Lower-than-lower-limit reverse control time base circuit

Abstract

The invention relates to lower-than-lower-limit reverse control time base circuit. All functions of a 555 time base circuit are completely compatible, and new functions are expanded. The technical problem that a conventional master control circuit for higher-than-upper-limit control and lower-than-lower-limit control and a timing circuit are out of control due to failures and cannot timely cut power supplied to a load off to cause potential safety hazards. The technical scheme is that: a lower limit reference circuit, a comparison circuit and a triggering protection circuit are arranged; when a sensing circuit abnormally fails, the inversion of a post-stage circuit is preferably triggered, and a lower-than-lower-limit reverse control protection function is realized to forcibly cut the power supplied to the load off and reliably prevent the failures from causing uncontrollability. When applied to temperature, pressure, water level and timing control circuits, the lower-than-lower-limit reverse control time base circuit can improve the safety performance and avoid serious accidents such as fire when in use. Therefore, the lower-than-lower-limit reverse control time base circuit has high practical value and higher cost performance, and is more widely applied in the fields of electronic application such as small home appliance and simple measurement, timing, control, safety protection and the like.

Description

technical field [0001] The present invention relates to a control circuit / time base circuit, in particular to a time base circuit that ensures that the main control (super upper and lower limit control) or the timing control circuit does not get out of control when the timing control circuit fails. It is applied in temperature, pressure, In water level and timing control electrical appliances, it can improve safety performance and avoid serious accidents (such as fire) during use. Therefore, the present invention has wider applications in electronic application fields such as small household appliances and simple measurement, timing, control, and safety protection, and makes electrical products more cost-effective. Background technique [0002] In order to verify the novelty of the present invention, the designer consulted a large number of relevant technical materials (professional books, newspapers and periodicals), and retrieved relevant patent documents. It is only foun...

AI Technical Summary

Problems solved by technology

[0005] The invention mainly solves the technical problems that the original main control (super upper and lower limit control) circuit and the timing circuit are often out of control due to abnormal faults, the load power supply cannot be cut off in time, and there are potential safety hazards in use; it provides a device that can monitor abnormal faults and has The bottom anti-control protection function prevents the main control circuit from getting out of control, cuts off the load power supply in time, avoids serious accidents (such as fire), and ensures the safe use of the bottom anti-control time base circuit

[0006] The present invention simultaneously solves the technical problems that the reset potential of the reset terminal of the original over-limit control function circuit is improperly set, and the dispersion is too large and the performance is not good; it provides a reset function that doubles as a protection display and a vibration elimination function, reducing the dispersion Sex, improve the performance of the bottom anti-control time base circuit

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