http://electricalandelectronics.org Mon, 21 Nov 2011 06:09:11 +0000 en hourly 1 http://wordpress.org/?v=3.3.1 http://electricalandelectronics.org/2008/09/28/power-transistor/ http://electricalandelectronics.org/2008/09/28/power-transistor/#comments Sun, 28 Sep 2008 15:10:33 +0000 arjun http://electricalandelectronics.org/?p=447 Power transistors are finding increasing popularity in low to medium power applications.A power transistor has low current gain and requires continuous base drive during on-state conditions but doesn’t require forced commutations.Circuitry power transistors can be used in high switching frequency,permitting size reduction of electromagnetic components and can provide current limit protection by base drive circuit.Power transistor cannot withstand reverse voltage and application is limited to dc voltage for inverters and choppers. A transistor is a three layer pnp or npn semiconductor device having two junctions.This type of transistors is know as bipolar junction transistor(BJT).The structure and symbol of npn transistor is shown below. The three terminals of the device are read more

]]> Power transistors are finding increasing popularity in low to medium power applications.A power transistor has low current gain and requires continuous base drive during on-state conditions but doesn’t require forced commutations.Circuitry power transistors can be used in high switching frequency,permitting size reduction of electromagnetic components and can provide current limit protection by base drive circuit.Power transistor cannot withstand reverse voltage and application is limited to dc voltage for inverters and choppers. A transistor is a three layer pnp or npn semiconductor device having two junctions.This type of transistors is know as bipolar junction transistor(BJT).The structure and symbol of npn transistor is shown below. The three terminals of the device are read more

]]> http://electricalandelectronics.org/2008/09/28/power-transistor/feed/ 0