CN201199350Y

CN201199350Y - Serial port static protector

Info

Publication number: CN201199350Y
Application number: CNU2008201019151U
Authority: CN
Inventors: 勾广辉
Original assignee: Fujian Centerm Information Co Ltd
Current assignee: Fujian Centerm Information Co Ltd
Priority date: 2008-04-11
Filing date: 2008-04-11
Publication date: 2009-02-25
Anticipated expiration: 2018-04-11

Abstract

The utility model provides a serial-port electrostatic protector, comprising a female connector for the D type 9-pin data interface, a male connector for the D type 9-pin data interface and transient voltage suppression chips. The transient voltage suppression chips are arranged between the ground wire and eight signal wires of the female and the male connectors for the D type 9-pin data interface. The transient voltage suppression chips are SM12 chips which are respectively connected in series between eight signal wires of the serial-port electrostatic protector and the signal ground. The serial-port electrostatic protector has the advantages of reducing external interference signals of electrostatic, surge and the like produced in the complex working environment, protecting the main board of the end equipment and ensuring more reliable working of the serial ports.

Description

The serial ports electrostatic protector

[technical field]

The utility model is about a kind of computer equipment, is meant a kind of serial ports electrostatic protector especially.

[background technology]

Existing serial ports is designed to the IO rs 232 serial interface signal by common level transferring chip or directly draw rs 232 serial interface signal and realize that to the DB9 at end end or DB25 interface this design meeting causes problems such as serial ports fault in complex operating environment.

In the abominable relatively application scenario of component environment; because signals such as static surge can partly be incorporated into the last equipment of end by serial ports; can cause holding the serial ports of last equipment can't communication; problems such as chip burns on the mainboard that more serious meeting causes with serial ports links to each other are so need design the serial ports electrostatic protector in order to improve this problem.

[summary of the invention]

Technical problem to be solved in the utility model is to provide a kind of serial ports electrostatic protector that strengthens the serial ports protective capability, reduces the damage problem of the last Device Host plate serial ports interlock circuit of end.

The utility model solves the problems of the technologies described above by the following technical programs: a kind of serial ports electrostatic protector; comprise the D type data interface connector female of 9 pins, the D type data interface connector male of 9 pins; and transient voltage suppresses chip, and described transient voltage suppresses between wherein 8 signal wires and ground wire of D type data interface connector male that chip is connected the D type data interface connector female of 9 pins and 9 pins.

This utility model can further be specially:

It is the SM12 chip that described transient voltage suppresses chip, respectively is connected in series a SM12 chip between wherein 8 signal wires of described serial ports electrostatic protector and the signal ground.

The advantage of the utility model serial ports electrostatic protector is: external interference signals such as the static that minimizing produces in complex operating environment, surge, and the motherboard of the last equipment of protection end, the assurance serial ports is worked more reliably.

[description of drawings]

The utility model will be further described in conjunction with the embodiments with reference to the accompanying drawings.

Fig. 1 is the annexation figure of the utility model serial ports electrostatic protector.

Fig. 2 is the internal circuit diagram of the utility model serial ports electrostatic protector.

[embodiment]

Please consult Fig. 1 simultaneously, the utility model serial ports electrostatic protector comprises DB9 (the D type data interface connectors of 9 pins) female 10, DB9 male 20, and the transient voltage that is connected between DB9 female and the DB9 male suppresses chip 30.

Described DB9 female 10 is connected in the serial ports of the last main frame of end, and DB9 male 20 is connected in the serial ports peripheral hardware.

Please consult Fig. 2 simultaneously, among this embodiment, described transient voltage suppresses chip 30 and is made up of 8 chips Q1 to Q8, this chip Q1 to Q8 is special-purpose transient voltage and suppresses chip SM12, SM12 chip maximum peak power is 300 watts, meet IEC 61000-4-2 (ESD) ± 15kV (air), ± 8kV (contact), IEC 61000-4-4 (EFT) 40A (5/50ns) and IEC 61000-4-5 (Lightning) 12A (8/20 μ s) standard, the safety and the reliable transmission of assurance rs 232 serial interface signal line.Wherein respectively be connected in series a SM12 chip between wherein 8 signal wires of this serial ports electrostatic protector and the signal ground.

During use; DB9 female 10 is connected in the serial ports of the last main frame of end; DB9 male 20 is connected in the serial ports peripheral hardware; then be equivalent between 8 signal wires of serial ports and signal ground (SG), respectively be connected in series a SM12 chip; to the protection of being correlated with of 8 signal wires, guarantee the safety and the reliable transmission of rs 232 serial interface signal line.8 signal wires of this serial ports are respectively: 1. carrier wave detect (DCD), 2. receive data (RXD), 3. send data (TXD), 4. DTR (DTR), 5. DSR (DSR), 6. request sends (RTS), 7. clear to send (CTS), 8. ring indication (RI).

Claims

1. serial ports electrostatic protector; it is characterized in that: comprise the D type data interface connector female of 9 pins, the D type data interface connector male of 9 pins; and transient voltage suppresses chip, and described transient voltage suppresses between wherein 8 signal wires and ground wire of D type data interface connector male that chip is connected the D type data interface connector female of 9 pins and 9 pins.

2. serial ports electrostatic protector as claimed in claim 1 is characterized in that: it is the SM12 chip that described transient voltage suppresses chip, respectively is connected in series a SM12 chip between wherein 8 signal wires of described serial ports electrostatic protector and the signal ground.