Electric control and temperature control switch circuit

Abstract

The invention discloses an electric control and temperature control switch circuit, which comprises a temperature sensor, a filter circuit and a comparison circuit, namely a hysteresis comparator. A filtered voltage signal is connected to a positive phase voltage input end of a pin 1 of the hysteresis comparator; an inverse phase voltage input end of a pin 2 of the hysteresis comparator is connected to a reference voltage output end of a pin 7 to input reference voltage VREF; a cathode threshold voltage input end of a pin 5 is connected to the inverse phase voltage input end of the pin 2; the reference voltage output end of the pin 7 is connected to the ground through a resistor R2 and a resistor R3 in sequence; an anode threshold voltage V1H input end of a pin 6 is connected to a connection place of the resistor R2 and the resistor R3; and a power voltage VCC input end of a pin 8 is connected to a signal output end of a pin 4 through a pull-up resistor R4. According to the switch circuit, a signal of a temperature sensor can be converted to a voltage signal to output along with the change of the device temperature, so that the circuit can complete on-off control on a subordinate circuit at one temperature.

Description

technical field [0001] The invention relates to a switch circuit, in particular to an electronically controlled temperature control switch circuit, which is suitable for the automotive field and needs to automatically control the on-off of the circuit through the temperature limit. Background technique [0002] In a low-temperature or high-temperature environment, some components on the vehicle are prone to damage due to temperature problems, so temperature control is required to complete the protection of these components. However, the current temperature control method mainly realizes circuit control through the physical deformation characteristics of specific metals at different temperatures. This method has defects such as large control temperature errors, unstable reliability and consistency of temperature switching devices, and the like. Contents of the invention [0003] In order to overcome the deficiencies of the above technologies, the present invention provides ...

AI Technical Summary

Problems solved by technology

However, the current temperature control method mainly realizes circuit control through the physical deformation characteristics of specific metals at different temperatures. This method has defects such as large control temperature error, unstable reliability and consistency of temperature switching devices, etc.

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