JPH07321731A - Battery capacity display device for electric appliance - Google Patents

Abstract

PURPOSE:To provide a display device in which a battery capacity display function is not lost without provision of power on/off switch. CONSTITUTION:The electric appliance provided with an integration arithmetic means 23 using a chargeable battery 14 for an operation power supply and integratingly calculating the battery capacity of the battery, a display means 2 displaying the battery capacity of the battery integratingly calculated by the integration arithmetic means and a charge detection means 18 detecting it that the appliance is placed on a charger 16, a control means 19 in which the electric appliance is set to the test mode by the operation of a prescribed key 5 and a circuit section except part of the electric appliance is inactivated by operating a prescribed switch 10 in the test mode, and the control means 19 is used to restore the operation of each circuit section of the electric appliance when the charge detection means detects it that the electric appliance is placed on the charger 16 while the circuit section except part of the electric appliance is inactivated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery capacity display device for an electric device such as a cordless telephone handset.

[0002]

2. Description of the Related Art Conventionally, as shown in FIG. 6, there is known a cordless telephone having a display unit for displaying the battery capacity of a rechargeable battery incorporated in a handset 1.

In FIG. 6, reference numeral 2 is a display means such as a liquid crystal (L
(CD) display unit for displaying battery capacity, call time, etc., 3 is a call key, 4 is an end key, 5 is a key input unit including dial keys, 6 is a call time call key, and 7 is a speaker unit. , 8 is a microphone unit, 9 is an antenna, 10 is a ringer on / off switch for selecting whether to ring a ringer (ring tone), 11 is a power on / off switch, 12 is a volume switching switch, and 13 is a channel scan switch.

[0004]

However, the cordless telephone handset 1 shown in FIG. 6 uses the power on / off switch 11 in order to suppress battery consumption. Therefore, when this switch 11 is turned off, the cordless telephone It will be completely turned off as a child machine. That is, the microcomputer and the like are also in a non-operating state. Therefore, when a volatile memory is used, the stored contents of the memory are lost. For example, when the battery capacity is cumulatively calculated by the cumulative calculation means of the microcomputer and stored in a volatile memory, the storage of the battery capacity (remaining amount) is indeterminate each time the power on / off switch is turned off. However, there is an inconvenience that the display function of the battery capacity cannot be used. For this reason,
Expensive non-volatile memory had to be used.

Further, as shown in FIG. 6, the power on / off switch 11
If the switch 11 is turned off by the user, if it is left as it is, it cannot be used as a cordless telephone handset. That is, there is an inconvenience that even when there is an incoming call, the child device cannot notify.

Further, even if a user who purchases the cordless telephone slave unit 1 of FIG. 6 does not know the existence of the power on / off switch 11 and tries to operate the cordless telephone with the power on / off switch 11 turned off, the cordless phone does not operate at all. Therefore, it could cause complaints.

[0007]

SUMMARY OF THE INVENTION In view of the above points, the present invention has an object of not providing a power on / off switch and not impairing the capacity display function of a battery. A battery is used as an operating power source, an integration calculation unit that integrates and calculates the battery capacity of the charging battery, a display unit that displays the battery capacity of the charging battery that has been integrated and calculated by the integration calculation unit, and a battery mounted on the charger. In an electric device provided with a charging detection means for detecting the electric device, the electric device is set to a test mode by operating a predetermined key, and a predetermined switch is operated in the test mode to operate the electric device. A control means is provided for disabling a circuit part except a part of the electric device, and the electric device is placed on the charger with the circuit part excluding the part of the electric device being inoperative. Charge inspection When detected by the means, characterized by being configured so as to return the operation of each circuit portion of the electric device by the control means.

Further, the predetermined switch is a ringer on / off switch.

Further, a part of the electric equipment is characterized by an integration calculation means, a charge detection means, and a control means.

[0010]

According to the above construction, a part of the slave unit is removed by operating a predetermined switch, for example, a ringer on / off switch after completion of all inspections during the production of the slave unit of the electric device such as a cordless telephone in the test mode. When the circuit unit is made inoperative and then the slave unit is placed on the charger, the operation of each circuit unit of the slave unit returns to the normal state, so that the consumption of the battery built in the slave unit can be suppressed.

Further, since the integration calculation means, the charge detection means, and the control means, which are a part of the slave unit, do not become inoperative, the battery capacity display function is not impaired.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention used for a cordless telephone handset will be described below.

FIG. 1 is an external front view of a cordless telephone handset. In FIG. 1, the same parts as those in FIG. 6 are designated by the same reference numerals as those in FIG. 6 and their description is omitted.

In FIG. 1, the power on / off switch 1 of FIG.
1 is not provided. Other configurations are the same as those in FIG.

FIG. 2 is a circuit block diagram of a cordless telephone slave unit and a charger.

In FIG. 2, 14 is a rechargeable battery such as a Ni-Cd battery, and 15 is a first charging terminal connected to the positive and negative electrodes of the battery 14. Reference numeral 16 denotes a charger including a circuit for rectifying and smoothing a commercial AC power source and converting it into a DC power source. By mounting the slave unit 1 on the charger 16, the second charging terminal 17 of the charger 16 and the slave unit 1 are installed. The first rechargeable battery 15 contacts the first rechargeable battery 15 and the rechargeable battery 14 is charged through the charger 16 and the rechargeable terminals 17 and 15. Reference numeral 18 is a charge detecting means for detecting that the slave unit 1 is placed on the charger 16 (for example, when the slave unit 1 is placed on the charger 16 and outputting a low level signal for detection), 24 is a charge detecting means. It is a voltage detection unit that detects the voltage across the battery 14. Reference numeral 19 is a control means for controlling the entire slave unit, for example, a microcomputer, which includes a central processing unit 20, a volatile memory 21, an IO port 22, and the like. 23
Is an integration calculation means for integrating the capacity of the battery 14, and the battery capacity calculated by the integration calculation means is displayed on the display unit 2. 25 is a receiving circuit unit, 26 is a transmitting circuit unit, 27
Is a power supply control circuit section.

The operation of the cordless telephone handset 1 thus constructed will be described.

The capacity of the battery 14 is displayed on the display unit 2 based on the integrated calculation result of the integrated calculation means 23.

That is, if the result of the integration calculation by the integration calculation means 23 is 90 mAh or less, only the segment 2b is turned on. Similarly, the result of integration calculation is 90 mAh to 140 m
If it is Ah, the segments 2b and 2c will light up, and
If mAh to 180 mAh, the segments 2b, 2
If c and 2d are lit and the current is 180 mAh or more, the segments 2b, 2c, 2d and 2e are lit. Also, the battery 14
When the voltage detector 24 detects that the voltage of the battery has dropped below a predetermined value, only the segment 2a lights up and the battery 14
Informs that the voltage of is decreasing.

Next, the operation for shifting the handset 1 to the test mode, the operation for disabling the circuit parts except a part during the test mode, and the operation for canceling the power mode and returning to the normal mode The operation will be described with reference to FIGS.

FIG. 3 is a flow chart for explaining the operation when shifting the slave unit to the test mode. In FIG.
When the battery 14 is inserted into the slave unit 1, initial processing is performed, and it is determined whether or not the key is operated (step 1). If the key is not operated, the normal processing is performed. When the dial keys "1" and "9" are simultaneously pressed (step 2), the mode is shifted to the test mode.

FIG. 4 is a flow chart for explaining the operation when the circuit parts except a part are made inoperative during the test mode. In FIG. 4, it is judged whether or not the key is operated during the test mode (step 3). If the key is not operated, the test mode is continued. If the key is operated,
It is determined whether the key is the ringer on / off switch 10 (step 4). If the operated key is the ringer on / off switch 10, the state before the operation of the ringer on / off switch 10 is judged (step 5), and if the pre-operation ringer on / off switch 10 is off, that is, the ringer on / off switch 10 is turned on. When switched from off to on, the power off mode is entered.

However, in the power-off mode in this case, not all the circuit parts of the handset 1 are inoperative, but the microcomputer 19 is in the low power consumption mode and is a part of the handset 1. The battery capacity integration calculation means 23 and the charge detection means 18 continue to operate.

When the product is shipped from the factory, it is shipped in the power-off mode.

FIG. 5 is a flow chart for explaining the operation when canceling the power off mode and returning to the normal mode. In FIG. 5, when the charging detection means 18 detects that the slave unit 1 is placed on the charger 16 during the power-off mode, that is, the user turns on the power of the charger 16 and the charger 16 When the slave unit 1 is mounted on the power supply unit 16, the power off mode is released and the normal mode is set.

Since the battery capacity integration calculating means 23 is operating during the power off mode, the capacity of the battery 14 is correctly displayed on the display unit 2 even when the power off mode is released.

Further, in the above-mentioned embodiment, the charger 16 is shown as an independent one, but it may be formed integrally with the base unit (not shown) of the cordless telephone.

Further, in the above embodiment, an example in which the cordless telephone is used as a cordless handset is explained, but the present invention can be applied to other electric equipment using a rechargeable battery.

[0029]

According to the present invention, a part of the electric device is operated by operating a predetermined switch, for example, a ringer on / off switch, after all the inspections are completed in the test mode of the electric device, for example, during the production of the cordless telephone handset. When the slave unit is placed on the charger after the circuit units except for are disabled, the operation of each circuit unit of the slave unit returns to the normal state, so that battery consumption can be suppressed.

Further, since the integration calculation means, the charge detection means, and the control means, which are a part of the electric equipment, are set so as not to be in an inoperative state, the battery can be operated without using an expensive non-volatile memory. It does not impair the capacity display function.

[Brief description of drawings]

FIG. 1 is a front view showing the external appearance of a cordless telephone handset using a battery capacity display device of the present invention.

FIG. 2 is a circuit block diagram of a slave unit and a charger of a cordless telephone using the battery capacity display device of the present invention.

FIG. 3 is a flowchart illustrating an operation when a cordless telephone handset using the battery capacity display device of the present invention is shifted to a test mode.

FIG. 4 is a flowchart for explaining the operation of the cordless telephone handset using the battery capacity display device of the present invention when the circuit parts except a part thereof are made inoperative during the test mode.

FIG. 5 is a flowchart illustrating an operation when the power-off mode of the cordless telephone handset using the battery capacity display device of the present invention is released and returned to the normal mode.

FIG. 6 is a front view showing the external appearance of a cordless telephone handset using a conventional battery capacity display device.

[Explanation of symbols]

 1 cordless telephone handset 2 display unit (display unit) 5 key input unit 10 ringer on / off switch 14 rechargeable battery 16 charger 18 charge detection unit 19 control unit 23 integration calculation unit

Claims (3)

[Claims] 1. An integration calculation means for integrating and calculating the battery capacity of the rechargeable battery using a rechargeable rechargeable battery as an operating power source.
Operation of a predetermined key in an electric device including display means for displaying the battery capacity of the rechargeable battery integrated and calculated by the integration calculation means, and charge detection means for detecting that the battery is placed on a charger And a control means for setting the electric device to a test mode and operating a predetermined switch during the test mode to inactivate the circuit part except a part of the electric device. When the charging detection means detects that the electric device is placed on the charger in a state in which the circuit parts except the parts are inoperative, the control means controls the circuit parts of the electric devices. A battery capacity display device for an electric device, which is configured to restore operation. 2. The battery capacity display device for an electric device according to claim 1, wherein the predetermined switch is a ringer on / off switch. 3. The battery capacity display device for an electric device according to claim 1, wherein a part of the electric device is an integration calculation means, a charge detection means, and a control means.