The LM96511 is an 8-channel integrated analog front end (AFE) module for multi-channel applications, particularly medical ultrasound. Each of the 8 signal paths consists of a low noise amplifier (LNA), a digitally programmable variable gain amplifier (DVGA) and a 12-bit, 40 Mega Samples Per Second (MSPS) analog-to-digital converter (ADC) with Instant Overload Recovery (IOR).
What are the key needs of an Energy Harvesting (EH) power supply? Well, first of all, battery redundancy power needs to be available at times when the ambient power is not available. Of course, we want to extend battery life by harvesting ambient energy from thermal, vibration, solar, etc. To make the front end of our power supply more versatile, it would be useful to be able to convert both AC (piezo, magnetic, etc.) or DC (solar) energy transducers with a fairly wide voltage range and also to have an input prioritizer that could decide whether to use the energy harvesting input or the battery input.
A synchronous buck-boost would make a versatile power converter, and low quiescent current is a plus. Keeping the output regulated would be important when transitioning between ambient and battery power and vice-versa. A good, solid current output capability with possibility of different selectable output voltages would top off the wish list.
The LTC3330 does all of the above.
Linear Technology announced the LTC3330, a complete regulating energy harvesting solution that delivers up to 50mA of continuous output current to extend battery life when harvestable energy is available. The IC requires no supply current from the battery (Iq=0) when providing regulated power to the load from harvested energy and only 750 nA operating when powered from the battery under no-load conditions.
The regulator integrates a high voltage energy harvesting power supply, plus a synchronous buck-boost DC/DC converter powered by a primary cell battery to create a single non-interruptible output for energy harvesting applications such as those in wireless sensor networks.
A comprehensive block diagram shows the high level of integration in this power supply
The energy harvesting power supply, consisting of a full-wave bridge rectifier accommodating AC or DC inputs and a high efficiency buck converter, harvests energy from piezoelectric (AC), solar (DC) or magnetic (AC) sources. The primary cell input powers a buck-boost converter that operates from 1.8V to 5.5V at its input when harvested energy is not available to regulate the output whether the input is above, below or equal to the output. The IC automatically transitions to the battery when the harvesting source is no longer available.
A typical application diagram
The device’s energy harvesting inputs operate from a voltage range of 3V to 19V, AC or DC, making it ideal for a wide array of piezoelectric, solar or magnetic energy sources. Its input under-voltage lockout threshold settings are programmable between 3V and 18V, enabling the application to operate the energy harvesting source at its peak power transfer point. Other features include programmable DC/DC nd LDO output voltage post-regulator for powering a microcontroller, buck-boost peak current limits, super-capacitor charger/balancer and an input protective shunt (up to 25mA at VIN >20V).
I've had it with LED lamps. The world has been told that LEDs are the future, in part because they are economically the right form of long-term lighting, and there are environmental benefits as a great aside. Well, maybe the environmental argument is true, but the economical one is not.
My wife has converted a substantial amount of our home lighting, as well as our holiday decoration lighting, to LED bulbs. Despite all this investment, I have yet to experience the primary benefit of long life. This made me sit down recently and ask myself why.
Microsoft's hologram headset is real, is absolutely coming to market, according to the company, and, for the most part, does what it says it does: creates interactive holograms in a user's view of the real world.
Early builds of the HoloLens device allowed me to walk on the surface of Mars and talk to a NASA scientist about the formation of the rocks there. A Microsoft employee used Skype and the headset to show me, with diagrams layered over my view of the wall in front of me, how to wire a light switch. I watched someone build a 3D model of a toy in real time and, finally, had a chance to play a take on Minecraft that involved digging holes through coffee tables and blowing away a section of a wall to reveal the lava-scape behind it.
Researchers at the Korea Advanced Institute of Science and Technology (KAIST) have explored how the attractive physical features of zinc oxide (ZnO) materials could be more effectively used to tap into abundant mechanical energy sources to power micro devices.
The KAIST team discovered that inserting aluminum nitride insulating layers into ZnO-based energy harvesting devices led to an improvement of the devices performance which will help to make wearable electronics that are flexible, sustainable and powered by ambient renewable energy.
Coils are not a very common component in electronic circuits, however when they are used, they need to be understood. They are encountered in oscillators, radio-receivers, transmitter and similar devices containing oscillatory circuits. In amateur devices, coils can be made by winding one or more layers of insulated copper wire onto a former such as PVC, cardboard, etc. Factory-made coils come in different shapes and sizes, but the common feature for all is an insulated body with turns of copper wire.