JPH0644208Y2 - Powered rosette - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to an improvement of a rosette for connecting a cable from a central office or a private branch exchange to a telephone cord.

(Prior Art) There is a rosette as a device for connecting a central office line or a private branch exchange to a terminal such as a telephone. A conventional rosette has a structure as shown in FIG. 5, and has two terminals 4 for connecting a telephone line cable 2 from a station and a telephone cord 3 which is a telephone cord in the rosette body 1. The cable 2 from a station or the like is connected to one end of the terminal 4, and the telephone cord 3 is connected to the other end.

By the way, the cable 2 from a central office switch or a private branch exchange (hereinafter, referred to as an exchange) is not only used for transmitting and receiving signals between the exchange and a telephone, a relay stand, etc., but also the connection terminal 4 is connected from the exchange. A DC voltage is supplied to the telephone set, a relay stand, etc. through the telephone cord 3. In other words, the cable from the exchange is composed of two signal lines per line, and 0V and -49V are applied to these two signal lines. The switch controls the call by performing operations such as switching between -49V and -49V.
Utilizing the potential of V, a power source for driving a processor such as a multifunctional telephone, a display element, and a light emitting element is obtained.

(Problems to be solved by the invention) As described above, the rosette connects the cable 2 for transmitting and receiving signals from the exchange side and the power supply and the telephone cord 3 by the connection terminal 4, but the exchange side and the telephone set. If the cable length between the switchboard and the relay stand is long, the power supply voltage from the exchange side is attenuated due to the impedance of the cable, and it becomes impossible to supply the necessary power to the telephone set, the relay stand, etc. with only one line. In such a case, a method may be adopted in which AC is converted to DC and voltage is converted from a commercial AC power supply by an AC / DC converter, and the power is supplied by being converted into power that is insufficient for power supply from the exchange side. In this method, if the phone has a built-in AC / DC converter so that it will not get in the way, the phone housing will be large, and a code for connecting to a commercial 10 V AC will be required. A problem occurs and two cords, the cord for the telephone and the cord for connecting the commercial AC 100V, come out from the telephone, which is not good in appearance.

In addition, the AC / DC converter can be
There is also a method of using a C adapter, but in this case, although the phone case does not become large, a power cord is necessary, so in this case also, there is a problem with the place where the phone is installed, and there is a problem with the phone cord and AC adapter connection cord. These two codes come out of the phone, which is not good for aesthetics.

Therefore, the purpose of this invention is to provide a power supply function that does not require a large case for the telephone, and does not require any number of cords to prevent installation problems or aesthetic problems. It is to provide a rosette with.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention is configured as follows. That is, an AC / DC converter that converts the commercial AC power supply output to the required DC voltage and outputs it is provided in the rosette for connecting the telephone line from the exchange and the terminal, and the DC output of this AC / DC converter is also provided. And a power supply terminal for supplying to the terminal.

(Function) The present invention provides an AC / DC converter in the rosette, which converts the voltage from the commercial AC power supply, and two power supply terminals provided in addition to the connection terminal for connecting the telephone line cable from the exchange side. The output is made to the connection terminal of. In this way, the AC / DC converter provided in the rosette produces the necessary direct current from the AC power supply, and outputs this to the power supply terminal provided separately from the station cable connection terminal. By separately connecting these terminals to each other using a wire cord and taking a power source, it becomes possible to supplement the required power without enlarging the housing of the telephone or spoiling the appearance.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of a power supply type rosette 1a according to the present invention. In the figure, elements having the same functions as those of the conventional example shown in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted. This device transforms a commercial AC power supply into the main body of the rosette 1a, and incorporates an AC / DC converter 8 which converts a desired voltage into a direct current, for example, −49 V and outputs the converted voltage.
The terminals are configured by providing a pair of line connection terminals 5 for connection with a cable on the exchange side and a pair of power supply connection terminals 6 for extracting the output of the AC / DC converter 8. When it is necessary to feed power, the telephone connected to the rosette 1a uses a telephone string 7 having a 4-wire structure, and 2 of these 4 wires (7a) are used as a cable on the exchange side (also serve as a signal line and a power supply line). Hereinafter, referred to as line connection), and connected to the connection terminal 5. The remaining two wires (7b) are used as power supply lines and connected to the connection terminal 6. 9 is built-in AC / D
A power cord for the C converter 8 for connecting to a commercial power source.

When the telephone connected to the rosette 1a needs power supply from the AC / DC converter 8, a circuit as shown in FIG.

That is, R1 and R2 are fuse resistors, and CD1 and C2 are
D2 is a diode bridge. One of the four-wire telephone strings 7 for line connection is connected to the AC side input terminal (-) of the diode bridge CD1 through the fuse resistor R1 and the other directly.
A Zener diode ZD1 for reverse voltage connection connected in the reverse direction is connected between the DC side output terminals (+,-) of the diode bridge CD1, and the DC side output terminals (+,-) of the diode bridge CD1 are connected. It is connected to the telephone communication system of the telephone body via a transmission transformer that transmits signal components, and the DC bridge side output terminals (+, –) of the diode bridge CD1 are connected to the power supply line of the telephone body via choke coils L1 and L2. Connected to. C is a transmission transformer
This capacitor is connected in series to the + input line of T1 and is used to cut DC components. In addition, one of the four-wire telephone strings 7 that supplies power is supplied through the fuse resistor R2, and the other is directly connected to the diode bridge CD.
It is connected to the AC side input terminal (~) of 2. A Zener diode ZD2 for reverse voltage connection connected in the reverse direction is connected between the DC side output terminals (+,-) of the diode bridge CD2, and the DC side output terminals (+,-) of the diode bridge CD2 are connected. It is connected to the power line of the telephone body.

Among the telephone strings 7, the one for connecting the line applies the DC voltage and the signal sent from the exchange side to the diode bridge CD1 via the fuse resistor R1, and the signal component is superimposed on the DC component by the diode bridge CD1. It is captured in the form. Then, this is supplied as a DC voltage to the power supply line of the telephone body through the choke coils L1 and L2, and the DC component cut by the capacitor C is sent to the transmission transformer T1. It amplifies the signal components that have been cut into only the signal components and outputs them to the telephone call system. On the other hand, the output of the AC / DC converter 8 in the rosette 1a is the diode bridge C
It is supplied to the power supply line of the telephone body through D2 and is superimposed on the DC voltage supplied from the exchange to compensate for the shortage of the DC voltage supplied from the exchange. Also, when an overvoltage is supplied, the overvoltage component flows through the Zener diodes ZD1 and ZD2, so it is suppressed, and when a large current flows, the fuse resistors R1 and R2 are cut off and cut off the input, and the circuit on the telephone body side. Protect.

As shown in FIG. 4, a voltage is detected between the DC side output terminals (+, −) of the diode bridge CD1 and the choke coils L1, L2, and compared with a predetermined reference voltage to generate a control output. A voltage detection circuit VD is provided, and a switch SW that is turned on / off by the output of the voltage detection circuit VD is provided between the DC output terminals (+, −) of the diode bridge CD2 and the power supply line of the telephone body. The power supply voltage from the exchange side is a predetermined voltage necessary for operation on the telephone side, for example, −
When the voltage drops below 49V, the switch SW is closed and the DC side output terminal output of the diode bridge CD2 is supplied to the power supply line of the telephone body, and the power supply voltage from the exchange side is the above specified voltage required for operation on the telephone side. If the switch SW is opened to maintain the output on the DC side of the diode bridge CD2 while maintaining, the AC power is supplied only when the power supply voltage from the exchange side divides the predetermined voltage required for operation on the telephone side. The output of the / DC converter 8 can be supplied to compensate for the shortage.

FIG. 2 is a system configuration diagram in the case of using the telephone body having such a circuit and the above-mentioned power feeding type rosette 1a. The cable 2 of the one-line / two-wire configuration from the station 10 enters the power feeding type rosette 1a. , The power supply type rosette 1a and telephone,
Of the four-line telephone string 7 that connects to the relay stand 11 or the like, reference numeral 7a
The two lines from the station are connected to each other, and the remaining two lines shown by reference numeral 7b supply the DC voltage converted by the AC / DC converter 8 of the power supply type rosette 1a to the telephone set, the relay stand 11 and the like.

As described above, according to the present invention, the AC / DC converter is provided inside the rosette, and the necessary power is supplied by one 4-wire telephone cord. Since it does not need to be built in or used with an AC adapter, it suppresses the size of the phone and improves its appearance. Moreover, since the cord for the AC power supply is provided in the rosette, the problem of the installation location of the telephone can be solved.

The present invention is not limited to the embodiments described above and shown in the drawings, and it is needless to say that the present invention can be appropriately modified and implemented without changing the gist of the invention. For example, a connection method between a cable and a rosette is specified. It also does not specify the number of cables to connect to the rosette. Further, the input circuit composed of the fuse resistor R2, the diode bridge CD2, and the Zener diode ZD2 on the side of the telephone body for receiving the output of the AC / DC converter may be provided in the rosette 1a.

[Effects of the Invention] As described above, according to the present invention, the AC / DC converter is provided inside the rosette, and the necessary electric power is supplied by one 4-wire telephone cord. Since it does not need to be built into the phone case or used with an AC adapter, it prevents the phone from becoming large and greatly improves aesthetics. Moreover, since the cord for the AC power supply is provided in the rosette, the problem of the installation location of the telephone can be solved.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is a block for explaining an outline of a system using this device,
3 and 4 are diagrams showing examples of connection circuits on the telephone side, and FIG. 5 is a diagram showing a conventional example. 1a: power supply type rosette, 5 ... line connection terminal, 6 ... power supply connection terminal, 7 ... telephone string, 8 ... AC / DC converter,
9 ... Power cord.

Claims (1)

[Scope of utility model registration request] 1. An AC / DC converter for converting a commercial AC power supply output into a required DC voltage and outputting the same in a rosette for connecting a telephone line from an exchange or the like to a terminal, and this AC / DC converter. A power supply type rosette, characterized in that a power supply terminal for supplying the DC output of the above to the terminal is provided to enable independent DC power supply.