Murata's new product: the best energy device for wireless sensor network nodes

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In recent years, with the rapid development of the Internet of Things technology, the industry has been expecting wireless communication technology using energy harvesting as a power source to be applied to all aspects of life. In order to collect various information, a large number of sensor nodes are applied to the Internet of Things, and energy harvesting is expected to be applied as an energy device to wireless network sensor nodes, because energy collection can eliminate the need to periodically replace the sensor battery, and is not limited to the battery. Endurance. Since the energy collected is not very stable and reliable, it is necessary to add an energy storage device.

At present, there are different types of energy storage devices such as supercapacitors and traditional lithium-ion batteries on the market. In contrast, Murata 's small energy devices (UMA series) have superior product characteristics that are more suitable for energy harvesting applications. It contributes to the high efficiency, maintenance-free, space-saving and lightweight of the sensor nodes, charging at low currents in a variety of complex environments, and keeping energy from leaking. For example, in large-scale structural health monitoring (SHM) such as bridges, tunnels, dams or rigs, it is necessary to combat strong external disturbances such as weather, earthquakes, traffic flow, etc., and it is often inconvenient to replace batteries frequently. Murata UMA series products.

block diagram

Murata 's small energy device (UMA series) can efficiently extract and collect energy sources such as light energy, kinetic energy, and thermal energy, and convert it into electrical energy to continuously supply power to the system. The first major feature of this energy storage device is that it has a long life. Even if the charge and discharge cycle is more than 5000 times (discharge depth: 50%), the capacity degradation is small. It is calculated by charging and discharging UMA once a day, and 5000 cycles are about It can have a service life of 13 years; the second is characterized by ultra-low loss. Even with a small current of 5uA, UMA still has superior charging (capacity) retention rate, and because of its low leakage current, capacity retention after 90 days of charging The rate can also reach 88%*2, and the leakage current is equivalent to 0.17μA*2. The third feature is rapid start-up. Compared to supercapacitors and traditional lithium-ion batteries, UMA can quickly charge to the nominal after the energy harvesting function is turned on. Voltage to help reduce charging time or avoid using a primary battery for pre-charging. The fourth major feature is the direct drive load, which can be used for peak power assistance such as Beacon that requires instantaneous large current discharge. In addition, UMA can also discharge at a high rate, directly supporting the transmission of near-field communication devices (such as BLE, Zigbee, etc.), and because of its low ESR, it can be used normally even in a temperature environment of -20 °C. Because of these advantages, Murata's small energy devices (UMA series) are tracking and locating devices (smart home, smart building, smart agriculture, asset tracking, inventory tracking, baggage tracking, animal/pet tracking, child/elderly tracking, patient monitoring, Farm animals use RFID tags, etc., and are widely used in many fields.

<Comparison of VT characteristics of UMA and supercapacitor*2> *2 Example data of UMAC040130A003TA01

Continuously rich product lineup

This time, in order to meet the market demand for thin and large-capacity energy device products, Murata has added a laminated UMAL to the UMAC lineup of the original "UMA Series" cylindrical energy device. The laminated UMAL achieves a capacity of 12 mAh, a low impedance of 200 mΩ, and a longer cycle characteristic than UMAC. In the future, Murata will further increase its product range to meet the market demand for larger capacity.