion by 2026, from Global Market Insights. Inductive and resonant wireless charging are the typical technologies for wireless charging; each of them has its own advantages. Inductive charging is efficient on charging and cost; resonant charging could charge multiple devices and the charged devices could be placed freely.
The cost of wireless charging manufacturing contains chips, magnetic materials, coils, solution design and module manufacturing, and MOSFET is one of the key components in chip segment. The MOSFETs provided by PANJIT could be used either on inductive charging or on resonant charging as long as the specifications are suitable.
PANJIT develops and manufactures competitive MOSFET products for wireless charging transmitter in consumer electronics applications. They could be used in wireless charging pads, sockets, cases and stations with around 30V VDS, 20V VGS, and 5～30W power. With abundant experiences on MOSFETs, PANJIT provides low FOM, low profile package, low gate drive and exposed thermal pad MOSFETs to the market.
Now, come to TechDesign immediately to start your wireless charging transmitter design by selecting the recommended MOSFETs!
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