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Designing Power Supply Circuit

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Robust Electronic Design Reference Book

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24.1 Designing Power Supply Circuits

Power supplies tend to be our worst conducted-noise sources, but usually aren't particularly sensitive to electrical noise. Switching power supplies frequently dominate conducted-noise emissions up to about 30MHz. Linear power supplies tend to be quiet, but rarely offer much input-to-output and output-to-input isolation against transients or high-frequency noise. Conducted emissions from both types of power supplies can vary up to 15dB unit-to-unit if they have poor input filtering, from turn-off spiking of the input rectifiers.

Standard design requirements for power supply circuits include:

  • Number of outputs.

  • Isolated or non- isolated outputs.

  • Alternating-current (AC) or direct-current ( DC) output(s).

  • Output voltage(s).

  • Tolerance(s) on output voltage(s).

  • Output-voltage tracking.

  • Fixed/ adjustable/ variable/ programmable output voltage(s).

  • Maximum and minimum output current(s).

  • Fixed/adjustable/variable/programmable output-current limiting.

  • Single...

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  1. John R. Barnes
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© 2004 Kluwer Academic Publishers

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Barnes, J.R. (2004). Designing Power Supply Circuit. In: Barnes, J.R. (eds) Robust Electronic Design Reference Book. Springer, New York, NY. https://doi.org/10.1007/1-4020-7830-7_24

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  • DOI: https://doi.org/10.1007/1-4020-7830-7_24

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  • Publisher Name: Springer, New York, NY

  • Print ISBN: 978-1-4020-7739-5

  • Online ISBN: 978-1-4020-7830-9

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