Switch-Mode Power Supplies
A Switch-Mode Power Supply (also referred to as SMPS), the AC mains input is directly rectified and then filtered to obtain a DC voltage. The resulting DC voltage is then switched on and off at a high frequency by electronic switching circuitry, thus producing an AC current that will pass through a high-frequency transformer or inductor.
Switching occurs at a very high frequency (typically 10 kHz to 1 MHz), thereby enabling the use of transformers and filter capacitors that are much smaller, lighter, and less expensive than those found in linear power supplies operating at mains frequency. After the inductor or transformer secondary, the high frequency AC is rectified and filtered to produce the DC output voltage.
The benefits of a Switched-Mode Power Supply compared to a Linear Power Supply are a relatively low cost, very compact size and very high efficiencies in excess of 80 %. The trade-off however is that due to the switching nature of these Power Supplies, they are very noisy with a typical Ripple & Noise specification of 1 % of nominal output Voltage. Additional output filtering can of course be implemented by the user to significantly improve this.
Accutronics offers a range of Switch-Mode Power Supplies that are Chassis-mount or PCB-mount and with output power up to 15 kW.
Accutronics represents the following manufacturers of Switch-Mode Power Supplies:
Please contact us for more information on these products.
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