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Voltage Regulated Power Supply With Current Limiting

IP.com Disclosure Number: IPCOM000084006D
Original Publication Date: 1975-Sep-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Glueck, HW: AUTHOR [+2]

Abstract

An inductor is connected between a power supply transformer secondary winding and a rectifier bridge to provide current limiting protection to the transformer windings during short circuits in the load, and to the rectifier components during each half cycle of normal operation and during short-circuit conditions.

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Voltage Regulated Power Supply With Current Limiting

An inductor is connected between a power supply transformer secondary winding and a rectifier bridge to provide current limiting protection to the transformer windings during short circuits in the load, and to the rectifier components during each half cycle of normal operation and during short-circuit conditions.

In Fig. 1, power transformer 1 includes primary winding 2 connected to alternating-current source 3. Rectifier bridge 6 is connected through series inductor 5 to secondary winding 4 of transformer 1. Bridge 6 includes conventional diodes 7 and 8 and silicon-controlled rectifiers (SCR's) 9 and 10. A full wave, rectified output voltage is present at terminal 11 and filtered by capacitor 12.

The output voltage at terminal 11 is connected to constant-voltage control circuit 13, which is a phase-control regulator. The output of circuit 13 is connected to regulator transformer winding 14, which controls the conduction of SCR's 9 and 10 through regulator transformer windings 15 and 16. Circuit 13, therefore, provides voltage regulation by controlling the percentage of each half cycle of the unrectified secondary voltage waveform that is allowed to be rectified, filtered, and applied to terminal 11.

Placement of inductor 5 between winding 4 and bridge 6, rather than between bridge 6 and capacitor 12, allows a much smaller inductor to be used for limiting the peak currents in the bridge 6 components during each...