Soft Switch Dc-dc Converter for Electrolyzer Application
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Transcript of Soft Switch Dc-dc Converter for Electrolyzer Application
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SOFT SWITCH DC-DC CONVERTER FOR ELECTROLYZER
APPLICATION
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BATCH NO:08
BATCH MEMBER
SUNDARRAJAN S G
GOKULNATH R
MOHAMED ASHIQ A
SATHESKUMAR K
PROJECT GUIDE
Mr. K DINESH M.E,
AP/EEE
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OBJECTIVES
• Switching transition occur under favorable condition-device voltage or current is zero
• Reduce switching loss, switching stress, easy thermal management
• high frequency operation is possible
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APPLICATION REQUIREMENTS
• Vin=40v• Vout=60v• Pout=2.4kw• Fs=100kHz• Duty cycle ratio=0.85
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LITERATURE SURVEY
• R.L.STEIGERWALD- increase the efficiency and further increase the switching frequency while reducing cost, size and electromagnetic interference problem.
• A. K.S BHAT-analysis the LCL type resonant converter in 1994
• A.K.S BHAT-fixed-frequency LCL SRC with an INDUCTIVE output filter, loss of input voltage problem in 1997
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SOFT SWITCHING CIRCUITS
FIXED FREQUENCY SRC FIG(1)
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FIXED FREQUENCY PRC FIG(2)
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FIXED FREQUENCY SPRC FIG(3)
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LCL SERIES RESONANT DC-TO-DC CONVERTER WITH AN INDUCTIVE OUTPUT FILTER FIG(4)
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FIXED-FREQUENCY PHASE-SHIFTED ZVS PWM DC-TO-DC FULL-BRIDGE
CONVERTERFIG (5)
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LCL SERIES RESONANT DC-TO-DC CONVERTER WITH AN CAPACITIVE OUTPUT FILTER FIG(6)
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ZVT BOOST CONVERTER
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OPERATIONAL CIRCUIT
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DESIGN VALUE
THEORETICAL EFFICIENCY
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DESIGN EQUATIONS FOR LCL SRC WITH CAPACITIVEOUTPUT FILTER
Base values:
VB = Vin ,min, ZB = (Lr /Cs )1/2 , IB =VB /ZB .
Converter gain: M = Vo ’/VB , Vo ’ = nt Vo .
NORMALIZED LOAD CURRENT: J = (Id /nt )/IB .
Normalized switching frequency:
F = ωs /ωr = fs /fr , ωr =1/(LrCs )1/2 .
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The values of Lr and Cs are calculated using the following
equations
Lr =(M · J · V B2/Po)(F/2 · π · fs)
Cs =(F · Po/2 · π · fs ·M · J · VB2)
Lr /Lp , the ratio of series resonant inductor Lr to parallel inductor
Lp (= L’t = nt2Lt );
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Then, the transformer turns ratio
nt = (Deff )(Vin )/Vo = 0.567.
The output filter inductor is
Lo =[(Vin/nt ) − Vo ](Deff )/[(ΔId)(2fs )] =∼ 7.5 μH.
The value of Lr is given By
Lr =(ntVin) (1 − Deff )/[(4Id )(fs )]= 0.212 μH.