KR20070082970A - Portable auxiliary power supply - Google Patents

Abstract

A portable auxiliary power supply is provided to obtain predetermined DC power by converting the DC power of a chargeable battery pack to a proper DC level when separating an external DC power and an external AC power from the portable auxiliary power supply. A portable auxiliary power supply includes a battery pack(11), a converter(12), a charge switch(13), and a discharge switch(14). The battery pack(11) is composed of at least one chargeable battery. The converter(12) receives power from an external DC power, an external AC power, and the battery pack(11), and converts the power to a predetermined level and outputs the predetermined DC power. A charge switch(13) inputs some of the output DC power of the converter(12) to the battery pack(11), and charges the battery pack(11). The discharge switch(13) outputs the DC power of the battery pack(11) to the converter(12) when the external DC power and the external AC power are interrupted.

Description

Portable auxiliary power supply

1 is a block diagram schematically showing a portable auxiliary power supply according to the present invention.

FIG. 2 is a block diagram illustrating an example of a charge switch and a discharge switch of the portable auxiliary power supply device shown in FIG. 1.

3 is a flow chart showing the main operation state of the portable auxiliary power supply according to the present invention.

<Description of Symbols for Main Parts of Drawings>

10; Portable auxiliary power supply device according to the present invention

11; Battery pack 12; Converter

13; Charge switch 14; Discharge switch

15; A charging circuit section 16; Transformer

17; Smoothing circuit section 18; Control

19; An output voltage controller 20; Display

21; Residual capacity detection and communication circuit

The present invention relates to a portable auxiliary power supply, and more particularly, to convert a battery pack by converting an external direct current power or an external alternating current power to a predetermined level, and also provides a variety of external direct current power supply, external alternating current power supply or power supply of a battery pack. The present invention relates to a portable auxiliary power supply which can be converted to a level and supplied to a portable electronic device.

BACKGROUND OF THE INVENTION Various portable electronic devices such as personal computer (PC) notebooks, personal digital assistants (PDAs), digital camcorders, digital cameras, mobile phones, and MP3 players are mostly supplied with a predetermined DC power supply from rechargeable battery packs. In addition, most of these manufacturers of portable electronic devices provide converters such as home AC-DC adapters or automotive DC-DC adapters to allow customers to charge or directly power battery packs. In the case of the AC-DC adapter, for example, the customer may simply be connected to an AC outlet provided in a home or an office to receive DC power. Similarly, in the case of a DC-DC adapter, the DC power may be supplied by being coupled to a cigar jack provided in an automobile.

On the other hand, these adapters are designed to output a rated DC voltage appropriately for each portable electronic device. Typically, the rated DC voltage is different from the power source used for each portable electronic device, but most are designed to output a DC voltage of about 5 ~ 12V.

However, although these power supplies can directly supply direct current power to the portable electronic devices and also charge the battery packs, customers have a number of power supplies to power each portable electronic device in various environments. You must carry it. Moreover, the AC-DC adapter and DC-DC adapter are not integrated and manufactured and supplied separately, so that the customer must prepare power supplies individually provided for each portable electronic device, as well as the AC-DC adapter and DC-DC adapter. There is a problem that each must be provided with a converter such as.

Therefore, there is a need for a single portable auxiliary power supply unit capable of supplying DC power directly to various portable electronic devices and also charging battery packs mounted in each device. Of course, such a portable auxiliary power supply should be able to be used in combination with both an AC power supply and a DC power supply, and also be able to charge a predetermined battery pack.

The present invention is to overcome the above-mentioned conventional problems, an object of the present invention is to convert the DC power source or AC power source to a predetermined level to charge the battery pack, and furthermore, the DC power source, AC power source or power source of the battery pack The present invention provides a portable auxiliary power supply that can convert to various levels and output a predetermined DC power.

In order to achieve the above object, the portable auxiliary power supply according to the present invention includes a battery pack including at least one chargeable and dischargeable battery, an external direct current power source, an external alternating current power source or power from the battery pack, and to a predetermined level. A converter for converting and outputting to a predetermined DC power, a charging switch for inputting some output DC power of the converter to the battery pack to charge the battery pack, and when the external DC power supply and the external AC power supply are cut off. And a discharge switch for outputting the DC power of the battery pack to the converter.

As described above, when the user connects the portable auxiliary power supply to an external DC power source or an external AC power source, the user can convert the external DC power source or the external AC power source to an appropriate DC level to obtain a predetermined DC power source. Of course, such a DC level can be adjusted by the user, so that the portable auxiliary power supply according to the present invention can be used as a power source for all kinds of portable electronic devices.

In addition, when the user connects the portable auxiliary power device to an external DC power source or an external AC power source, the user can charge the rechargeable battery pack by converting the external DC power source or the external AC power source to an appropriate DC level. .

Furthermore, when the user separates both the external DC power source and the external AC power source from the portable auxiliary power supply device, the DC power source of the rechargeable battery pack can be converted to an appropriate DC level to obtain a predetermined DC power source. Of course, even in this case, the user can adjust the DC level of the battery pack, so that the portable auxiliary power supply according to the present invention can be used as a power source for all kinds of portable electronic devices.

In addition, the present invention includes a member capable of detecting the remaining capacity of the battery pack, to transfer the remaining capacity of the battery pack to an external portable electronic device, as well as through the display unit provided on its own The remaining capacity can be visually confirmed.

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.

1, there is shown a schematic block diagram of a portable auxiliary power supply according to the present invention.

As illustrated, the portable auxiliary power supply 10 according to the present invention includes a battery pack 11, a converter 12, a charge switch 13, and a discharge switch 14. In addition, the present invention further includes a charging circuit section 15, a transformer 16, a smoothing circuit section 17, a control section 18, an output voltage adjusting section 19, a display section 20 and the remaining capacity detection and communication circuit section 21. It may include.

The battery pack 11 includes a conventional chargeable and dischargeable battery 11a. A plurality of chargeable and dischargeable batteries 11a may be connected in series and / or in parallel. In addition, the battery pack 11 may include a protection circuit part 11b. The protection circuit unit 11b detects an overcharge, an overdischarge, or an external short state of each battery 11a so that the battery pack 11 does not reach a dangerous state. In addition, the protection circuit unit 11b senses the voltage, current, and temperature of the battery pack 11 and transmits the same to the converter 12 to be described below. Of course, the protection circuit unit 11b may directly transmit voltage, current, and temperature information of the battery pack 11 to the controller 18 to be described below. In addition, the protection circuit unit 11b is connected to the battery pack 11 in parallel, and at the same time, it is possible to open or close any one of the charge and discharge wires during overcharging or overdischarging of the battery pack 11.

The converter 12 serves to convert a predetermined DC power source into a DC power source having a different level, and further controls the voltage, current, and temperature information of the battery pack 11 obtained from the protection circuit unit 11b. It also plays a role.

The converter 12 may be used as long as it can convert an input DC power of 12 to 24V into an output DC power of 1.5 to 12V. For example, the converter 12 may be a conventional buck converter, boost converter, forward converter, flyback converter, switch mode power supply (SMPS), or an equivalent thereof. The kind is not limited here.

One end of the charge switch 13 is connected to the node N1, which is the + pole output side of the converter 12, and the other end thereof is connected to the charging circuit unit 15 to be described below. Of course, the charging circuit unit 15 is connected to the node N2, which is a positive pole of the battery pack 11. In addition, the negative pole of the battery pack 11 is connected to the node N3 which is the negative pole output side of the converter 12. The charging switch 13 is turned on when the device 10 according to the present invention is connected to an external DC power source or an external AC power source (the discharge switch 14 is turned off), thereby outputting the converter 12. The battery pack 11 serves to charge by the DC power. Here, the charging circuit unit 15 serves to ensure a stable charging by making the charging current applied to the battery pack 11 is constant, as is well known. In the figure, reference numeral 22 denotes an output + terminal of the converter 12, and 23 denotes an output-terminal of the converter 12. In addition, the battery pack 11 may be coupled to and separated from the nodes N2 and N3. Of course, the protection circuit portion 11b may also be coupled to and separated from the converter 12.

One end of the discharge switch 14 is connected to a node N4, which is an input side of the converter 12, and the other end thereof is connected to a node N2, which is a + pole of the battery pack 11. The discharge switch 14 is turned on when the external DC power or the external AC power is cut off (the charging switch 13 is turned off at this time), so that the DC power of the battery pack 11 is supplied to the converter 12. Serves to ensure supply. In the figure, reference numeral 24 denotes an external DC input terminal, and 25 denotes an external AC input terminal.

As described above, an external DC power supply of about 12 to 24V and an external AC power supply of about 100 to 240V may be input to the present invention. The external AC power source may be connected to the transformer 16 to drop a voltage of approximately 12 to 24V AC power. In addition, the AC power supply in which the voltage is dropped in this manner is converted into almost DC power by the smoothing circuit section 17, and this DC power is again input to the converter 12.

In addition, an external direct current power source is connected to the node N5 between the transformer 16 and the smoothing circuit section 17. Accordingly, the external DC power supply is also input to the converter 12 through the smoothing circuit unit 17.

On the other hand, the smoothing circuit section 17 is capable of controlling the on / off states of the discharge switch 14 and the charge switch 13. That is, the smoothing circuit unit 17 controls the discharge switch 14 to be turned off when the external DC power or the external AC power is input, and controls the charging switch 13 to be turned on. In addition, the smoothing circuit unit 17 controls the discharge switch 14 to be turned on when the external DC power and the external AC power are cut off, and controls the charging switch 13 to be turned off. Here, one end of the charge switch 13 is connected to the node N6 between the smoothing circuit unit 17 and the discharge switch 14 for its control.

The control unit 18 is capable of directly controlling the converter 12. For example, the controller 18 outputs a predetermined control signal to the converter 12 to adjust the level of the DC power output by the converter 12. For example, when the converter 12 outputs a desired DC power at a pulse width or pulse frequency, the controller 18 may output a signal controlling the pulse width or pulse frequency to the converter 12. . In addition, the controller 18 receives voltage, current, and temperature information of the battery pack 11 obtained from the protection circuit unit 11b through the converter 12. Of course, the controller 18 calculates the remaining capacity of the battery pack 11 using the voltage, current, and temperature information of the battery pack 11. For example, the voltage, current, and temperature data of the battery pack 11 according to the remaining capacity are stored in a table in the controller 18, and the voltage, current of the current battery pack 11 is stored using the data. And by using the temperature information, the remaining capacity of the current battery pack 11 is calculated. In addition, the controller 18 also receives current voltage information output by the converter 12.

The output voltage adjusting unit 19 allows a user to directly input a desired output DC power. Of course, the value input in this way is transmitted to the control unit 18, and the control unit 18 then outputs a predetermined control signal to the converter 12 so that the converter 12 outputs the desired output DC power. Outputs

The display unit 20 visually displays the level of the output DC voltage by the converter 12 and the remaining capacity of the battery pack 11. That is, the display unit 20 receives a predetermined signal from the controller 18 and displays the level of the output DC voltage currently output by the converter 12 and the remaining capacity of the battery pack 11.

The remaining capacity detection and communication circuit 21 is connected to the control unit 18. The remaining capacity detection and communication circuit 21 outputs not only the remaining capacity of the battery pack 11 but also the voltage level information of the DC power output by the converter 12 through the communication port 26. In this way, the voltage level of the DC power output by the converter 12 and / or the remaining capacity of the battery pack 11 through an external portable electronic device (not shown) connected to the communication port 26. Can be easily understood by the user.

Referring to FIG. 2, an example of a charge switch and a discharge switch of the portable auxiliary power supply device shown in FIG. 1 is shown.

As shown, the above-described charging switch 13 may be, for example, an N-channel field effect transistor. Of course, the charge switch 13 may be an NPN bipolar transistor or an equivalent thereof, but is not limited thereto. In addition, the discharge switch 14 may be a P-channel field effect transistor. Of course, the discharge switch 14 may be a PNP bipolar transistor or an equivalent thereof, but is not limited thereto.

3, the main operating state of the portable auxiliary power supply 10 according to the present invention is shown as a flowchart. Here, the flow chart merely illustrates the operation sequence according to the present invention, and does not mean that all components are controlled by any one control unit.

Referring to Figures 1, 2 and 3 will be described the main operation of the present invention.

First, the portable auxiliary power supply 10 according to the present invention may be connected to an external power source or used independently without being connected. (S1)

In addition, the portable auxiliary power supply 10 may be used in a state in which it is connected to at least one of an external DC power supply 24 or an external AC power supply 25 among the external power supplies.

When the portable auxiliary power supply 10 according to the present invention is connected to the external DC power supply 24, the power from the DC power supply 24 is smoothed by the smoothing circuit unit 17 (S3), the portable auxiliary power supply device When the 10 is connected to the external AC power source 25, the power source from the AC power source 25 is dropped by the transformer 16 to a suitable AC voltage and then smoothed by the smoothing circuit unit 17. (S3)

Subsequently, the smoothing circuit section 17 outputs a high signal, for example, to the charge switch 13 and the discharge switch 14. In this way, the charge switch 13 is turned on, and the discharge switch 14 is turned off. (S5)

Therefore, the battery pack 11 is supplied with DC power from the node N1 at the output side of the converter 12 and charged. In addition, the converter 12 converts the predetermined DC voltage input from the smoothing circuit unit 17 to a predetermined level and outputs it to an external portable electronic device through terminals 22 and 23. Of course, the DC power of the battery pack 11 is not supplied to the input node N4 of the converter 12. (S6, S7)

On the other hand, when the portable auxiliary power supply 10 is disconnected from an external power source (ie, the DC power source 24 and the AC power source 25), the smoothing circuit unit 17 is the charge switch 13 and the discharge switch 14. Outputs a low signal. In this way, the charge switch 13 is turned off, and the discharge switch 14 is turned on. (S8)

Therefore, the battery pack 11 does not receive DC power from the node N1 on the output side of the converter 12, so that charging is stopped. Instead, the battery pack 11 supplies DC power to the node N4 on the input side of the converter 12. That is, the battery pack 11 is discharged. In this way, the converter 12 receives DC power from the battery pack 11, converts it to a predetermined level, and outputs the DC power to an external portable electronic device through terminals 22 and 23 (S9 and S7).

In addition, although not shown in the flowchart of FIG. 3, the control unit 18 may store the voltage, current, and temperature information of the battery pack 11 from the protection circuit unit 11b of the battery pack 11. Obtained via converter 12, the remaining capacity is calculated based on this.

The remaining capacity thus calculated is transmitted to the external portable electronic device through the remaining capacity detection and communication circuit 21 and the terminal 26. In addition, the control unit 18 displays the DC voltage output by the converter 12 through the display unit 20, and also displays the remaining capacity.

In addition, the user can input the potential of the desired output DC power supply to the control unit 18 by using the output voltage adjusting unit 19.

As described above, when the user connects the portable auxiliary power supply to an external DC power source or an external AC power source, the user can convert the external DC power source or the external AC power source to an appropriate DC level to obtain a predetermined DC power source. . Of course, such a DC level can be adjusted by the user, so that the portable auxiliary power supply according to the present invention can be used as a power source for all kinds of portable electronic devices.

In addition, when the user connects the portable auxiliary power device to an external DC power source or an external AC power source, the user can charge the rechargeable battery pack by converting the external DC power source or the external AC power source to an appropriate DC level. .

Furthermore, when the user separates both the external DC power source and the external AC power source from the portable auxiliary power supply device, the DC power source of the rechargeable battery pack can be converted to an appropriate DC level to obtain a predetermined DC power source. Of course, even in this case, the user can adjust the DC level of the battery pack, so that the portable auxiliary power supply according to the present invention can be used as a power source for all kinds of portable electronic devices.

In addition, the present invention includes a member capable of detecting the remaining capacity of the battery pack, to transfer the remaining capacity of the battery pack to an external portable electronic device, as well as through the display unit provided on its own The remaining capacity can be visually confirmed.

What has been described above is only one embodiment for implementing a portable auxiliary power supply according to the present invention, the present invention is not limited to the above-described embodiment, the subject matter of the present invention as claimed in the following claims Without departing from the technical spirit of the present invention to the extent that any person of ordinary skill in the art to which the present invention pertains various modifications can be made.

Claims (13)

A battery pack consisting of at least one rechargeable battery; A converter which receives power from an external DC power source, an external AC power source or the battery pack, converts the power to a predetermined level, and outputs the power to a predetermined DC power source; A charging switch configured to charge the battery pack by inputting some output DC power of the converter to the battery pack; And, And a discharge switch for outputting the DC power of the battery pack to the converter when the external DC power and the external AC power are cut off. The portable auxiliary power supply unit of claim 1, wherein a protection circuit unit is further connected to the battery pack to prevent overcharge and overdischarge of the rechargeable battery. The portable auxiliary power supply of claim 2, wherein the protection circuit unit detects a voltage, a current, and a temperature of the battery pack and outputs the detected voltage to the converter. The portable auxiliary power supply of claim 1, wherein a charging circuit unit is further connected between the charging switch and the battery pack such that the charging current supplied to the battery pack is constant. The transformer of claim 1, wherein a transformer for voltage drop is connected between the external AC power source and the converter, and a smoothing circuit unit for current smoothing is connected between the transformer and the converter, and the external DC power source is connected between the transformer and the smoothing circuit unit. Portable auxiliary power supply, characterized in that connected to. The method of claim 5, wherein the smoothing circuit portion is configured to output a predetermined control signal to the charge switch and the discharge switch, When any one of the external DC power source or the external AC power source is input to the smoothing circuit unit, the charging switch is turned on by the control signal of the smoothing circuit unit, and the discharge switch is turned off. And when the external DC power source and the external AC power source are not input to the smoothing circuit unit, the charging switch is turned off by the control signal of the smoothing circuit unit, and the discharge switch is turned on. 7. The portable auxiliary power supply of claim 6, wherein the charging switch is an N-channel field effect transistor or an NPN bipolar transistor. 7. The portable auxiliary power supply of claim 6, wherein the discharge switch is a P-channel field effect transistor or a PNP bipolar transistor. The portable auxiliary power supply according to any one of claims 1 to 7, wherein a control unit for outputting a predetermined control signal to the converter is further connected to the converter so that the level of the DC voltage output by the converter is adjusted. Device. 10. The portable auxiliary power supply of claim 9, wherein the control unit further comprises an output voltage adjusting unit for outputting a predetermined control signal to the control unit so that the user can arbitrarily adjust the level of the output DC voltage. The portable auxiliary power supply of claim 9, wherein the control unit is further connected with a display unit for displaying the level of the output DC voltage by the converter. 4. The converter according to claim 3, wherein the converter is further connected with a control unit for outputting a predetermined control signal to the converter such that the level of the DC voltage output by the converter is adjusted, and the control unit obtains from the protection circuit unit through the converter. Portable auxiliary power supply, characterized in that for calculating the remaining capacity of the battery pack using the voltage, current and temperature information of the battery pack. The method of claim 12, wherein the remaining capacity detection and communication circuitry is further connected to the control unit, the remaining capacity detection and communication circuitry is connected to the communication port, so that the control unit is a battery to the portable electronic device through the communication port Portable auxiliary power supply characterized by transmitting the remaining capacity information of the pack.

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