Method for measuring and controlling temp of electrothermal body
A technology of electric heating elements and circuits, applied in temperature control, non-electric variable control, thermometers using electric/magnetic elements that are directly sensitive to heat, etc., can solve broken, low operating level, use safety and reliability discounts, etc. problem, to achieve the effect of simple production and molding process, solution to the problem of temperature measurement and control accuracy, and simplified wiring structure
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[0014] See Figure 1-Figure 4 , This embodiment is mainly composed of electric heating element R L , Main power supply switch K, CPU control circuit, precision power switch, measurement bridge circuit R 1 , R 2 , R 3 , R L , Amplifying circuit A and its peripheral resistance, analog-to-digital conversion circuit ADC, additional functional circuits such as remote control, display, alarm, keyboard and other circuits.
[0015] In the above circuit block diagram, the CPU control circuit sends instructions to the main power supply switch K to apply electric power to the heating element R L Both ends to obtain the required heat energy. At regular intervals, turn off the main power switch K for a short time, turn on the precision power switch, and apply standard power to the heating element R L At both ends, the electrical parameters reflecting the resistance of the electric heating element are obtained by measuring the bridge circuit, and sent to the CPU control circuit for sampling and ...
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