Patent ID: 6329641
Filing Date: 2001-12-11
Classification: B23K

Abstract:
A device for controlling a soldering iron, comprising:a heating pulse generating portion which generates heating pulses having a zero voltage period exceeding an appointed width;a reference pulse generating portion for generating reference pulses on the basis of said heating pulses;a controlling portion for commencing a temperature controlling action in synchronization of said reference pulses;a heating portion for heating a soldering iron tip upon receiving said heating pulses and for outputting sensor signals corresponding to the temperature of the soldering iron tip;a switching portion, disposed between said heating pulse generating portion and said heating portion, which performs ON and OFF actions on the basis of control signals from said controlling portion; andan amplifying portion for transmitting said sensor signals to said controlling portion upon qualitatively receiving sensor signals from said heating portion;wherein said controlling portion makes a natural number M times the cycle of said reference pulses into a temperature controlling cycle T and controls the temperature of the soldering iron tip by providing heating pulses of a variable number N to said heating portion in the temperature controlling cycle T, andsaid controlling portion picks up sensor signals from said amplifying in said zero voltage period, determines a value of said variable number N on the basis of said sensor signals, and determines an ON-action time of said switching portion corresponding to the determined number N.