JPH0339975Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a telephone that can use coins and telephone cards at the same time. The present invention relates to a power supply control device for a telephone that switches to a telephone.

[Conventional technology]

In recent years, public telephones that accept telephone cards in addition to conventional coins have become popular. In such coin/telephone card type telephones, the card is inserted into the card slot and pulled in to the position where the magnetic head is located, the number of calls recorded on the card is read, and the number of calls recorded on the card is read. A card processing mechanism is built in to write the remaining call count and to eject the card after writing. Since this card processing mechanism incorporates components that consume a large amount of power, such as a motor that drives a roller, the driving power for this card processing mechanism is supplied from a commercial power source via a power supply circuit.

In addition, the telephone circuit that inputs the transmit signal from the handset and sends the receive signal to the handset has low power consumption, so the line current flowing through the signal line connecting the telephone and the central office switching equipment is used. It is also possible to drive this communication circuit by Furthermore, since the insertion of a coin into the coin slot can be detected by the closing operation of the coin contact, which is activated by the coin's own weight, the power consumption of the coin handling mechanism is also low. Therefore, some telephones are configured so that when the commercial power supply of 100 V AC is out of power, cards cannot be used, but coins can be used to make calls.

When using such a phone, if the number of calls remaining on the card is low, if you insert a coin during a call before the number of calls remaining on the card reaches zero,
When the remaining number of calls on the card reaches zero, the call will automatically switch to using coins.

[Problem that the invention attempts to solve]

However, the telephone configured as described above also has the following problems. In other words, if a power outage occurs to the 100V commercial power supply during a call while the user is making a call with the card inserted into the card slot, the call line will be forced to close even if a coin has been inserted into the coin slot. The coin is returned from the coin return slot at the same time as the card is returned from the card return slot. Therefore,
The user must insert the coin into the coin slot again and perform the dial operation from the beginning.

In this way, if a power outage occurs during a call using a card, the call line will be cut off, and the call must be dialed from the beginning in order to be able to continue, which is very inconvenient for the user. .

The present invention was developed based on these circumstances, and its purpose is to allow coin-based calls to be resumed without interrupting the current call if there is a power outage in the commercial power supply during a card-based call. To provide a power supply control device for a telephone that can continue a call even in the event of a power outage accident and improve service to users by automatically switching.

[Means for solving problems]

The power supply control device for a telephone according to the present invention includes a signal transmitting/receiving section for transmitting and receiving data to and from a telephone office, a communication circuit for controlling this signal transmitting/receiving section, a card trust mechanism, a coin processing mechanism, and a commercial power supply, In a telephone equipped with a telephone call circuit and a power supply circuit that outputs a driving voltage to drive a card processing mechanism, charging is performed by a line current flowing through a signal line connected to a central telephone office in response to an operation of picking up the handset. A power outage detection circuit for detecting a power outage in the commercial power supply is inserted into a driving voltage supply path for the communication circuit, and when the power outage detection circuit detects a power outage, the driving voltage supply source for the communication circuit is charged from the power supply circuit. A switching circuit for switching connection to the circuit, and a talkable time control switching means provided in the call circuit and switching the remaining talkable time control from the card processing mechanism to the coin processing mechanism when power outage information is received from the power supply circuit. It is something that

[Effect]

With a telephone power supply control device configured in this way, if a power outage occurs in the commercial power supply during a call using a card, the drive voltage from the power supply circuit to the card processing mechanism and the call circuit is cut off. At the same time, the driving voltage supply source for the communication circuit is switched from the power supply circuit to the charging circuit. Therefore, if a coin has been inserted into the coin slot before a power outage occurs, the charging circuit will be charged by the line current flowing through the signal line, so even after a power outage occurs, driving voltage will not be supplied to the communication circuit. will continue. Therefore, the call continues with coins.

〔Example〕

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

The figure is a circuit diagram showing a schematic configuration of a power supply control device for a telephone according to an embodiment. That is, one end of the pair of signal lines 1a, 1b is connected to the telephone exchange through the input terminals L1, L2, and the other end is controlled by a communication circuit 2 formed by an MPU (micro computer unit). of the signal transmitting/receiving section 3
Connected to AO and BO terminals. One of the signal lines 1a is connected to a contact 4a of a switch which is connected to the operation of picking up the handset, and one contact 5a of a relay 5 which is driven and controlled by the communication circuit 2. Furthermore, the other contact 5b of the relay 5 is connected between both terminals of the contact 4a of the switch.

A receiving circuit 6 is inserted between the normally closed terminal of the contact 5b of the relay 5 and the other signal line 1b, and receives a calling signal from the telephone office and sends an incoming signal to the calling circuit 2. Further, the normally closed terminal of the other contact 5a of the relay 5 is connected to the A1 terminal of the signal transmitting/receiving section 3 via a thyristor 7 with the polarity shown, and is connected to the signal transmitting/receiving section via a charging circuit consisting of a Zener diode 8 and a capacitor 9. It is connected to the B1 terminal of 3.

A coin contact 11 and a resistor 12 incorporated in a coin processing mechanism 10 are connected between the anode terminal and gate terminal of the thyristor 7. moreover,
A resistor 13 is connected between the gate terminal and cathode terminal of the thyristor 7. In addition, coin contact 1
An emergency call switch 14 is connected between both terminals of the thyristor 7, which is turned on when making a free emergency call to a police station or fire department.
An auxiliary switch 15 is inserted between the anode terminal and the cathode terminal of the telephone, which is inserted by the owner of the telephone when making a paid call without using coins or cards.

In addition, 16 in the figure is an AC 10 (not shown) via a power switch 17 and input terminals AC1, AC2.
This is a power supply circuit connected to the OV's commercial power supply, converting 100V AC to 24V and 5V. A relay 18 serving as a power failure detection circuit is inserted between a pair of output terminals VD1 and G of the power supply circuit 16 that output a 24 V DC drive voltage.
The output terminals VD1 and G are the card processing mechanism 1 which reads the call rate of the card inserted into the card insertion slot and writes the remaining call rate at the end of the call.
It is connected to the drive voltage input terminal VD1, G of 9.
On the other hand, a pair of output terminals VD2 and G that output a DC 5V driving voltage are input terminals of the card processing mechanism 19.
It is connected to VD2, G, and also to drive voltage input terminals VC, G of the communication circuit 2 via respective contacts 18a, 18b of a relay 18 as a switching circuit. Note that the output terminal of the power supply circuit 16
A protective resistor 20 is inserted between VD2 and the common terminal of the contact 18a to control excessive current when the 5V DC drive voltage output from the power supply circuit 16 is applied to the communication circuit 2. ing. Further, a smoothing capacitor 21 is connected between the drive voltage input terminals VC and G of the communication circuit 2. The normally closed terminal of the contact 18a of the relay 18 is connected to the protective resistor 22.
The normally closed terminal of the contact 18b is connected to the (-) side terminal of the capacitor 9 of the charging circuit consisting of the Zener diode 8 and the capacitor 9.

In addition, the DC 5V output terminal of the power supply circuit 16
A card usable lamp 23 is connected to VC,
This card usable lamp 23 is controlled to be turned on by the card processing mechanism 19. In addition, power switch 1
7 is turned on, the power supply circuit 16 outputs the output terminal
A DC 5V driving voltage is constantly sent from the VC to the card usable lamp 23 and the power supply control circuit 24. The power supply control circuit 24 sends a drive signal to the control terminal C of the power supply circuit 16 when the other contact 4b of the switch is closed. Further, the card processing mechanism 19 sends the number of calls read from the card to the call circuit 2 via the signal transmitting/receiving circuit 25, and writes the remaining number of calls input from the call circuit 2 via the signal transmitting/receiving circuit 25 into the card. .

In the coin processing mechanism 10, a coin inserted from the coin input port passes through the coin contact point 11 provided directly below the coin input port on a coin track connecting the coin input port and the coin storage mechanism 26.
After the coins are momentarily closed by their own weight, the number of coins inserted is counted by the insertion sensor 27 installed along the coin trajectory, and the storage sensor 28 installed in front of the coin storage mechanism 26 closes the coin insertion slot. The number of coins that have been inserted since then and have not yet been stored in the coin storage mechanism 26 is counted. Further, the storage sensor 29 confirms that the coin is correctly stored in the coin storage mechanism 26.

In addition, the telephone call circuit 2 receives various information from the coin processing mechanism 10, inputs dial number information from the dial button switch 30, and sends display data to a remaining number display 31 that displays the remaining number of calls on the card. do. Further, the relay 5 is controlled via a relay drive circuit 32. In addition, contact information of a contact 4c of a hook switch, a contact 14a linked to the emergency call switch 14, and a contact 15a linked to the auxiliary switch 15 are input to the call circuit 2. Furthermore, power outage information is inputted to the communication circuit 2 from the power supply circuit 16, and a drive control signal is sent to the power supply control circuit 24.

Further, the telephone call circuit 2 sends the dial number input from the dial switch 30 to the dial oscillator 33 to convert it into a dial pulse signal. Also, a signal is sent to the reminder sound circuit 34 when the number of calls read from the card processing mechanism 19 during a call or the accumulated coins detected by the accumulation sensor 28 of the coin processing mechanism 10 are exhausted before a certain grace period. to output a reminder sound signal.

The signal transmitting/receiving section 3 transmits the dial pulse signal sent from the dial oscillator 33 to the signal line 1a,
1b, a dialing signal sending circuit 35 which is built into the handset and which outputs the reminder tone signal and the answering signal and converts the sending voice into the sending signal, and a dialing signal sending circuit 36 which sends out the call signal to the phone 1b; The BT control circuit 37 is designed to cut off the call circuit when the call line runs out and make the user hear a busy tone indicating that the call line has been cut off, and the type of coin stored in the coin storage mechanism 26.
A 16KHz circuit 38 that changes the sending time interval of the Hz signal and reports it to the telephone exchange, and a billing signal receiving circuit 3 that receives the billing signal sent from the telephone exchange.
It consists of 9. And each circuit 37, 3
The operations of 8 and 39 are controlled by the communication circuit 2, respectively.

The operation of the telephone power supply control device configured as described above will be explained. First, when the power switch 17 of the 100V commercial power source is not turned on, AC power is not supplied to the power supply circuit 16, so the output terminals VD1, G and VD2,
No drive voltage is output from G. Therefore, since the relay 18 as a power failure detection circuit does not operate, the contacts 18a and 18 of the relay as a switching circuit do not operate.
b remains connected to the normally closed terminal side. on the other hand,
If the handset is not picked up in this state, the contacts 4a, 4b, 4c of the touch switch remain open. Further, since the communication circuit 2 is in a non-operational state, the relay 5 is also not operated. Therefore, contacts 5a and 5b of relay 5 are connected to the normally closed terminal side. As a result, the line current flowing through the signal lines 1a and 1b is cut off at the contact 4a and does not flow into the thyristor 7 or the signal transmitting/receiving section 3.

Next, when you pick up the handset in this state and insert a coin into the coin slot, the contacts 4a, 4b, 4c of the hook switch are closed, and the coin contact 11 of the coin processing mechanism 10 is closed for a very short time. . Therefore, it consists of the input terminal L1, the signal line 1a, the contacts 4a and 5a, the coin contact 11, the resistors 12 and 13, the Zener diode 8, the B1 terminal and B0 terminal of the signal transmitting/receiving section 3, the signal line 1b, and the input terminal L2. A direct current circuit is formed. Therefore, a line current flows into the gate terminal of the thyristor 7 via the coin contact 11 and the resistor 12.
As a result, the thyristor 7 becomes conductive.

When the thyristor 7 becomes conductive, the input terminal L1, the signal line 1a, the contacts 4a and 5a, the thyristor 7, the Zener diode 8, the B1 terminal of the signal transmitting/receiving section 3,
A DC current supply path consisting of the B0 terminal, the signal line 1b, and the input terminal L2 is formed. Note that once the thyristor 7 is made conductive, even if the coin contact 11
Even if the line is opened, it will not be cut off unless the line current becomes zero.

Therefore, the charging circuit consisting of the Zener diode 8 and the capacitor 9 starts charging. and,
When the voltage between the terminals of the capacitor 9 rises to a specified voltage of approximately 5V determined by the Zener voltage of the Zener diode 8, the drive voltage input terminals VC2, G of the communication circuit 2 rise to the specified 5V via contacts 18a, 18b. Then, this communication circuit 2 starts operating. When the operation starts, first, the contact 4c of the switch is closed, and after confirming that the coins required for the call have been inserted, the relay drive circuit 3 is closed.
2 to drive relay 5. When the relay 5 is driven, each contact 5a, 5b of the relay 5 is connected to the normally open terminal side. As a result, the input terminal L1, signal line 1a, contact 4a (contact 5b), contact 5a, A0 terminal, A1 terminal of signal transmitting and receiving section 3, Zener diode 8, B1 terminal of signal transmitting and receiving section 3, BO terminal, signal line 1b , and input terminal L2, a DC current supply path is formed. Therefore, the capacitor 9 is continuously charged with the specified voltage. However,
When a call dialing operation is performed using the dial switch 30 in this state, a dial pulse signal is sent out from the dial signal sending circuit 35 of the signal transmitting/receiving section 3. Then, it becomes possible to communicate with the other party via the transmitting/receiving circuit 36. When a call starts, one coin accumulated in the coin orbit is transferred to the coin storage mechanism 2.
At the same time, information on the type of coin inserted is sent to the telephone exchange via the 16KHz circuit 38.
Each time a billing signal with a pulse interval corresponding to the communication distance is input from the exchange to the billing signal receiving circuit 39, the coins accumulated in the coin orbit are stored one by one in the coin storage mechanism 26.

Next, when you put down the handset, the contacts 4a, 4b, and 4c of the switch are opened, so
The communication circuit 2 confirms that the contact 4c is open and returns the relay 5 to its original state. Then, since each contact 5a, 5b of the relay 5 is connected to the normally closed terminal side, the line current is cut off at the contact 4a. The communication circuit is therefore cut off. At the same time, coins not yet stored in the coin storage mechanism 26 within the coin orbit of the coin processing mechanism 10 are discharged to the coin return port.

Also, if the number of coins detected by the storage sensor 28 during a call becomes one, and the remaining talk time using this coin falls below a certain grace period,
The telephone call circuit 2 sends a reminder sound signal to the transmitting/receiving circuit 36 via the reminder sound circuit 34. If no additional coin is inserted within the remaining time, the relay 5 is returned to its original position and the contacts 5a and 5b are connected to the normally closed terminal. As a result, the telephone line is cut off. At the same time, a signal is sent to the BT control circuit 37 to generate a busy sound indicating that the telephone line has been forcibly cut off.

In this way, the signal line 1 can be connected without using commercial power.
It is possible to make a telephone call using coins using the line current flowing through a and 1b.

Next, when the power switch 17 is turned on, the power supply circuit 16 is activated and a driving voltage of 5V is output from the output terminal VC. As a result, the card usable lamp 23 lights up and the power supply control circuit 24
becomes operational. When the handset is picked up in this state, the contacts 4a, 4b, and 4c of the switch are closed, so the power supply control circuit 24 confirms that the contact 4b is closed and then connects the control terminal C of the power supply circuit 16. Sends a drive signal to. Then, the output terminal VD of the power supply circuit 16
A driving voltage is sent from 1,G and VD2,G. As a result, the relay 18 operates, and the contacts 18a, 18b of the relay 18 are connected to the normally open terminal side. Therefore, a prescribed driving voltage is applied to the card processing mechanism 19 and the communication circuit 2 from the power supply circuit 16. Then, when a card is inserted into the card insertion slot or a coin is inserted into the coin insertion slot, the number of calls is input from the card processing mechanism 19 to the communication circuit 2, or the insertion sensor 27 and the accumulation sensor 28 of the coin processing mechanism 10 are input. Information on the amount of coins deposited is input. The call circuit 2 temporarily stores the input call frequency and amount information in an internal memory, and drives the relay 5.
Each contact 5a, 5b is connected to the normally open terminal side. Thus, the input terminal L1, the contact 4a (contact 5b), the contact 5a, the AO terminal of the signal transmitting and receiving section 3, the A1 terminal, the Zener diode 8, the B1 terminal of the signal transmitting and receiving section 3,
A current supply path, ie, a speech line, is formed by the B0 terminal, the signal line 1b, and the input terminal L2. Therefore, by dialing the dial switch 30, a call can be started with the other party.

When a call is started, if both a card and a coin are inserted or inserted, the call frequency of the card is first subtracted. When the stored number of calls for the card runs out, the system automatically switches to coin-based calls. This transition process is automatically executed within the communication circuit 2. Therefore, since the power supply circuit 16 continues to operate, the contact 18
a, 18b are never switched to the normally closed terminal side.

When the call ends and the handset is put down, the contacts 4a, 4b, and 4c of the switch are opened, so that the power supply circuit 16 is disconnected from the power supply control circuit 26.
A drive control signal is sent to the control terminal C of the output terminal C, and the output voltages from the output terminals VD1, G and VD2, G become zero. As a result, the relay 18 returns to its original state and each contact 18a, 18b is connected to the normally closed terminal side.
The communication circuit 2 also has a contact 14a of a switch.
Detecting the open state of the relay 5, the relay 5 is returned to its original state, and the contacts 5a and 5b are connected to the normally closed terminal side. Therefore, the telephone line is cut off.

Furthermore, if an AC power outage occurs during a call with a card inserted and a coin inserted, and the card's call rate is high, and the voltage drops to the specified voltage, a voltage drop in the power supply circuit 16 is detected. When the function is activated, this power supply circuit 16
Power outage information that foretells a power outage is sent to the communication circuit 2 from the terminal. Then, when the call circuit 2 receives this power outage information, it sends the call frequency at that time to the card processing mechanism 19 via the transmission signal transmission/reception circuit 25, and causes the remaining call frequency to be written on the card.
Eject the card. At the same time, the remaining talkable time control is switched to control based on the coin-based talkable time of the coin processing mechanism 10.

When the voltage further decreases from the specified voltage to below the limit voltage, a complete power outage occurs and the output voltage of the power supply circuit 16 is completely cut off. As a result, the relay 18 as a power failure detection circuit is de-energized, the relay 18 returns to its original state, and the contacts 18a, 18b are connected to the normally closed terminal.
Then, the card usable lamp 23 is turned off.

On the other hand, during the call period, as described above, the charging circuit consisting of the Zener diode 8 and the capacitor 9 is constantly charged to a specified voltage by the line current input from the input terminals L1 and L2. Therefore, at the point when the contacts 18a and 18b are switched to the normally closed terminal side, the driving voltage supply source of the communication circuit 2 is switched from the power supply circuit 16 to the charging circuit. the result,
The communication circuit 2 can continue to operate as is.

In addition, if a power outage occurs during the call period after the call based on the card call rate ends and the call is automatically switched to the coin call, the contacts 18a and 18b of the relay 18 will be switched to the normally closed terminal side. You can continue the call as it is.

Furthermore, if a power outage occurs before the user picks up the handset, the card usable lamp 23 will go out, allowing the user to confirm that only coins can be used. In this case, the coin communication is the same as the operation before the power switch 17 is turned on as described above.

In this way, even if an AC power outage occurs during a call, the driving voltage source of the call circuit 2 is automatically switched from the power supply circuit 16 to the charging circuit that is charged with line current, so the call line remains intact. You can continue calling using coins without being interrupted. Therefore, it is very convenient for the user because even if a power outage occurs, there is no need to perform dial operations again.

Note that the present invention is not limited to the embodiments described above. In the embodiment, the power failure detection circuit and the switching circuit are each constructed of the relay 18 and the contacts 18a and 18b of the relay, but the power failure detection circuit and the switching circuit may be formed using semiconductor elements other than the relay.

[Effect of idea]

As explained above, according to the present invention, if there is a power outage in the commercial power supply during a call using a card, the call is automatically switched to a call using coins without interrupting the current call. Therefore,
To provide a telephone that can continue a call even if a power outage occurs, and can improve service to users.

[Brief explanation of drawings]

The figure is a circuit diagram showing a power supply control device for a telephone according to an embodiment of the present invention. 1a, 1b...Signal line, 2...Telephone circuit, 3...
... Signal transmitting and receiving unit, 4a, 4b, 4c... Hook switch contact, 5... Relay, 7... Thyristor, 8... Zener diode, 9... Capacitor, 10... Coin processing mechanism, 11... Coin contact, 16...Power supply circuit, 17...Power switch, 18...Relay (power failure detection circuit), 18a,
18b... Relay contact (switching circuit), 19...
Card processing mechanism, card ready lamp.

Claims (1)

[Scope of utility model registration request] Signal transmitting/receiving unit 3 that performs transmission and reception to and from the telephone office
and a telephone call circuit 2 that controls the operation of each circuit in the signal transmitting/receiving section; and a telephone call circuit 2 that reads the number of calls recorded on the telephone card inserted through the card insertion slot and sends it to the telephone circuit; a card processing mechanism 19 that writes the remaining call count sent out from the telephone card on the telephone card and discharges the card; a coin processing mechanism 10 that detects coins and stores them in response to a storage command from the communication circuit; a power supply circuit 16 that is connected to a commercial power source and outputs a driving voltage for driving the communication circuit and the card processing mechanism; Charging circuits 8 and 9 that are charged by line power flowing through a signal line connected to the telephone office in response to an operation of picking up the handset, a power outage detection circuit 18 that detects a power outage of the commercial power supply, and the telephone call circuit. switching circuits 18a and 18b that are inserted in the drive voltage supply path for the communication circuit and switch and connect the drive voltage supply source of the communication circuit from the power supply circuit to the charging circuit when the power failure detection circuit detects a power failure;
and a talkable time control switching means provided in the telephone call circuit, which switches the remaining talkable time control from the card processing mechanism to the coin processing mechanism upon receiving power outage information from the power supply circuit. Features: Telephone power supply control device.