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LOW POWER CMOS PIEZOELECTRIC ENERGY HARVESTING CIRCUIT FOR VEHICLE TYRE PRESSURE SENSOR
Most low-power electronics, such as remote sensors and implantable devices are powered by batteries. However, even long-lasting batteries have a limited lifespan and must be replaced every few years. The replacements become costly when there are hundreds of sensors in remote locations. Energy harvesting technologies, on the other hand, provide unlimited operating life of low-power equipment and eliminate the need to replace batteries where it is costly, impractical, or dangerous. Most energy harvesting applications are designed to be self-sustaining, cost-effective, and to require little or no servicing for many years. In addition, the power is used closest to the source, hence eliminating transmission losses and long cables. If the energy is enough to power the device directly, the application or device powered by the energy can operate battery less. Tyre pressure monitoring systems (TPMS) are becoming increasingly important to ensure safe and efficient use of tyres in the automotive sector and powered by batteries. These pressure sensors mounted an inside of the rim and the batteries are not exchangeable. When a battery reaches the end of its life span the whole sensor has to be replaced. In order to provide a maintenance free and battery less sensor solution there is growing interest in using energy harvesting technologies to provide power to TPMS.
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