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Laser High Voltage Supply

IP.com Disclosure Number: IPCOM000052772D
Original Publication Date: 1981-Jul-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Roalson, HJ: AUTHOR

Abstract

An improved laser high voltage power supply is shown and described in which the high level starting voltage is generated from one stage of the supply without excessive loading of the high current stage of the power supply.

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Laser High Voltage Supply

An improved laser high voltage power supply is shown and described in which the high level starting voltage is generated from one stage of the supply without excessive loading of the high current stage of the power supply.

The start voltage of a laser 1 is typically about three times the run voltage. The typical way to generate this start voltage is to stack two additional multiplier stages 12,14 on top of the first stage 10, as shown in the drawing. The output is taken directly from the top of the last stage at terminal 16. The capacitor values C3 through C6 of the second and third stages 12,14 are much smaller than the first stage 10 capacitors C1 and C2. When the supply is turned on, the laser does not draw current initially, so the output voltage charges up to a value approaching three times the peak-to-peak voltage of the transformer secondary
20. When the voltage is sufficient to fire the laser, current flows and the output voltage drops. With current flowing, the two low capacitance stages 12, 14 collapse and diodes CR3 through CR6 conduct nearly continuously and the first stage 10 provides all the drive. In this condition capacitor C3 shunts diode CR2, making the first stage very inefficient.

The improved circuit eliminates the problem described above by deriving the start voltage from the third stage 14 through an RC filter (RS, CO) and the run voltage/current from the first stage 10 through diodes CR7 and CR8. This operation pr...