JP2003143309A - Intercom unit for duplex house - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid wasteful power consumption by preventing a capacitor from being discharged even when a living room master unit makes a calling operation if the charged amount of the capacitor provided to an entrance slave unit as a switching operation power supply to select the living room master unit is insufficient. SOLUTION: The entrance slave unit 1 having capacitors 21, 31 to activate call button circuits 23, 33 that connects the called living room master unit to the entrance slave unit 1 to make a speech by applying calling operation to either of first and second living room master units 2a, 2b, is provide with voltage supervisory circuit sections 22, 32 that make no discharging operation to the capacitors 21, 31 even when the calling operation is made if the charging voltage of the capacitors 21, 31 does not reach a prescribed voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom system for two households in which two entrance masters are connected to one room master.

[0002]

2. Description of the Related Art In a house called a two-family house in which a parent's room and a child's room are independently provided for one entrance, one entrance child machine is used for both the parent and child households. An intercom system for two households with two master units will be installed. As such a door-comb device for two households, the conventional Japanese Patent Laid-Open No. 11-1
There is one disclosed in Japanese Patent No. 7819. This intercom system for two households includes a parent household intercom master unit (first living room master unit), a child household intercom master unit (second living room master unit),
Consists of one door-door intercom (entrance sub-unit), and the intercom sub-unit performs a call operation for the parent household intercom base unit and the parent household call button (first call button) and the child intercom base unit There are two call buttons for the child household call button (second call button), and the call button on the interphone base unit you want to call is operated to connect the intercom handset to the desired intercom base unit, and one of the intercom base units It is possible to make a call between the door phone and the cordless handset.

Switching of the intercom master unit is performed by a connection line switching circuit that is switched by a relay, and the relay performs the switching operation by discharging a storage battery provided for each call button in the intercom slave unit. Further, the battery is charged through the connection line connected to the corresponding intercom master unit, and is charged at any time as the call button is discharged.
However, this charging was performed with a relatively small current so as not to affect the nighttime indicator light provided in the connection line and the intercom slave.

[0004]

As described above, in the conventional door intercom apparatus for two households, the battery is charged with a small current. Therefore, if the call button is continuously pressed, the battery cannot be charged in time to call the battery. It stopped working,
If the call operation is continued by pressing the call button even if the call operation is not performed, the battery will continue to be discharged, so it will take more time for the stored charge to return to a state where the call operation is possible. There were difficulties.

As a configuration for solving this problem, it is conceivable to separately supply the power source of the intercom subunit, which is the entrance subunit, from the outside, but it requires an additional power adapter and the like, which is expensive and the power source at the entrance. Is difficult to secure, which is not preferable. In addition, it is conceivable to increase the current capacity of the connection line between the intercom master unit and the entrance slave unit, which are both master units in the room, but it is troublesome to replace the connection line of the existing intercom system.

In view of the above problems, the present invention, in a configuration in which the power of the entrance slave unit is supplied from the room master unit, charges the storage battery provided in the entrance slave unit as a switching operation power source for selecting the room master unit. It is an object of the present invention to provide an intercom system for two households in which the electric storage device is prevented from discharging even when a call is made to the master unit in the room when the amount is insufficient, thereby consuming no unnecessary power.

[0007]

In order to solve the above-mentioned problems, the invention according to claim 1 uses two room master units and one entrance slave unit connected to each of the room master units by two connecting lines. A doorphone device for two households, in which the power of the entrance slave unit is supplied from at least one of the room master units via a connection line, and the entrance slave unit calls each of the living room master units to perform two calling operations. The switch has a button, a switching unit that enables a call with one of the room masters that has been called by operating the call button, and a switching power supply unit that switches the switching unit. It is characterized in that it comprises a power storage device that is charged by a current supplied from the machine through a connection line and a switch circuit section that controls a discharging operation of the power storage device. With this configuration, it is possible to prevent discharging in an electric storage state that is insufficient for the switching unit to perform the switching operation, and it is possible to effectively perform discharging.

The invention of claim 2 is characterized in that, in the invention of claim 1, the switch circuit part is a voltage monitoring circuit part which prohibits a discharging operation until the charging voltage of the battery reaches a predetermined value. Thus, it is possible to always charge the battery in the shortest time without performing a meaningless discharging operation.

According to a third aspect of the present invention, in the first aspect of the present invention, if the switch circuit unit does not reach the predetermined value when the call button is operated, the charge voltage reaches the predetermined value. The present invention is characterized in that the timer circuit section prohibits the discharging operation for a predetermined time that allows sufficient charging. With this configuration, since the timer circuit section does not discharge for the predetermined time, it is possible to constantly charge the battery during that time.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a block diagram showing an example of an embodiment of the intercom system for two households according to the present invention, which is an entrance subunit 1 attached to a common entrance.
And a second living room parent machine 2b installed in, for example, a child household living room, and two living room parent machines 2a and 2b each have two connecting lines. It is connected to the front door subunit 1 via 3a and 3b.

Both of the room master units 2a and 2b are the entrance slave unit 1
A call detection circuit 4 that operates by the input of a call signal that is generated and transmitted from and transmitted through the connection lines 3a and 3b, respectively.
From a loudspeaker 5 that outputs a ringing sound (loud sound) generated by the ringing detection circuit 4 by a ringing signal, and a receiver 6a and a microphone 6b that transmit and receive a voice signal for a call with the entrance cordless handset 1. And a call circuit 7 to which the handset 6 is connected, respectively, and the two room masters 2a and 2b are supplied with power from power supply circuits 8 and 8 connected to a commercial power supply.

The entrance cordless handset 1 includes a connection line switching circuit 11 for connecting the entrance cordless handset 1 to one of the room master units, and a speaker 1.
4 and the microphone 15 are connected to each other, the intercom circuit 13 for sending a call signal to the room master unit, the first room master unit calling unit 20 for calling the first room master unit 2a, and the second room master unit 2b for calling the second room master unit 2b And the connection lines 3a and 3b which are connected to both the room master units 2a and 2b, respectively, and the connection line switching circuit 11 and the first and second room master unit calling units 20 and 3.
It is connected to 0. The intercom circuit 13 is connected via the connection line switching circuit 11. The intercom circuit 13 has photocoupler light-receiving portions 25b and 35b. Is sent. The connection line switching circuit 11 constitutes switching means together with call button circuits 23 and 33 which will be described later.

The connection line switching circuit 11 is composed of four relay switches 11a, 11b, 11c and 11d, and operates the intercom circuit 13 by the operation of the first living room master unit calling unit 20 or the second living room master unit calling unit 30. Connect to one of the room masters. In addition, 17 is a dummy circuit,
This is a circuit for preventing one of the room masters 2a and 2b, which is disconnected from the entrance slave 1, from being opened.

The first and second room master unit calling units 20 and 30 are
Connection lines 3a and 3b, both of which have the same configuration and are connected
Rectifying bridge circuits 12a and 12b for receiving a current supply regardless of the polarity of the rectifiers, accumulators 21 and 31 for accumulating the current from the rectifying bridge circuit, and voltage monitoring circuits 22 and 32 for monitoring the accumulating state as a switch circuit unit. A connection line connected to the first master unit 2a, which includes a switching power supply unit for switching the switching means, calling button circuits 23 and 33 for calling, and calling signal generation circuits 24 and 34. 3a is connected to the first living-room master unit calling unit 20, and the connection line 3b connected to the second living-room master unit 2b is connected to the second living-room master unit calling unit 30. Further, night indicator lights 19a and 19b formed of light emitting diodes are provided between the rectifying bridge circuits 12a and 12b and the capacitors 21 and 31.

Since both of the room master unit calling units 20 and 30 have the same circuit configuration, the first room master unit calling unit 20 will be described below. The power storage device 21 has a capacitor 21a that is charged and stored with a constant small current from the first room master device 2a when the entrance slave device 1 is in a standby state, and is charged with a minute current via the resistor 21b. Further, the voltage monitoring circuit unit 22 is formed of two transistors 22a and 22b, which are the first and second transistors 22a and 22d, and two resistors 22c and 22d, and the two resistors 22c and 22d connected in series have a capacitor 21 depending on the ratio. Since the base voltage which is the operating voltage of the second transistor 22b with respect to the charging voltage is determined, it is set to a predetermined ratio.

The call button circuit 23 is provided in the first room master unit 2a.
By pressing the first call button 23a for calling the two relays 23 using the discharge current from the electric storage device 21 as a drive source.
b and 23c operate, and the relay switches 11a and 11b forming a pair with the relays 23b and 23c perform a switching operation.
The relays 33c and 33c of the second room master unit calling unit 30 are paired with relay switches 11c and 11d.

The calling signal generation circuit 24 has a light emitting portion 25a of a photocoupler, and a voltage determined by the ratio of the two resistors 24b and 24c is applied to the base of the transistor 24a by the operation of the first calling button 23a to turn on the transistor 24a. Then, the light emitting unit 25a of the photocoupler emits light, and the light receiving unit 25b provided in the corresponding intercom circuit 13 performs detection operation. The intercom circuit 13 outputs a calling signal in response to the signal. However, this operation is when the charging voltage of the storage battery 21 is equal to or higher than a predetermined value, at which time the base voltage of the second transistor 22b becomes equal to or higher than the set value, and the first call button 23a is operated to turn on the first transistor 22a. Then, the operating currents of the relays 23b, 23c and the like are supplied, and the relays and the like operate. However, if the charging voltage of the battery 21 is less than a predetermined value, that is, the base voltage of the second transistor 22b determined by the ratio of the two resistors 22c and 22d is less than the operating voltage of the second transistor 22b, the first call button Even if the user presses 23a, the first transistor 22
a does not operate on.

In this way, the voltage monitoring circuit section 22 which is a switch circuit does not cause the discharging operation of the electric storage device 21 even if the first call button 23a is operated until the charged amount of the electric storage device 21 reaches a predetermined position. Similarly, the voltage monitoring circuit unit 32 of the second room master unit calling unit 30 does not cause the discharging operation of the power storage unit 31 even if the second calling button 33a is operated unless the charge amount of the power storage unit 31 has reached the predetermined amount.

Next, the operation of the intercom system for two households having the above-mentioned structure will be described. First, while the entrance slave unit 1 is in the standby state, the connection line 3a from the first living room parent device 2a and the second living room parent device 2b,
A current is supplied to the rectifying bridge circuit 12a via 3b, and the capacitors 21 and 31 are charged. And the storage battery 2
When the charging voltage of 1,31 is equal to or higher than a predetermined value, for example, the first
The first call button circuit 23 for calling the room main unit 2a
When the call button 23a is pressed, the voltage monitoring circuit unit 2
2 operates, the relays 23b and 23d operate by the current generated by the discharge of the electric storage 21, and the photocoupler 25 emits light. As a result, the relay switches 11a and 11b are switched by the operation of the relays 23b and 23c, and the first switch
The room master unit 2a is connected to the entrance slave unit 1, and the intercom circuit 1
3 generates a ringing operation signal.

Thus, the ringing signal output from the intercom circuit 13 is transmitted to the first room master unit 2a through the connection line switching circuit 11 and the connection line 3a, and the call detection circuit 4 of the first room master unit 2a is transmitted. When the speaker is activated, a loud sound (loud sound) is reported from the loud speaker 5.

When the charging voltage of the capacitors 21 and 31 does not reach the predetermined amount, the voltage monitoring circuit units 22 and 32 prohibit the discharging operation of the capacitors 21 and 31, so that the first call button 23a or the second call button is called. Even if the button 33a is pressed, the relays 23b, 23c, 33b, 33c do not operate, and the photocouplers 25, 35 do not operate either. Meanwhile, the battery 2
1, 31 continue charging.

As described above, by providing the switching power supply section in which the voltage monitoring circuit section is provided as the switch circuit in the battery, the call operation can be performed frequently when the charged amount of the battery is sufficient and the charging voltage is the predetermined value or more. The charging operation reduces the amount of electricity stored in the battery and the discharge voltage does not operate when the charging voltage is less than the predetermined value, which is insufficient for the operation of the switching means.Therefore, meaningless discharging operation is not performed and charging is always performed in the shortest time. Even if the calling operation is performed frequently, the calling operation can be reliably performed if the charge amount of the battery reaches a predetermined value.

When the first master unit 2a of the living room is in a calling state, the handset 6 of the master unit 2a of the first living room and the speaker 14 and the microphone 15 of the entrance slave unit 1 through the communication circuit 7 and the connecting line 3a are connected. In the meantime, it becomes possible to send and receive a voice signal for a call, and when the first room master unit 2a is called, the second room master unit 2b enters the standby state. In addition, to call the second office master unit 2b, by operating the second call button 33a,
The entrance slave unit 1 is electrically connected to the second master unit 2b in the room, a call signal is transmitted to the second master unit 2b in the room, and the call detection circuit 4 is connected.
And the ringing tone is reported from the loud speaker 5.
When the second room master unit 2b is in the calling state, the second
It becomes possible to transmit and receive a voice signal for a call between the handset 6 of the living room master unit 2b and the speaker 14 and the microphone 15 of the entrance slave unit 1, and while the second master unit 2b of the living room is called, the first
The room master unit 2a is in a standby state.

FIG. 2 is a block diagram showing another embodiment of the present invention. Explaining only the difference from the above embodiment, the configuration of the switch circuit section is different and the voltage monitoring circuit section is not provided, and the timer circuit section 27, 37 is provided. The same components as those in FIG. 1 are designated by the same reference numerals, and are provided in the timer circuit unit 27 provided in the first living room parent device calling unit 20a and the second living room parent device calling unit 30a. Timer circuit section 3
7 has the same circuit configuration, and is hereinafter referred to as the first unit master unit calling unit 2
The timer circuit unit 27 provided in 0a will be described.

The timer circuit section 27 includes a voltage detection circuit 27.
a, a timer circuit 27b, a transistor 27c for controlling on / off of a discharge current, and a drive circuit 27d thereof. When the first call button 23a is operated to make a call, the voltage detection circuit 27a causes the voltage of the storage battery 21 to rise. Is read, and if the voltage value is a predetermined value or more, the timer circuit 27
The transistor drive circuit 27d is driven without driving b to turn on the transistor 27c. If the voltage read by the voltage detection circuit 27a is less than the predetermined value, the timer circuit 27b starts the timer operation and does not turn on the transistor 27c until the time is up.

As described above, the timer circuit unit may be used as the switch circuit unit to manage the charging voltage of the battery by the time by the timer, and the set time of the timer is set to the operation of the switching unit when the amount of the battery stored decreases. If the charging voltage of the storage battery reaches the predetermined amount in the case of insufficient conditions, the charging will continue without discharging until the time elapses while the timer circuit is operating. Even if the call button is operated, the call operation is reliably performed after the set time has elapsed. Therefore, the calling operation can always be performed in the shortest possible time without wasteful discharging operation until the next calling operation.

In the above-described embodiment, the case where two room master units are provided for one entrance slave unit is shown. However, even if there are three master units or more, it corresponds to the entrance slave unit. It can be implemented by providing a calling circuit or the like.

[0028]

As described in detail above, according to the first aspect of the invention, the discharging operation of the electric storage device is controlled. Therefore, it is possible to prevent the switching means from discharging in an electric storage state insufficient for the switching operation. , It is possible to effectively perform the calling operation of the master unit in the room.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, if the charging voltage of the capacitor does not reach the predetermined value, the discharging operation does not take place, so that meaningless discharging operation may be performed. Therefore, it is possible to charge the battery in the shortest time at all times, and even if frequent re-calling operations are performed, the calling operation can be reliably performed if the charged amount of the battery reaches a predetermined value.

According to the invention of claim 3, in addition to the effect of the invention of claim 1, since the capacitor does not perform the discharging operation during the operation of the timer circuit portion, meaningless discharging operation is not performed and a predetermined time is not reached. When the time has passed, the calling operation can be reliably performed.

[Brief description of drawings]

FIG. 1 is a block diagram showing an example of an embodiment of a two-door intercom system according to the present invention.

FIG. 2 is a block diagram of a two-door intercom system showing another embodiment of the present invention.

[Explanation of symbols]

1 ... Entrance slave, 2a ... 1st room master, 2b ... 2nd
Living room master unit 3a, 3b ··· connection line, 11 · · connection line switching circuit, 12a, 12b · · rectifying bridge circuit, 20, 2
0a ··· First room master unit calling part, 21 ··
・ Voltage monitoring circuit, 23 ・ ・ Call button circuit, 23a ・
.First call button, 27 ... Timer circuit section, 30, 3
0a ··· 2nd room parent unit calling part, 31 ··
.Voltage monitoring circuit unit, 33 ... Call button circuit, 33a
・ Second call button, 37 ・ ・ Timer circuit section.

Claims (3)

[Claims] 1. A room master unit comprising two living room master units and one entrance slave unit connected to each of the living room master units by two connecting lines, wherein the power source of the entrance slave unit is from at least one of the living room master units. An intercom system for two households, which is supplied via a connection line, wherein the entrance slave unit calls and operates each master unit of the living room.
One call button, and switching means for enabling a call with one of the in-room masters that has performed a call operation by operating the call button,
A switching power supply unit for switching the switching means, wherein the switching power supply unit controls a discharging operation of the electricity storage device charged by a current supplied from the room master unit through a connection line. A doorphone device for two households, characterized in that it comprises a part. 2. The intercom system for two households according to claim 1, wherein the switch circuit unit is a voltage monitoring circuit unit that prohibits a discharging operation until the charging voltage of the capacitor reaches a predetermined value. 3. A predetermined time period in which the switch circuit unit can perform sufficient charging to reach a predetermined value if the charge voltage of the battery does not reach a predetermined value when the call button is operated. The intercom apparatus for two households according to claim 1, wherein the intercom device is a timer circuit section that prohibits the discharge operation during the period.