Soft Switch Dc-dc Converter for Electrolyzer Application
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Transcript of Soft Switch Dc-dc Converter for Electrolyzer Application
SOFT SWITCH DC-DC CONVERTER FOR ELECTROLYZER
APPLICATION
BATCH NO:08
BATCH MEMBER
SUNDARRAJAN S G
GOKULNATH R
MOHAMED ASHIQ A
SATHESKUMAR K
PROJECT GUIDE
Mr. K DINESH M.E,
AP/EEE
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
APPLICATION REQUIREMENTS
• Vin=40v• Vout=60v• Pout=2.4kw• Fs=100kHz• Duty cycle ratio=0.85
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
SOFT SWITCHING CIRCUITS
FIXED FREQUENCY SRC FIG(1)
FIXED FREQUENCY PRC FIG(2)
FIXED FREQUENCY SPRC FIG(3)
LCL SERIES RESONANT DC-TO-DC CONVERTER WITH AN INDUCTIVE OUTPUT FILTER FIG(4)
FIXED-FREQUENCY PHASE-SHIFTED ZVS PWM DC-TO-DC FULL-BRIDGE
CONVERTERFIG (5)
LCL SERIES RESONANT DC-TO-DC CONVERTER WITH AN CAPACITIVE OUTPUT FILTER FIG(6)
ZVT BOOST CONVERTER
OPERATIONAL CIRCUIT
DESIGN VALUE
THEORETICAL EFFICIENCY
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 .
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 );
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.