Friday, September 23, 2011

High Temperatures and Semi-conductors

Great article on high temperature semi-conductor solutions for down-hole applications....

This article discusses the various temperature extremes needed for down-hole applications, and addresses which type of semi-conductors work best for certain conditions.

Monday, September 19, 2011

Sales Seminar - April 2012

Update - The Sales Seminar has been postponed.  We hope to have a firm date by 2012 3Q.  We apologize for any problems this may have caused you. 

Only Seven (7) months until the 2012 Sales Seminar! It will be five (5) years since we were altogether in 2007 and all of us at VMI and CalRamic are looking forward to seeing everyone and a informative exciting time in April.

Location Information

Who: All VMI USA and International Representatives

When: April 12th arrival- April 15th Departures 2012

Where: Visalia Marriott Hotel
Phone: (559) 636-1111 Fax: (559) 636- 2285

Dress: Business casual / Friday evening dinner Business attire

Preliminary Agenda

Arrivals: Thursday April 12, 2012 and Evening Welcome Reception

Friday April 13, 2012
VMI Plant Tour
Sales Meeting
Evening Dinner

Saturday April 14, 2012

Sales Meeting
Saturday afternoon- Activity 
Saturday Evening Dinner

Sunday April 15, 2012 Departures

What we need from All of you

We need your confirmed reservations NO later than March 1, 2012.

To make the Sales Seminar successful VMI and CalRamic need to know what All of you would like information on at the Seminar. Please provide your suggestions on topics to discuss by December 1, 2011 or sooner.

If you have any technical issues you want addressed specifically please let our engineer Daniel Deschenes ( know so he can organize and present the information you want and care about.

VMI and Calramic engineers will be happy to help you with individual questions, but any information or topic you think would help others is appreciated. Our engineers want to help you sell our products with accurate technical information and rapid and precise information. Help us help you!

More information will be provided as we move closer to April 2012.

Thank you!

Wednesday, September 7, 2011

Why Multipliers Do Not Perform Optimally at 50-60Hz

Every once in a while we get a customer inquiry about running voltage multipliers at frequencies of 50-60Hz, which we try to graciously decline, since most of our multipliers are designed to run at 10kHz or higher.

The problem with low frequency multipliers (50Hz – 60Hz) is the slow oscillation at lower frequencies does not charge up the capacitors in the multiplier quickly enough to keep up with normal discharging during the negative cycle.

The reason the voltage multiplier works the way it does is because the capacitors are able to store energy to supply other circuitry down circuit. 

Voltage multipliers work best at 10kHz and higher.   

Sometimes a D.C. input is used, but in order to generate a high D.C. output voltage, the D.C. input has to be converted to an A.C. signal.  This can be done by using a fly-back oscillator or PWM controlling the frequency, and stepping up the signal via a transformer, before being fed into the multiplier.

We normally consider a configuration of this type to be more in line with a power supply, since it incorporates signal conditioning, and a high voltage multiplier.