Patent ID: 8330084
Filing Date: 2012-12-11
Classification: H05B

Abstract:
1. A temperature-control method for a temperature-control circuit of a heating line, where the heating line comprises a heating wire, a sensing line, an insulation-and-meltable layer located between the heating wire and the sensing line, and a cladding layer covering the outer peripheries of the sensing line and the insulation-and-meltable layer; one end of the heating wire is coupled with one polarity of power while another end thereof is connected with a switch that is coupled with a reverse polarity of the power; and the temperature-control circuit is respectively connected with the sensing line and the switch; the temperature-control method for the temperature-control circuit comprising steps of: a. outputting a first forward square-wave signal by a first forward square-wave signal generation circuit; b. inputting the first forward square-wave signal into a first input end of an AND gate; after charging and discharging the split-flow of the first forward square-wave signal, comparing it with an adjusted voltage; after above comparison, outputting a reverse square-wave to a second input end of the AND gate; c. comparing the signal passing through the sensing line by a second voltage comparator and outputting a second forward square-wave signal to a third input end of the AND gate; and d. triggering the switch by a trigger circuit and rendering the switch in conducting state so as to heat the heating wire when the three input ends of the AND gate have logic-high input simultaneously; stopping triggering the switch and stopping the heating of the heating wire when the second forward square-wave signal output by the second voltage comparator is moved by the rising temperature and the three input ends of the AND gate have logic-high input non-simultaneously.