CN102915098B - Electronic systems and connections for charging - Google Patents

Abstract

The invention provides an electronic system suitable for charging, which comprises a host, a universal serial bus connector, a charging connecting wire, a connector and a mobile device. The charging connection line is coupled to a host through a universal serial bus connector, obtains input voltage and input current from the host, and obtains maximum input power according to the voltage value and the current value of the input current if the voltage value of the input voltage is detected to be reduced by a preset ratio. The mobile device is coupled to the charging connection line through the connector, is charged by the host, and selects a charging state according to the maximum input power. The control circuit of the charging connecting line can automatically judge the maximum input power provided by the host and accordingly provide different output voltages, so that the mobile device can be charged at the USB ports of various desktop computers and notebook computers through the control circuit, the dependence of the mobile device (particularly a tablet computer) on an external charger is reduced, and the convenience in use is improved.

Description

Electronic systems and connections for charging

technical field

The invention relates to an electronic system and a connection device, in particular to an electronic system and a connection device which can be used for charging.

Background technique

Most of today's tablet computers charge the system through an external charger (Adaptor to tablet DC jack), but many tablet computers do not have the function of direct charging through a Universal Serial Bus (USB, hereinafter referred to as USB) port. Therefore, when carrying it out and using it at home, it is very inconvenient to have one more external charger. Most users will plug the external charger into the socket and forget to unplug it, and even if the external charger is not used, it will still consume energy and cause power waste.

Contents of the invention

In order to solve the above problems, the present invention provides an electronic system and a connection device, which can be used to directly charge a tablet computer through a USB port of a desktop computer and a notebook computer, thereby reducing the inconvenience caused by using an external charger.

The present invention provides an electronic system suitable for charging, including: a host; a connection device, including: a universal serial bus connector coupled to the host; a charging connection line coupled to the aforementioned universal serial bus The connector includes a control circuit, the control circuit is used to obtain an input voltage and an input current from the above-mentioned host, and when a voltage value of the above-mentioned input voltage is detected to drop by a predetermined ratio, according to the above-mentioned voltage value and the above-mentioned input A current value of the current obtains a maximum input power; a connector; and a mobile device including: a socket coupled to the connector of the connection device; and a charging unit charged by the host, and according to the maximum The input power selects a state of charge.

In addition, the present invention provides a connection device suitable for charging, comprising: a universal serial bus connector for coupling to a host; a charging connection line coupled to the aforementioned universal serial bus connector and including a The control circuit, the control circuit is used to obtain an input voltage and an input current from the host computer, and when it detects that a voltage value of the input voltage drops by a predetermined ratio, it provides a current value according to the voltage value and the input current an output voltage; a connector for outputting the output voltage.

The control circuit of the charging connection line of the present invention can automatically judge the maximum input power that the host can provide, and provide different output voltages accordingly, so that the mobile device can be connected to various USB ports of various desktop computers and notebook computers via it. Charging reduces the dependence of mobile devices (especially tablet computers) on external chargers and increases the convenience of use.

Description of drawings

FIG. 1 is a schematic diagram showing an electronic system according to an embodiment of the present invention;

2 is a schematic diagram showing a connection device according to an embodiment of the present invention;

Fig. 3 is a diagram showing the relationship between the input voltage and the input current of the charging connection line according to an embodiment of the present invention;

FIG. 4 is a graph showing the relationship between the maximum input power, the output voltage and the state of charge according to an embodiment of the present invention.

Wherein, the reference signs are explained as follows:

100～electronic system; 102～host;

104～USB connector; 106～charging cable;

107～connector; 108～socket;

110～mobile device; 114～charging unit;

120～connecting device; 202～inductance;

204～transistor; 206～diode;

208～capacitor; 210～control circuit;

300～coordinate diagram; 400～relationship diagram;

A%, B%～established ratio; C1, C2～curve;

GND～ground node; I1, I2～critical current value;

Ii～input current; Io～output current;

N1, N2, N3, NO～node;

Vi～input voltage; Vo～output voltage;

Vp～initial voltage value;

Vp(1-A%)～critical voltage value;

Vr～normal output value;

Vr(1-B%)～lower limit output value;

Vr(1+B%)～upper limit output value;

W1, W2～power value.

Detailed ways

FIG. 1 is a schematic diagram showing an electronic system 100 according to an embodiment of the invention. As shown in FIG. 1 , the electronic system 100 is suitable for charging, and may include a host (computer) 102 , a USB connector (USB connector) 104 , a charging cable (charging cable) 106 , a connector 107 , and a mobile device 110 . Wherein, the USB connector 104 , the charging connection cable 106 , and the connector 107 are collectively referred to as the connecting device 120 . The host computer 102 can be a desktop computer or a notebook computer. The mobile device 110 can be a tablet PC (tablet PC) or a smart phone, and includes a socket 108 and a charging unit 114 . The charging cable 106 can be coupled to the host 102 via the USB connector 104 , and the mobile device 110 can be coupled to the connector 107 via the socket 108 , and the charging unit 114 can be charged via the host 102 . The connector 107 can be a USB connector, a mini USB (Micro USB) connector, or other types of connectors.

FIG. 2 is a schematic diagram showing a connecting device 120 according to an embodiment of the present invention. As shown in FIG. 2 , the charging cable 106 of the connecting device 120 can obtain the input voltage Vi and the input current Ii from the host 102 via the USB connector 104, and output the output voltage Vo and the output current Io to the mobile device 110 via the connector 107. . The charging connection line 106 may include: an inductor 202 , a transistor 204 , a diode 206 , a capacitor 208 , and a control circuit 210 . The inductor 202 is coupled between the nodes N1 and N3; the transistor 204 is coupled between the node N3 and the ground node GND, and includes a gate coupled to the control circuit 210; the diode 206 is coupled between the nodes N3 and NO; And the capacitor 208 is coupled between the node NO and the ground node GND. The control circuit 210 can measure the potential difference between the nodes N1 and N2 to obtain the input voltage Vi, and can also measure the current of the node N1 or N3 to obtain the input current Ii. In addition, the control circuit 210 can adjust the gate voltage of the transistor 204 according to the maximum input power (the maximum input power can be calculated according to the input voltage Vi and the input current Vo, which will be described in detail in the following embodiments) to determine the output voltage Vo And the output current Io to select the appropriate output power. In addition, the control circuit 210 can also adjust the input current obtained from the host 102 .

Generally speaking, the host computer 102 (such as a desktop computer and a notebook computer) can usually provide a DC input voltage Vi of about 5V through the USB port, but the input current Ii varies due to different brand specifications. The maximum input power that can be provided varies. The control circuit 210 of the charging connection line 106 of the present invention can automatically determine the maximum input power that the host 102 can provide, and then determine the appropriate output voltage Vo and output current Io according to the maximum input power to charge the mobile device 110 .

FIG. 3 is a graph 300 showing the relationship between the input voltage Vi and the input current Ii of the charging connection line 106 according to an embodiment of the invention. At the beginning, the voltage value (magnitude of the input voltage) of the input voltage Vi obtained by the control circuit 210 of the charging connection line 106 from the host 102 is an initial voltage value Vp (for example: 5V). In order to test the maximum input power of the host 102, the magnitude of the input current Vi obtained by the control circuit 210 of the charging connection line 106 from the host 102 will gradually increase. During this process, if the host 102 has provided the maximum input power, the voltage value of the input voltage Vi will start to drop. When the control circuit 210 of the charging connection line 106 detects that the voltage value drops by a predetermined ratio A%, it can obtain the maximum input power according to the current voltage value and current value. For example, if the relationship between the input voltage Vi and the input current Ii is as shown in the curve C1, when the control circuit 210 of the charging connection line 106 detects that the voltage value of the input voltage Vi drops by a predetermined ratio A% from the initial voltage value Vp, it becomes When it is the critical voltage value Vp(1-A%) (for example: 5V-5V*5%=4.75V), it is calculated according to the critical voltage value Vp(1-A%) and the corresponding critical current value I1 at this time The maximum input power (for example: the product of the critical voltage value Vp (1-A%) and the corresponding critical current value I1 ). Similarly, if the relationship between the input voltage Vi and the input current Ii is as shown in the curve C2, the control circuit 210 of the charging connection line 106 can calculate the maximum Input power (for example: the product of the critical voltage value Vp (1-A%) and the corresponding critical current value I2 ). The predetermined ratio A% may be 2%, 3%, 4%, 5%, 6% and so on. After obtaining the maximum input power, the control circuit 210 of the charging connection line 106 can determine the output voltage Vo provided to the mobile device 110 according to the maximum input power, so that the charging unit 114 of the mobile device 110 can judge the maximum output power of the host 102 according to the output voltage Vo.

FIG. 4 is a graph 400 showing the relationship between the maximum input power, the output voltage Vo and the state of charge according to an embodiment of the present invention. As shown in FIG. 4 , the charging unit 114 of the mobile device 110 can select the charging state according to the maximum output power, and the charging connection line 106 can select the output voltage Vo according to the maximum output power. For example, the control circuit 210 of the charging connection line 106 can compare the maximum output power with the power values W1, W2, wherein the power value W2 is greater than W1. When the maximum output power is between the power values W1 and W2, the voltage value of the output voltage Vo of the charging connection line 106 is the normal output value Vr (for example: 12V), and the charging state of the charging unit 114 of the mobile device 110 is slow. Fast charging; when the maximum output power is less than the power value W1, the voltage value of the output voltage Vo of the charging connection line 106 is the normal output value Vr, which drops by a predetermined ratio B%, that is, the lower limit output value Vr (1-B%) (for example: 12V -12V*5%=11.4V), and the charging state of the charging unit 114 of the mobile device 110 is not charging, and only works normally; when the maximum output power is greater than the power value W2, the voltage of the output voltage Vo of the charging connection line 106 The normal output value Vr rises by a predetermined ratio B%, that is, the upper limit output value Vr (1+B%) (for example: 12V+12V*5%=12.6V), and the charging state of the charging unit 114 of the mobile device 110 is fast Charge. The predetermined ratio B% may be 2%, 3%, 4%, 5%, 6% and so on. It should be noted that the description of the output voltage Vo and the charging state in FIG. 4 is only an example, and is not intended to limit the present invention.

The control circuit 210 of the charging connection line 106 in the present invention can automatically determine the maximum input power that the host 102 can provide, and provide different output voltages Vo accordingly, so that the mobile device 110 can use it on various desktop computers, The USB port of the notebook computer is used for charging, which reduces the dependence of the mobile device 110 (especially the tablet computer) on an external charger and increases the convenience of use.

Although the present invention is disclosed above with preferred embodiments, it is not intended to limit the scope of the present invention. Anyone skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the scope defined by the appended claims.

Claims (6)

1. an electronic system, is applicable to charging, comprises:

One main frame;

One coupling arrangement, comprising:

One first universal serial bus connector, is couple to above-mentioned main frame;

One charging connection wire, be couple to above-mentioned universal serial bus connector, and include a control circuit, above-mentioned control circuit is in order to obtain an input voltage and an input current from above-mentioned main frame, and in detect above-mentioned input voltage one magnitude of voltage decline one both fixed-ratio time, the current value according to above-mentioned magnitude of voltage and above-mentioned input current obtains a maximal input;

A connector; And

One mobile device, comprising:

One socket, is couple to the above-mentioned connector of above-mentioned coupling arrangement; And

One charhing unit, is charged by above-mentioned main frame, and selects a charged state according to above-mentioned maximal input;

Wherein above-mentioned both fixed-ratios are 2 percent, 3 percent, 4 percent, or 6 percent.

2. electronic system as claimed in claim 1, wherein when the above-mentioned control circuit of above-mentioned charging connection wire obtains above-mentioned input current from above-mentioned main frame, above-mentioned current value becomes large gradually.

3. electronic system as claimed in claim 1, wherein the above-mentioned control circuit of above-mentioned charging connection wire is more according to above-mentioned maximal input, determine the output voltage being supplied to above-mentioned mobile device, and the above-mentioned charhing unit of above-mentioned mobile device selects above-mentioned charged state according to above-mentioned output voltage.

4. electronic system as claimed in claim 1, wherein when above-mentioned maximal input is less than first performance number, above-mentioned charged state is not for charge; When above-mentioned maximal input is between above-mentioned first performance number and one second performance number, above-mentioned charged state is for charge at a slow speed; And when above-mentioned maximal input is greater than above-mentioned second performance number, above-mentioned charged state is rapid charge, wherein above-mentioned second performance number is greater than above-mentioned first performance number.

5. a coupling arrangement, is applicable to charging, comprises:

One universal serial bus connector, in order to couple a main frame;

One charging connection wire, be couple to above-mentioned universal serial bus connector, and include a control circuit, above-mentioned control circuit is in order to obtain an input voltage and an input current from above-mentioned main frame, and in detect above-mentioned input voltage one magnitude of voltage decline one both fixed-ratio time, the current value according to above-mentioned magnitude of voltage and above-mentioned input current provides an output voltage;

A connector, in order to export above-mentioned output voltage;

Wherein above-mentioned both fixed-ratios are 2 percent, 3 percent, 4 percent, or 6 percent.

6. coupling arrangement as claimed in claim 5, wherein when the above-mentioned control circuit of above-mentioned charging connection wire obtains above-mentioned input current from above-mentioned main frame, above-mentioned current value becomes large gradually.