Monthly Archives: December 2015

Essay Penning Systems: Select the best One Will Match Your Requirements

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Man made Learning ability: Could it Ever before Get a Place of a persons Mind?

Man made Learning ability: Could it Ever before Get a Place of a persons Mind?

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Power Efficient Design for Wearable Electronics

The wearable electronic device market is growing rapidly with predictions of more than a $10bn market size by 2020. But the devices are small and so are the batteries so you need to be careful and creative to ensure your device has a battery life of months or years instead of days or hours. That means careful attention to everything from clock startup times to the switching times of MOSFETs. Here are some pointers for getting every minute of battery energy count. While some ideas may only save tiny amounts of energy, others are more significant. Lots of small savings can add up to make a significant saving.

 

Sleep

Maybe the most obvious strategy for power saving is for the device to be in a low power “sleep” state as much as possible, assuming it cannot actually be turned off completely. You obviously need a means of waking it which can be periodically by time or an event (i.e. interrupt) such as a button push or physical movement. You then have various parameters to juggle with such as how often the device wakes up and what it does when it wakes up. You can also have dynamic sleep intervals whereby the device sleeps for varying times depending what is happening. For example, with a fitness monitor you may want to monitor and log data quite frequently when there is activity but when the activity slows or stops, the monitor interval could be increased, thus saving battery power.

 

Inter-IC communications

I2C has pullup resistors which waste power – SPI doesn’t need pullup resistors. Pin capacitance consumes power between ICs. Minimize the amount of data you transfer if you can. If there are four lines of 5pF each running at 20MHz with a 3.3V supply, it will draw 660µA due to pin capacitance alone (current = 0.5CVf where C is the pin capacitance, V is the supply voltage and f is the frequency). The pin capacitance will be both the sending and receiving all the IC capacitance combined. This current may be dwarfed by the actual IC current, but not always – it depends on the function of the device. It is a contributory factor to why highly integrated chips can be the most efficient – access to peripherals, RAM and flash memory is all internal so no pin capacitance is involved when accessing those peripherals or memory. A large part of pin capacitance is due to the ESD protection diodes.

 

Power Supply Efficiencies

Choosing a switching regulator for a switched mode power supply is a key factor in maximizing efficiency, particularly synchronous regulators where efficiencies of over 95% are possible. However, it is not just headline efficiency or even standby efficiency that is necessarily the most critical. It is necessary to look at the current in different modes for the device and determine the contribution to overall power consumption from each mode after taking account of the switching regulator efficiency at each current level. There are some quite impressive regulators around though, such as the new Analog Devices ADP5301 Step-down Regulators. The quiescent current is down as low as 180nA when not-switching but still operating in hysteresis mode. It will switch for a short burst to add charge to the output capacitor using the inductor at very light loads then return to just the quiescent current. The low quiescent current can give you efficiencies as high as 80% at 1µA depending on the input and output voltages. You are more likely to see lower figures than that optimum value, but still above 40%. It also delivers up to 0.5A and has a single pin programmable output with a fixed resistor. It is very impressive compared to older regulators which would take a few milliamps with no load.

If you are using a switching regulator with an external MOSFET, bear in mind that the MOSFET switching time can result in significant losses. The transition from non-conducting to conducting is the time when a switching MOSFET dissipates the most power. When it is turned fully on the voltage drop will usually be very small and hence power dissipation will be low. However, partly turned on there will be a significant voltage drop across the MOSFET accompanied by significant current. You therefore want to minimize the time that transistor spends in that state by choosing a fast switching device and low gate capacitance. You obviously want a low ON resistance as well.

 

Power supply shutdown

See if you can keep power supply capacitors small if the power supplies are shut down in sleep mode. It takes energy to charge them and if the power supply is shut down when in a sleep mode then the energy in the capacitors is wasted energy (unless it will still be there when you need it next). For example, a 1µF capacitor on the power supply of circuitry which is shut down 100 times per second will consume 165µA at 3.3V (same calculation as before). Many ICs will take less than that in shutdown or sleep mode, so it is often better to keep circuitry powered but in a sleep state than to actually do power switching to save power. The exception would be if the device you were using didn’t have a sleep mode or if its sleep mode was not very low current. If you can use 100nF instead of 1µF you could save a lot of energy.

 

Low supply voltage

Devices will consume less power at lower voltage even if they don’t consume less current. So, if a microcontroller is powered by 1.8V instead of 3.3V power consumption will be half for the same current. Usually digital devices will also consume less current at lower voltage as well so the power is further reduced. Watch out for the maximum clock speed also reducing though – it is not uncommon for the maximum clock speed to be lower at lower voltages. So, while the current will be lower it will take twice as long to run the microcontroller’s code.

For example, while the Microchip nanoWatt XLP PIC24F16KA102 microcontroller running at 2MHz consumes 695µA at 3.3V, it only requires 363µA at 1.8V, which is 70% less power – a massive saving. However, at 3.3V the microcontroller can run at 32MHz, while at 1.8V the maximum clock speed is 8MHz.

 

Clock Speeds

Choose the clock speed to suit the application, not just the fastest possible. This probably won’t be knows until the code is finished. Most microcontrollers have an adjustable clock multiplier, allowing the clock speed to be changed by the application code. If the microcontroller code is the limiting factor in terms of executing the code and going back to sleep, then the fastest may be the most efficient. However, if something else will actually be slowing things down and the microcontroller will be “marking time”, the microcontroller can be woken by a periodic interrupt instead.

An alternative approach would be to dramatically slow down the processor when it is just “waiting” and then speed it back up when there is something to do. Ideally you would sleep instead but clock startup times and the power wasted while waiting for the clock to stabilize can mean sleep is not the best option in some circumstances.

 

Clock Startup

Power is wasted while waiting for the system clock to stabilize. If code can be run while the clock is still settling then that can help, but if there is any other part of the circuitry relying on a stable, accurate clock the processor has to wait, resulting in wasted energy. Some microcontroller manufacturers’ clocks are quicker to start than others.

 

32-bit Microcontrollers

Does very design really need a 32-bit processor? They seem to be everywhere but the work actually being done by them can be minimal. A 16-bit or 8-bit microcontroller may be more efficient. It does depend on what code running and the efficiency of the compiler. If there is a Bluetooth or Internet interface then more memory may be required and a 16-bit or 32-bit processor should be used. An TCP/IP stack with a web server requires a 32-bit processor. Creative software writing can minimize the resources needed and minimize power consumption.

Wider data width processors consume more power in a number of ways. Accessing 32-bit RAM and Flash memory is more power hungry than accessing 16-bit memory. Also, leakage current increases with wider memory. That points towards keeping memory size to a minimum both by efficient code structuring and writing, and also not choosing a processor with massive amounts of excess memory.

 

RF power

If there is a RF wireless interface, e.g. Bluetooth Smart, consider the transmitting distance. Not only are there power savings by transmitting with lower power, the receiver sections can have adjustable sensitivity and will take less power when sensitivity is set lower. For example, the Nordic Semiconductor nRF52832 has a high receiver sensitivity mode taking 10.9mA but normal sensitivity only takes 6.1mA

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Illustrate the procedure of Expansion of the company straight into a New District or Nation

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Electricity from Human Power

Over the years I’ve seen numerous claims about devices that generate electricity from human power. The other day I saw that CSIRO, Australia’s national science agency, produced a power generating “Infinity Swing.” And recently, one of my non-engineer friends (yes, engineers have non-engineer friends) sent me a link to an article entitled, “60 Minutes on this Bicycle Can Power Your Home for 24 Hours!” So I thought I’d take a few minutes to explain the physics – and of course, the math – of generating electricity from human power. I’m going to use best case scenarios and assume perfect conversion efficiency for two reasons. First, these are ballpark estimates; exact values vary from one person to the next. (I’ll tell you the second reason later.)

 

The Infinity Swing demonstrates one way to convert human power into electricity:  a person on a swing whose movement causes a generator to spin.  The swing wasn’t designed to produce a significant amount of electricity, but to show how a lot of human exertion translates into such a small amount of electrical power. How much electricity can it produce?

 

The primary force on a swing is the force of gravity pulling down on the weight, but gravity always pulls straight down, so the force on the chain equals the weight only when the swing is at its bottom; the rest of the time it’s somewhat less. The force on the chain depends on the angle of the swing, and since there are an infinite number of infinitesimally small locations for the swing, trigonometry and calculus are needed to calculate the energy exerted from one oscillation of the swing. Or, you could use an online pendulum calculator like I used:

 

http://www.calctool.org/CALC/phys/newtonian/pendulum

 

Energy = 667 Joules

Period (Time) = 3 seconds

Power = Energy / Time = 667 J / 3 s = 222.2 J/s = 222.2 Watts.

 

Assuming a generator with 100% conversion efficiency, a 68 kg (150 pound) person on that swing can generate about 222 Watts of power. That’s just enough to light up a few LEDs on the chain and power the lighted letter above the swing. The Infinity Swing has eight individual swings. Assuming each one is manned 24/7, the swing could generate about 300 kWh of electricity per week.

 

So if you have 24 friends who are all willing to swing for eight hours per day, you could save about $143/month on your electric bill! Of course, you’ll have to feed them, and they’ll burn a lot of calories. Which leads to the Free Electric Machine…

 

The Free Electric Machine: Image courtesy of Billions in Change

 

Improve your health! Eliminate your electric bill! (One of those statements is true.)

 

The Free Electric Machine promises to power your house for 24 hours after just an hour of pedaling. How much is that?

 

A typical person (68 kg, 150 pounds) pedaling at a moderate rate (19 km/hr, 12 mph) burns about 500 calories in an hour. One calorie is equivalent to 0.0012 kWh, so that hour on a bike will generate 0.6 kWh of electricity (again, assuming perfect conversion efficiency). If the only electrical appliance at your house is a 25 watt light bulb, then the claim is true. In reality, this device is intended for developing nations where they don’t use much electricity. One kWh can easily light a few LED bulbs for a night and charge a cell phone, which is pretty much what they need in those locations. However, a typical home in a developed nation uses forty times that much energy. That’s a lot of pedaling!

 

One thing that’s amusing: the guy who created the Free Electric Machine also owns the “5-Hour Energy” product line. When I first saw news of this device, I thought, “What a brilliant way to sell more of his energy drink!” (Maybe he’s shooting for perpetual motion: chug a 5-Hour Energy drink, pedal like crazy. Chug another one, pedal some more. Repeat.)

 

So why did I assume best case scenarios and perfect conversion efficiency? Well, as you can see from the calculations, even under the best of conditions the electricity produced from people power is feeble by first world standards. The human body is a remarkably efficient machine. It only uses about 2000 calories each day – roughly the equivalent of a 100 watt light bulb. Our appliances and machines require considerably more energy; no generator is going to produce that from human kinetics.

 

Hand-crank flashlights and emergency radios use very little energy, so it’s quite feasible to power them with human motion. But the next time someone tells you that you can power your whole house by riding a stationary bike for an hour, you can tell them that they’re just spinning their wheels. And if anyone tells you about a “miracle power source,” please send the information to me via LinkedIn, Twitter, or Sustainable Energy Today. If it’s interesting enough, I’ll do the analysis and write about it on ENGINEERING.com.

Advertising and marketing at Red Bull Enterprise

Advertising and marketing at Red Bull Enterprise

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