WO2013159719A1

WO2013159719A1 - Universal serial bus (usb) head and usb device having usb head

Info

Publication number: WO2013159719A1
Application number: PCT/CN2013/074725
Authority: WO
Inventors: 王晓东; 陈坚
Original assignee: 华为终端有限公司
Priority date: 2012-04-25
Filing date: 2013-04-25
Publication date: 2013-10-31
Also published as: CN202550228U

Abstract

A USB head and a USB device having the USB head belong to the technical field of communications. The USB head comprises a metal shell and an insulating base disposed in the metal shell. One end of the insulating base is disposed with a conductive terminal, and the conductive terminal comprises two data transmission terminals, a grounding terminal, and a power source terminal. The other end of the insulating base is disposed with an output terminal corresponding to the conductive terminal. An interference filtering component is further disposed on the insulating base, and the interference filtering component is connected between the data transmission terminal and an output terminal corresponding to the data transmission terminal. The USB device comprises a main body and a USB head installed on the main body. The interference filtering component is disposed in the USB head, so that the maintenance cost of a wireless data card can be lowered.

Description

Universal Serial Bus USB Head and USB Device with the USB Header This application is filed on April 25, 2012 and filed on the Chinese Patent Office, the application number is CN 201220180511. 2. The invention name is "Universal Serial Bus USB Head and has this Priority of the Chinese Patent Application for USB Headset USB Device, the entire contents of which are hereby incorporated by reference. Technical field

The utility model relates to the technical field of communication, in particular to a USB (Universal Serial Bus) head and a USB device having the USB head.

Background technique

A wireless data card is a type of wireless terminal product, which is usually connected to a computer through a USB head, so that users can enjoy wireless Internet access, text messaging, and e-mail applications in places where wireless telephone signals are covered. When the USB head operates in high-speed mode (data transmission rate 480Mb/s), harmonics are generated. The spatial radiation interference caused by harmonics will affect the normal operation of the wireless terminal equipment at the receiving end, for example, leading to GSM (Global System of Mobile communication). The global mobile cloud communication system (TSS) has a TAS (Total Isotropic Sensitivity) drop of more than a dozen dB. Therefore, it is common to set a filtering interference device in the wireless data card to filter out harmonics.

As shown in FIG. 1 , the existing wireless data card generally includes a main body 21 and a USB head 22, and the USB head 22 includes a metal case and an insulating seat (not shown) disposed in the metal case, and one end of the insulating seat is provided with a conductive terminal. (Golden finger) for inserting with a computer; the other end of the insulating seat is provided with a soldering portion 22a of a conductive terminal for soldering on a printed circuit board in the wireless data card main body 21. The filtering interference device 23 is usually disposed on the printed circuit board near the USB head 22, such as between the soldering portions 22a of the conductive terminals of the USB head 22.

In the process of implementing the present invention, the inventors found that the prior art has at least the following problems:

Since the filtering interference device is placed close to the USB head, it is easy to damage the filtering interference device during the process of repairing and replacing the USB head device, which increases maintenance difficulty and maintenance cost.

Summary of the invention

In order to solve the problem of the prior art, when the USB head of the wireless data card is repaired and replaced, the problem of filtering the interference device is easily damaged. The embodiment of the present invention provides a USB header and a device having the USB header.

In one aspect, the embodiment of the present invention provides a universal serial bus USB head, the USB head includes: a metal case and an insulating seat disposed in the metal case, and one end of the insulating seat is provided with a conductive terminal. Conductive terminal The utility model comprises two data transmission terminals, a grounding terminal and a power terminal, wherein the other end of the insulating seat is provided with an output terminal corresponding to the conductive terminal, and the insulating seat is further provided with a filtering interference device, the filter The interfering device is connected between the data transmission terminal and an output terminal corresponding to the data transmission terminal.

In another aspect, the embodiment of the present invention further provides a USB device having the USB header, the USB device comprising: a main body and a USB head mounted on the main body, wherein the USB head is the USB head. The technical solution provided by the embodiment of the present invention has the beneficial effects that the filtering device is disposed on the insulating seat inside the USB head, so when the USB head of the USB device is repaired and replaced, it is not easy to filter out the interference device. Damaged, reducing costs.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some implementations of the present invention. For example, other drawings may be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a schematic structural diagram of a wireless data card in the prior art;

2 is a partial structural diagram of a USB head provided in Embodiment 1 of the present invention;

3 is a partial structural schematic view of a USB head provided in Embodiment 2 of the present invention;

4a is a detailed circuit configuration diagram of a trap circuit provided in Embodiment 2 of the present invention;

4b is another detailed circuit structure diagram of the trap circuit provided in Embodiment 2 of the present invention; FIG. 5 is a partial structural diagram of the USB head provided in Embodiment 3 of the present invention;

FIG. 6 is a partial schematic structural diagram of a USB device provided in Embodiment 4 of the present invention.

detailed description

The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

Example 1

As shown in FIG. 2, the embodiment of the present invention provides a USB head. The USB head includes a metal casing (not shown), an insulating seat 11 disposed in the metal casing, and one end of the insulating seat 11 is provided with a conductive terminal 12. (Golden Finger) The other end of the insulating base 11 is provided with output terminals 13a-13d corresponding to the conductive terminals 12. Conductive terminal 12 includes two numbers According to the transmission terminals D+ and D-, a ground terminal GND and a power supply terminal VBUS. The insulating seat 11 is further provided with a filtering interference device 15, and the filtering interference device 15 is connected between the data transmission terminal and the output terminal corresponding to the data transmission terminal.

Specifically, the filtering interference device 15 includes, but is not limited to, a trap circuit (described in detail below), an EMCX Electromagnetic Compatility (IG) filter chip, an EMI (Electro Magnetic Interference) filter chip, etc. limit.

The embodiment of the present invention can effectively suppress high-frequency harmonic radiation interference and improve the working performance of the wireless terminal product by providing a filtering interference device on the insulating seat of the USB head. At the same time, since the filtering interference device is located inside the USB head, it is not easily damaged and the cost is reduced when the USB head of the USB device (such as a wireless data card) is repaired and replaced. Example 2

The embodiment of the present invention provides a USB head. As shown in FIG. 3, the structure of the USB head is basically the same as that of the embodiment 1. The only difference is that in the embodiment, the insulating seat 11 is further provided. The printed circuit board 14 is provided on the printed circuit board 14 and is disposed on the insulating base 11. It will be understood by those skilled in the art that the printed circuit board 14 is different from the circuit board in the main body of the USB device, and the printed circuit board 14 is dedicated to the placement of the filtering interference device 15 and the anti-static discharge device and the anti-surge circuit which will be described later. And other components.

In this embodiment, the filtering interference device is disposed in the USB head through the printed circuit board, and the effect of suppressing high-frequency harmonic radiation interference can be further improved, and the working performance of the wireless terminal product is improved.

Preferably, the printed circuit board 14 is an FPC (Flexible Printed Circuit) board. Since the size of the FPC board can be made very small, it can be embedded in the USB header without affecting the overall size of the USB head.

Specifically, the filtering interference device 15 includes a pair of trap circuits 15a and 15b, and the trap circuit 15a is connected between the data transmission terminal D- and the output terminal 13a corresponding to the data transmission terminal D-, and the trap circuit 15b is connected to the data. The transmission terminal D+ is between the output terminal 13b corresponding to the data transmission terminal D+.

Further, as shown in FIG. 4a, in a specific embodiment of the embodiment, each trap circuit includes a set of sub-circuits including an inductor and a capacitor, and the inductor and capacitor in the set of sub-circuits in parallel. The notch circuit 15a includes an inductor L111 and a capacitor C111, and the trap circuit 15b includes an inductor L121 and a capacitor C121. The values of the inductor and capacitor in the sub-circuit can be selected according to actual needs to filter out interference signals of different frequencies.

Optionally, as shown in FIG. 4b, in another embodiment of this embodiment, each trap circuit includes Two sets of sub-circuits are cascaded, each set of sub-circuit inductors and capacitors, and the inductance and capacitance of each set of sub-circuits are connected in parallel. The notch circuit 15a includes two sets of inductors and capacitors, the first group is L21 1 and C21 1 , the second group is L212 and C212; the trap circuit 15b also includes two sets of inductors and capacitors, and the first group is L221 and C221 The second group is L222 and C222. The number of sets of sub-circuits in each trap circuit can also be set according to actual needs, and is not limited to the above one or two groups. By setting multiple sets of sub-circuits, it is possible to simultaneously filter out interference signals of different frequency segments. The embodiment of the utility model can effectively suppress the interference of the high-frequency harmonic radiation and improve the working performance of the wireless terminal product by providing the filtering interference device on the insulating seat of the USB head. At the same time, since the filtering interference device is located inside the USB head, when the USB head of the USB device (such as a wireless data card) is repaired and replaced, it is not easily damaged and the cost is reduced. In addition, a trap circuit composed of an inductor and a capacitor is used as a filtering interference device, and the interference inductance signal of different frequencies can be filtered by setting a capacitance inductance value thereof, which is very flexible and low in cost. Example 3

The embodiment of the present invention provides a USB head. As shown in FIG. 5, the USB head is different from the USB head of Embodiment 2 in that, in this embodiment, the printed circuit board 14 is further provided with an anti-ESD. (Electro-Static Discharge, Electrostatic Discharge) device 26, the ESD-preventing device 26 is connected in series between the filtering interference device 15 and the data transmission terminals D-, D+. Specifically, the ESD prevention device 26 is connected in series between the trap circuits 15a, 15b and their corresponding data transfer terminals D -, D+. The ESD protection device 26 prevents electrostatic discharge from damaging chips and electronic components in the wireless data card. Those skilled in the art will appreciate that the number of anti-ESD devices 26 is not limited and may be determined according to actual needs.

Specifically, the ESD preventing device 26 includes a TVS (Transient Voltage Suppressor) diode or a varistor.

Preferably, the printed circuit board 14 of the USB head of the embodiment is further provided with an anti-surge circuit 27, and the anti-surge circuit 27 is connected in series between the power terminal VBUS and the output terminal 13c corresponding to the power terminal VBUS. The anti-surge circuit 27 can avoid the impact of electric surges on electronic components and effectively protect electronic components.

Specifically, the anti-surge circuit 27 can be a dedicated IC (Integrated Circuit) chip or a slow start circuit. The slow start circuit may be constituted by a capacitive resistance device, which is well known to those skilled in the art, and a detailed description is omitted here. In addition, those skilled in the art can understand that the number of the anti-surge circuit 27 is not limited and can be determined according to actual needs. The embodiment of the utility model can effectively suppress the interference of the high-frequency harmonic radiation and improve the working performance of the wireless terminal product by providing the filtering interference device on the insulating seat of the USB head. At the same time, since the filtering interference device is located inside the USB head, when the USB head of the USB device (such as a wireless data card) is repaired and replaced, it is not easily damaged and the cost is reduced. In addition, a trap circuit composed of an inductor and a capacitor is used as a filtering interference device, and the interference inductance signal of different frequencies can be filtered by setting a capacitance inductance value thereof, which is very flexible and low in cost. Example 4

In this embodiment, a USB data device of the present invention will be described by taking a wireless data card as an example. As shown in FIG. 6, the embodiment provides a wireless data card, which includes a main body 31 and a USB head 32 mounted on the main body 31. The USB head 32 can be the USB provided in Embodiment 1-3. head.

It should be noted that the USB device of the present invention includes but is not limited to a wireless data card.

Specifically, the output terminal of the USB head 32 in the figure is connected to the circuit board in the main body through a metal pad, and it is easy to know that it can also be connected to the circuit board in the main body through an FPC board or an extension cable. The embodiment of the present invention can effectively suppress high-frequency harmonic radiation interference and improve the working performance of the wireless terminal product by providing a filtering interference device on the insulating seat of the USB head. At the same time, since the filtering interference device is located inside the USB head, it is not easily damaged and the cost is reduced when the USB head of the USB device (such as a wireless data card) is repaired and replaced. In addition, a trap circuit composed of an inductor and a capacitor is used as a filtering interference device, and the interference signal of different frequencies can be filtered by setting a capacitance inductance value thereof, which is very flexible and low in cost. In addition, the external data size of the wireless data card can be further reduced, making the shape design of the wireless data card more beautiful. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and principles of the present invention, should be included in the present invention. The scope of protection of utility models.

Claims

Rights request

A universal serial bus USB head, wherein the USB head comprises: a metal case and an insulating seat disposed in the metal case, wherein one end of the insulating seat is provided with a conductive terminal, and the conductive terminal The utility model comprises two data transmission terminals, a grounding terminal and a power terminal, wherein the other end of the insulating seat is provided with an output terminal corresponding to the conductive terminal, and the insulating seat is further provided with a filtering interference device, the filter The interfering device is connected between the data transmission terminal and an output terminal corresponding to the data transmission terminal.

2. The USB head according to claim 1, wherein the insulating holder is further provided with a printed circuit board, and the filtering interference device is disposed on the printed circuit board.

The USB head according to claim 1 or 2, wherein the filtering interference device comprises a pair of trap circuits, and the pair of trap circuits are respectively connected to the two data transmission terminals and Between the output terminals corresponding to the two data transmission terminals.

4. The USB header of claim 3, wherein each of the trap circuits comprises a set of sub-circuits, the set of sub-circuits comprising an inductor and a capacitor, the inductor and the capacitor being connected in parallel.

5. The USB header of claim 3, wherein each of the trap circuits comprises a plurality of cascaded sub-circuits, each set of sub-circuits comprising an inductor and a capacitor, and each set of the sub-circuits The inductor and capacitor are connected in parallel.

The USB head according to claim 2, wherein the printed circuit board is further provided with an antistatic discharge device, and the antistatic discharge device is serially connected to the filtering interference device and the data transmission Between the terminals.

7. The USB head according to claim 6, wherein the antistatic discharge device comprises a transient voltage suppression diode or a varistor.

The USB head according to claim 2, wherein the printed circuit board is further provided with a surge protection circuit, and the anti-surge circuit is serially connected to the power terminal and the power terminal. Between the output terminals.

9. The USB head according to claim 8, wherein the anti-surge circuit is a slow start circuit.

The USB head according to claim 2, wherein the printed circuit board is a flexible printed circuit board.

A universal serial bus USB device, the USB device comprising: a main body and a universal serial bus USB head mounted on the main body, wherein the USB head is any one of claims 1-10 The USB header.

12. The device according to claim 11, wherein the USB device is a wireless data card.