Patent ID: 6423950
Filing Date: 2002-07-23
Classification: B23K

Abstract:
A reflow soldering apparatus comprising:a heater tip for generating heat by current supply; pressing means for pressing a point of said heater tip against sites to be soldered, for pressing over a predetermined pressing time; a rectifying circuit for rectifying an AC voltage of a commercial frequency into a DC voltage; an inverter for converting the DC voltage output from said rectifying circuit into a pulsed voltage of a high frequency; a transformer having primary side terminals electrically connected to output terminals of said inverter, said transformer having secondary side terminals electrically connected to terminals of said heater tip without intervention of any rectifying circuit; and inverter control means for segmenting a current-supplying time defined in said predetermined pressing time into a plurality of current-supplying periods, said inverter control means providing a control of switching operations of said inverter such that in odd-numbered current-supplying periods said inverter issues said high-frequency pulse with one polarity and such that in even-numbered current-supplying periods said inverter issues said high-frequency pulse with the other polarity.