KR100686799B1 - Remain capacity display device of battery pack for cellular phone - Google Patents

Abstract

A remaining capacity display device of a battery pack for a cellular phone is provided to quickly check the current remaining capacity by a configuration installed in the battery pack itself even without using a separate external remaining capacity display device or combining the battery pack separated from a portable electronic instrument with a separate charger. A battery's remaining capacity display(120) comprises as follows. At least one voltage sensor(121) senses a battery voltage in case that a switch(110) is on. At least one voltage comparator(122) outputs a predetermined electric signal if the voltage of the sensor(121) is higher than a reference voltage. At least one switch element(123) is on to apply power of a battery if a predetermined signal is inputted from the comparator(122). One luminous element(124) emits light of predetermined color by an on signal of the switch element(123). The one luminous element is a multicolored LED(Light Emitting Diode).

Description

Remaining capacity display device of battery pack for cellular phone}

FIG. 1A is a plan view illustrating an example of a remaining capacity display device of a battery pack for a mobile phone according to the present invention, and FIG. 1B is a cross-sectional view taken along the line 1b-1b of FIG. 1A.

2 is a circuit diagram illustrating a remaining capacity display device of a battery pack for a mobile phone according to the present invention.

3 is another circuit diagram illustrating a remaining capacity display device of a battery pack for a mobile phone according to the present invention.

FIG. 4 is a schematic diagram illustrating a signal input state when three primary color light emitting diodes are used in the remaining capacity display device of the battery pack for a mobile phone according to the present invention.

FIG. 5 is a flowchart illustrating an operation procedure of the remaining amount display device of the battery pack for a mobile phone according to the present invention.

<Description of Symbols for Main Parts of Drawings>

100, 200; Residual amount display device of a battery pack for a mobile phone according to the present invention

10; Battery pack 11; battery

12; Protective circuit board 13; case

14; Terminal 15; Protective circuit IC

16; Charge switch 17; Discharge switch

18; Secondary protection element 110; switch

120; A battery level indicator 121; Voltage detector

122; Voltage comparator 123; Switch element

124; Light emitting element

The present invention relates to a remaining amount display device of a battery pack for a mobile phone, and more particularly to a remaining amount display device of a battery pack for a mobile phone that can display the remaining amount of the battery in the battery pack itself.

Various portable electronic devices such as mobile phones, PDAs, and notebook computers are powered using at least one battery pack. Also, such portable electronic devices generally display the remaining capacity of the battery pack through a display unit such as a liquid crystal display. Of course, in order to display the remaining capacity of the battery pack, the portable electronic device has a remaining capacity detecting circuit for detecting the remaining capacity of the battery pack, an image display circuit (or software) for displaying a predetermined image according to the remaining capacity of the battery pack, and the like. Is installed.

However, such a conventional battery pack is in a state where the remaining capacity cannot be confirmed by the user from the moment it is separated from the portable electronic device. That is, the battery pack itself does not have a function of displaying the remaining capacity of the battery. Of course, when the battery pack separated from the portable electronic device is coupled to the charger, it may be known whether the battery is in a fully charged state or a discharged state. However, the charger simply displays only the fully charged state and the discharged state, thereby remaining in the battery pack. I don't know more precisely.

In addition, in recent years, a separate remaining capacity display device has been developed for displaying the remaining capacity of the battery pack separated from the portable electronic device in more detail, but this can also be achieved by only combining the battery pack with the remaining capacity display device. As can be confirmed, there is a problem inconvenient to use.

SUMMARY OF THE INVENTION The present invention has been made to overcome the above-described problems, and an object of the present invention is to provide a remaining amount display device of a battery pack for a mobile phone that can check the remaining amount of the battery through the battery pack itself.

In order to achieve the above object, the remaining charge display device of a battery pack for a mobile phone according to the present invention includes a battery capable of charging and discharging, a switch connected to the battery, and when the switch is on, sensing the voltage of the battery, The battery remaining amount display unit for outputting light of a predetermined color according to the voltage of the battery, and the battery, the switch and the remaining amount display unit is installed together.

As described above, the remaining amount display device of the battery pack for a mobile phone according to the present invention, even if the battery pack is separated from the portable electronic device, the remaining amount of the current battery pack through the battery remaining display unit installed in the battery pack itself by a switch operation by the user You can check exactly.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings such that those skilled in the art may easily implement the present invention.

FIG. 1A is a plan view illustrating an example of a remaining capacity display device of a battery pack for a mobile phone according to the present invention, and FIG. 1B is a cross-sectional view taken along the line 1b-1b of FIG. 1A.

As shown in FIG. 1A, the remaining amount display devices 200 and 200 of the battery pack 20 according to the present invention are installed at one side of a case 23 of the battery pack 20. In the drawing, reference numeral 14 is a terminal exposed to the outside of the case 23 for charging or discharging the battery pack 20.

Subsequently, as shown in FIG. 1B, a battery 21 capable of charging and discharging is installed inside the case 23, and a protective circuit board 22 is provided on one side of the battery 21. In addition, one side of the protective circuit board 22 or the battery 21 is provided with light emitting elements 224 and 224 for displaying the remaining amount of the battery 21 and switches 210 and 220 for operating the light emitting elements 224 and 224. .

Here, the battery 21 may be any rechargeable battery 21 (secondary battery). For example, a lithium ion battery, a lithium polymer battery, a nickel cadmium battery, a nickel hydrogen battery, a nickel manganese battery, and the like can be used, but the type is not limited in the present invention. In addition, the light emitting elements 224 and 224 and the switches 210 and 210 are exposed to the outside of the case 23 so that the user can visually check or directly manipulate the light from the outside. In addition, the switches 210 and 210 may be a variety of types such as a push switch, a dip switch or a slide switch, but the user may minimize the current consumption by the battery 21. It would be desirable for a push switch to be on only while is pressed.

In addition, although FIG. 1B illustrates that the light emitting devices 224 and 224 and the switches 210 and 210 are installed on the surface of the protection circuit board 22 or the battery 21, the light emitting devices 224 and 224 and the switches 210 and 210 in the present invention. ) Is not limited to the installation position, and may be installed on any portion of the case 23 surrounding the surface of the battery pack 20.

2 is a circuit diagram illustrating a remaining capacity display device of a battery pack for a mobile phone according to an embodiment of the present invention.

As shown in FIG. 2, the remaining amount display device 200 of the battery pack for a mobile phone according to the present invention includes a battery 21 capable of charging and discharging, a switch 210 connected to the battery 21, and the switch 210. When the (on) is turned on, the battery 21 includes a battery level indicator 220 that detects a voltage of the battery 21 and outputs light of a predetermined color according to the voltage of the battery 21.

Here, the battery remaining amount display unit 220 further includes a voltage detector 221, a voltage comparator 222, a switch element 223, and a light emitting element 224.

The voltage sensing unit 221 may be two distribution resistors connected to the switch 210. Accordingly, when the switch 210 is turned on, the voltage detector 221 distributes the voltage of the battery 21 appropriately and outputs the voltage to the voltage comparator 222.

In the voltage comparator 222, a predetermined voltage by the voltage sensing unit 221 may be input to the non-inverting terminal (+), and a predetermined reference voltage may be input to the inverting terminal (−). Therefore, the voltage comparator 222 outputs a high level electric signal when the voltage by the voltage detector 221 is greater than the reference voltage. Of course, the predetermined voltage by the voltage sensing unit 221 is input to the inverting terminal (-) and the predetermined reference voltage is input to the inverting terminal (-), so that the predetermined voltage by the voltage sensing unit 221 is referenced. The voltage comparator 222 may output a low level electric signal when the voltage is higher than the voltage.

One end of the switch element 223 is connected to the switch 210, and the other end thereof is connected to the light emitting element 224. Moreover, the switch element 223 is configured to be controlled in an on / off state by the voltage comparator 222. For example, the switch element 223 may be a bipolar transistor, a field effect transistor, or an equivalent element thereof, and the type of the switch element 223 is not limited thereto. Of course, in the case of a bipolar transistor, a predetermined current flows to the base by the voltage comparator 222, and in the case of a field effect transistor, a predetermined voltage is applied to the gate by the voltage comparator 222.

The light emitting element 224 is connected between the switch element 223 and a ground power source. The light emitting device 224 may be any one selected from a conventional light emitting diode (LED), an organic EL, a lamp, or an equivalent thereof, and is not limited thereto.

In the figure, reference numeral 15 is a protection circuit IC formed on the protection circuit board 22, 16 is a charge switch, and 17 is a discharge switch. In addition, (+) connected to the battery 21 is a + terminal, and (-) is a-terminal. In addition, reference numeral 18 is a secondary protection device connected between the battery 21 and the protection circuit board 22, for example, to increase the resistance value when the temperature increases to block the charging current or the discharge current.

3 is another circuit diagram illustrating a remaining capacity display device of a battery pack for a mobile phone according to another exemplary embodiment of the present invention.

Here, the overlapping of the remaining amount display device 100 of the battery pack for mobile phones of the remaining amount display device 200 of the battery pack for the mobile phone will be minimized.

As shown in the drawing, the first battery remaining amount display unit 220a, the second battery remaining amount display unit 220b, and the third battery remaining amount display unit 220c may be installed in the switch 210. That is, the present invention means that the remaining amount of the battery 11 can be displayed in three stages. Here, it is to be understood that the three battery level indicators 220a, 220b, and 220c are merely examples and may be installed in a greater or smaller number.

First, the first battery level indicator 220a outputs light of a first color when the voltage of the battery 11 is greater than or equal to a predetermined first voltage, and the second battery level indicator 220b is the battery 11. When the voltage is greater than or equal to the second predetermined voltage, the second color light is output. When the voltage of the battery 11 is greater than or equal to the predetermined third voltage, the third color light is output. It plays a role.

The first battery remaining amount display unit 220a is connected to the switch 210, so that when the switch 210 is turned on, a first voltage detector 221a for detecting a voltage of the battery 11 and the first The first voltage comparator 222a outputs a predetermined electrical signal when the voltage detected by the voltage sensing unit 221a is greater than the first reference voltage, and the battery when the predetermined signal is input from the first voltage comparator 222a. And a light emitting device 224 that emits light of a predetermined color by an on signal of the first switch device 223a. Here, the first reference voltage input to one input terminal of the first voltage comparator 222a may be set to, for example, 4.0V. Of course, the first reference voltage may be set to a different value.

The second battery remaining amount display unit 220b is connected to the switch 210 so that when the switch 210 is turned on, a second voltage detector 221b for detecting a voltage of the battery 11 and the second The second voltage comparator 222b outputs a predetermined electrical signal when the voltage detected by the voltage sensing unit 221b is greater than the second reference voltage, and when the predetermined signal is input from the second voltage comparator 222b. And a light emitting device 224 that emits light of a predetermined color by the on signal of the second switch device 223b. Here, the second reference voltage input to one input terminal of the second voltage comparator 222b may be set to 3.5V, for example. Of course, this second reference voltage may also be set to other values.

The third battery remaining amount display unit 220c is connected to the switch 210, so that when the switch 210 is turned on, the third battery detection unit 221c senses a voltage of the battery 11, and The voltage comparator 222c outputs a predetermined electrical signal when the voltage by the three voltage detector 221c is greater than the third reference voltage, and when the predetermined signal is input from the voltage comparator 222c. The switch element 223c is turned on to apply power, and the light emitting element 224 emits light of a predetermined color by an ON signal of the switch element 223c. Here, the third reference voltage input to one input terminal of the third voltage comparator 222c may be set to, for example, 3.0V. Of course, such a third reference voltage may also be set to a different value.

On the other hand, the light emitting device 224 is a common component of the first battery remaining amount display portion 220a, the second battery remaining amount display portion 220b, and the third battery remaining amount display portion 220c. Preferably, three primary color light emitting diodes are preferable. Of course, when the number of remaining battery indicators is larger, a light emitting device for outputting light of more kinds of different colors may be used.

4 is a schematic diagram illustrating a signal input state when a three primary color light emitting diode is used as a light emitting element in the remaining capacity display device of a battery pack for a mobile phone according to the present invention. Here, the three primary light emitting diodes as the light emitting element 224 may be, for example, light emitting diodes having R (red), G (green), and B (blue) terminals.

For example, when the voltage of the current battery 11 is 4.0 V or more, the first voltage comparator 222a, the second voltage comparator 222b, and the third voltage comparator 222c all output high-level signals, The first switch element 223a, the second switch element 223b, and the third switch element 223c are all turned on. Therefore, the power of the battery 11 is applied to all of the R, G, and B terminals of the light emitting element 224. As a result, the light emitting device 224 outputs light of a predetermined color in which red, green, and blue light are combined.

In addition, when the voltage of the current battery 11 is 3.5V to 4.0V or more, the second voltage comparator 222b and the third voltage comparator 222c output a high level signal, whereby the second switch element 223b and the first voltage are output. The three switch element 223c is turned on. Therefore, the power of the battery 11 is applied to the G and R terminals of the light emitting element 224. As a result, the light emitting device 224 outputs light of a predetermined color in which green and red light are combined.

In addition, when the voltage of the battery 11 is more than 3.0V to 3.5V, the third voltage comparator 222c outputs a high level signal, thereby turning on the third switch element 223c. Therefore, the power of the battery 11 is applied to the R terminal of the light emitting element 224. As a result, the light emitting device 224 outputs red light.

Of course, the connection state between the terminal of the light emitting element 224 and the switch elements 223a, 223b, and 223c may be arbitrarily changed, and thus, the color of light displayed may be changed according to the remaining capacity of the battery 11. have.

FIG. 5 is a flowchart illustrating an operation procedure of the remaining amount display device of the battery pack for a mobile phone according to the present invention. Here, the operation of the remaining amount display device 200 of the battery pack for a mobile phone shown in FIG. 3 will be described as an example. Therefore, reference is made to FIG. 3 together.

As illustrated, the remaining amount display device 200 of the battery pack for a mobile phone according to the present invention starts operation when the user presses the switch 210 connected to the battery 11.

When the switch 210 is turned on as described above, the first voltage detector 221a of the first battery remaining amount display part 220a and the second voltage detector 221b and the third battery of the second battery remaining amount display part 220b are first used. The third voltage detection unit 221c of the remaining amount display unit 220c operates to detect the current voltage of the battery 11. That is, the current remaining amount of the battery 11 is detected.

Subsequently, it is determined whether the detected voltage of the battery 11 is equal to or greater than a first reference voltage (for example, 4.0V) of the first battery remaining amount display unit 220a. This determination is, of course, performed by the first voltage comparator 222a.

When the detected voltage of the battery 11 is greater than or equal to the first reference voltage of the first battery remaining amount display part 220a, the first voltage comparator 222a outputs a high signal to the first switch element 223a. By turning on, the light of the first state is output by the light emitting element 224. For example, blue light is output through the light emitting element 224.

Subsequently, it is determined whether the detected voltage of the battery 11 is greater than or equal to a second reference voltage (for example, 3.5V) of the second battery remaining amount display unit 220b. This determination is, of course, performed by the second voltage comparator 222b.

When the detected voltage of the battery 11 is greater than or equal to the second reference voltage of the second battery remaining amount display part 220b, the second voltage comparator 222b outputs a high signal to the second switch element 223b. By turning on, the light of the second state is output by the light emitting element 224. For example, green light is output through the light emitting element 224.

Subsequently, it is determined whether the detected voltage of the battery 11 is equal to or greater than a third reference voltage (for example, 3.0 V) of the third battery remaining amount display unit 220c. This determination is, of course, performed by the third voltage comparator 222c.

When the detected voltage of the battery 11 is greater than or equal to the third reference voltage of the third battery remaining amount display part 220c, the third voltage comparator 222c outputs a high signal to the third switch element 223c. By turning on, the light of the third state is output by the light emitting element 224. For example, red light is output through the light emitting element 224.

Here, light of the first state, the second state, and the third state may be simultaneously output through the light emitting element 224.

That is, when the voltage of the battery 11 is 4.0 V or more, for example, the first voltage comparator 222a, the second voltage comparator 222b, and the third voltage comparator 222c all output high-level signals. The first switch element 223a, the second switch element 223b, and the third switch element 223c are all turned on, so that light in the first state, the second state, and the third state is simultaneously output. Therefore, for example, red, green, and blue light are output through the light emitting device 224.

In addition, when the voltage of the battery 11 is, for example, 3.5V to 4.0V, the first voltage comparator 222a outputs a low level signal, but the second voltage comparator 222b and the third voltage comparator ( 222c outputs a high level signal, whereby the second switch element 223b and the third switch element 223c are turned on, and eventually light in the second state and the third state is output together. Thus, for example, red and green light are output through the light emitting device 224.

 Further, when the voltage of the battery 11 is 3.0V to 3.5V, for example, the first voltage comparator 222a and the second voltage comparator 222b output a low level signal, but the third voltage comparator 222c. ) Outputs a high level signal, whereby the third switch element 223c is turned on, so that only light in the third state is output at this time. Therefore, for example, only red light is output through the light emitting element 224.

Finally, when the switch 210 is turned off by the user, such an operation is stopped. When the switch 210 is not turned off by the user, the above operation is repeatedly performed. That is, while the user turns on the switch 210, the remaining amount of the battery pack 10 is continuously displayed by the light emitting element 224.

As described above, the remaining amount display device of the battery pack for a mobile phone according to the present invention, even if the battery pack is separated from the portable electronic device through the battery remaining amount display unit installed in the battery pack itself by a switch operation by the user for the current battery pack It is effective to check the remaining amount accurately. That is, the present invention can easily check the remaining amount of the battery pack by itself without coupling the battery pack separated from the portable electronic device to the charger or using a separate remaining amount display device.

What has been described above is only one embodiment for implementing the remaining amount display device of the battery pack for a mobile phone according to the present invention, the present invention is not limited to the above embodiment, as claimed in the claims below Without departing from the gist of the present invention, anyone of ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims (6)

A battery capable of charging and discharging, a switch connected to the battery, a battery level indicator for detecting a voltage of the battery and outputting light of a predetermined color according to the voltage of the battery when the switch is turned on, and the battery And a case in which the switch and the remaining amount indicator are installed together, The battery level indicator is connected to the switch to at least one voltage sensing unit sensing a battery voltage when the switch is turned on, and outputs a predetermined electrical signal when the voltage by the voltage sensing unit is greater than a reference voltage. One voltage comparator, at least one switch element that is turned on to apply power to the battery when a predetermined signal is input from the voltage comparator, and one light emitting that emits light of a predetermined color by an ON signal of the switch element Device, wherein the one light emitting element is a multi-color light emitting diode. The method of claim 1, wherein the battery remaining amount display unit A first battery remaining amount display unit configured to output light of a first color when the battery voltage is greater than or equal to a predetermined first voltage; A second battery remaining amount display unit configured to output light of a second color when the battery voltage is greater than or equal to a predetermined second voltage; And a third battery remaining amount display unit configured to output light of a third color when the battery voltage is greater than or equal to a predetermined third voltage. delete delete The apparatus of claim 1, wherein the switch is exposed to the outside through the battery case so that the user can turn on or off the user. The apparatus of claim 1, wherein the light emitting device is exposed to the outside through the battery case so that a user can check the light emitting device.

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