JP2000270094A - Cordless telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform a telephone call for many hours even in case of a power failure by charging the main power source of a slave device side by the backup power source of a master device side. SOLUTION: A controller 50 on the side of the subordinate device 16 detects the rest of the rechargeable main power source 56 and outputs a charging request to the master device 14 when the rest decreases to or below 3.4 V. A controller 26 on the side of the master device 14 turns on a switch 36 at the charging request in case of a power failure to connect the backup power source 34 to a charging circuit 38. Consequently, when the slave device 16 is mounted on the master device 14, the main power source 56 is charged by the backup power source 34.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone, and more particularly to, for example, a base unit having a backup power supply.
The present invention relates to a cordless telephone in which a child device has a rechargeable main power supply.

[0002]

2. Description of the Related Art In a conventional cordless telephone of this kind,
The slave unit is driven by a rechargeable main power supply, and when the slave unit is mounted on the master unit, the main power source is charged by the master unit. On the other hand, the master unit is driven by a commercial power supply in a steady state, and is driven by a backup power supply when a power failure occurs.

[0003]

However, in the prior art, the backup power is supplied only to the master unit when a power failure occurs. That is, even if the backup power has enough power to drive not only the master but also the slave, the backup power is supplied only to the master. As a result, even if sufficient power remains in the backup power supply, the telephone cannot be talked when the main power supply of the slave unit falls below a predetermined value.

[0004] Therefore, a main object of the present invention is to provide a cordless telephone capable of making a telephone call as long as possible even during a power failure.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a cordless telephone comprising a master unit and a slave unit, the slave unit includes a rechargeable main power supply, a first detection means for detecting the remaining amount of the main power supply, and (1) a charging request output unit that outputs a charging request to a base unit in accordance with a detection result of the detection unit; A cordless telephone comprising activation means for activating a supply means in response to a request.

[0006]

The remaining amount of the rechargeable main power supply provided in the slave unit is detected by the first detecting means. The charging request output means outputs a charging request to the master unit according to the detection result of the first detecting means. In the base unit, the activation unit activates the supply unit in response to the charging request. The backup power supply activated at the time of the power failure is supplied to the slave unit by such a supply unit.

[0007] In one embodiment of the present invention, the charging request output means of the slave unit outputs a charging request every predetermined period.

[0008] In one aspect of the present invention, the charging prohibition request output means is provided in the slave unit, and the charging prohibition request output means outputs a charging prohibition request to the parent device in accordance with the detection result of the first detection means. In the master unit, the first disabling means disables the supply means in response to the charging prohibition request.

[0009] In another aspect of the present invention, in the base unit,
Second detection means detects the remaining amount of the backup power supply. The second disabling means disables the supply means according to the detection result of the second detecting means.

In another aspect of the present invention, the supply means supplies backup power when the power output terminal of the master unit and the power input terminal of the slave unit are connected to each other.

[0011]

According to the present invention, the backup power of the master unit is supplied to the slave unit in response to the charging request from the slave unit, so that it is possible to talk for as long as possible even during a power failure.

The above objects, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

[0013]

Referring to FIG. 1, a cordless telephone 10 of this embodiment comprises a master unit 14 and a slave unit 16. Base unit 1
4 includes an incoming call detection circuit 13 connected to the telephone line 12. The incoming call detection circuit 13 sends a detection signal to the controller 26 when there is an incoming call request from the other party. Controller 26 outputs a ring tone generation request to handset 16 in response to the detection signal. The ring tone generation request is sent to the radio circuit 22.
And transmitted to the slave unit 16 through the antenna 24. In the slave unit 16, the ring tone generation request is received by the antenna 40, and the received ring tone generation request is transmitted to the wireless circuit 42.
Is given to the controller 50 via the. When the ring tone generation request is input, the controller 50 gives the ring tone signal to the speaker 46 through the baseband processing circuit 44. As a result, a ringtone is output from the speaker 46.

When an operator operates an incoming key (not shown) on the operation panel 52 in response to the ring tone, the controller 50 outputs an incoming request to the base unit 14. The incoming call request is sent to the wireless processing circuit 42, the antenna 40,
The signal is supplied to a controller 26 via an antenna 24 and a wireless processing circuit 22. The controller 26 controls the hook control circuit 18 in response to the incoming call request, and connects the telephone line 12 to the baseband processing circuit 20. As a result, the audio signal of the other party is processed by the baseband processing circuit 20, and the processed audio signal is transmitted to the slave unit 16 via the wireless processing circuit 22 and the antenna 24. Handset 16 receives this audio signal via antenna 40. The received audio signal is provided to the speaker 46 via the wireless processing circuit 42 and the baseband processing circuit 44, and as a result, the voice of the other party is output from the speaker.

The voice of the operator is captured by the microphone 48, and the captured voice signal is transmitted to the base unit 14 in the same manner as described above. Then, it is transmitted to the other party through the wireless processing circuit 22, the baseband processing circuit 20, the hook control circuit 18, and the telephone line 12.

On the other hand, when the operator inputs a desired telephone number using the operation panel 52, the controller 50
A transmission request including the telephone number information is transmitted to base unit 14 through antenna 40. In the base unit 14, the controller 26 receives the transmission request, and performs transmission processing according to the transmission request. As a result, if there is a response from the other party, the call is made in the same manner as described above. The audio signal transmitted from the other party is provided to the baseband processing circuit 20 via the hook control circuit 18. Baseband processing circuit 20
Performs predetermined processing on the input audio signal, and outputs the processed audio signal to the wireless processing circuit 22 and the antenna 24.
Is transmitted to the slave unit 24 through In the child device 16, the antenna 40 receives the audio signal from the parent device 24, and the received audio signal is input to the baseband processing circuit 44 via the wireless processing circuit 42. The baseband processing circuit 44 performs predetermined processing on the input audio signal, and then supplies the processed audio signal to the speaker 46. As a result, the voice of the other party is output from the speaker 46.

On the other hand, the audio signal of the user input from the microphone 48 is transmitted to the baseband processing circuit 44 and the radio processing circuit 4.
2 and the base unit 14 via the antenna 40.
The transmitted audio signal is received by the antenna 24,
The received audio signal is provided to the baseband processing circuit 20 via the wireless processing circuit 22. The baseband processing circuit 20 performs predetermined processing on the input audio signal, and supplies the processed audio signal to the telephone line 12 via the hook control circuit 18. As a result, the audio signal input through the handset 40 is transmitted to the other party.

When power is supplied from an AC power supply,
The controller 26 is driven by the DC power output from the rectifier circuit 30. On the other hand, when power supply from the AC power supply is stopped due to a power failure, the controller 26 is driven by the backup power supply 34. The controller 26 also recognizes the occurrence of a power failure based on the output of the power failure detection circuit 28. That is, the power failure detection circuit 28 outputs a low-level detection signal when power is supplied and a high-level detection signal when power is lost. Therefore, the controller 26
Recognizes the occurrence of a power failure from the level of such a detection signal.

When a power failure occurs, the controller 26
6 based on the charging request and charging prohibiting request provided through the antenna 24 and the voltage of the backup power supply provided through the A / D converter 32.
Turn on / off. Specifically, when a charging request is given from the slave unit 14, the controller 26 detects the voltage of the backup power supply 34, and turns on the switch 36 if the voltage is equal to or higher than 4.5V. This allows the backup power supply 3
4 is supplied to the charging circuit 38. Therefore, if the child device 16 is mounted on the parent device 14, the output of the charging circuit 38 is supplied to the rechargeable main power supply 56 of the child device 14 through the terminals S1 to S4. As a result, the main power supply 56 is charged. Thereafter, when a charging prohibition request is given from the child device 14, the controller 26 turns off the switch 36.
As a result, charging is stopped.

If the voltage of the backup power supply 34 does not reach 4.5 V even if a charging request is given from the slave unit 14, the controller 26 turns off the switch 36. That is, if the voltage of the backup power supply 34 is insufficient,
The power supply to the child device 14 is stopped in order to give priority to the power supply to the parent device 14 itself.

The controller 50 provided in the slave unit 16
Is a main power supply 5 supplied through an A / D converter 54.
The charge request or the charge prohibition request is output to the base unit 14 in accordance with the voltage of No. 6. That is, when the voltage of the main power supply 56 is 3.
When the voltage falls below 4 V, a charging request is output every predetermined period, and when the voltage exceeds 3.5 V due to charging from the base unit 14, a charging prohibition request is output. Thus, the controller 50 monitors only the voltage of the main power supply 56 and outputs a desired request.

The controller 26 specifically processes the flowcharts shown in FIGS. The controller 26 first performs an initialization process in step S1, and then determines in step S3 whether an incoming call request has been input. If YES, an incoming call process is performed in step S5, and then a call process is performed in step S11. On the other hand, when the transmission request is input, the controller 26 determines in step S7 that Y
It is determined to be ES, and transmission processing is performed in step S9. Then, a call process is performed in step S11. If NO is determined in the step S7 or the process in the step S11 is completed, the controller 26 performs a power control process in a step S13, and thereafter returns to the step S3.

The controller 26 processes a subroutine shown in FIG. 3 in step S13. First, in step S1301, the presence or absence of a power failure is determined from the output of the power failure detection circuit 28. If the power is on here, the controller 2
6 directly returns to the main routine. On the other hand, if the power is out, the controller 26 proceeds to step S1303, and determines whether or not a charging request has been input from the slave unit 16. If a charge request is input, the controller 26 detects the voltage of the backup power supply 34 in step S1305, and furthermore, this voltage is 4.5V in step S1307.
It is determined whether it is the above. Backup power supply 34
Is greater than or equal to 4.5 V, the switch 36 is turned on in step S1309, and the process returns to the main routine. On the other hand, when the voltage of the backup power supply 34 is 4.
If it is less than 5 V, the switch 36 is selected in step S1311.
Is turned off, and the process returns to the main routine.

If the input from handset 16 is a charge prohibition request, controller 26 determines YES in step S1313.
Is determined, the switch 36 is turned off in step S1315, and the process returns to the main routine. If neither the charging request nor the charging prohibition request is input from the child device 16, the controller 26 returns to the main routine as it is.

The controller 50 specifically processes the flowcharts shown in FIGS. The controller 50 first determines whether or not a request for generating a ring tone has been input from the base unit 14 in step S21.
At 23, an incoming call process is executed. Thereafter, if the operator performs an incoming call operation, the controller 50 determines in step S25 that Y
It is determined to be ES, and the communication process is executed in step S31, and then the process proceeds to step S33. On the other hand, if the operator performs an outgoing call operation in a state where a ring tone generation request has not been input from the base unit 14, the controller 50 executes an outgoing call process in step S29, and executes a call process in step S31.
Then, the process proceeds to step S33. If no ring tone generation request is input from master device 14 and there is no outgoing call operation by the operator, controller 50 proceeds directly to step S33. In step S33, the controller 50
Is processed, and the process returns to step S21.

Referring to FIG. 5, controller 50 first detects the voltage of main power supply 56 in step S1301.
Next, in step S3303, it is determined whether this voltage is equal to or lower than 3.4V. If YES here, the controller 50 determines whether or not the value of the counter 50a has reached a predetermined value. If NO, step S33
At 07, the counter 50a is incremented, and the process returns to the main routine. On the other hand, if YES in step S3305, controller 50 resets counter 50a in step S3309, transmits a charge request to base unit 14 in step S3311, and returns to the main routine.

If NO is determined in the step S3303, the controller 50 proceeds to a step S3313, and determines whether or not the voltage detected in the step S3301 is equal to or more than 3.5V. If NO, the process directly returns to the main routine. If YES, a charge prohibition request is transmitted to the base unit 14 in step S3315, and then the process returns to the main routine.

As described above, the controller 50 of the slave unit 16 detects the remaining amount of the rechargeable main power supply 56 and outputs a charging request to the master unit 14 when the remaining amount becomes 3.4 V or less. I do. The controller 26 of the parent device 14 turns on the switch 36 in response to such a charging request at the time of a power failure, and connects the backup power supply 34 to the charging circuit 38. Therefore, when the slave unit 16 is mounted on the master unit 14, the main power supply 56 is charged by the backup power supply 34. Therefore, it is possible to talk for as long as possible even during a power failure.

In this embodiment, both the charging request and the charging prohibition request are transmitted to the base unit 14 by radio, but the backup power supply 34 is available only when the slave unit 16 is attached to the base unit 14. Therefore, these requests may be transmitted to the base unit 14 by wire.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a flowchart showing a part of the operation of the master unit.

FIG. 3 is a flowchart showing another part of the operation of the master unit.

FIG. 4 is a flowchart showing a part of the operation of the slave unit.

FIG. 5 is a flowchart showing another part of the operation of the slave unit.

[Explanation of symbols]

 10 cordless telephone 14 parent device 16 child device 26, 50 controller 34 backup power supply 56 rechargeable main power supply

Claims (5)

[Claims] 1. A cordless telephone comprising a master unit and a slave unit, wherein the slave unit is a rechargeable main power supply, first detection means for detecting a remaining amount of the main power supply, and detection of the first detection means. A charging request output unit that outputs a charging request to the master device according to a result, wherein the master device is a backup power supply that is enabled at the time of a power failure,
Supply means for supplying the backup power supply to the slave unit,
And a activating means for activating the supply means in response to the charging request. 2. The cordless telephone according to claim 1, wherein said charging request output means outputs said charging request at predetermined intervals. 3. The slave unit further includes a charge inhibition request output unit that outputs a charge inhibition request to the master unit according to a detection result of the first detection unit, and the master unit responds to the charge inhibition request. 3. The cordless telephone according to claim 1, further comprising a first disabling means for disabling the supply means. 4. The master unit further comprises a second detecting means for detecting a remaining amount of the backup power supply, and a second disabling means for disabling the supply means in accordance with a detection result of the second detecting means. The cordless telephone according to any one of claims 1 to 3, comprising: 5. The master unit further includes a power output terminal, the slave unit further includes a power input terminal, and the supply unit includes the backup when the power output terminal and the power input terminal are connected to each other. The cordless telephone according to any one of claims 1 to 4, which supplies power.