JPS63206060A - Incoming trunk connection circuit - Google Patents

Abstract

PURPOSE:To decrease the power consumption in the circuit by forming an incoming trunk connection circuit by a DC voltage supply circuit whose output voltage is reduced when a current increases and an AC current control circuit. CONSTITUTION:The current of a voice signal is controlled so as not to be given to an incoming trunk connection circuit by AC current block means 10, 11. On the other hand, as to the DC current, the output voltage of a DC voltage supply means 13 is set to a value equal but in opposite polarity to the power supply in an incoming trunk of an exchange. Thus, the power supply in the incoming trunk and the output voltage of the DC voltage supply means 13 are cancelled together, and only the output voltage of the DC voltage supply means 12 exists in the incoming trunk connection circuit. Since the output voltage of the DC voltage supply means 12 is decreased as the current increases, the power consumption represented by a product of a potential difference across the AC current blocking means 10, 11 and the flowing current is reduced.

Description

[Detailed Description of the Invention] [Summary] An incoming trunk of an exchange using a loop signaling system (Inco
n+ing) rank, hereinafter referred to as I10 trunk)
In the circuit that connects to and transfers the signaling signal from the carrier end station equipment to the above-mentioned exchange, a voltage decay type and constant voltage type DC/DC converter, a transistor and an AC current control circuit are connected to ■/C trunk connection. By forming the circuit, the power consumption in the circuit is reduced.

[Industrial application field]

The present invention relates to an improvement of an I10 trunk connection circuit installed in a carrier terminal equipment.

1/C) In order to be able to mount the rank connection circuits at a higher density, it is desirable that the circuits consume less power and have less restriction on the mounting capacity due to heat generation.

[Conventional technology]

FIG. 4 is a l10) rank connection circuit diagram of a conventional example.

FIG. 5 is a block diagram showing the configuration of an example PCM multiplexed carrier communication system.

In FIG. 5, it is assumed that a signaling signal such as a dialing signal or a voice signal for making a call is sent from the calling party's telephone to the called party's telephone. This signaling signal etc. is transmitted to the analog exchange 5 via the transmission line.
is transferred to the outgoing trunk (Out
going Trunks (hereinafter referred to as 0/G trunks) to the carrier end station bag y1 via transmission lines (a line and b line)
Transferred to 6.

The signal is PCM-multiplexed together with signaling signals from other channels in the carrier terminal device 6, and transferred to the carrier terminal device 7 on the called party side via a transmission line.

In this carrier terminal equipment 7, the PCM multiplexed carrier signal is demultiplexed, and the corresponding transmission line (a
line and b line) to the l10) rank in the analog exchange 8, and from the l10) rank to the called party's telephone via the transmission line.

In FIG. 5, the portion corresponding to the l/C trunk connection circuit is shown surrounded by a dotted line.

FIG. 4 shows the I10 trunk circuit diagram, and the DC constant current control circuit 2 is a circuit that controls the peak DC current value of the pulse of the signaling signal flowing through the npn transistor 1 to be constant. On the other hand, the alternating current control circuit 3 is constructed by, for example, connecting a capacitor C shown by a dotted line between the base and emitter of the npn transistor 1 shown in the figure.
This is a circuit that controls the voice signal current sent to the /C trunk connection circuit from flowing into the circuit and transfers it to the corresponding circuit (not shown) in the analog exchange.

Further, the resistor R inserted in the a line and the b line indicates a DC resistance component of an inductance (not shown) for blocking the above-mentioned audio signal current on the rank side.

In addition, a′f! The reason why the resistor R is inserted into both the a and b lines is to maintain balance with respect to the ground and reduce distortion in the waveform of the signaling signal.

Now, when a signaling signal consisting of "1" and "O" from the calling party is transferred to the I/Cl-rank connection circuit, a drive circuit (not shown) that drives switch 4 converts this signaling signal into Switch 4 is turned on/off accordingly. As a result, the pulse current (peak value is Idc) flows from the ground of the B line to the station power supply (in this case -5
0v). The signaling signal is then transferred from a corresponding circuit (not shown) in the analog exchange 8 to the telephone of the called party.

In this way, signaling signals and the like were transferred.

[Problem that the invention seeks to solve]

However, in the above-mentioned I/C1-rank connection circuit, the power consumption in this circuit, that is, the power consumption Pc in the transistor 1 (npn), is determined by Pc = (station power supply - 21dc - R) · Idc. For example, station power supply (absolute value) -50V, R
-200Ω, Idc=30mA, Pc -(50
2Xo, 03X200) Xo, 03~1.2 Wat
It becomes t.

As a result, when the load R in the I/C1-rank is small, there is a problem in that the power consumed increases in proportion to the flowing current value.

[Means for solving problems]

The above-mentioned problem is solved as shown in FIG. 1, in the circuit connected to the incoming trunk of the exchange, an alternating current blocking means 10 is connected to the two outputs of the incoming trunk, and passes the direct current and blocks the voice signal current. and 11, and a DC voltage supply means 12, which is connected to the other output of the AC current blocking means 10 and has a characteristic that the output DC voltage decreases as the current increases, and the other output of the AC current blocking means (11). DC voltage supply means 13 that is connected and outputs a predetermined DC voltage.
This problem is solved by the incoming trunk connection circuit of the present invention, in which the other outputs of the DC voltage supply means 12 and 13 are connected.

[Effect]

In FIG. 1, the current of the audio signal is
0 and 11, it is controlled so that it does not flow to the incoming trunk connection circuit.

On the other hand, regarding the DC current, the output voltage of the DC voltage supply means 13 is set to a value equal to and opposite in polarity to the power supply in the trunk of the exchange. Therefore, the power supply in the passenger trunk and the output voltage of the DC voltage supply means 13 cancel each other out, and only the output voltage of the DC voltage supply means 12 is present in the incoming trunk connection circuit.

Since this DC voltage supply means 12 has a characteristic that its output voltage decreases as the current increases, the power consumption is expressed as the product of the potential difference across each of the AC current blocking means 10 and 11 and the flowing current. That is, the power consumption in the large trunk connection circuit can be reduced.

〔Example〕

FIG. 2 is a 1/C trunk connection circuit diagram of an embodiment of the present invention.

Figure 3 shows the voltage back type DC/D used in the example.
It is a characteristic diagram of a C converter.

In FIG. 2, the AC current control circuit 14
) transistor 100 and npn transistor 11
Control is performed so that no alternating current (in this case, an audio signal) flows between the collector and emitter of 0.

Next, the constant voltage type DC/DC converter 130 is connected to the I/C
Set it to have the same voltage with the opposite polarity as the trunk power supply (-50V in this case), and set the voltage reverse type DC/DC converter 120 to have the same polarity as the I/C rank power supply. As shown in FIG. 3, the undervoltage type DC/DC converter 120 has a characteristic that as the current increases, the output voltage decreases.

Further, as in the conventional example, the switch 15 is turned on/off via a drive circuit (not shown) in response to a sider ring signal transferred to the /c trunk connection circuit.

The peak value 1dc of the pulse current flowing through the l10) rank connection circuit shown in Figure 2 is: Idc = (absolute value of C station power supply) -2R - Idc2Vc
e Output voltage of constant voltage type DC/DC converter 130 + output voltage of voltage back type converter 120)/(2R)
■ Represented by.

(However, Vce is pnps and npn)
The emitter-collector voltage is 00.110, and the values are assumed to be equal to each other. ) As a result, l10) pnp and np of rank connection circuit
n) The power Pc consumed in the transistors 100 and 110 and the voltage undervoltage type and constant voltage type DC/DC converters 120 and 130 is Pcm(dc・2Vce, constant voltage type and voltage undervoltage type DC/DC converter) The power consumption of the DC converter is ■.

Now, the absolute value of the station power supply = 50V, R = 200Ω, Idc =
30mA, Vce=3V, constant voltage type and voltage back type D
Power consumption of C/DC converter 130.120 = 0,
I Watt, constant voltage type DC/DC converter 1
Output voltage of 30 = 50■, when 30mA flows through the voltage reverse type DC/DC converter 120, the output voltage is 18
Suppose that these values are set to be
, and by substituting it into equation 0, Pc = ((502・200 −0.03−2 ・3
-50+18) / (2・200) ) ・2・3
+0.1X2 -0.2 Watt.

As a result, the power consumption, which was 1.2 Watt in the conventional example, can be reduced to 0.2 Watt.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to significantly reduce the power consumption in l10) rank connection circuits, alleviate the restrictions on the mounting capacity of circuits due to heat generation, and enable high-density mounting.

[Brief explanation of the drawing]

Figure 1 is a principle diagram of the present invention, Figure 2 is an embodiment of the present invention l10) Rank connection D C/
A characteristic diagram of a DC converter, FIG. 4 is a conventional I10 trunk connection circuit diagram, and FIG. 5 is a block diagram showing the configuration of an example of a PCM multiplexed carrier communication system. In the figure, 10.11 indicates an alternating current blocking means, and 12.13 indicates a direct current voltage supply means. Original fri diagram of the present invention No. 1 (!1 0mA i ￥ 3 diagram

Claims (1)

[Scope of Claims] In a circuit connected to an incoming trunk of an exchange, an alternating current blocking means (10) is connected to two outputs of the incoming trunk and passes a direct current and blocks a voice signal current.
, and (11), connected to the other output of the alternating current blocking means (10),
A DC voltage supply means (12) having a characteristic that the output DC voltage decreases as the current increases, and the AC current blocking means (
11), and a DC voltage supply means (13) that outputs a predetermined DC voltage, and the other outputs of the DC voltage supply means (12) and (13) are connected. An incoming trunk connection circuit characterized by: