JPS63170713A - Electronic apparatus - Google Patents

Abstract

PURPOSE:To enable an operator to always recognize whether the remaining capacity of a battery exists or not, by judging the remaining capacity of the power source in accordance with the change of the detection value of the voltage which is generated at the time of applying a momentary load to the power source by a momentary load means. CONSTITUTION:In the case of check of the remaining capacity of a battery 2, a check signal is supplied from an apparatus body 10 to turn on a transistor TR 7 through a CPU 1A. It is judged whether the battery 2 is in the discharge initial state or in a discharge close state in accordance with the voltage drop value supplied from an A/D converter 3 to the CPU 1A, and this voltage drop value is displayed on a display part 4. Thus, the operator recognizes whether the battery is in the discharge close state or not.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to electronic equipment, and particularly to electronic equipment that has a memory or the like in which data and programs to be read are stored and that requires monitoring of remaining battery capacity. Regarding electronic equipment.

[Conventional technology]

Conventionally, in electronic devices that use this type of battery as a power source,
We check whether the voltage is maintained under the load conditions of normal use, but since batteries generally have discharge characteristics as shown in Figure 2, this has not been done until now. It is difficult to judge whether the battery is in the initial discharging state immediately after charging, as shown by ■ in this figure, or in the final discharging state, as shown by ■, by only checking the battery's remaining capacity. It was difficult to confirm.

[Problem that the invention seeks to solve]

Therefore, by continuing to use an electronic device without knowing when the battery is running out of capacity, there is a risk that the device may suddenly run out of capacity midway through, causing the device to malfunction or stop functioning, leading to interruptions in business operations.

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic device that eliminates the above-mentioned conventional drawbacks, allows the operator to always recognize whether there is a remaining battery capacity, and can be used with peace of mind.

[Means for solving problems]

In order to achieve such an object, the present invention uses a battery as a thunderbolt and is an electronic device driven by voltage applied from a power source. The present invention is characterized by comprising means for determining the remaining capacity of the power supply based on a change in a detected voltage value generated when an instantaneous load is applied to the power supply by the load means.

[Function] According to the electronic device of the present invention, the operator can simply operate the instantaneous discharge means as needed, and the voltage detection means can read the voltage drop caused by the load fluctuation at that time.
Based on the amount of voltage drop, it can be determined whether the battery is in the early stage of discharge or in the final stage of discharge, and appropriate measures can be taken.

〔Example〕

Embodiments of the present invention will be described in detail and specifically below based on the drawings.

FIG. 1 shows one embodiment of the present invention, where 1 is a main unit constituting the main part of an electronic device that includes a central processing unit CPUIA, a storage device ROMIB in which a control program is stored, and a timer IC. It is a circuit part, 2 is a battery,
Reference numeral 3 denotes an A/D converter for supplying the measured voltage value to the main circuit section 1 and displaying the voltage on the display section 4. Therefore, in this example, an instantaneous load circuit 5 is provided in parallel with the A/D converter 3, and a resistor 6 and a switching transistor 7 are provided in this load circuit 5 as means for instantaneously increasing the battery load. . 8 is a switching transistor 7
A signal line 9 supplies a signal to the base of the transistor 7, and unless an on signal is supplied to the signal line 8 from the device body 10 via the main circuit 1, the transistor 7
is kept off.

In an electronic device configured in this way, when it is desired to check the remaining battery capacity, a check signal is supplied from the device main body 10 to turn on the transistor 7 via the CPUIA. It is possible to determine whether the battery 2 is in the initial discharge state or the final discharge state from the voltage drop value supplied from the A/D converter 3 to the CPtJ, and further display the voltage drop value on the display unit 4. .

In other words, as explained earlier with reference to Fig. 2, if the load instantaneously increases by a certain value in the initial state of discharge, the voltage drop value is, for example, 0, IV, whereas in the final state of discharge In the case of (■), the voltage drop in the terminal state is sudden, as the voltage drop value is 0.2■ for the same instantaneous load.
It is possible to make a judgment in the PUIA, and based on such judgment, the operator can be made aware of whether the battery is in the final stage of discharge or not.

Next, based on FIG. 3, a procedure for detecting the remaining battery capacity by the electronic device of the present invention will be described. Here, first in step Sl, when a signal is output to the signal line 8, a predetermined time is measured by the timer IB in step S2, and when the predetermined time has elapsed, step S
Step 3 goes to step 10 where information regarding the voltage drop is read from the converter 3.

Thus, the above information is compared with the reference value in step S4, and the result is displayed on the display section 4 in step S5.

〔Effect of the invention〕

As described above, according to the present invention, a means for detecting a voltage value, for example, an A/D converter, and an instantaneous discharge means are provided, and information regarding the voltage drop that occurs when the instantaneous discharge means is operated. Since the input is sent to the CPU from the A/D converter, it becomes possible for the operator of the device to easily recognize whether the battery is in the initial stage of discharge or in the final stage of discharge.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of the configuration of the battery remaining amount detection means according to the electronic device of the present invention, FIG. 2 is a characteristic curve diagram showing an example of battery discharge characteristics, and FIG. 3 is a battery remaining amount detection according to the present invention. It is a flowchart which shows the procedure. 1... Main circuit section, IA... cpu. 1B...ROM. IC...Timer, 2...Battery, 3...A/D converter, 4...Display section, 5...Momentary load circuit, 6...Discharging load, 7...Switching Transistor, 8...signal line, 10...electronic device (main body). Figure 1 Figure 2 Figure 3

Claims (1)

[Scope of Claims] An electronic device using a battery as a power source and driven by an applied voltage from the power source, comprising: means for detecting the voltage of the power source; means for applying an instantaneous load to the power source; and the instantaneous load means. and means for determining the remaining capacity of the power source based on a change in the detected voltage value that occurs when the instantaneous load is applied to the power source.