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GB929780A - Improvements in or relating to electrical power supplies - Google Patents

Improvements in or relating to electrical power supplies

Info

Publication number
GB929780A
GB929780A GB3005959A GB3005959A GB929780A GB 929780 A GB929780 A GB 929780A GB 3005959 A GB3005959 A GB 3005959A GB 3005959 A GB3005959 A GB 3005959A GB 929780 A GB929780 A GB 929780A
Authority
GB
United Kingdom
Prior art keywords
terminal
base
current
resistor
emitter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3005959A
Inventor
Martin Andrew Weston
Colin Ian Sach
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SECR AVIATION
Minister of Aviation
Original Assignee
SECR AVIATION
Minister of Aviation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SECR AVIATION, Minister of Aviation filed Critical SECR AVIATION
Priority to GB3005959A priority Critical patent/GB929780A/en
Publication of GB929780A publication Critical patent/GB929780A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
    • G05F3/02—Regulating voltage or current
    • G05F3/08—Regulating voltage or current wherein the variable is DC
    • G05F3/10—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics
    • G05F3/16—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices
    • G05F3/18—Regulating voltage or current wherein the variable is DC using uncontrolled devices with non-linear characteristics being semiconductor devices using Zener diodes

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Continuous-Control Power Sources That Use Transistors (AREA)
  • Dc-Dc Converters (AREA)

Abstract

929,780. Automatic voltage and current control systems. MINISTER OF AVIATION. Sept. 1, 1960 [Sept. 3, 1959], No. 30059/59. Class 38 (4). In the electric power supply circuit shown, stabilized voltages are taken from terminals A3, A5. A6 and A4 across Zener diodes D2, D3 and D4 when an unregulated supply voltage is connected across terminals A1 and A2, and a transistor Q is provided having its emitter connected over a resistor R1 to terminal A1, its collector connected to terminal A3, and its base connected over a resistor R2 to terminal A2, a Zener diode D1 being connected between terminal A1 and the transistor base. If the supply voltage increases, the voltage across D1 will remain substantially constant but the increase in current through resistor R1 will decrease the bias between emitter and base and the supply current will then tend to decrease. Thus the emitter and collector currents tend to remain constant and the current through diodes D2, D3 and D4 will also remain constant giving better stabilisation of the output voltage. A Zener diode D5 connected between the base and collector electrodes protects the transistor during transient conditions. Reference has been directed by the Comptroller to Specification 877,496.
GB3005959A 1959-09-03 1959-09-03 Improvements in or relating to electrical power supplies Expired GB929780A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3005959A GB929780A (en) 1959-09-03 1959-09-03 Improvements in or relating to electrical power supplies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3005959A GB929780A (en) 1959-09-03 1959-09-03 Improvements in or relating to electrical power supplies

Publications (1)

Publication Number Publication Date
GB929780A true GB929780A (en) 1963-06-26

Family

ID=10301592

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3005959A Expired GB929780A (en) 1959-09-03 1959-09-03 Improvements in or relating to electrical power supplies

Country Status (1)

Country Link
GB (1) GB929780A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1107502A3 (en) * 1999-12-09 2003-05-07 Pitney Bowes Inc. System and method for preventing differential power analysis attacks (DPA) on a cryptographic device
US6748535B1 (en) 1998-12-21 2004-06-08 Pitney Bowes Inc. System and method for suppressing conducted emissions by a cryptographic device comprising an integrated circuit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6748535B1 (en) 1998-12-21 2004-06-08 Pitney Bowes Inc. System and method for suppressing conducted emissions by a cryptographic device comprising an integrated circuit
EP1107502A3 (en) * 1999-12-09 2003-05-07 Pitney Bowes Inc. System and method for preventing differential power analysis attacks (DPA) on a cryptographic device
US6766455B1 (en) 1999-12-09 2004-07-20 Pitney Bowes Inc. System and method for preventing differential power analysis attacks (DPA) on a cryptographic device

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