JPH089953Y2 - Telephone - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a telephone having a power save circuit for preventing unnecessary power consumption of a dialer.

[Conventional technology]

Conventionally, in the case of IC-based telephones, in order to receive a key input from the keyboard and generate a selection signal, a memory is installed inside the dialer to store programs and fixed data. It is built in the board to back up the memory to prevent data loss.

FIG. 2 shows the configuration of a conventional telephone circuit that has been integrated into an IC. The line input section is provided with line terminals 2a and 2b for receiving the line voltage V _L and the line current I _L, and the line terminals 2a and 2b are connected via a switch 8 which interlocks with a hook switch 6 attached to the dialer 4. The bridge rectifier circuit 10 is connected.
The dialer 4 is internally provided with a key input circuit and a memory, and after the hook switch 6 is operated, a dial pulse DP or a tone selection signal (DTMF signal), a key confirmation signal AT, and a key confirmation signal AT are input according to the dial input from the keyboard 12. Mute signal MU
Generate TE etc. Except for the dial pulse DP, the DTMF signal, the key confirmation signal AT and the mute signal MUTE are applied to the speech network 14.

The rectified output of the bridge rectifier circuit 10 is applied to the speech network 14 through the transistor 16 and is also applied as a power source to the dialer 4 through the resistor 18 and the diode 20. Transistor 16
A transistor 22 as a driver is provided at the base of the resistor 24
A rectified output is added as a bias input to the base of the transistor 22 via a resistor 26. Since the dial pulse DP is applied to the base of the transistor 22 from the dialer 4, the transistor 22 is controlled to be conductive in the high (H) level section of the dial pulse DP and non-conductive in the low (L) level section. . The switching operation of the transistor 16 is performed by the switching of the transistor 22 by the dial pulse DP, and the dial pulse DP is transmitted through the line terminals 2a and 2b.

And, on the cathode side of the diode 20, a capacitor
28 is connected, a diode switch 30 is connected, and a backup battery 34 is connected between the anode of the diode switch 30 and the ground via a resistor 32. The battery 34 is installed in the substrate at the manufacturing stage of the telephone circuit, and a lithium battery is generally used.

[Problems to be solved by the device]

By the way, when a telephone set to which such a telephone circuit is attached is packaged and transported, the handset is accidentally detached and the hook switch 6 and the switch 8 are brought into conduction (off-hook), and the key of the keyboard 12 is pressed. In this state, the dialer 4 is activated, a current flows from the battery 34 into the dialer 4, the oscillator operates, and the battery 34 may be consumed before the package is opened.

If the battery 34 is exhausted, the initial operation before line connection cannot be performed, and the memory backup will be incomplete.
There is a drawback that the contents stored in the memory are lost and it becomes inoperable.

Therefore, an object of the present invention is to provide a telephone in which the built-in battery is prevented from being consumed even if the handset is accidentally detached and the key is pressed before the line connection.

[Means for solving the problem]

As shown in FIG. 1, the telephone of this invention is a telephone equipped with storage means (redial memory 48, repertoire memory 64) and a backup battery (battery 34) for holding the stored contents of the storage means. A hook switch (6) provided in the telephone body for detecting detachment of the handset; and a power supply provided by the backup battery when the handset is detached from the telephone body built in the telephone body, and , A dialer (4) for outputting dial information by key input from the keyboard (44),
Action detection means (edge detection circuit 36) for detecting the shift of the dialer to the operating state from the potential change caused by the hook switch being detached from the telephone body.
When receiving the detection output of the operation detecting means, a transmission operation is started, power is supplied from the backup battery to generate a clock pulse used for a control operation of the dialer, and the operation is stopped by an operation release signal. An oscillator (50), a timer (42) for receiving the clock pulse generated by the oscillator, and generating a timer output indicating that a certain time has elapsed from the generation of the operation detection output,
Control means for receiving the timer output generated by the timer, supplying power from the backup battery, generating the operation release signal to be applied to the oscillator, stopping the operation of the oscillator, and releasing the operation of the dialer (system) And a control circuit (38) to stop the operation of the dialer when the handset is detached to prevent the backup battery from being consumed.

[Action]

When the handset comes off and the key shifts to the pressed state,
The dialer is activated and an operating current flows through the battery. This transition to the operating state is detected by the operation detecting means, and the detection signal is added to the timer.

The timer detects that a certain period of time has elapsed from the start of the operation of the dialer, and the timer output is added to the operation releasing means as the operation releasing signal.

Therefore, the operation of the dialer is released by the operation releasing means, and the operation released state is maintained until the reset such as when the line is connected, and the consumption of the battery is prevented.

〔Example〕

 FIG. 1 shows an embodiment of a telephone of this invention.

To the dialer 4, a diode switch 30 is connected to the input part of the power-on reset circuit 7 together with a capacitor 28, and a backup battery 34 is connected to the anode of the diode switch 30 via a resistor 32.

The dialer 4 is provided with a hook switch 6 that opens and closes in association with the operation of the handset, and the hook switch 6 has a resistor 3 between the line of the power supply voltage V _DD and the ground.
Connected via 5, and when the handset is installed in the telephone body, it is in non-conduction (on-hook) state, and when the handset is detached from the telephone body, it is in conduction (off-hook) state as shown by the solid line. become. Since the dialer 4 shifts to the operating state when the handset is detached and the hook switch 6 is closed, the dialer 4 detects the opening / closing of the hook switch 6 from the potential change, and the dialer 4 shifts to the operating state. Edge detection circuit as a motion detection means for detecting that
36 are installed. When the hook switch 6 is in an off-hook state, a low potential (L) is input to the edge detection circuit 36 as a potential change accompanying opening and closing of the hook switch 6.
When the hook switch 6 shifts to the on-hook state, a high potential (H) input is applied. The edge detection circuit 36 is
An edge detection circuit V _e is generated which indicates the switching time point from L input to H input or from H input to L input.

The output of the edge detection circuit 36 is applied to the reset input R of the timer 42 through the OR circuit 40 together with the key control signal CK ₁ from the system control circuit 38.

By the way, the dialer 4 is connected with a keyboard 44 for dial input, and when the key is pressed from the keyboard 44, it is applied to the key input signal K _i key input circuit 46. That is, in the dialer 4, when there is a key input from the keyboard 44 after the handset is detached, the dialer 4 becomes in the operating state, and therefore the operation of the oscillator 50 is started based on the detection of the transition to the operating state of the dialer 4. A system control circuit 38 and a key input circuit 46 are used as control means for stopping and releasing the operation of the dialer. The key input circuit 46 arranges the key input signals K _i in time series and outputs them to the redial memory 48 as dial information, and also generates a key-in signal K _j indicating that the key input signal K _i has occurred. This key-in signal K _j is applied to the system control circuit 38,
Generates key control signals CK ₁ and CK ₂ which are operation start signals of the dialer 4 in response to the key-in signal K _j . That is, when the arrival of the key-in signal K _j, the key control signal CK ₁ is H output, the key control signal CK ₂ becomes L output, the advent of the timer signal T _o from the timer 42, the key control signal CK ₁ is L output, The key control signal CK ₂ is inverted to H output.

The timer 42 is composed of a pulse counter or the like, and the edge input signal V _e or the key control signal CK ₁ from the system control circuit 38 is added to the reset input R through the OR circuit 40 to generate any one of the signals V _e. , The clock pulse CL from the oscillator 50 from the time when the H input of CK ₁ is applied.
Timer signal that counts K and measures a specific time, and when the count value reaches a specific value, indicates the elapse of the specific time
T _o occurs.

The oscillator 50 is a means for generating a clock pulse CLK that serves as a reference for the operation of the dialer 4, and a crystal oscillator 52 installed outside the dialer 4 is connected in series with inverters 54 and 56 to form an oscillation loop. The NOR circuit 60 is installed in the oscillation loop as a means for canceling the operation. The output of the inverter 54 in the oscillation loop is added to the NOR circuit 60, and a timer is used as an operation release control input.
42 together with the timer signal T _o of the key control signal CK ₂ has been applied from the system control circuit 38, NOR circuit 60
When the timer signal T _o and the key control signal CK ₂ are both L level, the oscillation loop is placed in active state, when one of the timer signal T _o or key control signal CK ₂ is shifted to H level, the oscillation The loop will be placed in a broken state.

Therefore, when the handset is detached from the telephone body, the hook switch 6 is in the off-hook state, and the keyboard 44 is in the key depressed state, the edge detection circuit 36 outputs the edge detection signal V _e and the system control circuit 38. The key control signals CK ₁ and CK ₂ are output. As a result, the timer 42 is placed in the reset state, L-level timer signal T _o is outputted from the timer 42, applied to the NOR circuit 60. Then, the L level key control signal CK ₂ is applied from the system control circuit 38 to the NOR circuit 60, so that the oscillation loop of the oscillator 50 is activated and the clock pulse CLK is generated. This clock pulse CLK
Is added to the timer 42 and is also added to the system clock generation circuit 62 that controls all the systems of the dialer 4, so that the dialer 4 shifts to the operating state.

The timer 42 counts the clock pulses CLK, after a certain time, eg 3 minutes, the timer signal T _o of H level is obtained from the timer 42. This H level timer signal
If T _o is applied to the NOR circuit 60, an oscillation loop is shifted to the released state, generation of the clock pulse CLK is stopped. In this case, the timer signal T _o is the system control circuit 38
Is added as a control input to the system control circuit
The key control signal CK ₁ from the 38 shifts to the L level, and the key control signal CK ₂ shifts to the H level. The NOR circuit 60 also outputs the L level by the H level key control signal CK ₂ , and the oscillation loop is released. Controlled by the state. Therefore, the oscillation operation is stopped after a specific time, for example, 3 minutes, has elapsed since the handset was detached and the keyboard 44 was in the key input state, so that the operation of the dialer 4 is released. As a result, the current flowing through the battery 34 to the dialer 4 is released,
The battery 34 is used only for the repertoire memory 64 to prevent the loss of stored data and the like.

When the dialer 4 is connected to the telephone line, the normal operation state is established, and the voltage V _DD is supplied based on the line voltage V ₁ from the telephone line instead of the power supply of the battery 34. Therefore, if the handset is removed from the telephone body and any dial is entered from the keyboard 44, the key input signal
K _i is added to the key input circuit 46, and the dial data arranged in time series is added to the redial memory 48. For example, when the speed dial data is stored in the repertoire memory 64, a regular telephone number is read from the repertoire memory 64 based on the speed number added from the keyboard 44 and written in the redial memory 48.
In this case, in the system control circuit 38, a mode input MODE-IN for discriminating between the selection signal output, the pulse mode and the tone signal (DTMF) mode is added together with the opening / closing signal HOOK of the hook switch 6, and the key input circuit 46 The key control signal CK ₃ is output to the redial memory 48 based on the key-in signal K _j from. The redial memory 48 is controlled by the key control signal CK ₃ to read the final output telephone number data or write the latest input telephone number data.

The dial data written in the redial memory 48 is sequentially read by the output control circuit 66 and added to the DTMF output circuit 68 and the pulse output circuit 70. The output control circuit 66 discriminates between the DTMF mode and the pulse mode, and outputs the discrimination output together with the mode display signal MODE-OUT, for example, the mute signal MUTE used for switching the amplifier on the speech network side.

In the DTMF mode, the DTMF output circuit 68 is driven instead of the pulse output circuit 70, and the dial data from the redial memory 48 is output as a DTMF signal. Also,
In the pulse mode, the pulse output circuit 70 is driven instead of the DTMF output circuit 68, and dial data is output as a pulse. In this case, the pulse output circuit 70 is added with a pulse selection signal 20P / 10P for selecting the pulse signal 20PPS or 10PPS suitable for the communication partner telephone, and 20PPS or 10PPS.
PPS pulse output PULSE is output.

In this way, in an IC-equipped telephone, even if the handset is removed and the key is pressed during packaging and transportation,
Since the operation is canceled after the specific time, it is possible to prevent the battery 34 from being exhausted, protect the stored data in the repertoire memory 64, and prevent malfunction after sale. Even if such a power save circuit is attached, if the time until the operation is canceled is about 3 minutes, it does not affect the normal call start operation, and the operation is canceled in the dial input state. Is prohibited, so no inconvenience will occur in a normal call.

[Effect of device]

As described above, according to the present invention, even if the handset is accidentally detached from the telephone body and the key is pressed during packing, transportation, etc., the operation time is limited, so battery consumption is prevented. Therefore, it is possible to prevent the memory of the built-in memory from being lost.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of a telephone of this invention, and FIG. 2 is a circuit diagram showing a conventional telephone circuit. 4 …… Dialer 6 …… Hook switch 34 …… Battery (backup battery) 36 …… Edge detection circuit (motion detection means) 38 …… System control circuit (control means) 42 …… Timer 44 …… Keyboard 48 …… Redial Memory (storage means) 50 …… Oscillator 64 …… Repertoire memory (storage means)

Claims (1)

[Scope of utility model registration request] 1. A telephone having a storage means and a backup battery for holding the stored contents of the storage means, the hook switch being provided in the telephone body to detect detachment of a handset, and the telephone body. When the handset is detached from the telephone body built into the telephone, the dialer is fed with the backup battery and outputs dial information by key input from the keyboard, and the hook switch is detached from the telephone body. An operation detecting means for detecting that the dialer has transitioned to an operating state due to a potential change that occurs, and an oscillation operation is started in response to a detection output of the operation detecting means, and power is supplied from the backup battery to control the dialer. Generate the clock pulse used for
Also, an oscillator that stops operation by an operation release signal, a timer that receives the clock pulse generated by this oscillator and generates a timer output that indicates that a certain time has elapsed from the generation of this operation detection output, and this timer Control means for receiving the generated timer output, being fed by the backup battery, generating the operation release signal to be applied to the oscillator, stopping the operation of the oscillator, and releasing the operation of the dialer. A telephone characterized in that the operation of the dialer when the handset is detached is stopped to prevent the backup battery from being consumed.