Embedded Switch Mode Power Supplies (SMPS)

A switch mode power supply is a type of electronic circuit used to convert power. They are also known as switching-mode power supplies or SMPS for short. The typical topology of an SMPS is AC to DC conversion, although users may find other switches that feature an output of DC to DC voltage.



How do SMPS work?


For the power supply to transform its input voltage into an output voltage, the switch will turn on and off with high frequency. The inductors or capacitors within the device will then regulate the power to the device. This continuous switching of the capacitor maintains the voltage at the desired level and provides excellent efficiency.



How do SMPS convert AC to DC?


In the case of AC mains usage, the input voltage will be filtered the same way with a capacitor or inductor to regulate the power and give you the DC output.



Which SMPS is best for a desktop PC?


The power supply unit you use in your PC is important as it ultimately determines what other components you can use within it and the output in performance you get at the end. For high-end gaming PC builds you should aim for an efficiency rating of >80%. The higher the rating, the less electricity it consumes. The less electricity used means easier heat dissipation which keeps the PC cool and performing optimally.


Switching power supply units with higher efficiency and lower levels of heat dissipation are typically compact in nature, making them ideal for projects with limited space.



Where are SMPS used?



  • PC/Laptops


  • Mobile phone chargers


  • Security systems such as CCTV Cameras


  • Machine tool industries


...
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Description Price Output Voltage Series Output Current Power Rating Input Voltage Number of Outputs Mounting Type Package Type Length Width Depth Ripple And Noise Load Regulation Weight
RS Stock No. 621-0613
Mfr. Part No.RS-50-24
BrandMean Well
HK$144.18
Each
units
24 V dc - 2.2A 52.8W 88 → 264 V ac, 125 → 373 V dc 1 Chassis Mount Enclosed 99mm 97mm 36mm - - 410g
RS Stock No. 705-9838
Mfr. Part No.SP-240-30RS
BrandMean Well
HK$836.59
Each
units
30 V dc - 8A 240W 88 → 264 V ac, 124 → 370 V dc 1 Chassis Mount Enclosed 190mm 93mm 50mm - - 800g
RS Stock No. 408-4311
Mfr. Part No.V4FFS 24V15A
BrandTDK-Lambda
HK$3,700.00
Each
units
24 V dc - 15A 450W 90 → 264 V ac, 130 → 330 V dc 1 Chassis Mount Enclosed 268.4mm 127mm 63.5mm - - 2kg
RS Stock No. 106-5870
Mfr. Part No.LRS-350-36RS
BrandMean Well
HK$334.61
Each
units
36 V dc - 9.7A 349W 90 → 132 V ac, 180 → 264 (By Switch) V ac, 240 → 370 V dc 1 Chassis Mount Enclosed 215mm 115mm 30mm - - 760g
RS Stock No. 192-1245
Mfr. Part No.LPQ252-C
HK$2,810.48
Each
units
5/±12/±5 → 25V dc - 6 A, 10 A, 35 A 250W 85 → 264 V ac, 120 → 300 V dc 4 Chassis Mount Enclosed 262mm 127mm 76.2mm - - 1.4kg
RS Stock No. 621-0629
Mfr. Part No.RS-50-12
BrandMean Well
HK$171.71
Each
units
12 V dc - 4.2A 50W 88 → 264 V ac, 125 → 373 V dc 1 Chassis Mount Enclosed 99mm 97mm 36mm - - 410g
RS Stock No. 377-6930
Mfr. Part No.LFVLT60-3000
BrandEOS
HK$582.01
Each
units
5.2/12.5 V dc - 3 A, 8 A, 500 mA 60W 90 → 132 V ac, 180 → 264 V ac 3 Chassis Mount Open Frame 101.6mm 51.8mm 27.18mm - - 150g
RS Stock No. 466-7203
Mfr. Part No.TXL 060-24S
BrandTRACOPOWER
HK$476.05
Each
units
24 V dc - 2.5A 60W 85 → 264V ac 1 Chassis Mount Enclosed 109mm 82mm 35mm - - 300g
RS Stock No. 705-9835
Mfr. Part No.SP-240-24RS
BrandMean Well
HK$842.95
Each
units
24 V dc - 10A 240W 88 → 264 V ac, 124 → 370 V dc 1 Chassis Mount Enclosed 190mm 93mm 50mm - - 800g
RS Stock No. 289-5046
Mfr. Part No.LPQ154-C
HK$2,786.46
Each
units
5 ±12/24V dc - 2.5 A, 4.5 A, 8 A, 22 A 110W 85 → 132 V ac, 170 → 264 V ac, 220 → 300 V dc 4 Chassis Mount Enclosed 216mm 108mm 38.1mm - - 800g
RS Stock No. 377-6867
Mfr. Part No.LFVLT40-3202
BrandEOS
HK$439.16
Each
units
5.2/14.6/14.8 V dc - 1.5 A, 6 A, 500 mA 40W 90 → 132 V ac, 180 → 264 V ac 3 Chassis Mount Open Frame 101.6mm 50.8mm 27.18mm - - 150g
RS Stock No. 705-9769
Mfr. Part No.HRPG-300-5RS
BrandMean Well
HK$1,050.12
Each
units
5 V dc - 60A 300W 85 → 264 V ac, 120 → 370 V dc 1 Chassis Mount Enclosed 199mm 105mm 41mm - - 950g
RS Stock No. 377-6952
Mfr. Part No.LFVLT60-3002
BrandEOS
HK$582.01
Each
units
5.2/14.6/16.2 V dc - 2.5 A, 8 A, 500 mA 60W 90 → 132 V ac, 180 → 264 V ac 3 Chassis Mount Open Frame 101.6mm 51.8mm 27.18mm - - 150g
RS Stock No. 815-7472
Mfr. Part No.RSP-500-24RS
BrandMean Well
HK$1,128.10
Each
units
24 V dc - 21A 504W 85 → 264 V ac, 120 → 370 V dc 1 Chassis Mount Enclosed 230mm 127mm 40.5mm - - 1.3kg
RS Stock No. 751-1235
Mfr. Part No.GWS500-12
BrandTDK-Lambda
HK$2,884.54
Each
units
12 V dc - 42A 504W 85 → 265 V ac, 120 → 373 V dc 1 Chassis Mount Enclosed 218mm 105mm 41mm - - 1kg
RS Stock No. 231-7748
Mfr. Part No.CA400 24G
BrandTDK-Lambda
HK$5,025.96
Each
units
24 V dc - 25A 400W 90 → 264V ac 1 Rack Mount Enclosed 279mm 126.5mm 63mm - - 2kg
RS Stock No. 183-0010
Mfr. Part No.LPT42
HK$308.99
Each
units
5/±12 V dc - 2.5 A, 5 A, 700 mA 40W 85 → 264 V ac, 120 → 300 V dc 3 Chassis Mount Open Frame 127mm 76.2mm 29mm - - 230g
RS Stock No. 706-6085
Mfr. Part No.TML 20512
BrandTRACOPOWER
HK$512.91
Each
units
5/±12 V dc - 2.8 A, 250 mA 20W 90 → 264 V ac, 100 → 375 V dc 3 PCB Mount Encapsulated 70mm 48mm 22mm - - 110g
RS Stock No. 706-6151
Mfr. Part No.TML 20512C
BrandTRACOPOWER
HK$610.95
Each
units
5/±12 V dc - 2.8 A, 250 mA 20W 90 → 264 V ac, 100 → 375 V dc 3 Chassis Mount Encapsulated 96mm 54.6mm 27.6mm - - 155g
RS Stock No. 777-2862
Mfr. Part No.RSP-320-36
BrandMean Well
HK$647.50
Each
units
36 V dc - 8.9A 320W 88 → 264 V ac, 124 → 370 V dc 1 Chassis Mount Enclosed 215mm 115mm 30mm - - 900g