Surge protection circuit with failure prediction function

Abstract

The invention provides a surge protection circuit with a failure pre-determining function. The surge protection circuit comprises a first-stage discharging circuit, a second-stage discharging circuit,a base circuit, a sampling and counting circuit, an electric leakage detecting circuit, a central processing circuit and a power supply circuit. Because the technical solution is utilized, the surgeprotection circuit can perform comprehensive evaluation on frequency and strength of the discharging lightning current and the leakage current of a discharging unit, thereby determining whether changing of the discharging unit is required. Furthermore the pre-determining function is realized according to induced surge impact strength (<=10KA,8 / 20us) defied by an international electrician committee. The surge protection circuit realizes a designing concept of no power supply or signal interruption on the condition of impact strength <=10KA and realizes online damaged surge protector change under a precondition of no interruption of the power supply and the signal.

Description

technical field [0001] The invention belongs to the field of surge protection, in particular to a surge protection circuit with a failure prediction function. Background technique [0002] With the development of computer technology, automatic control technology, information technology, and the increasing application of various forms of electronic systems, these systems have been widely used in many industrial sectors and factories with considerable scale and complexity. Due to the work of these electronic system equipment The voltage is only a few volts, and the current is on the order of microamps to milliamperes. Lightning phenomena that are common in nature and complex on-site interference signals can easily cause data loss, damage electronic system equipment, and cause serious accidents such as interruption of the entire control system and shutdown of the factory. Process production is characterized by a continuous and uninterrupted production process. According to the...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the signal and power (series) surge protectors on the market cannot detect their working status online, and a small number of surge protectors only have failure status indication (good / bad)

Problems to be solved: 1. Surge protector products without status indication are used in industrial sites. When they are impacted, they fail and cannot be known, and the protected line signals and equipment are in a dangerous state; 2. The surge protector has been impacted many times. If the circuit is broken due to damage, even if the protected equipment is intact, the signal is interrupted, and indirect losses are inevitable; 3. Surge protector products that do not support online replacement and online self-test will bring high costs and troubles to system maintenance and equipment management ; 4. Even if it has the status indication (good / bad) function, it must wait until the surge protector is damaged, and signal distortion and open circuit are also inevitable

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