Abstract: The electric block diagram
of newly developed pulse width modulated inverting arc welding
power source is given in this paper after the necessity of
developing transistor-inverter arc welding power source has been
briefly clarified. The principle of this power source is
analyzed from view-point of obtaining constant-current
characteristic. Secondly, theoretical analyses are made to
select inverting frequency. And the formula of reactance of
output reactor is derived from calculating the dynamic process
of welding current. Finally, based on the equivalent circuit of
high-frequency transformer, the current variation under the
action of rectangular pulse sequence voltage is analyzed. The
cause and harmfulness of magnetic biasing phenomenon of
high-frequency transformer are also discussed.
Key words:
Inverter arc welding power source Mathematic analysis
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