Volume : I, Issue : VI, March - 2012

A Noval Switch Mode Power Supply for Flash Lamp Pumped Nd: Yag Laser

Kireet Semwal, S. C. Bhatt

Abstract :

Nd: YAG laser is pumped by a simple & compact 12 V to 600 V, DC–DC Switch Mode Power Supply using Fly–Back Topology. This power supply is capable of charging 270 µF capacitor at 600 V and discharge at the rate of 5 pps. Which generates 50 Joules 10 W energy at 100 kHz. It also generates a 20 KV trigger pulse employing to trigger laser flash lamp.The major components of a power supply employed in a flash lamp pumped laser are a charging unit, a pulse–forming network, and a flash lamp trigger circuit. Transistor 2N3055 is used as a switching element, and IC SG3524 is used as a pulse–width–modulator. A feature of this power supply is the fact that the repetition rate of the DC–DC converter progressively increases from 1kHz to about 100 kHz during the charge cycle in order to keep the peak–to–peak rms current drawn from the battery at a low value. This is achieved by a current–sensing network which feeds a signal to the logic circuit, which in turn controls the switching frequency of the transistors in the DC–to–AC inverter. At full capacitor charge a voltage sensor turns off the driving signals to the transistors. The switching transistor is turned on for a short period of time to allow current flow in the primary of the inductor. When the transistor is turned off, the magnetic energy stored in the inductor is transferred to the energy storage capacitor; at the same time the voltage is stepped up from 12 V to approximately 600 V. The trigger circuit consists a trigger transformer with a capacitor and a SCR in the primary. When the capacitor is discharged, a high voltage of 20 kV is generated at the secondary, which eaks down the lamp.

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Article: Download PDF   DOI : 10.36106/ijar  

Cite This Article:

Kireet Semwal, S. C. Bhatt A Noval Switch Mode Power Supply for Flash Lamp Pumped Nd: Yag Laser Indian Journal of Applied Research, Vol.I, Issue.VI March 2012

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