CN215071634U

CN215071634U - Universal USB interface board circuit

Info

Publication number: CN215071634U
Application number: CN202121293653.5U
Authority: CN
Inventors: 梁碧娱
Original assignee: Foshan Shunde Junda Electronic Co Ltd
Current assignee: Foshan Shunde Junda Electronic Co Ltd
Priority date: 2021-06-09
Filing date: 2021-06-09
Publication date: 2021-12-07
Anticipated expiration: 2031-06-09

Abstract

The utility model relates to a general USB interface board circuit, which comprises a USB interface seat, an electrostatic protection module, a filtering module and a short-circuit protection module, wherein the electrostatic protection module, the filtering module and the short-circuit protection module are arranged to avoid the damage to the circuit caused by the instantaneous large current generated by electrostatic discharge; the influence of voltage fluctuation on data transmission is reduced, and the waveform of data transmission is improved, so that the accuracy of data transmission is greatly improved; and when short circuit occurs, the damage of components can not be caused, thereby improving the reliability of the USB interface board circuit.

Description

Universal USB interface board circuit

Technical Field

The utility model relates to a communication interface circuit's technical field, concretely relates to general USB interface board circuit.

Background

With the rapid development of electronic technology in the current society, the application of microprocessors is more and more extensive, and the microprocessors are embedded in the interfaces, so that the functions of the interfaces are more and more abundant, and a plurality of novel communication interfaces also appear, wherein the USB interface becomes one of the current general communication interfaces, and the conventional USB interface is easy to cause signal distortion and even equipment damage due to voltage fluctuation, static electricity, short circuit and the like.

Therefore, further improvements are needed.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome the not enough of above-mentioned prior art existence, and provide a general USB interface board circuit, aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least.

The purpose of the utility model is realized like this:

a universal USB interface board circuit comprises a USB interface seat, an electrostatic protection module, a filtering module and a short-circuit protection module.

The electrostatic protection module comprises an electrostatic impeder ESD and a bidirectional transient suppression diode D1.

The filtering module comprises a capacitor C1 and a resistor R1.

The short-circuit protection module comprises a capacitor C2, an electrolytic capacitor CE, a protection chip and a singlechip.

One end of the electrostatic resistor ESD is connected with the first differential data output end D + of the USB interface seat and then grounded, the other end of the electrostatic resistor ESD is connected with the second differential data output end D-and then grounded, one end of the bidirectional transient suppression diode D1 is connected with a power supply end of the USB interface seat, and the other end of the diode D1 is grounded.

One end of the capacitor C1 and one end of the resistor R1 are respectively connected with a power supply end of the USB interface seat, and the other ends of the capacitor C1 and the resistor R1 are respectively grounded.

The GND pin of the protection chip is grounded, the IN pin of the protection chip is connected with an external power supply, the EN1 and EN2 pins of the protection chip are respectively connected with the signal output end of the single chip microcomputer, the OC1 and OC2 pins of the protection chip are respectively connected with the signal input end of the single chip microcomputer, the OUT1 pin, the OUT2 pin of the protection chip, the anode of the electrolytic capacitor CE and one end of the capacitor C2 are respectively connected with the power supply end of the USB interface seat, and the cathode of the electrolytic capacitor CE and the other end of the capacitor C2 are respectively grounded.

The utility model has the advantages that:

by arranging the electrostatic protection module, the filtering module and the short-circuit protection module, the damage to a circuit caused by instantaneous large current generated by electrostatic discharge is avoided; the influence of voltage fluctuation on data transmission is reduced, and the waveform of data transmission is improved, so that the accuracy of data transmission is greatly improved; and when short circuit occurs, the damage of components can not be caused, thereby improving the reliability of the USB interface board circuit.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, or may be learned by practice of the invention.

Drawings

Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.

Detailed Description

The present invention will be further described with reference to the accompanying drawings and examples.

Referring to fig. 1, the universal USB interface board circuit includes a USB interface base 1, an electrostatic protection module, a filtering module and a short-circuit protection module, and by setting the electrostatic protection module, the filtering module and the short-circuit protection module, the circuit is prevented from being damaged by an instantaneous large current generated by electrostatic discharge; the influence of voltage fluctuation on data transmission is reduced, and the waveform of data transmission is improved, so that the accuracy of data transmission is greatly improved; and when short circuit occurs, the damage of components can not be caused, thereby improving the reliability of the USB interface board circuit.

The filtering module comprises a capacitor C1 and a resistor R1.

The short-circuit protection module comprises a capacitor C2, an electrolytic capacitor CE, a protection chip 2 and a singlechip 3.

One end of the electrostatic impedor ESD is connected with the first differential data output end D + of the USB interface seat 1 and then grounded, and the other end of the electrostatic impedor ESD is connected with the second differential data output end D-and then grounded.

When electrostatic voltage is accumulated between the first differential data output end D + and the second differential data output end D-, the electrostatic voltage can be discharged through the electric impedance device ESD, and the electrostatic protection effect between the first differential data output end D + and the second differential data output end D-is realized.

One end of the bidirectional transient suppression diode D1 is connected with a power supply end of the USB interface socket 1, and the other end of the diode D1 is grounded.

The static voltage accumulated at the power supply end of the USB interface socket 1 can discharge static electricity through the bidirectional transient suppression diode D1, so as to achieve the static protection effect of the power supply end of the USB interface socket 1.

One end of the capacitor C1 and one end of the resistor R1 are respectively connected to the power supply end of the USB interface 1, and the other end of the capacitor C1 and the other end of the resistor R1 are respectively grounded.

The capacitor C1 can filter the voltage of the power supply terminal of the USB interface socket 1, and the resistor R1 ensures that the voltage of the power supply terminal of the USB interface socket 1 is 0 when the protection chip 2 is not outputting to the USB interface socket 1.

The GND pin of the protection chip 2 is grounded, the IN pin of the protection chip 2 is connected with an external power supply, the EN1 and EN2 pins of the protection chip 2 are respectively connected with the signal output end of the single chip microcomputer 3, the OC1 and OC2 pins of the protection chip 2 are respectively connected with the signal input end of the single chip microcomputer 3, the OUT1 pin, the OUT2 pin of the protection chip 2, the anode of the electrolytic capacitor CE and one end of the capacitor C2 are respectively connected with the power supply end of the USB interface seat 1, and the cathode of the electrolytic capacitor CE and the other end of the capacitor C2 are respectively grounded.

In this embodiment, the external power supply means a power supply device having a voltage of 5V.

When the OC1 and OC2 pins of the protection chip 2 detect that the current passing through the protection chip 2 is too large, the current can be fed back to the single chip microcomputer 3 immediately, the single chip microcomputer 3 sends a turn-off signal to the protection chip 2, and the protection chip 2 stops outputting to the power supply end of the USB interface seat 1.

When the OC1 and OC2 pins of the protection chip 2 detect that the current passing through the protection chip 2 is normal, the current can be fed back to the single chip microcomputer 3 immediately, the single chip microcomputer 3 sends an opening signal to the protection chip 2, and the protection chip 2 continuously outputs the power supply end of the USB interface seat 1.

The above embodiments are merely preferred embodiments of the present invention, and other embodiments are also possible. Equivalent modifications or substitutions may be made by those skilled in the art without departing from the spirit of the invention, and such equivalent modifications or substitutions are intended to be included within the scope of the claims set forth herein.

Claims

1. A universal USB interface board circuit is characterized by comprising a USB interface seat (1), an electrostatic protection module, a filtering module and a short-circuit protection module;

the electrostatic protection module comprises an electrostatic resistor ESD and a bidirectional transient suppression diode D1;

the filtering module comprises a capacitor C1 and a resistor R1;

the short-circuit protection module comprises a capacitor C2, an electrolytic capacitor CE, a protection chip (2) and a singlechip (3);

one end of the electrostatic resistor ESD is connected with a first differential data output end D + of the USB interface seat (1) and then grounded, the other end of the electrostatic resistor ESD is connected with a second differential data output end D-and then grounded, one end of the bidirectional transient suppression diode D1 is connected with a power supply end of the USB interface seat (1), and the other end of the diode D1 is grounded;

one end of the capacitor C1 and one end of the resistor R1 are respectively connected with a power supply end of the USB interface seat (1), and the other ends of the capacitor C1 and the resistor R1 are respectively grounded;

the GND pin of the protection chip (2) is grounded, the IN pin of the protection chip (2) is connected with an external power supply, the EN1 and EN2 pins of the protection chip (2) are respectively connected with the signal output end of the single chip microcomputer (3), the OC1 and OC2 pins of the protection chip (2) are respectively connected with the signal input end of the single chip microcomputer (3), the OUT1 pin and OUT2 pin of the protection chip (2), the anode of the electrolytic capacitor CE and one end of the capacitor C2 are respectively connected with the power supply end of the USB interface seat (1), and the cathode of the electrolytic capacitor CE and the other end of the capacitor C2 are respectively grounded.