JP3528194B2 - Terminal box for door phone connection - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an intercom connection terminal box that enables a call between a cordless telephone and an intercom by connecting to a cordless telephone master unit.

[0002]

2. Description of the Related Art FIG. 4 is a diagram showing a system configuration example of a conventional cordless telephone capable of communicating with an intercom. The cordless telephone base unit 50 and the intercom 53 are connected to each other via the intercom connection terminal box 54 having a built-in call circuit (not shown).
And the intercom connection terminal box 54 are different A
Power is supplied from the C100V power supply. Further, the cordless telephone handset 51 is placed on a charging stand 52 which is supplied with power from an AC100V power supply different from the AC100V power supply described above, and is always charged except during a call.

As described above, the intercom connection terminal box 54 includes the cordless telephone master unit 50 and the intercom 5.
Each of the three communication circuits is built in, and these communication circuits require a separate AC100V power source from the cordless telephone. Therefore, when connecting the cordless telephone and the intercom 53, it is necessary to install the intercom connection terminal box 54 without exception, and to secure the installation place.

FIG. 5 is a view showing the intercom connection terminal box 54 and the power supply unit of the charging stand 52 shown in FIG. In the intercom connection terminal box 54, the power source of the call circuit 58 of the intercom 53 and the call circuit 59 of the cordless telephone master unit 50 receives the AC currents individually stepped down by the transformers 57, and 12 VDC in each call circuit. It is designed to be rectified and used. Further, in the charging stand 52, the power source of the charging circuit 56 of the cordless telephone slave unit 51 receives the AC current stepped down by the transformer 55 and rectifies it to 5 VDC in the charging circuit 56 for use.

Here, as an example in which the intercom connection terminal box 54 and the charging stand 52 are integrated in order to make the installation place of the intercom connection terminal box 54 unnecessary, one transformer is provided as shown in FIG. When power is supplied from 60 to the charging circuit 62 (without a rectifying circuit inside), the communication circuit 58 and the communication circuit 59, the charging circuit 62
Requires a power supply of 5 VDC, so it was necessary to reduce the voltage by the rectifier circuit 61. This is the same regardless of whether the charging circuit 62 is taken out from the transformer in common with the communication circuit 58 or in common with the communication circuit 59.

However, since a relatively large current flows through the charging circuit 62, there is a problem that if the current is greatly reduced by the rectifier circuit 61, the amount of heat generated cannot be ignored.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a terminal box for intercom connection which does not need to be separately placed when connecting intercom to a cordless telephone. And

[0008]

A terminal box for intercom connection according to the present invention as claimed in claim 1, which is proposed to achieve the above object, is for charging a cordless telephone handset.
Cordless telephone base unit and door
A terminal box for intercom connection that is used by connecting to a phone
The commercial power supply is stepped down to the first voltage level.
And a second level higher than this first voltage level.
Step-down transformer with power supply terminal for extracting voltage level
And a call circuit for intercom that does not have a built-in rectifier circuit,
A call circuit for a cordless telephone master unit with a built-in rectifier circuit,
Equipped with charging circuit for cordless handset with built-in flow circuit
Well, take out the first voltage level of the step-down transformer
The power supply terminal is the charging circuit for the cordless handset
Connected to the output side and the output side
Connected to the input side of the voltage doubler rectifier connected to the
Take out the second voltage level of the step-down transformer
The power supply terminal is the call circuit for the above cordless telephone base unit.
It is configured to be connected to.

[0009] Further , according to claim 2, which is proposed at the same time.
The terminal box for intercom connection according to the present invention is
-Dress phone integrated into the cordless handset charging station
-Door to be used by connecting to the dress telephone base unit and door phone
A terminal box for connecting a
The first voltage level and this first voltage level
Power supply that takes out the second voltage level of higher level
Door with built-in rectifier circuit and step-down transformer with terminals
Cordless with no built-in phone call circuit or rectifier circuit
Cordless phone with built-in call circuit and rectifier circuit for main phone
And a charging circuit for a speaker unit,
The power supply terminal for extracting one voltage level is the above code
Output side while being connected to the charging circuit for wireless telephone handsets
Is connected to the above cordless telephone base unit circuit
Connected to the input side of the current circuit and
The power supply terminal for extracting the second voltage level is
It is connected to the call circuit for doorphones.

[0010]

In the doorphone connection terminal box according to the present invention as set forth in claims 1 and 2, since the doorphone connection terminal box is built in and integrated with the charging stand of the cordless telephone handset, the doorphone connection terminal box No installation space is required. Also take from the transformer
Cordless output is common to the charging circuit of the above charging stand
Since the voltage doubler rectifier circuit is used in the power supply unit of one of the telephone main unit and the intercom of the intercom, the charging circuit of the above charging stand does not need to be greatly stepped down by the rectifier circuit and the amount of heat generation increases. The problem can be solved.

[0011]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing a system configuration example of a cordless telephone using the intercom connection terminal box according to the first aspect of the present invention. The cordless telephone base unit 50 and the intercom 53 are connected to each other via an intercom connection terminal box 10 built in a charging stand 16 fixed to a wall surface or the like. Then, the respective call circuits (not shown) of the cordless telephone master unit 50 and the intercom 53 in the terminal box 10 for connecting the intercom.
And the charging circuit (not shown) of the charging stand 16 have the same AC1
Power is supplied from the 00V power source, and the cordless telephone slave unit 51 is placed on the charging stand 16 as in the conventional case, and is constantly charged by a charging circuit (not shown) except during a call.

Therefore, the cordless telephone and the intercom 53
If you have a place to install the charging stand 16 to connect with
The installation place for the intercom connection terminal box 10 is unnecessary, and the installation work is also unnecessary. Figure 2
Is a terminal box for connecting an intercom of the present invention (claim
It is the figure which showed the example of a principal part structure of the power supply part in 1) .

In FIG. 2, 11 is a transformer and 12 is an A.
Double voltage rectifier circuit that obtains DC voltage twice as much as C power supply voltage, 13 is a call circuit that does not have a rectifier circuit for intercom 53, 50 is a cordless telephone master unit, 51 is a cordless telephone slave unit, and 56 is a cordless telephone A charging circuit having the rectifier circuit of the telephone slave unit 51 built therein, and a call circuit 59 having the rectifier circuit of the cordless telephone master unit 50 built therein.

The power supply unit of the intercom connection terminal box 10 'having such a configuration will be described below. Trang
The power supply terminal 11 supplies the first and second voltage levels.
When the charging circuit 56 and the communication circuit 13 are commonly taken out, a voltage of 7V, which is slightly higher than the voltage of 5V required for the charging circuit 56, is stepped down and supplied as the first voltage level.
It is In the charging circuit 56, this AC7V is applied to the charging circuit 5
It is used as a power source by rectifying the voltage slightly within 6 and rectifying it. On the other hand, the call circuit 13 requires 12V DC, and in the voltage doubler rectifier circuit 12, the above AC7V is converted into a DC voltage of about 14V, which is slightly stepped down in the call circuit 13 to be used as a power supply. There is.

The call circuit 59 requires DC 12V, and the transformer 11 drops the second voltage down to 12V.
The pressure level is rectified in the communication circuit 59 to be used as a power source.
FIG. 3 shows a terminal box for connecting the intercom of the present invention (contractor).
It is a figure showing an example of important section composition of a power supply section in requirement 2) , and attaches the same numerals to the same portion as Drawing 2 , and omits explanation.

In FIG. 3, reference numeral 14 is a transformer, 15 is a speech circuit without the rectification circuit of the cordless telephone master set 50, and 58 is a speech circuit with a rectification circuit of the intercom 53. The power supply unit of the intercom connection terminal box 10 ″ having such a configuration will be described below.

Terminal box 10 "for intercom connection
Is different from the intercom connection terminal box 10 'shown in FIG. 2 above, except that the charging circuit 5 from the transformer 14 is used.
The point 6 is taken out in common with the call circuit 13 in the above-mentioned intercom connection terminal box 10 ′, but in common with the call circuit 15. With this,
The mounting position of the voltage doubler rectifier circuit 12 is moved to the front of the communication circuit 15.

In the transformer 14, in the common extraction of the charging circuit 56 and the communication circuit 15, the voltage is lowered to 7V which is slightly higher than the voltage of 5V required for the charging circuit 56. In the charging circuit 56, this AC7V is slightly stepped down and rectified in the charging circuit 56 to be used as a power source. On the other hand, in the call circuit 15,
DC12V is required, and in the voltage doubler rectifier circuit 12, the above-mentioned AC7V is converted into a DC voltage of about 14V, which is stepped down in the communication circuit 15 to be used as a power supply.

The call circuit 58 requires DC 12V, and the voltage stepped down to 12V in the transformer 14 is rectified in the call circuit 58 to be used as a power source. Although the above embodiment has been described using voltage values such as 5V and 7V,
It goes without saying that the same can be done with other voltage values.

[0020]

According to the intercom connection terminal box of the present invention as set forth in claims 1 and 2 , since the intercom connection terminal box is built in and integrated with the charging stand of the cordless telephone subunit, the cordless telephone. If there is a place to install the charging stand for connecting the doorphone with the doorphone, the place to install the terminal box for connecting the doorphone is unnecessary, and the installation work is also unnecessary.

The charging from the transformer is the above-mentioned charging.
Cordless telephone base unit and door that are common with the charging circuit of the stand
Since a voltage doubler rectifier circuit is used in the power supply section of one of the telephone call circuits, it is possible to solve the problem of a large amount of heat generation because the charging circuit of the charging stand does not have to be stepped down significantly by the rectifier circuit. .

[Brief description of drawings]

FIG. 1 is a diagram showing a system configuration example of a cordless telephone using the intercom connection terminal box according to the first aspect of the present invention.

FIG. 2 is a diagram showing a configuration example of a main part of a power supply unit in the intercom connection terminal box (claim 1) according to the present invention.

FIG. 3 is a diagram showing a configuration example of a main part of a power supply section in a doorphone connection terminal box (claim 2) according to the present invention.

FIG. 4 is a diagram showing a system configuration example of a conventional cordless telephone that can communicate with an intercom.

FIG. 5 is a view showing a conventional intercom connection terminal box and a power supply unit of a charging stand.

FIG. 6 is a diagram for explaining a problem in integrating the intercom connection terminal box and the charging stand.

[Explanation of symbols]

10, 10 ', 10 "... Terminal box 11 for intercom connection 11, 14 ... Transformer 12 ... Double voltage rectifier circuit 13, 15 ... Call circuit 16 ... Charging stand 50 ... Cordless telephone Base unit 51 ... Cordless telephone handset 53 ... Doorphone 56 ... Charging circuit

Claims (2)

(57) [Claims] 1. A cordless telephone handset built into a charging stand
It is integrated and connects to cordless phone base unit and door phone
Is a terminal box for connecting door phones
Then, the commercial power supply is stepped down and the first voltage level and this first
Extract a second voltage level that is higher than the voltage level
, A step-down transformer with a power supply terminal, a call circuit for intercom without a built-in rectifier circuit , a rectifier circuit
Call circuit and rectifier circuit for cordless telephone base unit with built-in channel
And a charging circuit for a cordless telephone handset that has a built-in power supply for extracting the first voltage level of the step-down transformer.
The power supply terminal is connected to the charging circuit for the cordless handset above.
And the output side is connected to the above-mentioned intercom communication circuit
It is connected to the input side of the connected voltage doubler rectifier circuit and outputs the second voltage level of the step-down transformer.
The power supply terminal is connected to the call circuit for the above cordless telephone base unit.
The terminal box for connecting the intercom , which has been continued . 2. The cordless telephone cordless handset is built in the charging stand.
It is integrated and connects to cordless phone base unit and door phone
Is a terminal box for connecting door phones
Then, the commercial power supply is stepped down and the first voltage level and this first
Extract a second voltage level that is higher than the voltage level
It includes a step-down transformer with a power supply terminal, a doorphone communication circuit with a built-in rectifier circuit, and a rectifier circuit.
Calling circuit and rectifier circuit for cordless telephone base unit not stored
And a charging circuit for a cordless telephone handset that has a built-in power supply for extracting the first voltage level of the step-down transformer.
The power supply terminal is connected to the charging circuit for the cordless handset above.
And the output side is for the above cordless telephone base unit
Connected to the input side of the voltage doubler rectifier circuit connected to the circuit,
Also, the voltage for extracting the second voltage level of the step-down transformer is taken out.
The power supply terminal is connected to the above-mentioned door phone call circuit.
A terminal box for connecting doorphones.