CN201947030U - Emergent charge device of a mobile terminal - Google Patents

Abstract

The utility model discloses an emergent charge device for mobile terminals including: a mobile terminal to be charged, a charge wire and a charge mobile terminal having a test circuit to test if the charge wire is plugged and charging the mobile terminal to be tested. When charging, both ends of the charge wire are connected with the charge ports of the charge mobile terminal and the mobile terminal to be charged. The utility model can realize that the in case of emergency is the portable terminal and charges, satisfies user's demand.

Description

An emergency charging device for a mobile terminal

technical field

The utility model relates to a mobile terminal charging technology, in particular to an emergency charging device for a mobile terminal.

Background technique

With the rapid development of mobile communication technology, mobile terminals are playing an increasingly important role in people's lives, and the functions of mobile terminals are becoming more and more powerful. Correspondingly, the power consumption of mobile terminals is also increasing. The requirements for its battery capacity are also getting higher and higher. Therefore, while enjoying the convenience brought by multiple functions of the mobile terminal, people are also troubled by the problem of short battery standby time. When the battery power of the mobile terminal is exhausted or insufficient, the user will not be able to get in touch with others, especially when the user is in an emergency and cannot find a power source to charge the mobile terminal because the user is outdoors, the battery power of the mobile terminal The inconvenience caused by exhaustion or shortage to people's work and life is more prominent.

Utility model content

In view of this, the main purpose of the present utility model is to provide an emergency charging device for a mobile terminal, which can charge the mobile terminal in an emergency and meet the needs of users.

In order to achieve the above object, the technical solution of the utility model is achieved in that:

The utility model provides an emergency charging device for a mobile terminal, which includes a mobile terminal to be charged; the device also includes a charging cable and a charging mobile for charging the mobile terminal to be charged, which is provided with a detection circuit inside to detect whether the charging cable is inserted. terminal;

When charging, the charging cable is respectively connected to the charging ports of the charging mobile terminal and the charging mobile terminal through the ports at both ends.

Wherein, the ports at both ends of the charging cable are of the same type, or of two different types.

Wherein, the charging cable port type includes but not limited to Min-Universal Serial Bus USB and Micro-USB.

In the above solution, the detection circuit is arranged between the charging pin CHARGE and the positive pole VBAT of the battery.

Wherein, the detection circuit is composed of an analog switch and a pull-up resistor.

Wherein, the detection circuit is composed of a MOS transistor and a pull-up resistor.

Wherein, the charging cable is also provided with a boost circuit for adjusting the output voltage of the charging mobile terminal to a standard charging voltage.

Wherein, the boost circuit is composed of a VBAT module, an energy storage inductor, a rectification and filtering module, a control circuit, a power switch and a voltage output module.

Wherein, an indicator light is also provided on the outer shell of the booster circuit.

The mobile terminal emergency charging device provided by the utility model is composed of a charging cable and a charging mobile terminal with a detection circuit inside; when the charging mobile terminal detects that the charging cable is inserted, it charges the mobile terminal to be charged through the charging cable; The charging cable provides a path for the charging mobile terminal to charge the mobile terminal to be charged. In actual application, the utility model can use the voltage difference between the two mobile terminal batteries to charge the mobile terminal to be charged, so as to realize the purpose of charging the mobile terminal in an emergency and meet the needs of users; the charging line described in the utility model The cable is small and easy to carry.

In addition, the utility model is also provided with a boost circuit on the charging cable, after adjusting the output voltage of the charging mobile terminal to a standard voltage, it charges the mobile terminal to be charged, so the charging efficiency can be improved, and the user experience is better.

Description of drawings

Figure 1 is a schematic diagram of the external structure of the charging cable of the present invention;

Fig. 2 (a) is the detection circuit structure schematic diagram that the utility model is made up of analog switch and pull-up resistor;

(b) is the detection circuit structure schematic diagram that the utility model is made up of MOS tube and pull-up resistor;

Fig. 3 is a schematic diagram of the external structure of the charging cable provided with the boost circuit in the present invention;

FIG. 4 is a schematic diagram of the internal structure of an embodiment of the booster circuit of the present invention.

Detailed ways

The utility model proposes an implementation scheme for charging a mobile terminal with a charged battery for a mobile terminal with an exhausted battery. Hereinafter, the mobile terminal with a charged battery is called a charging mobile terminal, and the mobile terminal with an exhausted battery is called a charging mobile terminal. For the mobile terminal to be charged, the basic idea of the utility model is: set a charging cable, and set a detection circuit inside the charging mobile terminal; when the charging mobile terminal detects that the charging cable is inserted, the mobile terminal to be charged is charged Charge.

Wherein, the detection circuit can be implemented by a combination of an analog switch and a pull-up resistor, or by a combination of a MOS tube and a pull-up resistor; the detection circuit is set on the charging pin CHARGE of the charging port of the charging mobile terminal and the battery positive VBAT between.

Furthermore, the charging cable of the present invention is also provided with a boost circuit to achieve the purpose of quickly and efficiently charging the mobile terminal to be charged.

Below in conjunction with accompanying drawing and specific embodiment the utility model is described in further detail.

The ports at both ends of the charging cable of the present invention are of the same type, and may also be of two different types. The port types include but are not limited to Min-Universal Serial Bus (USB) and Micro-USB, so as to be different from mobile terminals Type of charging port to match. In actual application, the two ports of the charging cable are respectively inserted into the charging ports of the charging mobile terminal and the charging mobile terminal.

FIG. 1 is a schematic diagram of the external structure of the charging cable. The two ports are divided into an input port and an output port. The input port is connected to a charging mobile terminal, and the output port is connected to a mobile terminal to be charged. Wherein, a pin of the input port is grounded, for example: if the charging pin CHARGE is pin 1, then pin 2 can be set to be grounded; the output port is inserted into the port of the mobile terminal when charging with the existing charging cable same.

When setting the detection circuit, a detection circuit is set between the internal charging pin CHARGE of the charging mobile terminal and the battery positive VBAT, and the detection circuit is composed of an analog switch and a pull-up resistor; or, is composed of a MOS tube and a pull-up resistor.

In actual application, when the charging cable is inserted into the charging mobile terminal, the detection circuit installed inside the charging mobile terminal detects the charging cable, for example: the detection circuit is based on the currently inserted charging cable, such as the above-mentioned pin 2 Potential level is judged, if pin 2 is low potential, namely pin 2 is grounded, then determine that the charging cable that inserts at present is the charging cable of the utility model; The charging cable is not the charging cable described in the present invention, that is, the cable normally used for charging mobile terminals in the prior art.

When the charging mobile terminal determines that the inserted cable is the charging cable of the present invention, the path between the charging pin CHARGE and the battery positive VBAT is reversely connected through the analog switch or MOS tube, and the battery positive VBAT of the charging mobile terminal passes through the charging cable. Connect to the charging port of the mobile terminal to be charged, and use the voltage difference between the two batteries to charge the mobile terminal to be charged.

Here, the reverse connection is relative to the normal charging of the charging mobile terminal in the prior art. When charging the charging mobile terminal in the prior art, the path between the charging pin CHARGE and the positive pole VBAT of the battery is forward conducting. ; In the charging process of the utility model, the operation performed by the mobile terminal to be charged is the same as that of the prior art, that is, the internal circuit of the mobile terminal to be charged is not different from that of the prior art.

Further, a boost circuit can also be set on the charging cable of the present invention, and an existing DC-DC (DC-DC) boost circuit can be used. When the charging cable is inserted into the charging mobile terminal, the voltage sent by the charging mobile terminal The signal triggers the boost circuit to start working, and converts the voltage of the battery of the charging mobile terminal into a charging voltage, such as 5V, so as to quickly charge the mobile terminal to be charged.

Wherein, the charging voltage is the standard voltage required for charging the mobile terminal in the prior art, because the output voltage of charging the mobile terminal is generally lower than the charging voltage in practical application, in order to improve the charging efficiency, the utility model is added to the charging line A booster circuit is installed on the cable.

The mobile terminal emergency charging device provided by the utility model is composed of a mobile terminal to be charged, a charging cable, and a charging mobile terminal with a detection circuit inside to detect whether the charging cable is inserted and to charge the mobile terminal to be charged; when charging, The charging cable is respectively connected to the charging ports of the charging mobile terminal and the charging mobile terminal through ports at both ends.

Further, the charging cable is also provided with a boost circuit for adjusting the output voltage of the charging mobile terminal to a standard charging voltage.

Here, the port types of the charging cable include but are not limited to Min-USB and Micro-USB;

The detection circuit of the charging mobile terminal is arranged between the charging pin CHARGE and the positive pole VBAT of the battery, and the detection circuit is composed of an analog switch and a pull-up resistor; or, is composed of a MOS tube and a pull-up resistor.

Fig. 2 (a) is the detection circuit structure schematic diagram that the utility model is made up of analog switch and pull-up resistor, as shown in Fig. 2 (a), pull-up resistor R, the analog switch in the frame in the figure and the lead that is connected with it A detection circuit is formed, and the capacitors C1, C2, resistors R1, R2, and MOS tubes are components of the existing circuit. In Fig. 2 (a), the state of the current analog switch is that the charging cable of the utility model is not inserted in the charging mobile terminal, the input terminal B0 of the analog switch is connected to the positive pole VBAT of the battery, the input terminal B1 is suspended, and the selection terminal S is connected to 100KΩ Pull resistor R, the output terminal A is connected to the charging pin CHARGE, and the other side is connected to the input terminal B1. When a charging cable is plugged in, the working process of the charging mobile terminal detection circuit is as follows:

When the charging cable of the present invention is inserted, because the pin 2 of the charging cable is grounded, the selection terminal S is at a low potential, and at this time the output terminal A of the analog switch is automatically switched to the input terminal B0, so that the positive pole VBAT of the battery passes through The analog switch is connected to the charging pin CHARGE, reversely conducts the path between the charging pin CHARGE and the positive electrode VBAT of the battery, and the charging mobile terminal can charge the mobile terminal to be charged. At this time, the MOS tube is not turned on.

When charging the charging mobile terminal normally, insert the existing charging cable, because the voltage VDD comes from the main chip, so the selection terminal S is a high voltage, and the output terminal A of the analog switch is kept connected to the input terminal B1. At this time, the MOS tube In the conduction state, the path between the charging pin CHARGE and the battery positive VBAT is forward conducting. At this point, the charging mobile terminal can accept external normal charging, this part is the prior art, and the corresponding circuit structure, that is, the working principle, will not be described in detail.

Fig. 2 (b) is the detection circuit structure schematic diagram that the utility model is made up of MOS tube and pull-up resistor, as shown in Fig. 2 (b), pull-up resistor R, MOS tube 2 and the lead that is connected with it form detection circuit, The capacitors C1 and C2, the resistors R1 and R2, and the MOS transistor 1 are components of an existing circuit. Take the MOS transistor 2 as an N-channel MOS transistor as an example, the E terminal is connected to the positive pole VBAT of the battery, the B terminal is connected to a 100KΩ pull-up resistor R, and the C terminal is connected to the charging pin CHARGE.

The working principle of the detection circuit is similar to that of the detection circuit in Figure 2(a). When the charging cable of the present invention is not inserted, the B terminal of the N-channel MOS tube is at a high level, and the MOS tube 2 is not turned on. The reverse path between the pin CHARGE and the positive pole VBAT of the battery is not conducted. When the charging cable of the present invention is inserted, because the pin 2 of the charging cable is grounded, the potential of the B terminal of the N-channel MOS tube is pulled down, and the charging lead The reverse path between the pin CHARGE and the positive pole VBAT of the battery is turned on, and the charging mobile terminal can charge the mobile terminal to be charged.

Furthermore, the charging cable of the present invention is also provided with a boost circuit, and the existing DC-DC boost circuit can be used. Figure 3 is a schematic diagram of the external structure of the charging cable provided with the boost circuit in the present invention. The boost circuit is located inside the boost circuit shell, and an indicator light can be set on the boost circuit shell. When the charging cable shown is inserted into the charging mobile terminal and When the mobile terminal is waiting to be charged, the indicator light is on.

4 is a schematic diagram of the internal structure of an embodiment of the boost circuit, including a VBAT module, an energy storage inductor, a rectification and filtering module, a control circuit, a power switch and a voltage output module. The output voltage of the charging mobile terminal enters from the input port of the charging cable, and is output from the output port after being boosted to charge the mobile terminal to be charged. The function of each functional module in the boost circuit shown in FIG. 4 is the same as that of the prior art, and will not be described in detail here.

The above is only a preferred embodiment of the utility model, and is not used to limit the protection scope of the utility model. Any modification, equivalent replacement and improvement made within the spirit and principles of the utility model are all Should be included in the scope of protection of the present utility model.

Claims (9)

1. An emergency charging device for a mobile terminal, including a mobile terminal to be charged; it is characterized in that the device also includes a charging cable and a charging circuit that is provided with a detection circuit inside to detect whether the charging cable is inserted and charges the mobile terminal to be charged. mobile terminal; The charging cable is respectively connected to the charging ports of the charging mobile terminal and the charging mobile terminal through ports at both ends. 2. The mobile terminal emergency charging device according to claim 1, wherein the ports at both ends of the charging cable are of the same type or of two different types. 3. The mobile terminal emergency charging device according to claim 2, wherein the charging cable port types include Min-Universal Serial Bus USB and Micro-USB. 4. The mobile terminal emergency charging device according to claim 1, 2 or 3, characterized in that the detection circuit is arranged between the charging pin CHARGE and the positive pole VBAT of the battery. 5. The mobile terminal emergency charging device according to claim 1, 2 or 3, wherein the detection circuit is composed of an analog switch and a pull-up resistor R, and the pull-up resistor R is connected to the selection terminal S of the analog switch connected. 6. The mobile terminal emergency charging device according to claim 1, 2 or 3, wherein the detection circuit is composed of a MOS tube and a pull-up resistor R, and the pull-up resistor R is connected to the B terminal of the MOS tube . 7. The mobile terminal emergency charging device according to claim 1, 2 or 3, characterized in that the charging cable is further provided with a boost circuit for adjusting the output voltage of the charging mobile terminal to a standard charging voltage. 8. The mobile terminal emergency charging device according to claim 7, wherein the boost circuit is composed of a VBAT module, an energy storage inductor, a rectification filter module, a control circuit, a power switch and a voltage output module; Among them, the input terminal and output terminal of the energy storage inductor are respectively connected with the output terminal of the VBAT module and the input terminal of the rectification filter module, the output terminals of the energy storage inductor and the control circuit are connected with the power switch, and the input terminal of the control circuit is connected with the VBAT module It is connected with the output end of the rectification and filtering module, and the input end of the voltage output module is connected with the output end of the rectification and filtering module. 9 . The mobile terminal emergency charging device according to claim 7 , characterized in that, an indicator light is also provided on the outer shell of the booster circuit. 10 . the

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