Automotive key fobs are used to activate a vehicle's which operate on remote keyless system. Key fobs are a very popular in vehicle accessory as they are a secure and convenient and secure unlocking and locking of a vehicle. Key fobs are designed to remotely start the vehicle or open an auto's trunk. An energy harvesting system for use in vehicle included an RF transmitter position and a key fob having an antenna configured to receive an RF signal from the transmitter and convert the RF signal to electrical energy. A power management circuit configured to distribute the electrical energy in the key fob, and an energy storage device configured at least some of the electrical energy converted from the RF signal.
Energy harvesting in automotive key fob application is bifurcated by storage devices, by operating frequency and by region. By storage devices, it can be further segmented into capacitor, battery and super capacitor. Energy stored in capacitor are in electric field but in battery it is in chemical form. Battery uses chemical storage as greater capability for storing energy than capacitor which can be very useful for energy harvesting. Discharging Capability of battery compared to capacitor is very slowed in battery chemical is used, as chemical reaction required time to transfer chemical energy into electrical energy. Capacitor has long life, less charging time, excellent temperature performance however, batteries have large storage capability that is significant for energy harvesting in automotive key fob. The life cycle of battery cells is usually in range to one thousand to several thousand discharge and charge cycles depending on the type of battery and capacitor. By contrast, a super capacitor has an almost unlimited capability since no chemical and phase changes are involved in its charging and discharging.
By operating frequency, the market is divided into high frequency and low frequency. High frequency is in between 13.56MHz to 433 MHz (100 meter away) range whereas low frequency is in between 125 KHz to 134 KHz. Functions such opening the door, closing it and starting the vehicle, the passive entry and passive start vehicle (including the Low Frequency antennas) may also function in conjunction with the power management circuit. Particularly, the Low Frequency antenna in the key fob receives the Low Frequency signal transmitted by the Low Frequency antennas and converts the Low Frequency signal to an electrical current. The power management circuit receives the current from the Low Frequency antenna and controls the distribution of electrical energy to and from the energy storage device. Frequency range from 433.92MHz and of 220MHz to 420MHz are used in countries outside of the Europe. Moreover, the advancements in design & technology has facilitated the rise in demand for key fob in various applications that is expected to positively support the growth of overall automotive key fob ecosystem during the forecast period from 2017 to 2025. By region Energy harvesting in automotive key fob application market is studied according to regional bifurcations such as North America, Europe, Asia Pacific, Middle East & Africa and South America. Additionally, the flexible circuit manufacturing market are having highest growth rate in Asia Pacific and North America region. Europe and North America are considered to be the key facilitator for this market, however, the APAC region along with MEA will provide better opportunities for the automotive key fob suppliers
The major players for energy harvesting in automotive key fob application market are JMA U.K, advanced RF Technologies (ADRF), SOLiD Technologies, Cobham Wireless, Bird/DeltaNode, Comba Telecom, Corning, Dali Wireless, Fiber-Span, CommScope, Kathrein, Westell, Zinwave and so on.
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