Over-temperature protection device of program-controlled temperature control system

Abstract

The invention discloses an over-temperature protection device of a program-controlled temperature control system, which comprises a single-chip microcomputer, a digital temperature sensor, a heating driver and a heater, wherein the heating driver is electrically connected with the heater, an enabling end of the heating driver is mutually electrically connected with a trigger output end of the digital temperature sensor, and a control input end of the heating driver is electrically connected with an IO control port of the single-chip microcomputer; the over-temperature threshold is written intothe digital temperature sensor by the single-chip microcomputer or other digital controllers through a data bus, the level changes at one output port when the temperature measurement result of the digital temperature sensor exceeds the preset temperature threshold, the output port is connected with an enabling port of the heating driver, and the output of the heating driver is automatically closed when the level of the output port changes, so that the temperature of the heater is controlled to be always below the set threshold temperature, and the over-temperature protection for a heated object is realized.

Description

technical field [0001] The invention belongs to the technical field of over-temperature protection equipment, and in particular relates to an over-temperature protection device of a program-controlled temperature control system. Background technique [0002] Heater temperature control is widely used in various industries. However, the safety of the heater has also received attention. According to traditional safety regulations, the heater should not experience uncontrolled temperature rises or even fires under a single fault of any device. The traditional solution is mainly to heat A temperature switch is connected in series in the power supply circuit of the heater to detect the temperature of the heater, and when the temperature of the heater reaches a certain limit value, the power supply of the heater is disconnected. There are two types of temperature switches, one is self-recovery and the other is non-self-recovery. The traditional programmable temperature control sys...

AI Technical Summary

Problems solved by technology

However, when the microcontroller or other digital controllers have a hardware or software failure, the heating driver is out of control. If the heater is in the power supply heating state at this time, the temperature of the heater will continue to rise, resulting in overheating and damage to the heated object. even cause a fire

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