KR100722527B1 - Portable Battery Pack Control Circuit - Google Patents

Abstract

The present invention relates to a control circuit of a portable battery pack. More particularly, the present invention relates to a control circuit of a multipurpose portable battery pack which displays a battery remaining amount and has an output adjustment function.

The present invention detects the current state of the battery by embedding the microcontroller in the battery pack together with the rechargeable battery to protect the battery against the input and output of the battery, and to maintain the power constant by adjusting the output according to the current battery state In addition, the remaining battery capacity and output status of the current battery is characterized in that the display.

According to the present invention, since a control circuit capable of charging a battery of a mobile phone, a PDA, an MP3, a DMB, or the like can be charged, the battery of various types of external devices can be charged. In particular, it is possible to prepare a plurality of battery packs to charge a portable external device for a long time while moving or not receiving power.

Battery pack, mobile phone charging, microcontroller, input / output condition detector, battery level

Description

Portable Battery Pack Control Circuit {Portable Battery Pack Control Circuit}

1 is an exploded perspective view of a portable battery pack of the present invention.

2 is an assembled perspective view of the integrated portable battery pack.

3 is a perspective view of the assembled portable battery pack.

4 is a control circuit block diagram of a conventional battery pack.

5 is a control circuit block diagram embedded in the battery pack of the present invention.

      <Description of the reference numerals for the main components>

   1: cover 2: case

   3: input / output jack 4: mainboard

   5: connecting cable 7: fixing screw

   10: control circuit 13: battery

   20: microcontroller (MCU) 21: power input unit

   22: display unit 23: control switch

   30: I / O blocking circuit for battery protection

   35 I / O voltage detector 36 I / O current detector

   40: controller 50: battery pack

   60: external device

The present invention relates to a control circuit of a portable battery pack. More specifically, the present invention relates to a control circuit of a multi-purpose portable battery pack having a battery level indicator and an output control function.

4 is a block diagram of a control circuit embedded in a conventional battery pack. In general, the portable battery pack includes a microcontroller 20, a battery 29, a battery protection circuit 28, an output control circuit 24, a display unit 22, and the like. The battery protection circuit 28 is a function of blocking the output by operating a protection circuit against the overvoltage (high voltage input during battery charging) and overdischarge (low voltage state of the battery) of the battery 29 to prevent the battery from being overcharged and overdischarged. Protect. The output control circuit 24 supplies the load with an output in which the voltage width is kept constant in designated steps. The display unit 22 detects the voltage of the current battery 29, displays the level of the voltage, and displays the current output stage.

In FIG. 4, the battery voltage detector 26 is connected to the battery protection circuit 28 and the constant voltage circuit 25 is connected in parallel. The power input unit 21 that checks the power of the charging unit of the external device 60 (electronics such as a PDA) is connected to the output switch 27 and the output control circuit 24 and connected to the microcontroller 20. The constant voltage circuit 25 supplies power to the microcontroller 20, and the output control circuit 24 controls the output switch 27. The display unit 22 displays the output power step by step.

However, the prior art has the following problems. If the battery protection circuit 28 charges and discharges higher than the current allowable by the battery during charging and discharging, the fuse inside the protection circuit is destroyed and the battery can no longer be used or excessive heat is generated in the battery. As a result, deformation of the battery appearance, leakage of the electrolyte, and a phenomenon of significantly reducing the initial charge capacity occur. In case of discharging, if the output is cut off by reacting more than necessary in case of connecting instantaneously high current load, if the output is cut off, even if the battery status and input / output are normal, shut off before inputting normal voltage from outside. There is a disadvantage that it is not convenient to use.

In addition, when several batteries are connected in series and parallel, the protection against discharge and charging of each battery is not made separately. Therefore, when there is a deviation in the remaining capacity of each battery, only the overall battery voltage is controlled. And there is a disadvantage in that the overcharge is shortened the life of the battery.

The output control circuit controls the output to maintain the pulse width of the on / off at each predetermined step when adjusting the power (power) of the output. At this time, if the voltage of the battery is continuously reduced due to the discharge of the battery during use, the overall output is changed because the width of the On / Off is kept constant, which causes the problem that the control of each step specified by the user is changed to the lower step. . Therefore, when the user wants to maintain a constant output, there is a disadvantage that the user must raise the output.

In addition, in the case of displaying the remaining battery capacity, a method of displaying the remaining battery capacity of a conventional battery of the prior art uses a method of detecting only the voltage of the current battery and displaying the remaining battery capacity according to the change of the voltage. When a battery connected in series has a deviation for each battery, the actual usable level is the average of the whole due to the deviation, so when the over-discharge battery is included, the actual usage time is different from that of the level display. Become possible In addition, since the voltage is greatly changed according to the current being used, the remaining level cannot be kept constant, and the remaining amount may increase when the used current is high and then decrease, causing confusion for the user. have.

According to the prior art of the present invention Korean Laid-Open Patent Publication No. 1999-65285 (published date: 1999. 8.5, Hallym Industrial Co., Ltd.) according to the "all-weather self-contained rechargeable battery pack", a battery pack is charged by mounting a small generator inside the battery. The technology to let go is disclosed. According to Korean Patent Publication No. 10-241906 (Announcement date: 2.1 / 2000, Samsung Electronics Co., Ltd.) "Battery Charging Circuit", battery charging is performed by varying the reference voltage corresponding to the battery full charge voltage variable characteristic according to the ambient temperature during battery charging. The circuit is open. In addition, according to Korean Patent Laid-Open Publication No. 2002-11240 (published on Aug. 2.8, 2002, LG Electronics Co., Ltd.) "Protection Circuit for Battery for Charging", the load amount is detected based on the discharge current of the battery, and based on the detection signal. A rechargeable battery protection circuit is disclosed in which a residual amount detection voltage supplied to a furnace residual amount detection unit is changed to always set an appropriate level discharge limit voltage regardless of a change in load amount.

However, the related art relates to a portable battery pack or a charging circuit that can be used only for a specific device (for example, a PDA), and has a problem in that one charger cannot be used for charging various kinds of electronic products.

The present invention has been made to solve the problems of the prior art as described above, an object of the present invention is to incorporate a microcontroller (MCU) with a rechargeable battery in a battery pack to sense the current state of the battery to the outside of the battery It protects the battery against input / output, maintains constant power by adjusting the output according to the current battery condition, displays the remaining battery capacity and output status of the battery externally, and displays the battery of the external device that uses the rechargeable battery. It is to provide a portable battery pack that can be charged.

Still another object of the present invention is to provide a portable battery pack having a compatible control circuit that can automatically charge various types of external devices according to a rating.

A portable battery pack of the present invention for achieving the above object is a battery, a battery protection circuit, an output control circuit, a charging display unit, a conventional charging battery charging circuit consisting of a microcontroller, the battery is a protection control circuit, It is connected to the microcontroller by the battery protection I / O blocking circuit and the battery protection control circuit, and the power input / output unit, the input / output voltage detection unit and the input / output current detection unit are connected to the microcontroller to automatically charge and check the power supply to the external device. The switch and the output switch is coupled in parallel, characterized in that connected to the input and output control circuit, the microcontroller.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

1 is an exploded perspective view of a portable battery pack of the present invention, Figure 2 is an assembled perspective view of the integrated portable battery pack, Figure 3 is a perspective view of the assembled portable battery pack.

5 is a control circuit block diagram embedded in the battery pack of the present invention.

As shown in FIG. 1, the portable battery pack of the present invention covers the upper surface of the case 2 with the main board 4 having the control circuit 10 in the case 2, the cover 1, and the case. (2) is firmly coupled to the set screw (7). The control switch 23, the display unit 22, and the input / output jack 3 are installed on the main board 4, and the connecting cable 5 connected to the charging unit of an external device (electronic product) is the main board 4. Is connected to. The control circuit 10 including the microcontroller 20 is embedded in the main board 4 as a chip, and a specific circuit of the control circuit 10 will be described later with reference to FIG. 5.

The control switch 23 receives the detection voltage of the power input unit 21 connected to the charging unit of the external device 60 (for example, a mobile phone, PDA, DMB, MP3, etc.) and determines the type of the external device to perform an operation. It is a switch for controlling the microcontroller such as to give a signal to the controlling microcontroller 20 to turn the output on or off, raise or lower the voltage current or raise or lower the temperature. In general, PDA is 8.4 V, cell phone 4.2 V, DMB 12 V, PMP 6 V. The display unit 22 displays the remaining battery capacity, and displays a set value with respect to the rated voltage of the external device. For example, enter various static pressure ratings such as "No. 1 = 4.2 V" and display it if necessary.

FIG. 2 is a view illustrating an integrated portable battery pack, in which a battery 13 is built in the battery case 2, and is called an integrated portable battery pack for convenience. The batteries 13 are connected in parallel, and the + and − terminals are connected to the battery protection input / output cut-off circuit 30 and the battery protection control circuit 33, and are connected in the main board 4 by the connecting wire 15. Is connected to the control circuit 10. On the outside of the case 2 is attached a product label (8) indicating the rating of the product.

3 is a view showing a state of use of the present invention. For convenience of description, as shown in FIG. 1, the battery pack in which the control circuit 10 is embedded is referred to as a "control device 40", and in the case where the battery 13 is embedded, it is referred to as a "battery pack 50". The battery pack 50 at the bottom is connected to the controller 40 and the connection cable 5 at the top, and the controller 40 is connected to the charging unit of the external device 60. Since the battery pack 50 is provided with several, the battery pack 50 can be used continuously during charging, thereby charging the external device 60 for a long time. With one battery pack, charging times are 8x for DMB and 16x for mobile phones.

5 is a block diagram of a control circuit embedded in the present invention. FIG. 5 is an electronic circuit block diagram of an improved control circuit 10 embedded in the main board 4 in FIGS. 1 and 2. As shown in FIG. 4, the conventional control circuit includes a battery, a battery protection circuit, an output control circuit, a display unit, and a microcontroller.

In the present invention, the battery 29 is connected to the microcontroller 20 by the battery protection control circuit 33, the battery protection input and output blocking circuit 30, the battery protection control circuit 33, for the external device 60 In order to check and automatically charge the power, the power input / output unit 21, the input / output voltage detection unit 35, and the input / output current detection unit 36 are connected to the microcontroller 20, and the charge switch 31 and the output switch 32 Are coupled in parallel and are connected to the input / output control circuit 34 and the microcontroller 20.

The display 22 and the control switch 23 are separately connected to the microcontroller 20. This is the same as in the prior art.

The battery protection control circuit 33 functions to block an over discharge and an over charge of a battery with respect to a current state of the battery to block an output and a charge input to a load. The input / output control circuit 34 adjusts the power to the external device at a predetermined step of the output and the user easily displays the operation step. The charging switch 31 for charging an external battery charges a rechargeable battery such as a mobile phone, a PDA, and a player, which are external devices 60. The display unit 22, which is a display device, displays the current output in levels or numbers, and detects the current voltage and current of the battery by displaying the remaining capacity available as the current output in levels or numbers. .

The operation description of the embodiment of the present invention is as follows.

The battery protection control circuit 33 functions as a blocking function for charging and discharging currents of the battery and a return function according to surrounding conditions, and controls a battery state detection circuit and an output state at the time of charging or discharging.

Detects overvoltage, overcurrent, output short, etc. by using the voltage and current detected by the input / output voltage detector 35 and the input / output current detector 36, and when the output is cut off, cancels the overvoltage of charging and disconnects the output load. When the state of the input / output side is normal due to the like, the situation is automatically recognized by the microcontroller 20 to terminate the blocking.

As a result, in the case of battery packs connected in series and in parallel with each other, the battery pack detects a voltage or current for each battery and inputs it to the microcontroller, and the microcontroller compares the detected voltage or current value to charge each battery. Function to control. The microcontroller compares the read values and operates the separate cutoff function for each battery when the deviation occurs, reducing the occurrence of the battery deviation and preventing overcharging and overdischarging of the battery. There is.

In addition, the input / output control circuit 34 changes the amount of current as the voltage of the battery decreases during use, and outputs a constant capacity output to the load as initially set by the user. As a result, the output load is continuously supplied with constant power regardless of the state of the battery without resetting.

The charging switch 31 automatically cuts off the output when there is no output of the external device 60 for a predetermined time as a switching means, and automatically cuts power consumption from the internal microcontroller 20 in the battery pack. That is, the standby time can be extended by preventing unnecessary discharge of the battery, and even when the input / output is blocked, the microcontroller 20 of the battery pack automatically recognizes the charge and charges the battery pack when connected to the charger. The mode is changed to smooth charging.

On the other hand, the charging switch 31 has a built-in charging unit for charging a constant current and constant voltage of the rechargeable battery of the mobile device capable of charging such as mobile phones, PDAs and MP3 players using the output of the battery pack. Using the output voltage and current detected by the output state detection unit, the microcontroller automatically detects whether it is a load or a battery and charges the battery.

The display unit 22 accurately displays the level of the amount of usage that can be used when the current state of the input / output current of the battery is used together with the current being used by using the variation of the voltage using the battery state detection circuit. have. In addition, when several batteries are used at the same time, voltage and current are separately detected for each battery, so that the deviation of each battery can be detected by using the value for each remaining battery to display an indication of the actual remaining battery capacity. It can display more precisely.

That is, the battery 29 is combined with the microcontroller 20 by the battery protection input and output blocking circuit 30, the battery protection control circuit 33, the battery protection circuit to minimize the battery deviation generated during charging and discharging Configure

 The charging switch 31, the input / output control circuit 34 and the microcontroller 20 are combined to change the output current according to the battery voltage change during use of the battery pack to maintain the overall capacity of the output constant Equipped.

The power input and output unit 21, the output switch 32 and the microcontroller 20 is coupled to characterized in that the charging smoothly by automatically recognizing the charge in the state that the input and output of the battery pack is blocked.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. Those skilled in the art can make modifications, changes, and the like without departing from the scope of the technical spirit of the present invention, and such modifications and changes are considered to belong to the present invention.

According to the present invention, the charging and discharging of the battery can be smoothly made according to the current state of conversion, thereby extending the life of the battery. In addition, the user can easily know the current state of charge and the setting state of the battery to properly adjust the charging time.

Particularly, when the output target is a constant load, the user increases the current of the output due to the voltage drop caused by the discharge of the battery during one-time setup, and the total output power does not become small, so the user does not need to change the setup continuously. Can provide convenience.

In addition, in the related art, only one designated device can be charged. However, the present invention has a built-in control circuit capable of charging a battery such as a mobile phone, PDA, MP3, or DMB. It can be charged. In particular, it is possible to charge a portable external device for a long time in a place where a plurality of battery packs are being moved or not supplied with power.

Claims (4)

In a conventional rechargeable battery charging circuit including a battery, a battery protection circuit, an output control circuit, a charging display unit and a microcontroller, the battery is connected by a battery protection input / output blocking circuit 30 and a battery protection control circuit 33. Connected to the microcontroller 20, the power input and output unit 21, the input and output voltage detector 35 and the input and output current detector 36 to check the power to the external device 60 and automatically charges the microcontroller 20 And a charge switch 31 and an output switch 32 are connected in parallel to the input / output control circuit 34 and the microcontroller 20. The battery protection circuit of claim 1, wherein the battery is coupled to the microcontroller 20 by a battery protection input / output blocking circuit 30 and a battery protection control circuit 33 to minimize battery variations generated during charging and discharging. Portable battery pack control circuit comprising a. The method of claim 1, wherein the charging switch 31, the input / output control circuit 34 and the microcontroller 20 are combined to change the output current according to the change of battery voltage during use of the battery pack to constant the overall capacity of the output. Portable battery pack control circuit, characterized in that it comprises an output system to maintain. The method of claim 1, wherein the power input and output unit 21, the output switch 32 and the microcontroller 20 is coupled to facilitate the charging by automatically recognizing the charge in the state that the input and output of the battery pack is blocked. Portable battery pack control circuit.

Images