Disclosed in the invention is a dryer
temperature control system based on a high-pass filter and amplification circuit. The
system comprises a single-
chip microcomputer, a
display device, a temperature value pre-storage module, a
signal processing module, a heater CZ, a power supply, an A / D analog-
digital conversion module, and a temperature
inductor, wherein the
display device, the temperature value pre-storage module, the
signal processing module, the heater CZ, the power supply, the A / D analog-
digital conversion module, and the temperature
inductor are connected with the single-
chip microcomputer. The heating unit includes a
synchronous motor, a fan arranged at an end portion of an upper end of a transmission shaft of the
synchronous motor, and the heater CZ arranged at an air outlet of the fan. The
system is characterized in that a high-pass filter and
signal amplification circuit is connected in series between the
signal processing module and the single-
chip microcomputer; and a constant-temperature adjustable
control circuit is connected between the single-chip microcomputer and the heater CZ. According to the invention, the system has the stable performances, so that the temperature stability of the hot-
air dryer can be guaranteed effectively.