Temperature switch

Abstract

The invention discloses a temperature switch, comprising a threshold temperature setting module for output a digit signal to a basic temperature switch module, to adjust the effective width-length ration of a MOS tube in the temperature switch module for controlling the threshold temperature, to set the threshold temperature in the basic temperature switch module, an art error compensation module for providing an error compensation signal to the basic temperature switch module when the threshold temperature of the basic temperature switch module is deflected, to stabilize the threshold temperature in the basic temperature switch module, and a basic temperature switch module for changing the working state of circuit when the temperature reaches threshold temperature, to realize temperature switch function. The invention can realize the programmable control of switch temperature threshold value, thereby reducing the bias of temperature threshold value, and avoid the delay of temperature threshold value.

Description

technical field [0001] The invention relates to the technical field of temperature switches used for temperature detection and control, in particular to a programmable temperature switch with process error compensation function. Background technique [0002] Temperature switches are widely used in modern household appliances, motors, chips and other technical fields for temperature detection and temperature control. Traditional temperature switches are generally made of temperature-sensitive materials, such as memory alloys. With the development of microelectronics technology, a temperature switch made by integrated circuit technology has appeared, which has the advantages of small size and low cost. [0003] In principle, the temperature switch of the currently applied integrated device first generates a current or voltage proportional to the absolute temperature (PTAT), and then compares it with a reference voltage or current through a comparison circuit. When the tempera...

AI Technical Summary

Problems solved by technology

[0006] 1. The switch temperature threshold cannot be controlled by programming

[0007] 2. The switching temperature threshold varies with the device parameter V TH0 Almost linear change, in the normal range of device parameter variation, the temperature threshold may deviate from tens of degrees

[0008] 3. The hysteresis of the temperature threshold is too large and cannot be adjusted

[0009] Due to the above three shortcomings, this kind of temperature switch is currently not practical

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