BEATMORTALITY
Newbie level 2
difference between igbt and regular welder
I am an electronics engineering student and
have recently completed my final semester. I have been trying to study the
designing of an inverter based welder but am stuck at a query which may
sound stupid to you but is of extreme importance to me.
My queries are listed below.
1: In an inverter based welder the IGBTs are switched at above 10 KHz
frequency, if I m right. If I want to design a CONSTANT CURRENT welder
using inverter technology WHAT ARE THE ISSUES THAT I HAVE TO TAKE CARE
OF. I WANT TO KNOW THE ISSUES RELATED TO THE CONTROLLING OF THE PULSES
(IGBT SWITCHING FREQUENCY) AND BASICALLY OTHER ISSUES RELATED TO THE
CONTROL CIRCUITARY.
Let me try to explain what I want to know about. Suppose I am
switching the IGBTs at a frequency of say 20 Khz and the duty-cycle of this
frequency is say 40%. If my welder can produce a maximum output of 400
Amps DC then it means that when there is a load of 400 Amps the IGBTs are
switching at 40% duty cycle (I hope this concept of mine is right). Now
if there is a load of only 100 amps then will my duty cycle reduce??
What is the other information u can give on what do I have to control
in a constant current welder.
Also I want similar information on a CONSTANT VOLTAGE welder. It
would be of great help if you could guide me with these issues
Regards.
I am an electronics engineering student and
have recently completed my final semester. I have been trying to study the
designing of an inverter based welder but am stuck at a query which may
sound stupid to you but is of extreme importance to me.
My queries are listed below.
1: In an inverter based welder the IGBTs are switched at above 10 KHz
frequency, if I m right. If I want to design a CONSTANT CURRENT welder
using inverter technology WHAT ARE THE ISSUES THAT I HAVE TO TAKE CARE
OF. I WANT TO KNOW THE ISSUES RELATED TO THE CONTROLLING OF THE PULSES
(IGBT SWITCHING FREQUENCY) AND BASICALLY OTHER ISSUES RELATED TO THE
CONTROL CIRCUITARY.
Let me try to explain what I want to know about. Suppose I am
switching the IGBTs at a frequency of say 20 Khz and the duty-cycle of this
frequency is say 40%. If my welder can produce a maximum output of 400
Amps DC then it means that when there is a load of 400 Amps the IGBTs are
switching at 40% duty cycle (I hope this concept of mine is right). Now
if there is a load of only 100 amps then will my duty cycle reduce??
What is the other information u can give on what do I have to control
in a constant current welder.
Also I want similar information on a CONSTANT VOLTAGE welder. It
would be of great help if you could guide me with these issues
Regards.