JP2001045158A - Interphone system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To save the power by intermittently charging an AC power, to be supplied to an interphone master set in a standby state, to a capacitor and using the charges stored in the capacitor for an operating power source thereby reducing the power consumption. SOLUTION: An AC power supply stabilized by a voltage circuit 13 used for an operating power supply of an interphone master set in a standby state and a call notice state is always supplied to a voltage detection circuit 15 via a feeding switch 14b in the standby state and charges intermittently a capacitor C1 under the control of the voltage detection circuit detecting a voltage level at a connecting point A denoting a voltage level across the capacitor C1 resulting from an operating state of a call detection circuit 16 and a call tone generating circuit 17. Furthermore, an AC power supply stabilized by the voltage circuit 13 used for an operating power supply of the interphone master set in a speech state with a doorphone 1 is supplied to a control circuit 10 and a speech circuit 20 via a feeding switch selected in interlocking with a hook switch 14a attended with a lifted-up handset 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intercom apparatus, and more particularly to an intercom apparatus for suppressing power consumption from an AC power supply during standby to save power.

[0002]

2. Description of the Related Art Conventionally, as this kind of intercom apparatus, an intercom apparatus having a configuration shown in a block diagram of FIG. 2 has been proposed. The intercom apparatus shown in the figure is a call function and a call function (not shown) that are installed at the entrance of a dwelling unit and allow a visitor to call a resident in the dwelling unit to establish a call.
, An intercom base unit 52 provided in the dwelling unit and provided with a call notification function for notifying a call from a visitor at the dwelling unit entrance and a call function for allowing the resident to establish a call with the visitor. And two lines L5
1, connected by L52.

The switching contacts and the reference potential point of the call / call control relay switch 61 are connected to line connection terminals T51 and T52 of the intercom master unit 52 to which the doorphone 51 is connected via lines L51 and L52, respectively. AC power supply AC10 via a power supply plug (not shown).
The primary side of the power transformer 62 is connected to the power supply connection terminals T53 and T54 connected to 0V. A power supply circuit 63 is connected to the secondary side of the power supply transformer 62. The power supply circuit 63 is connected to an AC power supply AC100 via the power supply transformer 62.
V is stabilized, and a power supply Vc51 is supplied to each circuit and element as an operation power supply in each of a standby state, a call notification state, and a call state of the intercom master unit, and is connected to a reference potential point.

An input terminal P51 of a control circuit (hereinafter referred to as a CPU) 60 using a power supply Vc51 supplied from the power supply circuit 63 as an operation power supply uses a power supply Vc51 similarly supplied from the power supply circuit 63 as an operation power supply. A normally closed contact of a call / call control relay switch 61 is connected via a call detection circuit 64, and a normally open contact is connected to an input terminal P52 of the CPU 60 via a resistor R51 to a power output unit of a power circuit 63. The switching contact of the hook switch 65 whose normally closed contact is connected to the reference potential point is connected.

The output terminal P53 of the CPU 60 is connected to one end of a speaker 67 whose other end is connected to a reference potential point via a ring tone generating circuit 66 using a power supply Vc51 supplied from a power supply circuit 63 as an operating power supply. ing. Also, the CPU 60
The output terminal P54 is connected to the base of a relay control transistor Q51 whose emitter is connected to a reference potential point via a resistor R52 and whose collector is connected to one end of a call / call control relay coil 68. The other end of the call / call control relay coil 68 is connected to the power supply output section of the power supply circuit 63, and the connection point between the resistor R52 and the base of the relay control transistor Q51 is connected to the reference potential point via the resistor R53. Have been. Further, the output terminals P55 and P56 of the CPU 60
Is connected to a control input unit of a communication circuit 69 including a 2-wire to 4-wire conversion circuit, a transmission amplifier, a reception amplifier, etc. (not shown) using the power supply Vc51 supplied from the power supply circuit 63 as an operation power supply. A normally open contact of a call / call control relay switch 61 and a handset 70 including a microphone and a receiver are connected to a voice input / output unit of the circuit 69.

[0006] In the intercom apparatus configured as described above, a power plug (not shown) is supplied from the AC power supply AC 100 V, and power supply connection terminals T53 and T5 of the intercom master unit 52 are provided.
4. The power supply Vc51 stabilized by the power supply circuit 63 via the power supply transformer 62 is supplied to each circuit and element as an operation power supply in the standby state, the call notification state, and the call state of the intercom master unit. ing.

Here, when the visitor activates the calling function of the intercom 51 installed at the entrance of the dwelling unit in order to call the resident in the dwelling unit, the internal resistance of the intercom is reduced and the line connection of the intercom base unit 52 is performed. The voltage level between the terminals T51 and T52 becomes Low (hereinafter, referred to as L) level, and a call detection signal (voltage signal) S51 is output to the CPU 60 from the call detection circuit 64 which has detected this voltage drop. CPU6
0 detects that the voltage level of the input terminal P51 to which the call detection signal S51 has been inputted changes from the High (hereinafter, referred to as H) level to the L level, and shifts from the standby state to the call detection (call notification) state. . CPU 6 in a call detection (call notification) state
The voltage level of the output terminal P53 of 0 changes from the L level to the H level, the ringing tone from the ringing tone generating circuit 66 in the active state is sounded by the speaker 67, and a resident in the dwelling unit is called from a visitor at the dwelling unit entrance. Will be notified.

When the resident of the dwelling unit who has confirmed the call from the visitor at the dwelling unit takes up the handset 70 of the intercom master unit 52, the normally open contact of the hook switch 65 is closed and the input of the CPU 60 is input. The power supply Vc51 is biased to the terminal P52 via the resistor R51. CPU 60 is powered by Vc
When the voltage level of the input terminal P52 biased at 51 is detected from the L level to the H level, the state is shifted from the call detection state to the call state by the call response. CPU in call state
When the voltage level of the output terminal P53 of the output terminal 60 changes from the H level to the L level, and the voltage levels of the output terminals P54, P55, and P56 change from the L level to the H level, the ringing of the ringing tone is stopped and The relay control transistor Q51 is turned on via R52, and the call / call control relay coil 68 is turned on. In conjunction with this, the normally open contact of the call / call control relay switch 61 is closed, and the call circuit When 69 is in the active state, a communication path between the handset 70 and the doorphone 51 is formed, and a call (two-way call) is established.

When the resident in the dwelling unit returns the handset 70 to end the call, the normally open contact of the hook switch 65 is opened, and the CPU 60 sets the voltage level of the input terminal P52 to the H level. From the communication state to the standby state due to the end of the communication, and the voltage level of the output terminals P54, P55, P56 is changed from the H level to the L level, thereby controlling the relay via the resistor R52. The call transistor Q51 is turned off, the call / call control relay coil 68 is turned off, and in conjunction with this, the normally open contact of the call / call control relay switch 61 is opened, and the call circuit 69 is turned off. It becomes inactive, and intercom master unit 52 is restored to the standby state.

[0010]

However, in the configuration of the conventional intercom apparatus, regardless of the difference between the standby state, the call notification state, and the call state of the intercom master unit 52, the power is supplied from the AC power supply AC100V. Since the power supply Vc51 stabilized by the circuit 63 is supplied to all the circuits and elements constituting the main unit of the intercom, the power supply efficiency from the power supply circuit 63 in the standby state with low power consumption is deteriorated, resulting in waste. Power consumption.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned difficulties, and the power consumption is reduced by intermittently charging a capacitor with AC power supplied to the intercom master unit in a standby state so as to be used as an operation power supply. It is an object of the present invention to provide an intercom device capable of suppressing power consumption.

[0012]

In order to achieve the above object, an intercom apparatus according to the present invention detects a call from a door phone by a call detection circuit of a base unit of the intercom, and generates a ring tone from a ring tone generation circuit. An intercom device that makes a sound from a speaker and makes it possible to talk with the intercom by using a communication circuit under the control of a control circuit that operates with a hook switch when the handset is picked up. The power supply is used while waiting for a call from the intercom. The capacitor is intermittently charged by the voltage detection circuit from the circuit and supplies power to the call detection circuit and the ringing tone generation circuit, respectively, and the hook switch is linked to the hook switch if the handset is picked up when there is a call from the door phone And a power supply switch for supplying power to the control circuit and the communication circuit from the power supply circuit.

According to such an intercom apparatus, the AC power source stabilized by the voltage circuit used as the operation power source of the intercom master unit in the standby state and the call notification state is:
Power is always supplied to the voltage detection circuit via the power supply switch in the standby state, and the voltage level at the connection point indicating the voltage level between both ends of the capacitor is detected due to the operation state of the call detection circuit and the ringing sound generation circuit. The capacitor is intermittently charged by the control of the voltage detection circuit. In addition, the AC power supply stabilized by the voltage circuit used as the operation power supply of the intercom master unit during the call with the doorphone is controlled via the power supply switch that is switched in conjunction with the hook switch when the handset is picked up. Circuit and communication circuit. Thereby, power consumption from the AC power supply of the intercom master unit in the standby state is suppressed, and power saving can be achieved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment to which an intercom apparatus according to the present invention is applied will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of an embodiment of an intercom apparatus according to the present invention. A call function and a call function (not shown) installed at a door of a dwelling unit to allow a visitor to call a resident in the dwelling unit to establish a call. ), An intercom base unit installed in the dwelling unit, a call notification function for notifying a call from a visitor at the dwelling unit, and a call function for allowing the resident to establish a call with the visitor. 2 are connected and configured by two lines L1 and L2.

The line connection terminal T of the intercom master unit 2 to which the intercom 1 is connected via the lines L1 and L2, respectively.
The switching contact of the call / call control relay switch 11 and the reference potential point are respectively connected to T1 and T2, and a power connection terminal T3, which is connected to an AC power supply 100V via a power plug (not shown). A power supply circuit 13 is connected to T4 via a power supply transformer 12. The power supply circuit 13 has an AC power supply of 100 V AC via a power supply transformer 12.
And is connected to a reference potential point. Note that the power supplied from the power supply circuit 13 is an operation power supply in a standby state and a call notification state of the intercom master unit by a power supply switch 14b interlocking with a hook switch 14a that is switched in accordance with picking up of a transceiver 21 described later. The power is supplied as a certain first power supply Vc1 or a second power supply Vc2 which is an operation power supply in a call state.

The power supply output of the power supply circuit 13 includes a switching contact and a normally closed contact of the power supply switch 14b, a voltage detection circuit 1
5 is connected to an emitter of a power control transistor Q1 whose base is connected to an output terminal P2 of a voltage detection circuit 15 via a resistor R1. A collector of the power control transistor Q1;
A connection point with one end of a capacitor C1 whose other end is connected to a reference potential point via a resistor R2 is defined as a connection point A. The connection point A has an input terminal P1 of the voltage detection circuit 15, a capacitor C1.
Power supply terminals (not shown) of a ringing detection circuit 16 and a ringing tone generation circuit 17 using the first power supply Vc1 charged to the power supply as an operation power supply
Are connected respectively. Further, the normally closed contact of the call / call control relay switch 11 has a call detection circuit 16,
One end of a speaker 18 whose other end is connected to a reference potential point via a ringing tone generating circuit 17 is connected.

An input terminal P of a control circuit (hereinafter referred to as CPU) 10 using a second power supply Vc2 as an operating power supply via a power supply switch 14b which is supplied and switched from the power supply circuit 13.
11, a normally open contact is provided with a power supply switch 14 via a resistor R3.
The switching contact of the hook switch 14a in which the normally closed contact is connected to the reference potential point is connected to the normally open contact b. The output terminal P12 of the CPU 10 is connected via a resistor R4 to the base of a relay control transistor Q2 whose emitter is connected to a reference potential point and whose collector is connected to one end of a call / call control relay coil 19, respectively. The normally open contact of the power supply switch 14b is connected to the other end of the call / call control relay coil 19, and the connection point between the resistor R4 and the base of the relay control transistor Q2 is connected to the reference potential via the resistor R5. Points are connected. Further, C
The output terminals P13 and P14 of the PU 10 are connected to a second power supply switch 14b which is supplied with power from the power supply circuit 13 and is switched.
The power supply Vc2 is used as an operating power supply, and a control input unit of a communication circuit 20 including a 2-wire to 4-wire conversion circuit, a transmission amplifier, a reception amplifier and the like (not shown) is connected. The normally open contact of the call control relay switch 11 is connected to the transmitter / receiver 21 composed of a microphone and a receiver.

The operation of the intercom apparatus configured as described above will be described below. While waiting for a call from the intercom master unit 2 in a standby state, that is, a call from the intercom 1 by a call operation of a visitor at the dwelling unit, the operation power source of the intercom master unit includes a power plug from AC power supply AC100V (see FIG. Not shown), the first power supply stabilized by the power supply circuit 13 via the power supply connection terminals T3, T4, the power supply transformer 12, the power supply circuit 13, and the first power supply line of the standby power supply switch 14b. Vc1 is used. The first power supply Vc1 is supplied as an operating power supply for the voltage detection circuit 15, and is charged in the capacitor C1 via the emitter and the collector of the power supply control transistor Q1 in the ON state. When the voltage level at the connection point A indicating the voltage level between both ends of the capacitor C1 is detected by the charging of the first power supply Vc1 to be equal to or higher than a predetermined threshold value at the input terminal P1 of the voltage detection circuit 15, the output terminal P2 When the voltage level is changed from the Low (hereinafter, referred to as L) level to the High (hereinafter, referred to as H) level, the power supply control transistor Q1 in the on state is stopped from being biased to the base and is turned off. , Charging of the capacitor C1 of the first power supply Vc1 stabilized by the power supply circuit 13 via the first power supply line is stopped,
Only power supply to the voltage detection circuit 15 is required, and power saving can be achieved.

Here, when the visitor activates the calling function of the intercom 1 installed at the entrance of the dwelling unit in order to call a resident in the dwelling unit, the internal resistance of the intercom is reduced, and the line connection of the intercom master unit 2 is performed. The voltage level between the terminals T1 and T2 becomes L level,
The ringing detection circuit 16 using the power supply Vc1 as the operating power supply detects the above-mentioned voltage drop, and similarly activates the ringing tone generating circuit 17 using the first power supply Vc1 charged in the capacitor C1 as the operating power supply. The ringing tone generating circuit 17 in the active state makes the speaker 18 ring a ringing tone, and notifies a resident in the dwelling unit of a call from a visitor at the dwelling unit entrance.

Further, the first power supply Vc1 charged in the capacitor C1 is consumed by the call detection circuit 16 and the ringing tone generation circuit 17 in the active state, and the voltage level at the connection point A indicating the voltage level across the capacitor C1 is consumed. Is the voltage detection circuit 15
When the input terminal P1 detects that the voltage is equal to or less than a predetermined threshold, the voltage level of the output terminal P2 changes from H level to L level, and the base of the power control transistor Q1 in the off state is biased to the on state. As a result, charging of the first power supply Vc1 to the capacitor C1 from the AC power supply 100V via the first power supply line, the emitter and collector of the power control transistor Q1 in the ON state, and the connection point A is started. When the voltage level at the connection point A indicating the voltage level between both ends of the capacitor C1 is detected by the charging of the first power supply Vc1 to be equal to or higher than a predetermined threshold value at the input terminal P1 of the voltage detection circuit 15, the output terminal P2 When the voltage level changes from the L level to the H level, the power supply control transistor Q1 in the ON state stops the bias to the base and enters the OFF state, so that the power supply circuit 13 is connected to the power supply circuit 13 from the AC power supply 100V via the first power supply line. The charging of the capacitor C1 of the stabilized first power supply Vc1 is stopped,
Only power supply to the voltage detection circuit 15 is performed.

Thus, the first power supply Vc1 which is an AC power supply stabilized by the voltage circuit 13 used as an operation power supply of the intercom master unit 2 in the standby state and the call notification state.
Is connected to the voltage detection circuit 15 via the power supply switch 14b in the standby state, and indicates the voltage level between both ends of the capacitor C1 due to the operation state of the call detection circuit 16 and the ringing tone generation circuit 17. The capacitor C is controlled by the voltage detection circuit 15 for detecting the voltage level at the point A.
Since the battery 1 is intermittently charged, power consumption from the AC power supply of the intercom master unit 2 in the standby state waiting for a call from the door phone 1 can be suppressed, and power saving can be achieved.

When the resident of the dwelling unit who has confirmed the call from the visitor at the dwelling unit picks up the handset 21 of the intercom master unit 2, the normally open contact of the hook switch 14a is closed, and Power supply switch 1 in conjunction with
The normally open contact 4b is closed, the power supply plug (not shown), the power supply connection terminals T3 and T4, the power transformer 12, the power supply circuit 13, and the switched contact of the switched power supply switch 14 are closed from the AC power supply 100V AC. Via the normally open contact second power supply line,
Power supply Vc2 is used. The second power supply Vc2 is supplied to the circuits and elements except for the voltage detection circuit 15 and the capacitor C1 to which the above-mentioned first power supply Vc1 is supplied.
, The voltage level of the input terminal P11 of the CPU 10 in which the second power supply Vc2 is biased changes from the L level to the H level, and the CPU 10 shifts from the standby state to the call state by the call response. An output terminal P12 of the CPU 10 in a call state;
The voltage levels of P13 and P14 change from the L level to the H level, and the relay control transistor Q2 is turned on via the resistor R4 to turn on the call / call control relay coil 1.
9 is turned on, the normally open contact of the call / call control relay switch 11 is closed in conjunction with this, and the call circuit 70
Becomes active, a communication path from the handset 21 to the door phone 1 is formed, and a call (two-way call) is established. At this time, the power supply state of the first power supply Vc1 to the voltage detection circuit 15 stabilized by the power supply circuit 13 from the AC power supply AC100V via the first power supply line is maintained.

Further, when the resident in the dwelling unit returns the handset 21 to end the call, the normally open contact of the hook switch 14a is opened, and in conjunction with this, the power supply switch 14b is turned on. When the normally open contact that is closed is opened, the power supply of the voltage detection circuit 15 and the circuits and elements other than the capacitor C1 forming the intercom master 2, that is, the operation power of the interphone master in the talking state is used. The power supply of a certain second power supply Vc2 is stopped, and C
PU10 becomes inactive and the output terminals P12, P13, P13
Since the voltage level of 14 changes from the H level to the L level, the transistor Q2 for relay control is turned off via the resistor R4, and the relay coil 19 for call / call control is turned off. The normally open contact of the relay switch 11 is opened, the communication circuit 20 is inactive, and the intercom master unit 2 is restored to the standby state.

In the above-described embodiment, the second power supply, which is an AC power supply stabilized by the power supply circuit of the intercom master unit in a talking state, is switched in conjunction with the hook switch when the handset is picked up. Although the power is supplied via the power supply switch, the present invention is not limited to this, and the same effects as those of the above-described embodiment can be obtained by using an electric switch or the like.

[0025]

As is apparent from the above description, according to the intercom apparatus of the present invention, the AC power supplied to the intercom master unit in the standby state is intermittently charged to the capacitor and used as the operating power. In addition, power consumption can be reduced and power consumption can be reduced.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of an embodiment of an intercom apparatus according to the present invention.

FIG. 2 is a block diagram showing a configuration of a conventional intercom apparatus.

[Explanation of symbols]

 1 Doorphone 2 Intercom master unit 10 Control circuit (CPU) 13 Power circuit 14a Hook switch 14b Power supply Switch 15 ····· Voltage detection circuit 16 ·················································· Speaker 20 ································ Handset C1 ······ Capacitor

Claims (1)

[Claims] A call from a door phone (1) is detected by a call detection circuit (16) of an intercom master unit (2), and a ring tone from a ring tone generation circuit (17) sounds from a speaker (18); If the handset (21) is taken up, an intercom apparatus which enables a telephone circuit (20) to communicate with the doorphone under the control of a control circuit (10) operated by a hook switch (14a), A capacitor (C1) which is intermittently charged by a voltage detection circuit (15) from a power supply circuit (13) during a call waiting state and supplies power to the call detection circuit and the ringing tone generation circuit, respectively;
A power supply switch (14b) for supplying power from the power supply circuit to the control circuit and the communication circuit in conjunction with the hook switch if the handset is picked up when the intercom is called; An intercom device characterized by the above-mentioned.