Thursday, November 29, 2012

Different Kinds of "High Voltage"


High Voltage!


Those words mean different things to different people in different industries.

In electric power transmission, high voltage is 35kV and above. In the U.S., the National Electrical Code (NEC) defines high voltage as anything over 600V.

In the digital world, a logical "1" high voltage can be a low as 3.3V, or even 1.8V. Older systems defined logical “1” as 5V, which really meant anything above 4.5V - many years ago.

International Danger-High-Voltage Sign

At VMI, high voltage means 1,000V or higher. In reality, 1kV is actually kind of on the low side of ‘high voltage’ around here when you consider that our diodes start out at 2kV reverse voltage (Vrwm).

Some of the rectifier assemblies – high voltage stacks and single-phase bridges – start at 2kV and go up to 45kV (per leg).

Highest of the high voltage is our power supply line. A 50kV, 10W output is the highest standard power supply VMI currently makes. Power supply design has lore all its own – as does rectifier assembly design, multiplier design, and anything at all to do with high voltage.

One thing we know is it pays to have respect for high voltage. It is truly an amazing natural phenomenon (think lightning). Maybe one day I will research that topic.

Teaser: Did you know that lightening could have a positive or negative charge?  Me neither. You learn all kinds of interesting things when researching a blog post.



References

Health and Safety Fact Sheet:  High Voltage (>1000 Volts) Electrical Safety and Injuries, (2009). Energy Recovery Council. http://www.energyrecoverycouncil.org/userfiles/file/ERC_FactSheet_Electric_injury_final.pdf, retrieved 11/29/2012.

High Voltage. http://en.wikipedia.org/wiki/High_voltage, retrieved 11/29/2012.

High Voltage Warning. http://en.wikipedia.org/wiki/File:High_voltage_warning.svg, retrieved 11/29/2012.

Tuesday, November 20, 2012

More of "Happy Employees"

I have worked for Voltage Multipliers Inc. now for over 22 years, and am pleased to say that every year, in celebration of Thanksgiving, and in appreciation of all we have to be thankful for, VMI gives each employee (full time, part time, and temporary) a Thanksgiving turkey.

They are being delivered today.

And we are thankful.  For everything.

Thank you Dennis, John, and Ken.

Happy Thanksgiving, y'all!

 

Friday, November 9, 2012

Happy Work Force - The Start of Year 33

One of the great things about working at VMI is the fact that we all share in our successes.

Today VMI is providing lunch - to celebrate the start of 33 years in business - for all it's employees.

You know it's a good place to be when the first employee ever hired still works here.  A low turn-over rate means a lot of accumulated knowledge.

It's amazing how much goodwill can be generated with pizza, soda, and an extended lunch hour.

VMI opened it's doors on November 10, 1980.  Back then, voltage multipliers was the sole product line.

Over the last 32 years, VMI has expanded their offerings to include high voltage diodes, rectifiers, opto-couplers, power supplies, hybrid multipliers, and all kinds of other things.

We're really good at problem-solving too, so if you have a high voltage dilemma, call us.

Onward, and upward!