Super compensated voltage control of redundant D.C. power supplies

• US 4,035,716 A
• Filed: 03/31/1976
• Issued: 07/12/1977
• Est. Priority Date: 03/31/1976
• Status: Expired due to Term

• Current Assignee: AG Communication Systems Corp. (Nokia Corporation)
• Original Assignee: GTE Automatic Electric Laboratories Incorporated
• Inventors: Hutchinson, Homer F.
• Primary Examiner(s): Goldberg, Gerald
• Application Number:
  US05/672,101
• Time in Patent Office: 468 Days
• Field of Search: 323/17, 323/20, 323/21, 323/22 T, 323/23, 323/25, 323/DIG. 1, 307/44, 307/45, 307/51, 307/52, 307/58, 307/64, 307/77, 307/80, 307/82, 307/85, 307/87, 317/33 VR, 317/33 SC, 321/2, 321/27 R
• US Class Current: 307/82
• CPC Class Codes: H02J 1/102 being switching converters H02J1/108, H02J1/12 take precedence
• CPC Class Codes: H02J 1/108 using diodes blocking reverse current flow H02J1/12 takes precedence

Abstract

A power supply system is disclosed wherein redundant D.C. power supplies are provided for a single load, each of the supplies being capable of providing full load current so that one of the supplies may be removed without interrupting power to the load. Each of the power supplies has a differential amplifier type of voltage regulator that includes a resistor in series with the output lead so that it is capable of varying the output voltage to compensate for lead and OR-ing rectifier drops.

Claims

1. A direct current potential regulated power supply system to which a load can be attached comprising:

first and second D.C. power supplies for parallel connection to the load;

each of said supplies including voltage regulating means and a first and second load lead to which the load conductors can be attached;

a first diode means connected in said second load lead of each of said supplies so that the diode is biased into conduction when voltage is applied to the load through the load conductors, a control circuit for each of said supplies for sensing the output voltage and for regulating the voltages of each of said supplies comprising a differential amplifier including a first transistor having a base, an emitter, and a collector connected to said first load lead, a first resistor and a zener diode in series connected between said first and said second load lead before said first diode means, said first transistor base connected between said first resistor and zener diode, a second resistor, a variable resistor and a third resistor in series connected between said first load lead and said second load lead, a second transistor having an emitter, a base connected between said variable resistor and said third resistor, and a collector connected to said voltage regulating means, said emitters of said first and second transistors connected together and via a fourth resistor to said second load lead, and a fifth resistor connected in series in said second load lead before said first diode means to sense an increase in output current to cause an increase in output voltage, and further including a potentiometer having a first and a second end terminal connected respectively between said second resistor and said variable resistor of said first and said second power supply, and a tap terminal connected to said first load lead to increase the output of one of said supplies while decreasing the output of the other dependent upon the position of said tap along said potentiometer.

2. A direct current potential regulated power supply system as claimed in claim 1, wherein each of said power supplies includes a silicon controlled rectifier means having an anode connected to one of said load leads and a cathode connected to the other load lead, and a control terminal connected to the anode via a reference diode so that when the voltage level of said supply exceeds a predetermined value, said reference diode conducts current to trigger said silicon controlled rectifier into conduction to decrease said output voltages to a low value and said first diode means is reversed biased to thereby isolate said one power supply from said load.