MY112587A - High impedance power supply - Google Patents

High impedance power supply

Info

Publication number
MY112587A
MY112587A MYPI95000673A MYPI19950673A MY112587A MY 112587 A MY112587 A MY 112587A MY PI95000673 A MYPI95000673 A MY PI95000673A MY PI19950673 A MYPI19950673 A MY PI19950673A MY 112587 A MY112587 A MY 112587A
Authority
MY
Malaysia
Prior art keywords
current
power supply
sensing means
paths
circuit
Prior art date
Application number
MYPI95000673A
Inventor
Murray Terrace Donald
Original Assignee
Clipsal Australia Pty Ltd
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 Clipsal Australia Pty Ltd filed Critical Clipsal Australia Pty Ltd
Publication of MY112587A publication Critical patent/MY112587A/en

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
    • G05F3/20—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using diode- transistor combinations
    • G05F3/26—Current mirrors
    • G05F3/265—Current mirrors using bipolar transistors only

Landscapes

  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Electrical Variables (AREA)
  • Amplifiers (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Interface Circuits In Exchanges (AREA)

Abstract

AN ELECTRICAL POWER SUPPLY FOR A TWO-WIRE POWER AND COMMUNICATIONS NETWORK IS DISCLOSED (FIG 3).A CONSTANT CURRENT SOURCE IS DESIRABLE WHICH ALSO EXHIBITS HIGH INPUT IMPEDANCE AT THE FREQUENCY OF OPERATION OF THE TWO-WIRE COMMUNICATION NETWORK. THE INVENTION DISCLOSED USES A NOVEL COMBINATION OF THE CURRENT MIRROR PRINCIPLE AND A NEGATIVE FEEDBACK LOOP IN ORDER TO ACHIEVE THE REQUISITE REGULATION OF CURRENT AND HIGH INPUT IMPEDANCE.CURRENT MIRROR CIRCUIT (QL, Q4) HAS A CURRENT FLOW CONTROL PORTION (Q4) AND TWO CURRENT PATHS, WHERE IN THE FIRST CURRENT PATH THERE IS A CURRENT REFERENCE (Z3) AND IN THE SECOND CURRENT PATH THERE IS A CURRENT SENSING MEANS (R6). A FEEDBACK CIRCUIT IS PROVIDED FROM THE CURRENT FLOW CONTROL PORTION (Q4) OF THE CURRENT MIRROR CIRCUIT (QL, Q4) TO BOTH THE FIRST AND SECOND CURRENT PATHS, WHERE THE FEEDBACK CIRCUIT REGULATES THE CURRENT IN THE CURRENT SENSING MEANS (R6) SO THAT THE TOTAL VOLTAGE DROP ACROSS THE CURRENT SENSING MEANS (R6) AND THE FEED BACK CIRCUIT IS MATCHED TO THE VOLTAGE DROP ACROSS THE CURRENT REFERENCE MEANS (Z3).ADDITIONAL CURRENT CARRYING PATHS (RS, Q3, 13) CAN BE ADDED TO THE CONSTANT CURRENT POWER SUPPLY TO INCREASE THE TOTAL CURRENT PROVIDED BY THE POWER SUPPLY INTO THE(FIG.3)
MYPI95000673A 1994-03-21 1995-03-17 High impedance power supply MY112587A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AUPM4577A AUPM457794A0 (en) 1994-03-21 1994-03-21 High impedance power supply

Publications (1)

Publication Number Publication Date
MY112587A true MY112587A (en) 2001-07-31

Family

ID=3779192

Family Applications (1)

Application Number Title Priority Date Filing Date
MYPI95000673A MY112587A (en) 1994-03-21 1995-03-17 High impedance power supply

Country Status (6)

Country Link
AU (1) AUPM457794A0 (en)
DE (1) DE19510279A1 (en)
FR (1) FR2718260B1 (en)
GB (1) GB2287805B (en)
HK (1) HK1010463A1 (en)
MY (1) MY112587A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10050708C1 (en) 2000-10-13 2002-05-16 Infineon Technologies Ag Integrated current supply circuit has compensation capacitor and current reflector circuit for compensating parasitic capcitances
FR2864379B1 (en) * 2003-12-23 2009-01-23 Valeo Securite Habitacle WIRE CONNECTION DEVICE WITH REMOTE ELECTRONIC PLATE
US11106233B1 (en) * 2020-01-28 2021-08-31 Analog Devices, Inc. Current mirror arrangements with reduced input impedance

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3843933A (en) * 1973-04-06 1974-10-22 Rca Corp Current amplifier
US4237414A (en) * 1978-12-08 1980-12-02 Motorola, Inc. High impedance output current source
US4808909A (en) * 1987-10-15 1989-02-28 Apex Microtechnology Corporation Bias voltage and constant current supply circuit
EP0517321B1 (en) * 1991-06-06 1999-10-06 Koninklijke Philips Electronics N.V. Telecommunication system comprising a supply circuit for a telecommunication line, and a supply circuit for a telecommunication line suitable for use in the telecommunication system
JPH05315852A (en) * 1992-05-12 1993-11-26 Fuji Electric Co Ltd Current limit circuit and constant voltage source for the same

Also Published As

Publication number Publication date
AUPM457794A0 (en) 1994-04-14
DE19510279A1 (en) 1995-09-28
GB9505621D0 (en) 1995-05-10
FR2718260B1 (en) 1999-04-16
HK1010463A1 (en) 1999-06-17
GB2287805A (en) 1995-09-27
GB2287805B (en) 1998-04-15
FR2718260A1 (en) 1995-10-06

Similar Documents

Publication Publication Date Title
FR2658968B1 (en) PROTECTION DEVICE AGAINST INTERFERENCE GENERATED BY CONNECTION TO A CONTINUOUS POWER SUPPLY SOURCE OR DISCONNECTION OF THIS SOURCE FROM AN ELECTRONIC ASSEMBLY, TO THE SUPPLY DELIVERED BY THIS SOURCE.
TW357477B (en) A low-drop-out voltage regulator with PMOS pass element
TW366618B (en) An electronic trip device comprising a power supply device
AU2001270290A1 (en) Bis circuit for establishing a plurality of bias voltages
WO1996012347A3 (en) A protected switch
DE69821182D1 (en) Power supply control system
UA39185C2 (en) Circuit for surge and overload current protection, in particular for telecommunication installations
CA2279072A1 (en) Onhook telecom power supply regulator mode
MY112587A (en) High impedance power supply
JPS568956A (en) Three-terminal electric power source circuit for telephone set
ATE110907T1 (en) SUBSCRIPTION INTERFACE CIRCUIT WITH ACTIVE A AND B ADER SUPPLY EQUIPMENT.
NO167178C (en) CONNECTOR FOR ELECTRIC POWER SUPPLY TO FUNCTIONAL DEVICES IN A TELEPHONE STATION.
SE9700797L (en) Electrical circuit and procedure
ATE50103T1 (en) LINE CIRCUIT FOR LOOP POWER SUPPLY ON A TWO-WIRE TELEPHONE SUBSCRIBER LINE.
FI941790A0 (en) Method for reducing the power consumption of an electrical device with a voltage regulator, and a voltage regulator-equipped electrical device that saves electric power
MY108665A (en) Control system including a switching circuit for ensuring proper operation when operating power is removed from a portion of the control system.
ES2100812A1 (en) Induction heating system
JPS55154866A (en) Current supply circuit for telephone switchboard
EP0372616B1 (en) Electronic telephone set
ES454612A1 (en) Fault current protection switch
WO2003090355A3 (en) Integrated circuit with clock signal duty cycle control
WO1999026348A3 (en) Subscriber line interface circuit
KR20000019524A (en) Portable terminal equipment for low power
JPS53100708A (en) Current supply circuit
JPS5686679A (en) Direct current arc welding machine