Design of temperature monitoring circuit of mine-used explosion-proof trackless rubber-tyred vehicle

In view of the problem of measurement narrow range and great error of temperature monitoring method for existing mine-used explosion-proof trackless rubber-tyred vehicle, a temperature monitoring circuit of mine-used explosion-proof trackless rubber-tyred vehicle was designed. The thin film platinum resistor was chosen as the sensing element of the circuit, nonlinear bridge sampling circuit and operational amplifier circuit were used to collect weak resistance signals, nonlinear and linear calculation method were used to calculate the resistance value, so as to calculate the temperature of tested unit by resistance value. The actual application shows that the circuit is stable and reliable in running, which provides a stable foundation support of reliable control for mine-used explosion-proof electrical rubber-tyred vehicle.