JPH04250756A - Display device for battery state of cordless telephone set - Google Patents

Abstract

PURPOSE:To warn a worn battery of a slave set to the user by sending a detection voltage of the battery of the slave set to a master set in an optional timing decided in the inside of the slave set. CONSTITUTION:A voltage detector 49 detects a voltage of a battery 50 in a slave set. The detected voltage data is sent to a master set in an optional timing decided in the inside of the slave set or by a command from the master set. For example, an interval timer 47 counts a prescribed time according to a command from the master set and the count is sent to the slave set for each end of the count. The master set analyzes the voltage detection data from the slave set sent in the timing as above to display the operating state of the battery 50. Thus, even the master set can confirm a worn battery of the slave set.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to cordless telephones, and more particularly to a battery status display device for cordless telephones that allows display of the battery depletion of a slave unit, remaining battery capacity, etc. on the base unit side.

0002

2. Description of the Related Art Cordless telephones have recently become widespread and are now widely used. Cordless telephones eliminate cords that are complicated to handle, and are much more convenient than conventional telephones. In other words, it is possible to make a call anywhere within the radio wave range between the base unit and the handset, and the degree of freedom in choosing a place to talk is greatly expanded.

[0003] By the way, cordless telephone handsets, due to their nature, need to store a power source internally, and have a built-in primary battery, secondary battery, or the like as a power source. The built-in battery is naturally consumed, but since its capacity is finite, it is necessary to replace the battery (in the case of a primary battery) or charge it (in the case of a secondary battery). However, since the remaining capacity of the battery is invisible, it is difficult to know when to replace or charge it.
There were cases where the battery ran out and became unusable.

[0004] To prevent such problems from occurring, conventional cordless telephones now display a message on the handset when the battery is about to run out, prompting the user to replace or charge the battery. ing.

[0005]

[Problem to be Solved by the Invention] If the battery exhaustion is indicated by lighting or flashing, for example, an LED, etc., the battery exhaustion warning itself consumes the battery in the handset, which further accelerates battery consumption. There was such a problem. Therefore, a method is currently being used to disable such battery warnings after a certain period of time, but when considering the usage of cordless phones, it is important to note that the user is not always near the handset, so the warning for a certain period of time is does not necessarily have meaning.

[0006] Furthermore, in order to issue a warning, it is necessary that the built-in battery has some remaining capacity, and there is a problem in that a warning cannot even be issued when the built-in battery is exhausted.

[0007] The present invention was made in view of the above-mentioned circumstances, and its purpose is to display the battery depletion of the handset on the base unit so that even if the battery of the handset is exhausted, the user can An object of the present invention is to provide a battery status display device for a cordless telephone that is capable of issuing a warning.

[0008]

[Means for Solving the Problems] In order to solve the above problems, a battery status display device for a cordless telephone according to the present invention includes a base unit connected to a telephone line, and a base unit connected to the base unit via a wireless line. In a cordless telephone consisting of a handset having a built-in primary battery or a secondary battery, the handset has voltage detection means for detecting the voltage of the built-in battery, and a voltage detecting means for detecting the voltage of the built-in battery, and a voltage detection means determined by an instruction from the base unit or within the handset. transmitting means for transmitting the detected voltage value data of the voltage detecting means to the base unit side at any timing determined by the voltage detecting unit; and a receiving unit for receiving the detected voltage value data transmitted by the transmitting unit to the base unit. and display means for displaying the usage status of the battery based on the detected voltage value data received by the receiving means.

[0009]

[Operation] Inside the handset, the voltage of the built-in battery is detected by the voltage detection means. This detected voltage value data is then transmitted to the base unit according to an instruction from the base unit or at an arbitrary timing determined within the slave unit. The instructions from the parent device are sent to the slave device by counting a certain period of time using, for example, an interval timer, and each time the count ends. Furthermore, the arbitrary timing determined within the handset is, for example, the timing at the end of a certain period of time counted by an interval timer, or the timing at the end of the time when the handset is used (on-hook). , and the timing when the built-in battery is fully charged.

[0010] The master unit analyzes the voltage detection value data sent from the slave unit at such timing and drives the display means to display the battery usage status (for example, the battery voltage level and battery depletion). warnings, etc.). This results in
Even on the parent device side, it becomes possible to check whether the battery of the slave device is running low or the like.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the electrical configuration of the base unit of the cordless telephone according to the present invention, and FIG. 2 is a block diagram showing the electrical configuration of the slave unit of the cordless telephone according to the present invention.

In FIG. 1, the 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 guided to a second mixer circuit 6 via a first intermediate frequency amplifier 5. Further, 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 . Further, the output of the wave detector 8 is guided via a low frequency amplifier 9 to a speech network 10 connected to a telephone line 21.

A handset 11 having a built-in microphone and speaker is bidirectionally connected to the speech network 10 . Further, the output of the low frequency amplifier 9 is guided through a data decoding section 16 to a control system 17 consisting of a microcomputer. The control system 17 is led to the output of an interval timer 18 that counts a certain period of time, and the output of a key operation unit 19 equipped with dial keys, etc., and the output is connected to the display 20 and the PLL system 14. guided by.

The PLL system 14 also includes the output of the speech network 10 and the reference oscillator 1.
The output of 5 is guided to the first mixer circuit 4 and the high frequency amplifier 13. Further, the configuration is such that 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 guided to a first intermediate frequency amplifier 35. is led to the second mixer circuit 36 via. In addition, the second mixer circuit 3
6, the output of the local oscillator 41 is led to the second mixer circuit 36, and the output of the second mixer circuit 36 is led to the second intermediate frequency amplifier 3.
7 to a detector 38. In addition, the detector 3
8 is guided to a built-in speaker 40 via a low frequency amplifier 39. Furthermore, the output of the low frequency amplifier 39 is guided through a data decoding section 45 to a control system 46 consisting of a microcomputer.

The control system 46 is led to the output of an interval timer 47 that counts a certain period of time, and the output of a key operation section 48 equipped with dial keys, etc., and the output is led to the PLL system 43. It's dark. Further, the output of the voltage detector 49 that detects the voltage of the primary battery or secondary battery (hereinafter simply referred to as battery) 50 is as follows:
It is guided to the control system 46 and to a low battery check indicator 51, and the output of the low battery check indicator 51 is output to the LED 54.
is given to drive the LED 54 to turn on (or blink)
It is supposed to be done.

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

Among the above-mentioned configurations, the transmitting/receiving antenna 1
, 31, deep plexers 2, 32, high frequency amplifiers for reception 3, 33, first mixer circuits 4, 34, first intermediate frequency amplifiers 5, 35, second mixer circuits 6, 36, second intermediate frequency amplifier 7, 37, detector 8, 38, low frequency amplifier 9, 3
9, local oscillators 12, 41, high frequency amplifiers for transmission 13, 42, PLL systems 14, 43, reference oscillators 15, 44, data decoding units 16, 45,
Regarding the operation of the interval timers 18 and 47, see Figure 1.
The carrier frequency (380MHz band) from the parent device to the child device (downlink) and the carrier frequency from the child device to the parent device (uplink) are almost common to the parent device shown in Figure 2 and the child device shown in Figure 2. (250MHz band) is the only difference.

[0020] Furthermore, the base unit is connected to a telephone line such as a public communication network through a telephone line 21, so that voice information can be exchanged. Also, Speech Network 10
includes a hybrid circuit, and separates and mixes the voices of the microphone and speaker, which are the components of the handset 11. Furthermore, when this telephone is used not as a cordless telephone but as a base handset 11, only this part is basically necessary, and the operation is the same as that of a normal telephone. However, in order to simplify the explanation, the ringer, return coil, etc. are omitted.

For convenience, the input and output of the handset 11 is connected to a low frequency amplifier 9 via a speech network 10.
Although shown connected to the output of the low frequency amplifier 9 and the input of the PLL system 14, it may be more convenient to connect the output of the low frequency amplifier 9 directly to the input of the PLL system 14 depending on the manufacturing of the equipment. .

Next, the operation of the cordless telephone with the above configuration will be explained as follows: (1) the operation of a general cordless telephone; (2) the response signal (response signal) from the handset in response to the interrogation signal issued from the base unit; (3) Displaying the dead battery and remaining battery capacity based on the battery voltage detection value data emitted from the slave unit. , (4) Operation of displaying the battery depletion and remaining battery capacity based on the battery voltage detection value data emitted from the slave unit at the end of use of the slave unit, (5
) The operation of displaying the battery exhaustion and remaining battery capacity based on the battery voltage detection value data issued from the slave unit when charging of the slave unit is completed will be explained separately.

(1) Operation of a general cordless telephone. 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 to a downlink frequency, amplified by a high frequency amplifier 13 for transmission, and then transmitted from the transmitting/receiving antenna 1 to the handset side via the duplexer 2. Ru.

The downlink modulated wave transmitted from the transmitting/receiving antenna 1 propagates through space and is received by the transmitting/receiving antenna 31 on the handset side. The received modulated wave is input to a high frequency amplifier 33 for reception via a duplexer 32. The carrier wave that has reached an appropriate level in the high frequency amplifier 33 is transferred to the first mixer circuit 34 and the first intermediate frequency amplifier 3.
5, it undergoes frequency conversion to an intermediate frequency and amplification. Local oscillation input to the first mixer circuit 34 is supplied from a PLL system 43. That is, the frequency of the PLL system 43 is controlled so that the difference between the downlink carrier wave 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 it is demodulated according to the modulation method.
Low frequency output. As the low frequency output, usually a voice signal sent through the telephone line 21 is obtained, and a data signal from the base unit may also be obtained.

The audio signal obtained by the detector 38 is
The low frequency amplifier 39 amplifies the signal to an audible level, and the speaker 40 converts the signal into sound, which is output. The above is the downlink operation (from the base unit to the slave unit). Note that in the above description, descriptions of accompanying circuits such as an emphasis circuit and an IDC circuit are omitted.

On the other hand, the operation of uplink (from the slave unit to the base unit) is almost the same as the above operation, and the audio input to the microphone 52 of the slave unit is converted into an electrical signal here, and then the amplifier 53 outputs the sound. The level becomes suitable for the modulator input, and is input to the modulation circuit in the PLL system 43. PLL system 4
3, a modulated wave of the uplink frequency is created and output to the high frequency amplifier 42 for transmission.

The high frequency amplifier 42 outputs a carrier wave of a predetermined level, and the carrier wave is transmitted from the transmitting/receiving antenna 31 to the base unit side via the duplexer 32. Here, there is a determined relationship between uplink and downlink frequencies, and the duplexer spacing of a typical low-power cordless telephone is 126.35 MHz.

The uplink modulated wave transmitted from the transmitting/receiving antenna 31 propagates through space and is received by the transmitting/receiving antenna 1 on the base unit side. The received modulated wave is input to a receiving high frequency amplifier 3 via a duplexer 2. The carrier wave that has reached an appropriate level in the high frequency amplifier 3 undergoes 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
It is 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 wave and the local oscillation frequency is equal to the first intermediate frequency.

The output of the first intermediate frequency amplifier 5 is input to the detector 8 via the second mixer circuit 6 and the second intermediate frequency amplifier 7, where it is demodulated according to the modulation method and is converted into a low frequency output. Become. The low frequency output obtained by the wave 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. Through the above operations, two-way communication is realized.

(2) An operation of receiving a reply signal (voltage detection value data) from the slave unit in response to a question signal issued from the base unit and displaying the battery depletion and remaining battery capacity of the slave unit.

The output of the interval timer 18 is led to the control system 17 of the master unit, and the output of the interval timer 18, which is output at fixed intervals, allows
The control system 17 is activated. For example, when a microprocessor is used in the control system 17, functions can be realized by inputting the output of the interval timer 18 to an interrupt control terminal and activating an interrupt routine.

That is, the control system 17
Upon receiving the input from the interval timer 18, the PLL system 14 is commanded to transmit code information. This code information is a unique I/O between the base unit and handset of this cordless phone.
It contains a D code and serves as an interrogation signal for the handset. Various types of interrogation signals are possible, but in this embodiment, the interrogation signal includes a battery voltage interrogation code. This interrogation signal modulates a carrier wave in a modulation circuit in the PLL system 14, and the carrier wave modulated with the interrogation signal is sent to a high frequency amplifier 13, where it is amplified to a predetermined level, and then passed through a duplexer 2 to a transmitting/receiving antenna 1. is sent from to the slave unit.

The downlink modulated wave transmitted from the transmitting/receiving antenna 1 propagates through space and is received by the transmitting/receiving antenna 31 on the handset side. The received modulated wave is input to a high frequency amplifier 33 for reception via a duplexer 32. The carrier wave that has reached an appropriate level in the high frequency amplifier 33 is transferred to the first mixer circuit 34 and the first intermediate frequency amplifier 3.
5, it undergoes frequency conversion to an intermediate frequency and amplification.

The local oscillation input to the first mixer circuit 34 is as follows:
It is supplied from the PLL system 43. That is, the frequency of the PLL system 43 is controlled so that the difference between the downlink carrier wave and the local oscillation frequency is equal to the first intermediate frequency. The output of the first intermediate frequency amplifier 35 is input to the detector 38 via the second mixer circuit 36 and the second intermediate frequency amplifier 37, where it is demodulated according to the modulation method.
Low frequency output.

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

The control system 46 receives this inquiry signal and transmits a response signal, and the response signal here is voltage detection value data of the battery 50 in this embodiment. That is, the control system 46 is led to the output of the voltage detector 49 that detects the voltage value of the battery 50, and when the control system 46 receives the interrogation signal, the control system 46 receives the input from the voltage detector 49. The detected voltage data is sent to the base unit. That is, a response signal indicating voltage detection value data outputted from the control system 46 modulates a carrier wave in a modulation circuit in the PLL system 43, and the carrier wave modulated by the response signal is sent to the high frequency amplifier 42, where a predetermined signal is output. After being amplified to a high level, the signal is transmitted via the duplexer 32 from the transmitting/receiving antenna 31 to the base unit side.

The output of the voltage detector 49 is also given to a low battery check indicator 51. If the detected voltage value from the voltage detector 49 is less than a specified voltage value (voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven and the LED 54 is turned on ( or blinking) to warn the user that the battery is running low.

On the other hand, 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 base unit side. The received modulated wave is input to a receiving high frequency amplifier 3 via a duplexer 2. The carrier wave that has reached an appropriate level in the high frequency amplifier 3 undergoes 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 supplied from a PLL system 14 . That is, the frequency of the PLL system 14 is controlled such that the difference between the uplink carrier wave and the local oscillation frequency is equal to the first intermediate frequency.

The output of the first intermediate frequency amplifier 5 is input to the detector 8 via the second mixer circuit 6 and the second intermediate frequency amplifier 7, where it is demodulated according to the modulation method and is converted into a low frequency output. Become. The response signal, which is a low frequency output obtained by the wave detector 8, is amplified to an appropriate level by a low frequency amplifier 9, and then input to a data decoding section 16, where the data is decoded and input to a control system 17. be done.

The control system 17 drives the display 20 as necessary based on the detected voltage value data, which is the response signal, to display the detected voltage value of the slave device. In addition, specified voltage value data (
A voltage value at which the battery 50 needs to be charged. ) is stored, a comparison is made with this data, and if the detected voltage value is less than the specified voltage value data, the display 20 is driven to display, for example, the words "Battery exhausted". The alarm is displayed or an alarm (not shown) is sounded to warn the user.

(3) An operation for displaying battery exhaustion and remaining battery capacity based on battery voltage detection value data emitted from the handset.

The output of the interval timer 47 is led to the control system 46 of the slave device, and the output of the interval timer 47, which is output at fixed intervals, allows
Control system 46 is activated. For example, when a microprocessor is used in the control system 46, functions can be realized by inputting the output of the interval timer 46 to an interrupt control terminal and activating an interrupt routine.

That is, the control system 46:
Upon receiving the input from the interval timer 47, it instructs the PLL system 43 to transmit code information. This code information is a unique I/O between the base unit and handset of this cordless phone.
It includes a D code and serves as a voltage information notification signal to the base unit.

The control system 46 includes a battery 50.
The control system 46 receives the voltage detection value data input from the voltage detector 49 when receiving the input from the interval timer 47. It is designed to be sent to the base unit as a notification signal. That is, the notification signal indicating the voltage detection value data outputted from the control system 46 modulates a carrier wave in a modulation circuit in the PLL system 43, and the carrier wave modulated by the notification signal is sent to the high frequency amplifier 42, where a predetermined signal is output. After being amplified to a high level, the signal is transmitted via the duplexer 32 from the transmitting/receiving antenna 31 to the base unit side.

The output of the voltage detector 49 is also given to a low battery check indicator 51. If the detected voltage value from the voltage detector 49 is less than a specified voltage value (voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven and the LED 54 is turned on ( (or flashing) to warn the user that the battery is running low.

On the other hand, the uplink modulated wave transmitted from the transmitting/receiving antenna 31 propagates through space and is received by the transmitting/receiving antenna 1 on the base unit side. The received modulated wave is input to a receiving high frequency amplifier 3 via a duplexer 2. The carrier wave that has reached an appropriate level in the high frequency amplifier 3 undergoes 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
It is 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 wave and the local oscillation frequency is equal to the first intermediate frequency. The output of the first intermediate frequency amplifier 5 is input to the detector 8 via the second mixer circuit 6 and the second intermediate frequency amplifier 7, where it is demodulated according to the modulation method and becomes a low frequency output. The notification signal, which is the low frequency output obtained by the wave detector 8, is amplified to an appropriate level by the low frequency amplifier 9, and then input to the data decoding section 16, where the data is decoded and input to the control system 17. be done.

[0050] The control system 17 drives the display 20 as necessary based on the voltage detection value data, which is the notification signal, to display the voltage detection value of the slave unit. In addition, specified voltage value data (
A voltage value at which the battery 50 needs to be charged. ) is stored, a comparison is made with this data, and if the detected voltage value is less than the specified voltage value data, the display 20 is driven to display, for example, the words "Battery exhausted". The alarm is displayed or an alarm (not shown) is sounded to warn the user.

Furthermore, when the handset cannot transmit voltage information due to a dead battery or other reasons, a timeout is detected by the interval timer 18 on the base side, and a detection signal is given to the control system 17. Based on this detection signal, the control system 17 determines that the handset is out of battery or is in an unusable state, and similarly displays or warns.

(4) An operation for displaying the battery depletion and remaining battery capacity based on the battery voltage detection value data emitted from the handset at the end of use of the handset.

Normally, after finishing a call, the user presses a hook key (not shown) on the key operation unit 48 (on-hook) to cut off the communication path with the base unit. . Therefore, the voltage information may be transmitted to the base unit before disconnecting the communication path in response to the user's key operation.

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 PLL system 43 is commanded to transmit code information. This code information includes an ID code unique between the base unit and handset of this cordless telephone, and serves as a voltage information notification signal for the base unit. The control system 46 is led to the output of the voltage detector 49 that detects the voltage value of the battery 50, and when the control system 46 receives an input from the interval timer 47, the control system 46 receives the output from the voltage detector 49. The input voltage detection value data is sent to the base unit as a notification signal.

That is, the notification signal indicating the voltage detection value data output from the control system 46 is
A modulation circuit in the system 43 modulates the carrier wave, and the carrier wave modulated with 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 base unit side via the duplexer 32. be done.

The output of the voltage detector 49 is also given to a low battery check indicator 51. If the detected voltage value from the voltage detector 49 is less than a specified voltage value (voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven and the LED 54 is turned on ( (or flashing) to warn the user that the battery is running low.

On the other hand, the uplink modulated wave transmitted from the transmitting/receiving antenna 31 propagates through space and is received by the transmitting/receiving antenna 1 on the base unit side. The received modulated wave is input to a receiving high frequency amplifier 3 via a duplexer 2. The carrier wave that has reached an appropriate level in the high frequency amplifier 3 undergoes 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
It is 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 wave and the local oscillation frequency is equal to the first intermediate frequency. The output of the first intermediate frequency amplifier 5 is input to the detector 8 via the second mixer circuit 6 and the second intermediate frequency amplifier 7, where it is demodulated according to the modulation method and becomes a low frequency output. The notification signal, which is the low frequency output obtained by the wave detector 8, is amplified to an appropriate level by the low frequency amplifier 9, and then input to the data decoding section 16, where the data is decoded and input to the control system 17. be done.

The control system 17 drives the display 20 as necessary based on the voltage detection value data, which is the notification signal, to display the voltage detection value of the handset at the end of the call. In addition, if prescribed voltage value data (voltage value that requires charging of the battery 50) is stored in the control system 17, a comparison is made with this data,
If the voltage detection value is less than the specified voltage value data,
The display device 20 is driven to display, for example, the words "depleted battery" or to sound an alarm (not shown) to warn the user.

(5) Operation of displaying the battery depletion and remaining capacity of the battery based on the battery voltage detection value data issued from the slave unit when charging of the slave unit is completed.

The output of a voltage detector 49 for detecting the voltage of the battery 50 is led to the control system 46 of the slave device, so that the control system 46 can monitor the voltage of the battery 50. The battery 50 is charged and used as appropriate, but the voltage across the battery 50 at this time is monitored by the control system 46 and set to a specified voltage value (
This specified voltage value is the voltage value when charging of the battery 50 is completed. ), the completion of charging of the battery 50 can be known. In addition, this charging completion detection is
In the case of rapid charging, it 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
The LL system 43 is commanded to transmit code information. This code information includes an ID code unique between the base unit and handset of this cordless telephone, and serves as a voltage information notification signal for the base unit. This notification signal modulates a carrier wave in a modulation circuit in the PLL system 43, and the carrier wave modulated with the notification signal is sent to a high frequency amplifier 42, where it is amplified to a predetermined level, and then passed through a duplexer 32 to a transmitting/receiving antenna 31. is sent from the base unit to the base unit.

The output of the voltage detector 49 is also given to a low battery check indicator 51. If the detected voltage value from the voltage detector 49 is less than a specified voltage value (voltage value that requires charging of the battery 50), the low battery check indicator 51 is driven and the LED 54 is turned on ( (or flashing) to warn the user that the battery is running low.

On the other hand, 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 base unit side. The received modulated wave is input to a receiving high frequency amplifier 3 via a duplexer 2. The carrier wave that has reached an appropriate level in the high frequency amplifier 3 undergoes 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 supplied from a PLL system 14 . That is, the frequency of the PLL system 14 is controlled such that the difference between the uplink carrier wave and the local oscillation frequency is equal to the first intermediate frequency.

The output of the first intermediate frequency amplifier 5 is input to the detector 8 via the second mixer circuit 6 and the second intermediate frequency amplifier 7, where it is demodulated according to the modulation method and is converted into a low frequency output. Become. The notification signal, which is the low frequency output obtained by the wave detector 8, is amplified to an appropriate level by the low frequency amplifier 9, and then input to the data decoding section 16, where the data is decoded and input to the control system 17. be done.

The control system 17 controls the battery 5 of the slave unit based on this notification signal indicating the completion of charging.
Recognize that 0 is a fully charged state. Then, the consumption amount of the battery 50 is calculated from the subsequent standby time and the usage time of the handset, and the remaining capacity of the battery 50 is obtained. Furthermore, the control system 17 drives the display 20 as necessary based on the remaining capacity obtained in this way to display the usable time, voltage level, etc. of the slave device.

[0067] In addition, if specified remaining capacity data (remaining capacity value data that requires charging of the battery 50) is stored in the control system 17, a comparison is made with this data and the data is calculated by calculation. If the remaining capacity value is less than the specified remaining capacity value data, the display 20 is driven to display the words "Battery exhausted" or an alarm (not shown) is sounded to alert the user. give a warning. Note that in the operation (5) above, it is not necessarily necessary to transmit voltage value data to the base unit side, and it is sufficient to send a signal indicating completion of charging. In this way, the code can be simplified.

[0068]

Effects of the Invention The battery status display device for a cordless telephone according to the present invention includes a voltage detecting means for detecting the voltage of the built-in battery on the handset side, and a voltage detecting means for detecting the voltage of the built-in battery, and a voltage detecting means for detecting the voltage of the built-in battery. and transmitting means for transmitting the detected voltage value data of the voltage detecting means to the base unit side with arbitrary timing, and receiving means for receiving the detected voltage value data transmitted by the transmitting means on the base unit side; Since the configuration includes a display unit that displays the usage status of the battery based on the detected voltage value data received by the receiving unit, it is possible to display the battery depletion of the slave unit on the base unit side. Even if the battery runs out, it is possible to issue a warning to the user that the battery is running out.

[Brief explanation of the drawing]

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

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

[Explanation of symbols]

1, 31 Transmitting and receiving antennas 3, 33 Receiving high frequency amplifiers 4, 34 First mixer circuits 5, 35 First intermediate frequency amplifiers 6, 36 Second mixer circuits 7, 37 Second intermediate frequency amplifiers 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 section 18, 47 Interval timer 17, 46 Control system 49 Voltage detector 50 Battery

Claims (1)

[Claims] Claim 1. A cordless telephone comprising a base unit connected to a telephone line, and a slave unit having a built-in primary battery or a secondary battery connected to the base unit via a wireless line, wherein the slave unit has a built-in battery. voltage detection means for detecting the voltage of the battery that has been detected; and a transmission for transmitting detected voltage value data of the voltage detection means to the base unit according to an instruction from the base unit or at arbitrary timing determined within the slave unit. and a receiving means for receiving the detected voltage value data transmitted by the transmitting means on the base unit, and displaying the usage state of the battery based on the detected voltage value data received by the receiving means. 1. A battery status display device for a cordless telephone, comprising display means.