Temperature pulse width conversion circuit principle

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As shown in the figure is a temperature/pulse width conversion circuit composed of a voltage comparator, a thermal sensing element, and a 555 monostable delay circuit. A voltage comparator is formed by an operational amplifier to control the magnitude of the voltage output. The temperature is transferred by the heat sensitive component and the 555 is time controlled to form a temperature/pulse width conversion circuit. In the figure, the op amp is formed into a voltage comparator using FOO7, and the inverting terminal of the op amp is connected to R6C2 to form a loop. The positive phase is terminated with a thermistor. When the temperature rises, the potential at point A decreases. When the potential at point A falls to the charged voltage of the capacitor, the overall operation of the op amp is low, 555 is set high, and VT1 is turned on. Capacitor C2 discharges quickly. The transient stability time T is the high level of the 555 delay circuit output time t=1.1×R6×C2, and the ambient temperature determines the low level time t of the 555 output. The temperature is inversely proportional to the time. The higher the ambient temperature, the higher the voltage. small.