CN205595780U - Electrostatic protection device of USB interface - Google Patents

Abstract

The utility model discloses an electrostatic protection device of USB interface, this electrostatic protection device of USB interface include that static bleed off circuit, static block that circuit, USB input connector and USB output connect, the electrostatic discharge circuit, a termination USB input connector, another termination static stops the circuit, static stops the circuit, a termination static bleed off circuit, and another termination USB exports the joint. The utility model discloses has realized releasing and stopping static is effectual with very succinct circuit and PCB's optimal design, has protected the system, through to data line D D+, USB's power and ground wire are handled to the omnidirectional has protected the system not receive the interference of static.

Description

A kind of electrostatic protection apparatus of USB interface

Technical field

This utility model relates to technical field of electronic products, particularly relates to the electrostatic protection apparatus of a kind of USB interface.

Background technology

Development and progress along with technology, USB (USB (universal serial bus)) pin is fast with its speed, compatibility is good, do not account for interruption, can concatenate, support that the features such as hot plug are increasingly favored by people, particularly Micro USB Yu USB3.0 occurs, they with miniaturization and speed soon as feature, constantly apply on various equipment, such as mobile phone, computer, household electrical appliances and various portable set, standard, indispensable pin are the most become.But, owing to USB pin is directly facing various equipment, data wire is directly accessed chip, and these chips are very sensitive to Electro-static Driven Comb, the faintest electrostatic will allow the interruption of data, loss the most in the transmission, even damage, be more seriously to cause burning of chip, allow whole system collapse.

So, electrostatic defending to USB pin is necessary, but there is various shortcoming in the electrostatic defending measure of existing USB pin, or is to implement complicated, cost intensive, transmission to data can impact, or is not in place to electrostatic defending.

Refer to Fig. 1, Fig. 1 is the electrostatic defending schematic diagram used by CN 203813430 U, and it has the disadvantage that: one is that on data wire D-/D+, institute's series resistor and institute's shunt-wound capacitance are too big, has a strong impact on the transmission of data；Two is not protect ground wire and power line, and electrostatic can enter system by this both threads, causes protective capacities to be deteriorated.

Furthermore, electrostatic defending is a systematic engineering, not only to realize in principle, more to be embodied in PCB design, and only both combine, and cooperate, could realize the intact protection to electrostatic, and cannot complete with prior art.

Utility model content

In order to overcome all deficiencies of existing Related product; the utility model proposes the electrostatic protection apparatus of a kind of USB interface; design to achieve with the optimization of the most succinct circuit and PCB and electrostatic is effectively released and stops; protect system; by processing the power supply of data wire D-/D+, USB and ground wire, thus the omnibearing system that protects is not disturbed by electrostatic.

This utility model solves its technical problem and be the technical scheme is that

The electrostatic protection apparatus of a kind of USB interface provided by the utility model, including: static discharge circuit, electrostatic stop circuit, USB input adapter and USB out splice going splice；Described static leakage circuit, a termination USB input adapter, another termination electrostatic stops circuit；Described electrostatic stops circuit, and a termination static discharge circuit, another terminates USB out splice going splice.

As further improvement of the utility model, described static discharge circuit includes electric capacity C1, C2 and diode D1, D2, D3, D4 and casing ground PGND；Described electric capacity C1 and diode D1 is in parallel, and it connects the one of end and terminates D+ pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described electric capacity C2 and diode D2 is in parallel, and it connects the one of end and terminates D-pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described diode D3 mono-terminates VSS pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described diode D4 mono-terminates VBUS pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND.

As further improvement of the utility model, described diode D1, D2, D3, D4 are TVS diode.

As further improvement of the utility model, described electrostatic stops that circuit includes resistance R1, R2, electric capacity C3, C4, C5, C6 and magnetic bead FB1, FB2；Described electric capacity C3 with C4 is in parallel, and it connects a termination magnetic bead FB2 of end, the VSS pin of another termination USB out splice going splice；Described resistance R1 mono-termination capacitor C1 and diode D1 connect end, the D+ pin of another termination USB out splice going splice and one end of electric capacity C5；The VSS pin of another termination USB out splice going splice of described electric capacity C5；Described resistance R2 mono-termination capacitor C2 and diode D2 connect end and the D-pin of USB input adapter, the D-pin of another termination USB out splice going splice and one end of electric capacity C6；The VSS pin of another termination USB out splice going splice of described electric capacity C6；Described magnetic bead FB1 mono-terminates VSS pin and the diode D3 of USB input adapter, the VSS pin of another termination USB out splice going splice；Described magnetic bead FB2 mono-terminates VBUS pin and the electric capacity D4 of USB input adapter, and another termination capacitor C3 connects end and the VBUS pin of USB out splice going splice with C4's.

As further improvement of the utility model, the electrostatic protection apparatus of described USB interface also includes PCB element, static discharge circuit and electrostatic stop that circuit is located on PCB element, described resistance R1, R2 and magnetic bead FB1, FB2 be neat parallel arranged on PCB element, and in this, as the cut-point of ground wire.

As further improvement of the utility model, described PCB connects casing ground PGND in resistance R1, R2 and magnetic bead FB1, FB2 wherein one end as boundary with neat parallel arranged, and the other end connects the VSS pin of USB out splice going splice.

As further improvement of the utility model, described USB input adapter is the USB female seat of a standard, has polytype connecter type, includes but not limited to TAPE-A, TAPE-C, MINI-USB and MICOR-USB.

Compared with prior art, this utility model has the advantage that

1, the optimization design using the most succinct circuit and PCB achieves effectively to be released to electrostatic and stops, protecting system, by processing the power supply of data wire D-/D+, USB and ground wire, thus the omnibearing system that protects is not disturbed by electrostatic.

2, due to the design of simple circuit, only used a small amount of components and parts, and the little cost of area taking face PCB is the cheapest.

3, the most both do not had and the electric capacity of the United Nations General Assembly's capacitance had not the most been connected the resistance of big resistance, and the data of high-speed transfer will not have been impacted and make data skew, it is ensured that the two-forty of data transmission and accuracy.

Accompanying drawing explanation

Fig. 1 is the electrostatic defending schematic diagram used by CN 203813430U；

Fig. 2 is the theory diagram of this utility model specific embodiment；

Fig. 3 is the circuit theory diagrams of this utility model specific embodiment；

Fig. 4 is the PCB design scattergram of this utility model specific embodiment

Fig. 5 is the PCB design trace-diagram of this utility model specific embodiment.

Detailed description of the invention

For the ease of understanding this utility model, below with reference to relevant drawings, this utility model is described more fully.Accompanying drawing gives preferred embodiment of the present utility model.But, this utility model can realize in many different forms, however it is not limited to embodiment described herein.On the contrary, providing the purpose of these embodiments is to make the understanding to disclosure of the present utility model more thorough comprehensively.

Unless otherwise defined, all of technology used herein and scientific terminology are identical with belonging to the implication that those skilled in the art of the present utility model are generally understood that.It is intended merely to describe the purpose of specific embodiment at term used in the description of the present utility model herein, it is not intended that in limiting this utility model.

Refering to shown in Fig. 2, the electrostatic protection apparatus of described USB interface, including: static discharge circuit, electrostatic stop circuit, USB input adapter and USB out splice going splice；Described static leakage circuit, a termination USB input adapter, another termination electrostatic stops circuit；Described electrostatic stops circuit, and a termination static discharge circuit, another terminates USB out splice going splice.

Refering to shown in Fig. 3, described USB input adapter, as the USB female seat that the input of signal is a standard, has polytype connecter type, includes but not limited to TAPE-A, TAPE-C, MINI-USB and MICOR-USB.

Described static discharge circuit includes electric capacity C1, C2 and diode D1, D2, D3, D4 and casing ground PGND；Described electric capacity C1 and diode D1 is in parallel, and it connects the one of end and terminates D+ pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described electric capacity C2 and diode D2 is in parallel, and it connects the one of end and terminates D-pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described diode D3 mono-terminates VSS pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described diode D4 mono-terminates VBUS pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND.Described static leakage circuit, releasing for electrostatic, when electrostatic enters system by USB input adapter, on electrostatic leakage to casing ground PGND.

Described electrostatic stops that circuit includes resistance R1, R2, electric capacity C3, C4, C5, C6 and magnetic bead FB1, FB2；Described electric capacity C3 with C4 is in parallel, and it connects a termination magnetic bead FB2 of end, the VSS pin of another termination USB out splice going splice；Described resistance R1 mono-termination capacitor C1 and diode D1 connect end, the D+ pin of another termination USB out splice going splice and one end of electric capacity C5；The VSS pin of another termination USB out splice going splice of described electric capacity C5；Described resistance R2 mono-termination capacitor C2 and diode D2 connect end and the D-pin of USB input adapter, the D-pin of another termination USB out splice going splice and one end of electric capacity C6；The VSS pin of another termination USB out splice going splice of described electric capacity C6；Described magnetic bead FB1 mono-terminates VSS pin and the diode D3 of USB input adapter, the VSS pin of another termination USB out splice going splice；Described magnetic bead FB2 mono-terminates VBUS pin and the electric capacity D4 of USB input adapter, and another termination capacitor C3 connects end and the VBUS pin of USB out splice going splice with C4's.Described electrostatic stops circuit, for the stop to electrostatic, when electrostatic enters system by USB input adapter, electrostatic is stopped, and does not allow electrostatic enter system, and remaining electrostatic is imported to the VSS pin of USB out splice going splice.

When electrostatic enters system by USB input adapter J1, entering if electrostatic is the shell SHLD (hole, location) by USB input adapter, because shell is connected to casing ground PGND, then electrostatic is directly released to casing；If electrostatic is entered by the VBUS pin of USB input adapter, under the stop of magnetic bead FB2, electrostatic is released to casing ground PGND by TVS diode D4, and remaining electrostatic also can be released to the VSS pin of USB out splice going splice by electric capacity C3, C4；If electrostatic is entered by the D-pin of USB input adapter, under the stop of resistance R2, electrostatic is released to casing ground PGND by electric capacity C2 and TVS diode D2, and remaining electrostatic also can be released to the VSS pin of USB out splice going splice by electric capacity C6；If electrostatic is entered by the D+ pin of USB input adapter, under the stop of the R1 of resistance, electrostatic is released to casing ground PGND by electric capacity C1 and TVS diode D1, and remaining electrostatic also can be released to the VSS pin of USB out splice going splice by electric capacity C5；If electrostatic is entered by the VSS pin of USB input adapter, under the stop of the FB1 of magnetic bead, electrostatic is released to casing ground PGND by TVS diode D3.

Refering to shown in Fig. 4 and Fig. 5, the electrostatic protection apparatus of described USB interface also includes PCB element, static discharge circuit and electrostatic stop that circuit is located on PCB element, described resistance R1, R2 and magnetic bead FB1, FB2 is neat parallel arranged on PCB element, and in this, as the cut-point of ground wire, resistance R1 with neat parallel arranged, R2 and magnetic bead FB1, wherein one end that FB2 is boundary connects casing ground PGND and electrostatic is incorporated into casing, the other end connects the VSS pin of USB out splice going splice, accordingly even when electrostatic leakage is not done quiet by casing, electrostatic passes through resistance R1, R2 is released to the D-/D+ of USB out splice going splice, again by electric capacity C5, C6 also can import to electrostatic the VSS pin of USB out splice going splice.The two ends that described R1, R2, FB1, FB2 with neat parallel arranged is divided into boundary are shown in dotted line, and dotted line is not included in protection domain of the present utility model.By to the segmentation of ground wire and the layout of element, making electrostatic be released by rational path.

When electrostatic enters system by USB input adapter J1; because electrostatic is the most at first by local electric discharge that shortest path of releasing, impedance are minimum; can be seen that from Fig. 4 and Fig. 5; under the stop of R1, R2, FB1, FB2; the VSS pin of casing ground PGND Yu USB out splice going splice has absolute segmentation; so the casing ground PGND point that to be shortest path, impedance minimum, electrostatic can be discharged by casing ground PGND, thus protect system and will not suffer damage.

This utility model uses the optimization design of the most succinct circuit and PCB to achieve and effectively releases electrostatic and stop, protects system.By processing the power supply of data wire D-/D+, USB and ground wire, thus the omnibearing system that protects is not disturbed by electrostatic.

Above-described embodiment is this utility model preferably embodiment; but embodiment of the present utility model is also not restricted to the described embodiments; other any without departing from the change made under spirit of the present utility model and principle, modify, substitute, combine, simplify; all should be the substitute mode of equivalence, within being included in protection domain of the present utility model.

Claims (7)

1. the electrostatic protection apparatus of a USB interface, it is characterised in that including: static discharge circuit, electrostatic stop circuit, USB input adapter and USB out splice going splice；Described static leakage circuit, a termination USB input adapter, another termination electrostatic stops circuit；Described electrostatic stops circuit, and a termination static discharge circuit, another terminates USB out splice going splice.

2. the electrostatic protection apparatus of USB interface as claimed in claim 1, it is characterised in that: described static discharge circuit includes electric capacity C1, C2 and diode D1, D2, D3, D4 and casing ground PGND；Described electric capacity C1 and diode D1 is in parallel, and it connects the one of end and terminates D+ pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described electric capacity C2 and diode D2 is in parallel, and it connects the one of end and terminates D-pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described diode D3 mono-terminates VSS pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND；Described diode D4 mono-terminates VBUS pin and the electrostatic stop circuit of USB input adapter, the other end with picking shell PGND.

3. the electrostatic protection apparatus of USB interface as claimed in claim 2, it is characterised in that: described diode D1, D2, D3, D4 are TVS diode.

4. the electrostatic protection apparatus of USB interface as claimed in claim 1, it is characterised in that: described electrostatic stops that circuit includes resistance R1, R2, electric capacity C3, C4, C5, C6 and magnetic bead FB1, FB2；Described electric capacity C3 with C4 is in parallel, and it connects a termination magnetic bead FB2 of end, the VSS pin of another termination USB out splice going splice；Described resistance R1 mono-termination capacitor C1 and diode D1 connect end, the D+ pin of another termination USB out splice going splice and one end of electric capacity C5；The VSS pin of another termination USB out splice going splice of described electric capacity C5；Described resistance R2 mono-termination capacitor C2 and diode D2 connect end and the D-pin of USB input adapter, the D-pin of another termination USB out splice going splice and one end of electric capacity C6；The VSS pin of another termination USB out splice going splice of described electric capacity C6；Described magnetic bead FB1 mono-terminates VSS pin and the diode D3 of USB input adapter, the VSS pin of another termination USB out splice going splice；Described magnetic bead FB2 mono-terminates VBUS pin and the electric capacity D4 of USB input adapter, and another termination capacitor C3 connects end and the VBUS pin of USB out splice going splice with C4's.

5. the electrostatic protection apparatus of USB interface as claimed in claim 4, it is characterized in that: the electrostatic protection apparatus of described USB interface also includes PCB element, static discharge circuit and electrostatic stop that circuit is located on PCB element, described resistance R1, R2 and magnetic bead FB1, FB2 be neat parallel arranged on PCB element, and in this, as the cut-point of ground wire.

6. the electrostatic protection apparatus of USB interface as claimed in claim 5, it is characterized in that: described PCB connects casing ground PGND in resistance R1, R2 and magnetic bead FB1, FB2 wherein one end as boundary with neat parallel arranged, and the other end connects the VSS pin of USB out splice going splice.

7. the electrostatic protection apparatus of the USB interface as described in any one of claim 1-6, it is characterized in that: described USB input adapter is the USB female seat of a standard, there is polytype connecter type, include but not limited to TAPE-A, TAPE-C, MINI-USB and MICOR-USB.