JPH0414356A - Ringer circuit driver for private branch of exchange - Google Patents

Abstract

PURPOSE:To simplify the wiring or the like, to employ a power supply with a small capacity as a telephone set supplying power supply and to make exchange small by using a switching means so as to superimpose currents of a power supply for telephone set and a power supply for a ringer circuit drive with each other. CONSTITUTION:A voltage for driving a ringer circuit impressed to a telephone set 12 depends on a voltage for a power supply 21 for driving the ringer circuit and a voltage of a power supply 30 for feeding a telephone set and a current for driving the ringer circuit by the voltage for driving the ringer circuit flows to the ringer circuit of the telephone set 12 via telephone set lines L1, L2 from a terminal connection section 14. A current whose direction varies repetitively with a ringer frequency flows to the ringer circuit of the telephone set 12, which is thereby driven. On the other hand, a negative terminal 30b of a power supply 30 for feeding the telephone set connects to a switch being a switching element 23 and is impressed to the telephone set via either of the telephone set lines L1, L2 in response to the make/break state of the ringing signal.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is directed to a private branch exchange (P.
r1vate Branch Exchange (hereinafter referred to as PBX), in more detail,
This relates to a BX ringer circuit drive device.

BACKGROUND OF THE INVENTION Conventional PBXs of this type drive the ringer circuit of the terminal telephone by separating the power supply for supplying power to the telephone and the power supply for driving the ringer circuit, or by superimposing the voltages of both power supplies. I was doing it.

Problems to be Solved by the Invention However, in these conventional PBXs, the power supply for powering the telephone and the power supply for driving the ringer circuit are separated, which requires troublesome wiring. The power supply for driving the ringer circuit requires high voltage, and the voltage of the power supply for driving the ringer circuit causes current to flow into the power supply for the telephone, so a large capacity power supply is required for the power supply for the telephone. The problem was that I had to use .

Therefore, an object of the present invention is to overlap the power supply for supplying power to a telephone and the power supply for driving the ringer circuit, and to eliminate the need for high voltage for the power supply for driving the ringer circuit, and to enable the use of a power supply with a small capacity as the power supply for supplying the telephone. An object of the present invention is to provide a ringer circuit driving device for a private branch exchange.

Means for Solving the Problems In order to achieve the above object, the present invention connects a direct current power source for driving a ringer circuit and a power source for driving a ringer circuit to a terminal connection part while repeatedly changing the electric polarity thereof. The power supply for supplying the telephone set and the power supply for driving the ringer circuit are connected to each other via a reverse current prevention element that prevents the current of the power supply for driving the ringer circuit from going around to the power supply for supplying the telephone set. It is connected to the switching means at the top.

Therefore, according to the present invention, the switching means overlaps the G4 source for powering the telephone and the power source for driving the ringer circuit, which simplifies the wiring, and furthermore, the reverse current prevention element prevents the current from the power source for driving the ringer circuit. Since the ri is prevented from going around to the telephone supply power supply, high voltage is not required for the ringer circuit driving Na, and a small capacity power supply can be used as the telephone supply power supply, making it possible to use a private branch exchange. The size can be reduced and the cost can be reduced.

EXAMPLE An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a schematic configuration of a PBX circuit driving device according to an embodiment of the present invention. In the figure, numeral 10 indicates the entire ringer circuit driving device of the PBX. 1
Reference numeral 2 denotes a terminal telephone, which is connected to the terminal connection section 14 of the PBX. Reference numeral 16 denotes a telephone communication circuit, which is connected to the communication circuit connection section 18 of the PBX.

21 is a DC ringer circuit driving power source, and 22 is a switching means 22 for connecting the ringer circuit driving power source 21 to the terminal connection portion 14 while repeatedly changing its electrical polarity. This switching means 22 is composed of a switching element 23 and a switching drive element 24 that drives this switching element 23. The ringer circuit driving power supply 21 has its positive terminal 21a connected to the first input terminal 23'a of the switching element 23, and its negative terminal 21b connected to the second input terminal 23'a of the switching element 23 via the reverse current prevention element 25. It is connected to the input terminal 23b. 23c is an output section of the switching element 23.

30 is a DC telephone power supply, and its positive terminal 30
a is grounded, and its negative terminal 30b is connected to the second input terminal 23b of the switching element 23 via the resistive element 31.

40 is a switching circuit for switching the telephone 12 between the ringer circuit driving device 10 and the telephone conversation circuit 16, and is composed of a switching element 41 and a switching driving element 42 that drives the switching element 41.

50 is a microprocessor that controls the switching drive element 24 of the circuit drive device 20 and the switching drive element 42 of the switching circuit 40.

Next, the operation of the above embodiment will be explained.

In order to drive the ringer circuit of the telephone 12 connected to this PBX, the microprocessor 50 sends a signal to the switching drive element 42 to drive the ringer circuit of the telephone 12 connected to this PBX.
1, thereby connecting the telephone 12 to the side of the ringer drive 10. Next, microprocessor 5
0 sends out the switching drive element 24 herringing signal.

This ringing signal is a signal that causes the switching element 23 to perform a switching operation at a ringing frequency (16 hertz or 20 hertz).

The transmission of this ringing signal will be explained with reference to FIG. FIG. 2 is a detailed diagram of the main parts of the ringer circuit driving device ff1lo, including the ringer circuit driving power supply 21, switching element 23, reverse current prevention element 25, telephone power supply power supply 30, and resistance element 31 shown in FIG. It shows. Considering the case where the switching element 23 is composed of a plurality of current control elements, four switches 31 to S are shown in FIG.
4, which is functionally the same as that shown in FIG. Furthermore, the switching circuit 40 in FIG.
It is omitted in the figure.

The ringer circuit driving voltage applied to the telephone set 12 is determined by the voltage of the ringer circuit driving power supply 21 and the voltage of the telephone power supply power supply 30, and the ringer circuit driving current due to this ringer circuit driving voltage is applied to the terminal connection part. From 14, Ll and L2
to the ringer circuit of the telephone 12 via the telephone line. The ringing signal is a signal that repeats on and off at the ringing frequency. When this ringing signal is on, the switches S2 and 38 of the switching element 23 are turned on, and the switches S1 and 84 are turned off, and the ringing signal is turned on. The circuit drive current flows in the direction of arrow D1 in FIG.

Further, when the ringing signal is off, the switches S1 and 84 of the switching element 23 are turned on, the switches S2 and 38 are turned off, and the ringer circuit driving current flows in the direction of arrow D2. This causes a current to flow through the ringer circuit of telephone 12 that repeatedly changes direction at the ringer frequency, thereby driving the circuit. On the other hand, since the negative terminal 30b of the telephone power supply 30 is connected to the switches S8 and S34 of the switching element 23, the telephone power supply 30 is connected to either Ll or L2 depending on whether the ringing signal is turned on or off. It is applied to the telephone via the line.

Furthermore, a ringer circuit driving power source 21 and a telephone power supply power source 3 are provided.
0 by the reverse current prevention element 25, the current of the ringer circuit driving voltage ti, 21 is prevented from going around to the telephone power supply 30. This reverse current prevention element 25 can be composed of, for example, a diode. In that case, the anode of the diode is connected to the resistive element 31 connected to the negative terminal 30b of the telephone power supply 30, and The cathode may be connected to the negative terminal 2 lb of the power supply 21 for driving the ringer circuit.

Effects of the Invention The present invention comprises a direct current power source for driving a ringer circuit, and a switching means for connecting the power source for driving a ringer circuit to a terminal connection part while repeatedly changing its electrical polarity, and a power source for supplying a telephone set. Since Lin connected the circuit driving power source to each other through a reverse current prevention element that prevents the current of the circuit driving power source from going around to the telephone supply power source, and then connected it to the switching means, this switching means Since the power supply for powering the telephone and the power supply for driving the ringer circuit are overlapped, wiring etc. are simplified, and
Since the reverse current prevention element prevents the current of the power supply for driving the ringer circuit from going around to the power supply for supplying the telephone, high voltage is not required for the power supply for driving the ringer circuit, and the 861 with a small capacity can be used as the power supply for supplying the telephone. It has the effect that it can be used. Furthermore, for that purpose,
It is possible to downsize the horizontal switch and reduce its cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of a ringer circuit driving device for a PBX according to an embodiment of the present invention, and FIG. 2 is a detailed diagram of the main parts of the ringer circuit driving device. 10... Ringer circuit drive device, 12... Telephone, 1
4... Terminal connection section, 21... Ringer circuit drive power supply,
22... Switching means, 30... Telephone power supply, 31... Reverse current prevention element. Name of agent: Patent attorney Shige Awano Takahaka 1 person - 31
:

Claims (1)

[Claims] A ringer circuit driving device for a private branch exchange equipped with a terminal connection part connected to a telephone and a power supply for powering the telephone, the ringer circuit driving power supply having a DC ringer circuit and the power supply for driving the ringer circuit repeatedly changing the electrical polarity thereof. switching means for connecting the telephone set supply power supply and the ringer circuit drive power supply to the telephone set supply power supply while preventing current from the ringer circuit drive power supply from going around to the telephone set supply power supply. A ringer circuit driving device for a private branch exchange, which is connected to each other through a reverse current prevention element and then connected to the switching means.