Weather indicator. Drawing, description

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Weather indicator. Tips for the home master

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It is known that under the action of moisture, flat sheets of paper or cardboard expand somewhat and begin to warp. This quality of them can be used to make at home the simplest device, understandable from the figure.

weather indicator

A strip of kraft paper (usually used for packing goods) attached to a rack is connected to an arrow pointing to a graduation marked out from your previous observations.

With a change in air humidity, the strip will pull the arrow up - "clear" or lower it down - "rain".

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IGBT modules with a total lead inductance of 15 nH 30.11.2009

SEMIKRON has introduced the latest generation of low inductance 1200 V SEMITRANS IGBT modules designed for use in 20...300 kW converters. Now these modules will be equipped with V-IGBT (Fuji) chips, similar in their characteristics to Trench 4 crystals.

The new IGBTs feature smoother switching characteristics and lower dynamic losses to improve conversion efficiency. V-IGBT crystals will be installed in three module sizes in three different configurations, designed for use in eight power ranges. The operating current range of the power switches is 150...600 A. The total inductance of SEMITRANS 3 and 4 outputs is reduced to 15 nH.

With a typical IGBT switching speed of 5000 A/µs, the amplitude of switching surges is only 75 V. For power switches of the same class available on the market, this value is in the range of 90...125 V. The new modules will be produced in basic configurations, necessary for the design of industrial converters: single keys, half-bridges and choppers. The insulation voltage of the components of the new SEMITRANS family is 4000 V, they are equipped with 4 types of IGBT crystals: IGBT2, IGBT2 fast, IGBT3, IGBT4.

SEMITRANS modules have 3 operating voltage classes: 600 V, 1200 V and 1700 V, they are produced in 3 standard sizes of housings of 34 mm and 62 mm standards. Also available are 6 key SEMITRANS 6 according to the 3-phase inverter scheme, SEMITRANS 5 for building a 3-level inverter with an integrated current shunt. A SEMITRANS 9 with an isolation voltage of 9 kV for railway applications is under development.

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