KR200299541Y1 - Charger for mobile phone - Google Patents

Abstract

The present invention relates to a charger, in particular to a mobile phone charger. According to the present invention, a first input unit connected to an AC adapter connected to a general AC power source (110V / 220V) or a vehicle power supply and a DC voltage is supplied, and a USB cable is connected to receive a DC voltage from a USB port of a computer. A second input unit, a voltage converting unit converting the DC voltage supplied from the first input unit into a voltage substantially equal to the DC voltage supplied from the second input unit, and outputting the DC voltage supplied from the voltage converting unit and the second input unit; Provided is a charger having a DC-DC converter for converting and outputting a voltage to a charging voltage. The charger may further include a controller for controlling the DC-DC converter. The charger may further include a voltage detector that detects the charging voltage and sends a signal to the controller. The charger may further include a current sensing unit that detects the charging current and sends a signal to the controller. The charger may further include a rectifier configured to rectify the voltage output from the DC-DC converter and to prevent a reverse current to the output terminal of the DC-DC converter.

Description

Mobile Phone Charger {CHARGER FOR MOBILE PHONE}

The present invention relates to a charger, in particular to a mobile phone charger.

Currently widely used mobile phone chargers are classified into using general household AC power (110V or 220V) and in-car cigar jack DC power (12V or 24V) according to the type of power used. Chargers using home AC power are again divided into desktop and travel. The table top has a cradle provided to securely couple the mobile phone body to which the rechargeable battery is coupled or the rechargeable battery separated from the mobile phone body. Inside the cradle is equipped with an AC adapter and various controls. The tabletop is convenient to use without moving in a fixed place, but it is inconvenient to carry because of its relatively large holder. Therefore, a travel charger may be used instead of a desktop. The travel charger includes a connector and a control unit which are integrally formed with a plug connected to a power source and an AC adapter and inserted into a mobile phone connection connector provided at a lower part of a mobile phone. Since the travel charger does not have a cradle, it is relatively small in size compared to the table top, and is easy to carry.

A charger using a cigar jack DC power in a vehicle is provided with a power plug (hereinafter referred to as CLA (Cigarette Lighter Adapter)) connected to the cigar jack and a cradle to which a rechargeable battery or a mobile phone body is mounted (mobile phone connection connector of a mobile phone instead of a cradle). It may be provided with a connector inserted into). Inside the cradle, various controllers are provided, including a converter for dropping a voltage. A charger using a cigar jack can be used to easily charge a rechargeable battery in a vehicle.

Recently, chargers are being used that charge by connecting to a USB port on a computer (including a laptop computer).

The mobile phone charger is charged from a power source having various voltages as described above to charge a DC by applying a constant voltage / constant current to a rechargeable battery. In this case, various controllers of the charger control the direct current applied to the charger to maintain the constant voltage and the constant current.

As described above, the mobile phone can be charged by various methods. However, there was a inconvenience in that a charger suitable for each charging method was required. In order to reduce the inconvenience, there is a charger having a combination of the two functions so that it can be charged from both the home AC power supply and the vehicle DC power supply. However, the existing product is provided with a charging circuit including each control unit connected to the home AC power supply and the vehicle DC power supply separately, and the output from each charging circuit is connected to one at the output of the charger is configured to charge the mobile phone . Also, these conventional chargers are not configured to use the computer's USB port together.

It is an object of the present invention to provide a charger capable of charging a rechargeable battery of a mobile phone using various power sources. Another object of the present invention is to provide a mobile phone charger using various power sources, but operated by an integrated charging circuit. Another object of the present invention is to provide a mobile phone charger miniaturized for easy portability.

1 is a perspective view of a mobile phone charger according to an embodiment of the present invention, showing the external connection device for supplying power to the mobile phone and the charger;

Figure 2 is a block diagram showing the operation of the mobile phone charger of Figure 1

3 is a circuit diagram of a voltage converter of FIG.

<Description of the symbols for the main parts of the drawings>

10: charger 20: first input unit

22: second input unit 30: voltage conversion unit

40: DC-DC converter 50: control IC

60: rectifier 70: voltage detector

75: current sensing unit 80: output unit

According to an aspect of the present invention, the first input unit is connected to the AC adapter or a vehicle power supply connected to a general AC power supply and a DC voltage,

A second input to which a USB cable is connected to receive a DC voltage from a USB port of the computer;

A voltage converter converting the DC voltage supplied from the first input unit into a voltage substantially equal to the DC voltage supplied from the second input unit, and outputting the same;

There is provided a charger having a DC-DC converter for converting and outputting a DC voltage supplied from the voltage converter and the second input unit to a charging voltage.

The charger may further include a controller for controlling the DC-DC converter.

The charger may further include a voltage detector that detects the charging voltage and sends a signal to the controller.

The charger may further include a current sensing unit that detects the charging current and sends a signal to the controller.

The charger may further include a rectifier configured to rectify the voltage output from the DC-DC converter and to prevent a reverse current to the output terminal of the DC-DC converter.

According to another aspect of the present invention, a USB connection receptacle connected to an external power source, a DC power connection receptacle,

A charging circuit equipped with a connector for connecting the mobile phone,

Including a housing surrounding the charging circuit,

The USB connection receptacle, the DC power connection receptacle and the mobile phone connection connector are provided with a charger having a fixed position with respect to the housing.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

Referring to FIG. 1, one side of the charger 10 includes an AC adapter 5 and a first input unit 20 having a receptacle to which the CLA 6 is connected, and a USB cable at a lower end of the charger 10. A second input 22 having a receptacle to which 7 is connected is provided. The upper end of the charger 10 is provided with an output unit 80 having a connector that is inserted into the connection connector 95 provided in the lower end of the mobile phone (90). The AC adapter 5 receives power of AC 110V / 220V, which is a commercial power source such as a home, converts it into a DC and outputs it to the charger 10. Usually the output rating is 12V, 300mA or 12V, 500mA (the present invention is not limited to this). The CLA 6 receives a DC power supply of 12V (a passenger car) or a 24V (large car) from a cigar jack provided in a passenger car or a large car and supplies it to the charger 10 as it is. Although not shown, a fuse is mounted inside the CLA 6. The USB cable 7 is connected to a USB port of a computer (including a laptop computer) to supply DC 5V power to the charger 10.

Referring to FIG. 2, the charger 10 includes a control IC 50 constituting the first and second input units 20 and 22, the voltage converter 30, the DC-DC converter 40, and a controller. ), A rectifier 60, an output 80, a voltage detector 70, and a current detector 75. The AC adapter 5 or the CLA 6 is connected to the first input unit 20 to input a DC 12V or DC 24V power supply. The USB cable 7 is connected to the second input unit 22 to input DC 5V power. The DC 12V current input through the first input unit 22 is sent to the voltage converter 30.

The voltage converter 30 is a part for changing the DC current of 12V or 24V input from the AC adapter 5 and the CLA 6 into a voltage (for example, 5V) that can be easily controlled and outputting the same. The voltage converter 30 changes the input voltage (DC 10.8 to 33V) from the predictable first input unit 20 to 5V, which is an input voltage from the second input unit 22. The execution method is a Buck (or STEP-DOWN) method, and a Schottky diode and an inductor are used for this purpose. The voltage converter 30 is a PWM (Pulse Width Modulator) IC (for example, Promax-Johnton, Taiwan). The manufactured pj34063) controls the output voltage to maintain a constant voltage. The PWM IC operates from a charger's output, which is separated by a resistor and fed back. As a preferred example of the voltage converter 30, the voltage converter 30 may be configured as shown in the circuit diagram of FIG. In FIG. 3, KA34063A manufactured by Fairchild Semiconductor was used as the PWM IC.

Referring to FIG. 2, a DC voltage of 12 V or 24 V is supplied from the AC adapter 5 or the CLA 6 through the first input unit 20. In addition, a DC voltage of 5V is supplied from the USB cable 7 through the second input unit 22. Since different DC voltages are input through the first input unit 20 and the second input unit 22, in order to generate a charging voltage with one controller, a charging circuit in which the different DC voltages are united and inputted into one should be configured. Otherwise, a charging circuit having a respective control unit for each input unit should be provided. In order to equalize the DC voltage from the first input unit 20 and the DC voltage from the second input unit 22, in this embodiment, the DC voltage from the first input unit 20 is changed to change the DC voltage from the second input unit 22. Configure the same as the voltage. It is the voltage converter 30 that serves this function. The DC voltage of 12V or 24V supplied through the first input unit 20 is equal to the DC voltage of 5V supplied through the second input unit 22 while passing through the voltage conversion unit 30. Therefore, regardless of the type of power, the same DC 5V electricity is applied to the DC-DC converter 40 to be described later, thereby minimizing the configuration of the charging circuit. In addition, the DC voltage of 5V output from the voltage converter 30 may be directly applied to the output of the charger as shown in FIG. 2 in addition to the DC-DC converter 40 to be connected to the mobile phone 90. . This is to comply with the matters enforced by the charger standard of the TTA.

The DC-DC converter 40 is composed of a transistor or a field effect transistor (FET). The DC-DC converter 40 receives DC 5V of electricity from the voltage converter 30 and the second input unit 22 and is provided to the mobile phone during charging. It converts into a charging voltage (for example, direct current 4.2V), and outputs it. Since the value output from the DC-DC converter 40 actually charges the mobile phone, the operation of the DC-DC converter 40 should be controlled so that its output value is strictly maintained with the specified charging voltage and charging current. This control is performed by the control IC 50 described later.

The control IC 50 is configured to maintain the constant voltage / constant current such that the value output from the DC-DC converter 40 (the charging voltage and the charging current supplied to the rechargeable battery of the mobile phone 90 at the time of charging) is maintained. 40) to control the operation of the IC. There are four examples of ICs that can be used in consideration of current or future product specifications. Commercial IC-specific products are as follows.

In the above table, the storage temperature is a range of temperatures to be maintained when the IC is stored, and the operating temperature is a range of temperatures at which the corresponding characteristics can be obtained when the IC is mounted and operated in the charger.

In addition to the characteristics of accurate charging voltage and charging current, the ICs have low voltage detection and full charge detection functions.

The rectifier 60 is composed of a diode, and rectifies the value output from the DC-DC converter 50 into a more complete DC component, and prevents reverse current to the output terminal of the DC-DC converter 50. do.

The output unit 80 may be manufactured according to a corresponding standard (for example, divided into domestic and Japanese) as a part connected to the connection connector (95 of FIG. 1) of the actual mobile phone 90.

The voltage detector 70 detects the voltage of the output unit in order to maintain the charging voltage and returns the signal to the control IC 50. The control IC 50 receiving this signal sends out a control signal for operating the DC-DC converter 40 to maintain a constant voltage.

The current sensing unit 75 is a part for checking the current charging current and returning this signal to the control IC 50 in order to maintain the charging current at a constant current. The control IC 50 receiving this signal sends out a control signal for operating the DC-DC converter 40 to maintain a constant current. Depending on the type of control IC 50 used, the method of checking (i.e., configuration) may be changed somewhat, but the method of checking the low resistance connected to the ground path and the low resistance connected to the + path of the output terminal are mainly detected. It will be understood by those skilled in the art that the circuit can be constructed using the method.

Now, with reference to Figure 2 will be described in detail the operation of each component of the charger in the process of charging the mobile phone. Referring to FIG. 2, a current of DC 12V or DC 24V input through the first input unit 20 is input to the voltage converter 30. The voltage conversion unit 30 converts the input DC 12V (or 24V) current into DC 5V and outputs the same. The current of DC 5V output from the voltage converter 30 is input to the DC-DC converter 40. The current of DC 5V input through the second input unit 20 is directly input to the DC-DC converter 40. The DC-DC converter 40 converts the input 5V current into a charging voltage (usually applied at 4.2V) that is actually charged in the mobile phone and outputs the converted voltage. Since the current output from the DC-DC converter 40 actually charges the mobile phone, the operation of the DC-DC converter 40 should be controlled so that its output value strictly maintains the specified charging voltage and charging current.

Control of the DC-DC converter 40 is performed by the control IC 50. The control IC 50 controls the transistor or FET which is a component of the DC-DC converter 40. The value output from the DC-DC converter 40 is input to the rectifier 60. The rectifier 60 serves to prevent rectification and reverse current to the output terminal of the DC-DC converter 40. The value output from the rectifier 60 is input to the output unit 80 to apply a charging voltage / current to the mobile phone (90). At this time, the voltage detector 70 detects the charging voltage from the output value of the rectifier 60 to maintain the desired charging voltage. The voltage detector 70 outputs the control IC 50 using the charging voltage. The current sensing unit 75 checks the charging current from the output value of the output unit 80. The current sensing unit 75 outputs the value to the control IC 50 again.

With the above configuration, the AC adapter 7 in the home, the CLA 6 built in the fuse only in the vehicle, the USB cable 7 in the office, etc., carry only the charger and carry the mobile phone 90 The rechargeable battery can be conveniently charged.

In the above embodiment, the charger has been described as charging the mobile phone. However, the present invention is not limited thereto. It will be appreciated by those skilled in the art that the present invention can be applied to charging other electronic products (eg, PDAs).

In addition, although not shown, the charger may be manufactured in a belt clip type or key ring type so as to be easily carried.

Using a mobile phone charger according to the configuration of the present invention, it is possible to charge a variety of power sources can be charged anywhere. In addition, since the control unit for each power source is composed of one charging circuit integrated, it can be made more compact and easy to carry.

Although the present invention has been described with reference to the above embodiments, the present invention is not limited thereto. Those skilled in the art will appreciate that modifications and changes can be made without departing from the spirit and scope of the present invention and that such modifications and changes also belong to the present invention.

Claims (6)

A first input unit connected to an AC adapter connected to a general AC power source or a vehicle power supply to supply a DC voltage; A second input to which a USB cable is connected to receive a DC voltage from a USB port of the computer; A voltage converter converting the DC voltage supplied from the first input unit into a voltage substantially equal to the DC voltage supplied from the second input unit, and outputting the same; And a DC-DC converter configured to convert the DC voltage supplied from the voltage converter and the second input into a charging voltage and output the charged voltage. The charger of claim 1, wherein the charger further comprises a control unit for controlling the DC-DC converter. The charger of claim 2, further comprising a voltage detector configured to detect the charging voltage and transmit the signal to the controller. The charger according to claim 2, further comprising a current sensing unit for detecting the charging current and sending a signal to the controller. The rectifier according to any one of claims 1 to 4, further comprising a rectifier configured to rectify the voltage output from the DC-DC converter and to prevent a reverse current to the output terminal of the DC-DC converter. charger. A USB connection receptacle connected to an external power source, a DC power connection receptacle, A charging circuit equipped with a connector for connecting the mobile phone, Including a housing surrounding the charging circuit, And the USB connection receptacle, the DC power connection receptacle, and the mobile phone connection connector are fixed in position with respect to the housing.