JPS63127651A - Talking current distributed supply system - Google Patents

Abstract

PURPOSE:To suppress the temperature rise in the inside of an electronic exchange by providing a talking power supply circuit to a subscriber terminal side having an independent power supply in its inside connected to a subscriber circuit of an exchange. CONSTITUTION:The talking current supply circuit 3 is provided to plural subscriber terminal sets 1, 1a-1c...1l-1n connected to a subscriber circuit 2 of an exchange 6 and having an independent power supply 5 in its inside. Then a talking current is supplied from the talking current supply circuit 3 to arrange distributedly talking current supply sources 5, 5a-5c...5l-5n. The talking current supply circuit 3 has a high AC impedance, receives power supply from the independent power supply 5 of the subscriber terminal equipment and supplies a talking current to a DC hold circuit 4 in the subscriber circuit 2 of an exchange 2. Since no talking current is supplied from the power supply of the exchange 6, the temperature rise of the exchange due to heat of the talking current supply is not caused. Moreover, the talking current is required for its own terminal set only at each subscriber terminal set, then the heat from it is less.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a communication current supply system suitable for connecting a subscriber circuit of an electronic exchange and a subscriber terminal, when the subscriber terminal has an independent power supply.

(Prior Art) Conventionally, the communication current supplied to the subscriber circuit of an electronic exchange and a circuit consisting of subscriber terminals is supplied from the subscriber circuit side of the exchange, as shown in FIGS. 8 and 4. A method is being adopted.

In FIG. 3, the telephone current supply circuit 13 is the subscriber circuit 12.
Niasa, its power source is the power source 15 of the electronic exchange 1G in Figure 4.
I'm getting it from The subscriber terminals 11 (11a, 11b, 11C9...111,
11m, 11n) are all transferred from the communication current supply circuit 13 in the subscriber circuit 12 of the exchange 16 to the subscriber terminal 1.
1 DC holding circuit.

In addition, TIIIITII is a hybrid transformer, CI□
.

C11 is a DC blocking capacitor.

(Problems to be Solved by the Invention) In the conventional communication current supply method described above, communication current is supplied to all subscriber terminals from the communication current supply circuit in the subscriber circuit of the electronic exchange. , as shown in Figure 4, call 1! Since the power supply for supplying the current is concentrated in one place (the exchange), it is difficult to dissipate heat, and there is a problem that the temperature inside the exchange increases. In Figure 4, exchange 1G
The diagonal line indicates that the heat dissipation is large.

An object of the present invention is to solve such problems by distributing the power supply for the call current to the subscriber terminals and supplying the call current from the subscriber terminals to the exchange, thereby reducing the temperature rise inside the exchange. 1 call that you can make fewer calls! The object of the present invention is to provide a flow-distributed supply system.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the speech current distributed supply system according to the present invention uses a plurality of internally independent power supplies 5 connected to the subscriber circuit 2 of the exchange 6. Subscriber terminal 11at
lb, 1c, ezll.

1m, In, a communication current supply circuit 3 is provided, and communication current is supplied from the communication current supply circuit 3, thereby forming communication current supply sources 5ISaTSb, 5el...S l + S m
+5n distributed power distribution system.

(Example) Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a circuit diagram showing a main part of an embodiment according to the present invention.

FIG. 2 is an explanatory diagram showing the relationship between the supply of communication current and the heat generation of the equipment for the exchange and a plurality of subscriber terminals connected thereto in the embodiment of FIG. 1.

In FIG. 1, subscriber terminal l is a plurality of subscriber terminals 1a, 1b, 1c, +1 connected to exchange 6 in FIG.
It corresponds to one of oll, 1m, ]n, and is located inside the exchange 6 of FIG. 2, which has two subscriber circuits, and corresponds to the subscriber terminal 1.

In addition, the power supply S for the subscriber terminal is the power supply Sa in Fig. 2 *
S b * S c + ... S l + S m
+5 corresponds to one of n.

The communication current supply circuit 3 has high impedance with respect to alternating current, receives power supply from an independent source 5 of the subscriber terminal, and supplies communication current to the DC holding circuit 4 in the subscriber circuit 2 of the exchange 2.

Note that Tl and Tl are hybrid transformers,
C1* C1 is a DC blocking capacitor.

In FIG. 2, each subscriber terminal 1a, lb, IC2...
・1111m and In are each independent power supply 5a + S
b p S c r ...51 r S m r
Can you make calls while getting the necessary power for your device?
1! It also serves as a diverted power supply and is self-sustaining from the power supply of the exchange 6. Since it is not supplied with diverted power, there is no temperature rise due to heat generated by the exchange for supplying communication current as in the conventional case.

On the other hand, in each subscriber terminal, the call current is only that necessary for the own terminal, so the amount of heat generated by this is not small. Even in terms of structure, it is easy to make calls! It is easy to dissipate the heat generated by the flow supply and there is no problem.

In addition, in FIG. 2, each subscriber terminal is shaded to indicate that heat is generated at this location due to the supply of communication current.

(Effects of the Invention) As explained above, the present invention provides a telephone power supply circuit on the subscriber terminal side, thereby dispersing the source of Joule heat generated by the supply of telephone current. It has the effect of suppressing temperature rise.

Therefore, the thermal design of the exchanger is much easier than in the past, and the exchanger can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a main part of an embodiment according to the present invention. FIG. 2 is an explanatory diagram showing the relationship between the supply of communication current and heat generation in the entire system to which the embodiment of FIG. 1 is applied. FIG. 8 is a circuit diagram showing a main part of a conventional communication current supply system. FIG. 4 is an explanatory diagram showing the relationship between the supply of communication current and heat generation in the entire system using the circuit configuration of FIG. 8. 11111b*1e16zll11mllntll i
la+llb+11c, ***111 = l l m
+ 1 I n... Subscriber terminal 2.12.0
...Subscriber circuit of exchange 3.13...Telephone current supply circuit 4.14...-DC holding circuit 5+5at5b, 5c, ***51t5m, 5n...-
-・Independent power supply 6.16・Fist・Exchanger l5・Φ・・Power source of exchanger

Claims (1)

[Claims] A telephone current supply circuit is provided to a plurality of subscriber terminals connected to a subscriber circuit of an exchange and each having an independent power supply inside, and the telephone current supply circuit supplies telephone current from the telephone current supply circuit, thereby providing a telephone current supply source. A distributed call current supply system characterized by distributed distribution.