Anti-interference singlechip reset circuit

Abstract

The invention discloses an anti-interference singlechip reset circuit. Singlechip resetting is effectively realized through cooperation of a reset circuit and an anti-interference circuit. In addition, in a case where the singlechip is caught in an endless loop, a reset monitoring circuit sends a reset signal to the reset circuit, and the reset circuit receives the reset signal to realize resetting of the singlechip, thus the anti-interference capability and the stability of the reset circuit are greatly improved; and meanwhile, the anti-interference circuit can make a quick response to strong anti-interference singlechip reset circuit within 1ms, and the response action is reliable, and the overcurrent action rate is 100 percent, thus the safety of the reset circuit and the singlechip is effectively ensured, the adaptability is strong, and the anti-interference singlechip reset circuit can be adapted to the overcurrent requirement of any level.

Description

technical field [0001] The invention relates to a protection circuit, in particular to a reset circuit for an anti-jamming single-chip microcomputer. Background technique [0002] Like electronic fences, sewage treatment terminals, etc., these control and monitoring circuits with single-chip microcomputers as the CPU work outdoors for a long time. When disturbed, the program is easy to run away or crash. Make it automatically reset and restore the equipment to normal work; however, when encountering strong electromagnetic pulse interference like lightning, it will cause the single-chip microcomputer to produce a thyristor effect, and then the power supply will suddenly generate a strong current and flow through the single-chip microcomputer. When this happens, the reset circuit of the single-chip microcomputer cannot work, and when it lasts for a long time, the single-chip microcomputer can be burned out due to a large current, which is absolutely not allowed in applications...

AI Technical Summary

Problems solved by technology

[0002] Like electronic fences, sewage treatment terminals, etc., these control and monitoring circuits with single-chip microcomputers as the CPU work outdoors for a long time. When disturbed, the program is easy to run away or crash. Make it automatically reset and restore the equipment to normal work; however, when encountering strong electromagnetic pulse interference like lightning, it will cause the single-chip microcomputer to produce a thyristor effect, and then the power supply will suddenly generate a strong current and flow through the single-chip microcomputer. When this happens, the reset circuit of the single-chip microcomputer cannot work, and if it lasts for a long time, the single-chip microcomputer may be burned out due to the large current, which is absolutely not allowed in applications with high reliability requirements.

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