JP3038281B2 - Cordless telephone - Google Patents

Abstract

PURPOSE:To transmit data to a slave unit without incurring the complication of a charging circuit even when rapid charging is performed. CONSTITUTION:A charging means 12 performs the rapid charging or trickle charging by changing the ratio of an ON period and an OFF period and also performs control so as to make the respective ON period and OFF period longer than a period required for the transmission of the unit bit of data. Then, a judging means 30 judges whether a supplied voltage is a charging voltage or the voltage for indicating the data based on the length of the ON period and the OFF period and the ON period and the OFF period of the voltage appearing in a slave unit charging terminal 15 and lets the data read by a slave unit control part 31 when it is the voltage for indicating the data.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone in which a rechargeable battery is rapidly charged or trickle-charged according to the use condition of the rechargeable battery in a slave unit.

[0002]

2. Description of the Related Art In order to ensure that a continuous talk time of a handset can always be maintained for a predetermined time, it is necessary to always keep a rechargeable battery in the handset in a fully charged state. For this reason, Japanese Patent Application Laid-Open No. 2-37849 has proposed a configuration in which the rechargeable battery is brought into a fully charged state in a short time by performing rapid charging. This configuration will be described below with reference to FIG.

In this wireless telephone device, as a charging circuit,
Two charging circuits are provided, a charging circuit 92 for performing quick charging and a charging circuit 93 for performing standard charging. When quick charging is performed even after the charging of the rechargeable battery 94 in the slave unit 91 is completed, the rechargeable battery 94 may be overcharged. By calculating the calculated time, the discharge state of the rechargeable battery 94 is calculated.

By operating the rapid charging circuit 93 for a period corresponding to the calculated time, the charging of the rechargeable battery 94 is completed in a short time without overcharging. Then, by operating the standard charging circuit 93, the state of the rechargeable battery 94 is maintained in the charging completed state.

[0005]

However, in the above configuration, two charging circuits, a standard charging circuit 93 and a rapid charging circuit 92, are required as the charging circuits, so that the configuration of the charging circuit becomes complicated. There was a problem.

On the other hand, a charging circuit that controls the average current supplied to the rechargeable battery by controlling the supply period and the non-supply period of the charging voltage, and performs quick charging or standard charging (trickle charging) by this control is provided. It has already been proposed.

However, when this charging circuit is applied to a cordless telephone in which data is transmitted from the master unit to the slave unit via the charging terminal, the charging terminal voltage is repeatedly turned on and off. May be mistaken for a voltage indicating data from the master unit. Therefore, in this charging circuit, a configuration having two charging circuits has to be used, and there is a problem that the circuit configuration is similarly complicated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to perform data transmission to a slave unit without incurring a complicated charging circuit even when quick charging is performed. It is an object of the present invention to provide a cordless telephone capable of performing such operations.

[0009]

In order to solve the above-mentioned problems, a cordless telephone according to the present invention is provided by way of a base unit charging terminal provided on the base unit side and a mobile unit charging terminal provided on the handset side. The present invention is applied to a cordless telephone that transmits data from the master unit to the slave unit, and a period during which a charging voltage is transmitted to the master unit charging terminal or a period during which the charging voltage appears at the slave unit charging terminal is an ON period, When a period during which the charging voltage is not transmitted to the parent device charging terminal or a period during which the charging voltage does not appear at the child device charging terminal is referred to as an off period, the parent device turns on the charging voltage transmitted to the parent device charging terminal. By performing the control of the period and the off period, a charging means for performing quick charging or trickle charging of the rechargeable battery in the slave unit is provided, and the slave unit has an on period of a voltage appearing at the slave unit charging terminal, off Determining means for determining whether the voltage supplied to the slave unit charging terminal is a charging voltage or a voltage indicating data based on the length of the ON period or the OFF period. A slave unit control unit that reads data based on a change in the voltage appearing at the slave unit charging terminal when it is determined that the voltage appearing at the slave unit charging terminal is a voltage indicating data. The charging means is configured to perform a control such that each of the on-period and the off-period of the charging voltage transmitted to the parent device charging terminal is longer than the period required for transmitting the unit bit of the data.

[0010]

The charging means performs quick charging or trickle charging by changing the ratio between the ON period and the OFF period, and each of the ON period and the OFF period is shorter than the period required for transmitting a unit bit of data. Perform longer control. On the slave unit side, is the voltage applied to the slave unit charging terminal the charging voltage based on the ON period, the OFF period, or the length of the ON period and the OFF period of the voltage appearing at the slave unit charging terminal? , Or a voltage indicating data.

When it is determined that the voltage appearing at the slave unit charging terminal is a voltage indicating data, the slave unit control unit reads data based on the change in the voltage appearing at the slave unit charging terminal.

[0012]

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

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

In the figure, a positive terminal of a DC jack 16 to which an AC adapter (not shown) is connected is connected to a regulator 21, and an output of the regulator 21 is given to a current detection circuit 22. The output of the current detection circuit 22 is guided to the voltage control circuit 23.

The minus terminal of the DC jack 16 is
It is connected to a regulator 21 and a voltage control circuit 23. From the voltage control circuit 23, the master unit charging terminal 14
The output is sent to the plus terminal and the minus terminal.

An output from the main control unit 25 is sent to a charge amount calculation unit 24 and a data transmission control unit 27, and an output from the charge amount calculation unit 24 is given to a charge control unit 26. The voltage control circuit 23 includes a charge control unit 26
And the output of the data transmission control unit 27 are introduced, and the output of the current detection circuit 22 is guided to the charge control unit 26.

The plus terminal of the slave unit charging terminal 15 is connected to the anode of the diode D1 and is connected to the resistor R2.
Is connected to the base of the transistor Q2.
The cathode of the diode D1 is connected to the collector of the transistor Q2 via the resistor R3, and is also led to the plus terminal of the rechargeable battery 28 and the load 29.

The minus terminal of the child device charging terminal 15 is
It is connected to the emitter of the transistor Q2, the negative terminal of the rechargeable battery 28, and the load 29. The collector of the transistor Q2 is connected to the determination unit 30 and the slave unit control unit 31.
The slave unit control unit 31 is provided with an output from the determination unit 30.

In the above configuration, the base unit 11 is configured by the base unit charging terminal 14 and the DC jack 16 and blocks denoted by reference numerals 21 to 27. Terminal 15, diode D1, two resistors R2 and R3, rechargeable battery 28, load 29, determination means 30,
And the slave unit control unit 31.

The charging means 12 is composed of two blocks, a voltage control circuit 23 and a charging control section 26.

The charge amount calculation unit 24, the main control unit 25, the charge control unit 26, and the data transmission control unit 27
1 is constituted by software executed by a microcomputer provided in the slave unit 1. The determination unit 30 and the slave unit control unit 31 include software executed by a microcomputer provided in the slave unit 13. It is composed mainly of wear.

Hereinafter, the configuration of each block will be described in detail.

The regulator 21 is a block for stabilizing the DC voltage applied to the DC jack 16. The current detection circuit 22 detects a current value output to the parent device charging terminal 14 via the voltage control circuit 23,
The detection result is sent to the charge control unit 26 as a block.

The voltage control circuit 23 is connected to the main unit charging terminal 1.
4, a transistor Q1 connecting the plus terminal of the fourth transistor to the minus terminal, and a base resistor R1.
According to the output from charging control unit 26, base unit charging terminal 14
Is a block for supplying or not supplying a charging voltage.

The main control unit 25 is a block for controlling functions (communication with the slave unit 13) as the master unit 11. The charge amount calculator 24 accumulates the time during which the slave unit 13 has made a call according to the information provided from the main control unit 25, and recharges the battery (nickel cadmium battery) 2 in the slave unit 13.
8 is a block for calculating the required charge amount.

The charge control unit 26 includes a charge amount calculation unit 24
Is a block for performing quick charge or trickle charge on the rechargeable battery 28 in accordance with the output of the above. The average current value of the charge in the quick charge is set to a plurality of types of current values in advance. Thus, a current value corresponding to the output of the current detection circuit 22 is selected from these current values.

The data transmission control section 27 controls the operation of the voltage control circuit 23 to transmit data designated by the main control section 25 to the parent device charging terminal 14.

Two resistors R provided on the slave unit 13 side
2, a block including R3 and transistor Q2 is a voltage detection block for detecting that a voltage is applied to the plus terminal of the child device charging terminal 15.

In accordance with the output of the above-described voltage detection block, the judging means 30 determines whether the voltage applied to the slave unit charging terminal 15 is a voltage for charging or a voltage for data. This is a block for determining whether or not it is present and sending the determination result to the slave unit control unit 31.

The slave unit controller 31 is a block for controlling the operation of the slave unit 13 and, when it is notified by the judging means 30 that data is being guided to the slave charging terminal 15, the data is transmitted to the slave unit. It is a block for reading.

The load 29 is a block that indicates all the blocks that require a power supply, such as a microcomputer that constitutes the determination unit 30 and the slave unit control unit 31, and blocks that are necessary for other operations. Yes, rechargeable battery 2
Reference numeral 8 denotes a block for supplying operating power to the load 29.

FIG. 2 is a flowchart showing the main operation of the base unit 11, and FIG. 3 is a flowchart showing the main operation of the sub unit 13. The operation of one embodiment of the present invention will be described below with reference to FIG.

The main control unit 25 operates the voltage control circuit 23 via the charge control unit 26, sends out the output voltage to the base unit charging terminal 14, and checks the output value of the current detection circuit 22. When the output of the current detection circuit 22 indicates that a current is flowing through the base unit charging terminal 14, the slave unit 1
3 is determined to have been returned to the base unit 11. When it is indicated that no current is flowing through the base unit charging terminal 14,
Slave device 13 determines that it has not been returned to master device 11.

When it is determined that the slave unit 13 has not been returned to the master unit 11, the main control unit 25 checks the operation of a wireless communication unit (not shown) and determines whether the slave unit 13 is in the standby state or the communication state. The state of charge is notified to the charge amount calculation unit 24.

The rear main control unit 25 is provided with a DC jack 1
It is checked whether or not the DC voltage is supplied to 6, and if it is, the operation returns to the operation for checking whether or not the slave unit 13 has been returned to the master unit 11. That is, the slave unit 13 is the master unit 1
If not returned to 1, the operations of steps S11 to S13 are repeated.

In the repetitive operation of steps S11 to S13, the charging amount calculating section 24 calculates the total time of the communication time of the handset 13 from the start time and end time of each call every time the handset 13 performs a call. I do. Further, it calculates the time during which the slave unit 13 is in the standby state. The discharge amount of the rechargeable battery 28 is calculated based on these two types of time, and the rechargeable battery 28 is calculated.
Calculate the time required for quick charging for.

It should be noted that the required time is maintained in a standby state even when the slave unit 13 does not make a call.
Since the rechargeable battery 28 is discharged, steps S11 to S11 are performed.
The required time increases as the repetition time of the operation 13 increases.

In the operation of step S11, the slave unit 13
Is determined to have been returned to the base unit 11, the operation moves from step S11 to step S14, and the
The main control unit 2 determines whether it is necessary to send data to
5 is determined. If data transmission is necessary, the operation moves to step S18.

In this step, the main controller 25
Sends data to the slave unit 13 by giving an instruction to the data sending control unit 27 and controlling on / off of a voltage sent to the base unit charging terminal 14 via the voltage control circuit 23.

When the data transmission is completed,
The operation is the operation of step S15. Also, if there is no data to be sent to the slave unit 13 in step S14, the operation of step S15 is similarly performed. In this step S15, the current flowing through the rechargeable battery 28 of the slave unit 13 via the master unit charging terminal 14 is detected, and the detection result is given to the charge control unit 26.

Step S15 and the following operations are charging operations for the rechargeable battery 28. In the following description, reference will be made to the voltage waveforms shown in FIGS. 4 and 5 as necessary.

The charging control unit 26 controls the operation of the voltage control circuit 23 to supply a voltage for charging to the base unit charging terminal 14 (shown by t11 and t13 in FIG. 4; And a non-supply period (t11, t1) during which no voltage is supplied to the base unit charging terminal 14.
The rapid charging or the trickle charging is performed by changing the ratio of the period t1, the period t11, the period t13, the period t13, and the period t14 to the order of ms.

As for the ratio between the on period t11 and the off period t12 in the rapid charging, a plurality of ratios are preset, and when the charging current detected by the current detection circuit 22 is large, the ratio in the rapid charging is reduced. The ratio is selected so as to increase the average current value.

The charge amount calculation unit 24 subtracts the period during which the charge control unit 26 is given a quick charge instruction from the time required for the quick charge calculated based on the discharge amount of the rechargeable battery 28,
When the result of the subtraction becomes 0, it is determined that the charging of the rechargeable battery 28 has been completed, and the charging controller 26 operates to give an instruction for trickle charging to the charging controller 26.

Since the charge controller 26 and the charge calculator 24 operate as described above, the rechargeable battery 28 is rapidly charged with a period corresponding to the amount of discharge of the rechargeable battery 28 and an average current value. After that (steps S16 and S17), trickle charging is performed after the rapid charging is completed (steps S16 and S18). The off period t14 is the same as the current detection circuit 2
2 changes in accordance with the output of the second.

In this charging, since the slave unit 13 needs to be returned to the master unit 11, in this embodiment, the charging operation performed by the charging control unit 26 is as short as about 1/10 second. The operation of steps S11, S14, and S15 is inserted between the repetitions of the short charging period, and it is determined whether the state in which the slave unit 13 is returned to the master unit 11 is maintained. I have.

That is, every time the quick charging or the trickle charging is performed for 1/10 second, it is checked whether or not the slave unit 13 has been returned to the master unit 11, and if it has been returned, the charging is continued.

When the slave unit 13 is taken out of the master unit 11, the charging operation is immediately stopped. Further, the charge amount calculation unit 24 stops subtracting the required time of the quick charge, and increases the required time of the quick charge according to the use state and the use time of the slave unit 13 picked up from the master unit 11.

The operation of the parent device 11 has been described above, and the operation of the child device 13 will be described below.

On the slave unit 13 side, when a voltage is applied to the slave unit charging terminal 15, the transistor Q2 is turned on,
Since the collector voltage becomes a voltage near 0 V, the slave unit 1
When 3 is returned to the base unit 11, when a charging voltage is sent to the base unit charging terminal 14, this is indicated as a voltage change of the collector.

Further, a voltage is periodically sent from the base unit 11 to the base unit charging terminal 14 to check whether or not the slave unit 13 has been returned to the base unit 11.

From the above, when a periodic voltage from master unit 11 is detected, slave unit control unit 31 determines that slave unit 13 has been returned to master unit 11. When the periodic voltage from the base unit 11 is not detected, the slave unit 13
It is determined that it is apart from 1. This determination operation is repeated until the slave unit 13 is returned to the master unit 11 (step S21).

When the slave unit 13 is returned to the master unit 11, it is determined in step S21 that the slave unit 13 has been returned.
The operation moves to step S22.

Now, assuming that the voltage change of the data transmitted from the master unit 11 is indicated by 43 in FIG. 5, the time axis in FIG. 5 is an expanded time axis than that in FIG. In FIG. 5, the short ON period t13 for trickle charging is indicated as a long ON period t13.

The transmission speed of the data indicated by 43 in FIG. 5 is set to be close to 300 kbps, and both the period t16 of the voltage change of the data and the period t15 during which the voltage is supplied are shorter than the period t13. It is a very short period.

Therefore, the judging means 30 judges whether the voltage sent from the base unit 11 is a voltage for indicating data or a voltage for charging by judging the difference between the periods. Then, the determination result is sent to the slave unit control unit 31.

For this reason, the slave unit control section 31
When the output indicates data, the voltage change guided to the child device charging terminal 15 is read as data, and an operation is performed according to the read data (step S2).
3).

When the output of the judging means 30 indicates that the voltage change led to the child device charging terminal 15 is a change for charging, the child device control unit 31 is not involved in this voltage change. The rechargeable battery 28 is rapidly charged or trickle charged with the voltage at this time.

As described above, in the present embodiment, the rapid charging or the trickle charging performed by the charging control unit 26 is performed using the current value (average current value) corresponding to the current value detected by the current detection circuit 22. In order to shorten the time required for quick charging, the charging current changes according to the discharging state of the rechargeable battery 28 even when its current value is increased. Can be prevented from deteriorating.

The present invention is not limited to the above embodiment, and the relationship between the data transmission speed and the ON period or the OFF period has been described in the case where the relationship is between 300 kbps and ms order. Any relationship can be set as long as it is possible to discriminate between the on / off periods of the voltage for data and the on / off periods of the voltage for charging.

The determining operation of the determining means 30 is as follows.
Data cycle t16 and ON period t13 during trickle charge
Although the description has been given only of the case where the comparison is made, the operation of making the determination by comparing the data period t16 or the period t15 with the ON period t12 and the OFF periods t11 and t14 for charging may be performed. .

[0062]

In the cordless telephone according to the present invention, the charging means performs the rapid charging or the trickle charging by changing the ratio of the ON period and the OFF period, and performs each of the ON period and the OFF period. Is controlled to be longer than the period required for transmitting the unit bit of data, and the ON period, OFF period,
Or, based on the length of the ON period and the OFF period, whether the voltage given to the slave unit charging terminal is a charging voltage or a voltage indicating data is determined by the determining unit, and the slave unit charging terminal When the appearing voltage is the voltage indicating the data, since the data is read by the slave unit control unit, the charging circuit for both the quick charge and the trickle charge is shared, so when the quick charge is performed. Also,
There is an effect that data transmission to the slave unit can be performed without inviting the complexity of the charging circuit.

[Brief description of the drawings]

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

FIG. 2 is a flowchart showing main operations of a master unit.

FIG. 3 is a flowchart showing main operations of the slave unit.

FIG. 4 is an explanatory diagram showing waveforms of charging voltages for quick charging and trickle charging.

FIG. 5 is an explanatory diagram showing a relationship between a voltage waveform during charging and a voltage waveform of data.

FIG. 6 is a block diagram showing an electrical configuration of the related art.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 master unit 12 charging means 13 slave unit 14 master unit charging terminal 15 slave unit charging terminal 22 current detection circuit 30 determining means 31 slave unit control unit

Claims (1)

(57) [Claims] A cordless telephone that transmits data from the master unit to the slave unit via a master unit charging terminal provided on the master unit side and a slave unit charging terminal provided on the slave unit side. A period during which a charging voltage is transmitted to the parent device charging terminal or a period during which a charging voltage appears at the child device charging terminal is an ON period, and a period during which no charging voltage is transmitted to the parent device charging terminal or the child device charging terminal. When the off-period is a period during which no charging voltage appears, the master unit controls the on-period and the off-period of the charging voltage to be sent to the main unit charging terminal, so that the rechargeable battery in the slave unit is controlled. Charging means for performing quick charging or trickle charging is provided, wherein the slave unit has an on-period, an off-period of a voltage appearing at the slave unit charging terminal,
Or, based on the length of the on-period and the off-period, a determining means for determining whether the voltage given to the slave unit charging terminal is a charging voltage or a voltage indicating data, A slave unit control unit that reads data based on a change in the voltage that appears at the slave unit charging terminal when the voltage appearing at the slave unit charging terminal is determined to be a voltage indicating data, The cordless telephone according to claim 1, wherein the charging unit controls the on-period and the off-period of the charging voltage transmitted to the base unit charging terminal to be longer than a period required for transmitting a unit bit of the data. .