KR20080040313A - Large power supplying device for usb device terminal - Google Patents

Abstract

A large power supplying device for a USB(Universal Serial Bus) terminal device is provided to prevent physical damage of a host due to overcurrent concentrated on a specific USB port of the host by uniformly distributing a current to USB connector ports connected to the host. A large power supplying device(20) for a USB(Universal Serial Bus) terminal device(30) includes a first USB connector housing, a first current control circuit, a second USB connector housing, a second current control circuit, a second USB cable, and a USB connector for the terminal device. The first USB connector housing is connected to a USB terminal of a host(10). The first current control circuit is included inside the first USB connector housing. The second USB connector housing is connected to the first USB connector with a first USB cable and has a USB connector connected to another USB terminal of the host. The second current control circuit is included inside the second USB connector housing. The second USB cable is connected to the first USB connector housing or the second USB connector housing. The USB connector for the terminal device is electrically connected to the host through the second USB cable and connected to a USB terminal of the USB terminal device.

Description

LARGE POWER SUPPLYING DEVICE FOR USB DEVICE TERMINAL}

1 is a view for explaining the basic concept of the configuration of the present invention.

2 is a view showing the circuit configuration of the current regulating device of an embodiment of the present invention.

3 is a diagram showing a circuit configuration of a current regulator of another embodiment of the present invention.

4 is a configuration diagram showing a schematic configuration of the present invention.

5 is a diagram illustrating various types of USB plugs applied to the present invention.

6 is a view showing a schematic configuration of a large current supply device according to a first embodiment of the present invention.

7 is a perspective view of an example of an actual product according to FIG. 6.

8 is a view showing a schematic configuration of a large current supply device according to a second embodiment of the present invention.

9 is a view showing a schematic configuration of a large current supply device according to a third embodiment of the present invention.

10 is a view showing a schematic configuration of a large current supply device according to a fourth embodiment of the present invention.

FIG. 11 is a graph showing the characteristics of one port of a USB hub in an embodiment of the present invention. FIG.

<Description of the symbols for the main parts of the drawings>

10: host

11, 12: host USB terminal

20: large current supply device

30: USB terminal device

31: USB terminal of the USB terminal device

41, 42: current regulation circuit

50, 51, 510: USB cable

201, 202, 203: USB connector for large current supply

200, 300, 00: USB connector housing with current control circuit

410, 420, 500: current control circuit housing

The accompanying drawings indicate that they are exemplified as a reference to enhance the understanding of the technical idea of the present invention, it is added that the scope of the present invention is not limited thereby.

<Technology field>

The present invention relates to a USB connector for supplying a current of a host to a USB terminal device by connecting the USB terminal device to the host using a universal serial bus (USB), and a connection structure thereof.

<Problems with Prior Art>

Universal Serial Bus (USB) ports installed on personal computers (PCs), laptops, etc. are a type of serial port that can be plug-and-play between peripheral computers such as keyboards, phones, modems, scanners, printers, etc., and the host computer. -Play) interface, and performs data communication and power supply with peripheral devices. Generally, two USB ports are installed in a computer, but a USB hub device can divide one port into multiple ports, so that up to 127 various peripheral devices can be connected. There are four contact lines in these USB ports, two of which are for data communication and the other two have power and ground functions.

That is, the USB terminal device can operate by receiving current from the host, and the maximum current that one port of the host can supply is limited to 500 mA. Therefore, devices using more than 500mA must have an external power supply.

Three methods are used to solve the current shortage problem of USB terminal devices using a current of 500mA or more.

The first is the most common and common method of using external power. However, the use of an external power supply not only raises the problem of cost increase, but also encounters a problem of increasing the volume of the entire device, and thus has a limitation that is difficult to use while moving.

The second method is to use its own auxiliary power (Battery). Since this method can no longer be used after consuming the energy stored in the battery, it is not suitable for a device that needs to be operated for a long time, and in addition, it must be provided with a means for recharging the battery, thereby increasing the cost.

Third, there is a way to get current from two or more hosts, but excessive current can be directed to a particular USB port on the host, causing physical damage to the host.

The present invention has been proposed to solve the above conventional problems.

An object of the present invention is to provide a device for supplying the current to the USB terminal device requiring a current of 500mA or more from a conventional USB host.

On the other hand, each port of the USB host has an internal power supply to safely supply up to 500mA of current at 5V, and each port operates independently and independently of the current supply of other ports. When current is required in USB terminal devices, if current is supplied from multiple ports at the same time, each port is independent, so theoretically, "500mA x number of ports" can be used. In order to receive this theoretical current, the current must be distributed equally to each port. In fact, when two USB ports are connected and supplied with current, for example, one port is 700 mA and the other is distributed at 100 mA, the USB port of the host may be damaged.

Accordingly, another object of the present invention is to provide a USB terminal device by evenly distributing the currents supplied from the USB host in supplying the current.

That is, the present invention is the above object, in the situation that the current of the host supplied from the standard USB port is limited to a maximum of 500mA, it is possible to stably supply the current of the host to the USB terminal device using the current of more than 500mA in the required size. To ensure that

It is still another object of the present invention to provide a control device for evenly distributing current, so that it can include all of the various types of USB connectors, while controlling various embodiments for evenly distributing the current supplied from the USB host. In providing a device.

In order to achieve the above object, a device capable of supplying a current of 500mA or more to the USB terminal device, comprising: a first USB connector housing connected to the USB terminal of the host; A first current control circuit embedded in the first USB connector housing; A second USB connector housing connected to the first USB connector housing by a first USB cable and having a USB connector connected to another USB terminal of the host; A second current control circuit embedded in the second USB connector housing; A second USB cable connected with the first USB connector housing or the second USB connector housing; And

And a USB connector for a terminal device electrically connected to the host through the second USB cable, and connected to a USB terminal of the USB terminal device, and capable of supplying a current of 500 mA or more to the USB terminal of the USB terminal device. It is done.

In addition, a device capable of supplying a current of 500mA or more to the USB terminal device,

A first USB connector connected to a USB terminal of the host; A second USB connector connected to another USB terminal of the host; A USB connector housing for the terminal device connected to the USB terminal of the USB terminal device; A first USB cable connecting the first USB connector and the USB connector housing for the terminal device; A second USB cable connecting the second USB connector to the USB connector housing for the terminal device; And

Built in the USB connector housing for the terminal device, the current of the host through the first USB cable and the current of the host through the second USB cable are equally controlled and 500mA to the USB terminal of the USB terminal device. It characterized in that it comprises a; current control circuit for supplying the above current.

In addition, a large current supply device for a USB terminal device of the present invention, a device capable of supplying a current of 500 mA or more to the USB terminal device, the first USB connector connected to the USB terminal of the host; A second USB connector connected to another USB terminal of the host; A current regulating circuit device that equally adjusts a current of a host introduced through a first USB cable connected with the first USB connector and a current of a host introduced through a second USB cable connected with the second USB connector; And

And a USB connector for a terminal device connected to the current control circuit device through a third USB cable and connected to the USB terminal of the USB terminal device. The terminal device may supply a current of 500 mA or more to the USB terminal of the terminal device. It is done.

In one embodiment of the present invention, the current control circuit device is preferably integrated into one housing or have a separate housing each.

In addition, in one embodiment of the present invention, it can be understood that the current regulation circuit adjusts the current using a series resistor.

In another embodiment of the present invention, it is preferable that the current regulation circuit adjusts the current by using a transistor having a series resistance and a switch function.

In addition, the current regulation circuit, it is preferable to limit the initial current using a capacitor.

In addition, the host of the present invention can be understood as any one of a computer, a notebook, a USB hub, the USB terminal device is preferably a USB modem.

In addition, the USB power line and the second USB connector of the first USB connector of the present invention is preferably bridged to each other.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured by those skilled in the art such as related well-known functions or well-known configurations, the detailed description thereof will be omitted. If the same reference numerals designate like elements, the same reference numerals are used.

1 illustrates an example of the basic concept of the present invention. The high current supply device 20 is connected to the USB terminal of the host 10 on the one hand via a USB cable and a USB connector, and on the other hand to the USB terminal of the USB terminal device 30.

AP1 (21), AP2 (22), AP3 (23) and AP4 (24) are USB connectors, and BP1 (11), BP2 (12), BP3 (13) and BP4 (14), which are USB terminals of the host 10. ) Are connected to each terminal. Each USB port provides up to 500mA of current from the USB host. The AP5 25 is a USB connector connected to the USB terminal CP of the USB terminal device 30, and may supply a current of 500 mA or more to the USB terminal device 30.

In FIG. 1, a plurality of USB connectors are included in the large current supply device 20, but only for the purpose of convenience of understanding the large current supply device 20, and the specific configuration and method of the large current supply device are described below. It will be described through the embodiment of.

 APR1 (41), APR2 (42), APR3 (43), and APR4 (44) are current regulation circuits for regulating current, which are used for balancing current and limiting over current. Component. Any number of (AP1, APR1), (AP2, APR2), (AP3, APR3) and (AP4, APR4) can be used, and the number is determined according to the amount of current required by the USB function device. .

In this way, the current control device 40 is provided separately, and the current control device 40 is connected to a plurality of USB terminals of the host to receive a current of up to 500 mA from the host, respectively, and at the same time, the current control circuit ( 40), after balancing the current between each USB port, it is possible to safely supply the current of more than 500mA to the USB terminal device (30). The current control circuit 40 distributes the current flowing through the host USB connectors 21, 22, 23, and 24 evenly, so that the current flows through the USB terminals respectively connected to the USB connectors. Excessive flow is limited and the host 10 can be prevented from being damaged by overcurrent.

Hereinafter, for convenience of description, a case in which two of (AP1, APR1) and (AP2, APR2) are used will be described as an example, and in the case where three or four are used, the same method may be extended.

2 and 3 are examples of the configuration inside APR1 and APR2, which are circuits for controlling the current in the large current supply device 20, and both APR1 and APR2 can use the same circuit and restrict excessive flow of current to the host. At the same time, it evenly distributes the current flowing to AP1 and AP2. 2 and 3 may modify the circuit within the scope not departing from the scope of the present invention according to the characteristics of the USB host, the present invention will be described only the basic example.

FIG. 2 is the most basic circuit to apply FIG. 1 to limit current distribution and excessive flow of current to the host. At voltages V1 and V2, currents I1 and I2 flow through V3 through series resistors R1 and R2. The voltages corresponding to V1 and V2 of the USB port supply 5V (typically within 0.25V). When the voltage difference between V1 and V2 (Vx = V2-V1) occurs at two ports of the USB host, the difference between the current difference between I1 and I2 (I1-I2) is as follows.

I3 = I1 + I2

I1 = (V1-V3) / R1, I2 = (V2-V3) / R2

If R1 and R2 have the same value of R,

I2-I1 = Vx / R

In other words, the current difference between the ports can be adjusted by the resistance value, so the appropriate resistance can be selected according to the required current value to obtain a similar current in both ports.

In FIG. 3, the series resistor R3 plays the same role as R1 and R2 in FIG. 2, transistor Q1 is used as the main switch to control I3, and transistor Q2 operates as a protection circuit for limiting excessive current. When a large amount of current I3 flows and the voltage Vgs2 across the resistor R3 increases, the transistor Q2 is turned on to turn off the Q1 to cut off the current. The load connected to the voltage V5 is generally a capacitive component, so the initial inrush current is very large. Capacitor C1 is used to limit this initial current.

The resistor R4 forms a path such that the capacitor C1 is discharged to the path of R4-R3-C1-R5 when the large current supply device 20 of FIG. 1 is separated from the host 10. Resistor R5 charges capacitor C1 through the path of R3-C1-R5 and turns on transistor Q1 by bringing voltage V7 to 0V in normal operation.

It is assumed that capacitor C1 is completely discharged in the initial state in which the circuit of FIG. 3 starts operation. Since capacitor C1 is completely discharged at the beginning, transistor Q1 is in an OFF state and only a current through R3-C1-R5 flows, so Vgs2 is a very small value, and transistor Q2 is also in an OFF state. As capacitor C1 charges, transistor Q1 slowly turns on and current I3 also gradually increases with load. In normal operation, transistor Q2 is turned OFF and transistor Q1 is turned ON to supply I3. However, when current I3 becomes large and transistor Q2 turns ON, transistor Q2 reduces Vgs1 of transistor Q1 to limit current I3.

4 shows the overall system configuration for connecting the USB terminal device 30 and the host 10 through the large current supply device 20 described above. The current control circuit is built into the USB connectors 201 and 202, and the host 10 uses the USB ports 11 and 12 of the USB HUB (it may use the USB port of a PC having two ports). The USB terminal device 30 used a USB modem.

The USB connector 201 includes a current control circuit APR1 (41), and the USB connector 202 includes a current control circuit APR2 (42). Four contacts are provided at a terminal of a USB connector 203 (corresponding to AP5 in FIG. 1) for a terminal device connected to a USB port (not shown, corresponding to CP in FIG. 1) of the USB modem of the large current supply device 20. Among them, P2 (White) and P3 (Green) are in charge of data communication, P1 (Red) is a Vcc contact to which power is supplied from the host, and P2 (Black) is ground. P1, P2, P3 and P4 contacts may also be understood as contacts of a female USB terminal on the side of a USB modem accommodating the USB connector 203 for the terminal device. These P1, P2, P3 and P4 contacts the USB connector. It is electrically connected to the current control circuit APR2 42 inside the connector to perform data communication.

However, in the current control circuit APR1 (41), the P2 contact and the P3 contact are not connected, only the P1 contact and the P2 contact are connected, and as shown in FIG. 4, the line 51 connected to the P1 contact of the USB connector 201 and Line 52 connected to the P4 contact is connected to line 53 connected to the P1 contact of the USB connector 202 and line 54 connected to the P4 contact, respectively. The power lines of both USB connectors are bridged to each other.

As a result, the USB terminal device (USB modem) is connected only to the first USB connector 201 having a current control circuit therein by a power line, and a second USB connector 202 having a current control device therein as well. The power line and the data line are both connected to each other, and the power lines of both USB connectors 202 are bridged with each other.

On the other hand, the USB connector is selected from the USB Series "A" connector, Series "B" connector, "Mini-A" and "Mini-B" connector as defined by the USB standard apparatus (http://www.usb.org). The scope of the present invention is not limited according to the type of the USB connector. 5 shows an example of a pin configuration of various USB plugs of the USB connector of the present invention. (a) shows the series "A", (b) shows the series "B", (c) shows the pin number of the series A and series B plugs and the signal name of the corresponding pin, and (d) shows the USB "Mini A", (e) shows the "Mini B" plug, and (f) shows the pin number and signal names of the "Mini A".

Four embodiments will now be described with regard to the configuration and location of the various high current supplies of the present invention. "APR1" and "APR2" refer to the current regulation circuit described with reference to FIGS. 2 and 3, respectively, but the present embodiments are composed of two current regulation circuits. It may be provided.

First Example

As shown in Figure 6, the large current supply device 20 of the present embodiment is a current control circuit 41, 42 of Figure 2 or 3 in the USB connector housing 200, 300 connected to the host 10. Configure it by inserting The first connector housing 200 has a first USB connector 201 connected to the USB terminal 11 of the host 10, and is installed in the current control circuit 41 inside the housing. The second connector housing 300 has a second USB connector 202 connected to the other USB terminal 12 of the host 10, and a current regulation circuit 42 is similarly installed inside the housing. The current control circuits 41 and 42 are formed of the circuit of FIG. 2 or 3 described above, and evenly distributes a current of up to 500 mA supplied through the USB terminals 11 and 12 of the host 10. Limit the current so that no overcurrent flows to the host.

The first USB connector housing 200 and the second USB connector housing 300 are connected through the USB cable 50, 51, and the two current control circuits 41 and 42 are electrically connected to each other. . One end of the USB cable 50, 51 is connected to a USB connector 203 for a terminal device connected to the USB terminal 31 of the USB terminal device 30. One of the USB cables 50 is responsible for the electrical connection between the first connector housing 200 and the second connector housing 300 for the rational configuration of the large current supply device 20, and one side of the other USB cable 51 The end is connected to either one of the first connector housing 200 or the second connector housing 300 electrically connected, and the other end is connected to the USB connector 203 for the terminal device. The power lines of the USB contact lines between the first connector housing 200 and the second connector housing 300 are bridged to each other, and the data lines are not connected to each other, and the contact lines are inserted into the USB connector 203 for the terminal device. Is a structure in which all data lines are connected.

The host current evenly distributed through the current control circuits 41 and 42 may be supplied with a current of 500 mA or more through the USB terminal 31 of the terminal device 30, which is described in detail with reference to FIGS. 2 and 3. As described.

7 shows an example of a configuration of a large current supply device for a USB terminal device according to the embodiment of FIG. 6 above. A current control circuit is inserted into each of the first connector housing 200 and the second connector housing 300 connected to the USB terminal of the host, and the connection between the connector housings 200 and 300 is connected to the first USB cable ( 50 is shared, and the second USB cable 51 shares the connection between the first connector housing 200 and the USB connector 203 for the terminal device.

Second Example

As shown in FIG. 8, the current control circuits 41 and 42 of FIG. 2 or 3 of the large current supply device 20 of this embodiment are installed in the USB connector housing 400 for the terminal device. That is, the current control circuits 41 and 42 are formed in a case of the USB connector 203 connected to the USB terminal 31 of the terminal device 30.

The first USB connector connected to the USB terminal 11 of the host 10 and the second USB connector connected to the other USB terminal 12 of the host 10 are respectively a first USB cable 50 and a second USB cable. It is connected to the USB connector housing 400 through (51). However, only four contact lines are connected to the USB connector 203 of the terminal device of the USB connector housing 400 with respect to any one of the first USB cable 50 and the second USB cable 51, and the other USB The cable is bridged between two power lines with the power lines of the other USB cable.

The current control circuits 41 and 42 distribute a maximum of 500 mA of host current drawn through one host USB terminal through a circuit configuration as shown in FIG. 2 or 3, and provide current so that the host is not damaged by excessive current. It regulates and supplies a current of 500mA or more to the USB terminal device (30).

Third Example

As shown in FIG. 9, the current regulating circuits 41 and 42 of the large current supply device 20 of this embodiment are constituted by a current regulating circuit device 500 having a separate housing.

The current regulating circuits 41 and 42 are constituted by a current regulating circuit device 500 having a separate housing, the first USB connector 201 is connected to the USB terminal 11 of the host 10, and the second The USB connector 202 is connected to the other USB terminal 12 of the host 10, and the USB connector 203 for the terminal device is connected with the USB terminal 31 of the USB terminal device 30. The first USB connector 201 and the first current control circuit 41 in the current control circuit device 500 are connected through a first USB cable 50, and the second USB connector 202 and the current control circuit device are connected to each other. The second current regulation circuit 42 in the 500 is connected via the second USB cable 51. Each line of the USB cables 50 and 51 in the current control circuit device 500 is connected by an optional bridge as in the embodiment of FIG. 4. That is, the data line is connected to the USB connector 203 for the terminal device through the third USB cable 510 via the current control circuit device 500 only through one of the cables 50 or 51, and the power lines are bridged with each other. .

Fourth Example

This embodiment is as shown in FIG. In the third embodiment, the current control circuits 41 and 42 are integrated together in one housing. That is, the first current control circuit 41 connected to the first USB connector 201 and the second current control circuit 42 connected to the second USB connector 202 are cased with one housing 500. However, in the fourth embodiment, the case is separated so that each current regulating circuit 41 and 42 has a separate housing 410 and 420.

The first current control circuit housing 410 is connected to the first USB connector 201 through the first USB cable, and the second current control circuit housing 420 is connected to the second USB connector 202 through the second USB cable. And the two current control circuit housings 410 and 420 are connected to each other through a third USB cable (the power lines are bridged to each other, and a USB terminal of the host connected to the first USB connector 201). The circuit is configured to communicate data only with (11)), and data communication is performed between the host 10 and the USB terminal device 30 through the USB cable No. 4, and the USB terminal device 30 is connected via the USB cable No. 4. Large currents above 500mA can be supplied.

FIG. 11 shows the characteristics of one port of the self-powered USB HUB (ATEN UH-204) used in the experiment, and the current was cut off by the protection function of the hub itself at about 850 mA. Table 1 shows the voltage of each port, the current flowing through each port, and the current flowing through the USB modem through the embodiment of the present invention of FIG. 4.

Current regulator voltage (V) Current (A) CP current CON1 current CON 2 current 5.21 0.26 0.13 0.13 4.95 0.53 0.26 0.27 4.85 0.97 0.48 0.49

As a result, the current was distributed evenly by each port, and even though the current of 970mA flowed, the current of each port was adjusted to 500mA or less, so that the current distribution function worked smoothly.

On the other hand, the scope of protection of the present invention is not limited by the embodiments explicitly described above. It is also to be noted that the scope of protection of the present invention may not be limited due to obvious changes or substitutions in the technical field to which the present invention belongs.

According to the present invention described above, there is an effect that can be supplied to the USB terminal device more than 500mA current stably.

In addition, when supplying current from a USB port to a USB terminal device, the current is distributed evenly among the USB connector ports connected to the host, causing excessive current flow to the host's specific USB port, causing physical damage to the host. Can prevent losing.

In addition, according to various embodiments of the large current supply device of the present invention there is an effect that can meet the various needs of the manufacturer.

Although effects not specifically mentioned in the specification of the present invention, it is added that the potential effects expected by the technical features of the present invention are treated as described in the specification of the present invention.

Claims (10)

A device that can supply 500 mA or more of current to a USB terminal device. A first USB connector housing connected to a USB terminal of the host; A first current control circuit embedded in the first USB connector housing; A second USB connector housing connected to the first USB connector housing by a first USB cable and having a USB connector connected to another USB terminal of the host; A second current control circuit embedded in the second USB connector housing; A second USB cable connected with the first USB connector housing or the second USB connector housing; And And a USB connector for a terminal device electrically connected to the host through the second USB cable, and connected to a USB terminal of the USB terminal device, and capable of supplying a current of 500 mA or more to the USB terminal of the USB terminal device. High current supply for USB terminal devices. A device that can supply 500 mA or more of current to a USB terminal device. A first USB connector connected to a USB terminal of the host; A second USB connector connected to another USB terminal of the host; A USB connector housing for a terminal device connected to the USB terminal of the USB terminal device; A first USB cable connecting the first USB connector to the USB connector housing for the terminal device; A second USB cable connecting the second USB connector to the USB connector housing for the terminal device; And Built in the USB connector housing for the terminal device, the current of the host through the first USB cable and the current of the host through the second USB cable are equally controlled and 500mA to the USB terminal of the USB terminal device. A large current supply device for a USB terminal device comprising a; current control circuit for supplying the above current. A device that can supply 500 mA or more of current to a USB terminal device. A first USB connector connected to a USB terminal of the host; A second USB connector connected to another USB terminal of the host; A current regulating circuit device that equally adjusts a current of a host introduced through a first USB cable connected with the first USB connector and a current of a host introduced through a second USB cable connected with the second USB connector; And And a USB connector for a terminal device connected to the current control circuit device through a third USB cable and connected to the USB terminal of the USB terminal device. The terminal device may supply a current of 500 mA or more to the USB terminal of the terminal device. High current supply for USB terminal devices. The method of claim 4, wherein The current regulating circuit device is a large current supply device for a USB terminal device, which is integrated into one housing or have a separate housing. The method according to any one of claims 1 to 4, The current regulation circuit is a large current supply device for a USB terminal device, it is to control the current using a series resistor. The method according to any one of claims 1 to 4, The current regulation circuit is a large current supply device for a USB terminal device, it is to control the current using a transistor of the series resistance and the switch function. The method according to any one of claims 1 to 4, The current regulation circuit is to limit the initial current using a capacitor, a large current supply device for a USB terminal device. The method according to any one of claims 1 to 4, The host is any one of a computer, a notebook, a USB hub, a large current supply for a USB terminal device. The method according to any one of claims 1 to 4, And the USB terminal device is a USB modem. The method according to any one of claims 1 to 4, And a USB power line of the first USB connector and the second USB connector are bridged to each other.

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