need help for a modified SMPS

Thread Starter

Mohamed Mahmoudi

Joined Apr 16, 2019
4
i built the following modified SMPS to generate a current amplification in the tank circuit L3 / C2 , using the main voltage is an advantage for good reactive current in L3 but the transistor BU508 run very hot, i burn 3 of them , i need a technical help about what's going on and the best way to handle such circuit , in the attachment the simulation circuit show a huge gain in reactive current , also the file of LTSPICE simulator. thanks in advance .
 

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Thread Starter

Mohamed Mahmoudi

Joined Apr 16, 2019
4
here you are :

.model BU508 NPN(Is=148.5p Xti=3 Eg=1.11 Vaf=100 Bf=30 Ise=1.355n Ne=1.413 Ikf=8.245 Nk=.8069 Xtb=1.75 Br=2.131 Isc=529.1p Nc=1.567 Ikr=1.689 Rc=32.64m Cjc=303.6p Mjc=.3333 Vjc=.5 Fc=.5 Cje=910.8p Mje=.3333 Vje=.5 Tr=16.1u Tf=22.02n Itf=183.6 Xtf=18.91K Vtf=10 Vceo=1500 Icrating=8 mfg=TFK)
.model BU508A NPN(Is=148.5p Xti=3 Eg=1.11 Vaf=100 Bf=43.23 Ise=1.355n Ne=1.413 Ikf=8.245 Nk=.8069 Xtb=1.75 Br=2.131 Isc=529.1p Nc=1.567 Ikr=1.689 Rc=32.64m Cjc=303.6p Mjc=.3333 Vjc=.5 Fc=.5 Cje=910.8p Mje=.3333 Vje=.5 Tr=16.1u Tf=22.02n Itf=183.6 Xtf=18.91K Vtf=10 Vceo=1500 Icrating=8 mfg=TFK)
.model BU508DR NPN(Is=85.92p Xti=3 Eg=1.11 Vaf=100 Bf=43.48K Ise=18.19u Ne=2.9 Ikf=1.639 Nk=.8151 Xtb=1.5 Br=11.84 Isc=5.251n Nc=1.556 Ikr=1.229 Rc=7.009m Cjc=303.6p Mjc=.3333 Vjc=.5 Fc=.5 Cje=910.6p Mje=.3333 Vje=.5 Tr=5.692u Tf=21.03n Itf=9.956 Xtf=231.8 Vtf=10 Vceo=1500 Icrating=8 mfg=TFK)
 

ericgibbs

Joined Jan 29, 2010
11,179
Hi,
I managed to place the BU508 model from your Wiki link into my standard.bjt.
I am now searching for the RFN2LAMs model.
Sorry about this problem.
E
 

Thread Starter

Mohamed Mahmoudi

Joined Apr 16, 2019
4
Hi !

the load is L3/C2 it's a tank circuit the current there is about 50A pick , the objective is to achieve a pure reactive current gain .
 
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