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POWER SUPPLIES FOR A SMARTER WORLD

The Internet of Things (IoT) is an umbrella term that covers many groups of related concepts, but in essence, these concepts share the following features: distributed intelligence, multiple interconnected sensors/actuators and decentralized control. In practice, IoT means that certain spaces, environments or objects can be made “smart” by incorporating sensors that can communicate to make them behave intelligently. IoT examples include offices that adjust themselves to ambient light levels or to human presence, machines that monitor their own health or homes that learn our daily routines to automatically save energy without compromising on our comfort.

All of this new technology needs power: either highly efficient, low standby consumption AC/DC power supplies that can be used in a smart office with hundreds of intelligent sensor nodes, very low input current switching regulators that can scavenge power from the output of a wired sensor, low cost isolated DC/DC power supplies for multiple input channels or a very low input voltage boost converter to generate a useful power supply from a single battery cell. Not every power supply is suitable for an IoT application. They must be highly efficient at both low load and full load, they must be space-saving, they must be reliable and, above all, they must be affordable as they will be as ubiquitous as the sensors, processors and actuators that they supply. The following selection of RECOM power supply products have been chosen because they meet all of these basic requirements.

Low profile & low cost AC/DC converters (1-2W)

IoT will be ubiquitous, requiring many small AC/DC supplies to power the sensor networks. The RAC series are low cost, compact, efficient low power supply modules ideally suited to IoT installations. They have low standby power requirements, yet can deliver up to 175% peak load. They work from all standard AC power supply voltages and are fully certified to worldwide standards, including the 60355-1 household norm.

Data
sheet
Part number Power
(W)
Vin Vout
(VDC)
Iout
(mA)
Outputs Case Isolation
(kV)
Short
Circuit
Protection
BUY
RAC01-05SGA 1 85-264 VAC 5 200 1 Standard 3 yes
RAC01-12SGA 1 85-264 VAC 12 83 1 Standard 3 yes
RAC01-05SGB 1 85-264 VAC 5 200 1 Standard 3 yes
RAC01-12SGB 1 85-264 VAC 12 83 1 Standard 3 yes

Data
sheet
Part number Power
(W)
Vin Vout
(VDC)
Iout
(mA)
Outputs Case Isolation
(kV)
Short
Circuit
Protection
BUY
RAC02-05SGA 2 85-264 VAC 5 400 1 Standard 3 yes
RAC02-12SGA 2 85-264 VAC 12 167 1 Standard 3 yes
RAC02-05SGB 2 85-264 VAC 5 400 1 Standard 3 yes
RAC02-12SGB 2 85-264 VAC 12 167 1 Standard 3 yes

Low profile AC/DC converters (2-3W)

In large US office blocks, the lighting supplies are often powered from a 277VAC supply. The RAC-SE series have an extra wide input voltage range to cover 90-305VAC supplies to enable intelligent lighting and smart office/ smart building applications. In addition, the RAC03-SER has a unique round shape only 11mm thick to allow mounting inside a standard wall box behind a socket or switch plate. As befitting a power supply meant for worldwide applications, the SE series are IEC/EN/UL safety certified for industrial and household applications.

Data
sheet
Part number Power
(W)
Vin Vout
(VDC)
Iout
(mA)
Outputs Case Isolation
(kV)
Short
Circuit
Protection
BUY
RAC03-05SER/277 3 85-305 VAC 5 600 1 Standard 3 yes

Very low power switching regulators

The R-78S switching regulator has been specially designed for single-cell powered IoT applications. Due to their wide input voltage range, high efficiency and low stand-by losses, they extend not only the working lifetime of the cell, but also maintain a stable 3.3V output down to “the last gasp” battery voltage. Based on the simple plug-and-play concept of the standard R-78 buck regulator, the R-78S boost regulator is able to provide a stable 3.3VDC output from an input voltage down to 0.65V, allowing a single battery cell to power IoT nodes, Bluetooth-enabled sensors or long range LoRaWAN remote data transmitters.

Data
sheet
Part number Power
(W)
Vin Vout
(VDC)
Iout
(mA)
Outputs Case Isolation
(kV)
Short
Circuit
Protection
BUY
R-78S3.3-0.1 0.33 0.65-3.15 VDC 3.3 100 1 SIP4 yes

The R420-1.8/PL is an application-specific switching regulator designed to scavenge power from a 4-20mA loop sensor system. Unlike linear regulators, the R420 can deliver up to three times as much current without influencing the 4-20mA signal. This allows new features to be added to traditional analogue loop sensors such as local displays, digital signal processing or HART modem technology, all without requiring a remote auxiliary power supply. By making 4-20mA sensors smart, the advantages of Industry 4.0 can be extended into large processing plants, chemical factories and refineries.

Data
sheet
Part number Power
(W)
Vin Vout
(VDC)
Iout
(mA)
Outputs Case Isolation
(kV)
Short
Circuit
Protection
BUY
R420-1.8/PL 0.02 10-36 VDC 1.8-5 10 1 open Frame yes