JP2862683B2 - Battery status display for cordless telephone - Google Patents

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 a battery status display device of a cordless telephone in which a battery of a slave unit and a remaining capacity of a battery can be displayed on a base unit.

[0002]

2. Description of the Related Art In recent years, the spread of cordless telephones has been remarkable and has become widely used. A cordless telephone eliminates a complicated cord in handling, and its convenience is greatly improved as compared with a conventional telephone. In other words, it is possible to make a call in a free place as long as the radio wave can reach between the master unit and the slave unit, and the degree of freedom of the call place is greatly expanded.

[0003] By the way, a cordless telephone handset requires a power supply to be stored therein due to its nature, and incorporates a primary battery or a secondary battery as a power supply. Although the built-in battery is naturally consumed, its capacity is limited, so that the battery needs to be replaced (for a primary battery) or charged (for a secondary battery). However, the remaining capacity of the battery is invisible, so it is not known when to replace or charge it.
In some cases, the battery became dead and could not be used.

Therefore, in order to prevent such a problem from occurring, a conventional cordless telephone displays a message on the handset side when the battery is almost exhausted, and urges the user to replace or charge the battery. ing.

[0005]

If the dead battery is displayed by, for example, lighting or blinking with an LED or the like, the dead battery warning itself consumes the battery in the slave unit, thereby further accelerating the battery consumption. There was such a problem. For this reason, such a battery-warning warning is cut off in a certain period of time at present.However, when considering the use of a cordless telephone, the user is not always near the cordless handset. Does not always make sense.

Further, in order to issue a warning, it is necessary that the capacity of the built-in battery remains, and there is a problem that even when the built-in battery has been used up, the warning cannot be issued.

[0007] The present invention has been made in view of the above-mentioned circumstances, and its purpose is to display a battery exhaustion or the like of a slave unit on the master unit side so that the user can use up the battery of the slave unit even when the battery runs out. An object of the present invention is to provide a battery status display device of a cordless telephone which can issue a warning to the user.

[0008]

In order to solve the above-mentioned problems, a battery status display device for a cordless telephone according to the present invention comprises a base unit connected to a telephone line, and the base unit connected by a wireless line. In a cordless telephone including a primary battery or a secondary device containing a secondary battery, the secondary device has a voltage detection unit that detects a voltage of a battery incorporated therein,
Provided with a transmitting means for transmitting the detected voltage value data of the voltage detecting means at any Thailand timing which is determined within an arbitrary timing or handset that by the instruction from the base unit to the base-side, The master unit includes a receiving unit that receives the detected voltage value data transmitted by the transmitting unit, and a display unit that displays a use state of the battery based on the detected voltage value data received by the receiving unit, arbitrary timing by an instruction from the master unit is a timing when the count termination of a predetermined time by the timer, any Thailand timing that is determined within the slave unit, the timing at the end of the counting a predetermined time by the timer Or the timing when the slave unit is on-hook, or when the charging of the built-in battery is completed.

[0009]

In the slave unit, the voltage of the internal battery is detected by the voltage detecting means. Then, the detected voltage value data is transmitted to the master unit at an instruction from the master unit or at an arbitrary timing determined inside the slave unit. The instruction from the master unit is counted for a predetermined time by, for example, an interval timer, and is transmitted to the slave unit every time the counting is completed. Also, the arbitrary timing determined inside the slave unit is, for example, counting a certain time by an interval timer,
This is the timing at the end of each count, the last timing (on-hook) when the slave unit is used, and the timing at the completion of charging of the built-in battery.

The master unit analyzes the voltage detection value data transmitted from the slave unit at such a timing, and drives the display unit to display the use state of the battery (for example, to indicate the battery voltage level or the dead battery). Warning, etc.). This allows
It is also possible for the master unit to confirm that the battery of the slave unit has run out. In the master unit, at the various timings described above,
Since the voltage detection value data is sent from the slave unit,
The battery status can be grasped more accurately, and the voltage of the
Since it is not necessary to constantly monitor the detected value, the battery
Is also reduced.

[0011]

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

FIG. 1 is a block diagram showing an electric configuration of a base unit of the cordless telephone of the present invention, and FIG. 2 is a block diagram showing an electric configuration of a sub unit of the cordless telephone of the present invention.

In FIG. 1, an output from a transmitting / receiving antenna 1 is transmitted through a duplexer 2 and a high-frequency amplifier 3 to a first
The output of the first mixer circuit 4 is led to the second mixer circuit 6 via the first intermediate frequency amplifier 5. The output of the local oscillator 12 is guided to the second mixer circuit 6, and the output of the second mixer circuit 6 is guided to the detector 8 via the second intermediate frequency amplifier 7. The output of the detector 8 is guided to a speech network 10 connected to a telephone line 21 via a low-frequency amplifier 9.

A handset 11 containing a microphone and a speaker is bidirectionally connected to the speech network 10. The output of the low-frequency amplifier 9 is guided to a control system 17 including a microcomputer via a data decoding unit 16. An output of an interval timer 18 for counting a predetermined time and an output of a key operation unit 19 having a dial key and the like are led to the control system 17. Is led to.

The output of the speech network 10 and the reference oscillator 1 are connected to the PLL system 14.
5 is output to the first mixer circuit 4 and the high-frequency amplifier 13. The output of the high-frequency amplifier 13 is guided to the transmitting / receiving antenna 1 via the duplexer 2.

In FIG. 2, the output from the transmitting / receiving antenna 31 is guided to a first mixer circuit 34 via a duplexer 32 and a high-frequency amplifier 33, and the output of the first mixer circuit 34 is supplied to a first intermediate frequency amplifier 35. Through the second mixer circuit 36. Also, the second mixer circuit 3
The output of the local oscillator 41 is guided to 6, and the output of the second mixer circuit 36 is guided to the detector 38 via the second intermediate frequency amplifier 37. The output of the detector 38 is guided to a built-in speaker 40 via a low-frequency amplifier 39. The output of the low-frequency amplifier 39 is guided to a control system 46 including a microcomputer via a data decoding unit 45.

An output of an interval timer 47 for counting a predetermined time and an output of a key operation unit 48 provided with a dial key and the like are led to the control system 46. Has been. The output of a voltage detector 49 that detects the voltage of a primary battery or a secondary battery (hereinafter, simply referred to as a battery) 50 is:
It is led to the control system 46 and also to the low battery check indicator 51, and the output of the low battery check indicator 51 is an LED 54.
To drive the LED 54 to light up (or blink)
It is supposed to.

The PLL system 43 includes a microphone 5
2 is guided through the amplifier 53, and the output of the reference oscillator 44 is guided. The output is guided to the first mixer circuit 34 and the high-frequency amplifier 42. The output of the high-frequency amplifier 42 is guided to the transmitting / receiving antenna 31 via the duplexer 32.

Among the above-mentioned components, the transmitting and receiving antennas 1, 31, the duplexers 2, 32, the receiving high-frequency amplifiers 3, 33, the first mixer circuits 4, 34, the first intermediate frequency amplifiers 5, 35, the second Mixer circuits 6, 36, second intermediate frequency amplifiers 7, 37, detectors 8, 38, low frequency amplifier 9,
39, local oscillators 12 and 41, high-frequency amplifiers 13 and 42 for transmission, PLL systems 14 and 43, reference oscillators 15 and 44, and data decoding units 16 and 4.
5. Regarding the operation of the interval timers 18 and 47,
It is almost common to the master unit shown in FIG. 1 and the slave unit shown in FIG. 2, and the carrier frequency (380 MHz band) from the master unit to the slave unit (downlink) and the carrier frequency from the slave unit to the master unit (uplink) The only difference is the carrier frequency (250 MHz band).

The master unit is connected to a telephone line such as a public communication network through a telephone line 21 to exchange voice information. In addition, the speech network 10
Includes a hybrid circuit, and separates and mixes sounds of microphones and speakers, which are components of the handset 11.
Further, when the present telephone is not cordless but is used with the handset 11 of the parent machine, only this part is basically necessary, and the operation is the same as that of a normal telephone. However, in order to simplify the description, a ringer, a return coil, and the like are omitted.

The input and output of the handset 11 are connected to a low-frequency amplifier 9 via a speech network 10 for convenience.
Is connected to the output of the PLL system 14 and the input of the PLL system 14. However, it may be more convenient to directly connect the output of the low-frequency amplifier 9 and the input of the PLL system 14 for the purpose of manufacturing a device. .

Next, the operation of the cordless telephone having the above configuration is described as follows: (1) the operation of a general cordless telephone; and (2) a reply signal from the child device in response to an interrogation signal issued from the parent device. (3) an operation of receiving the voltage detection value data) and displaying the remaining battery power and remaining battery capacity of the slave unit; and (3) an operation of displaying the remaining battery capacity and the remaining battery capacity based on the voltage detection value data of the battery generated from the slave unit. (4) an operation of displaying a battery exhaustion or a remaining battery capacity based on battery voltage detection value data issued from the slave unit at the end of use of the slave unit;
(5) The operation will be described in which the battery is broken or the remaining capacity of the battery is displayed based on the detected voltage data of the battery issued from the slave when the charging of the slave is completed.

(1) Operation of a general cordless telephone.
The voice information sent via the telephone line 21 is input to the PLL system 14 via the speech network 10. PLL system 14 includes a modulation circuit,
The voice information from the telephone line 21 is modulated here, converted into a downlink frequency, amplified by a high-frequency amplifier 13 for transmission, and then transmitted from the transmitting / receiving antenna 1 to the slave via the duplexer 2. You.

The downlink modulated wave transmitted from the transmitting / receiving antenna 1 propagates in space and is received by the transmitting / receiving antenna 31 on the slave unit side. The received modulated wave is input to the receiving high-frequency amplifier 33 via the duplexer 32. The carrier wave at an appropriate level in the high frequency amplifier 33 is supplied to the first mixer circuit 34 and the first intermediate frequency amplifier 3.
At 5, it undergoes frequency conversion to an intermediate frequency and amplification. The local oscillation input to the first mixer circuit 34 is supplied from the PLL system 43. That is, the frequency of the PLL system 43 is controlled such that the difference between the downlink carrier and the local oscillation frequency is equal to the first intermediate frequency.

The output of the first intermediate frequency amplifier 35 is input to a detector 38 via a second mixer circuit 36 and a second intermediate frequency amplifier 37, where demodulation according to the modulation method is performed.
Low frequency output. As the low-frequency output, an audio signal normally transmitted through the telephone line 21 is obtained, and a data signal from the master unit may be obtained.

The audio signal obtained by the detector 38 is
The signal is amplified to an audible level by the low-frequency amplifier 39, converted to sound by the speaker 40, and output. The above is the operation of the downlink (from the master unit to the slave unit). In the above description, the description of the accompanying circuits such as the emphasis circuit and the IDC circuit is omitted.

On the other hand, the operation of the uplink (from the slave unit to the master unit) is almost the same as that described above. The sound input to the microphone 52 of the slave unit is converted into an electric signal here, and The level becomes a level suitable for the modulator input and is input to the modulation circuit in the PLL system 43. PLL system 4
In 3, a modulated wave of the uplink frequency is generated and output to the transmitting high-frequency amplifier 42.

The high-frequency amplifier 42 outputs a carrier wave of a predetermined level, and the carrier wave is transmitted from the transmission / reception antenna 31 to the master unit via the duplexer 32. Here, there is a predetermined relationship between the uplink and downlink frequencies, and the duplexer interval of a normal low power cordless telephone is 126.35 MHz.

The uplink modulated wave transmitted from the transmitting / receiving antenna 31 propagates in space and is received by the transmitting / receiving antenna 1 on the parent device side. The received modulated wave is input to the receiving high-frequency amplifier 3 via the duplexer 2. The carrier having an appropriate level in the high frequency amplifier 3 is subjected to frequency conversion to an intermediate frequency and amplification in the first mixer circuit 4 and the first intermediate frequency amplifier 5.

The local oscillation input to the first mixer circuit 4 is P
Supplied from the LL system 14. That is, the frequency of the PLL system 14 is controlled such that the difference between the uplink carrier and the local oscillation frequency is equal to the first intermediate frequency.

The output of the first intermediate frequency amplifier 5 is input to a detector 8 via a second mixer circuit 6 and a second intermediate frequency amplifier 7, where demodulation is performed in accordance with a modulation method, and a low frequency output and Become. The low-frequency output obtained by the detector 8 is amplified to a required level in the low-frequency amplifier 9 and output to the telephone line 21 via the hybrid circuit of the speech network 10. With the above operation, two-way communication is realized.

(2) An operation of receiving a reply signal (voltage detection value data) from the slave unit in response to an interrogation signal issued from the master unit and displaying a battery exhaustion or a remaining battery capacity of the slave unit.

The output of the interval timer 18 is guided to the control system 17 of the master unit.
The control system 17 is activated. For example, when a microprocessor is used for the control system 17, the function can be realized by inputting the output of the interval timer 18 to the interrupt control terminal and activating the interrupt routine.

That is, the control system 17
Upon receiving the input of the interval timer 18, it instructs the PLL system 14 to transmit code information. This code information is transmitted between the parent device and the child device of the cordless telephone.
It contains a D code and is an interrogation signal to the slave unit.
As the interrogation signal, various types can be considered. In this embodiment, the interrogation signal is an interrogation signal including an interrogation code of the battery voltage. This interrogation signal is obtained by modulating a carrier wave by a modulation circuit in the PLL system 14, and the carrier wave modulated by the interrogation signal is sent to the high frequency amplifier 13, where it is amplified to a predetermined level. Transmitted to the slave unit.

The downlink modulated wave transmitted from the transmitting / receiving antenna 1 propagates in space and is received by the transmitting / receiving antenna 31 on the slave unit side. The received modulated wave is input to the receiving high-frequency amplifier 33 via the duplexer 32. The carrier wave at an appropriate level in the high frequency amplifier 33 is supplied to the first mixer circuit 34 and the first intermediate frequency amplifier 3.
At 5, it undergoes frequency conversion to an intermediate frequency and amplification.

The local oscillation input to the first mixer circuit 34 is
Supplied from the PLL system 43. That is, the frequency of the PLL system 43 is controlled such that the difference between the downlink carrier and the local oscillation frequency is equal to the first intermediate frequency. The output of the first intermediate frequency amplifier 35 is input to a detector 38 via a second mixer circuit 36 and a second intermediate frequency amplifier 37, where demodulation according to the modulation method is performed.
Low frequency output.

The interrogation signal, which is a low-frequency output obtained by the detector 38, is amplified to an appropriate level by a low-frequency amplifier 39, and is then input to a data decoding unit 45, where the data is decoded, and the data is decoded. It is input to 46.

In response to the inquiry signal, the control system 46 transmits a reply signal. The reply signal is detected voltage data of the battery 50 in this embodiment.
That is, the output of the voltage detector 49 that detects the voltage value of the battery 50 is guided to the control system 46, and the control system 46 receives the input from the voltage detector 49 when receiving the interrogation signal. The detected voltage data is transmitted to the master unit. That is, the response signal indicating the voltage detection value data output from the control system 46 is modulated by the modulation circuit in the PLL system 43, and the carrier modulated by the response signal is sent to the high frequency amplifier 42, where After being amplified to the level, the signal is transmitted from the transmission / reception antenna 31 to the parent device via the duplexer 32.

The output of the voltage detector 49 is also supplied to a low battery check indicator 51. When the detected voltage value from the voltage detector 49 is equal to or lower than a specified voltage value (a voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven to light the LED 54 ( Or blinking) to warn the user of the battery exhaustion.

On the other hand, the uplink modulated wave transmitted from transmitting / receiving antenna 31 propagates in space and is received by transmitting / receiving antenna 1 on the base unit side. The received modulated wave is transmitted through a duplexer 2 to a high-frequency amplifier 3 for reception.
Is input to The carrier wave at an appropriate level in the high frequency amplifier 3 is supplied to the first mixer circuit 4 and the first intermediate frequency amplifier 5
Undergoes frequency conversion to an intermediate frequency and amplification.
The local oscillation input to the first mixer circuit 4 is supplied from the PLL system 14. That is, the frequency of the PLL system 14 is controlled such that the difference between the uplink carrier and the local oscillation frequency is equal to the first intermediate frequency.

The output of the first intermediate frequency amplifier 5 is input to a detector 8 via a second mixer circuit 6 and a second intermediate frequency amplifier 7, where demodulation is performed in accordance with a modulation method, and a low frequency output and Become. The response signal which is a low-frequency output obtained by the detector 8 is amplified to an appropriate level by the low-frequency amplifier 9 and then input to the data decoding unit 16 where the data is decoded and input to the control system 17. Is done.

The control system 17 drives the display 20 as necessary based on the voltage detection value data as the response signal, and displays the voltage detection value of the slave unit. If the control system 17 stores specified voltage value data (a voltage value that requires charging of the battery 50), the control system 17 compares the data with this data and determines whether the detected voltage value is the specified voltage value. If it is less than the data, the display 20
To display, for example, the letters `` Battery depleted ''
Alternatively, an alarm (not shown) is sounded to warn the user.

(3) An operation of displaying a dead battery or a remaining capacity of a battery based on the detected voltage value data of the battery emitted from the slave unit.

The output of the interval timer 47 is guided to the control system 46 of the slave unit.
The control system 46 is activated. For example, when a microprocessor is used for the control system 46, the function can be realized by inputting the output of the interval timer 46 to the interrupt control terminal and activating the interrupt routine.

That is, the control system 46
Receiving the input of the interval timer 47, it instructs the PLL system 43 to transmit code information. This code information is transmitted between the parent device and the child device of the cordless telephone.
It contains a D code and serves as a notification signal of voltage information to the master unit.

The control system 46 includes a battery 50.
The output of the voltage detector 49 which detects the voltage value of the voltage detector 49 is guided. When the control system 46 receives the input from the interval timer 47, the control system 46 converts the voltage detection value data input from the voltage detector 49 into The notification signal is transmitted to the master unit. That is, the notification signal indicating the voltage detection value data output from the control system 46 modulates the carrier by the modulation circuit in the PLL system 43, and the carrier modulated by the notification signal is sent to the high frequency amplifier 42, where After being amplified to the level, the signal is transmitted from the transmission / reception antenna 31 to the parent device via the duplexer 32.

The output of the voltage detector 49 is also supplied to a low battery check indicator 51. When the detected voltage value from the voltage detector 49 is equal to or lower than a specified voltage value (a voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven to light the LED 54 ( Or blinking) to warn the user of the battery exhaustion.

On the other hand, the modulated uplink wave transmitted from transmitting / receiving antenna 31 propagates in space and is received by transmitting / receiving antenna 1 on the base unit side. The received modulated wave is transmitted through a duplexer 2 to a high-frequency amplifier 3 for reception.
Is input to The carrier wave at an appropriate level in the high frequency amplifier 3 is supplied to the first mixer circuit 4 and the first intermediate frequency amplifier 5
Undergoes frequency conversion to an intermediate frequency and amplification.

The local oscillation input to the first mixer circuit 4 is P
Supplied from the LL system 14. That is, the frequency of the PLL system 14 is controlled such that the difference between the uplink carrier and the local oscillation frequency is equal to the first intermediate frequency. The output of the first intermediate frequency amplifier 5 is input to a detector 8 via a second mixer circuit 6 and a second intermediate frequency amplifier 7, where demodulation is performed according to the modulation method, and a low frequency output is obtained. The low frequency output notification signal obtained by the detector 8 is amplified to an appropriate level by the low frequency amplifier 9 and then input to the data decoding unit 16 where the data is decoded and input to the control system 17. Is done.

The control system 17 drives the display 20 as necessary based on the voltage detection value data as the notification signal, and displays the voltage detection value of the slave unit. If the control system 17 stores specified voltage value data (a voltage value that requires charging of the battery 50), the control system 17 compares the data with this data and determines whether the detected voltage value is the specified voltage value. If it is less than the data, the display 20
To display, for example, the letters `` Battery depleted ''
Alternatively, an alarm (not shown) is sounded to warn the user.

When voltage information cannot be transmitted to the slave unit due to a dead battery or other reasons, a timeout is detected by the interval timer 18 of the master unit, and a detection signal is supplied to the control system 17. Based on this detection signal, the control system 17 determines that the slave unit is out of battery or is in an unusable state, and similarly displays or warns.

(4) An operation of displaying a battery exhaustion or a remaining battery capacity based on the detected battery voltage data issued from the slave unit at the end of use of the slave unit.

Normally, after the user ends a call, the user presses a hook key (not shown) of the key operation unit 48 (on-hook), so that the communication path with the master unit is cut off. . Therefore, before disconnecting the communication path in response to a key operation of the user, the voltage information may be transmitted to the master unit.

That is, the control system 46
Upon receiving a signal indicating the end of the call by operating the hook key of the key operation unit 48, the control unit instructs the PLL system 43 to transmit code information. This code information includes an ID code unique between the parent device and the child device of the cordless telephone, and serves as a notification signal of voltage information to the parent device. The output of the voltage detector 49 that detects the voltage value of the battery 50 is guided to the control system 46. When the control system 46 receives the input from the interval timer 47, the control system 46 The input voltage detection value data is transmitted to the master unit as a notification signal.

That is, the notification signal indicating the voltage detection value data output from the control system 46 is a PLL signal.
The carrier wave is modulated by the modulation circuit in the system 43, and the carrier wave modulated by the notification signal is sent to the high frequency amplifier 42, where it is amplified to a predetermined level, and then transmitted from the transmitting / receiving antenna 31 to the master unit through the duplexer 32. Is done.

The output of the voltage detector 49 is also supplied to a low battery check indicator 51. When the detected voltage value from the voltage detector 49 is equal to or lower than a specified voltage value (a voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven to light the LED 54 ( Or blinking) to warn the user of the battery exhaustion.

On the other hand, the modulated uplink wave transmitted from transmitting / receiving antenna 31 propagates in space and is received by transmitting / receiving antenna 1 on the master unit side. The received modulated wave is transmitted through a duplexer 2 to a high-frequency amplifier 3 for reception.
Is input to The carrier wave at an appropriate level in the high frequency amplifier 3 is supplied to the first mixer circuit 4 and the first intermediate frequency amplifier 5
Undergoes frequency conversion to an intermediate frequency and amplification.

The local oscillation input to the first mixer circuit 4 is P
Supplied from the LL system 14. That is, the frequency of the PLL system 14 is controlled such that the difference between the uplink carrier and the local oscillation frequency is equal to the first intermediate frequency. The output of the first intermediate frequency amplifier 5 is input to a detector 8 via a second mixer circuit 6 and a second intermediate frequency amplifier 7, where demodulation is performed according to the modulation method, and a low frequency output is obtained. The low frequency output notification signal obtained by the detector 8 is amplified to an appropriate level by the low frequency amplifier 9 and then input to the data decoding unit 16 where the data is decoded and input to the control system 17. Is done.

The control system 17 drives the display 20 as necessary based on the voltage detection value data as the notification signal, and displays the voltage detection value of the slave unit at the end of the call. Further, when prescribed voltage value data (a voltage value that requires charging of the battery 50) is stored in the control system 17, comparison with this data is performed.
If the detected voltage value is less than the specified voltage value data,
The display 20 is driven to display, for example, the characters "out of battery" or to warn the user by sounding an alarm (not shown).

(5) An operation of displaying a dead battery or a remaining capacity of a battery based on battery voltage detection value data issued from the slave when charging of the slave is completed.

The output of a voltage detector 49 for detecting the voltage of the battery 50 is guided to the control system 46 of the slave unit, and the control system 46 can monitor the voltage of the battery 50. The battery 50 is used after being charged as appropriate. The voltage at both ends of the battery 50 at this time is monitored by the control system 46, and a specified voltage value (the specified voltage value is the voltage value at the time when the charging of the battery 50 is completed) ), It is possible to know that the charging of the battery 50 is completed. In addition, in the case of rapid charging, the detection of the completion of charging can be detected when the change value of the charging voltage becomes equal to or less than a specified change value.

That is, the control system 46
Upon receiving a signal indicating the completion of charging from the voltage detector 49, P
It instructs the LL system 43 to transmit code information.
This code information includes an ID code unique between the parent device and the child device of the cordless telephone, and serves as a notification signal of voltage information to the parent device. This announcement signal is modulated by a modulation circuit in the PLL system 43, and the carrier wave modulated by the announcement signal is sent to the high-frequency amplifier 42, where it is amplified to a predetermined level. Is sent to the master unit.

The output of the voltage detector 49 is also supplied to a low battery check indicator 51. When the detected voltage value from the voltage detector 49 is equal to or lower than a specified voltage value (a voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven to light the LED 54 ( Or blinking) to warn the user of the battery exhaustion.

On the other hand, the modulated uplink wave transmitted from transmitting / receiving antenna 31 propagates in space and is received by transmitting / receiving antenna 1 on the base unit side. The received modulated wave is transmitted through a duplexer 2 to a high-frequency amplifier 3 for reception.
Is input to The carrier wave at an appropriate level in the high frequency amplifier 3 is supplied to the first mixer circuit 4 and the first intermediate frequency amplifier 5
Undergoes frequency conversion to an intermediate frequency and amplification.
The local oscillation input to the first mixer circuit 4 is supplied from the PLL system 14. That is, the frequency of the PLL system 14 is controlled such that the difference between the uplink carrier and the local oscillation frequency is equal to the first intermediate frequency.

The output of the first intermediate frequency amplifier 5 is input to a detector 8 via a second mixer circuit 6 and a second intermediate frequency amplifier 7, where demodulation is performed in accordance with a modulation method, and a low frequency output and Become. The low frequency output notification signal obtained by the detector 8 is amplified to an appropriate level by the low frequency amplifier 9 and then input to the data decoding unit 16 where the data is decoded and input to the control system 17. Is done.

In the control system 17, the battery 5 of the slave unit is determined based on the notification signal indicating the completion of charging.
It recognizes that 0 is a fully charged state. Then, the consumption of the battery 50 is calculated from the standby time and the usage time of the slave unit thereafter, and the remaining capacity of the battery 50 is obtained. Further, the control system 17 drives the display 20 as necessary based on the remaining capacity thus obtained, and displays the usable time, the voltage level, and the like of the slave unit.

When prescribed remaining capacity data (remaining capacity value data that requires charging of the battery 50) is stored in the control system 17, the data is compared with this data and obtained by calculation. If the remaining capacity value is equal to or less than the specified remaining capacity value data, the display 20 is driven to display, for example, the characters "out of battery" or to sound an alarm (not shown) to the user. Warn. In the operation (5), it is not always necessary to transmit the voltage value data to the master device, but a signal indicating the completion of charging may be transmitted. In this way, the code can be simplified.

[0068]

Battery status indicator of a cordless telephone according to the present invention is the slave unit side, and a voltage detecting means for detecting the voltage of built-in battery, that due to an instruction from the master unit optionally
With and transmitting means for an arbitrary Thailand Min <br/> grayed which is determined by the internal timing or slave unit transmits the detected voltage value data of the voltage detecting means to the base-side, in the base unit,
Receiving means for receiving the detected voltage value data transmitted by the transmitting means, and display means for displaying the use state of the battery based on the detected voltage value data received by the receiving means, The arbitrary timing according to the instruction is the timing at the end of counting for a certain time by the timer, and the arbitrary timing determined inside the slave unit.
Lee timing is timing when the count termination of a predetermined time by a timer, or timing of on-hook of the handset, or since the timing for completion of charging the internal battery, and displays the battery exhaustion or the like of the mobile device with the base-side Thus, even if the battery of the slave unit is exhausted, a warning such as a dead battery can be issued to the user. In addition, since the master unit receives voltage detection value data from the slave unit at various times as described above, the battery status of the slave unit can be more accurately grasped, and the voltage detection value of the slave unit is constantly monitored. Since there is no need to perform this operation, various effects such as the consumption of the internal battery of the slave unit can be minimized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an electrical configuration of a base unit of a cordless telephone according to the present invention.

FIG. 2 is a block diagram showing an electrical configuration of a slave unit of the cordless telephone according to the present invention.

[Explanation of symbols]

 1,31 transmitting / receiving antenna 3,33 high-frequency amplifier for reception 4,34 first mixer circuit 5,35 first intermediate frequency amplifier 6,36 second mixer circuit 7,37 second intermediate frequency amplifier 8,38 detector 9, 39 Low frequency amplifier 12, 41 Local oscillator 13, 42 High frequency amplifier for transmission 14, 43 PLL system 15, 44 Reference oscillator 16, 45 Data decoding unit 18, 47 Interval timer 17, 46 Control system 49 Voltage detector 50 Battery

Claims (1)

(57) [Claims] 1. A cordless telephone comprising a base unit connected to a telephone line and a base unit having a primary battery or a secondary battery connected to the base unit by a wireless line. a voltage detecting means for detecting the voltage of the the battery, the detection of the voltage detecting means at any Thailand timing is any timing also <br/> that by the instruction that has been determined within the slave unit from the master unit Transmitting means for transmitting voltage value data to the master unit, receiving means for receiving the detected voltage value data transmitted by the transmitting means to the master unit, and detecting voltage values received by the receiving means; Display means for displaying the use state of the battery based on the data, an arbitrary timing according to an instruction from the master unit is a timing at the end of counting of a certain time by a timer,
Any Thailand timing that is determined within the slave unit, and characterized by a timing when fully charged hook during timing, or built-in battery of the timing at the end of counting a predetermined time by a timer, or slave unit Battery status display for cordless telephones.