Surge protection circuit for lightning protection of acquisition system

• Main Authors: WANG XINGLE, HE YING'ER, WANG XING'AN, WANG SHUN'AN, WANG SHENBIAO
• Format: Patent
• Language: Chinese; English
• Published: 01.02.2022
• Subjects: CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS; GENERATION

The utility model relates to the field of protection circuits, in particular to a surge protection circuit for lightning protection of an acquisition system, which is provided with a transient suppression diode and is characterized by further comprising a ceramic gas discharge tube and a resettable fuse, the ceramic gas discharge tube is connected in parallel between a TXD interface and an RXD interface of the protection circuit, and the resettable fuse is connected in parallel between the TXD interface and the RXD interface. The resettable fuse is connected with the ceramic gas discharge tube to eliminate parasitic coupling generated by current change. The surge protection circuit has the advantages that the ceramic gas discharge tube is used for absorbing first-stage large current, most surge current is absorbed, residual voltage flows to the transient suppression diode to obtain low clamping voltage after decoupling processing of the self-recovery fuse, and the RS232 chip is protected from being affected b