JPS5864857A - Total heat generation value restricting device - Google Patents

Abstract

PURPOSE:To ensure the stable operation for subscriber circuits in the same unit, through the suppression of heat generation value, by suppressing the number of simultaneous calls a prescribed number or more for a plurality of subscribers in the unit. CONSTITUTION:A plurality of subscriber circuits are loaded in one unit and a subscriber terminal 7 is connected to a power supply 26 via a telephone cable 6, equivalent power feeding resistors 23, 24 and a channel controlling circuit 25. The circuit 25 controls a channel current with a signal from a subscriber circuit controlling circuit 29 receiving the subscriber state signal of a subscriber state monitoring circuit 28. In this case, the controlling circuit 29 discriminates a subscriber state signal and gives a channel current stop signal to the control circuit 25 of subscriber circuits which are not busy, when the simultaneous calls of the subscribers in the same unit is a prescribed criterion or over. Thus, the circuit 25 inhibits the calling of the subscribers except tentative call.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a system for regulating the total heat generation amount in a subscriber circuit that limits simultaneous calls by multiple subscribers housed in the same unit and suppresses the heat generation amount within the unit.

FIG. 1 shows a subscriber circuit of a conventional subscriber exchange. 1st
In the figure, 1 and 2 are subscriber terminal connection terminals, 3 is an equivalent power supply resistance connected between the subscriber terminal connection terminal 1 and the power supply, and 4
is an equivalent power supply resistance connected between the subscriber terminal connection terminal 2 and the earth, 5 is a power supply, 6 is a telephone cable, and 7 is a subscriber terminal. A plurality of subscriber circuits are mounted in one unit, and a subscriber terminal 7 is connected to subscriber terminal connection terminals 1 and 2 via a telephone cable 6. When the subscriber terminal 7 is in a calling or receiving state, the power supply 5 supplies communication current. A portion of the communication current is consumed as heat by the equivalent power supply resistances 3 and 4. The heat generated by this power consumption increases when a plurality of subscriber stations housed in the same unit are in a state of simultaneous communication, making the operation of the entire subscriber circuit within the unit unstable. It also causes significant deterioration of circuit components. Therefore, when multiple subscribers in a unit make simultaneous calls, this becomes an obstacle to achieving high-density packaging of subscriber circuits. This ensures stable operation of subscriber circuits.

A detailed explanation will be given below based on the drawings. FIG. 2 shows a first embodiment of the present invention. In Figure 2, 21.22 is the subscriber terminal connection terminal, 23.24 is the equivalent power supply resistance, and 25
is a communication current control circuit, 26 is a power supply for power supply, 27 is a ground air,
28 is a subscriber status monitoring circuit for monitoring the communication current flowing to the subscriber terminal, and 29 is a subscriber circuit control circuit. A plurality of subscriber circuits are mounted in one unit, and subscriber terminals 7 are connected to subscriber terminal connection terminals 21 . ,t
22, the communication current control circuit 25 is connected to the equivalent power supply resistor 23, 24, and the power supply is connected to the subscriber circuit control circuit 29 which receives the subscriber status signal from the subscriber status monitoring circuit 28.
It is controlled by the control signal. Next, the operation will be explained. First, when the subscriber terminal 7 is in a calling or receiving state, the power supply 26 supplies communication current. A portion of the communication current is consumed as heat in the equivalent power supply resistance 23,24. Among the subscribers accommodated in the same unit, the subscriber status monitoring circuit 28 selects a subscriber who is in a talking state.
．． It sends a reading and a subscriber status signal to the subscriber circuit control circuit 29. The subscriber circuit control circuit 29 identifies the subscriber status signal and determines whether the simultaneous call status of subscribers in the same unit exceeds a certain standard. When the force exceeds a certain standard, the subscriber circuit control circuit 29 sends a talk current stop signal to the talk current control circuits 25 of subscriber circuits other than those in use. Upon receiving the call current stop signal, the call current control circuit 25 operates to stop the supply of the call current supplied from the power supply 26, temporarily disabling calls from subscribers other than those who are currently talking. Next, when the simultaneous call status of subscribers in the same unit falls below a certain standard, the subscriber circuit control circuit 29 stops sending out the call current stop signal, and the call current control circuit 25
to cancel the operation. Therefore, the subscriber can make any calls.

As described above, by restricting the number of simultaneous call subscribers within the same unit that exceed a certain standard, power consumption within the same unit can be restricted and temperature rise within the unit can be suppressed. Therefore, there are many advantages such as ensuring stable operation of subscriber circuits, protecting circuit components, and enabling high-density packaging of units.

In the first embodiment, a method was explained in which the number of simultaneous calling subscribers within the same unit is limited to below a certain standard and the amount of heat generated within the unit is suppressed. show. The system shown in the figure uses a variable resistance circuit as the equivalent power supply resistance, and changes the resistance value in response to a communication current limit signal sent from the subscriber circuit control circuit, thereby limiting the communication current flowing through the subscriber circuit. A detailed explanation will be given below based on FIG. 3.

A subscriber status monitoring circuit 28 reads which subscriber is in a talking state among the subscribers accommodated in the same unit, and sends a subscriber status signal to a subscriber circuit control circuit 29. the subscriber circuit control circuit 29 identifies the subscriber status signal;
It is determined whether the simultaneous call status of subscribers within the same unit exceeds a certain standard. When it exceeds a certain standard, the subscriber circuit control circuit 29 sends a call current limiting signal to the variable equivalent power supply resistor circuit 3 of the subscriber circuit in use. Upon receiving the communication current limiting signal, the variable equivalent power supply resistor circuit 3 increases its resistance value to reduce the communication current.

By suppressing the call current flowing to each subscriber circuit during a call, the power consumed by the variable equivalent power supply resistor circuit 31 is reduced, and temperature rise within the same unit is limited.

In this way, temperature rise can be suppressed even when multiple subscribers in the same unit are talking. Therefore, stable operation of subscriber circuits can be ensured, circuit components can be protected, and units can be mounted in high density. It has many advantages such as

As explained above, since the present invention can suppress the total heat generation amount, it is easy to ensure stable operation of randomly generated high power operation circuits, and It can be used for subscriber circuit control that accommodates multiple subscribers in a private exchange.

[Brief explanation of the drawing]

FIG. 1 is a conventional subscriber circuit configuration diagram, FIG. 2 is a first embodiment of the subscriber circuit diagram according to the present invention, and FIG. 3 is a second embodiment of the subscriber circuit diagram according to the present invention. 1.2, 21.22...Subscriber terminal connection terminal, 3゜4
．． 23.24...Equivalent power supply resistance, 5.26...Power source, 6...Telephone cable, 7...Subscriber terminal, 25.
. . . Call current control circuit, 28 . . . Subscriber status monitoring circuit, 29 . . . Subscriber circuit control circuit, 31 . . . Variable resistance circuit. Figure 1 continued from page 1 ■Applicant Kamasha Hitachi Ltd. 5-1 Marunouchi-chome, Chiyoda-ku, Tokyo ■Applicant Fujitsu Ltd. 1015 Kamiodanaka, Nakahara-ku, Kawasaki City

Claims (1)

[Scope of Claims] 1. In a subscriber circuit of a subscriber exchange that accommodates a plurality of subscribers, a call current control circuit (25) is provided for each subscriber circuit, and the subscriber status monitors the call status of the subscriber circuit. A monitoring circuit (28) is connected to a subscriber circuit control circuit (29) for identifying its output signal, and the subscriber circuit control circuit (29) is connected to the monitoring circuit (28).
9) is connected to the call current control circuit (25) to block circuits of subscribers who are not making calls. 2. In a subscriber circuit of a subscriber exchange that accommodates multiple subscribers, a variable resistance circuit (31) is provided for each subscriber circuit,
A subscriber status monitoring circuit (28) for monitoring the call status of the subscriber circuit and a subscriber circuit control circuit (29) for identifying the output signal thereof are connected, and the subscriber circuit control circuit (29)
The output side of the circuit is connected to the variable resistance circuit (31) to control the communication current of the subscriber's circuit during a call.