Posted on Dec 21, 2012

Ql and Q2 switch the primary windings of transformer Tl via a square wave at a frequency determined by its magnetic properties. Diodes Dl and D2 provide base return paths for the feedback current of Ql and Q2. The output winding of T1 is connected to a multiple section voltage multiplier. That multiplier consists of capacitors Cl through C5 and diodes D3 through D6. Resistors R3 and R4 divide the 800 V taken off at the junction of C3, and C5 for charging the dump capacitor C9 in the ignitor circuit.

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The ignitor, consisting of the T2 pulse transformer and capacitor discharge circuitry, provides the high-voltage de pulse to ignite the laser the SCRl dumping the energy of capacitor C9 into the primary of T2. The high-voltage pulses in capacitor Cll through rectifier diode D9. When Cll is charged to a LTl, ignition takes place and a current now flows that is sufficient to sustain itself at the lower voltage output of the voltage multiplier section. The path for this sustaining current is through the secondary of T2 and ballast resistors Rll and Rl2. The ignitor circuit is now deactivated by the clamping of Q3 emitter via Q4 being turned on by the voltage drop occurring across Rl0. This voltage drop will only occur when the laser tube is ignited and causes the SCRl to cease firing; otherwise, the ignitor circuit would continue to operate, unnecessarily drawing on the limited power available.

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