KR20020092859A - Portable charging apparatus having a charging battery built-in - Google Patents

Abstract

PURPOSE: A portable charging device for mounting a charging battery is provided to charge easily a battery of a cellular phone without using a domestic AC power source or a power source of a car. CONSTITUTION: An AC connection portion(11) is connected to a domestic AC power source. An EMI(Electro Magnetic Interference) filter(12) is used for removing noise of AC power. A rectifier portion(13) converts AC power to DC power. A switching mode power supply portion(14) outputs a charging current of a low voltage. An external charging battery connection portion(15) is connected to a charging battery of a cellular phone. A PWM(Pulse Width Modulation) control portion(16) controls a voltage level of a charging voltage. An internal charging battery(17) stores the charging current of the switching mode power supply portion(14) and supplies the stored charging current to the charging battery of the cellular phone. A photo coupler(18) converts a current control signal to an optical signal or the optical signal to an electric signal. A microprocessor(19) controls the switching mode power supply portion(14) and the PWM control portion(16) and outputs a current control signal and a voltage control signal.

Description

Portable charging apparatus having a charging battery built-in}

The present invention relates to a portable charging device of a mobile phone, a personal digital assistant (PDA), etc. (hereinafter referred to as a "mobile phone"), and particularly, even in places where it is difficult to use a home AC power source or a car power source, such as a mobile phone easily. It is about a portable charging device with a built-in rechargeable battery.

Conventional charging devices such as mobile phones include a desk top charger (DTC), a portable charger used by travelers, and a car charger using a cigar jack power of a vehicle as a charging power. The dual portable charger rectifies 110V / 220V AC power to DC power, and then uses the Switching Mode Power Supply (SMPS) to step down to DC power of a predetermined voltage level suitable for charging, thereby recharging a rechargeable battery such as a mobile phone. Will be charged.

1 is a perspective view showing the configuration of a conventional portable charging device.

In FIG. 1, reference numeral 1 is a charging device body with a switching mode power supply and a charging circuit, 2 is a power plug for connecting to a home power outlet, 3 is an interface jack for connecting to an interface connector of a mobile phone, and 4 Is a cable for connecting the charging device body 1 and the interface jack (3), 5 is a mobile phone, 6 is a household power outlet.

Therefore, when the interface jack 3 is connected to the interface connector of the mobile phone 5 and the power plug 2 is connected to the home power outlet 6, the power supply plug 2 is applied to the charging device body 1. The home AC power supply is converted into a DC power supply of a predetermined voltage level to charge the rechargeable battery of the mobile phone 5.

However, since the portable charger can be used only at a place having a power outlet 6 for supplying household AC power, there is a problem in that the charging operation cannot be performed at a place without the power outlet 6 or during a power failure during charging. Proposed to solve this problem is the above-described car charger.

However, this also has the inconvenience of not available when the user is far from the vehicle. In addition, a user who requires both the portable charger and the vehicle charger needs to purchase two chargers separately, so that it is difficult to carry, and costs more than necessary.

Accordingly, the present invention has been made in view of the above circumstances, to provide a portable charging device with a built-in rechargeable battery that can easily charge a rechargeable battery such as a mobile phone even in places where it is difficult to use household AC power and automotive power. There is this.

1 is a perspective view showing the configuration of a conventional portable charging device.

Figure 2 is a block diagram showing the internal configuration of a portable charging device with a built-in rechargeable battery according to an embodiment of the present invention.

3 is a perspective view illustrating an external configuration of a portable charging device incorporating the rechargeable battery illustrated in FIG. 2.

Figure 4 is a block diagram showing the internal configuration of a portable charging device with a built-in rechargeable battery according to another embodiment of the present invention.

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

11: AC power connection, 12: EMI filter,

13: rectifier, 14: switching mode power supply,

15: external rechargeable battery connection, 16: PWM control unit,

17: internal rechargeable battery, 18: photocoupler,

19: microprocessor, 20: car power connection,

100: charging device body, 111: power plug,

112: rotation axis, 113: insertion groove,

141: coil unit, 142: switching control unit,

151: cable, 152: interface jack.

A portable charging device with a built-in rechargeable battery according to the present invention for achieving the above object is a portable charging device for charging a rechargeable battery such as a mobile phone, the AC power connection for electrically connecting to the home AC power, and the AC power connection EMI filter for removing the noise component of the AC power applied through the rectifier, rectifier for rectifying the AC power applied through the EMI filter to the DC power, and DC power input through the rectifier according to a predetermined duty ratio A switching mode power supply for outputting a stepped down charging current, an external rechargeable battery connecting portion for electrically connecting to a rechargeable battery such as a mobile phone through an interface connector such as a mobile phone, and supplied to the external rechargeable battery connecting unit based on a predetermined voltage control signal. Current charging voltage to reach and maintain a predetermined reference voltage PWM control unit for outputting pulse width modulated signal for adjusting voltage level of voltage, DC power output from the switching mode power supply as charging current to store its electrical energy, and to convert the electrical energy into charging current such as mobile phone A transistor for switching an electrical connection between an output terminal of the switching mode power supply unit and a connection node between the internal rechargeable battery and the external rechargeable battery connection unit according to an internal rechargeable battery to be supplied, a pulse width modulation signal output from the PWM control unit, and a predetermined current; A photocoupler for converting a control signal into an optical signal, converting the optical signal into an electrical signal having the duty ratio, and applying it to the switching mode power supply unit; and a charging current of a predetermined voltage level output through the switching mode power supply unit. The switch to be supplied to the external rechargeable battery connection unit and the internal rechargeable battery. The microprocessor controls the charging current adjusting operation of the power supply unit and the charging voltage adjusting operation of the PWM controller, and outputs the current control signal and the voltage control signal so that the charging current of the internal rechargeable battery is supplied to the external rechargeable battery connecting unit. Characterized in that configured to include.

Further, in the present invention, the rechargeable battery connection unit receives predetermined identification data including the maximum charging voltage and the maximum charging current information of the rechargeable battery through an interface connector such as a mobile phone, and applies the predetermined identification data to the microprocessor, and the microprocessor reads the identification data. By setting the maximum charging voltage and the charging current value of the rechargeable battery, characterized in that configured to control the operation of the switching mode power supply and the PWM control unit based on this.

In addition, the present invention is further provided with a vehicle power connection for connecting to the cigar jack connection terminal of the vehicle to receive a DC voltage of a predetermined voltage level, the microprocessor is a charging current supplied from the auto power supply connection to the external rechargeable battery connection portion Characterized in that it is configured to control the charging voltage adjusting operation of the PWM control unit to be applied.

Therefore, according to the above configuration, it is possible to easily charge a rechargeable battery such as a mobile phone even in a place where it is difficult to use a household AC power source and an automobile power source.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a block diagram showing the internal configuration of a portable charging device with a built-in rechargeable battery according to an embodiment of the present invention.

In FIG. 2, reference numeral 11 denotes an AC power connector for electrically connecting an AC power source of 110V or 220V, which is a home power source, and 12 denotes an EMI for removing noise components of AC power applied through the AC power connector 11. (ElectroMagnetic Interference) filter, 13 is a rectifier for rectifying AC power applied through the EMI filter 12 to DC power.

In FIG. 2, reference numeral 14 denotes a switching mode power supply (SMPS) for supplying a charged current by stepping down the DC power input through the rectifying unit 13 according to a predetermined duty ratio. And a coil controller 141 for generating the induced current, and a switching controller 142 for controlling the amount of charge current flowing into the rechargeable battery by intermittently intercepting the coil unit 141 according to the duty.

In FIG. 2, reference numeral 15 denotes an external rechargeable battery connection unit for electrically connecting with a rechargeable battery such as a mobile phone through an interface connector such as a mobile phone, which uses an interface jack (not shown) connected to an interface connector such as a mobile phone.

In FIG. 2, the external rechargeable battery connection unit 15 includes a positive input terminal, a negative input terminal, and an identification data input terminal IN so as to be electrically connected to a charging terminal, a ground terminal, and an identification terminal of a rechargeable battery (not shown). The predetermined identification data ID transmitted from the identification terminal of the rechargeable battery is applied to the microprocessor to be described later through the identification data output terminal OUT. The identification data ID includes characteristic information such as a maximum charging voltage and a maximum charging current of the rechargeable battery.

In FIG. 2, reference numeral 16 denotes a voltage level of a current charging voltage such that the charging voltage supplied to the external rechargeable battery connecting unit 15 reaches and maintains a predetermined reference voltage based on a predetermined voltage control signal applied from a microprocessor, which will be described later. It is a PWM (Pulse Width Modulation) control unit that outputs a pulse width modulation signal to be adjusted.

In FIG. 2, the modulation signal output terminal of the PWM control unit 16 is connected to the base terminal of the transistor Q1, and the output terminal of the switching mode power supply unit 14 is connected to the transistor Q1 through the reverse current blocking diode D1. Is connected to the collector terminal of the external rechargeable battery connection unit 15, and is connected to the emitter terminal of the transistor Q1, and the emitter terminal is connected to the voltage feedback signal input terminal of the PWM control unit 16. .

In FIG. 2, reference numeral 17 denotes an internal rechargeable battery storing electrical energy by using the DC power output from the switching mode power supply 14 as a charging current, and the internal rechargeable battery 17 is supplied to the external rechargeable battery connecting portion 15. Function as a secondary charging power source.

In addition, the internal rechargeable battery 17 includes a predetermined overcharge preventing circuit for preventing overcharge therein, and the overcharge preventing circuit uses a well-known circuit, and a detailed description thereof will be omitted.

In FIG. 2, reference numeral 18 denotes a photo for converting a predetermined current control signal applied from a microprocessor, which will be described later, into an optical signal, converting the optical signal into an electrical signal having a predetermined duty ratio, and applying the same to the switching mode power supply unit 14. Photo coupler. The switching control unit 142 in the switching mode power supply unit 14 intervenes the operation of the coil unit 141 by using an electric signal applied through the photocoupler 18 as a control signal.

In FIG. 2, reference numeral 19 denotes the switching mode power supply unit 14 such that a charging current having a predetermined voltage level supplied through the switching mode power supply unit 14 is applied to the external rechargeable battery connection unit 15 and the internal rechargeable battery 17. The microprocessor controls the charging current adjusting operation and the charging voltage adjusting operation of the PWM controller 16.

The microprocessor 19 reads identification data ID of a corresponding rechargeable battery transmitted from the external rechargeable battery connector 15 when a rechargeable battery such as a mobile phone is connected to set a maximum charging voltage and a charging current value and based on the switching mode. The operation of the power supply unit 14 and the PWM control unit 16 is controlled.

3 is a perspective view illustrating an external configuration of the portable charging device incorporating the rechargeable battery illustrated in FIG. 2, and the same reference numerals are assigned to the same components as those illustrated in FIG. 2 in FIG. 3.

In FIG. 3, reference numeral 100 denotes a charging device body in which an internal configuration (electrical circuit) of the charging device described in FIG. 2 is inserted. One side of the charging device body 100 is attached to the AC power connection portion 11 formed with a power plug 111 to be connected to the home power outlet.

The power plug 111 is folded at right angles through the rotating shaft 112 provided inside the charging device body 100 and fixed to the surface of the charging device body 100 at right angles (indicated by dashed lines). In use, it is configured to be seated in the insertion groove 113 formed on one side of the charging device body 100.

In addition, one side of the charging device body 100 is attached to the external rechargeable battery connection unit 15, the cable 151, the interface jack 152 is formed to be electrically connected to the interface connector (see Fig. 1) such as a mobile phone, not shown The internal terminal of the cell phone interface connector is electrically connected to the positive terminal (+), the negative terminal (-) and the identification data input terminal (IN) of the external rechargeable battery connection unit 15 to transmit identification data of the rechargeable battery, and the present charging device The charging current is supplied from.

Hereinafter, the operation of the present invention having the above configuration will be described.

First, a case in which a rechargeable battery charging power source such as a mobile phone is 110V / 220V AC power for home use will be described. A user who wants to charge a mobile phone in a travel destination, etc., inserts the power plug 111 of FIG. 3 into a home power outlet, and connects the interface jack 152 of FIG. 3 to an interface connector such as a mobile phone.

After that, the AC power flowing through the AC power connection 11 of FIG. 2 passes through the EMI filter 12 and after the noise component is cut off, is rectified to the DC power by the rectifying unit 13, and the rectified DC power is switched. It is applied to the mode power supply 14, and supplies operating power to the present charging device through a predetermined operating power supply circuit (not shown).

The operating power of the present charging device basically uses a part of the DC power applied to the switching mode power supply 14 through the rectifying unit 13, and when using the internal rechargeable battery 17 as the charging power of the mobile phone rechargeable battery, Part of the power source is used as the operating power source. Description of the operating power supply circuit is a general content, and a detailed description thereof will be omitted.

Thereafter, the microprocessor 19 first applies a predetermined current control signal, which is a pulse width modulation signal, to the photocoupler 18 according to the preset maximum charging voltage and the maximum charging current amount of the internal rechargeable battery 17, and then connects the external rechargeable battery connection unit ( 15) Reading the identification data (ID) of the rechargeable battery such as a mobile phone transmitted from the set to set the maximum charging voltage and the maximum charging current of the rechargeable battery, and set the maximum charging voltage of the corresponding rechargeable battery as the reference voltage of the PWM controller 16 Done.

The photocoupler 18 outputs an electrical signal having a predetermined duty ratio to the switching controller 142 to correspond to the current control signal transmitted from the microprocessor 19, and the switching controller 142 outputs the duty ratio of the electrical signal. As a result, the operation of the coil unit 141 is interrupted to regulate the amount of charging current supplied to the external rechargeable battery connection unit 15 and the internal rechargeable battery 17.

On the other hand, the PWM controller 16 compares the voltage applied to the emitter terminal of the transistor Q1 and the connection node of the external rechargeable battery connection unit 15 with a predetermined reference voltage and the set reference voltage every predetermined period. The on / off driving period of the transistor Q1 is adjusted to reach and maintain the set reference voltage.

When the current charging voltage reaches the reference voltage, the PWM controller 16 notifies the microprocessor 19 of the current, and the microprocessor 19 based on the amount of the charging current output from the switching mode power supply unit 14 based on this. The predetermined current control signal is applied to the photocoupler 18 so as to decrease gradually.

That is, the microprocessor 19 first controls the operation of the switching mode power supply 14 according to the preset maximum charging voltage and the maximum charging current amount of the internal rechargeable battery 17, but the switching mode power supply according to the current charging voltage state of the mobile phone. The amount of charging current outputted from 14 is adjusted to prevent overcharging of the rechargeable battery connected to the external rechargeable battery connecting portion 15. When the internal rechargeable battery 17 reaches the full state, the internal rechargeable battery 17 detects the internal rechargeable battery through the internal overcharge prevention circuit to automatically block the inflow of the charging current.

According to the above operation, the charging current output from the switching mode power supply unit 14 not only charges the internal rechargeable battery 17 via the diode D1, but is also applied to the external rechargeable battery connection unit 15 to charge a rechargeable battery such as a mobile phone. It will be charged stably.

Hereinafter, a case where the rechargeable battery charging power such as a mobile phone is the internal rechargeable battery 17 will be described.

First, the internal rechargeable battery 17 is in a state of being charged by the above operation, and a user who wants to charge a mobile phone in a place where it is difficult to use home AC power connects the interface jack 152 of FIG. 3 to an interface connector such as a mobile phone. Let's go.

In this case, a part of the charging current of the internal rechargeable battery 17 is supplied to the present charging device as operating power through an operating power supply circuit (not shown).

Thereafter, the microprocessor 19 reads the identification data ID of the rechargeable battery such as a mobile phone transmitted from the external rechargeable battery connector 15 to set the maximum charging voltage and the maximum charging current of the corresponding rechargeable battery, and converts the maximum charging voltage into PWM. The reference voltage of the controller 16 is set.

In addition, the PWM controller 16 compares the current charging voltage of the rechargeable battery connected to the external rechargeable battery connection unit 15 with the set reference voltage so that the on / off driving cycle of the transistor Q1 is reached and maintained. To adjust the charging of the rechargeable battery.

In this embodiment, the internal charger 17 appropriately selects the charging voltage (for example, 8V or more) and the charging current amount to accommodate the charge capacity of the various rechargeable batteries connected to the external rechargeable battery connecting portion 15.

FIG. 4 is a block diagram illustrating an internal configuration of a portable charging device incorporating a rechargeable battery according to another embodiment of the present invention. In FIG. 4, the same components as those shown in FIG. 2 are denoted by the same reference numerals. The detailed description thereof will be omitted.

In FIG. 4, reference numeral 20 denotes an automobile power supply connection unit connected to a cigar jack connection terminal (not shown) of a vehicle so as to receive a DC power supply (hereinafter, referred to as “automotive power supply”) of a predetermined voltage level (eg, about 12V). .

In FIG. 4, a diode D2 is connected between the vehicle power supply connecting portion 20 and the connection node of the internal rechargeable battery 17 to block the inflow of current from the automotive power supply connecting portion 20 to the internal rechargeable battery 17. This is to prevent damage to the internal rechargeable battery 17 because the voltage level of the vehicle power source is generally greater than or equal to the maximum charging voltage of the internal rechargeable battery 17.

Therefore, when the maximum charging voltage of the internal rechargeable battery 17 is equal to or higher than the voltage level of the automotive power source, the diode D2 is removed, and the internal rechargeable battery 17 is charged while charging the rechargeable battery such as a mobile phone using the automotive power source. It is also possible to charge. And the charging operation using the automotive power source is the same as the charging operation using the internal rechargeable battery 17, a detailed description thereof will be omitted.

As described above, according to the present invention, a rechargeable battery such as a mobile phone is used not only to charge a rechargeable battery such as a mobile phone using household AC power or an automotive power source, but also to use an internal rechargeable battery in a device even in a place where it is difficult to use the household AC power or automobile power. It can be easily charged.

Claims (4)

In the portable charging device to charge a rechargeable battery such as a mobile phone, AC power connection for electrically connecting to home AC power, EMI filter for removing the noise component of the AC power applied through the AC power connection, Rectifier for rectifying AC power applied through the EMI filter to DC power, Switching mode power supply for outputting the charge current by stepping down the DC power input through the rectifier in accordance with a predetermined duty ratio, External rechargeable battery connector for electrically connecting to a rechargeable battery such as a mobile phone through the interface connector of the mobile phone, A PWM control unit outputting a pulse width modulation signal for adjusting a voltage level of a current charging voltage such that the charging voltage supplied to the external rechargeable battery connection unit reaches and maintains a predetermined reference voltage based on a predetermined voltage control signal; An internal rechargeable battery for storing the electrical energy using the direct current power output from the switching mode power supply as the charging current and supplying the electrical energy to the charging current such as a mobile phone, A transistor for switching an electrical connection between a connection node between the output terminal of the switching mode power supply unit and the internal rechargeable battery and the external rechargeable battery connection unit according to a pulse width modulation signal output from the PWM control unit; A photocoupler converting a predetermined current control signal into an optical signal and converting the optical signal into an electrical signal having the duty ratio and applying the same to the switching mode power supply unit; The charging current control operation of the switching mode power supply unit and the charging voltage control operation of the PWM control unit are controlled to supply the charging current having a predetermined voltage level outputted through the switching mode power supply unit to the external rechargeable battery connection unit and the internal rechargeable battery. And a microprocessor for outputting the current control signal and the voltage control signal to supply the charging current of the internal rechargeable battery to the external rechargeable battery connection unit. The method of claim 1, The rechargeable battery connection unit receives predetermined identification data including the maximum charging voltage and the maximum charging current information of the rechargeable battery through an interface connector such as a mobile phone, and applies the predetermined identification data to the microprocessor. The microprocessor is configured to read the identification data to set a maximum charging voltage and a charging current value of the rechargeable battery, and to control the operation of the switching mode power supply unit and the PWM controller based on the portable charger. . The method according to claim 1 or 2, The AC power connection portion is provided on one side of the charging device body and has a power plug connected to the home power outlet, The power plug is folded at right angles through a rotating shaft provided inside the charging device body and is fixed to the surface of the charging device body at a right angle when in use, and is configured to be seated in an insertion groove formed at one side of the charging device body when not in use. Portable charging device with built-in rechargeable battery. The method of claim 1, It is further provided with a car power supply connecting portion connected to the cigar jack connection terminal of the car to receive a DC power of a predetermined voltage level, The microprocessor is a portable charging device with a built-in rechargeable battery, characterized in that for controlling the charging voltage adjustment operation of the PWM control unit so that the charging current supplied from the automatic power supply connection portion is applied to the external rechargeable battery connection.