Low power high efficiency switching power supply

Details Low power high efficiency switching power supply Low power high efficiency switching power supply

H - Electricity

02

M

321/32

H02M 3/337 (2006.01)

Patent

CA 1273397

LOW POWER HIGH EFFICIENCY SWITCHING POWER SUPPLY ABSTRACT OF THE DISCLOSURE A low power high efficiency switching power supply comprises a switching transducer having primary and secondary windings. The primary wind is supplied with a primary voltage over a series connected constant current source and Zener diode. The primary voltage is chopped by an FET which has a gate connected to an oscillator operating at relatively low frequency. The secondary windings of the transformer are connected to full-wave rectifiers which convert the A.C. signal produced by the chopping of the primary voltage, into a D.C. signal. Efficiency is maximized by using fast switching FET's and low flux densities in the transformer. The power supply is particularly useful in 4-20 mA current loops. - 10 -

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