JP2867003B2 - Cordless phone cordless charger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charging device for a cordless telephone handset.

[0002]

2. Description of the Related Art There is known a cordless telephone apparatus including a telephone main unit connected to a telephone line and a cordless telephone slave unit wirelessly connected to the telephone main unit.

[0003] In this cordless telephone device, the cordless telephone handset is used independently, and is therefore driven by a battery. Generally, a nickel-cadmium battery is used as the battery, and the battery is charged by a dedicated charger.

[0004] There are a voltage control charging method, a ΔV control charging method, a V taper control method, and the like as a charging method for a nickel-cadmium battery. The ΔV control charging method and the V taper control method are based on problems such as circuit accuracy and cost. It is rarely used in cordless telephone devices, and a voltage-controlled charging method is generally used.

The voltage-controlled charging system monitors the voltage of a battery during charging, and switches to trickle charging to prevent overcharging when the voltage reaches a predetermined voltage indicating a full charge. It has the advantage of being simple.

[0006]

The voltage-controlled charging method has the advantage that the circuit configuration is simple as described above, but has the disadvantage that the voltage value indicating full charge fluctuates due to temperature changes, charging current values, and the like. is there. For this reason, it was difficult to obtain charging stability.

Further, the conventional charging apparatus monitors the terminal voltage of the rechargeable battery and, when the terminal voltage falls below a predetermined value, warns of the necessity of quick charging. Because it is not to monitor, with the battery at that time,
It was not possible to accurately indicate how long it was possible to talk about how long it was possible to talk.

[0008]

In order to solve the above-mentioned problems, a cordless telephone handset according to the present invention is, for example, shown in FIG.
As shown in the figure, the mode management means 1 for managing the operation state of the cordless telephone handset, and the constant current value for charging can be switched to a plurality of values set according to the mode of the cordless telephone handset. Constant current circuit 2 and mode management means 1
And a constant current switching means 3 for generating a constant current value switching signal SW of the constant current circuit 2 and a battery 4 of the cordless telephone handset based on the constant current from the constant current circuit 2 and the charging time.
A charge amount calculating means 5 for obtaining the charge amount of the battery, a consumption amount calculating means 6 for receiving the output of the mode management means 1 and obtaining a battery consumption amount from a current consumption and a use time according to an operation state of the cordless telephone handset; A required charge amount calculating means for calculating a required charged amount of the battery based on the charged amount from the charged amount calculating means and the battery consumption from the consumed amount calculating means is provided.

The mode management means 1 is supplied with a detection output of a detection means 8 for detecting a connection state of the cordless telephone handset to the charger, and a switch for turning on / off the power of the cordless telephone handset. An output corresponding to a switch input of a switch group 9 such as a button switch is supplied.

[0010] Also, a talk time calculating means 10 which receives a necessary charge amount from the charge amount calculating means 7 and calculates a talk time with the cordless telephone handset based on the charge amount, and a talk time calculation means Display means 11 for receiving the output of the means 10 and displaying the communicable time of the cordless telephone handset
Is provided.

[0011]

According to the present invention having the above structure, when the detecting means 8 detects that the cordless telephone handset is connected to the charger, the mode managing means 1 determines that the charging mode is set, and When it is detected that the cordless telephone handset is not connected to the charger, the mode management means 1 determines that it is in the use mode. Then, in response to a switch input of the switch group 9, the mode management means 1 determines an operation state of the cordless telephone handset in the charging mode and the use mode.

The charging current supplied from the constant current circuit 2 to the battery is a constant current. However, the charging current is set to a plurality of constant current values set in advance according to the operation mode of the cordless telephone handset and the state of charge of the battery 4. Can be switched.

The constant current switching means 3 generates an output for selecting a constant current value according to the operation mode based on the output indicating the operation state of the cordless telephone handset from the mode management means 1, and sets the output. The current is supplied to the current circuit 2 to switch the constant current value.

In the case of the example shown in FIG. 1, the charge amount calculating means 5 receives the selected output of the constant current value from the constant current switching means 3 and knows the constant current value of charging. The charge time based on the constant current value is known as the state time, and the charge amount is calculated as (constant current value) × (charge time) = (charge amount). It is also possible to detect the constant current value from the constant current circuit 2 and calculate the amount of charge as the product of this and the connection time of the constant current value.

The obtained charge amount is calculated by a necessary charge amount calculating means 7.
And is subtracted from the required charge amount up to that time.

When the battery is fully charged (the required charge amount is zero), the output of the required charge amount calculation means 7 selects the constant current value at the time of trickle charge by the output of the constant current switching circuit 3. As a result, the battery is in a trickle charge state to prevent overcharging.

When the cordless telephone handset is in the use mode in which the cordless telephone handset is detached from the charger, the consumption calculating means 6 responds to the signal indicating the operation state of the cordless telephone handset identified by the mode management means 1 as follows: Consumption is calculated as (consumption) = (consumption current according to operation state) × (duration of the operation state) and integrated.

Then, this consumed amount is supplied to the required charge amount calculating means 7 and added to the required charge amount. If the required amount of charge exceeds a certain value, an alarm may be issued and the constant current value for charging may be forcibly selected as the constant current value for rapid charging.

Thus, the charge amount and the consumption amount are monitored,
Since the required amount of charge is constantly managed, the charge time management up to full charge can be performed reliably and accurately.

In this case, the communication time calculation means 10 further calculates, from the information on the required charge amount from the required charge amount calculation means 7, for example, (available capacity of the battery) = (when the quick charge is required). The available capacity of the battery is calculated as (required charge amount)-(determined required charge amount), and the talkable time is calculated as (usable capacity / current consumption during talking) = (talkable time). Then, the communicable time is displayed on the display means 11. The display method may be a method of displaying the time as a numerical value or a bar graph display using a plurality of light emitting diodes.

[0021] Since the callable time is displayed in this manner,
The user can make a continuous call with confidence for that time. In addition, if the communicable time is short, it is known that charging is necessary, and it also serves as a charge warning display.

[0022]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a charging device for a cordless telephone handset according to the present invention.

FIG. 2 is a block diagram of an embodiment of the present invention, in which a microcomputer (hereinafter referred to as a CPU) is used for control. In FIG. 2, reference numeral 20 denotes a charger, 21 denotes an AC adapter, and 30 denotes a cordless telephone handset.

The charger 20 has a protection circuit 23 and a smoothing capacitor 24, and is connected to a commercial AC power supply via an AC adapter 21. 25 and 26 are connection terminals between the charger 20 and the cordless telephone handset 30. In the cordless telephone handset 30, reference numeral 31 denotes a wireless circuit unit for exchanging call voice and data with a telephone main unit (not shown) via a wireless channel.

Reference numeral 32 denotes a control circuit which controls the wireless circuit 31 and other controls of the slave 30. A CPU 33 controls the operation of the slave unit 30 according to a program. Reference numeral 34 denotes a keyboard such as a function button, and reference numeral 35 denotes a power on / off switch. Outputs indicating respective operation states are supplied to the CPU 33. 36
Is a liquid crystal display as an example of a display means, which includes a dial number, a time, an operation state of a slave unit (extension call,
In addition to the display of an outside line call, a hold, an incoming call, etc., a display of a possible call time, a warning display indicating the necessity of charging the battery, and the like are performed.

Reference numeral 37 denotes a rechargeable battery such as a nickel-cadmium battery. A constant current circuit 38 supplies a constant current as a charging current to the battery 37. This constant current circuit 38 has a CPU
The constant current value can be changed by the control signal from 33. The constant current value is set in advance in a plurality of ways according to the operation state of the slave unit 30 and the state of charge of the battery 37 as described later.

Reference numeral 39 denotes a charging current detection circuit. When handset 30 is connected to charger 20 at connection terminals 25 and 26, battery 37
The charging current detection circuit 39 detects the charging current, and supplies a signal to the CPU 33 indicating that the slave unit 30 is connected to the charger 20 and is being charged.

The constant current value of the constant current circuit 38 is set as follows. (1) In case of quick charge (1) -a Power switch is off and slave unit is not operating (quick charge current) + (quiescent circuit current) = (constant current value A) (1) -b Rapid charging while performing intermittent reception (rapid charging current) + (circuit current during intermittent reception) = (constant current value B) Here, intermittent reception in standby means a non-operating state and whether or not received data exists. This is an operation mode in which the intermittent reception state in which the radio circuit unit 31 is operated to detect the state is alternately performed every minute time. The charging current in the non-operating state of the intermittent reception at the time of the quick charging is equal to the constant current value A. (2) In the case of steady charging other than quick charge (2) -a Non-operating state of intermittent reception (charge current at intermittent reception) + (circuit current at rest) = (constant current value C) (2) -b intermittent During intermittent reception (charging current during intermittent reception) + (circuit current during intermittent reception) =
(Constant current value D) (3) In case of trickle charge after full charge (3) -a Non-operating state of intermittent reception (trickle charge current) + (quiescent circuit current) = (constant current value E) (3) -b Intermittent reception during intermittent reception (trickle charging current) + (intermittent reception circuit current) = (constant current value F) (4) Incoming call (trickle charging current) + (incoming reception circuit current) = ( Constant current value G) The above constant current value can be reduced or increased in type depending on conditions such as charging time and circuit current.

The CPU 33 identifies the above operation state and supplies a constant current switching signal to the constant current circuit 38. Then, the CPU 33 measures the time of each charge state, and calculates the charge amount as (charge constant current value) × (time) = (charge amount).

The required charge amount is set in the CPU 33. When the battery is empty, the maximum required charge is set. When charging is performed, the calculated charging amount is subtracted from the required charging amount.

When the slave unit 30 is detached from the charger 20 and used, the battery is consumed. The modes in use include a call, an intermittent reception, an incoming call, a power-off, and an operation stop state. However, since the current consumption in each mode is determined, the CPU 33 determines the use time in each mode. By measuring, the battery consumption is calculated as (current consumption in use mode) x (time) = (battery consumption). Then, this battery consumption is added to the required charge. At the time of this addition, a process of converting the battery consumption into an additional required charge is performed. For example, in the case of a battery having a capacity of 400 mAH, the battery will not be fully charged unless it is charged at 600 mAH.

Then, a charge loss coefficient (1.5 in the above example) is obtained as (maximum required charge amount / capacity) = (charge loss coefficient), and (battery consumption amount) × (charge loss coefficient) = (additional required charge amount) ). Then, a process of adding the obtained additional required charge amount to the required charge amount is performed.

In this case, when the required charge amount becomes a predetermined value TH slightly smaller than the maximum required charge amount in view of a margin, a warning display for warning that the battery 37 is almost empty is displayed on the liquid crystal display 36. Make in.

When the user connects the cordless handset 30 to the charger 20, a constant current value switching signal for selecting the constant current value A or B at the time of rapid charging is supplied from the CPU 33 to the constant current circuit 38, thereby forcibly. Is in a state of quick charge.

When the required charge amount is zero, that is, when the battery is fully charged, the constant current value switching signal from the CPU 33 selects a constant current value during trickle charging.

The CPU 33 manages the charging time while monitoring the required charging amount as described above.

Further, the CPU 33 calculates the remaining capacity from the required charge amount by the following calculation: (maximum required charge amount) − (current required charge amount) = (remaining capacity), and (remaining capacity) ÷ (current consumption during a call) The chargeable time is obtained by the calculation of (charge loss coefficient) = (communicable time). Then, the available call time is displayed on the liquid crystal display 36.

A plurality of light emitting diodes are arranged in a line, and when the battery is fully charged (the required charge amount is zero), all of the light emitting diodes are turned on. By sequentially turning off the light emitting diodes corresponding to the number from the end, it is possible to visually display the battery consumption state. This display
It also indicates that a telephone call is possible in accordance with the number of lighted light emitting diodes.

The talkable time can be determined by detecting the voltage of the battery, and the display can be performed by a liquid crystal display or a plurality of light emitting diodes.

FIGS. 3 to 5 are flowcharts showing an example of the charging control in the CPU 33. Hereinafter, the charging control operation will be further described with reference to this flowchart.

First, it is determined whether or not the child device 30 is connected to the charger 20 (step 101). If it is determined that the cordless handset 30 is not connected to the charger 20, the cordless handset is in the cordless handset use mode, and the process proceeds to step 102, where it is judged whether the power is on or off.

If the power is on, the use state of the slave 30 is identified (step 103). As a result of the identification, in this example, the standby state (step 104), the outgoing call, the call state (step 105),
One of the incoming states (step 106) is identified. Then, the usage time in the identified state is measured (steps 107, 108, 109). When the end of the use state is detected (steps 110, 111, 112), the battery consumption in the use state is calculated (steps 113, 114, 115).
Next, the calculated battery consumption is converted into an additional required charge and added to the required charge (step 116).

If it is determined in step 102 that the power is off, a battery save mode is entered (step 117), the duration of this mode is measured (step 118), and the end of this mode is detected (step 119). ), The battery consumption in this mode is calculated (step 120), and then the routine proceeds to step 116, where the battery consumption is converted into an additional required charge and added to the required charge. After the end of step 116, the process returns to step 101. If it is determined in step 101 that the slave unit 30 is connected to the charger 20, the charging mode is set, and the process proceeds to step 121 to determine whether the power is on or off. If the power is on, the state of the slave 30 is checked (step 122). If the slave 30 is in the standby reception state (step 123), the required charge amount at that time is checked (step 124).

As a result of the check in step 124, when the required charge amount exceeds the predetermined value TH and the charge is set to a certain value or less (step 125), the charge current from the constant current circuit 38 is changed to the constant current values A and B. Is set in response to the standby reception (step 12
6). The duration of the state is measured (step
127), the charge amount is calculated (step 128). Then, the charged amount is subtracted from the required charged amount (step 129).

As a result of the check in step 124, when the required charge amount is equal to or less than the predetermined value TH and the charge is equal to or more than a predetermined value (step 130), the charging current is set to the constant current values C and D in standby reception. (Step 131). afterwards,
Proceeding to step 127, after the duration of the state is measured, the charge amount is calculated, and the obtained charge amount is subtracted from the required charge amount (steps 128, 129). When step 129 ends, the process returns to step 101.

As a result of checking the required charge amount in step 124, it is determined that the charging is completed and the battery is fully charged (step 13).
2), the charging current is set to constant current values E and F at the time of trickle charging in response to the standby reception (step 133).
Return to 101.

As a result of checking the state of the slave unit 30 in step 122, when it is determined that an incoming call is being received (step 134), the constant current value G is set (step 135).
Return to 1.

If it is determined in step 121 that the power is off, the flow advances to step 136 to determine whether or not charging has been completed. If it is determined that the charging is not completed, the charging current is set to the constant current value A (step 137), the duration of the state is measured (step 138), and the charge amount is calculated and obtained (step 138). 139). Then, the process proceeds to step 129, where the charged amount is subtracted from the required charged amount.

When it is determined in step 136 that the charging is completed, the routine proceeds to step 140, where the constant current value E is set, and then the routine returns to step 101.

[0050]

According to the present invention, while managing the state of the cordless telephone handset, the charge and consumption of the battery are constantly monitored and calculated, and these are subtracted from and added to the required charge. By doing so, the required amount of charge at the current time can always be detected. Therefore, time management until a full charge can be performed accurately, reliably, and easily. In addition, it can be easily detected that the charge has become equal to or less than a predetermined value from the required charge amount, and a charge warning display can be reliably performed.

Further, it can be easily and reliably detected that the charge has become equal to or less than a predetermined value from the required charge amount, and the alarm display of the charge can be reliably performed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an outline of a charging device for a cordless telephone handset according to the present invention.

FIG. 2 is a block diagram of an embodiment of a charging device for a cordless telephone handset according to the present invention.

FIG. 3 is a part of a flowchart for explaining the operation of the charging device of the cordless telephone handset according to the present invention.

FIG. 4 is a diagram showing a part of a flowchart for explaining the operation of the charging device of the cordless telephone handset according to the present invention.

FIG. 5 is a diagram showing a part of a flowchart for explaining the operation of the charging device for a cordless telephone handset according to the present invention;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Mode management means 2, 38 ... Constant current circuit 3 ... Constant current value switching means 4, 37 ... Rechargeable battery 5 ... Charge amount calculation means 6 ... Battery consumption amount calculation means 7 ... Required charge amount calculation means 11 ... Display means 36… Liquid crystal display

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kozo Kobayashi 1-6-1, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Takeo Saito 1-16-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan (56) References JP-A-60-235538 (JP, A) JP-A-53-49233 (JP, A) JP-A-55-131240 (JP, A) (58) Fields investigated ( Int.Cl. ⁶ , DB name) H04M 1/00 H04B 7/26 H02J 7/00-7/36

Claims (1)

(57) [Claims] 1. Charging is possible while performing intermittent reception of standby
A mode management means for managing the status of the cordless telephone handset such, the constant current value for charging the rechargeable battery built in the cordless phone extension master station has been set in accordance with the state of the cordless telephone handset A constant current circuit capable of switching to a plurality of values; and a state of the cordless telephone handset from the mode management means.
Receiving an output indicative of the condition, the constant current switching means for generating a switching signal of the constant current value of the constant current circuit, the charging current value determined by the constant current circuit, the charge
A charge amount calculating means from the charging time is the duration of the state of DENDEN current value determining the amount of charge of the rechargeable battery of the cordless telephone handset Zhou of the cordless telephone handset from the mode managing unit
Receiving the output indicating the state, the consumption current value according to the state of the cordless telephone handset, and the consumption time calculating means for calculating the battery consumption from the usage time that is the duration of the state; and management and charge amount, based on the consumed amount from the consumption amount calculating means and a required charge quantity calculating means for calculating a required amount of charge in the rechargeable battery, the required charging time based on the required amount of charge Cordless telephone cordless handset charging device.