CN201075714Y - Multifunctional USB charger - Google Patents

Abstract

The utility model relates to a pair of multifunctional USB charger, its technical essential lies in: the USB interface device comprises a USB input plug which can be connected with external equipment and is used for receiving the power supply of the external equipment; a booster circuit connected to the USB input plug and capable of converting a received low power into a high power output; the output plug is connected with the booster circuit and used for outputting the high power supply output by the booster circuit to the external equipment for charging; and a battery is also connected between the USB input plug and the booster circuit, and the battery can receive the power supply of the external equipment through the USB input plug and also can charge the external equipment through the booster circuit and the output plug. The utility model discloses can make things convenient for when the cell-phone does not have the electricity in order to play emergent effect. The utility model discloses circuit structure is simple, electronic component is few, with low costs.

Description

A multifunctional USB charger

[technical field]

The utility model relates to a charger, in particular to a USB charger.

[Background technique]

Mobile phones have now become an indispensable communication tool in people's lives. At present, most mobile phones are charged with the power charger provided by the manufacturer. When charging, connect one end of the power charger to the household power supply, and the other end to the mobile phone or The battery connection removed from the mobile phone can realize charging. However, the power charger must be connected with the household power supply. When there is no external power supply, the mobile phone is out of power, and the power charger will lose its function.

Now there are some USB chargers on the market, but their functions are relatively single. They can only directly take out the power from the external power supply and transmit it to the mobile phone. The prior art is improved, and a mobile phone charger with emergency function is developed to solve the above problems.

[utility model content]

The utility model overcomes the disadvantages of the above-mentioned technologies, and provides a multifunctional USB charger with a simple circuit structure and capable of charging mobile phones in an emergency.

In order to achieve the above object, the utility model adopts the following technical solutions:

The utility model relates to a multifunctional USB charger, which is characterized in that: it includes a USB input plug, which can be connected with an external device to receive the power of the external device; a boost circuit, which is connected to the USB input plug Connection, which can convert the received low power into high power output; output plug, which is connected to the boost circuit, and outputs the high power output by the boost circuit to external devices for charging;

A battery is also connected between the USB input plug and the boost circuit, and the battery can receive the power of the external device through the USB input plug, and can also charge the external device through the boost circuit and the output plug.

A multifunctional USB charger as described above is characterized in that: the USB input plug can be connected to a power adapter with a USB socket, and the power adapter is connected to an external AC power source.

A multifunctional USB charger as described above is characterized in that it also includes a display circuit capable of displaying the working status, which is connected with the USB input plug and the boost circuit.

A multifunctional USB charger as described above is characterized in that: the boost circuit includes a single-chip microcomputer, its enabling terminal is connected to the positive pole of the USB input plug, and the driving output terminal of the single-chip microcomputer is connected to the gate of the MOS tube through a resistor , The drain of the MOS tube is connected to the positive pole of the Zener tube, the negative pole of the Zener tube is connected to the positive pole of the output plug, the source of the MOS tube is grounded, and the feedback terminal is connected between the positive and negative poles of the output plug.

The beneficial effects of the utility model are:

1. When the battery is not installed in this utility model, the USB input plug is directly inserted into the USB socket on the external power supply, and the output plug is inserted into the socket of the mobile phone, so that the external power supply can be conveniently charged for the mobile phone; no external high voltage is required power supply;

2. When the battery is installed in the utility model, the USB input plug is directly inserted into the USB socket on the external power supply, and the external power supply can be conveniently charged for the battery; when people’s mobile phone is out of power, the output plug is inserted into the The socket can be used to charge the mobile phone, so as to play an emergency role.

3. Connect the USB plug directly to the power adapter with USB socket, connect the power adapter to the external power supply, and then toggle the control switch to conveniently connect the external power supply to charge the battery; when the mobile phone is out of power, plug the USB plug into the The mobile phone can be charged at the mobile phone socket to play an emergency role.

4. The circuit structure of the utility model is simple, the electronic components are few, and the cost is low.

[Description of drawings]

Below in conjunction with accompanying drawing and embodiment of the present utility model, further describe in detail:

Fig. 1 is a block diagram of the utility model;

Fig. 2 is a circuit diagram of the utility model.

[Detailed ways]

As shown in Figure 1, a multifunctional USB charger includes a USB input plug 1, a boost circuit 2, and an output plug 3 connected in sequence, the USB input plug 1 can be connected to an external power supply, and the positive pole of the USB input plug 1 It is connected to the positive pole of the USB interface of the external power supply, and the negative pole of the USB input plug 1 is grounded to receive the power of the external power supply; the booster circuit 2 can convert the low-voltage power received from the USB input plug into a high-voltage power output; output The plug 3 outputs the high-voltage power outputted by the booster circuit 2 to the external device for charging; the voltage boosted by the booster circuit 2 can be raised to 5.6V required by the external device.

A battery 4 is also connected between the USB input plug 1 and the booster circuit 2, the positive pole of the battery 4 is connected to the positive pole of the USB input plug 1, and the negative pole of the battery 4 is grounded. The battery 4 can receive power from an external power supply through the USB input plug 1 , and can also charge external devices through the boost circuit 2 and the output plug 3 . The battery voltage is 2.4V, and the booster circuit 2 can boost it to the voltage 5.6V required by the external device.

The utility model can also be used in conjunction with a power adapter. The USB plug is directly inserted to connect with the power adapter with a USB socket, the power adapter is connected to the external AC power supply, and then the toggle control switch can conveniently realize the external AC power supply as a battery. Charging; when people's external device is out of power, plugging the USB plug into the external device socket can realize charging for the external device, so as to play an emergency role.

As shown in Figure 2, the utility model also includes a display circuit 5 capable of displaying the working state, which is connected with the USB input plug 1 and the booster circuit 2; the display circuit 5 includes a light-emitting diode LED1, and the negative pole of LED1 is connected to the negative pole of the regulator tube D1 , the anode of the regulator tube D1 is connected to the anode of the USB input plug 1; the anode of the light-emitting diode LED1 is connected to the boost circuit 2 through the resistor R1.

The boost circuit 2 includes a single-chip microcomputer U1 (PT1301), its enabling terminal ON/OFF is connected to the power supply terminal VDD, and connected to the negative pole of the voltage regulator tube D3 through a resistor R6, and the positive pole of the voltage regulator tube D3 passes through the inductor L1 It is connected with the positive pole of the USB input plug 1 and the positive pole of the battery 4, and the enable terminal ON/OFF receives the voltage input by the positive pole of the USB input plug 1. When the voltage is high, the single-chip microcomputer U1 starts to work, and when the voltage is low, the single-chip microcomputer U1 stops working. The power supply terminal VDD introduces the working power to the single-chip microcomputer U1; the driving output terminal EXIT of the single-chip microcomputer U1 is connected to the gate of the MOS transistor Q2 through the resistor R5, the drain of the MOS transistor Q2 is connected to the positive pole of the voltage regulator tube D3, and the voltage regulator tube D3 The negative pole is connected to the positive pole of the output plug 3, the source of the MOS transistor Q2 is grounded, and the drive output terminal EXIT of the single-chip microcomputer U1 outputs a large current to be added to the load resistor to increase the voltage of the positive pole of the output plug 3; the ground terminal of the single-chip microcomputer U1 GND ground.

Resistors R7 and R8 connected in series are connected to the positive pole of the output plug 3 and the negative pole of the output plug 3 . The feedback terminal FB of the microcontroller U1 is connected to the junction between the resistors R7 and R8.

In order to improve the stability of the boost circuit, one end of the inductor L1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is grounded to reduce the noise between the positive pole of the input USB input plug 1 and the ground GND; It is connected to one end of the capacitor C2, and the other end of the capacitor C2 is grounded to reduce the noise between the power supply output terminal VDD and the ground terminal GND.

Claims (4)

1. A multifunctional USB charger is characterized in that: it includes a USB input plug (1), which can be connected with an external device to receive the power of the external device; a boost circuit (2), which is connected to the USB The input plug (1) is connected to convert the received low power into high power output; the output plug (3) is connected to the boost circuit (2), and the high power output by the boost circuit (2) is output to an external device Charge; A battery (4) is also connected between the USB input plug (1) and the boost circuit (2), and the battery (4) can receive the power of an external device through the USB input plug (1), and can also The voltage circuit (2) and the output plug (3) charge the external equipment. 2. A multifunctional USB charger according to claim 1, characterized in that: the USB input plug (1) can be connected to a power adapter with a USB socket, and the power adapter is connected to an external AC power supply. 3. A multifunctional USB charger according to claim 1 or 2, characterized in that: it also includes a display circuit (5) capable of displaying the working state, which is compatible with the USB input plug (1) and the boost circuit ( 2) connect. 4. A multifunctional USB charger according to claim 1, characterized in that: the boost circuit (2) includes a single-chip microcomputer (U1), and its enabling terminal (ON/OFF) is connected to the USB input plug (1 ), the drive output terminal (EXIT) of the microcontroller (U1) is connected to the gate of the MOS transistor (Q2) through the resistor (R5), and the drain of the MOS transistor (Q2) is connected to the positive electrode of the voltage regulator transistor (D3) , the negative pole of the regulator tube (D3) is connected to the positive pole of the output plug (3), the source of the MOS tube (Q2) is grounded, and the feedback terminal (FB) is connected between the positive and negative poles of the output plug (3).

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