Thursday, March 27, 2008

Welcome Package for Opto Isolators

New high voltage opto isolators are always a welcome addition to a designers. Optek has a new configuration that you may find handy.

They have axial fiber optic isolators offered in isolation distances from 18mm to 80mm. Providing power electronics engineers with a means to isolate high voltage input/output circuits over varying distances, TT electronics OPTEK Technology has developed a series of axial optical isolators using plastic optical fiber. Designated the OPI1270 Series axial fiber optic isolators, the devices are constructed using a visible red LED emitter and a phototransistor detector in separate opaque molded plastic modules, linked by a shrouded optical cable that shields the optical signal from dust and other contaminations.

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Friday, March 21, 2008

High Voltage Comments

You may noticed a recent change in our high voltage blog. You now have an opportunity to leave a comment on any of the posts. Feel free to indicate what you like/dislike, what you agree/disagree with, or you may submit ideas for future posts. Questions are always welcomed. Of course we expect all comments to be in keeping with the professional nature of the blog.

We look forward to your comments!

Friday, March 14, 2008

High Voltage in the News

Parts were recently stolen from towers carrying 115kV wires. The thieves took hundreds of steel struts, nuts and bolts from three 115kV high voltage towers in Thailand. The 130 foot high towers leaned much more than normal during a windy evening, causing an investigation. The parts were probably taken in order to sell them as scrap metal.

Imagine what would have happened if the towers fell down!


Monday, March 3, 2008

High Voltage Chip Resistors

It's often tough to find good resistors with high enough voltage and resistance ratings. Stackpole has expanded its HVC product line in both areas. Their surface mount resistors are now available up to 10Gohms, and with voltage ratings up to 25kV.

Stackpole claims that their manufacturing process yields resistors with lower noise and better stability.

Other specifications include:
  • Temperature coefficient ratings are as low as 25 ppm per degree C.

  • Tolerance as low as 0.5%

  • Voltage ratings from 5kV to 25kV for chip sizes 0603 to 2512, respectively.