SU1406819A2 - Device for power supply of telephone signal - Google Patents

Abstract

This invention relates to the field of telephony. The purpose of the invention is to reduce the average power consumption by disconnecting the direct current circuits when the telephone line is open. The device contains a stationary power supply 1, a controlled current regulator (MCI) 2, a matching unit 3, an uncontrolled current stabilizer (ICT) 4, a telephone line 5, voltage dividers 6, 7. To achieve the goal in the device control elements 9, 11 and executive elements 8, 10 are introduced. The current value stabilized by the UTS 2, with the zero output of the matching unit 3, must be greater than the current of the telephone line stabilized by the HOT 4. Any change in the output voltage of the station source 1 power is distributed between TSI 2 and IST 4. The device provides the symmetry of the conversational path when the external conditions change and does not consume current in the absence of a call to the subscriber. 2 Il. with S (L with

Description

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 The invention relates to a telephone communication technique and is an improvement of the invention according to the author. No. 1185645.

The purpose of the invention is to reduce the average power consumption by disconnecting the direct current circuits when the telephone line is open. ; Figure 1 shows a structural Electric; 1 diagram of the device power-telephone lines; 2, fro, however, an exemplary embodiment. The telephone power supply unit contains a station power supply 1, a controlled current regulator, a matching unit 3, an uncontrolled, 1 current stabilizer 4, a telephone line 5, the first 6 and the second 7 voltage switches, the first performer | 1st element 8, first control element 9, second control element | iHT 10 and second control element

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I In Fig. 2, the light diodes 12 and 13, the phototransistors 14 and 15, the capacitors 16 and 17, the optical connections 18 and 19, the transistor 20, the second 21, and the first 22 inputs of the matching unit are indicated. and a control input 23 of a controllable |; current stabilizer 2. The power supply unit of telephone lines works as follows. ; With the open loop of telephone line 11 5 (no call from the subscriber's side) through the controlled current stabilizer 2, the uncontrolled steamer 4 current and the control elements 9 and 11 do not flow. Sigils 1 and 12 and 13 do not radiate, and the photo-effects 14 and 15 are closed. Capacitors 16 and 17 prevent the flow of direct current through voltage dividers 6 and 7. Thus, the current from station source 1 is not consumed.

When the loop of the telephone line 5 (subscriber is picked up) is closed in the controlled stabilizer circuit. 2 current and uncontrolled current stabilizer 4 current is flowing, LEDs 12 and 13 begin to radiate under the influence of toporo, while opening phototransistors 14 and 15 by means of appropriate optical connections 18 and 19 and open phototransistors 14 and 15 respectively bypassing the capacitor 16 and 17, and a constant current flows through the dividers 6 and 7 of the voltage.

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causing the occurrence of the corresponding potentials at the inputs 21 and 22 of the matching unit 3. In accordance with the changes of these potentials, the voltage value at the control input 23 of the controlled stabilizer changes

2 currents, providing regulation of the current in the loop of the telephone line 5. In this case, the symmetry of the conversational path of the telephone line 5 is provided as follows. Current value stabilized by controlled current stabilizer 2, with zero output signal of matching unit

3 should be greater than the current of the telephone line stabilized by the uncontrolled stabilizer 4 current. With equal voltages on the controllable

and uncontrolled current stabilizers are equal and their differential resistances, since the same current flows through both stabilizers 2 and 4. Since at a constant resistance of the telephone line 5 at a given current, the voltage at its input is constant, any change in the output voltage of the station source of power 1 is distributed between the current stabilizers 2 and 4. This is achieved as follows. For example, increasing the output voltage of a station power supply 1 increases both the voltage on the lower arm of the voltage divider 7 connected to the station power supply 1 and the voltage on the lower shoulder of the voltage divider -6 connected to the telephone line 5 , invariably, as the resistance of the telephone line 5 and the current flowing through it are constant. This increases the voltage at the input 21 of the matching unit 3, which leads to an increase in the signal at the control output of the matching unit 3 (according to FIG. 2, the collector current of the transistor 20 increases), which, in turn, increases the voltage on the current regulator 2. Thus, the output voltage of the power source 1 is increased. are distributed between current stabilizers 2 and 4. These voltages are distributed evenly with an appropriate selection of the transfer ratios of voltage dividers 6 and 7.

Similarly, the power supply system for telephone lines also works when changing the length of the telephone line 5, times314

parameters of semiconductor elements, change in ambient temperature.

Thus, the telephone line power device ensures the symmetry of the spoken path when the external conditions change and does not consume current in the absence of a call to the subscriber.

Claims (1)

Invention Formula The device of power supply of telephone lines on aut.St. No. 1185645, characterized in that, in order to reduce the average power consumption by disconnecting the DC circuits when the telephone line is open, the first control element and the first executive element, in series, are introduced into it 94 the second control element and the second actuator are connected, the first and second terminals of the first voltage divider are connected respectively to the first input of the first control element, the second input of which is an input for connecting the first wire of the telephone line, and to the power input of the first an actuator whose output is connected to the first input of the second control element, the second input of which is an input for connecting the second telephone line, and to the second output of the uncontrolled stub a current selector, to the first output of which the output of the second actuator is connected, to the power input of which the second output of the second voltage divider is connected,