JPS59109875A - Recognizing device of residual of battery capacity - Google Patents

Abstract

PURPOSE:To attain a residual storage means which recognizes that the higher the rise extent of voltage, the smaller the residual of a battery capacity by providing a current supply means, which supplies a relatively large current to a battery when a check switch is operated, and a detecting means of the variation of voltage rise of a terminal voltage. CONSTITUTION:When a switch 3 for check is closed, a battery 1 is charged momently by a current supply circuit 2. A variation DELTAV of momentary voltage rise of the battery terminal voltage at this time is detected by a voltage rise detecting circuit 4, and the residual of the battery capacity is recognized and displayed by a residual recognizing display circuit 5 which recognizes that the residual of the electric capacity is less according as the detected DELTAV is higher. Thus, since it is unnecessary to discharge a part of the battery capacity when the residual of the battery capacity is detected and the current used for detection is charged to the battery, the detecting operation is performed efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a remaining battery capacity recognition device for use in battery-powered appliances such as emergency lights and electric shavers, which is capable of recognizing how much remaining battery power can be used.

Conventionally, for example, as disclosed in Japanese Patent Application Laid-open No. 55-88534, a large dummy load is applied to a battery, and after a certain period of time has elapsed since the dummy load is applied, the voltage at the terminals of the battery or the current flowing through the load is reduced. A device has been proposed that recognizes the remaining capacity of a stain pond by detecting it. However, in such conventional examples, a part of the battery capacity is supplied to a comparatively large pseudo load;
This has the disadvantage of wasting battery capacity, and if the remaining capacity is detected many times, the battery that was usable before detection may become unusable due to discharge during the detection operation. There was an inconvenience.

The present invention has been made in order to solve these problems of the conventional example. It is an object of the present invention to provide a remaining battery capacity recognition device that can efficiently recognize the remaining battery capacity without wasting a part of the battery capacity as in the conventional example.

The structure of the present invention will be explained below with reference to illustrated embodiments. 1st
The figure is a block diagram showing the basic configuration of the present invention. In the figure, (1) is a battery, (2) is a current supply circuit, and when the check/null switch (3) is closed, the battery fl) is instantaneously charged from the current supply circuit (2). . The instantaneous voltage increase change ΔV of the battery terminal voltage at this time is detected by the voltage increase detection circuit (4),
The remaining battery capacity is recognized and displayed by the remaining battery capacity recognition and display circuit (5) which recognizes that the larger the detected ΔV is, the smaller the remaining battery capacity is. FIG. 2 is a block diagram showing an embodiment of the present invention that further embodies the principle diagram described above, and FIGS. 3(a) to (1) are operational waveform diagrams of the same. In Fig. 2, (6) is a monostable multivibrator, and when the switch (3) is operated, the signal (Fig. 3 (a)) causes the monostable multivibrator to vibrate -9 (6).
is what is triggered. When the monostable multivibrator (6) is tripped, it generates an output signal as shown in FIG. (
7) and (8) are reset.

Further, at the falling timing t2 of this output signal, the monostable multivibrator (9) at the next stage is tri-inputted. The peak hold circuit (7) is in operation only while the output signal (Fig. 3 (C)) of the monostable multivibrator (9) is output, and the terminal voltage of the battery (1) during this period is In other words, it holds the value, that is, stores it in memory.

At the falling timing t3 of the output signal of Mataco's monostable multipipe 9 (9), the final stage monostable multivibrator (lO) is busy being tri-powered. The output signal (Fig. 3 (d)) of the final stage monostable multivibrator (10) serves as the charging current supply No. 48 to the battery (1), and the battery is charged only while this output signal is output. fl is charged through the load of the device using the battery. FIG. 3(h) shows the charging current waveform at this time, and FIG. 3(i) shows the change in battery voltage at this time. However, monostable multivibrator (10)
While the output signal is being output, the peak hold circuit (8) is in operation and holds, that is, stores and stores the peak value of the terminal voltage of battery +1+. The peak values stored and held in each peak hold circuit tel t8) are input to the differential amplifier (I+), and the difference between the peak values is calculated. 3(e) and 3(f) respectively show the output voltage waveforms of the same hold circuits f71 and T81, and FIG. 3(g) shows the output of the differential amplifier (11). Therefore, the output of the differential amplifier (11) is DC amplifier 0.
2) is increased by I14 and displayed by the meter (13). Figure 4 shows the remaining battery capacity (mAh
) and the voltage increase change ΔV of the battery voltage during instantaneous charging. As shown in the figure, the smaller the remaining battery capacity, the smaller the voltage increase change ΔV. Therefore, the scale of the meter is set at irregular intervals so that the remaining battery capacity can be displayed based on the voltage increase change ΔV, based on the relationship shown in FIG. As an alternative means of displaying the remaining battery capacity, a meter (13
), for example, the output of the differential amplifier (I2) can be converted to an A/D
f converter for digital display, or a differential amplifier (
The output of I2) may be compared with multiple reference levels and LEDs at several levels may be selectively turned on depending on the comparison result. The battery (1) whose battery capacity is detected by the device of the present invention is, in principle, a rechargeable secondary battery, but it can also be applied to dry batteries to some extent.

The present invention is configured as described above, and includes a current supply means for supplying a relatively large current to a battery when a check switch is operated, and a voltage increase detection unit that detects an increase in terminal voltage of the battery in this current supply means. and remaining capacity recognition means that recognizes that the larger the detected voltage increase is, the smaller the remaining battery capacity is. There is no need to discharge the battery, and since the current used for detection is charged into the battery, detection can be performed efficiently.Also, even if the check switch is operated frequently, only a portion of the battery capacity is used as in the conventional case. This has the advantage that since the battery A is never discharged, the battery will not become unusable due to the detection of the remaining capacity of the battery A.

[Brief explanation of drawings]

Figure 1 is a schematic configuration diagram showing the principle of the present invention, Figure 2 is a block diagram of an embodiment of the present invention, Figure 3 is an explanatory diagram of the same operation as above, and Figure 4 is the remaining battery capacity and voltage rise. It is a figure which shows the relationship with a change amount. (1) is a battery, (2) is a current supply circuit, (3) is a switch, (4) is a voltage increase detection circuit, and (5) is a remaining amount recognition and display circuit. Agent Patent Attorney Ishi 1) Chief Figure 1 Figure 2 Figure 3 (0) (e)“

Claims (2)

[Claims] (1) Current supply means for supplying a relatively large current to the battery when the check switch is operated, voltage increase detection means for detecting the increase in terminal voltage of the battery when this current is supplied, and the detected voltage increase. A remaining battery capacity recognition device comprising a remaining capacity recognition means for recognizing that the larger the remaining battery capacity is, the smaller the remaining battery capacity is. (2) The voltage increase detection means includes a first peak hold circuit that stores and holds the peak value of the terminal voltage of the battery within a certain period immediately before the current supply by the current supply means; The claimed invention comprises a second peak hold circuit that stores and holds the peak value of the terminal voltage of the battery, and a differential amplifier that receives the outputs of the first and second peak hold circuits as inputs. The remaining battery capacity recognition device according to scope 1.