Researchers at the Korea Advanced Institute of Science and Technology (KAIST) have developed a wearable, flexible band-shaped thermoelectric (TE) generator that can harvest body heat to power a mobile device and achieve an output power density several tens of times higher than that of previous flexible TE generators. The 10x10 cm power band uses inorganic-based TE materials sandwiched between thin glass fabric substrates, and can be bent as many as 120 times.
According to the researchers, the device can produce about 40 mW based on the temperature difference between human skin and the surrounding air (see photo below). For more, see "A wearable thermoelectric generator fabricated on a glass fabric."
A flexible thermoelectric generator that can be worn as a wristband is able to produce about 40 mW based on the temperature difference between human skin and the surrounding air.
Panasonic Corp. has announced that it has achieved a record solar cell conversion efficiency using a silicon-based solar cell of practical size. Made possible by an improvement in the company's heterojunction technology, a conversion efficiency of 25.6% was achieved at a research level in an HIT solar cell with a cell area of 143.7 cm2. For more see "Panasonic HIT(R) Solar Cell Achieves World's Highest Energy Conversion Efficiency of 25.6% at Research Level."
In product news, Linear Technology has announced a dual PWM DC/DC converter that features two internal 2 A, 50 V switches and an additional 500 mA switch to facilitate step-down, step-up, and inverting conversions. The LT8471 operates from an input voltage of 2.6 to 50 V and can deliver up to 1.5 A at 5 V and 650 mA at –5 V.
Intersil has introduced an 80 V, 4 A DC/DC step-down power module. The ISL8216M accommodates an input voltage of 10 to 80 V with an adjustable 2.5 to 30 V output and is packaged in a thermally enhanced 15x15x3.6 mm over-molded high-density array package.
A precision analog front end and controller from Analog Devices is designed for testing and monitoring battery cells. The AD8451 offers precise voltage and current measurement, integrated constant current and voltage modes with automatic switchover, charge/discharge modes, and integrated precision control feedback blocks.
Maxim Integrated has announced a high-efficiency, high-voltage, synchronously rectified step-down converter with dual integrated MOSFETs. Offered as the industry's only 60 V, 1.7 A internal FET synchronous buck converter, the MAX17505 is available in a 4x4 mm TQFN lead-free package with an exposed pad.
A dual synchronous regulator from Allegro MicroSystems is designed specifically for automotive infotainment, GPS, telecom, networking, and home audio applications. The AEC Q100-qualified A8651 converts input voltages from 2.5 to 5.5 V down to as low as 0.8 V and is able to supply up to 2 A of load current per regulator.
SL Power Electronics has introduced a high-density conduction-cooled LED power supply that meets global lighting requirements. The LB130 delivers 130 W at 70°C ambient with no derating and offers 90% efficiency from a 3x5x1.3 inch package.
Ericsson has introduced a 50 W sixteenth-brick DC/DC converter module that targets PoE applications. The PKU5510E has an input range of 18 to 75 V, a built-in functional isolation of 2,250 Vdc, and an output capability of 15 A at 3.3 V.
Freescale Semiconductor has announced availability of an AEC-Q100-qualified intelligent battery sensor that measures key battery parameters for monitoring state of health, state of charge, and state of function. The MM9Z1J638 combines three measurement channels, a 16/32 bit MCU, and a CAN protocol module in a single 7x7 mm 48-pin QFN package.
Murata Power Solutions has announced isolated 6 W single- and dual-output DC/DC converters with a 4:1 input range that meet 3rd-edition medical safety standard UL60601. The NCM6 series is available in three nominal input voltage ranges (5, 12, and 48 Vdc), each of which offers seven output voltage models.
Vicor Corp. has introduced additions to its isolated ChiP bus converter modules. The new ChiP BCM fixed-ratio power converters feature a power density of 2750 W/in3 and supply up to 1.75 kW at 50 V with 98% peak efficiency.
Finally, Rohm is offering high-power ultra-low-ohmic shunt resistors intended for current detection in applications with increased power requirements. The new PSR series includes the PSR400, rated at 4 W, and the PSR500, rated at up to 5 W.