CN107562168A - Power supply adaptor with usb data read-write - Google Patents

Abstract

The invention discloses a power adapter with USB data reading and writing. The power adapter with USB data reading and writing includes: a first USB interface module, and the first USB interface module provides charging and data transmission interfaces for external devices; A second USB interface module, the second USB interface module is connected to the data lines of the first USB interface module to form a data transmission channel, and the second USB interface module provides charging and data transmission interfaces for external devices; A DC conversion module, the AC-DC conversion module provides a first DC power supply for the first USB interface module, and provides a second DC power supply for the second USB interface module. When the USB data reading and writing power adapter is connected to the first USB interface of the PC for charging, it can be connected to the second USB interface to connect USB devices related to reading and writing and communication such as U disk, USB mouse and keyboard, or to charge the mobile phone.

Description

Power adapter with USB data read and write

technical field

The invention relates to the field of power supplies, in particular to a power adapter with USB data reading and writing.

Background technique

Some electronic products such as super notebooks or tablet devices or mobile phones have only one type-c USB interface; while most USB devices related to reading and writing and communication such as U disks, USB mice and keyboards retain USBA interfaces; because the existing power adapter is only Simply provide power to super notebooks or tablet devices or mobile phones, when the user's power adapter wants to supply power to electronic devices, the power adapter occupies the only type-c USB interface; when you want to use the U disk, There is no redundant interface for USB devices related to reading, writing and communication such as USB mouse and keyboard; thus bringing a lot of inconvenience to users.

Contents of the invention

The present invention aims to solve one of the technical problems in the related art at least to a certain extent. Therefore, an object of the present invention is to provide a power adapter with USB data reading and writing.

In order to achieve the above purpose, according to the power adapter with USB data reading and writing according to the embodiment of the present invention, the power adapter with USB data reading and writing includes:

A first USB interface module, the first USB interface module provides charging and data transmission interfaces for external devices;

A second USB interface module, the second USB interface module is connected to the data line of the first USB interface module to form a data transmission channel, and the second USB interface module provides charging and data transmission interfaces for external devices;

An AC-DC conversion module, the AC-DC conversion module provides a first DC power supply for the first USB interface module, and provides a second DC power supply for the second USB interface module.

According to an embodiment of the present invention, the first USB interface module includes:

A first USB interface, the power end of the first USB interface is connected to the output end of the first DC power supply;

A first USB interface control module, the first USB interface control module is connected to the first USB interface, and the first USB interface control module controls the first USB interface to charge the external device.

According to an embodiment of the present invention, the first USB interface is a type-c interface; the first USB interface control module includes a first USB fast charging controller, and the first USB fast charging controller is a type-c interface Fast charge controller.

According to an embodiment of the present invention, the second USB interface module includes:

A second USB interface, the power end of the second USB interface is connected to the output end of the second DC power supply; the first data end of the second USB interface is connected to the first data end of the first USB interface, so The second data end of the second USB interface is connected to the second data end of the first USB interface;

A second USB interface control module, the second USB interface control module is connected to the second USB interface, and the second USB interface control module controls the second USB interface to supply power to external devices.

According to an embodiment of the present invention, the second USB interface is a USBA interface; the second USB interface control module includes a second USB fast charge controller, and the second USB fast charge controller is a fast charge identification controller .

According to an embodiment of the present invention, the AC-DC conversion module includes:

An AC-to-DC module, the AC-to-DC module converts the mains power into DC power and outputs the first DC power supply;

A DC-to-DC module, the DC-to-DC module is connected to the output end of the first DC power supply of the AC-to-DC module; the DC-to-DC module converts the first DC power supply into the second DC power supply.

According to an embodiment of the present invention, the AC to DC module includes:

A rectification and filtering module, the rectification and filtering module rectifies and filters the input AC power, and outputs a high-voltage DC power supply;

A power transformer module, the power transformer module transforms the high-voltage pulse power supply, and outputs the pulse-modulated low-voltage power supply;

A main power MOS module, under the control of a modulation signal, the main power MOS module modulates the high-voltage DC power supply into the high-voltage pulse power supply;

A modulation pulse control module, the modulation pulse control module generates the modulation signal.

According to an embodiment of the present invention, the power adapter with USB data reading and writing includes:

A first USB interface module, the first USB interface module provides charging and data transmission interfaces for external devices;

A second USB interface module, the second USB interface module is connected to the first USB interface module through a USB extension module to form a data transmission channel, and the second USB interface module provides charging and data transmission interfaces for external devices;

An AC-DC conversion module, the AC-DC conversion module provides a first DC power supply for the first USB interface module, and provides a second DC power supply for the second USB interface module.

According to an embodiment of the present invention, the power adapter with USB data reading and writing includes:

A first USB interface module, the first USB interface module provides charging and data transmission interfaces for external devices;

A second USB interface module, the second USB interface module is connected to the first USB interface module through a conversion module to form a data transmission channel, and the second USB interface module provides charging and data transmission interfaces for external devices;

An AC-DC conversion module, the AC-DC conversion module provides a first DC power supply for the first USB interface module, and provides a second DC power supply for the second USB interface module.

In the power adapter with USB data reading and writing provided in the embodiment of the present invention, when the power adapter with USB data reading and writing is connected to and charged with a notebook computer through the first USB interface, a U disk can be connected to the second USB interface , USB mouse and keyboard and other USB devices related to reading and writing and communication, or to charge mobile phones.

Description of drawings

Fig. 1 is the structural block diagram of the power adapter with USB data reading and writing that the embodiment of the present invention provides;

Fig. 2 is a structural block diagram of the first USB interface module and the second USB interface of the power adapter with USB data reading and writing provided by the embodiment of the present invention;

3 is a structural block diagram of another power adapter with a power adapter for reading and writing USB data provided by an embodiment of the present invention;

4 is a structural block diagram of another power adapter with a power adapter for reading and writing USB data provided by an embodiment of the present invention;

5 is a structural block diagram of an AC-DC conversion circuit of a power adapter with USB data reading and writing provided by an embodiment of the present invention;

6 is a schematic structural diagram of the first USB fast charging controller and its peripheral circuits and the first USB interface circuit of the power adapter with USB data reading and writing provided by the embodiment of the present invention;

Fig. 7 is a schematic structural diagram of the second USB fast charging controller and its peripheral circuit and the second USB interface circuit of the power adapter with USB data reading and writing provided by the embodiment of the present invention;

8 is a schematic structural diagram of the AC-to-DC part of the power adapter with USB data reading and writing provided by the embodiment of the present invention;

9 is a schematic structural diagram of a DC-to-DC circuit of a power adapter with USB data reading and writing provided by an embodiment of the present invention;

FIG. 10 is an application scene diagram of a power adapter with USB data reading and writing provided by an embodiment of the present invention. Reference signs:

The first USB interface module 10;

The first USB interface 101;

The first USB interface control module 102;

The second USB interface module 20;

The second USB interface 201;

The second USB interface control module 202;

AC-DC conversion module 30;

AC to DC module 301;

Rectification and filtering module 3011;

Power transformer module 3012;

Main power MOS module 3013;

Modulated pulse control module 3014;

Optocoupler control voltage circuit 3015;

Secondary rectification filter circuit 3016;

EMI filter circuit 3017;

DC to DC module 302;

The first external USB device 40;

The second external USB device 50;

Laptop 60;

tablet computer 70;

mouse80;

U disk 90;

USB extension module 11;

Conversion module 12.

The realization of the purpose of the present invention, functional characteristics and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of the invention. The terms used herein in the description of the present invention are for the purpose of describing specific embodiments only, and are not intended to limit the present invention.

Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present invention. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

Referring to Fig. 1 and Fig. 2, Fig. 1 is a structural block diagram of the power adapter with USB data reading and writing provided by the embodiment of the present invention; Fig. 2 is the first USB interface module of the power adapter with USB data reading and writing provided by the embodiment of the present invention 10 and a structural block diagram of the second USB interface 201.

An embodiment of the present invention provides a power adapter with USB data reading and writing, and the power adapter with USB data reading and writing includes: a first USB interface module 10 , a second USB interface module 20 and an AC/DC conversion module 30 . The first USB interface module 10 provides charging and data transmission interfaces for external devices. Specifically, refer to FIG. 2 , which illustrates a structural block diagram of an AC-DC conversion circuit of a power adapter with USB data reading and writing provided by an embodiment of the present invention; As shown in the figure, charging can be performed through the first USB interface module 10 and an external charging device. The external charging device includes a tablet computer 70 or a mobile phone, or other devices with USB. The data lines of the second USB interface module 20 and the first USB interface module 10 are connected to each other to form a data transmission channel. The second USB interface module 20 provides charging and data transmission interfaces for external devices. Specifically, referring to Fig. 2 and Fig. 5, Fig. 5 is a structural block diagram of an AC/DC conversion circuit of a power adapter with USB data reading and writing provided by an embodiment of the present invention; the second USB interface module 20 is connected to the first USB interface The data lines of the modules 10 are connected to each other, that is to say, the data transmission end D+ of the second USB interface 201 is connected to the data transmission end D+ of the first USB interface 101, and the data transmission end of the second USB interface 201 D- is connected to the data transmission end D- of the first USB interface 101 .

The AC-DC conversion module 30 provides the first DC power supply for the first USB interface module 10 and provides the second DC power supply for the second USB interface module 20 at the same time. Specifically, the first DC power supply provides the first DC power supply for the first USB interface module 10, and the first USB interface module 10 charges the external device through the first DC power supply. Similarly, the second USB interface module 20 supplies power to external devices through the second DC power supply.

More specifically, referring to Fig. 2 and Fig. 5; since the data transmission end D+ of the second USB interface module 20 is connected to the data transmission end D+ of the first USB interface module 10, the second USB interface module 20 The data transmission terminals D- are respectively connected to the data transmission terminals D- of the first USB interface module 10 . Thus, while the first USB interface module 10 supplies power to the external device, the second USB interface module 20 can be connected to the second external device. Moreover, the second external device can perform data communication with the charging external device on the first USB interface 101 through the second USB interface module 20 .

For example, when the first interface module is connected to the notebook computer 60 to charge the notebook computer 60, the second USB interface module 20 can be connected to a keyboard or a mouse. The notebook computer 60 is operated by communicating with the charging notebook computer 60 through the keyboard or the mouse. In addition, external devices, such as mobile phones, can also be charged through the second USB interface module 20 .

Further, in one embodiment of the present invention, the first USB interface module 10 includes: a first USB interface 101, the power end of the first USB interface 101 is connected to the output end of the first DC power supply; specifically Referring to FIG. 2 , the power terminal of the first USB interface 101 supplies power to external devices through the first DC power supply.

The first USB interface module 10 also includes a first USB interface control module 102, the first USB interface control module 102 is connected to the first USB interface 101, and the first USB interface control module 102 controls the first A USB interface 101 charges external devices. Specifically, in the implementation of the present invention, the data terminal of the first USB interface control module 102 is connected to the first USB interface 101 . That is, the data transmission terminal D+ of the first USB interface control module is connected to the data transmission terminal D+ of the first USB interface 101, and the data transmission terminal D- of the first USB interface control module is connected to the first USB interface control module respectively. The data transmission end D- of the USB interface 101 is connected. Therefore, the first interface control module can communicate with the external device through the first interface, and then control the charging current when the first USB interface module 10 charges the external device.

Further, in one embodiment of the present invention, the first USB interface control module 102 includes: a first USB fast charging controller, the power supply terminal of the first USB fast charging controller is connected to the first DC The power supply output terminal is connected; the first data terminal D+ of the first USB fast charging controller is connected to the first data terminal D+ of the first USB interface 101, and the second data terminal D- of the first USB fast charging controller It is connected with the second data terminal D- of the first USB interface 101; the first USB fast charging controller controls the first USB interface 101 to quickly charge the external device. Specifically, in the implementation of the present invention, the charging of peripheral devices is controlled by the first USB fast charging controller U4, so as to realize fast charging of external devices. More specifically, refer to FIG. 6 . FIG. 6 is a schematic structural diagram of the first USB fast charging controller U4 and its peripheral circuits and the first USB interface 101 of the power adapter with USB data reading and writing provided by the embodiment of the present invention. As shown in the figure, the first USB fast charging controller U4 communicates with the external device on the first USB interface 101 through the first data terminal D+ and the second data terminal D-, thereby controlling the external device Charging of the device. The charging control terminal USBP of the first USB fast charge controller U4 is also connected to the gate of the MOS transistor Q3, the source of the MOS transistor Q3 is connected to the output end of the first DC power supply, and the MOS transistor The drain of Q3 is connected to the power supply terminal VBUS of the first USB interface 101 . The first USB fast charge controller U4 can control the conduction or cutoff of the MOS transistor Q3 through the charging control terminal USBP, thereby controlling the conduction or cutoff of the power supply from the first DC power supply to the external device .

Preferably, in an embodiment of the present invention, the first USB interface 101 is a type-c interface; the first USB fast charging controller is a type-c interface fast charging controller. In addition, in some other embodiments of the present invention, other types of USB interfaces may also be selected.

Further, in one embodiment of the present invention, the second USB interface module 20 includes: a second USB interface 201, the power end of the second USB interface 201 is connected to the output end of the second DC power supply; The first data terminal D+ of the second USB interface 201 is connected to the first data terminal D+ of the first USB interface 101, and the second data terminal D- of the second USB interface 201 is connected to the second data terminal D- of the first USB interface. Data terminal D-connection. Specifically, the function of connecting the power terminal of the second USB interface 201 to the output terminal of the second DC power supply is the same as that of connecting the power terminal of the first USB interface 101 to the output terminal of the second DC power supply. For the sake of brevity, details are not repeated here.

More specifically, the first data terminal D+ and the second data terminal D- of the second USB interface 201 are respectively connected to the first data terminal D+ and the second data terminal D- of the first USB interface 101, thereby realizing The external device on the second USB interface 201 communicates with the external device on the first USB interface 101 through the first USB interface 101 . That is, data transmission between the external device on the first USB interface 101 and the device on the first USB interface 101 is realized.

The second USB interface module 20 also includes a second USB interface control module 202, the second USB interface control module 202 is connected to the second USB interface 201, and the second USB interface control module 202 controls the first The second USB interface 201 supplies power for external devices. Specifically, the function of the second USB interface control module 202 is the same as that of the first USB interface control module 102 . It will not be repeated here.

Further, in one embodiment of the present invention, the second USB interface control module 202 includes: a second USB fast charge controller, the power supply terminal VDD of the second USB fast charge controller is connected to the second DC The power output terminal is connected, and the first data terminal and the second data terminal of the second USB fast charge controller are respectively connected with the second USB interface 201; the second USB fast charge controller controls the second USB interface 201 Fast charging of external devices. Specifically, the function of the second USB interface control module 202 is the same as that of the first USB interface control module 102 . Here, details are not repeated. For details, please refer to the relevant description of the above-mentioned first USB fast charging controller.

As a preference, in one embodiment of the present invention, the second USB interface 201 is a USBA interface; in some other embodiments of the present invention, the second USB interface 201 can also adopt other types of interfaces, such as mini USB interface . The second USB fast charging controller is a fast charging identification controller. Referring to FIG. 7 , FIG. 7 is a schematic structural diagram of the second USB fast charge controller and its peripheral circuits and the second USB interface 201 of the power adapter with USB data reading and writing provided by the embodiment of the present invention. As shown in the figure, the second USB fast charging controller U5 communicates with the external device on the second USB interface 201 through the first data terminal D+ and the second data terminal D-, thereby controlling the external device Charging of the device. The power supply terminal VCC of the second USB fast charge controller U5 and the power supply terminal VCC of the second USB interface 201 are respectively connected to the second DC power supply.

It should be noted that, in some other embodiments of the present invention, the first USB fast charge controller U4 and the second USB fast charge controller U5 may also be integrated in the same integrated chip, which is not limited to the present invention Provide the form.

Further, in an embodiment of the present invention, the AC-to-DC conversion module 30 includes: an AC-to-DC module 301, the AC-to-DC module 301 converts mains power into DC power, and outputs the first DC power Power supply; the AC-to-DC conversion module 30 also includes a DC-to-DC module 302, and the DC-to-DC module 302 is connected to the first DC power supply output end of the AC-to-DC module 301; the DC-to-DC module 302 Convert the first DC power supply into the second DC power supply.

Specifically, refer to Fig. 8 and Fig. 9. Fig. 8 is a schematic structural diagram of the AC to DC part of the power adapter with USB data reading and writing provided by the embodiment of the present invention; Fig. 9 is a schematic diagram of the circuit with USB data reading and writing provided by the embodiment of the present invention Schematic diagram of the DC-to-DC circuit structure of the power adapter. As shown in FIG. 9 , the DC-to-DC power supply module U3 converts the first DC power supply V+ and outputs the second DC power supply V2+.

Further, in one embodiment of the present invention, the AC-to-DC module 301 includes: a rectification and filtering module 3011, the rectification and filtering module 3011 rectifies and filters the input AC power, and outputs a high-voltage DC power supply; the AC-to-DC The module 301 also includes a power transformer module 3012, the power transformer module 3012 transforms the high-voltage pulse power supply, and outputs a pulse-modulated low-voltage power supply; the AC-to-DC module 301 also includes a main power MOS module 3013, the main power The MOS module 3013 modulates the high-voltage DC power supply into the high-voltage pulse power supply under the control of the modulation signal; the AC-to-DC module 301 also includes a modulation pulse control module 3014, and the modulation pulse control module 3014 generates the modulation signal .

Specifically, referring to FIG. 8, the rectification and filtering module 3011 includes: a rectification bridge composed of a first diode DA1, a second diode DA2, a third diode DA3, and a fourth diode DA4. Capacitor CE1 and second filter capacitor CE2, first filter sense L1; the power transformer module 3012 includes a transformer T; the main power MOS module 3013 includes a MOS transistor Q1; the modulation pulse control module 3014 includes a modulation pulse controller U1.

Further, the AC to DC module 301 also includes an EMI (Electromagnetic Interference) filter circuit, and the EMI filter circuit 3017 filters electromagnetic interference signals.

Referring to Figure 3 and Figure 4, Figure 3 is a structural block diagram of another power adapter with a power adapter with USB data reading and writing provided by an embodiment of the present invention; Figure 4 is a block diagram of a power adapter with USB data reading and writing provided by an embodiment of the present invention Another structural block diagram of the power adapter.

Further, in some other embodiments of the present invention, the first USB interface module 10 and the second USB interface module 20 are connected through a USB extension module to form a data transmission channel. Specifically, the USB extension module extends the USB interface. For example, multiple USB interfaces are extended.

Furthermore, in some other embodiments of the present invention, the first USB interface module 10 and the second USB interface module 20 are connected through a conversion module to form a data transmission channel. Specifically, the conversion module performs type conversion on the transmission data of the first USB interface module and the second USB interface module. For example, convert D-, D+ type data to TX-, TX+, RX- or RX+ data type.

FIG. 10 is an application scene diagram of a power adapter with USB data reading and writing provided by an embodiment of the present invention.

In the power adapter with USB data reading and writing provided in the embodiment of the present invention, when the USB data reading and writing power adapter is connected and charged to the notebook computer 60 through the first USB interface 101 (such as: Type-c interface), it can On the second USB interface 201 (such as: USBA interface), connect U disk 90, USB mouse and keyboard etc. to read and write and communicate relevant USB devices or charge the mobile phone.

The above are only embodiments of the present invention, but do not limit the patent scope of the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still carry out the above-mentioned each Modifications to the technical solutions described in the method, or equivalent replacement of some of the technical features. All equivalent structures made by utilizing the contents of the specification and drawings of the present invention and directly or indirectly used in other related technical fields are also within the protection scope of the patent of the present invention.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (9)

1. A kind of 1. power supply adaptor with usb data read-write, it is characterised in that the power supply adaptor with usb data read-write Including：

   First usb interface module, first usb interface module provide charging and data transmission interface for external equipment；

   Secondary USB interface module, the secondary USB interface module and the data wire of first usb interface module are connected with each other, Data transmission channel is formed, the secondary USB interface module provides charging and data transmission interface for external equipment；

   Ac-dc conversion module, the ac-dc conversion module provide the first dc source for first usb interface module, are The secondary USB interface module provides the second dc source.
2. 2. the power supply adaptor with usb data read-write according to right wants 1, it is characterised in that the first USB interface mould Block includes：

   First USB interface, the first USB interface power end are connected with first DC power output end；

   First USB interface control module, first USB interface control module are connected with first USB interface, and described first It is charging external equipment that USB interface control module, which controls first USB interface,.
3. 3. the power supply adaptor according to claim 2 with usb data read-write, it is characterised in that first USB interface For type-c type interfaces；First USB interface control module includes the first USB fast charge controllers, the first USB fast charge controllers For type-c interface fast charge controllers.
4. 4. the power supply adaptor according to claim 2 with usb data read-write, it is characterised in that the secondary USB interface Module includes：

   Secondary USB interface, the secondary USB interface power end are connected with second DC power output end；2nd USB First data terminal of interface is connected with the first data terminal of first USB interface, the second data terminal of the secondary USB interface It is connected with the second data terminal of first USB interface；

   Secondary USB interface control module, the secondary USB interface control module are connected with the secondary USB interface, and described second USB interface control module controls the secondary USB interface to be powered for external equipment.
5. 5. the power supply adaptor according to claim 4 with usb data read-write, it is characterised in that the secondary USB interface For USBA interfaces；The secondary USB interface control module includes the 2nd USB fast charge controllers, the 2nd USB fast charge controllers For fast charge identification controller.
6. 6. the power supply adaptor according to claim 1 with usb data read-write, it is characterised in that the ac-dc conversion Module includes：

   Exchange turns DC Module, and the exchange, which turns DC Module, will be converted into civil power in direct current, and export first direct current Power supply；

   DC-DC module, the DC-DC module with it is described exchange turn DC Module first dc source it is defeated Go out end connection；First dc source is converted into second dc source by the DC-DC module.
7. 7. the power supply adaptor according to claim 6 with usb data read-write, it is characterised in that the exchange turns direct current Module includes：

   Rectification filtering module, the rectification filtering module carries out rectifying and wave-filtering to input AC electricity, and exports high-voltage DC power supply；

   Power supply voltage changing module, the power supply voltage changing module carry out transformation to high-voltage pulse power source, export impulse modulation low-tension supply；

   The high-voltage DC power supply is modulated into by main power MOS modules, the main power MOS modules under modulated signal control The high-voltage pulse power source；

   Pulse control module is modulated, the modulation pulse control module produces the modulated signal.
8. A kind of 8. power supply adaptor with usb data read-write, it is characterised in that the power supply adaptor with usb data read-write Including：

   First usb interface module, first usb interface module provide charging and data transmission interface for external equipment；

   Secondary USB interface module, the secondary USB interface module are connected with first usb interface module by usb expansion module Connect, form data transmission channel, the secondary USB interface module provides charging and data transmission interface for external equipment；

   Ac-dc conversion module, the ac-dc conversion module provide the first dc source for first usb interface module, are The secondary USB interface module provides the second dc source.
9. A kind of 9. power supply adaptor with usb data read-write, it is characterised in that the power supply adaptor with usb data read-write Including：

   First usb interface module, first usb interface module provide charging and data transmission interface for external equipment；

   Secondary USB interface module, the secondary USB interface module are connected with first usb interface module by modular converter, Data transmission channel is formed, the secondary USB interface module provides charging and data transmission interface for external equipment；

   Ac-dc conversion module, the ac-dc conversion module provide the first dc source for first usb interface module, are The secondary USB interface module provides the second dc source.