JPS60261287A - Subscriber's circuit constituting system - Google Patents

Abstract

PURPOSE:To reduce the voltage of circuit elements to make a device small-sized by constituting a feedback circuit, which determines the DC feed characteristic and the AC terminal characteristic of a subscriber's circuit, with a low voltage level circuit. CONSTITUTION:A high voltage level circuit connected directly to a subscriber's line and the low voltage level circuit as the feedback circuit of the high voltage level circuit are shown in the left and the right with respect to a line AA' in the figure. In such a high voltage level circuit, voltage and current states of the subscriber's line are detected by a means 3' and are converted to a low voltage level by a means 7. The low voltage level circuit is provided with a signal transmitting circuit 4' for DC feedback having a transfer ratio GDC. A signal transmitting circuit 5' for AC feedback having a transfer ratio GAC, and a DC power source 6', and DC and AC of the low voltage level are converted to a high voltage level by a means 8. The low voltage level circuit determines the DC feed characteristic and the AC terminal characteristic of the electronic subscriber's circuit by its feedback characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a system for configuring a subscriber circuit for a telephone exchange.

[Background of the invention]

In conventional subscriber circuits, the return R circuit that determines the DC supply characteristics and AC termination characteristics was constructed from the part to which high voltage is applied, so one circuit element was fi! JIt pressure iC, the shape is large and expensive, and it is difficult to perform variable control of characteristics. This will be explained using a diagram. FIG. 1 is a block diagram 191I of a conventional method of configuring a subscriber circuit. 1st
In the figure, 1 is the load resistance of the subscriber, 2 is the voltage * R conversion circuit (conversion ratio ym), and ss is the voltage detection circuit (detection ratio k).
, 4 is a signal transmission circuit for DC feedback l\5 (transmission ratio Gnc),
” is the signal transmission circuit for father discharge arrest (transmission ratio Gic), 6
is the required condenser.

In FIG. 1, the equal measurement current resistance zDc and the equivalent AC resistance ZAc of the subscriber circuit are expressed by the following equations based on the conditions of the feedback circuit.

ZJ) c= 1/(K-Gnc"!InL)...■
”' = '/CK - Gic ・gtn) ,,,
(2) Therefore, the feedback characteristic can be determined by GDc or 'JIC.

Next, as a second factor, one of the methods of configuring a conventional subscriber circuit will be described. In Figure 2, 1o1 is the load resistance of the subscriber line, 1
02 and 105 are current supply resistors, 104 and 105 are current supply transistors, and 106.

107, 125 are operational amplifiers, ios~+11.12
o.

121 is a resistor, 112 to 118 are current mirror circuits that produce one force at a ratio of one foot to the human force indicated by a circle, 119
, 124 is a transistor, 122 is a capacitor for removing the pass current, 125 is a DC bias current source, 126 is a capacitor for DC bias, 127 is an AC impedance circuit, 128 is a low torque voltage, % 129 is ^ It is a voltage power supply.

In the second case, the equivalent positional flow resistance ZDc and the equivalent flow resistance ZAc are expressed as R1°, n.
・・■ R,, = Rlo, = R,2/? 1□o=R,1
= R, R1゜2 = R, o, =&.

~ζ &)c: 2n・-/n...■ Zic = 2L "Bottle" Rc/Ra -0 As an example, Ri = 40kQ Rn = 9.27 to GBc
= s,”o R,.

= 13.3A: Ω.

zl)c=440(Ω)...■ Zic = 2. Ro0...■ If you compare it with Figure 1, it looks like the gray type.

G, c== 1...@ G, C==5 10.0 w, In Figure 2, the current mirror circuits 115 to 118, the transistor 124, and the capacitor 122, which are the circuits in which GBc and Gic rotate next, are ``''- All circuits to which high pressure levels are applied must be connected to IK.

Due to its large size and pressure resistance, it was disadvantageous in terms of cost as well. I added a circuit to change the 1% property.
Even when doing so, a pressure-resistant cable was required, which could not be easily realized.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to simplify the voltage level circuit of a subscriber circuit and to provide a subscriber circuit configuration system that is inexpensive and can easily be replaced by a 1% controller.

[Summary of the invention]

The present invention provides direct fire supply t! of subscriber circuits. P! The feedback circuit that determines the f-characteristics and the flow path end characteristics is entirely composed of low voltage level circuits.

[Examples of the invention]

Hereinafter, the bond aVc of the present invention will be explained using factors. FIG. 3 is a ten-step diagram of the subscriber circuit configuration method according to the present invention. In Figure m13, the same parts as in Figure 1 are marked with a 4- symbol, 2' to 6' are circuits that realize the same function, but the voltage conditions are different, and 7.8 is the voltage This is a level conversion circuit. In line with FIG. 6, it is possible to construct the entire area to the right of the point AA' divided by the voltage level converting circuits 7 and 8 with low voltage level circuits.

Figure 4 shows the first embodiment of the present invention. The same parts as in Figure 2 are given the same reference numerals. 17 and 112' change the input/output direction of the current mirror, and 1113' shows the current mirror ratio. Change to 10=1, and 120' is the resistance 111. K is changed, and the withstand voltage conditions of the current mirror circuits 115' to IIS', the transistor 124', and the capacitor 122' are relaxed. #, Anti-121' is the duty. [Change.

The capacitor 122' is 10 times the value, 13o is a current mirror circuit, and 131 is a low voltage circuit. The DC equivalent resistance /Do and current equivalent resistance ZAc in FIG. 4 are exactly the same as the values determined in FIG. 2. All of the circuits 1111 to the right of AA' can be configured with low voltage level circuits. Also, by lowering the resistance of -R12o' and R,,,,', it is possible to prevent the dynaoc range from running out.

Next, FIG. 5 shows a second embodiment of the present invention.

In the brown 5 diagram, what is the symbol for the part 1 in Figure 2 or M4? 162 to 166 are current mirror circuits, Ii and 138 are '11 flow cage pressure conversion resistors L59.
, 140 is a voltage-current conversion resistor, 141° and 142 are analog-to-digital conversion (hereinafter referred to as A/D conversion) circuits, and 143 and 144 are digital-to-analog conversion (〃/
It is abbreviated as A conversion. ) circuit, 145 is tintal operation @J#
& is. The characteristics shown in Fig. 5 are A11) Conversion circuit 1
41 and 142, and the output 'm+r' of the D/A conversion circuits 145 and 144.

For example, the conditions to obtain the same characteristics as in Section 2 and Figure 4 are R,, == R1,, == R,,. = RI4
0, the DC component to the draft is expressed by the subscript l) c, and the exchange meeting is expressed by the subscript flAC.

Vs, tc = V4Ac = (Vsic +Vxic
) - Ni! −.

By multiplying the 0 formula and the 0 formula by a percentage, it is easy to proportionally change the If current equivalent resistance and the 11fll resistance such as the current.

or.

The resistance is 1100. It is also possible to separately set the isometric stationary current resistance on the ground side to 3500, which is 1.5 times the conventional value.

With the above explanation? Although I said that the X-nose was treated with digital processing, there is no need to say that analog processing is also possible.

It is also clear that the present invention can be applied to trunk circuits having the same functions as single-person circuits.

[Efficacy of invention]

According to the present invention, it is possible to realize a low-cost subscriber circuit by simplifying the high-voltage level circuit of the calorie input-saving circuit, and the circuit for making the 1% property variable can also be configured with a low-voltage level circuit. . Furthermore, by using digital processing, there is an effect that variable decoration of characteristics can be made even more easily.

[Brief explanation of drawings]

1C is block C of the conventional method for configuring 8 subscriber circuits, FIG. 2 is a circuit diagram showing an example of a conventional method for configuring a subscriber circuit, and 3rd figure in brown is a method for configuring a subscriber circuit according to the present invention. FIG. 4 is a circuit diagram showing a first embodiment of the present invention, and FIG. 5 is a circuit diagram showing an embodiment of the helmet 2 according to the present invention. 1...Load resistance for addition/reduction, 2...Voltage/current conversion circuit 6...'torque pressure output circuit 4...No. 1a transmission circuit for DC feedback 5...AC signal transmission circuit 6゛...l! Sink and protective capacitor 101...Load resistance io2 of addition '4#. io5...Resistor for current supply i04,105...Transistor for current supply 106.
107,123... operational amplifier 108~111.12
0,121 Resistors 112 to 118...Current mirror circuit 119.124...Transistor 122...Capacitor for current removal 125...11L flow resistance for DC bias 126...m
Rsha11. LT capacitor 12...Current impedance circuit 128...Low tolerance voltage monument 129...High voltage IIL source 160...Current mirror circuit 161...Low voltage power supply 152-136...Current mirror circuit 137,13
8... Resistor for current/voltage variation 169.140... Voltage/current conversion resistor 141.142 A/D conversion circuit 143.144... D/A conversion circuit 145... Digital calculation circuit agent Patent Attorney Sho Mk Yuguruma 1 Zusui 2 Figure 3

Claims (1)

[Scope of Claims] (1) Means for transmitting and receiving AC signals between the terminal and the means for supplying DC current to the terminal via the subscriber route.
The electronic subscriber circuit has a high voltage level circuit directly connected to the subscriber line, and a low voltage level circuit which is a feedback circuit of the high voltage level circuit, and the high voltage level circuit is connected to the subscriber line. It has the function of detecting the state of high voltage and converting it to a low voltage level, and the function of converting the low voltage level of direct current and alternating current to the tin cage pressure level to drive the subscriber line, and the low voltage A subscriber circuit configuration system characterized in that the level circuit has feedback characteristics that determine the DC supply characteristics and AC termination characteristics of the electronic subscriber circuit. (2) The high voltage level circuit transmits separate voltage and current signals for both sides of the subscriber line to the low voltage level circuit, and also transmits separate drive signals for both sides from the low voltage level circuit to the subscriber line. 2. The subscriber circuit configuration system according to claim 1, wherein the low voltage level circuit has a transmitting function, and the low voltage level circuit has both arms. (6) Analog on the input side of the low voltage level circuit. By providing a digital transformation circuit and a digital and analog transformation circuit on the output side. A subscriber circuit configuration system according to claim 1 or claim 2, wherein the feedback characteristic can be calculated or controlled by a digital signal.