The smart way to save power

For centuries humans have tried to preserve food through refrigeration. The fridge introduced a new level of convenience to homes and now, thanks to intelligent power control, is also economical. It sets an example for other electric domestic helpers to follow.

Ice cutter in 19th century

From ice box to cool cabinet

A cold, biting wind blew through on a gray November morning in 1806.
Snowflakes fell on gigantic blocks of ice, waiting in stacks on the shore of the frozen lake. A few men had already hoisted the first blocks onto the ramp and into the carriage, led by four horses. Soon the blocks were ready to start off on a long journey – from New England to the hot Caribbean.

Preserving food through refrigeration and enjoying chilled beverages was already practiced in antiquity by harvesting ice from mountainous regions and storing it deep in the ground in ice cellars. Beginning in the 19th century, the ice trade rapidly gained importance. Huge amounts of time and effort were invested cutting large ice blocks from frozen lakes and rivers, shaping them to size and shipping them long distances by sea.

Children with iceman in Berlin, 1957.

Refrigerating foods became easier and more comfortable after researchers successful made artificial ice – by combining chemicals, some of them toxic, with a technical process. This, of course, ultimately led to the invention of the refrigerator. Already back in the 1930s, electric fridges were widespread in the USA and Cuba. In contrast, the iceman continued delivering ice to German households well into the 1950s. The ice kept food cool in specially lined wooden cabinets.

Be it manpower, chemicals, or generating electricity to power fridges, the luxury of refrigeration requires a lot of effort – and affects the environment.

Energy-guzzling home appliances

Every day we use a variety of appliances in our homes. From washer, to dryer, to air conditioner, to fridge, they all add simplicity and convenience to daily life. Until now, these appliances have shared one common trait: a motor with two states, “on” and “off”. Accordingly, it had two power levels, all or nothing. Full power meant consuming the highest possible amount of energy. The cost of these electric domestic helpers reaches far beyond the price tag to include the cost of electricity over an appliances’ lifespan. For instance, in 2015 there were an estimated 1.2 billion old, loud, energy-guzzling fridges still in use worldwide. Each one consumes around 480 kilowatt hours (kWh) per year.

Switch on your brain, don’t give up the ghost

Evening has come and you’re at home, settled on the sofa and engrossed in a book. Suddenly, you hear a faint gurgling sound but have difficulty locating it. In one fell swoop, a metal clang and a deep, gurgling rattle begins. Your moment of peace and relaxation is over. Time and again, the fridge reminds you of its presence, with increased frequency and volume. Apparently, the fridge is quite the extrovert – or is suffering from wear.

Because motors of non-inverterized appliances can’t regulate their speed, they always run at full power. This wears out components much quicker – and makes them more susceptible to failure. Moreover, these devices are noisy, a characteristic that can get on your nerves.

Overview of challenges

Early wastage of components, loudness and high energy consumption, and therefore high cost, are the major challenges of conventional refrigerators.

Motors must be intelligently controlled so they perform just as required.

But shouldn’t we expect home appliances to be kind of smart? For instance, by consuming only as much electricity as they actually need – because they know precisely when and how much is required to run. The necessary intelligence is already available today and a growing number of various appliances are fitted with the technology. Chips from Infineon make them smart thanks to the interaction of sensors, microcontrollers and power chips. Combining these different semiconductors allows optimal regulation of the current flow. Technology experts call this a frequency inverter - or simply inverter.

Small components with big effects

The principle is simple: by constantly gathering data, such as temperature, humidity and motor rotational speed, sensors enable an appliance to run efficiently. Based on this data, a mini computer, or microcontroller, calculates the control commands required. Power chips, true energy savers, implement these for the motor’s optimum rotational speed, keeping the fridge’s temperature constant. This is much more efficient than always turning the motor on or off.

We are aiming at intelligent household appliances to become the standard in the future. For this, Infineon is developing semiconductors that are cornerstones to inverterization - such as sensors, microcontrollers and highly efficient power chips.

Find an overview of all products online in the home appliances section.

Infineon’s range of semiconductors for inverterization contributes to a future-oriented, eco-friendly technology that benefits us all.

Daniel Scharfen, Head of Business Development

Benefits of inverterization, at a glance

Inverterization provides some crucial advantages: Higher durability through gently starting engines, less operating hours under constant load, as well as lower mechanical attrition. Also loudness is being reduced because of non-permanent operation under full load. Moreover inverter technology provides specific and efficient usage of available energy and 20-30% less power consumption.

Video: From the stove at home to out in the world

The number of inverterized home appliances is expanding rapidly. Strict energy-efficiency guidelines in many countries have led some manufacturers to exclusively produce appliances with inverters. Fitted with tiny sensors, microcontrollers and power chips from Infineon, these appliances run quieter, last longer and, most importantly, consume less energy. The net effect: appliances that are better for the environment. See for yourself in the video which appliances can benefit from inverterization.

Further Information