KR20090059015A - Battery charger using usb - Google Patents

Abstract

A battery charger using an USB is provided to perform battery chare easily by using a USB(Universal Series Bus) of an electronic device. A battery charger using an USB is connected with an external device having the USB. The battery charger includes a PCB(Printed Circuit Board), a base plate(200), a chare circuit, connection terminals, an USB plug(500). More than one battery slot(120) is formed at the center of the PCB, and the base plate is formed at one side of the battery slot in order to hold the battery. The charge circuit is formed on the PCB in order to control charge of the battery. The USB plug is connected to the USB connector of the external device in order to supply power to the charge circuit.

Description

Battery charger using USS {BATTERY CHARGER USING USB}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery charging apparatus and method using a USB (Universal Serial Bus, hereinafter referred to as "USB"), and more particularly, to a printed circuit board (PCB) on which circuit components are mounted. First, the small size, light weight, and thin film are provided by supplying charging power using USB after providing a space where a battery is inserted in the center, a binding portion for fixing the battery, a USB plug, and the like. It can be configured to be easy to carry and use, second, inexpensive, third, computer, set-top box (SET-TOP BOX) such as to enable easy charging of the battery using USB equipped electronic devices.

In addition, by providing a practical and simple charging circuit, the configuration is simple, inexpensive, and trouble-free.

As is well known, a battery may be classified into a battery having a voltage of 1.2 V per cell and a battery having a voltage of 1.5 V per cell.

Examples of batteries having a voltage of 1.2 V per cell include nickel-cadmium (Ni-Cd) batteries, lithium-ion (Li-ion) batteries, and nickel-hydrogen (Li-MH) batteries. Due to this it is classified as a rechargeable battery that can be recharged.

Examples of batteries having a voltage of 1.5V per cell include manganese (MnO 2) batteries and alkaline (Alkaline) batteries. Due to chemical properties, manganese batteries are used as disposable batteries and alkaline batteries are used as rechargeable batteries.

For reference, all alkaline batteries can be recharged due to their chemical structure and can be reversible. However, due to the manufacturing process, they are divided into disposable batteries and rechargeable batteries.

Rechargeable rechargeable batteries are charged using a constant current charging method, a constant voltage charging method, or a microcurrent charging method according to the chemical characteristics and charging conditions of each battery.

In charging the battery, whether the battery is fully charged or not is determined by detecting a voltage of the battery, detecting a temperature change generated during charging, or detecting an amount of current flowing into the rechargeable battery.

FIG. 2 shows a configuration of a conventional charging device. As shown in the drawing, in the voltage conversion unit 1 and the voltage conversion unit 1 which converts 220V commercial AC power into AC power having a low voltage (for example, 6V). And a rectifying section 2 for converting the output AC power into a DC power supply, a charging circuit 3 for controlling charging to the battery 4, and a full charge detecting section 5 for detecting whether the battery is fully charged.

The voltage converter 1 is composed of a transformer, the rectifier 2 is composed of a bridge rectifier circuit and a smoothing circuit, and the charging circuit 3 keeps the current charged in the battery 4 constant. It is generally composed of a constant current section 3a, a constant voltage section 3b for keeping the charging voltage constant, and an operation display section 3c for displaying the charging state.

The full charge detection unit 5 detects a temperature, a voltage, or a current of a battery and performs an operation of applying it to the charging circuit 3.

The conventional charging device configured as described above converts the applied 220V commercial AC power into DC power through the voltage converter 1 and the rectifier 2, and then charges the battery 4 through the control of the charging circuit 3. Done. At this time, the full charge detection unit 5 detects whether the battery 4 is fully charged and applies it to the charging circuit 3.

3 is a perspective view showing an example of the charging device 10 configured as described above.

However, the conventional charging device as described above, first, there is a problem that the volume is large due to the structure for interpolating and fixing the battery, and second, the component for converting 220V commercial AC power into battery charging power (voltage conversion unit , Rectification unit, etc.), such as bulky, heavy, poor energy efficiency, and the price is increased.

This will be described as follows.

As is well known, in order to perform charging, the battery must be connected to the charging power supply terminal, and the battery must be fixed at the time of connection. For this purpose, the battery is conventionally inserted and fixed inside the charging device as shown in FIG. It has a structure that can be, due to this there is a problem that the volume is as large as the space is inconvenient to carry.

That is, there is a problem that the volume becomes large because the space of the battery size (“AAA size”, “AA size”, etc.) to be charged and the space of the number of batteries to be charged simultaneously must be secured. .

In addition, the conventional charging device has a problem that the volume is bulky, heavy, and the price is increased because of the voltage conversion through the transformer.

Accordingly, as described in Korean Patent Registration No. 0392184, "Charging Device for Portable Device Using Computer", and Korean Patent Registration No. 0561045, "Rechargeable Battery Protection System for Portable Electronic Device Using USB", etc. A charging device has been proposed.

Fig. 4 is a block diagram showing the structure of a pre-registered patent "portable device charging device using a computer", 21 is an adapter charging terminal, 22 is a charging circuit, 23 is a charging state indicator, and 24 is a computer. Connection line 25 denotes a computer connection port (USB plug), respectively.

These pre-patent patents perform a function of charging a portable electronic device by receiving a DC power supply using a computer USB.

However, the pre-registered patent as described above is simplified and miniaturized by eliminating the components of the power converter 1 and the rectifier 2 because the charging power is supplied using a computer USB, but a separate connection line or connector There was a problem that can not charge the battery without.

In addition, when the battery itself exists as an independent product such as a "AA size" or "AAA size" battery, the battery cannot be charged without a separate battery holder and a connection connector, and a battery having a different charging voltage can be charged. This is not possible, and there is a problem in that it is inconvenient to carry and use since the battery charger of the integrated thin film cannot be implemented.

An object of the present invention is to solve the above-mentioned conventional problems, in particular, after the battery is inserted into the center of the PCB and the binding portion for fixing the battery in the insertion space, using a USB to supply the battery charging power By providing a compact, lightweight, thin film, and easy to use and inexpensive "battery charger using USB".

In other words, by providing a battery insertion space in the center of the PCB, by fixing the battery by installing a binding portion made of a magnet on one side of the insertion space, by forming a USB plug at the end of the PCB, a thin, compact, lightweight battery charger device will be.

When the case is used, a magnet is installed inside one side of the insertion space into which the battery is inserted, or the battery is forcedly fitted by the elasticity of the case, thereby providing a thin film, a small size, and a lightweight battery charger.

Another object of the present invention is to provide a battery charging circuit using a practical and simple USB.

In the present specification, for convenience of description, the space in which the battery is inserted is provided in the PCB as the "insertion space", and the case provided in the case is referred to as the "insertion space". Same as below.

In order to achieve the above object, the configuration 1 of the present invention "battery charger using USB" is,

In the battery charging apparatus using the USB to charge the battery using a USB of the external device by connecting to an external device equipped with a USB,

The battery charger,

A PCB having at least one insertion space into which a battery is inserted;

A binding part provided at one side of the insertion space to fix the battery;

A charging circuit unit configured in the PCB to control battery charging;

Connection terminals provided at the front and rear of the insertion space to electrically connect the battery and the charging circuit unit; And,

And a USB plug for supplying power to the charging circuit unit by connecting to the USB connector of the external device.

The binding unit is characterized by consisting of one or more magnets to fix the battery by a magnetic force.

The binding unit is a separate structure or case for fixing a battery by mounting a small magnet (for example, rare earth magnet, ferrite magnet, alico magnet, etc.) with strong magnetic force to one side of the insertion space to fix the battery by the magnetic force of the magnet. The battery can be fixed without it.

The magnet is characterized in that it is surrounded by a magnetic material other than the battery contact surface.

These magnets are intended to exclude the generation of magnetic force in areas other than the battery contact surface.

In other words, by concentrating the magnetic material only on the battery contact surface to prevent the occurrence of the magnetic material on the other surface to solve the problem caused by the magnetic force.

The charging circuit unit,

DC power conversion unit for converting the power supplied through the USB plug to the battery charging voltage;

A filler fisherman detecting whether the battery is fully charged and generating a signal indicating the battery;

A switching unit connected between the battery and the DC power conversion unit and switched according to a signal applied from the charging control unit to control battery charging; And,

And a charge display unit connected to the DC power converter and the charge control unit to indicate a state of charge of the battery according to a signal applied from the charge control unit.

In the above configuration, characterized in that it further comprises a current control unit connected between the switching unit and the battery to control the current charged in the battery.

The DC power converter is characterized in that to lower the voltage by using the forward voltage drop characteristics of the diode.

The DC power converter is to make a circuit cheaply and simply by dropping the voltage using a diode.

This will be described as follows.

As is well known, diodes have various forward voltage drop characteristics by product, and the voltage drop depends on the amount of current flowing through the diode, the voltage and temperature between both ends, and the like.

Therefore, the desired voltage drop can be achieved by dividing the voltage to be stepped down by the forward drop voltage of the diode and mounting the number of diodes.

For example, if five diodes with a forward drop voltage of 0.65V are connected in series, a voltage drop of 3.25V can be achieved, converting the 5V voltage applied via USB to 1.75V.

In practice, a combination of a forward drop voltage of a diode and a drop voltage of a switching transistor is used to convert a desired charge voltage.

The DC power converter is characterized in that the voltage is reduced by using a three-terminal regulator.

For example, the voltage applied to the adjust terminal of the LM317 may be adjusted to output a desired voltage.

Since the configuration and operation of the three-terminal regulator are well known, detailed description thereof will be omitted.

The DC power converter, characterized in that for boosting the voltage using any one of a booster circuit, or a switching regulator.

The DC power converter is used to charge, for example, a 6V, 9V, or 12V battery when the charging voltage of the battery to be charged is higher than the positive voltage supplied from the USB.

Since the configuration and operation effects of the double voltage circuit and the switching regulator (for example, MC34063, etc.) are well known, detailed description thereof will be omitted.

The charging control unit may detect a charging voltage of the battery and generate a signal indicating that the voltage of the battery reaches the full charging voltage.

For example, after connecting two resistors connected in series to the battery in parallel, a signal indicating the voltage at the common connection point of the resistor when the voltage reaches a predetermined voltage (voltage representing full charge) is shown. Can be configured to generate

The charging control unit may be configured to further include a switch that is operated by a user to set a voltage indicating full charge.

The charging control unit may charge both batteries having different charging voltages (for example, a battery having a voltage of 1.2V per cell and a battery having a voltage of 1.5V per cell) by varying a voltage recognized as full charging according to the operation of the switch. It is to make it possible.

The charging control unit is configured to detect a temperature of the battery and generate a signal indicating that the temperature of the battery reaches a temperature indicating a full charge.

It uses the characteristic that the temperature of the battery rises rapidly when the battery is fully charged. For example, the temperature of the battery is detected by using the negative resistance characteristic (or the constant resistance characteristic) of the temperature sensor. If it is determined that has reached the can be configured to generate a signal indicating this.

Since the circuit configuration and operation of detecting whether the battery is fully charged using the temperature change characteristic of the battery according to the charging are well known, the detailed description thereof will be omitted.

Preferably, the switching unit is composed of a switching transistor, a FET, a Darlington transistor, or the like switched according to a signal applied from the charge control unit.

The switching unit is switched according to a control signal applied from the charging control unit to turn on / off the power supply.

The charging display unit connects the first LED through a resistor between a positive power supply and a ground, and connects a second LED through a resistor between a common connection point of the first LED and a resistor and a positive power source. The common connection point of the first LED and the second LED is grounded according to a control signal of the charging control unit, but the first LED and the second LED are not turned on at the same time by the serial connection of the first LED and the second LED. It is characterized by displaying the charging status and the charging completion indication by setting the positive power supply voltage.

Such a charge display part is designed to reduce the cost, eliminate the cause of failure, and to miniaturize the circuit configuration by controlling the display during charging and the charge completion display with a small number of parts.

For example, the first LED is a red LED that is turned on at 2.1V or higher, the second LED is a green LED that is turned on at 3.5V or higher, and the positive power is + 4V. When the common connection point of the first LED and the second LED is not connected to the ground potential, the first LED is turned on to be charged, and the common connection point of the first LED and the second LED is grounded. When connected to the potential, only the second LED is on, indicating completion of charging.

That is, according to the signal applied from the charge control unit it is possible to control the display during charging and the charge completion display as a single control signal.

The switching unit and the current control unit are composed of a switching element (transistor, FET, etc.), two diodes connected in series, and a resistor.

Two diodes connected with a current limiting resistor between a positive power supply and a positive power supply connection terminal of a switching element (transistor, FET, etc.), and connected in series between the switching control terminal of the switching element and a positive power supply. After connecting to, characterized in that configured to perform the switching operation and the constant current supply operation at the same time by connecting the switching control terminal of the switching element to the control signal output terminal of the charging control unit.

In addition, the charging circuit unit,

A power converter configured to switch according to a control signal applied from a microcomputer to convert power supplied through a USB plug into a battery charging voltage;

A charge detector detecting a battery charge state and applying the same to the microcomputer;

A display unit indicating a battery charge state and an operation state according to a control signal applied from the microcomputer; And,

Connected between the power converter, the charge detector, and the display unit, first, a voltage to be supplied to the battery is calculated from a signal for a battery charge state applied by the charge detector, so that the output voltage of the power converter is equal to the calculated voltage. And a microcomputer applying a control signal to the power conversion unit, and secondly, applying a control signal indicating a charging state and an operating state to the display unit.

In the above configuration, it is characterized in that it further comprises an operation switch unit which is operated by the user, and connected to the microcomputer to set the battery charge voltage.

The operation switch unit can be used to charge a battery having a voltage of 1.2V or a battery of 1.5V by setting a charging voltage that varies depending on the type of battery (battery having a voltage of 1.2V per cell and a battery having a voltage of 1.5V per cell). I would have to.

The microcomputer preferably comprises an input / output terminal, a microcomputer having an operation module, a memory, and optionally an A / D converter function or a watchdog (WATCH-DOG) function.

The positive electrode of the connection terminal is characterized in that the supporting piece on which the positive electrode of the battery is placed.

The support piece is formed in a semicircle having the same curvature as the outer diameter of the battery (+) electrode.

The support piece supports the battery (+) electrode to prevent the battery from falling down.

The USB plug is characterized in that formed on the PCB.

This is to form a USB plug pattern on the front end of the PCB to perform the USB plug function so that the PCB itself acts as a USB plug without using a separate USB plug.

When the USB plug is formed at the front end of the PCB, the PCB uses a PCB having the same thickness as the height of the USB connector, or a separate auxiliary pad is attached to the back of the PCB to be fitted to the USB connector.

Insertion space of the PCB is characterized in that it is biased toward one side of the PCB.

Insertion space of the PCB is characterized in that part or all of the battery size.

The insertion space is designed to be the same size as the battery size so that the battery is fully inserted, or to minimize the size by configuring only a portion of the battery to be inserted.

Insertion space of the PCB is characterized in that arranged on the left and right.

This insertion space allows the battery to be charged at the same time up to two batteries by mounting the battery on the left and right.

Insertion space of the PCB is characterized in that arranged in succession back and forth.

This insertion space is used to charge up to two batteries at the same time using the vertically spaced insertion space.

Insertion space of the PCB is characterized in that arranged in succession to the front and rear on the left and right sides.

This insertion space is to enable the simultaneous charging of up to four batteries using the four insertion spaces provided on the left and right and front and rear.

Insertion space of the PCB is characterized in that placed in the center so that two batteries can be connected at the same time.

This insertion space allows the simultaneous charging of up to two batteries using the insertion space formed in the center of the PCB.

Insertion space of the PCB is characterized in that placed in the center so that two batteries at the same time can be connected to the front and rear at the same time.

This insertion space is used to charge up to four batteries at the same time using the insertion space formed in the center of the PCB.

Configuration 1 according to the technical concept of the present invention configured as described above, by configuring the battery insertion space and the USB plug on the PCB, by attaching the binding portion, the connection terminal and the charging circuit portion to be used without a case, small, lightweight, thin film battery It is to provide a charging device.

On the other hand, the configuration 2 of the present invention "battery charger using USB",

In the battery charging apparatus using the USB to charge the battery using a USB of the external device by connecting to an external device equipped with a USB,

The battery charger,

A charging circuit unit configured on a PCB to control battery charging;

A case in which the PCB is installed and has at least one insertion space into which a battery is inserted;

A binding part provided at one side of the insertion space to fix the battery;

Connection terminals provided at the front and rear of the insertion space to electrically connect the battery and the charging circuit unit; And,

And a USB plug for supplying power to the charging circuit unit by connecting to the USB connector of the external device.

The insertion space of the case is characterized in that the inner surface has the same curved surface as the outer diameter of the battery and the battery is interference fit.

The case in which the insertion space is formed is for fixing the battery separately from the binding portion.

The insertion space of the case is such that the inner surface is configured to be the same surface as the outer diameter of the battery so that the battery can be fitted, the curved surface is characterized in that the lower portion with respect to the horizontal center of the battery.

The case in which the insertion space is formed is intended to support and support the battery by the curved surface.

The insertion space of the case is characterized in that it is disposed on the left and right sides.

This insertion space allows the battery to be charged at the same time up to two batteries by mounting the battery on the left and right.

The insertion space of the case is characterized in that arranged in succession to the front and rear.

This inserting space is used to charge up to two batteries at the same time using a vertically arranged inserting space.

Insertion space of the case is characterized in that arranged in succession to the front and rear on the left and right sides.

This insertion space is to be able to charge up to four batteries at the same time using the four insertion spaces provided in the left and right and front and rear.

The insertion space of the case is characterized in that disposed in the center so that two batteries can be connected at the same time.

This insertion space is used to charge up to two batteries at the same time using the insertion space formed in the center of the case.

The insertion space of the case is characterized in that disposed in the center so that the two batteries can be connected simultaneously in front and rear.

This insertion space is used to charge up to four batteries at the same time using the insertion space formed in the center of the case.

On the other hand, configuration 3 of the present invention "battery charger using USB",

In the battery charging apparatus using the USB to charge the battery using a USB of the external device by connecting to an external device equipped with a USB,

The battery charger,

A PCB having at least one insertion space into which a battery is inserted;

A binding part provided at one side of the insertion space to fix the battery;

A charging circuit unit configured in the PCB to control battery charging;

Connection terminals provided at the front and rear of the insertion space to electrically connect the battery and the charging circuit unit;

A USB plug connected to a USB connector of the external device to supply power to the charging circuit unit; And,

The PCB is built-in, the case having one or more insertion space in which the battery is inserted in the center; characterized in that the configuration comprises a technical configuration.

Configurations 2 and 3 according to the present invention configured as described above are intended to fix the battery by configuring a thin film case in addition to the features of the configuration 1.

In the present invention configured as described above, the "battery charging device using USB" is, in particular, the center of the PCB, or the case in which the battery is inserted into the space and the binding portion for fixing the battery and the USB plug, using a USB By supplying charging power, first, it can be configured as small size, light weight, and thin film, so it can be easily carried and used. Second, it is inexpensive. Third, it is easy to use battery by using electronic devices equipped with USB such as computer It is a very useful invention with the effect of charging.

In addition, by providing a practical and simple charging circuit, there is an effect that it is possible to provide a battery charger with a simple configuration, low cost, and trouble-free.

Hereinafter, the technical idea of the present invention "battery charger using USB" configured as described above will be described in detail with reference to the embodiment.

In the description, components having the same or similar functions will be given the same names and symbols for convenience of description.

Example 1

Embodiment 1 is an embodiment of the configuration 1 according to the technical idea of the present invention.

Therefore, the first embodiment will be described with an example that all the components mounted on the PCB without a case.

In addition, the first embodiment will be described with an example that one insertion space is provided on the PCB to charge one alkaline battery, and the binding unit is described with an example in which one small magnet is installed in the middle of the insertion space. do.

In the first embodiment, the insertion space is provided on the right side of the PCB, and the size of the insertion space is set to the left side of the vertical line to include the battery (+) electrode as an example.

In addition, in the first embodiment, the USB plug is formed in a PCB pattern at the front end of the PCB by way of example.

In addition, in the first embodiment, the charging circuit unit will be described by using a DC power conversion unit, a charging control unit, a switching unit, a charge display unit and a current control unit as an example.

In this case, the DC power conversion unit converts a voltage using a diode, the charge control unit is composed of two transistors constituting a voltage divider connected in series and a multi-arlington circuit connected to a common connection point of the voltage divider. The two LEDs and the current control unit are described using an example of a current limiting resistor.

In the first embodiment, the positive electrode of the connecting terminal will be described as an example in which a supporting piece having the same curvature as the outer diameter of the battery (+) electrode is formed.

Note that the charging current in the first embodiment is about 190 mA as an example.

The reason why the first embodiment is constituted as described above is that another embodiment according to the technical idea of the present invention can be easily understood from the first embodiment.

Hereinafter, the configuration of the first embodiment will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 5, the USB plug 500 is formed in a PCB pattern at the front end of the PCB 100, and the battery BAT is disposed in the longitudinal direction at the bottom right of the PCB 100 on which the USB plug 500 is formed. The insertion space 120 is provided to be mounted, and the (+) electrode 110 and the (-) electrode 140, which are connection terminals, are mounted on the front and the rear of the insertion space 120, and then the insertion space. The first embodiment is constructed by attaching a magnet 200 forming a binding portion to an intermediate portion of the 120.

The magnet surrounds a surface other than the battery contact surface with a magnetic material (eg, an iron plate, etc.) to generate magnetic force only on the battery contact surface.

6 shows the (+) electrode 110 in which the support piece 111 is formed in a right direction.

On the other hand, as shown in FIG. 8, after the DC power converter 310, the switching unit 320, the current control unit 330, the battery BAT, and the charging control unit 340 are sequentially connected, The charging display unit 350 is connected to the DC power conversion unit 310, and the switching unit 320 and the charging display unit 350 are connected to the control signal output terminal of the charging control unit 340 to charge according to the first embodiment. The circuit unit 300 is configured.

In the first embodiment, the DC power converter 310 includes four diodes D1 to D4 connected in series, the switching unit 320 includes a switching transistor TR1, and the current control unit 330. ) Is configured as a current limiting resistor R5, and the charging control unit 340 connects the two resistors R7 and R9 in series and connects them in parallel to the battery BAT. The common connection point is formed by connecting the bases of the transistors TR2 and TR3 that make the Darlington connection.

In this case, the two transistors TR2 and TR3 constituting the multi-arling tone connection may be composed of one multi-arlington transistor or one transistor having an appropriate amplification degree, or a FET or an OP amplifier.

In addition, the charging display unit is connected to the red LED (LED1) through the current limiting resistors (R1, R3) between the output terminal of the diode (D1) and the ground to indicate "charging", and the output terminal of the diode (D2) and The green LED (LED) is connected between the current limiting resistor (R1) and the common connection point of the red LED (LED1) through the resistor (R2) to display a "charging complete" display. In this case, the common connection point of the red LED (LED1) and the green LED (LED2) is connected to the collector terminals of the Darlington connection transistors TR2 and TR3, which are output terminals of the charge control unit 340.

Hereinafter, the operation and the effect of the first embodiment configured as described above will be described.

First, as shown in FIG. 7, the alkaline battery BAT requiring charging is mounted in the insertion space 120 of the PCB 100, and then the USB plug 500 formed on the PCB 100 is connected to a computer. To a USB connector (not shown).

Then, the positive electrode of the battery BAT is seated on the supporting piece 111 formed on the positive electrode 110 of the ground terminal, and the negative electrode of the battery BAT is the negative electrode of the ground terminal. It is connected to 140 and makes an electrical connection.

The negative electrode 140 is configured to have elasticity, and the battery BAT is fixed by the magnet 200 in an electrical connection state made by the elasticity of the negative electrode 140. .

The magnetic force of the magnet 200 is selected to be sufficient to fix the battery.

Since the negative electrode of the connection terminal is formed by bending an elastic body or using a spring, such a structure and operation are well known, and thus, detailed description thereof will be omitted.

In the drawings, reference numeral 130 denotes a PCB pattern, and 150 denotes circuit components mounted on the PCB 100.

On the other hand, the (+) 5V DC power supplied through the USB plug 500 is dropped to about 1.65V by the four diodes (D1 ~ D4) and the switching transistor (TR1) constituting the DC power converter 310. do.

This will be described as follows.

As shown in FIG. 10, the forward drop voltage of the diode is changed according to the amount of current flowing through the diode.

In the first embodiment, since the current charged in the battery BAT is 190 mA, as shown in FIG. 10, each of the diodes D1 to D4 drops by about 0.79 V, and the voltage drops by about 0.2 V in the transistor. Is generated, a voltage of about 1.65V is output to the output terminal of the switching unit 320 to be supplied to the battery BAT.

In this case, the resistor R5 constituting the current controller 330 is a value set such that a current supplied to the battery BAT is 190 mA.

The charge control unit 340 connected in parallel to the battery BAT is configured to turn on the transistors TR2 and TR3 that make a Darlington connection when the battery BAT is fully charged. When the battery BAT is fully charged, the transistor ( TR2) and (TR3) are turned on to turn off the switching transistor TR1, and at the same time, the red LED (LED1) is turned off and the green LED (LED2) is turned on.

This will be described as follows.

The red LED used in Example 1 has an operating voltage of 2.1V and a green LED has 3.5V.

Therefore, in the loop of "(R2)-(LED2)-(LED1)-(R3)" formed between the diode D2 and the ground when the battery BAT is charging, the red LED (LED1) and the green LED are Only the red LED (LED1) is turned on to indicate that it is charging because it is not a voltage capable of lighting all of the (LED2), and the transistors (TR2) and (TR3) that have completed the battery (BAT) charging and make a multi-arling connection When the cathode (CATHODE) of the green LED (LED2) is connected to the ground potential, the green LED (LED2) is turned on to indicate that the charging is completed, the red LED (LED1) is turned off and the switching transistor (TR1) is turned off. .

That is, when charging of the battery BAT is not completed, the red LED LED1 lights up and the switching transistor TR1 is turned on to indicate that the battery BAT is being charged. The green LED (LED2) is turned on and the red LED (LED1) and the switching transistor (TR1) are turned off to indicate that charging is completed.

FIG. 11 shows an example in which the DC power converter 310 is configured using a three-terminal regulator (for example, LM317). FIG. 12 uses transistors TR21, diodes D21 and D22, and resistors R21. It serves to provide a constant current at the same time as switching.

FIG. 13 is a perspective view illustrating a battery BAT insertion space in the center of the PCB 100 and a magnet 200 constituting the binding portion mounted on the negative electrode 140 of the connection terminal.

Example 2

Embodiment 2 is an embodiment of Configuration 3 according to the technical idea of the present invention.

Therefore, the second embodiment will be described with an example in which the PCB having the insertion space is installed in the case having the insertion space.

In addition, in the second embodiment, one insertion space and one insertion space will be described as an example so that one battery can be charged in the same manner as in the first embodiment, and the binding portion includes one small magnet (-) of the connection terminal. The mounting on the electrode will be described as an example.

In addition, in the second embodiment, the insertion space is described as an example provided in the center of the PCB, and the insertion space is provided at the same position as the insertion space as an example.

In addition, in the second embodiment, a USB plug is provided in a PCB pattern at the distal end of the PCB in the same manner as in the first embodiment.

In addition, in the second embodiment, the charging circuit section will be described with an example consisting of the display section, the operation switch section, the microcomputer, the charging detection section, and the power conversion section.

The microcomputer will be described with an A / D converter function as an example.

In addition, in the second embodiment, a battery having a voltage of 1.2 V per cell and a battery having a voltage of 1.5 V per cell will be selected and charged through the operation switch unit as an example.

In the second embodiment, the positive electrode of the connection terminal will be described as an example in which a supporting piece having the same curvature as the outer diameter of the battery (+) electrode is formed as in the first embodiment.

The reason why the second embodiment is configured as described above is that other embodiments according to the technical idea of the present invention can be easily understood from the second embodiment.

Hereinafter, the configuration of the second embodiment will be described in detail with reference to the accompanying drawings.

First, as shown in FIG. 14, the USB plug 500 is formed in a PCB pattern at the front end of the PCB 100, and the battery BAT is disposed in the longitudinal direction at the bottom center of the PCB 100 on which the USB plug 500 is formed. The insertion space 120 is provided to be mounted, and after connecting the (+) electrode 110 and the (-) electrode 140, which are the connection terminals, to the front and the rear of the insertion space 120, the connection terminal The magnet 200 forming the binding portion is mounted on the negative electrode 140.

Thereafter, as shown in FIG. 15, the PCB 100 having the charging circuit unit is mounted between the upper case 610 and the lower case 620 to configure the second embodiment.

At this time, the binding surface 630 having the same curved surface as the outer diameter of the battery BAT is formed on the inner surface of the case 600 in which the battery BAT is in contact in the longitudinal direction so that the battery BAT is interfitted and fixed. .

FIG. 16 is a cross-sectional view taken along the line AA ′ of FIG. 15.

In the second embodiment, as shown in Fig. 18, the charging circuit unit connects the charge detection unit 430 and the operation switch unit 440 to the input terminal of the microcomputer 420, and displays the display unit at the output terminal of the microcomputer 420. 410 and the power converter 450 are connected to each other.

In this case, the charge detector 430 is connected to the A / D converter input terminal of the microcomputer 420.

The charge detector 430 connects both ends of the resistors R37 and R38 connected in series to the battery BAT in parallel, and then connects the common connection points of the resistors R37 and R38 to the A / D of the microcomputer 420. It is configured by connecting to an input terminal, and the power conversion unit 450 includes a buck circuit 451 and a current limiting resistor 452.

The display unit 410 also includes a red LED (LED31) indicating charging, a green LED (LED32) indicating completion of charging, a yellow LED (LED33) indicating battery charging with a voltage of 1.2 V per cell, and a voltage per cell. A blue LED (LED34) indicating a 1.5 V battery charge is connected to the microcomputer 420 so as to be turned on under the control of the microcomputer 420, and an operation switch SW for selecting a charging voltage of the battery BAT. ) Is connected to the microcomputer 420.

Hereinafter, the operation and the effect of the second embodiment configured as described above will be described.

First, a voltage of a battery to be charged is selected by operating the operation switch SW of the operation switch unit 440.

For example, if the battery to be charged is a battery having a voltage of 1.2 V per cell, such as a nickel ion battery or a nickel hydride battery, select the operation switch (SW) as the corresponding contact point.

Subsequently, as shown in FIG. 15, when the battery BAT to be charged is mounted in the insertion space 650 of the case 600, the USB plug 500 is connected to a USB connector (not shown) such as a computer. Power is supplied through the plug 500 to operate the microcomputer 420.

Then, the microcomputer 420 is charging by turning on the red LED (LED31) and the yellow LED (LED33), indicating that the battery with a voltage of 1.2 V per cell is being charged and the output voltage is 1.4 at the power converter 450. The battery BAT is output by outputting a pulse signal to be V, and the voltage of the battery BAT is continuously detected through the charge detector 430.

The operation of the buck circuit constituting the power converter 450 and the A / D converter operation for determining whether the set value is reached by A / D conversion of the voltage applied through the charge detector 430 are well known. Since the same, detailed description thereof will be omitted.

On the other hand, when the battery BAT is fully charged and the battery BAT is fully charged, the microcomputer 420 detects this and turns on the green LED (LED32) indicating completion of charging, and then turns to the power conversion unit 450. The charging operation is completed by stopping the output pulse signal.

That is, the battery BAT is charged by converting a voltage of (+) 5V applied through the USB plug 500 into a voltage required for charging, and informs the state of charge.

1 is a perspective view showing an example of a battery charging device having a insertion space biased to the right.

As described above, embodiments according to the spirit of the present invention are very useful to provide a thin film, a small size, and a lightweight battery charging device by fixing a battery using a binding unit and supplying operating power using a USB. Invention.

However, the above embodiments have been described with an example in which only one battery can be charged and charged, but the technical spirit of the present invention is not limited thereto.

That is, as shown in FIG. 20, insertion spaces (or insertion spaces) are provided on the left and right sides of the PCB to simultaneously charge two batteries, or as shown in FIG. 21, the insertion spaces (or insertion spaces) are moved forward and backward. Alternatively, as shown in FIG. 22, an insertion space (or insertion space) may be provided at the left and right sides and back and forth to allow a maximum of two batteries to be charged simultaneously, or two batteries at the center as shown in FIG. 24 can be simultaneously mounted, or as shown in FIG. 24, the battery can be simultaneously charged up to 4 batteries by arranging the insertion space (or insertion space) in which the two batteries can be mounted at the same time. can do.

In addition, in the above embodiments, the charging circuit unit has been described as an example of charging one battery, but the technical spirit of the present invention is not limited thereto.

That is, the battery connection terminals may be connected in parallel to charge the batteries to be charged in parallel, or the charging circuit units may be installed as many as the number of batteries to enable independent charging.

In addition, in the above examples, the USB plug has been described using an example of using a PCB pattern at the tip of the PCB. However, the technical spirit of the present invention is not limited thereto.

That is, it can be configured by mounting a separate USB plug.

In addition, although the charging circuit parts described in Embodiments 1 and 2 are configured differently in the above embodiments, it is noted that each charging circuit part is not limited to the embodiment.

In addition, although the power conversion unit is configured using the buck circuit in the charging circuit unit of the second embodiment, it can be understood that other voltage variable circuits can be used within the scope without departing from the technical idea of the present invention.

That is, it can be configured using a BOOST circuit, a BUCK-BOOST circuit, or a CUK circuit and other boosting circuits or decompression circuits.

In addition, in the second embodiment described above by forming a binding surface 630 inside the case 600 to force the battery to fit, as shown in Figure 17, as shown in Figure 17, the outer diameter of the battery It is to be configured to the same curved surface, but it is to be understood that the curved surface can be configured to form a support surface 640 to support the lower portion with respect to the horizontal center line of the battery.

In addition, in the embodiments of the present invention, although the binding unit is configured using one magnet, it can be understood that it can be configured using a plurality of magnets.

In addition, in the above embodiments, the charging control unit or the charging detection unit has been described as an example of connecting the resistors connected in series to the battery in parallel to detect the charging voltage of the battery, but the technical idea of the present invention is not limited thereto. To reveal.

That is, the temperature sensor may be mounted on one side of the insertion space (or insertion space), and then configured to detect the completion of charging by detecting the temperature of the battery.

In addition, in the first embodiment, it is configured to charge only a battery having a voltage of 1.5 V per cell, like an alkaline battery. However, as shown in FIG. 9, a resistor is connected to a voltage divider R7 or R9 for detecting a battery voltage. Can be configured to selectively charge a battery having a voltage of 1.2 V per cell by a selection operation of the switch SW.

In addition, in Example 2, the battery is fixed by using both the magnet constituting the binding portion and the binding surface of the case, but the battery is fixed using only the binding portion or the binding surface. Let's find out.

1 is a perspective view showing an embodiment of the present invention "battery charger using the USB",

2 is a circuit block diagram showing a configuration of a conventional battery charger;

3 is a perspective view of a conventional battery charger;

4 is a view showing a configuration of a conventional "portable device charging device using a computer",

5 is a configuration diagram showing another embodiment of the present invention "battery charger using USB",

6 is a perspective view illustrating main parts of a positive electrode structure of a connection terminal according to the present invention;

7 is a perspective view showing another embodiment of the present invention "battery charging device using USB",

8 is a block diagram showing a configuration of a charging circuit unit according to the present invention;

9 is a circuit diagram illustrating an embodiment of the configuration of FIG. 8;

10 is a graph showing a forward characteristic of a diode;

11 is a circuit diagram showing another configuration of the DC power conversion unit in the present invention;

12 is a circuit diagram showing another configuration of the switching unit and the current control unit in the present invention;

Figure 13 is a perspective view showing another embodiment of the present invention "battery charger using the USB",

14 is a configuration diagram showing yet another embodiment of the "battery charger using the USES";

15 is a perspective view showing still another embodiment of the present invention "battery charger using USB";

Figure 16 is a cross-sectional view taken along the line A-A 'of Figure 15 showing the binding surface of the case in the present invention,

17 is a cross-sectional view showing a support surface of the case in the present invention,

18 is a block diagram showing another configuration of a charging circuit unit according to the present invention;

19 is a circuit diagram illustrating an embodiment of the configuration of FIG. 18;

20 is a configuration diagram showing yet another embodiment of the "battery charger using the USES";

21 is a block diagram showing another embodiment of the present invention "battery charger using USB",

22 is a block diagram showing another embodiment of the present invention "battery charger using the USB",

23 is a block diagram showing another embodiment of the present invention "battery charging using USB",

24 is a block diagram showing another embodiment of the present invention "battery charger using the USB".

   Explanation of symbols on the main parts of the drawings

100: PCB 110: (+) electrode

111: base 120: insertion space

130: PCB pattern 140: (-) electrode

150: circuit component 200: binding portion

300, 400: charging circuit 310: DC power conversion unit

320: switching unit 330: current control unit

340: charge control unit 350: charge display unit

410: display unit 420: microcomputer

430: charge detection unit 440: operation switch unit

450: power conversion unit 500: PCB plug

600: case 610: upper case

620: lower case 630: binding surface

640: support surface 650: inserting space

Claims (33)

In the battery charging apparatus using the USB to charge the battery using a USB of the external device by connecting to an external device equipped with a USB, The battery charger, A PCB having at least one insertion space into which a battery is inserted; A binding part provided at one side of the insertion space to fix the battery; A charging circuit unit configured in the PCB to control battery charging; Connection terminals provided at the front and rear of the insertion space to electrically connect the battery and the charging circuit unit; And, And a USB plug for supplying power to the charging circuit unit by connecting to the USB connector of the external device. In the battery charging apparatus using the USB to charge the battery using a USB of the external device by connecting to an external device equipped with a USB, The battery charger, A charging circuit unit configured on a PCB to control battery charging; A case in which the PCB is installed and has at least one insertion space into which a battery is inserted; A binding part provided at one side of the insertion space to fix the battery; Connection terminals provided at the front and rear of the insertion space to electrically connect the battery and the charging circuit unit; And, And a USB plug for supplying power to the charging circuit unit by connecting to the USB connector of the external device. In the battery charging apparatus using the USB to charge the battery using a USB of the external device by connecting to an external device equipped with a USB, The battery charger, A PCB having at least one insertion space into which a battery is inserted; A binding part provided at one side of the insertion space to fix the battery; A charging circuit unit configured in the PCB to control battery charging; Connection terminals provided at the front and rear of the insertion space to electrically connect the battery and the charging circuit unit; A USB plug connected to a USB connector of the external device to supply power to the charging circuit unit; And, And a case having one or more insertion spaces in which the PCB is internally inserted and a battery is inserted in the center of the PCB. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the binding unit is composed of one or more magnets which fix the battery by magnetic force. [5] The apparatus for charging a battery according to claim 4, wherein the magnet surrounds a surface other than a battery contact surface with a magnetic material. The charging circuit unit according to any one of claims 1 to 3, wherein DC power conversion unit for converting the power supplied through the USB plug to the battery charging voltage; A charging control unit which detects whether the battery is fully charged and generates a signal indicating this; A switching unit connected between the battery and the DC power conversion unit and switched according to a signal applied from the charging control unit to control battery charging; And, And a charge display unit connected to the DC power conversion unit and the charge control unit to indicate a state of charge of the battery according to a signal applied from the charge control unit. 7. The battery charging apparatus according to claim 6, further comprising a current control unit connected between the switching unit and the battery to control a current charged in the battery. The apparatus of claim 6, wherein the DC power converter is configured to lower the voltage using the forward voltage drop characteristic of the diode. The apparatus of claim 6, wherein the DC power converter converts the voltage using a three-terminal regulator. The apparatus of claim 6, wherein the DC power converter is configured to boost the voltage by using one of a booster circuit and a switching regulator. The apparatus of claim 6, wherein the charging control unit further comprises a switch operated by a user to set a voltage indicating full charge. The apparatus of claim 6, wherein the charge control unit is configured to detect a temperature of the battery and generate a signal indicating the temperature of the battery when the temperature of the battery reaches a temperature indicating full charge. The display device of claim 6, wherein the charge display unit connects the first LED through a resistor between a positive power supply and a ground, and a second through a resistor between a common connection point of the first LED and the resistor and a positive power supply. After the LED is connected, the common connection point of the first LED and the second LED is grounded according to a control signal of the charging control unit, and the first LED and the second LED are connected by series connection of the first LED and the second LED. The battery charging device using the USB, characterized in that the display of the charging and the completion of the charge display by setting the (+) power supply voltage so as not to light at the same time. 7. The switching device and the current control unit according to claim 6, wherein the switching unit and the current control unit are composed of a switching element (transistor, FET, etc.), two diodes connected in series, and a resistor. The current limiting resistor is connected between the (+) power supply connection terminal of < RTI ID = 0.0 >, < / RTI > two diodes connected in series between the switching control terminal and the (+) power supply of the switching element, and then the switching control terminal of the switching element is And a switching operation and a constant current supply operation simultaneously by connecting to a control signal output terminal of the charging control unit. The charging circuit unit according to any one of claims 1 to 3, wherein A power conversion unit which is switched according to a control signal applied from a microcomputer and converts power supplied through a USB plug into a battery charging voltage; A charge detector detecting a battery charge state and applying the same to the microcomputer; A display unit indicating a battery charge state and an operation state according to a control signal applied from the microcomputer; And, Connected between the power converter, the charge detector, and the display unit, first, a voltage to be supplied to the battery is calculated from a signal for a battery charge state applied by the charge detector, so that the output voltage of the power converter is equal to the calculated voltage. And a microcomputer for applying a control signal to the power conversion unit, and secondly, applying a control signal indicating a charging state and an operating state to the display unit. 2. 16. The battery charging apparatus according to claim 15, further comprising an operation switch unit which is operated by a user and connected to the microcomputer to set a battery charging voltage. The battery charging device using a USB according to any one of claims 1 to 3, wherein the (+) electrode of the connection terminal is provided with a support piece on which the (+) electrode of the battery is placed. 18. The apparatus for charging a battery according to claim 17, wherein the support piece is formed in a semicircle having the same curvature as the outer diameter of the battery (+) electrode. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the USB plug is formed on a PCB. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the insertion space of the PCB is biased toward one side of the PCB. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the insertion space of the PCB is part or all of the battery size. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the insertion space of the PCB is disposed at left and right sides. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the insertion space of the PCB is disposed in front and rear. [4] The battery charging device according to any one of claims 1 to 3, wherein the insertion spaces of the PCBs are arranged in the front and rear in the front and rear sides. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the insertion space of the PCB is centrally arranged so that two batteries can be connected at the same time. 4. The battery charging apparatus according to any one of claims 1 to 3, wherein the insertion space of the PCB is disposed at the center so that two batteries can be simultaneously connected in front and rear. The battery charging apparatus according to any one of claims 2 to 3, wherein the insertion space of the case has an inner surface having the same curved surface as the outer diameter of the battery and the battery is fitted with interference. 4. The inserting space of the case according to claim 2 or 3, wherein the insertion space of the case is configured such that an inner surface of the case has a curved surface that is the same as the outer diameter of the battery so that the battery can be inserted therein. Battery charging device using the USSR, characterized in that the supporting part. The battery charging apparatus according to any one of claims 2 to 3, wherein the insertion space of the case is disposed at left and right sides. The battery charging apparatus according to any one of claims 2 to 3, wherein the insertion space of the case is arranged in front and rear. The battery charging apparatus according to any one of claims 2 to 3, wherein the insertion space of the case is disposed in front and rear successively in the left and right sides. 4. The battery charging apparatus according to any one of claims 2 to 3, wherein the insertion space of the case is disposed at the center so that two batteries can be connected at the same time. The battery charging apparatus according to any one of claims 2 to 3, wherein the insertion space of the case is disposed at the center so that two batteries can be simultaneously connected to each other in front and rear.

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