IT1252533B - Circuit device for energising a subscriber telephone circuit during low voltage "loss" - Google Patents

Circuit device for energising a subscriber telephone circuit during low voltage "loss"

Info

Publication number
IT1252533B
IT1252533B ITMI913376A ITMI913376A IT1252533B IT 1252533 B IT1252533 B IT 1252533B IT MI913376 A ITMI913376 A IT MI913376A IT MI913376 A ITMI913376 A IT MI913376A IT 1252533 B IT1252533 B IT 1252533B
Authority
IT
Italy
Prior art keywords
transistor
circuit
loss
bipolar transistor
energising
Prior art date
Application number
ITMI913376A
Other languages
Italian (it)
Inventor
Luciano Tomasini
Rinaldo Castello
Original Assignee
St Microelectronics Srl
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 St Microelectronics Srl filed Critical St Microelectronics Srl
Priority to ITMI913376A priority Critical patent/IT1252533B/en
Publication of ITMI913376A0 publication Critical patent/ITMI913376A0/en
Priority to EP92115759A priority patent/EP0547301B1/en
Priority to DE69224467T priority patent/DE69224467T2/en
Priority to JP4270135A priority patent/JPH05252320A/en
Priority to US07/991,564 priority patent/US5337355A/en
Publication of ITMI913376A1 publication Critical patent/ITMI913376A1/en
Application granted granted Critical
Publication of IT1252533B publication Critical patent/IT1252533B/en

Links

Classifications

    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Landscapes

  • Amplifiers (AREA)

Abstract

A circuit is described which comprises an operational amplifier A, two resistors R1, R2, connected between the telephone line L and the inputs of the amplifier, a capacitor C, which is charged by a first bipolar transistor P1 controlled by the amplifier via a first FET transistor M1, a second bipolar transistor P2 arranged in parallel with the connection of the first transistor P1 and the capacitor C, a second FET transistor M2, equal to the first and with "source" and "gate" terminals connected to the corresponding terminals of the first one, and two current generators CC1, CC2, connected to the "drain" terminals, respectively, of the first and the second FET transistor and to the bases, respectively, of the first and the second bipolar transistor P1, P2. The currents I1, I2 of the two generators and the other parameters of the circuit are such as to keep the first and the second bipolar transistor respectively conducting and inhibited, except in the case when the line voltage drops below a minimum predetermined value: in such case, the first and the second transistor respectively switch to inhibition and conduction. The circuit has a lower "voltage loss" than the known circuits. <IMAGE>
ITMI913376A 1991-12-17 1991-12-17 Circuit device for energising a subscriber telephone circuit during low voltage "loss" IT1252533B (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
ITMI913376A IT1252533B (en) 1991-12-17 1991-12-17 Circuit device for energising a subscriber telephone circuit during low voltage "loss"
EP92115759A EP0547301B1 (en) 1991-12-17 1992-09-15 Low-loss power feeding circuit for telephone apparatus
DE69224467T DE69224467T2 (en) 1991-12-17 1992-09-15 Power supply circuit for telephony with low power loss
JP4270135A JPH05252320A (en) 1991-12-17 1992-10-08 Small-voltage-loss voltage supply circuit array for telephone line
US07/991,564 US5337355A (en) 1991-12-17 1992-12-16 Supply circuit device for a user's telephone circuit, having a low voltage loss

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI913376A IT1252533B (en) 1991-12-17 1991-12-17 Circuit device for energising a subscriber telephone circuit during low voltage "loss"

Publications (3)

Publication Number Publication Date
ITMI913376A0 ITMI913376A0 (en) 1991-12-17
ITMI913376A1 ITMI913376A1 (en) 1993-06-17
IT1252533B true IT1252533B (en) 1995-06-19

Family

ID=11361351

Family Applications (1)

Application Number Title Priority Date Filing Date
ITMI913376A IT1252533B (en) 1991-12-17 1991-12-17 Circuit device for energising a subscriber telephone circuit during low voltage "loss"

Country Status (2)

Country Link
DE (1) DE69224467T2 (en)
IT (1) IT1252533B (en)

Also Published As

Publication number Publication date
DE69224467D1 (en) 1998-03-26
DE69224467T2 (en) 1998-06-10
ITMI913376A1 (en) 1993-06-17
ITMI913376A0 (en) 1991-12-17

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Legal Events

Date Code Title Description
0001 Granted
TA Fee payment date (situation as of event date), data collected since 19931001

Effective date: 19961227