485 port hot plug protecting circuit

• Main Authors: ZHAO QUN, TIAN HAILIN, JIN ENXIANG, JIN JIANYUN, XI ZHONGHUA, YAO CHEN, YAN YONGFANG, WANG KAIWU, LI HONGXIA, XU JIAN, WANG QIUYUN, ZHOU CHUNHONG, HOU HAIPING, ZHENG WEIMIN
• Format: Patent
• Language: Chinese; English
• Published: 05.02.2014
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The invention relates to a 485 port hot plug protecting circuit, in particular to a 485 bus hot plug protecting circuit, and provides a protecting circuit capable of achieving hot plug of a 486 bus. According to the technical scheme, the hot plug protecting circuit comprises a plug, a power supply and port protecting circuit, an electronic switch circuit, a power supply ground detecting circuit and a port chip and control circuit, wherein the plug is connected with the power supply and port protecting circuit, the positive electrode output end of the power supply and port protecting circuit is connected with the positive electrode input end a1 of the electronic switch circuit, the negative electrode output end of the power supply and port protecting circuit is connected with the negative electrode input end of the port chip and control circuit, and a signal pin 485A and a signal pin 485B of the power supply and port protecting circuit are connected with a signal pin 485A and a signal pin 485B of the port chip