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AC/DC Power Supplies

Future Electronics is proud to offer a wide range of AC/DC Power Supplies and Wall Adapter power supply solutions from leading Power Supply manufacturers including: Altech Corporation, Bias Power, Cosel, Friwo, Mean Well, Murata Power, Power One, Recom Power, SL Power (Condor & Ault), Triad Magnetics, Vicor, Wall Industries, and more.

What are Linear and Switching Power Supplies?

There are two main types of regulated power supplies available:

A switch-mode power supply (switching-mode power supply or SMPS) is an electronic power supply that uses a switching regulator in order to control the conversion of electrical power in a highly efficient manner. This higher efficiency (thus lower heat dissipation) is the chief advantage of a switched-mode power supply.

A linear regulated power supply, on the other hand, regulates the output voltage by dissipating excess power in Ohmic losses (by use of a resistor or a pass transistor in its active mode). Because a linear regulator regulates either output voltage or current by dissipating the excess electric power in the form of heat, its maximum power efficiency is voltage-out/voltage-in. To function properly, a moderately complex regulator circuit is used to achieve low load and ensure line regulation. Another benefit is linear regulated power supplies also have very little ripple and very little output noise (also known as EMI and RFI).

In short, switching regulators are used as replacements for the linear regulators when higher efficiency, smaller size or lighter weight is required. They are, however, more complicated, as their switching currents can cause electrical noise problems if not carefully suppressed, and simple designs may have a poor power factor. Generally more costly, SMPS justify their cost based on performance a, reliability and size when compared with similarly related Linear Power Supplies.

Our technical staff has a wealth of experience is migrating AC DC power supply solutions from Astec, Artesyn and Emerson Power to significantly better power solutions from Abracon, Altech Corporation, Ault, Bias Power, Cosel, Condor (SL Power), Power One, Mean Well, Recom Power Inc, Rohm, ST, TDK Lambda, Triad Magnetics, Vicor Corporation, Wago and Wall Industries. Call your local branch for engineering support.

The following table outlines key differences between Linear and Switching Power Supplies:


Specification Linear Regulated Power Supply Switching Regulated Power Supply
Size and weight Heatsinks for high power linear regulators add size and weight. Transformers, if used, are often large due to low operating frequency (mains at 50 or 60 Hz). Smaller transformer or inductor due to higher operating frequency (typically 50 kHz – 1 MHz). Size and weight of adequate RF shielding may be significant. Smaller and lighter than Linear Power supplies.

Output voltage

A regulated Linear Supply’s output voltage has negligible ripple, very small load regulation, and high reliability, thus making it an ideal choice for use in low power electronic applications.

Limited only by transistor breakdown voltages in many circuits. Voltage varies little with load. Output voltage ripple is a disadvantage, which is generally handled with bypass capacitance near the supply and at the load.

Efficiency, heat, and power dissipation

Efficiency depends on voltage difference between input and output;

output voltage is regulated by dissipating excess power as heat, resulting in a typical efficiency of 30–40%.
Output is regulated using duty cycle control; the transistors are switched fully on or fully off, so very little resistive losses between input and the load. The clear advantage of switching regulators is efficiency, typically 65-90% or higher.

Complexity

Usually comprised of a transformer, rectifier, filter capacitor, and a bleeder resistor or 3 terminal voltage regulators. A much simpler circuit than switched-mode circuits.

Some design complexities present (reducing noise / interference; extra limitations on maximum ratings of transistors at high switching speeds) not found in linear regulator circuits.

RF/EMI Interference

Mild high-frequency interference may be generated by AC rectifier diodes under heavy current loading. Some mains hum induction into unshielded cables may be problematical for low-signal audio.

EMI/RFI produced due to the current being switched on and off sharply. Therefore, EMI filters and RF shielding are needed to reduce the disruptive interference.

Electronic noise at the output terminals (Hum/Ripple)

Unregulated PSUs may have a little AC ripple superimposed upon the DC component at twice mains frequency (100–120 Hz). Can cause audible mains hum in audio equipment or brightness ripples or banded distortions in analog security cameras. Ripple can be usually 0.25 to 1.5 mv.

Noisier due to the switching frequency of the SMPS. An unfiltered output may cause glitches in digital circuits or noise in audio circuits. From 10 to 25 mv ripple in some cases.

Cooling

Convection or fan

Convection

Part Count

Typically low to medium

Usually high

Power factor

Low for a regulated supply because current is drawn from the mains at the peaks of the voltage sinusoid, unless a choke-input or resistor-input circuit follows the rectifier (now rare). Can be 0.6 to 0.7.

Ranging from very low to medium since a simple SMPS without PFC draws current spikes at the peaks of the AC sinusoid.
0.6 to 0.7 without PFC otherwise can be >0.95 with PFC.

Wall Adapters Power Supplies

An adapter is a portable external power supply that is often enclosed. Other names include plug pack, plug-in adapter, adapter block, domestic mains adapter, line power adapter, or power adapter. Informal terms include wall wart, wall cube and power brick. Future Electronics offers a wide range of wall adapters. We offer a wide selection of SL Power (Ault brand) and Mean Well AC/DC adapters.

External power supplies are used both with equipment with no other source of power, and with battery-powered equipment, where the supply both charges the battery and powers the equipment when plugged in. One of the benefits of using an external, rather than internal power supply is it increases the portability of a device, by avoiding the need of internal power components.

Choosing the Right Power Supply

When you do a search for Power Supplies on our website, no matter if you need a AD/DC Switching Power Supply (open frame or enclosed) or a Wall Adapter, we offer a wide selection of products including choices of a 12VDC power supply or 24VDC power supply.

Best of all, when you are looking for the right power supply for your application, you can filter the results by various attributes: by Type (adapter, charger, open frame, enclosed), by number of outputs (dual, five, quad), by output power (1W, 10W, 50W, 75W, 100W, 300W), by output voltage (5 V, 12 V, 15 V, 48 V) or by input voltage (85 to 132 V, 85 to 256 V, 100 to 250 V, 100 to 264 V).

Applications for Power Supply

One of the great things about our product offering is that we can support your needs by the technology you are working on. Whether it is for a special need for a Medical Power Supply or just a generic Universal Input Power Supply, we probably have a power supply solution for you.

Other power supply applications and uses include: low noise amplifiers, signal processing, data acquisition - including sensors, automatic test equipment, laboratory test equipment, control circuits. In short, Future Electronics has the right power supply solution for you.

Power Supplies in R&D Quantities or Production Ready Packaging

With our state-of-the-art facility in Memphis and FutureElectronics.com, you have the option to order the exact number of power supplies required for your R&D or electronic project needs without the unnecessary surplus of buying full boxes.









Featured AC/DC Power Supply Products


Manufacturer Part Number Description
SL Power Electronics Condor Brand GLC75PG GLC Series 75 W Quad Output +5.1/+24/-12/+12 V AC/DC Global Performance Switcher
SL Power Electronics Condor Brand HC24-2.4-A+G HC Series Single Output 24 V Commercial AC/DC Isolated Power Supply
Mean Well PLC-100-24 100 W AC/DC Single Output 24 V Class 2 LED Driver with Built-in PFC Function
SL Power Electronics Ault Brand PW153KB2403F01 PW153KB Series 100 - 240 Vac 40.8 W 24 Vdc Switch Mode Power Supply
SL Power Electronics Ault Brand PW173KB0903F01 PW173KA Series 100 - 240 Vac 27 W 9 V AC/DC Switch Mode Power Supply
SL Power Electronics Condor Brand F24-12-A+G F24 Series Single Output 24 V Commercial AC/DC Isolated Power Supply
SL Power Electronics Condor Brand HCBB-75W-A+G HCBB Series Triple Output 5/+12 to 15/-12 to 15 V AC/DC Isolated Power Supply
SL Power Electronics Ault Brand MW174KB2403F01 MW174KB Series 100 - 240 Vac 64.8 W 24 Vdc Medical Switch Mode Power Supply
Power One PFC500-1028F 500 W Single Output 28 V Logic Level Inhibit Enclosed Switching Power Supply
Recom Power Inc. RAC20-12SB Americas Only - 20 W Single Output 12 V Short Circuit Protect AC/DC Power Supply
Recom Power Inc. RAC10-12SB Americas Only - 10 W Single Output 12 V Short Circuit Protect AC/DC Power Supply
Power One HB5-3/OVP-AG 15 W Single Output 5 V AC/DC Low Output Ripple Linear Power Supply
Power One MPB125-4350G 125 W Quad Output 3.3 / 5 / 12 / -12 V Switching Open Frame Power Supply
Mean Well NFM-15-5 NFM-15 Series 15 W Single Output 5V AC/DC Ultra Miniature Switching Power Supply
Mean Well RPS-60-24 RPS-60 Series 60 W Single Output 24 V AC / DC Medical Type Power Supply
Mean Well PLC-100-20 100 W AC/DC Single Output 20 V Class 2 LED Driver with Built-in PFC Function
SL Power Electronics Condor Brand GLM75PG GLM Series 75 W Quad Output +5.1/+24/-12/+12 V AC/DC Global Performance Switcher
Mean Well PD-65A 61.1 W Dual Output 5 V / 12 V Fixed Frequency Switching Power Supply
Recom Power Inc. RAC04-12SA Americas Only - 4 W Single Output 12 V Short Circuit Protect AC/DC Power Supply
SL Power Electronics Ault Brand MW155RA2451F01 MW155RA Series 100 - 240 Vac 120 W 24 Vdc AC/DC Single Output Medical Adapter
Mean Well RS-25-12 25.2 W Single Output 12 V AC/DC High Efficiency Switching Power Supply
Mean Well S-240-12 216 W Single Output 12 V AC/DC Fixed Frequency Switching Power Supply
SL Power Electronics Ault Brand PW173KB0903B01 PW173KA Series 100 - 240 Vac 27 W 9 V AC/DC Switch Mode Power Supply
Cosel LEP240F-24 240 W Low Cost Single Output 24 V Internal AC/DC Switching Power Supply
Power One MAP80-4002 80 W Quad Output 5 V/12 V/-12 V/12 V U-Channel Chassis Power Supply
SL Power Electronics Condor Brand GSM11-5AAG GSM Series 11 W Single Output 5.1 V Medical AC/DC Universal Input Power Supply
SL Power Electronics Condor Brand GNT60-12G GNT Series 60 W Single Output 12 V Medical AC/DC Universal Input Power Supply
SL Power Electronics Condor Brand MINT1065A2475C01 MINT Series 65 W Single Output 24 V AC/DC Universal Input Medical Power Supply
Cosel YAW1015E YAW10 Series 10.5 W Dual Output ±15 or 30 V AC/DC PCB Mount Power Supply
Cosel PBA300F-24 PBA300F Series 324 W Single Output 24 V AC/DC Enclosed Type Power Supply
Cosel LEB225F-0524-SN LEB225F Series 100 W Dual Output 5 /24 V AC/DC Enclosed Type Power Supply

Cosel, Condor Power, Power One, Ault, Mean Well (often misspelled as Meanwell Power Supply), AC DC Power Supply, Switch Mode Power Supply, Linear Power Supply, Universal Power Supply, Open Frame Power Supply, External Power Power Supply

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