CN2775860Y - USB port charger - Google Patents

Abstract

The USB port charger relates to a small household appliance, and is a battery charger that uses a computer USB port to provide power. Its structure includes a charger body composed of a computer USB port plug and a shell connected thereto, a wire with a small hollow plug, a charging circuit installed in the body, and a battery box, an AC adapter, and a car power adapter accessory. The utility model does not need to be equipped with a dedicated power conversion device, and is adapted to the social development situation that computers have been popularized in families and various rechargeable batteries are widely used. The rechargeable battery can be charged during the computer startup time. It is convenient to use, safe and reliable, small in size, light in weight, and low in cost. It adopts constant current charging, can be selected in multiple gears, has a reasonable structure, and can automatically detect and reduce the charging current after being fully charged. The battery box can adapt to various types of rechargeable batteries and is suitable for use with various power sources, and has considerable promotion value.

Description

USB port charger

technical field

The utility model relates to the field of household electrical appliances, in particular to a charger which utilizes a USB port of a computer to provide power to charge a rechargeable battery.

Background technique

The chargers of rechargeable batteries generally use 220V AC as the power source, and transform the high-voltage AC mains power into low-voltage power through transformer conversion or switching power supply, and then charge the rechargeable battery through circuit processing. This is a traditional practice. This structure and design need to be equipped with high and low voltage conversion devices. Undoubtedly, the manufacturing cost will increase, the volume and weight will also increase, and it will also occupy a power socket. Since it is directly drawn from the mains 220 volts, it is safe to use. It must also be considered and preventive measures must be taken.

Contents of the invention

The purpose of this utility model is to provide a charger using the USB interface of the computer as the power supply, which can charge the rechargeable battery while the computer is working, and does not need to be equipped with a special high and low voltage conversion device, which reduces the volume, weight and Low cost, safe, reliable, and easy to use. At the same time, the charger can automatically reduce the charging current after the battery is fully charged, and there will be no bursting. In addition, the proposal of the utility model has adapted to the needs of social development: because computers have been gradually popularized in families, and various forms of rechargeable batteries are widely used again, when using the time on the computer, insert the plug of the utility model into the USB port, and the utility model can be used at any time. There is no need to unplug the charger after charging, so it is very convenient to use. The utility model has a model with only a small hollow plug dedicated to charging the dual-purpose lamp of the hand-held radio lamp and the eye-protecting convenient lamp for delaying the shutdown, and also has a model with a battery box to meet various needs. Of course, it is best to supply the computer together as an accessory, and the battery holder of the battery box is designed to be of a variety of general-purpose structures.

The utility model is realized with following technical scheme:

The charger is shown in Figure 1 and Figure 2, and basically consists of three parts: ① charger main body; ② miniature control circuit board installed in the main body; ③ battery box for charging. Wherein, the charger main body includes a computer USB port plug 1, a cuboid shell 2 connected therewith and a connecting wire with a small hollow plug 6; the circuit schematic diagram of the control circuit board is shown in Fig. 2 In the figure, Z1 is the computer USB port plug, that is, the USB port plug 1 on the main body of the charger, the capacitor C1 and the diode D1 are the input rectification filter circuit, the resistor R1 and the diodes D2 and D3 form a voltage stabilizing circuit, and the light emitting diode D2 It also serves as a charging indicator light, that is, the indicator light 3 on the main body of the charger, resistors R2, R3, R4 and switch K1 form a charging current selection circuit. The charging current in this design is divided into three levels: 60, 120, and 180mA. It is the selection switch 5 on the main body of the charger. The triode V1 and the resistor R6 cooperate with the aforementioned components to form a constant current charging circuit. E1 is the battery to be charged. The triode V2 and R5 form a shunt control circuit after the battery is fully charged. The triode V3 and the resistor R7, diodes D4, D5, D6 and switch K2 form a fully charged detection circuit for the battery. K2 is 4 in Figure 1. According to whether the charged battery is a single cell or 2 cells in series, it is respectively placed in the on or off position. T1, T2 is the two terminals of the charging plug, i.e. the small plug 6 in Fig. 1; the battery case 15, as shown in Fig. 7 and Fig. 8, among the figures, 16 is the socket, 17 is the battery to be charged, T7, T8 is the socket contact, namely the 16 socket in Fig. 7, R8, R9, R10 are current sharing resistors, and E2, E3, E4 are batteries to be charged, namely the battery 17 in Fig. 7 . The battery is put into the battery box, and the small plug 6 of the charger is inserted in the battery box socket 16 to charge.

The working mode of the control circuit is: the low-voltage direct current from the USB interface Z1 is supplied to the rechargeable battery E1 to charge the battery, and the other circuit is stabilized by the voltage stabilizing circuit to form a charging current selection circuit and a constant current control circuit to control charging. The size of the current, after fully charged, the incoming call is shunted by the shunt circuit, which automatically reduces the charging current of the battery and protects the battery.

In order to make the charger more widely applicable, it is also equipped with the following two building block-style optional accessories:

1. AC power adapter, as shown in Figure 3 and Figure 4. In Figure 3, 7 is the AC adapter shell, 8 and 9 are the AC power plugs that can be rotated by 45°, that is, the T3 and T4 terminals in Figure 4, and 10 is the USB socket. In Figure 4, T3 and T4 are the AC power input terminals , FU1 is a fuse, B1 is a transformer, and Z2 is a USB socket, namely 10 in Figure 3. Insert the USB plug 1 in FIG. 1 into the USB socket 10 in FIG. 3 , and insert the plugs 8 and 9 of the adapter into the AC power socket, that is, the battery can be charged with AC power.

2. Car cigarette lighter socket adapter, as shown in Figure 5 and Figure 6. In Fig. 5, 11 and 12 are the positive and negative DC input terminals of the automobile cigarette lighter plug, namely T5 and T6 terminals in Fig. 6, 13 is the plug shell, and 14 is a USB socket. In FIG. 6 , T5 and T6 are DC input terminals, D7 is a diode, D8 is a Zener diode, and Z3 is a USB socket, which is 14 in FIG. 5 . Insert the USB plug 1 of the charger in FIG. 1 into the USB socket 14 in FIG. 5, and then insert the plugs 11 and 12 of the adapter into the car cigarette lighter socket, and the battery can be charged with the car power supply.

The utility model has the following characteristics in design:

1. Use the USB port of the computer to provide power for the charger, and charge the rechargeable battery while the computer is working, without the need for high and low voltage conversion devices. It is easy to use, safe and reliable, small in size and light in weight.

2. Assemble the charger circuit board and the USB plug into one, no need for a separate shell.

3. When in use, insert the charger into the USB port of the computer, insert the small plug on the connection line into the socket on the optional battery box or the charging socket of the delay eye protection lamp, and the battery can be charged when the computer is working. Charging, the charger does not need to be unplugged after charging.

4. The charger adopts constant current charging, and 3 levels of charging current can be selected.

5. After the battery is fully charged, the charger will automatically detect and reduce the charging current.

6. The design structure is simple and reasonable, and the electronic components adopt mass-produced cheap general-purpose devices, and the production cost is low.

7. Comes with an adapter, which can be used for AC mains and car cigarette lighter power supply for charging.

Description of drawings

Figure 1 is the outline structure diagram of the charger; Figure 2 is the schematic diagram of the charger circuit;

Fig. 3 is a schematic diagram of an AC power adapter; Fig. 4 is a circuit diagram of an AC power adapter;

Figure 5 is a schematic diagram of an adapter for a car cigarette lighter socket; Figure 6 is a circuit diagram of the adapter.

Figure 7 is a schematic diagram of the battery box; Figure 8 is a circuit diagram of the battery.

Detailed ways

The manufacturing process of the utility model charger is not complicated, and with reference to accompanying drawing 1, installs as follows:

The cuboid shell 2 of the charger main body is divided into two parts, the panel seat and the back cover, which can be injection molded by plastic or made of metal, and there are notches, holes and indicator lights for the selection switches 5 and 4 on the panel seat The hole is equipped with a printed circuit board formed by the circuit schematic diagram in Fig. 2 inside, and all electronic components are welded and installed on the printed circuit board, including resistance-capacitance elements R and C, semiconductor diode D and triode V, which are composed of wires and USB plug Z1 (1), selector switch K1 (5), K2 (4) and is connected with small hollow plug 6. Put the printed circuit board into the card slot of the shell base, the indicator light D2 corresponds to the reserved hole (3), and the toggle button of the selection switch K1 is exposed at the corresponding notch, and the knob of the switch K2 is exposed at the reserved hole. position, fasten the back cover, screw on the fixing screws, and the assembly is complete.

The outer surface decoration of the charger of the utility model can adopt various surface decoration techniques such as primary color, finishing, wire drawing, electroplating or color printing, so as to achieve the purpose of harmony, beauty and fashion. There is no insulation requirement for the shell material, just practical.

The production of the AC adapter is the same as that of the commercially available small rectifier power supply, and the components are loaded according to the circuit schematic diagram. The USB socket 10 is required, and the plug contacts 8 and 9 can be rotated by 45°; the car cigarette lighter socket adapter uses the finished plug As the positive pole 11, the negative pole 12 and the housing 13, a USB socket 14 is made and installed at the tail of the housing 13; the battery box can be of various types, and the battery holder slots are mainly connected in parallel, supplemented by series connection.

When using, first turn the knob of the switch 4 to point to the corresponding single or double-cell mark according to whether the battery to be charged is single-cell or double-cell in series; then according to the size of the battery to be charged, turn the charging current selection switch 5 to select If you have a suitable charging current, insert the USB plug 1 of the charger into the USB port of the computer, and you can charge the battery by the way when the computer is working, or plug it into the USB socket on an adapter, and charge according to local conditions. During the charging process, the green power indicator light is on, indicating that it is charging.

The utility model has the characteristics of flexibility, convenience and wide application range.

Claims (5)

1. A "USB port charger" for charging is a battery charger that uses the computer's USB port to provide power. An integrated cuboid shell and connecting wires with small hollow plugs; ② Micro control circuit board installed in the cuboid shell; ③ Battery box for storing rechargeable batteries. 2. The USB port charger according to claim 1, characterized in that: the micro-control circuit board is assembled from resistance-capacitance elements, semiconductor tubes, and charging current selection switches, and specifically contains: composed of R1, D2, and D3 The voltage stabilizing circuit, the charging current selection circuit composed of R2, R3, R4 and K1, the constant current charging circuit composed of V1, R6 and the aforementioned components, the shunt control circuit composed of V2 and R5 after the battery is fully charged and composed of The battery charging detection circuit composed of V3, R7, D4, D5, D6, and K2. 3. The charger with USB port according to claim 1 or 2, characterized in that: there are control switch notches and indicator light holes on the main shell of the charger, which correspond to K, D2 and D5 on the control circuit board. 4. The charger with USB port according to claim 1 or 2, characterized in that: it is also equipped with an AC power adapter, the power plug in which can be rotated by 45°, and the output port is a USB socket. 5. The charger with USB port according to claim 1 or 2, characterized in that: it is also equipped with a car cigarette lighter socket adapter, which is improved by using the current cigarette lighter, and the output port is a USB socket.

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