CN201113475Y - USB charger with control switch - Google Patents

Abstract

The utility model discloses a USB charger with a control switch, and its technical key points are: comprising a USB plug, a boost circuit, a battery connected to the boost circuit, and a control switch connected to the USB plug, the boost circuit, and the battery, the control switch is a two-gear switch, the first gear controls an external power supply to charge the battery, and the second gear controls the battery voltage to charge an external device through a USB plug after being boosted by the boost circuit. When in use, the USB plug is directly plugged into the USB socket on the external power supply, and then the single toggle contact SPDT is connected to the first gear S1, so that the external power supply can be conveniently charged to the battery; when the mobile phone is out of power, the USB plug is plugged into the external device socket and switched to the SW gear to charge the mobile phone, so as to play an emergency role.

Description

A USB charger with a control switch

[technical field]

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

[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 USB charger with a control switch which has a simple circuit structure and can charge a mobile phone in an emergency.

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

The utility model relates to a USB charger with a control switch, which is characterized in that it includes a USB plug, a boost circuit, a battery connected to the boost circuit, and a battery connected to the USB plug, the boost circuit, and the battery. Control switch, the control switch is a switch with two gears, the first gear controls the external power supply to charge the battery, and the second gear controls the voltage of the battery to charge the external device through the USB plug after the voltage of the battery is boosted by the booster circuit.

A USB charger with a control switch as described above is characterized in that it also includes a display circuit capable of displaying the working status, one end of which is connected to the positive pole of the battery, and the other end is connected to the first gear of the control switch.

A USB charger with a control switch 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 battery, 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 second gear of the control switch, and the source of the MOS tube is grounded.

The beneficial effects of the utility model are:

1. Insert the USB plug directly into the USB socket on the external power supply, and then connect the single-toggle contact SPDT to the first gear S1, so that the external power supply can be conveniently charged for the battery; when the mobile phone is out of power, the The USB plug is inserted into the external device socket and turned to the SW gear to charge the mobile phone, so as to play an emergency role.

2. 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 USB charger with a control switch includes a USB plug 1, a boost circuit 2, a battery 3 connected to the boost circuit 2, and a USB plug 1, a boost circuit 2, and a battery 3 Both connected control switches 4, when the USB plug 1 is connected to an external power supply, it is used to receive the external power supply to charge the battery 3; when the USB plug 1 is connected to an external device, the voltage of the battery 3 is boosted by a booster circuit 2 Finally, the external device (like a mobile phone) is charged through the USB plug 1 .

The utility model also includes a control switch 4 and a display circuit 5. The control switch 4 is a switch with two gears. The control switch 4 includes a first gear S1, a second gear SW, and the two gears. The single toggle contact SPDT that can be connected to the first gear, the single toggle contact SPDT is connected to the positive pole of the USB plug 1, the single toggle contact SPDT is connected to the first gear S1, and the external power supply is controlled to charge the battery 3, The single toggle contact SPDT is connected with the second gear SW to control the battery 3 to charge the external device. The display circuit 5 can display the working status, one end of which is connected to the positive pole of the battery 3, and the other end is connected to the first gear position S1 of the control switch 4. When the single toggle contact SPDT is connected to the first gear position S1, the display circuit 5 will emit light, indicating that the external power supply is charging the battery 3 .

Figure 2 is a schematic circuit diagram of a technical solution of the present utility model. In this solution, the booster circuit 2 includes a single-chip microcomputer U1 (PT1301), and its enabling terminal CE and power supply terminal VDD are connected together, and are all connected to each other through a resistor R1. The negative pole of the voltage regulator D3 and the positive pole of the voltage regulator D3 are connected to the positive pole of the battery 4 through the inductor L1, and the enabling terminal CE receives the voltage input from the outside world. When the single toggle contact SPDT hits the SW terminal, the battery 4 is enabled. Terminal CE inputs a high voltage to start the single-chip microcomputer U1 to start working. When the single-toggle contact SPDT hits the S1 terminal, the outside world inputs a low voltage to the enabling terminal CE, and the single-chip microcomputer U1 stops working. The power supply terminal VDD introduces voltage from the positive pole of the battery 4 to provide the working voltage for the single-chip microcomputer U1. The drive output terminal EXT of the microcontroller U1 is connected to the gate of the MOS transistor Q1 through the resistor R7, the drain of the MOS transistor Q1 is connected to the positive pole of the regulator tube D1, and the negative pole of the regulator tube D1 is connected to the second block of the control switch 4 On the bit SW, the source of the MOS transistor Q1 is grounded; the drive output terminal EXT of the single-chip microcomputer U1 outputs a large current and adds it to the load resistor to increase the voltage output by the positive pole of the USB plug 1; the ground terminal GND of the single-chip microcomputer U1 is grounded. The feedback terminal FB of the microcontroller U1 is connected to one end of the resistors R2 and R3, the other end of the resistor R2 is connected to the second gear SW of the control switch 4, and the other end of the resistor R3 is connected to the negative pole of the USB plug 1.

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 battery 4 and the ground terminal GND; the power supply terminal VDD is connected to the capacitor C5 One end, the other end of the capacitor C5 is grounded to reduce noise between the power supply terminal VDD and the ground terminal GND.

Claims (3)

1. USB charger with control switch, it is characterized in that: the control switch (4) that includes USB plug (1), booster circuit (2), the battery (3) that is connected with booster circuit (2) and all be connected with USB plug (1), booster circuit (2), battery (3), this control switch (4) is the switch of two gears, first gear control external power supply is battery (3) charging, and the voltage of second gear control battery (3) is charging external equipment by USB plug (1) after boosting through booster circuit (2).

2. a kind of USB charger according to claim 1 with control switch, it is characterized in that: also include can display working condition display circuit (5), the one end is connected with the positive pole of battery (3), and the other end is connected with first gear of control switch (4) (S1).

3. a kind of USB charger according to claim 1 and 2 with control switch, it is characterized in that: described booster circuit (2) comprises single-chip microcomputer (UI), its Enable Pin (CE) is connected with the positive pole of battery (3), the drive output (EXT) of single-chip microcomputer (UI) is connected on the grid of metal-oxide-semiconductor (Q1) by resistance (R7), the drain electrode of metal-oxide-semiconductor (Q1) is connected on the positive pole of voltage-stabiliser tube (D1), the negative pole of voltage-stabiliser tube (D1) is connected on second gear (SW) of control switch (4), the source ground of metal-oxide-semiconductor (Q1).

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