Intended use
Summary
3.3 Summary
3.3.1 Brief Introduction
15
Ÿ
STICK
-serires welders are general MMA arc welder which adopts the latest pulse width modulation
(PWM) technology and the insulated gate bipolar transistor (IGBT) power module. It can change work
frequency to medium frequency so as to replace the traditional hulking work frequency transformer with
the cabinet medium frequency transformer. Thus, it is characterized with portable, small size, low
consumption and etc.
Ÿ
STICK
-serires have excellent performances: constant current output makes welding arc more stable;
fast dynamic response speed reduces the impact from the arc length fluctuation to the current;
accurate stepless current adjustment and pre-setting function. There are also some automatic
protection functions for under voltage, over current, over heat, etc. inside the welders, when the
problems listed before occurred, the alarm on the front panel is light and at the same time the output
current will be cut off. It can self-protect and prolong the using life and greatly improved the reliability
and practicability of the welders.
Ÿ
While MMA operation, if the electrode touches workpiece over two seconds, the welding current will
drop to the minimum current automatically to protect the electrode.
Ÿ
MMA——Manual Metal Arc welding;
Ÿ
PWM——Pulse-Width Modulation;
Ÿ
IGBT——Insulation Gate Bipolar Transistor;
3.3.2 Working Principle
The working principle of MINI ARC-serires welder is shown as the following figure. Single phase
220V/230V±10% work frequency (50/60 Hz) AC is rectified into DC (about 300V), then is converted to
medium frequency AC (about 20KHz) by inverter device (IGBT module), after reducing voltage by medium
transformer (the main transformer) and rectified by medium frequency rectifier (fast recovery diodes), and
is outputted by inductance filtering. The circuit adopts current feedback control technology to insure
current output stably. Meanwhile, the welding current parameter can be adjusted continuously and
steplessly to meet with the requirements of welding craft.
Single phase,AC
220/230V 50/60Hz
Rectify
DC
Inverter
AC
Medium
frequency
transformer
Medium
frequency
rectify
Hall device
Current positive
feedback control
DC
DC
AC
