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Three Phased Forced Limit Cycle Regulator

IP.com Disclosure Number: IPCOM000091650D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Trubell, LP: AUTHOR

Abstract

This high-current power supply is regulated to close tolerances between zero and full load. The supply comprises three-phase transformer 10 having delta-connected primary windings 12 and star-connected secondary windings 14, 16, 18, 24, 26, and 28. The secondary windings are interconnected by interphase transformer 30. Full-wave rectification is provided by silicon controlled rectifiers SCR's 34, 36, 38, 44, 46, and 48. Choke input filtering is performed by inductor 52 and capacitor 54. The output voltage is delivered at the terminals of bleeder resistor 56.

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Three Phased Forced Limit Cycle Regulator

This high-current power supply is regulated to close tolerances between zero and full load. The supply comprises three-phase transformer 10 having delta- connected primary windings 12 and star-connected secondary windings 14, 16, 18, 24, 26, and 28. The secondary windings are interconnected by interphase transformer 30. Full-wave rectification is provided by silicon controlled rectifiers SCR's 34, 36, 38, 44, 46, and 48. Choke input filtering is performed by inductor 52 and capacitor 54. The output voltage is delivered at the terminals of bleeder resistor 56.

Regulation is effected by control of the SCR's. With all of the SCR's turned on, the circuit behaves as a conventional three-phase bridge rectifier. With the SCR gate electrode voltages removed, the SCR's are commutated off and the output voltage decreases toward zero. The proper rate for turnon and turnoff of the SCR's is established by a central circuit comprising Schmitt trigger 60. A voltage proportional to the instantaneous voltage of the power supply is applied to sensing transistor 62 by way of potentiometer 64 and reference voltage zener diode 66.

Speed-up capacitor 68 allows immediate response to an output voltage change. Conventional bias supply 70 is provided for the central circuit. Preferably, additional windings on transformer 10 form the source of energy. Transistors 72 and 74 are connected in the Schmitt trigger circuit controlling the conduction of d...