Power supply transformer for telephone

Details Power supply transformer for telephone Power supply transformer for telephone

2000-01-28

2003-02-11

Friedhofer, Michael (Department: 2832)

Inductor devices

With supporting and/or spacing means between coil and core

Preformed insulation between coil and core

C336S065000, C336S170000, C336S180000, C336S208000

Reexamination Certificate

active

06518869

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power supply transformer for a telephone to be incorporated in an AC adapter as a power supply for the telephone.
2. Description of the Prior Art
FIG. 3
is a block diagram showing a configuration of a power supply system related to a telephone set using a power supply transformer for a telephone according to a conventional example. In the drawings, an AC adapter
21
, is configured by a power supply transformer
22
and a rectifying portion
23
, etc., and converts a commercial power supply (AC120V60 Hz) which is an input into a predetermined DC voltage to be outputted.
In a charging stand
25
, there are installed a stabilizing power supply
27
, which stabilizes a DC output from the AC adapter
21
to implement outputting to a charging terminals
25
a
, and a modem
16
of the telephone set, which receives a power supply from this stabilizing power supply
27
, or the like. In an extension phone of the telephone set, etc., which is displaced on the charging stand
25
, a built-in battery is charged with charging currents from the charging terminals
25
a.
The modem
16
implements modulation-demodulation between a telephone line
10
and the telephone set for DC voltages of 75 to 200 V via a line transformer
28
.
Thus, insulation (for the telephone set) is implemented by using separate transformers respectively for a commercial power supply line (AC 120 V in 60 Hz) and the telephone line
10
.
However, safety standards on electric insulation were intensified so as to give rise to a necessity that the sufficient insulation distance between a primary side and a secondary side should be also secured as to the line transformer
28
inserted between the telephone line
10
and the modem
16
.
BRIEF SUMMARY OF THE INVENTION
Object of the Invention
Contemplating on such points, the present invention is accomplished, and the purpose of the present invention is to provide a new power supply transformer for telephone in order to realize good cost performance while complying with the standards of the power supply system related to the telephone set caused by strengthening the safety standards.
SUMMARY OF THE INVENTION
It is also one of measures for the safety standards to improve the line transformer
28
inserted between the telephone line
10
and the modem
16
to secure insulation distance on insulation between a primary side and a secondary side. However, according to the present application, the power supply transformer for telephone is configured by respectively independent two secondary side circuits, and one is used for charging as in a conventional one and the other is used for power supply to the modem
16
. This enables the telephone line
10
to directly connect with the modem
16
by omitting the line transformer
28
.


REFERENCES:
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patent: 4611097 (1986-09-01), Grimes
patent: 4912447 (1990-03-01), Paul
patent: 5534839 (1996-07-01), Mackin et al.
patent: 5805431 (1998-09-01), Joshi et al.
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patent: 06303185 (1994-10-01), None
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