KR20090052739A - Portable charge/discharge apparatuses - Google Patents

Abstract

A portable charge / discharge device is disclosed. A portable charging / discharging device including an input port and an output port includes a battery unit, a display unit for displaying a charging operation or a discharging operation of the battery unit, and a charging voltage detected by detecting a charging voltage of the battery unit during the charging operation of the battery unit. The display unit is turned on when the first reference voltage is equal to or higher than the first reference voltage. The display unit is turned off when the detected voltage is higher than the second reference voltage. The discharge voltage of the battery unit is detected and detected when the battery unit is discharged. And a detection circuit for lighting the display unit when the discharge voltage is equal to or lower than the second reference voltage and turning off the display unit when the detected discharge voltage is lower than the first reference voltage.

Portable charging / discharging device

Description

Portable charge / discharge apparatuses

The present invention relates to a portable charging / discharging device, and in particular, it is possible to display the charging state and the discharging state when discharging the portable charging / discharging device, and to prevent damage caused by reverse current flowing from an external device. By connecting the portable charging / discharging device and the external device at the same time, it is possible to prevent the malfunction of the charging status display during charging, and to selectively charge the external device and the portable battery charging / discharging device, and also to output the portable charging / discharging device. The present invention relates to a portable charge / discharge device that can control the magnitude of voltage.

1 is a schematic block diagram of a general portable charging / discharging device. Referring to FIG. 1, the portable charging / discharging device 1 is connected to an external charger through an input unit (or an input port, for example, a TTA 24-pin; 10) to supply external power supplied through the external charger. When supplied, the battery unit 30 is charged, and the charged voltage is supplied to an external device (eg, a mobile phone, a PDA, etc.) connected to an output unit (or an output port such as a TTA 24-pin).

Recently, as the supply of portable electronic devices (eg, mobile phones, MP3s, notebooks, digital cameras, PMPs, etc.) increases, the use of the portable charging / discharging device 1 is gradually increasing.

In addition, as the size of the portable charging / discharging device 1 becomes smaller and smaller, the portable charging / discharging device 1 may be improved by being used as an accessory of an external device. As shown in FIG. In addition, the switch circuit (for example, the LED controller 41) and the light emitting diode (LED) 42 may be further implemented in (1).

In general, the portable charging / discharging device 1 is an apparatus for supplying a preliminary power supply voltage corresponding to a pre-charged main power supply voltage to the electronic device when the voltage of the main power supply to the electronic device is disconnected (or consumed). As a secondary battery (e.g., Li-ion battery), it is used as an auxiliary power supply of the electronic device.

That is, the portable charging / discharging device 1 is a device for supplying emergency power to the external device in a situation where the power of the internal battery of the external device is consumed and cannot be charged through the charger. However, the conventional portable charging / discharging device 1 has a problem in that it cannot indicate how much power is left.

Accordingly, the present invention has been made in an effort to provide a portable charging / discharging device capable of displaying a charging state and a discharging state when discharging a portable charging / discharging device.

In addition, the technical problem to be solved by the present invention can prevent damage caused by reverse current flowing from the external device, and can prevent the malfunction of the charge state display during charging by connecting the portable charging / discharging device and the external device at the same time. The present invention provides a portable charging / discharging device capable of selectively charging an external device and a portable battery charging / discharging device and controlling the magnitude of the output voltage of the portable charging / discharging device.

A portable charge / discharge device including an input port and an output port according to an embodiment of the present invention includes a battery unit; A display unit for displaying a charging operation or a discharging operation of the battery unit; And detecting a charging voltage of the battery unit during a charging operation of the battery unit, lighting the display unit when the detected charging voltage is equal to or higher than a first reference voltage, and when the detected voltage is higher than a second reference voltage, displaying the display unit. When the discharge operation of the battery unit is turned off, when the discharge voltage detected by the battery unit is detected to be equal to or lower than the second reference voltage, the display is turned on and the detected discharge voltage is lower than the first reference voltage. And a detection circuit for turning off the display.

The detection circuit outputs a control signal having a first level when the first voltage generated based on the charging voltage of the battery unit is equal to or higher than a first threshold voltage during the charging operation of the battery unit, and the first voltage is the first voltage. A first control circuit for outputting the control signal having a second level when less than one threshold voltage; A second control circuit outputting a voltage lower than the first threshold voltage as the first voltage when a second voltage generated based on the charging voltage is equal to or higher than a second threshold voltage during the charging operation of the battery; And a switching circuit for turning on the display in response to the control signal having the first level and turning off the display in response to the control signal having the second level.

The portable charging / discharging device supplies a voltage for supplying a voltage to the display unit when a charger is connected to the input port for charging operation of the battery unit or an external device is connected to the output port for discharging operation of the battery unit. It further includes a circuit.

A portable charge / discharge device including an input port and an output port according to an embodiment of the present invention includes a battery and a battery protection device connected in series between a first power line and a second power line; A detection block which detects reverse current flowing from an external device connected to the output port and outputs a first control signal; And a protection circuit outputting a second control signal to the battery protection device in response to the first control signal, wherein the battery protection device is enabled / disabled in response to the second control signal.

The detection block may include a voltage generation circuit for generating a first voltage and a second voltage based on the reverse current; And a comparison circuit for outputting a voltage generated using the first voltage as a first control signal based on an output signal generated based on a voltage difference between the first voltage and the second voltage.

The protection circuit may include a first switching circuit configured to output the second control signal based on the first control signal; A display unit connected between the first power supply line and an output terminal of the switching circuit and turned on or off in response to the second control signal; And a second switching circuit for controlling transmission of the second control signal to the battery protection device based on the second control signal.

A portable charge / discharge device including an input port and an output port according to an embodiment of the present invention includes a resistance circuit connected between the input port and the output port; A switch connected in parallel with the resistance circuit; A comparison circuit for outputting the first voltage as a first control signal based on an output signal generated based on a difference between the first voltage and the second voltage generated across the resistor circuit; A switching circuit switched in response to the first control signal; A display unit connected between the input port and the output terminal of the switching circuit; And a battery unit connected between the output port and the ground line.

A portable charge / discharge device including an input port and an output port according to an embodiment of the present invention includes a battery unit; The rechargeable battery unit may be configured to supply an input voltage supplied through the input port to an external device based on a first operating state, and receive a voltage supplied through the input port based on a second operating state. And a switching circuit for supplying to an external device connected to the output port.

A portable charge / discharge device including an input port and an output port according to an embodiment of the present invention includes a battery unit; A connection detector for generating a control signal based on whether the output port is connected to an external device; And a voltage conversion circuit converting the voltage discharged from the battery unit into a DC voltage in response to the control signal, and supplying the converted DC voltage to the external device.

The portable charging / discharging device may include: a display unit for displaying a charging operation or a discharging operation of the battery unit; And detecting a charging voltage of the battery unit and lighting the display unit when the detected charging voltage is equal to or higher than a first reference voltage, and when the detected voltage is higher than a second reference voltage. Turn off the light, and when the discharge voltage of the battery unit is detected and the detected discharge voltage is equal to or lower than the second reference voltage, the display is turned on and the detected discharge voltage is higher than the first reference voltage. The detection circuit further includes a detection circuit that turns off the display unit when it is low.

When the external device is connected to the output port, the portable charging / discharging device generates the control signal for enabling the voltage conversion circuit based on a voltage input from the external device.

The portable charging / discharging device according to the present invention has the effect of displaying the charging state and the discharging state when discharging the portable charging / discharging device of the portable battery charging / discharging device.

In addition, the portable charging / discharging device according to the present invention has the effect of preventing damage caused by reverse current flowing from an external device.

In addition, the portable charging / discharging device according to the present invention has the effect of preventing the malfunction of the charging state display when charging by connecting the portable charging / discharging device and the external device at the same time.

In addition, the portable charging / discharging device according to the present invention has the effect of selectively charging the external device and the portable battery charging / discharging device.

In addition, the portable charging / discharging device according to the present invention has the effect of controlling the magnitude of the output voltage of the portable charging / discharging device.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

2 is a block diagram of a portable charging / discharging device according to an exemplary embodiment of the present invention. Referring to FIG. 2, a portable electronic device, such as a mobile phone, a personal digital assistant (PDA), a PDA phone, a portable multimedia player (PMP), an MP3 player, and a portable communication device according to an embodiment of the present invention may be connected to a power source. The portable charging / discharging device 100 capable of supplying an input device includes an input port (eg, TTA 24-pin; 110), an output port (eg, TTA 24-pin; 120), a battery unit 130, a detection circuit 140, and an indicator. The unit 150 and the voltage supply circuit 160 is included.

The input port 110 is connected to an external charger (not shown) when the portable charging / discharging device 100 is charged to supply the power voltage supplied from the external charger to the inside of the portable charging / discharging device 100.

The output port 110 supplies a voltage discharged from the battery unit 130 to the connected external device when the portable charging / discharging device 100 discharges. The external device may be a mobile phone, a PDA, an MP3, a notebook, a digital camera, or a PMP.

The input port 110 and the output port 120 may be implemented by the Korea Information and Communication Technology Association (TTA) standard 24-pin connector, and include a USB connector, an optical connector, a card edge connector, a direct connector, a one-piece connector, It can also be implemented as a two-piece connector, a connector for a flat cable, a angular connector, a multipole relay connector, an annular connector, a coaxial connector, or an IC socket.

The battery unit 130 includes a battery 131 and a battery protection device 132. The battery 131 is charged with a voltage (or charge) supplied from an external charger connected to the input port 110 during the charging operation. In addition, the battery 130 outputs a voltage charged to an external device connected to the output port 120 during the discharge operation.

The battery 131 may be implemented as a nickel cadmium (Ni-Cd) battery, an alkaline battery, a nickel hydrogen battery, a sealed lead acid battery, a lithium ion (Li-ion) battery, or a lithium polymer battery.

The battery protection device 132 protects the battery 131 by performing an operation, for example, a switching operation when the battery 131 is overcharged or overdischarged.

The detection circuit 140 detects the charging voltage of the battery unit 130 during the charging operation of the battery unit 130, for example, when the external charger is connected to the input port 110, and the detected charging voltage is the first reference. If the voltage is equal to or higher than the voltage, the display unit 150 is turned on. If the detected charging voltage is higher than the second reference voltage, the display unit 150 is turned off. In addition, when the detected charging voltage is lower than the first reference voltage, the display unit 150 is turned off.

In addition, the detection circuit 140 detects the discharge voltage of the battery unit 130 during the discharge operation of the battery unit 130, for example, when the external device and the output port 120 are connected, and the detected discharge voltage is increased. The display unit 150 is turned on when it is equal to or lower than the second reference voltage, and the display unit 150 is turned off when the detected discharge voltage is lower than the first reference voltage.

Here, the display unit 150 is turned on when the charge voltage or the discharge voltage of the battery unit 130 is between the first reference voltage and the second reference voltage. Each of the first reference voltage and the second reference voltage may be appropriately set according to each embodiment.

The detection circuit 140 includes a first control circuit 141, a second control circuit 142, and a switching circuit 143.

In the first control circuit 141, when the battery unit 130 is charged, the first voltage V1 generated based on the charge voltage of the battery unit 130 is equal to or greater than the first threshold voltage Vth1. Outputs a control signal Vc having a first level (e.g., a high level) when it is high, and a second level (e.g., a low level) when the first voltage Vl is lower than the first threshold voltage (Vthl). The control signal Vc having

The first control circuit 141 includes a first resistor R1, a second resistor R2, and a first switching unit PZD1. The first resistor R1 is connected between the first power supply line L1 and the first node ND1, and the second resistor R2 is connected between the first node ND1 and the second node ND2. .

The first switching unit PZD1 is connected between the first power line L1 and the third node ND3 and based on the first voltage V1, supplies a voltage supplied through the first power line L1. Output to the switching circuit 143. The first voltage V1 represents the voltage of the first node ND1, and the first threshold voltage Vth1 represents the threshold voltage of the first switching unit PZD1.

The second control circuit 142 may generate the first threshold voltage when the second voltage V2 generated based on the charging voltage during the charging operation of the battery unit 130 is equal to or higher than the second threshold voltage Vth2. A voltage lower than Vth1 is output as the first voltage V1. That is, the voltage of the second node ND2 is output as the first voltage V1.

The second control circuit 142 includes a third resistor R3, a fourth resistor R4, and a second switching unit PZD2. The third resistor R3 is connected between the first power supply line L1 and the fourth node ND4, and the fourth resistor R4 is connected between the second node ND2 and the fourth node ND4. do.

The second switching unit PZD2 is connected between the first node ND1 and the second node ND2, and the voltage of the second node ND2 is based on the second voltage V2. Supply to the first node (ND1).

The second voltage V2 represents the voltage of the fourth node ND4, and the second threshold voltage Vth2 represents the threshold voltage of the second switching unit PZD2.

The first switching unit PZD1 and the second switching unit PZD2 may be implemented as Zener diodes. In this case, the threshold voltage Vth1 of the first switching unit PZD1 is lower than the threshold voltage Vth2 of the second switching unit PZD2.

The switching circuit 143 is connected between the output terminal of the display unit 150 and the second node ND2, and turns on the display unit 150 in response to the control signal Vc having the first level. In response to the control signal Vc having the second level, the display unit 150 is turned off. The switching circuit 143 may be implemented with a MOSFET or a bipolar junction transistor (BJT).

The detection circuit 140 prevents damage of the first switching unit PZD1 due to the rapid inflow of current from the outside, and provides a protection circuit 144 for stabilizing the operation of the first switching unit PZD1. It may further include.

The protection circuit 144 includes a fifth resistor R5, a capacitor C1, a sixth resistor R6, a diode D1, and a seventh resistor R7.

The fifth resistor R5 is connected between the first power line L1 and the fifth node ND5, and the first capacitor C1 is connected to the fifth node ND5 and the sixth node ND6. Connected between. The sixth resistor R6 is connected between the second node ND2 and the sixth node ND6.

The diode D1 is connected between the third node ND3 and the sixth node ND6, and the seventh resistor R7 is connected between the second node ND2 and the third node ND3. .

The power supply circuit 160 is connected to the input port 110 for the charging operation of the battery unit 130, or external to the output port 120 for the discharge operation of the battery unit 130 When the device is connected, a voltage is supplied to the display unit 150.

The power supply circuit 160 includes an eighth resistor R8, a ninth resistor R9, and a comparison circuit U1. The eighth resistor R8 is connected between the second node ND2 and the first input terminal of the comparator U1, for example, a positive input, and the ninth resistor R9 is connected to the eighth resistor R9. It is connected between two nodes ND2 and the output terminal of the comparator U1. A second input terminal of the comparator U1, for example a negative input terminal, is grounded.

The comparator U1 amplifies the difference between the voltage input to the first input terminal and the voltage input to the second input terminal and outputs the amplified voltage.

The display unit 150 is connected between an output terminal of the voltage supply circuit 160 and an input terminal of the switching circuit 143 to receive a voltage output from the power supply circuit 160, and receives the switching circuit ( The light is turned on or off based on the operation of 143).

The display unit 150 may be implemented as a light emitting diode (LED). The display unit 150 may further include a tenth resistor R10 connected between an output terminal of the voltage supply circuit 160 and an input terminal of the LED LED1.

3 is a view showing a portable charging / discharging device according to another embodiment of the present invention. Referring to FIG. 3, the portable charge / discharge device 200 includes an input port 110, an output port 120, a battery unit 130, a detection block 210, and a protection circuit block 220.

The input port 110 is connected to an external charger (not shown) during the charging operation of the portable charging / discharging device 200 to transfer the power supply voltage supplied from the external charger into the portable charging / discharging device 200. Supply.

The output port 110 converts the voltage discharged from the battery unit 130 when the portable charging / discharging device 200 is discharged to an external device (for example, a mobile phone, etc.) connected to the output port 110. Supply.

The input port 110 and the output port 120 may be implemented as a standard 24-pin connector for a mobile phone, a USB connector, an optical connector, a card edge connector, a direct connector, a one-piece connector, a two-piece connector, a connector for a flat cable, It can also be implemented as a square connector, a multi-pole relay connector, an annular connector, a coaxial connector, or an IC socket.

The battery unit 130 includes a battery 131 and a battery protection device 132 connected in series between a first power line L1 and a second power line, for example, a line for supplying a ground voltage. The battery 131 receives and stores a voltage (or charge) supplied from an external charger connected to the input port 110 during a charging operation. In addition, the battery 130 discharges the charging voltage to an external device connected to the output port 120 during the discharge operation.

The battery 130 may be implemented as a nickel cadmium (Ni-Cd) battery, an alkaline battery, a nickel hydrogen battery, a sealed lead acid battery, a lithium ion battery, or a lithium polymer battery.

The battery protection device 132 operates when the battery 131 is overcharged or over discharged to protect the battery 131.

The detection block 210 detects a reverse current Is flowing from an external device connected to the output port 110 and outputs a first control signal Vo.

The detection block 210 includes a voltage generation circuit 211 and a comparison circuit 212.

The voltage generation circuit 211 generates the first voltage V3 and the second voltage V4 based on the input reverse current Is.

That is, the voltage generation circuit 211 generates the first voltage V3 through the input terminal of the voltage generation circuit 211 by the reverse current Is flowing in the voltage generation circuit 211, and the voltage The second voltage V4 is generated through the output terminal of the generation circuit 211. The voltage generation circuit 211 may be implemented as a shunt resistor circuit SR1.

The comparison circuit 212 amplifies a voltage difference between the first voltage V3 and the second voltage V4 and first controls the first voltage V3 in response to the amplified output signal Vu. The signal Vo may be output.

The comparison circuit 212 includes a comparator U2 and a first switching unit Q2. The comparator U2 has a first voltage V3 input to a first input terminal, for example, a positive input terminal, and a second voltage V4 input to a second input terminal, for example, a negative input terminal. ), Amplify the received voltage difference, and output the amplified output signal Vu.

That is, when reverse current Is flows from the external device, since the first voltage V3 is higher than the second voltage V4, the comparator U2 outputs the first signal Vu having the first level. Outputs

In this case, the first switching unit Q2 outputs a voltage corresponding to the first voltage V3 as the first control signal Vo in response to the output signal Vu having the first level. The first switching unit Q2 may be implemented as a MOSFET (eg, a PMOSFET or an NMOSFET) or a BJT (npn TR or pnp TR).

The comparison circuit 212 may further include a first resistor R11 and a second resistor R12. The first resistor R11 is connected between an input terminal of the voltage generator circuit 211 and a first input terminal (+) of the second comparator U2. The second resistor R12 is connected between the output terminal of the voltage generator circuit 211 and the second input terminal (−) of the comparator U2.

At this time, the first voltage (V3) and the second voltage (V4) supplied to the input terminal pair ((+) and (-)) of the comparison circuit 212 are respectively the first resistor (R11), and It may be a voltage lowered by the second resistor R12.

The protection circuit block 220 outputs a second control signal Vd to the battery protection device 132 in response to the first control signal Vo.

The protection circuit block 220 includes a first switching circuit 221, a second switching circuit 222, and a display unit 223. The first switching circuit 221 outputs the second control signal Vd based on the first control signal Vo.

That is, the first switching circuit 221 outputs the ground voltage GND as the second control signal Vd to the node ND7 based on the first control signal Vo.

The first switching circuit 221 includes a plurality of resistors R13, R14, and R15, and a second switching unit Q3. The resistor R13 is connected between the node ND12 and the ground terminal GND. The resistor R14 is connected between the node ND12 and the node ND13. The resistor R15 is connected between the node ND13 and the ground terminal GND.

The second switching unit Q3 is turned on / off based on the first control signal Vo, that is, the voltage of the node ND13. When the voltage at the node ND13 is sufficient to turn on the second switching unit Q3, the node ND7 is pulled down to the ground voltage GND.

The second switching circuit 222 controls the transmission of the second control signal Vd to the battery protection device 132 based on the second control signal Vd.

That is, when the second switching circuit 222 is turned on based on the voltage of the node ND7, for example, the second control signal Vd having the ground voltage level, the second switching circuit 222 may turn the ground. The second control signal Vd having the voltage level is output to the battery protection device 132.

The display unit 223 implemented as an LED (LED2) is based on a voltage received through the first power line (L1), for example, the second voltage (V4) when the reverse current Is flows through the output port 120. To emit light. The display unit 223 may further include a resistor R16 connected between the first power line L1 and an input terminal of the LED LED2.

The battery protection device 132 is enabled / disabled in response to the second control signal Vd to protect the battery 131 when reverse current Is flows from the external device.

For example, the battery protection device 132 may be an internal circuit of the battery protection device 132 in response to a second control signal Vd having a low level, for example, a ground voltage level, output from the second switching circuit 222. Blocking the battery 131 from the battery protection device 132. Thus, the battery protection device 132 protects the battery 131.

4 is a view showing a portable charge / discharge device according to another embodiment of the present invention. Referring to FIG. 4, the portable charging / discharging device 300 includes an input port 110, an output port 120, a battery unit 130, a voltage generation block 310, a comparison circuit 320, and a switching circuit ( 330, and a display unit 340.

The input port 110 is connected to an external charger (not shown) when the portable charging / discharging device 300 charges to supply the power voltage supplied from the external charger to the portable charging / discharging device 300.

The output port 110 supplies a voltage discharged from the battery unit 130 to the connected external device (eg, a mobile phone, etc.) when the portable charging / discharging device 300 discharges.

Input port 110 and output port 120 may be implemented as a TTA 24-pin connector, USB connector, optical connector, card edge connector, direct connector, one-piece connector, two-piece connector, connector for flat cable, square connector, It can also be implemented as a multipole relay connector, annular connector, coaxial connector, or IC socket.

The battery unit 130 includes a battery 131 and a battery protection device 132 connected in series between the output port 120 and the ground line. The battery 131 charges a voltage supplied from an external charger connected to the input port 110 during a charging operation. In addition, the battery 130 discharges the charging voltage to an external device connected to the output port 120 during the discharge operation.

The voltage generation block 310 includes a plurality of resistors 311, and 312, and a switch 313. The resistor 311 is connected between the input port 110 and the output port 120. The resistor 312 is connected in parallel with the resistor 311 via a switch 313.

That is, when no external device is connected to the output port 120, the switch 313 is automatically turned off or off manually. Therefore, the first voltage V5 and the second voltage V6 are generated by the current I1 flowing through the resistor 311. At this time, the current I1 flowing through the resistor 311 is equal to the current Iin input to the input terminal of the voltage generation block 310.

However, when an external device is connected to the output port 120, the switch 313 is automatically turned on or manually. Accordingly, the current Iin input to the input terminal of the voltage generation block 310 is divided into the current I1 flowing through the resistor 311 and the current I2 flowing through the resistor 312. The current flowing through the resistor 311 may be constantly adjusted by turning on / off the switch 313.

The comparison circuit 320 sets the voltage V6 as the first control signal Vo based on the output signal Vu generated based on the difference between the voltages V5 and V6 generated at both terminals of the resistor 311. Output

The comparison circuit 320 includes a comparator U3 and a first switching unit Q4. The comparator U3 receives and compares the first voltage V5 and the second voltage V6, and outputs output signals Vu having different voltage levels based on the comparison result.

The first switching unit Q4 outputs the second voltage V6 as the first control signal Vo in response to the output signal Vu having the first level. The first switching unit Q4 may be implemented with a MOSFET or a BJT.

The comparison circuit 320 may further include a first resistor R21 and a second resistor R22. The comparator U3 compares the voltage input to the first input terminal (+) through the first resistor R21 and the voltage input to the second input terminal (-) through the second resistor R22, and The output signal Vu is output according to the comparison result.

The switching circuit 330 is switched in response to the first control signal Vo to supply the ground voltage to the display unit 340 through the node ND21.

The switching circuit 330 includes a plurality of resistors R23, R24, and R25 and a second switching unit Q5. The resistor R23 is connected between the node ND22 and the ground terminal. The resistor R24 is connected between the node ND22 and the node ND23. The resistor R25 is connected between the node ND23 and the ground terminal GND.

The second switching unit Q5 controls to output the ground voltage GND to the node ND21 based on the voltage of the node ND23 generated based on the first control signal Vo. The second switching unit Q5 may be implemented with a MOSFET or a BJT.

The display unit 340 is connected between the input port 110 and the output terminal ND21 of the switching circuit 330, is turned on while the battery unit 130 is charged or discharged, and the battery unit 130 is charged. 2 is turned off when the battery unit 130 is completed or discharge of the battery unit 130 is completed. That is, the display unit 340 is turned on or off based on the switching operation of the second switching unit Q5.

In general, a portable charging / discharging device has an external device connected to an output port, or when another portable charging / discharging device is connected to an output port and charged at the same time, when charging is completed, more current flows than when the external device is not connected. do.

However, in the portable charging / discharging device 300 according to an exemplary embodiment of the present invention, an external device is connected to the output port 120 and the charging of the battery 131 is completed, so that a large amount of current flows through the voltage generation block 310. However, the first voltage V5 and the second voltage V6 input to the comparison circuit 320 may be adjusted by adjusting the current I1 flowing through the resistor 311 through the switching of the switch 313. Accordingly, the comparison circuit 320 of the portable charge / discharge device 300 may output the first control signal Vo having the second level so that the display unit 340 may not be turned on.

5 is a view showing a portable charging / discharging device according to another embodiment of the present invention. Referring to FIG. 5, the portable charge / discharge device 400 includes an input port 110, an output port 120, a switching circuit 410, and a battery unit 130.

The input port 110 is connected to an external charger (not shown) when the portable charging / discharging device 400 is charged to supply the power voltage supplied from the external charger to the portable charging / discharging device 400.

The output port 110 supplies a voltage charged in the battery unit 130 to the connected external device when the portable charging / discharging device 400 discharges.

The switching circuit 410 supplies the input voltage supplied through the input port 110 to the external device through the output port 120 based on the first operating state P1 and based on the second operating state P2. The voltage supplied through the input port 110 is simultaneously supplied to the external device connected to the battery unit 130 and the output port 120. The first operating state P1 and the second operating state P2 are determined according to the arrangement of the contacts of the switches.

The switching circuit 410 connects the first terminal D1 and the second terminal D2 based on the first operating state P1, and connects the fourth terminal D4 and the fifth terminal D5. As a result, the switching circuit 410 connects the input port 110 and the output port 120 based on the first operating state P1 to convert the power supply voltage supplied through the input port 110 into the output port 120. It supplies directly to an external device connected to the output port 120 through, for example, a mobile phone or a PDA.

At this time, since the second terminal D2 and the third terminal D3 of the switching circuit 410 are not connected, the input port 110 and the battery unit 130 are not connected. Therefore, the power supply voltage supplied through the input port 110 is supplied only to the external device connected to the output port 120 through the output port 120.

The switching circuit 410 connects the second terminal D2 and the third terminal D3 based on the second operating state P2, and connects the fifth terminal D5 and the sixth terminal D6. As a result, the switching circuit 410 connects the input port 110 and the battery unit 130 based on the second operating state P1 and at the same time connects the input port 110 and the output port 120.

Therefore, when the external device is connected to the output port 120, the switching circuit 410 simultaneously supplies the power supply voltage supplied through the input port 110 to the battery unit 130 and the external device.

In addition, when no external device is connected to the output port 120, a power supply voltage supplied only to the battery unit 130 is supplied. In addition, when an external charger is not connected to the input port 110 and only an external device is connected to the output port 120, the external device supplies a charged voltage to the battery unit 130.

Although not shown, the switching circuit 410 may be implemented as a switch that is manually operated to switch between the first operating state P1 and the second operating state P2, and from an internal control signal generator (not shown). It may be implemented to switch automatically in response to the control signal output.

The battery unit 130 includes a battery 131 and a battery protection device 132 connected in series between the output terminal and the ground terminal of the switching circuit 410.

The battery 131 receives and charges a power voltage supplied through the input port 110 based on the second operation P2 of the switching circuit 410, or charges the charged voltage to an external device through the output port 120. Can discharge.

The battery protection device 132 operates when the battery 131 is overcharged or over discharged to protect the battery 131.

6A and 6B illustrate a portable charge / discharge device according to another embodiment of the present invention. 6A and 6B, the portable charging / discharging device 500 includes an input port 110, an output port 120, a battery unit 130, a detector 510, a voltage conversion circuit 520, and a detector. A circuit 140, a display unit 150, and a voltage supply circuit 530. The portable charge / discharge device 500 may further include an overcharge preventing unit 540.

The battery unit 130 includes a battery 131 and a battery protection device 132 connected in series between a first power line L1 and a second power line, for example, a line for supplying a ground voltage. The battery 131 charges a voltage supplied from an external charger connected to the input port 110 during a charging operation. In addition, the battery 130 supplies a charging voltage (or discharge voltage) to an external device connected to the output port 120 during the discharge operation.

The connection detector 510 generates a control signal EN based on whether the output port 120 is connected to an external device.

The connection detector 510 checks the voltage conversion circuit 520 in response to a voltage output from the external device, for example, a high level voltage, when an external device such as a mobile phone or a PAD is connected to the output port 120. The control signal EN for outputting is output. The connection detection unit 510 may be implemented as a MOSFET (eg, a PMOSFET or an NMOSFET) or a BJT (eg, an npn transistor or a pnp transistor). The voltage output from the external device may be input to the gate of the MOSFET or the base of the BJT.

The voltage conversion circuit 520 converts the voltage discharged from the battery unit 130 into a DC voltage in response to the control signal EN, and supplies the converted DC voltage to the external device through the output port 120.

For example, the voltage conversion circuit 520 is enabled in response to the control signal EN having a high level, converts the voltage discharged from the battery unit 130 into a DC voltage, and connects the DC voltage to the output port 120. Supply to external equipment.

The voltage conversion circuit 520 includes a reactor L, a diode D3, a voltage converter 521, a capacitor C1, and a resistor R31. The voltage converter 521 may be implemented as a DC-DC converter. The reactor L is connected between the first power supply line L1 and the input terminal of the voltage converter 521.

The diode D3 is connected in parallel between the input terminal and the output terminal of the voltage converter 521. The capacitor C1 is connected between the output terminal of the voltage converter 521 and the ground terminal GND.

The detection circuit 140 detects the charging voltage of the battery unit 130 during the charging operation of the battery unit 130, lights up the display unit 150 when the detected charging voltage is equal to or higher than the first reference voltage. If the detected voltage is higher than the second reference voltage, the display unit 150 is turned off. For example, the second reference voltage may be higher than the first reference voltage.

During the discharging operation of the battery unit 130, when the discharge voltage detected by the battery unit 130 is detected and the detected discharge voltage is equal to or lower than the second reference voltage, the display unit 150 is turned on, and the detected discharge voltage is the above-mentioned. If it is lower than the first reference voltage, the display unit 150 is turned off.

The display unit 150 displays a charging operation or a discharging operation of the battery unit 130.

Structures and functions of the detection circuit 140 and the display unit 150 are the same as those described with reference to FIG. 2, and thus a detailed description thereof will be omitted.

In the voltage supply circuit 530, an external charger may be connected to the input port 110 for the charging operation of the battery unit 130, or an external device may be connected to the output port 120 for the discharge operation of the battery unit 130. In this case, an operating voltage is supplied to the display unit 150.

The voltage supply circuit 530 includes a second diode D4 and a third diode D5. The second diode D4 is connected between the input port 110 and the input terminal of the display unit 150 to output the voltage supplied from the external device to the display unit 150 during the charging operation of the battery unit 130.

The third diode D5 is connected between the input terminal of the voltage conversion circuit 520 and the input terminal of the display unit 150 to display a voltage for turning on the display unit 150 during the discharge operation of the battery unit 130. ).

The portable charging / discharging device 500 may further include an overcharge preventing unit 540 for preventing overcharging of the battery unit 130. The overcharge preventing unit 540 includes a second resistor R32 and a fourth diode D6. The second resistor R32 is connected between the input port 110 and the node ND31 to limit the overcurrent flowing through the input port 110. The fourth diode D6 is connected between the node ND31 and the first power line L1 to prevent the reverse current from flowing into the node ND31.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

BRIEF DESCRIPTION OF THE DRAWINGS In order to better understand the drawings cited in the detailed description of the invention, a brief description of each drawing is provided.

1 is a schematic block diagram of a general portable charging / discharging device.

2 is a view showing a portable charging / discharging device according to an embodiment of the present invention.

3 is a view showing a portable charging / discharging device according to another embodiment of the present invention.

4 is a view showing a portable charge / discharge device according to another embodiment of the present invention.

5 is a view showing a portable charging / discharging device according to another embodiment of the present invention.

6A and 6B illustrate a portable charge / discharge device according to another embodiment of the present invention.

Claims (6)

In the portable charge / discharge device comprising an input port and an output port, A battery unit; A display unit for displaying a charging operation or a discharging operation of the battery unit; And In the charging operation of the battery unit, when the charging voltage of the battery unit is detected and the detected charging voltage is equal to or higher than the first reference voltage, the display is turned on and the second reference is higher than the first reference voltage. If the voltage is higher than the display unit is turned off, When the discharge voltage of the battery unit is detected, when the discharge voltage detected by detecting the discharge voltage of the battery unit is equal to or lower than the second reference voltage, the display is turned on and the detected discharge voltage becomes lower than the first reference voltage. And a detection circuit for turning off the display. The method of claim 1, wherein the detection circuit, In the charging operation of the battery unit, when the first voltage generated based on the charging voltage of the battery unit is equal to or higher than a first threshold voltage, a control signal having a first level is output, and the first voltage is the first threshold. A first control circuit for outputting the control signal having a second level when the voltage is lower than a voltage; A second control circuit outputting a voltage lower than the first threshold voltage as the first voltage when a second voltage generated based on the charging voltage is equal to or higher than a second threshold voltage during the charging operation of the battery; And And a switching circuit for turning on the display section in response to the control signal having the first level and turning off the display section in response to the control signal having the second level. According to claim 1, The portable charging / discharging device, And a voltage supply circuit for supplying a voltage to the display unit when an external charger is connected to the input port for the charging operation of the battery unit or an external device is connected to the output port for the discharge operation of the battery unit. Portable charge / discharge device. In the portable charge / discharge device comprising an input port and an output port, A battery and a battery protection device connected in series between the first power line and the second power line; A detection block which detects reverse current flowing from an external device connected to the output port and outputs a first control signal; And A protection circuit block configured to output a second control signal to the battery protection device in response to the first control signal, And the battery protection device is enabled / disabled in response to the second control signal. The method of claim 4, wherein the detection block, A voltage generator circuit for generating a first voltage and a second voltage based on the reverse current; And And a comparison circuit for outputting, as a first control signal, a voltage generated using the first voltage based on an output signal generated based on the voltage difference between the first voltage and the second voltage. The method of claim 4, wherein the protection circuit block, A first switching circuit outputting the second control signal in response to the first control signal; A display unit connected between the first power supply line and an output terminal of the first switching circuit and turned on or off in response to the second control signal; And And a second switching circuit for controlling the transmission of the second control signal to the battery protection device in response to the second control signal.

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