Arc striking pulse peak current control electric welding machine and control method thereof
A peak current control and peak current technology, which is applied in arc welding equipment, manufacturing tools, welding equipment, etc., can solve problems affecting the safety of power supply equipment, overcurrent impact, and easy damage, so as to eliminate the sticking phenomenon of welding rods and reduce Inrush current and the effect of eliminating overshoot current
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[0037] circuit such as figure 2 As shown, it is a voltage type PWM control circuit type.
[0038] The analysis is as follows: Phase 1: (unloaded)
[0039] There is no welding current at no-load, the given welding current and thrust current are positive values and sent to the regulator U1, U1 outputs the minimum value at this time, Q1 is turned off, U3 (3525) is a voltage-type pulse width modulation integrated circuit, the ninth The pin voltage determines the output pulse width, and drives the power switch device to achieve adjustable output power. The 9th pin is the maximum value of the output at this time!
[0040] The current sampling circuit does not send a signal to U2 to form a current threshold comparison circuit, U2 outputs a low level, R13 will pull down the potential of the 9th pin of U3 (3525) (ie point A) through D1, and adjust the voltage of R13 and U3 pin 9 Clamped at the voltage value with the smallest output pulse width. Generally, the no-load output pulse...
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