Metallic members joining method and reflow soldering method
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United States of America Patent
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-
Apr 22, 2003
Grant Date -
Oct 11, 2001
app pub date -
Mar 21, 2001
filing date -
Mar 22, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In each odd-numbered unit current-supplying period of a plurality of unit current-supplying periods making up a set current-supplying time, a control unit subjects only positive switching elements to continuous switching operations at an inverter frequency while keeping negative switching elements in an OFF state, whereas in each even-numbered unit current-supplying period, the control unit subjects only the negative switching elements to continuous switching operations while keeping the positive switching elements in an OFF state. This allows a secondary current having a substantially trapezoidal current waveform to flow through a secondary circuit of a power supply apparatus in the positive direction in each odd-numbered unit current-supplying period but in the negative direction in each even-numbered unit current-supplying period. When a current-halting signal is received in the process of such a supply of current, the control unit brings the switching control of an inverter to a halt to interrupt the supply of current at once.
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