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Unformatted text preview: PhaseControlled Bridge, 60 α As α is increased to a value greater than 60 , the instantaneous load voltage becomes negative in parts of the cycle. If there is no freewheeling diode, Equation for average voltage still applies. 0.955 cos d ml V V α = 7 Only in the case of a freewheeling diode does the average voltage equation change from to accommodate the interval during which the instantaneous load voltage is zero. The graph in Figure shows waveforms for 90 α = Average load voltage is found in a manner similar to the previous cases. The upper limit for the integration is π . ( 29 3 6 2 3 3 sin 1 cos V ml d ml V V d π π π π π α ϑ ϑ α + = = + + ∫ . Bridge and FWD Current 8 If 60 α and there is an FWD, the FWD conducts the load current for the angle ( 60 ) α twice in each 120 0 interval. The SCR thus conducts for the interval 120 2( 60 ) (240 2 ) α α  = ....
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This note was uploaded on 10/05/2011 for the course EECS 101 taught by Professor Hero during the Spring '11 term at National Taipei University.
 Spring '11
 Hero
 Volt

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