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	<title>circuitmaniac.com &#187; Power Electronics</title>
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		<item>
		<title>A comparison of Mosfet and Bipolar Transistor amplifiers</title>
		<link>http://www.circuitmaniac.com/2011/03/16/a-comparison-of-mosfet-and-bipolar-transistor-amplifiers/</link>
		<comments>http://www.circuitmaniac.com/2011/03/16/a-comparison-of-mosfet-and-bipolar-transistor-amplifiers/#comments</comments>
		<pubDate>Wed, 16 Mar 2011 07:38:42 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[MOSFET]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=2312</guid>
		<description><![CDATA[Ever wondered which makes the best &#8211; when it comes to build and amplifier ? A Mosfet or a Bipolar transistor ? Lets go through this article which compares both pros and cons of this dilemma. Most people in general never care about this as long as they get a satisfactory output performance. Lets first [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>Gate Protection in Thyristors</title>
		<link>http://www.circuitmaniac.com/2009/04/17/gate-protection-in-thyristors/</link>
		<comments>http://www.circuitmaniac.com/2009/04/17/gate-protection-in-thyristors/#comments</comments>
		<pubDate>Fri, 17 Apr 2009 20:29:28 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[gate protection]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1644</guid>
		<description><![CDATA[Gate circuit should also be protected against overvoltages and over currents. Overvoltages across the gate circuit can cause false triggering of the SCR. Overcurrent may raise junction temperature beyond specified limit leading to its damage. Protection against over-voltages is achieved by connecting a zener diode ZD across the gate circuit. A resistor R2 connected in [...]]]></description>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Electronic crowbar protection</title>
		<link>http://www.circuitmaniac.com/2009/04/17/electronic-crowbar-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/04/17/electronic-crowbar-protection/#comments</comments>
		<pubDate>Fri, 17 Apr 2009 20:27:22 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[electronic crowbar circuit]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1640</guid>
		<description><![CDATA[As thyristor possesses high surge current capability, it can be used in an electronic crowbar circuit for overcurrent protection of power converters using SCRs. An electronic crowbar protection provides rapid isolation of the power converter before any damage occurs Fig. 4.28 illustrates the basic principle of electronic crowbar protection. A crowbar thyristor is connected across [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>Overcurrent Protection in Thyristors</title>
		<link>http://www.circuitmaniac.com/2009/04/17/overcurrent-protection-in-thyristors/</link>
		<comments>http://www.circuitmaniac.com/2009/04/17/overcurrent-protection-in-thyristors/#comments</comments>
		<pubDate>Fri, 17 Apr 2009 20:24:14 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[over current protection]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1637</guid>
		<description><![CDATA[Thyristors have small thermal time constants. Therefore, if a thyristor is subjected to overcurrent due to faults, short circuits or surge currents ; its junction temperature may exceed the rated value and the device may be damaged. There is thus a need for the overcurrent protection of SCRs. As in other electrical systems, overcurrent protection [...]]]></description>
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		<slash:comments>0</slash:comments>
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		<item>
		<title>Overvoltage Protection in Thyristors</title>
		<link>http://www.circuitmaniac.com/2009/04/17/overvoltage-protection-in-thyristors/</link>
		<comments>http://www.circuitmaniac.com/2009/04/17/overvoltage-protection-in-thyristors/#comments</comments>
		<pubDate>Fri, 17 Apr 2009 20:19:38 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[external overvoltages]]></category>
		<category><![CDATA[Internal over volatges]]></category>
		<category><![CDATA[Overvoltage Protection in Thyristors]]></category>
		<category><![CDATA[suppresion of overvoltages]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1633</guid>
		<description><![CDATA[Thyristors are very sensitive to overvoltages just as other semi-conductor devices are. Overvoltage transients are perhaps the main cause of thyristor failure. Transient overvoltages cause either maloperation of the circuit by unwanted turn-on of a thyristor or permanent damage to the device due to reverse breakdown. A thyristor may be subjected to internal or external [...]]]></description>
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		<slash:comments>3</slash:comments>
		</item>
		<item>
		<title>Design of Snubber Circuits for Thyristor Protection</title>
		<link>http://www.circuitmaniac.com/2009/04/17/design-of-snubber-circuits-for-thyristor-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/04/17/design-of-snubber-circuits-for-thyristor-protection/#comments</comments>
		<pubDate>Fri, 17 Apr 2009 18:45:38 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[snubber circuit]]></category>
		<category><![CDATA[thyristor protection]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1630</guid>
		<description><![CDATA[A snubber circuit consists of a series combination of resistance Rs and capacitance Cs in parallel with the thyristor as shown in Fig. 4.25. Strictly speaking, a capacitor Cs in parallel with the device is sufficient to prevent unwanted dv/dt triggering of the SCR. When switch S is closed, a sudden voltage appears across the [...]]]></description>
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		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>THYRISTOR PROTECTION</title>
		<link>http://www.circuitmaniac.com/2009/04/17/thyristor-protection/</link>
		<comments>http://www.circuitmaniac.com/2009/04/17/thyristor-protection/#comments</comments>
		<pubDate>Fri, 17 Apr 2009 18:20:18 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[di/dt protection]]></category>
		<category><![CDATA[dv/dt protection]]></category>
		<category><![CDATA[thyristor protection]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1628</guid>
		<description><![CDATA[Reliable operation of a thyristor demands that its specified ratings are not exceeded. In practice, a thyristor may be subjected to overvoltages or overcurrents. During SCR turn-on, di/dt may be prohibitively large. There may be false triggering of SCR by high value of dv/dt. A spurious signal across gate-cathode terminals may lead to unwanted turn-on. [...]]]></description>
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		<slash:comments>1</slash:comments>
		</item>
		<item>
		<title>TWO-TRANSISTOR MODEL OF A THYRISTOR</title>
		<link>http://www.circuitmaniac.com/2009/04/14/two-transistor-model-of-a-thyristor/</link>
		<comments>http://www.circuitmaniac.com/2009/04/14/two-transistor-model-of-a-thyristor/#comments</comments>
		<pubDate>Tue, 14 Apr 2009 19:14:32 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[two transistor analogy of a thyristor]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1624</guid>
		<description><![CDATA[The principle of thyristor operation can be explained with the use of its two-transistor model (or two-transistor analogy). Fig. 4.15 (a) shows schematic diagram of a thyristor. From this figure, two-transistor model is obtained by bisecting the two middle layers, along the dotted line, in two separate halves as shown in Fig. 4.15 (b). In [...]]]></description>
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		<slash:comments>0</slash:comments>
		</item>
		<item>
		<title>THYRISTOR GATE CHARACTERISTICS</title>
		<link>http://www.circuitmaniac.com/2009/04/13/thyristor-gate-characteristics/</link>
		<comments>http://www.circuitmaniac.com/2009/04/13/thyristor-gate-characteristics/#comments</comments>
		<pubDate>Mon, 13 Apr 2009 21:19:47 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>
		<category><![CDATA[thyristor gate characteristics]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1617</guid>
		<description><![CDATA[The forward gate characteristics of a thyristor are shown in Fig. 4.9 in the form of a graph between gate voltage and gate current. Here positive gate to cathode voltage Vg and positive gate to cathode current Ig represent dc values. As gate-cathode circuit of a thyristor is a p-n junction, gate characteristics of the [...]]]></description>
		<wfw:commentRss>http://www.circuitmaniac.com/2009/04/13/thyristor-gate-characteristics/feed/</wfw:commentRss>
		<slash:comments>4</slash:comments>
		</item>
		<item>
		<title>SWITCHING CHARACTERISTICS OF THYRISTORS DURING TURN OFF</title>
		<link>http://www.circuitmaniac.com/2009/04/09/switching-characteristics-of-thyristors-during-turn-off/</link>
		<comments>http://www.circuitmaniac.com/2009/04/09/switching-characteristics-of-thyristors-during-turn-off/#comments</comments>
		<pubDate>Thu, 09 Apr 2009 19:50:33 +0000</pubDate>
		<dc:creator>John</dc:creator>
				<category><![CDATA[Power Electronics]]></category>
		<category><![CDATA[Thyristor]]></category>

		<guid isPermaLink="false">http://electricalandelectronics.org/?p=1610</guid>
		<description><![CDATA[Static and switching characteristics of thyristors are always taken into consideration for economical and reliable design of converter equipment. Static characteristics of a thyristor have already been examined. In this part of the section; switching, dynamic or transient, characteristics of thyristors are discussed. During turn-on and turn-off processes, a thyristor is subjected to different voltages [...]]]></description>
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		<slash:comments>0</slash:comments>
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