High-precision temperature control circuit with DAC constant current circuit

The invention relates to a temperature control circuit which belongs to the laser equipment field and particularly relates to a high-precision temperature control circuit with a DAC constant current circuit. The high-precision temperature control circuit comprises an NTC temperature measuring circuit, a single chip microcomputer and a laser device, wherein the NTC temperature measuring circuit isconnected with the laser device and is used for measuring the temperature of the laser device and sending the data to the single chip microcomputer; the single chip microcomputer is used for receivingthe temperature data measured by the NTC temperature measuring circuit and controlling a TEC thermal energy converter to work through an H bridge circuit and a DAC constant current circuit; and the laser device is connected with the TEC thermal energy converter. Therefore, the high-precision temperature control circuit has the advantages that the power fluctuation is relatively small when the output power stability requir