YAG Pulse Laser Power Supply For Welding System
150W/300W/600W Operation Manual
Shenzhen Anzhong Power Co., Ltd http://www.szazdq.com
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Chapter
Ⅳ
Principle Introduction
The circuit of the power supply has main components as following:
The main circuit includes:
charging circuit,stored energy circuit,chopped-wave output and
preburning&triggering circuit.
Control Circuit includes:electrical control circuit,computer control circuit and
protective
circuit.
Boost/Rectifying Circuit
Boost/Rectifying Circuit is boosted through three-phase boost system,which consist of boost
inductor and IGBT switch.The voltage is expected to rise from 380VAC to 750VDC,and will provide
the charging circuit with power.
Chopped-wave Output
The IGBT module will stop working when the electric energy of stored energy circuit is fully
charged.After that,IGBT module and storage capacitor will discharge,the charging circuit start
working.The power supply will continue this working mode.
HV Start Circuit
It’s consist of step-up Transformers,HV bridge rectifier,electric filter, current limiting
resistor,current relay,HV pulse transformer and HV triggering circuit.
Since the pulse xenon lamp has entered a state of normal glow discharge when preburning,it
will assume the negative-resistance characteristic.The preburn circuit must be assumed a high
current state to ensure of the normal operation of xenon lamp glow discharge after the end of arc
discharge.So the current limiting resistor of preburn circuit is bigger.The trigger mode of the power
supply is internal trigger.The preburing circuit will trigger automatically,when the storage capacitor is
fully charged,the HV pulse transformer can produce 15000-20000V HV to the xenon lamp,as soon as
preburning succeed,the triggering circuit will cut off by itself.
Control Circuit
There are two primary components that make up a control circuit: operating circuit and
computer controlled circuit.The operating circuit with the interlock protection function,which is by
button,contactor and electric relay to achieve the make-break-operation of pump,preburn
circuit,main power and the control power.The whole computer controlled circuit is assembled on a
circuit board.