Keep up with the latest news in 2018: fast charging and wireless charging, Bluetooth and smart home and GaN
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This post was last edited by alan000345 on 2018-12-20 08:43 Fast charging and wireless charging, Bluetooth, smart home and GaN are hot topics this year. Let's take a closer look at these topics to learn more. Fast charging and wireless charging Fast charging and wireless charging are completely different charging methods. The working principle of fast charging is to force a lot of electrons under high voltage. The lower the power, the higher the fast charging voltage. Therefore, many fast charging methods now work below 50-70%. At this time, the battery will still efficiently accept ions instead of converting electrical energy into heat and wasting it. In fact, the principle of wireless charging is very simple. It mainly uses what we learned in middle school. The principle of electromagnetic induction mainly requires two coils. One is placed in the wireless charger under the mobile phone, with a power socket to supply power, and the other is placed in the mobile phone. When the current passes through the coil of the wireless charger, a magnetic field will be generated. As long as the power provided is AC, a magnetic field that constantly changes direction can be generated. At this time, the coil in the mobile phone will feel the change of the surrounding magnetic field. Then use a rectifier to convert the induced AC into DC for charging. As long as this DC is transmitted to the mobile phone battery, wireless charging can be completed. At present, many companies have both fast charging and wireless charging functions. As shown in Figure 1, this charger. Figure 1 Bluetooth and Smart Home Bluetooth is a point-to-point, short-distance communication method, mainly used for mobile devices or short-distance transmission. It is widely used in mobile devices, such as mobile phones, headphones, notebooks, tablets, etc. All support Bluetooth functions. In addition, Bluetooth devices are small and easy to carry, so in the field of smart homes, Bluetooth technology is more suitable for some close-range private use devices, such as smart bracelets, smart watches, smart scales, etc. Bluetooth is widely used in the security of smart homes to reduce the false alarm rate. Smart home appliances include large and small home appliances such as refrigerators, washing machines, microwave ovens, and televisions. They are connected to the main station through Bluetooth wireless communication technology and obtain information on the use of home appliances through the Internet. What is GaN? The research boom of gallium nitride (GaN) has swept the global electronics industry. Let's take a closer look at gallium nitride (GaN) products. This material belongs to wide bandgap semiconductor materials. It has excellent properties such as large bandgap width, high thermal conductivity, high electron saturation drift velocity, and easy formation of heterostructures. It is very suitable for the development of high-frequency, high-power microwave and millimeter wave devices and circuits. It has been the most ideal semiconductor material for the development of microwave power devices in the past 20 years. With the continuous improvement of epitaxial material crystal quality and the continuous improvement of device technology, microwave and millimeter wave devices and circuits developed based on GaN-based materials have higher and higher operating frequencies and higher and higher output powers. In the current power supply market, smaller size and higher power power supply products have become a trend that businesses are competing for. Gallium nitride (GaN) is becoming more and more important. The GaN FET device series integrates unique functions and protection features to simplify the design, achieve higher system reliability and optimize the performance of high-voltage power supplies, providing a smart alternative solution for traditional cascade and independent GaN FETs. I remember that Texas Instruments recently promoted three products: LMG3410R050, LMG3410R070 and LMG3411R070. It is said that their competitive advantages are: 1. Smaller and more efficient solutions. Compared with silicon metal oxide semiconductor field effect transistors (MOSFETs), Texas Instruments' integrated GaN power stage can double the power density and reduce losses by 80%. Each device has a fast 1MHz switching frequency and a slew rate of up to 100V/ns. 2. System reliability. This series of product portfolios has undergone more than 2000 hours of equipment reliability testing including acceleration and in-application hard switching. In addition, each device provides integrated heat dissipation and high-speed, 100ns overcurrent protection to prevent shoot-through and short-circuit conditions. 3. Equipment supporting services for each power level. Under 50mΩ or 70mΩ conditions, each device in this product portfolio provides a GaN FET, driver and protection functions to provide a single-chip solution for applications below 100W to 10kW. ![]()
Although it is a new technology, GaN has a wide range of applications. From low power to high power, GaN has been used in PE, mobile phone chargers, and laptop chargers. In addition, for high-power applications such as power infrastructure and new energy similar to charging piles, GaN is a suitable choice from a volume perspective. Okay, that’s all I have to say. I hope it will be of better help to everyone in their new product development.
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