Pulse width monitoring protection circuit

Abstract

The invention discloses a pulse width monitoring protection circuit which comprises a pulse high-level width monitoring unit, a pulse low-level width monitoring unit and a protection output unit. In the protection output unit, a relay coil is connected in a power supply loop through a controllable switch, and a relay normally-closed contact is connected in series in a signal transmission line of a pulse signal to be detected; the pulse high-level width monitoring unit converts the pulse high-level width of the detected pulse signal into a voltage signal to be output, and outputs a controllable switch driving signal according to the voltage signal; the pulse low-level width monitoring unit is used for converting the pulse low-level width into a voltage signal and outputting the voltage signal, and outputting a controllable switch driving signal according to the voltage signal; when the pulse high level width or the pulse low level width is out of the preset range, the controllable switch is switched on, and the relay normally-closed contact disconnects the signal transmission line. According to the invention, pulse width monitoring can be carried out on the pulse signal for aging excitation, signal transmission is blocked when the pulse signal is abnormal, and the situation that the reliability of the excited circuit is reduced or damaged due to the abnormal pulse signal is avoided.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a pulse width monitoring and protection circuit. Background technique [0002] In the development and production process of integrated circuits, it is often necessary to apply pulse signals to the integrated circuits for burn-in stimulation. During the burn-in process, the output signal of the excitation signal source is often unstable, the pulse width changes, or the excitation source fails, causing the excitation signal to become a fixed high level or low level. These changes can lead to increased power consumption of energized and aged products, greatly reduced product life, or outright damage. Especially for power circuits with large power consumption during operation, abnormal excitation signals can easily lead to rapid heat generation and damage to the product. Contents of the invention [0003] The purpose of the present invention is to provide a pulse widt...

AI Technical Summary

Problems solved by technology

During the aging process, the output signal of the excitation signal source is often unstable, the pulse width changes, or the excitation source fails, causing the excitation signal to become a fixed high level or low level.

These changes can lead to increased power consumption of products that are stimulated and aged, greatly reducing product life, or directly damaging

Especially for power circuits with large power consumption during operation, abnormal excitation signals can easily lead to rapid heat generation and damage to the product

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