KR20000047200A - Circuit of displaying battery charging status - Google Patents

Abstract

PURPOSE: A circuit of displaying battery charging status is provided to identify with ease a battery charging status of a mobile device by repetitive switching function of flashing status of a display element. CONSTITUTION: A circuit of displaying battery charging status includes a controller(10) which produces low battery alarm(LBA) to show the battery is low, and battery charge signal(BTP) to show the battery is charged by reversing the signal levels and outputting according to a specific interval. The primary and secondary switching elements(Q1,Q2) switches movements after authorization of BTP. The tertiary switching element(Q3) conducts repetitive switching after authorization of battery full signal(BAF) which shows reversed signal levels. An inverter(IN) reverses and outputs signals after authorization of LBA from the controller(10). A display lamp(20) flashes a red LED(LED1) and a green LED(LED2) simultaneously according to the switching of the primary and secondary elements(Q1,Q2), flashes the red LED(LED1) solely according to the output signal of the inverter(IN), and switches the simultaneous flashing status of the red LED(LED1) and the green LED(LED2), and the sole flashing status of the green LED(LED2) according to a specific interval by the repetitive switching of the tertiary switching element(Q3).

Description

Battery charge status display circuit

The present invention relates to a charge state display circuit of a battery, and more particularly, when charging a battery that is applied as a main power source to various portable miniaturized devices, it is possible to actively display the charge state more visibly. The present invention relates to a state of charge display circuit of a battery.

As is well known, as the miniaturization and high integration of circuit devices and integrated devices is possible due to the rapid development of semiconductor manufacturing technology, a portable computer called a portable computer equipped with a high capacity hard disk drive and a microprocessor capable of high speed processing is available. Portable handheld devices such as a computer, a portable audio player that has been miniaturized for easy portability, or a mobile communication terminal that allows users to perform voice communication while moving their positions even without a general phone installed have been developed. It is widely used.

In the case of a portable miniaturization device such as a notebook computer, a portable audio player, or a mobile communication terminal, a battery is built in as a main power source for the user to easily operate while moving, and the miniaturization device can be used for a long time. In addition, in order to reduce the burden of space devoted to the battery, the technical research to actively increase the power capacity of the battery to achieve the miniaturization of the size is being actively promoted.

On the other hand, in the above-described battery is built in the miniaturized device to be repeatedly charged and discharged, it is possible to detect the progress of the charging process or the state of completion of charging while the battery is being charged to the user In order to make the display visible, a charging display device employing a dual light emitting diode (LED) lamp is employed.

Here, when the charging display device to which the dual LED lamp is applied is configured in which a red LED and a green LED are combined in a double state, when the charging of the battery is detected, Both the red LED and the green LED are turned on, but when the charging state is detected, only the green LED is turned on so that the battery can be easily recognized.

However, in the charge display device to which the conventional dual LED lamp is applied to visually display the state of charge of the battery embedded in the various miniaturized devices, the red LED is detected when the state of charging of the battery is detected. Since both the and green LEDs are turned on to maintain the lighting state with no change, there is a problem in that the user cannot easily grasp the charging state unless the user approaches the nearby and carefully observes.

Accordingly, the present invention has been made in view of the above circumstances, and it is possible to easily charge the battery built in various portable miniaturized devices through the function of repeatedly switching the lighting state on the display device. The purpose is to provide a status display circuit.

According to the charge state display circuit of the battery according to the present invention to achieve the above object, in the battery charging device of a portable miniaturizing device which is operated by a power supplied by a battery built therein, detecting the state of charge of the battery A control unit for generating a low battery signal indicating a low battery capacity of the corresponding battery and repeatedly outputting a battery only charge signal indicating whether the battery is fully charged at predetermined time intervals, and installing the battery. First and second switching elements for switching operation by receiving a battery mounting signal indicating whether or not, and a third switching element for repetitive switching by receiving a battery only charging signal whose signal level is inverted according to a predetermined time interval from the controller. Receiving a low battery signal from the control unit and inverts the signal The inverting element and the red LED turning on the red light and the green LED turning on the green light are combined, so that the red LED and the green LED are turned on at the same time according to the switching state of the first and second switching elements. In addition, only the red LED is turned on according to the output signal from the inverter, and the simultaneous lighting state of the red LED and the green LED and only the green LED are turned on alone by repeated switching of the third switching element. The present invention provides a charge state display circuit of a battery including a display lamp that repeatedly switches states according to a predetermined time interval.

According to the present invention made as described above, when charging a battery that is applied as a power supply source to a variety of miniaturized devices, a full charge signal indicating whether or not the battery is fully charged at a predetermined time interval repeatedly As a result, the independent lighting state of the amber color light combined with the red LED and the green LED and the green LED can be repeatedly changed.

1 is a view showing a configuration of a state of charge display circuit of a battery according to a preferred embodiment of the present invention,

2 is a flowchart illustrating the operation according to the preferred embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: control unit, 20: display lamp,

Q1 to Q3: field effect transistors, D1, D2: diodes,

R1 to R3 are resistors and IN is inverter.

Hereinafter, an embodiment of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

That is, Figure 1 is a view showing the configuration of the battery state display circuit according to a preferred embodiment of the present invention, the control unit 10 in the device of the present invention according to the figure is a corresponding device (that is, notebook computer or portable Audio player or mobile communication terminal, etc.), and detects the power capacity of the battery built in the device, and when the battery is fully charged, the battery full charge terminal (BAF) Or when the power capacity of the battery falls below 10%, for example, the low battery signal LBA is generated at the low battery terminal.

In the figure, a battery mounting signal BTP is generated from a conventional battery sensing element (not shown) that detects whether the battery is mounted in the device, and the battery mounting signal BTP is a battery. If it is detected that it is mounted, it generates a "low" level signal, while if it is detected that it is not mounted, it generates a "high" level signal.

Here, the output terminal from which the battery mounting signal BTP is generated is connected to the gate terminals of the first field effect transistor Q1 and the second field effect transistor Q2, and the first field effect transistor Q1 and the second electric field. The effect transistor Q2 is connected to a power supply voltage terminal VDC to which a drain terminal is applied through a separate adapter terminal through a resistor R1 and a resistor R2, respectively.

In addition, a battery only charging terminal for outputting the full charge signal BAF of the controller 10 is connected to a gate terminal of the third field effect transistor Q3, and a drain terminal of the field effect transistor Q3 is connected to the resistor. A red LED (LED1) generating a red light and a green LED (LED2) generating a green light are connected between the terminal (R1) and the first field effect transistor (Q1) at the same time. It is connected to the red LED (LED1) side of the display lamp 20.

In addition, a low battery terminal for outputting the low battery signal LBA from the controller 10 is connected to an input terminal of the inverter IN, and the inverter IN is operated by a battery built in the corresponding device. In this supplied state, the output end thereof is connected to the red LED (LED1) side of the display lamp 20 via the second diode D2.

On the other hand, the second field effect transistor Q2 has its drain terminal connected to the power supply voltage terminal VDC and to the green LED (LED2) side of the display lamp 20.

Herein, the controller 10 may repeatedly toggle the signal level of the full charge signal output to the corresponding battery full charge terminal at a predetermined time interval, thereby preventing the third field effect transistor Q3. As the red LED (LED1) of the display lamp 20 can be repeatedly turned on / off while repeatedly performing on / off, the corresponding display lamp 20 is amber (green and red) synthesized with red. Color and green will be repeated repeatedly.

Next, the operation of the present invention made as described above will be described in detail with reference to the flowchart of FIG. 2.

First, in step 30, the controller 10 determines whether to turn off the power of the device. If it is determined that the power is turned off, the control unit 10 sets the on / off flag to "0" and then ( In step 31), the low battery level low battery signal is output to the low battery terminal as well as the low battery level charge signal is output through the low battery terminal (step 32).

On the other hand, if it is determined that the power is turned on in the determination result of step 30, the on / off flag is set to "1" (step 33), and then the entire system of the corresponding device is initialized (step 34). Instead of outputting the "low" level full charge signal through the battery full charge terminal, the low battery signal of the "high" level is output to the low battery terminal (step 32).

After performing steps 32 and 35, the process proceeds to step 36 where it is detected whether or not a battery mount signal BTP of "low" level is output as the battery is mounted in the apparatus.

If it is detected in step 36 that the battery mount signal BTP of the "low" level is not generated, the flow proceeds to step 37, where a signal of the "high" level is output, whereby the battery mount signal of the "high" level As the first and second field effect transistors Q1 and Q2 applied with BTP applied to their gate ends are turned on, the display lamp 20 does not receive a power supply voltage from the power supply voltage terminal VDC. State is maintained.

Then, after the predetermined time, for example, three seconds is delayed while the display lamp 20 is turned off in step 38, the process proceeds to the step 36 again.

However, when it is detected in step 36 that the battery mounting signal BTP having a "low" level is generated, the first and second field effect transistors Q1 and Q2 are turned off, respectively, and the power voltage terminal VDC is turned off. While the electricity is conducted to the ground terminal through the display lamp 20 from the red LED (LED1) and the green LED (LED2) constituting the display lamp 20 is turned on, the amber light is generated.

On the other hand, in step 39 it is detected whether the power supply voltage from the power supply voltage terminal VDC supplied through the separate adapter terminal is continuously supplied.

As a result of the detection, when the adapter terminal is disconnected and it is detected that the supply of the power voltage from the power supply voltage terminal VDC is released, the process proceeds to step 40 and the control unit 10 determines that the battery installed in the device is connected. When the capacity is detected, it is determined whether the battery capacity falls below the minimum capacity, for example, less than 10% (step 41).

If it is determined in step 41 that the capacity of the battery is falling below the minimum capacity, the control proceeds to step 42 to generate a low battery signal LBA having a "low" level through the low battery terminal. As the inverter IN generates the output signal of the "high" level by the low battery signal LBA of the "low" level, only the red LED LED1 of the display lamp 20 is turned on.

However, if it is detected that the power supply voltage from the power supply voltage terminal VDC is continuously supplied according to the detection result of step 39, the process proceeds to step 43 to detect whether the battery is fully charged.

As a result of the detection, when the battery capacity is at full charge, the full charge signal BAF is output at the "high" level so that only the green LED LED2 is turned on, and the process proceeds to step 38 for a predetermined time such as 3 seconds. After the delay, the process is resumed from step 36.

However, if the battery capacity is detected as not being fully charged as a result of the detection of step 43, the process proceeds to step 45 in which a "high" level full charge signal BAF is generated from the battery full charge terminal of the controller 10. Will be detected.

As a result of the detection, when the full charge signal BAF having the "low" level is detected, the process proceeds to step 47 and the full charge signal BAF is set to the "high" level so that only the green LED LED2 is turned on. Proceeding to 38, for example, a delay of a predetermined time such as 3 seconds is resumed from step 36.

However, if the full charge signal BAF having the "high" level is detected as a result of the detection, the process proceeds to step 46 where the red and green LEDs (LED1) of the display lamp 20 are set by setting the full charge signal BAF to the "low" level. After all LED2) is turned on, the process proceeds to step 38, for example, after a predetermined time of 3 seconds is delayed, the process proceeds to step 36 again.

That is, in the charging state, the control unit 10 repeatedly switches the signal level of the full charge signal BAF generated from the battery full charge terminal at predetermined time intervals, so that the second field effect transistor Q3 While repeatedly turning on / off, the display lamp 20 repeatedly switches the state of the lit color light from amber to green.

According to the present invention made as described above, it is possible to repeatedly vary the lighting color light of the display lamp for confirming the state of charge of the battery built-in for supplying power to various portable miniaturization device, the user pays special attention Even if it is not tilted, it is possible to easily check the normal state of charge of the battery.

Claims (1)

In the battery charging device of a portable miniaturization device which is operated by receiving power from a battery built therein, The battery detects the state of charge of the battery and generates a low battery signal (LBA) indicating a low capacity state of the corresponding battery, and repeatedly signals the battery only charge signal (BAF) indicating whether the battery is fully charged at a predetermined time interval. A controller 10 for inverting and outputting the level, First and second switching elements Q1 and Q2 for switching operation 7 receiving a battery mounting signal BTP indicating whether a battery is mounted; A third switching element Q3 for repeatedly performing switching by receiving the battery only charge signal BAF whose signal level is inverted at a predetermined time interval from the controller 10, An inverting element IN receiving the low battery signal LBA from the controller 10 and inverting and outputting the signal; The red LED (LED1) for illuminating the red light and the green LED (LED2) for illuminating the green light are combined, and the red LED (LED1) in accordance with the switching state of the first and second switching elements (Q1, Q2). ) And green LED (LED2) are turned on at the same time, and only the red LED (LED1) is turned on according to the output signal of the inverter (IN), and the third switching device (Q3) is repeatedly The red LED (LED1) and the green LED (LED2) simultaneously and the green LED (LED2) only by the switching, including the display lamp 20 for repeatedly switching the single lighting state according to a predetermined time interval A charge state display circuit of a battery.