JPS61122574A - Power source display device - Google Patents

Abstract

PURPOSE:To display how much a dry battery has the remaining capacity for operating equipment with small power consumption by providing many indicators which turn on and off, and allowing up to one of those indicators to illuminate. CONSTITUTION:The equipment body 1 is provided with the indicators, i.e. light emitting diodes 2a-2c and displays 3a-3c showing how much the dry element battery has the remaining capacity for operating the equipment are made corresponding to the light emitting diodes 2a-2c. Only one of the light emitting diodes 2a-2c corresponding to the capacity degree displays 3a-3c is turned on by an electric means according to the capacity of the battery and three of them are turned on unless the battery has enough capacity to operate the equipment. Thus, the degree of the capacity of the battery for operating the equipment is displayed. Further, up to one of those indicators illuminates, so the power consumption of a power source display device is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention operates using a power source (hereinafter represented by a dry battery) that causes a voltage drop as the usage time increases. For example, the present invention relates to a power supply display device for a radio receiver, a tape recorder, etc.

BACKGROUND ART Equipment powered by dry batteries is equipped with a power display device that informs the user of the equipment whether the dry battery has the ability to operate the equipment and how much capacity remains. is common. However, consuming a large amount of power for the power display device unnecessarily shortens the life of the dry battery, which is against the user's interests.

As shown in FIG. 4, the conventional power supply display device includes, for example, one light emitting diode 2 disposed as an indicator in the main body 1 of the device, and lights up when the dry battery has the ability to operate the device. The device may be configured so that the light is turned off when it does not have the above-mentioned ability, or as shown in FIG.
When the dry battery has sufficient ability to operate the device, when it has a moderate ability, and when it has a little ability, the three light emitting diodes are activated in response to each case. Three lights 2&, 2b, and 20, two lights 2&, 2b, and one light 2& are turned on, and when they do not have the above-mentioned ability, all lights are turned off.

Problems to be Solved by the Invention However, in the conventional power display devices shown in FIG. 4 and FIG. There was a problem that power was consumed.

The present invention solves these conventional problems and provides a power display device that can display how much capacity a dry cell battery has left to operate a device with low power consumption.

Means for Solving the Problems The power supply display device of the present invention includes a device provided with a plurality of indicators that turn on or off depending on the voltage of a dry battery, and only one of the plurality of indicators turns on at most. It is configured to do so.

Function: The power supply display device of the present invention has a plurality of indicators, so that it can display how much capacity the dry cell battery has left to operate the device. Further, since only one of the plurality of displays is turned on at most, display can be performed with less power consumption.

Example Embodiments of the present invention will be described below with reference to the drawings.

In the first embodiment, as shown in FIG. 1, a device main body 1 includes indicators such as light emitting diodes 2a and 2b.

A display that shows the level of ability of dry batteries (not shown) to operate the equipment (hereinafter referred to as capacity level display) with three 2C batteries installed.
3a, 3b, 3c are the light emitting diodes 2a, 2b, 2
Display corresponding to c.

The light emitting diodes 21L, 2b are activated by electric means (not shown) depending on the capacity of the dry cell.

Of 2G, 1 corresponds to ability level display 3 &, 3b, 30
Only one of the three lights is turned on, and all three lights are turned off when there is no ability to operate the device.

FIG. 2 is an example of a circuit diagram for realizing the above-mentioned power supply display device. 4 is a dry battery, 21L, 2b.

2C is a light emitting diode, 4&, 4b, 4C is a limiting resistor for limiting the current of the light emitting diode, 5a, 5b
, 5c is a level comparator for turning on or off the light emitting diode as desired, and each has terminals 1 to 5, and the voltage at terminal 1 is +a t ” 1b p
When the voltage E2 at the terminal 2 is higher or lower than E+c, the current flows from the terminals 5 to 4 or from the terminals 3 to 5. Above level comparison 161
Voltage at terminal 1 of L, 5b + 5C 'J & p Klb l
"1° is transistor 6, dividing resistor 71L, 7b
, 70. Feedback resistor 8 and diode 9 connect dry battery 4
Even if the voltage (power supply voltage vcc) changes, it is maintained at a desired constant voltage, and a relationship of "HL>"1b>1C4° is provided. The voltage z2 at the terminal 2 of each level comparator is set by a resistor 10.11 so as to be proportional to the dry battery voltage v0°.

With the above configuration, the dry battery voltage v0°,
Voltage E2 at terminal 2 of level comparator, voltage E at terminal 1, a
,1c,b,Σ,. According to the relationship, light emitting diode 2
2L, 2b, and 20 can be turned on or off as follows to achieve the desired purpose. In other words, when vcc is sufficiently high and "2 > Ela r ElbyE," current flows in the direction of arrow A, and the light emitting diode 21L
only lights up. vo. descends, K, &) N2)
Klb) Hl. (When D, the current flows in the direction of arrow a, and only the light emitting diode 2b lights up. Vcc drops to Kasara, and C", "1a > TLlb > N2
>N1°, the current flows in the direction of arrow C, and only the light emitting diode 2c lights up. vo. The water is falling even further.”
12L>]E,b>Etc>N2, all the light emitting diodes turn off.

FIG. 3 shows a second embodiment of the present invention, which is an example implemented for a device having two or more operating states with different power consumption, in this example a tape recorder. That is, in a tape recorder, power consumption generally differs between playback and recording, and in this case, the degree of ability of the dry cell battery to operate the device differs. In this embodiment, the ability level display 3&, 3b, 3C and 31L' during playback and recording,
3b'.

s c / with the same light emitting diodes 21L, 2b, 2C
It is displayed in accordance with .

Effects of the Invention As described above, the power supply display device of the present invention has a plurality of indicators, and the capacity level is displayed, so that it is possible to display the level of capacity for operating dry cell battery devices. Furthermore, since only one display among the plurality of displays lights up at most, a power supply display device with low power consumption can be obtained.

[Brief explanation of drawings]

FIG. 1 is an external view showing an embodiment of the power display device of the present invention, FIG. 2 is an electric circuit diagram of the same device, and FIG. 3 is a second embodiment of the power display device of the present invention.
FIG. 4 and FIG. 5 are perspective views of conventional power display devices. 1... Equipment body, 21L, 2b, 20...
...Indicator, 3&, 3b, 30, 3a',
3b', 3c' --- ability] Degree display. Name of agent: Patent attorney Toshio Nakao and 1 other person (1)
) Feather 1... Surinen $ stop invitation, 2&+, 2cm Keijubanroku Ushi 3 (...15 sword 1 Yui βIi tZ oral performance 40 '1. S tko

Claims (1)

[Claims] A power supply that causes a voltage drop as the usage time increases,
A power supply display device comprising a plurality of indicators that blink in relation to the magnitude of the voltage of the power supply, and configured such that only one of the plurality of indicators is turned on at most.