Cold shutoff temperature control circuit with TWH9205

Published:2011/8/26 2:14:00 Author:Jessie | Keyword: cold shutoff, temperature control | From:SeekIC

As shown in figure, this circuit is composedofthe zero switch control circuit composedof TW9205 andits peripheral components, SCR drive refrigeration control circuit and sound circuit. The temperature sensor RT in graph uses negative temperature coefficient (NTC) thermal resistor, which is connected to the differential switch amplifier reversed-phase input terminal(pin 9) of TWH9205; Differential switch amplifier phase input terminal(pin 13) and potential clamp fixed end pin 10, 11. Adjust RP1's value so that TWH9205 in set temperature range outputs a low level, and SCR VS in a globe state. When thermistors RT increases to a predetermined value with the temperature, output state of differential switch amplifier is inside the TWH9205, an output terminal of the TWH9205 sents to the high level whenAC powerbecomes zero, SCR VS connected, appliancesget electricity and work.



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