PTC without-water side-thermal mode circuit

Published:2011/5/8 18:43:00 Author:Christina | Keyword: PTC, without-water, side-thermal mode | From:SeekIC

The PTC without-water and over-temperature control side-thermal mode circuit is composed of the detection, control, alarm and other components, the circuit is as shown in figure 1. When there is no water or the water temperature exceeds a set value, RT1's resistance increases and passes to RT2, RT2's resistance also increases after heated, this makes the U1<4V. so ⑤'s output becomes high-level voltage, V conducted and VD2 sends out the red indication, relay K's normally closed contact-point cuts off, and switches off the power immediately, at the same time, the alarm works, BL sends out the voice to achieve the dual purposes of alarm and power off. Figure 1. The PTC without-water and over-temperature control side-thermal mode circuit



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