A Coaxial Noise Standard for the 1 GHz to 12.4 GHz Frequency by William C Daywitt

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By William C Daywitt

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Honsberg, “Green power: status and perspectives,” Proc. IEEE, vol. 89, pp. 1734–1743, December 2001. [11] S. R. Bull, “Renewable energy today and tomorrow,” Proc. IEEE, vol. 89, no. 8, pp. 1216–1226, August 2001. [12] R. Swisher, C. R. D. Azua, and J. Clendenin, “Strong winds on the horizon: wind power comes of age,” Proc. IEEE, vol. 89, pp. 1757–1764, December 2001. [13] N. Hatziargyriou and A. Zervos, “Wind power development in Europe,” Proc. IEEE, vol. 89, pp. 1765–1782, December 2001. [14] J.

2 Power-frequency trends of the devices (from [5]). 108 107 IGCT GTO DEVICE V-I RATINGS PRODUCT (VI) 106 105 IGBT IPM IGBT DISCRETE THYRISTOR 104 103 POWER MOSFET 102 10 10 TRIAC 102 103 104 105 106 SWITCHING FREQUENCY (Hz) The figure (in log-log scale) shows the power-frequency capability of the current devices and their future trends. The power is given by V-I ratings product, that is, the product of 30 Power Electronics and Motor Drives the maximum blocking voltage and maximum turn-off current.

6(b) shows the popular triac light dimmer circuit. The gate of the triac is supplied from an R-C circuit through a diac. A diac is a symmetric voltage-blocking device. The variable resistance R1 controls the dimming level of the lamp, which is connected in series. When the capacitor voltage VC in either polarity exceeds the threshold voltage ±VS of the diac, a pulse of current triggers the triac at a firing angle (af ), giving phase-controlled, fullwave current to the lamp. When the triac is on, the R-C circuit is shorted and the line voltage is impressed across the lamp.

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