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Add new SOA parameters (safe operating area) for BJT. 

We now scan for max of Ic, Ib, power, taking into
account the max allowed temperature, using the thermal
resistance rth0 model parameter between juntion and ambient.

Two user options are there: If rth0 is given, we calculate
a derating of the max power allowed.
Without a constant max power according to model param pow_max
is assumed.

The new model parameters for the bipolar model are:
pow_max, ic_max, ib_max, te_max, and rth0, in addition
to the already existing vbe_max, vbc_max, adn vce_max.
pre-master-46
Holger Vogt 5 years ago
parent
1084b4205c
commit
a08e6a0676
7 changed files with 176 additions and 17 deletions
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  1. 19
      examples/soa/bjt-soa.cir
  2. 7
      src/spicelib/devices/bjt/bjt.c
  3. 15
      src/spicelib/devices/bjt/bjtdefs.h
  4. 13
      src/spicelib/devices/bjt/bjtmask.c
  5. 21
      src/spicelib/devices/bjt/bjtmpar.c
  6. 14
      src/spicelib/devices/bjt/bjtsetup.c
  7. 104
      src/spicelib/devices/bjt/bjtsoachk.c

19
examples/soa/bjt-soa.cir
View File

@ -0,0 +1,19 @@
SOA check for bipolar
Vce c 0 -1
Ib b 0 -1u
Ve e 0 0
Q1 c b e MPSA92
.MODEL MPSA92 PNP(IS=9.53E-14 ISE=8.37E-13 ISC=9.99E-11 XTI=3.00 BF=9.80E1 BR=4.78 IKF=3.49E-2 IKR=1.00 XTB=1.5 VAF=2.60E2 VAR=1.40E2 VJE=3.00E-1 VJC=3.00E-1 RE=1.00E-2 RC=1.00E-2 RB=2.76E1 RBM=6.66E-2 IRB=7.02E-4 CJE=9.54E-11 CJC=4.66E-11 .00 FC=5.00E-1 NF=1.00 NR=1.55 NE=1.49 NC=1.50 MJE=4.26E-1 MJC=7.00E-1 TF=9.52E-10 TR=516.9p ITF=4.12E-1 VTF=9.99E5 XTF=1.03 EG=1.11 VCEO=300 ICRATING=500m MFG=SIEMENS pow_max=0.625 rth0=200 tnom=25)
.option warn=1 maxwarns=2
.temp 50
.control
dc Vce 0 -200 -0.1 Ib 0 80u 8u
plot i(Ve)
.endc
.end

7
src/spicelib/devices/bjt/bjt.c
View File

@ -229,7 +229,12 @@ IFparm BJTmPTable[] = { /* model parameters */
IOP("d", BJT_MOD_XD, IF_REAL, "Temperature exponent of VO"), IOP("d", BJT_MOD_XD, IF_REAL, "Temperature exponent of VO"),
IOP("vbe_max", BJT_MOD_VBE_MAX, IF_REAL, "maximum voltage B-E junction"), IOP("vbe_max", BJT_MOD_VBE_MAX, IF_REAL, "maximum voltage B-E junction"),
IOP("vbc_max", BJT_MOD_VBC_MAX, IF_REAL, "maximum voltage B-C junction"), IOP("vbc_max", BJT_MOD_VBC_MAX, IF_REAL, "maximum voltage B-C junction"),
IOP("vce_max", BJT_MOD_VCE_MAX, IF_REAL, "maximum voltage C-E branch")
IOP("vce_max", BJT_MOD_VCE_MAX, IF_REAL, "maximum voltage C-E branch"),
IOP("pow_max", BJT_MOD_POW_MAX, IF_REAL, "maximum device power dissipation"),
IOP("ic_max", BJT_MOD_IC_MAX, IF_REAL, "maximum collector current"),
IOP("ib_max", BJT_MOD_IB_MAX, IF_REAL, "maximum base current"),
IOP("te_max", BJT_MOD_TE_MAX, IF_REAL, "maximum temperature"),
IOP("rth0", BJT_MOD_RTH0, IF_REAL, "thermal resistance juntion to ambient"),
}; };
char *BJTnames[] = { char *BJTnames[] = {

15
src/spicelib/devices/bjt/bjtdefs.h
View File

@ -498,6 +498,11 @@ typedef struct sBJTmodel { /* model structure for a bjt */
double BJTvbeMax; /* maximum voltage over B-E junction */ double BJTvbeMax; /* maximum voltage over B-E junction */
double BJTvbcMax; /* maximum voltage over B-C junction */ double BJTvbcMax; /* maximum voltage over B-C junction */
double BJTvceMax; /* maximum voltage over C-E branch */ double BJTvceMax; /* maximum voltage over C-E branch */
double BJTicMax; /* maximum collector current */
double BJTibMax; /* maximum base current */
double BJTpowMax; /* maximum device power dissipation */
double BJTteMax; /* maximum device temperature */
double BJTrth0; /* thermal resistance juntion to ambient */
unsigned BJTsubsGiven : 1; unsigned BJTsubsGiven : 1;
unsigned BJTtnomGiven : 1; unsigned BJTtnomGiven : 1;
@ -617,6 +622,11 @@ typedef struct sBJTmodel { /* model structure for a bjt */
unsigned BJTvbeMaxGiven : 1; unsigned BJTvbeMaxGiven : 1;
unsigned BJTvbcMaxGiven : 1; unsigned BJTvbcMaxGiven : 1;
unsigned BJTvceMaxGiven : 1; unsigned BJTvceMaxGiven : 1;
unsigned BJTpowMaxGiven : 1;
unsigned BJTicMaxGiven : 1;
unsigned BJTibMaxGiven : 1;
unsigned BJTteMaxGiven : 1;
unsigned BJTrth0Given : 1;
} BJTmodel; } BJTmodel;
#ifndef NPN #ifndef NPN
@ -770,6 +780,11 @@ enum {
BJT_MOD_VBE_MAX, BJT_MOD_VBE_MAX,
BJT_MOD_VBC_MAX, BJT_MOD_VBC_MAX,
BJT_MOD_VCE_MAX, BJT_MOD_VCE_MAX,
BJT_MOD_POW_MAX,
BJT_MOD_IC_MAX,
BJT_MOD_IB_MAX,
BJT_MOD_TE_MAX,
BJT_MOD_RTH0,
}; };
/* device questions */ /* device questions */

13
src/spicelib/devices/bjt/bjtmask.c
View File

@ -416,6 +416,19 @@ BJTmAsk(CKTcircuit *ckt, GENmodel *instPtr, int which, IFvalue *value)
return(OK); return(OK);
case BJT_MOD_VCE_MAX: case BJT_MOD_VCE_MAX:
value->rValue = here->BJTvceMax; value->rValue = here->BJTvceMax;
case BJT_MOD_IC_MAX:
value->rValue = here->BJTicMax;
return(OK);
case BJT_MOD_IB_MAX:
value->rValue = here->BJTibMax;
return(OK);
case BJT_MOD_POW_MAX:
value->rValue = here->BJTpowMax;
case BJT_MOD_RTH0:
value->rValue = here->BJTrth0;
return(OK);
case BJT_MOD_TE_MAX:
value->rValue = here->BJTteMax;
return(OK); return(OK);
default: default:
return(E_BADPARM); return(E_BADPARM);

21
src/spicelib/devices/bjt/bjtmpar.c
View File

@ -506,6 +506,27 @@ BJTmParam(int param, IFvalue *value, GENmodel *inModel)
mods->BJTvceMax = value->rValue; mods->BJTvceMax = value->rValue;
mods->BJTvceMaxGiven = TRUE; mods->BJTvceMaxGiven = TRUE;
break; break;
case BJT_MOD_IC_MAX:
mods->BJTicMax = value->rValue;
mods->BJTicMaxGiven = TRUE;
break;
case BJT_MOD_IB_MAX:
mods->BJTibMax = value->rValue;
mods->BJTibMaxGiven = TRUE;
break;
case BJT_MOD_POW_MAX:
mods->BJTpowMax = value->rValue;
mods->BJTpowMaxGiven = TRUE;
break;
case BJT_MOD_TE_MAX:
mods->BJTteMax = value->rValue;
mods->BJTteMaxGiven = TRUE;
break;
case BJT_MOD_RTH0:
mods->BJTrth0 = value->rValue;
mods->BJTrth0Given = TRUE;
break;
default: default:
return(E_BADPARM); return(E_BADPARM);
} }

14
src/spicelib/devices/bjt/bjtsetup.c
View File

@ -369,6 +369,20 @@ BJTsetup(SMPmatrix *matrix, GENmodel *inModel, CKTcircuit *ckt, int *states)
model->BJTvceMax = 1e99; model->BJTvceMax = 1e99;
} }
if(!model->BJTicMaxGiven) {
model->BJTicMax = 1e99;
}
if(!model->BJTibMaxGiven) {
model->BJTibMax = 1e99;
}
if(!model->BJTpowMaxGiven) {
model->BJTpowMax = 1e99;
}
if(!model->BJTteMaxGiven) {
model->BJTteMax = 1e99;
}
/* /*
* COMPATABILITY WARNING! * COMPATABILITY WARNING!
* special note: for backward compatability to much older models, spice 2G * special note: for backward compatability to much older models, spice 2G

104
src/spicelib/devices/bjt/bjtsoachk.c
View File

@ -18,13 +18,20 @@ BJTsoaCheck(CKTcircuit *ckt, GENmodel *inModel)
BJTmodel *model = (BJTmodel *) inModel; BJTmodel *model = (BJTmodel *) inModel;
BJTinstance *here; BJTinstance *here;
double vbe, vbc, vce; /* actual bjt voltages */ double vbe, vbc, vce; /* actual bjt voltages */
double pow;
double ic, ib; /* actual bjt currents */
int maxwarns; int maxwarns;
static int warns_vbe = 0, warns_vbc = 0, warns_vce = 0; static int warns_vbe = 0, warns_vbc = 0, warns_vce = 0;
static int warns_pow = 0, warns_ic = 0, warns_ib = 0;
if (!ckt) { if (!ckt) {
warns_vbe = 0; warns_vbe = 0;
warns_vbc = 0; warns_vbc = 0;
warns_vce = 0; warns_vce = 0;
warns_pow = 0;
warns_ic = 0;
warns_ib = 0;
return OK; return OK;
} }
@ -32,40 +39,105 @@ BJTsoaCheck(CKTcircuit *ckt, GENmodel *inModel)
for (; model; model = BJTnextModel(model)) { for (; model; model = BJTnextModel(model)) {
for (here = BJTinstances(model); here; here=BJTnextInstance(here)) {
for (here = BJTinstances(model); here; here = BJTnextInstance(here)) {
vbe = fabs(ckt->CKTrhsOld [here->BJTbasePrimeNode] -
ckt->CKTrhsOld [here->BJTemitPrimeNode]);
vbc = fabs(ckt->CKTrhsOld [here->BJTbasePrimeNode] -
ckt->CKTrhsOld [here->BJTcolPrimeNode]);
vce = fabs(ckt->CKTrhsOld [here->BJTcolPrimeNode] -
ckt->CKTrhsOld [here->BJTemitPrimeNode]);
vbe = fabs(ckt->CKTrhsOld[here->BJTbasePrimeNode] -
ckt->CKTrhsOld[here->BJTemitPrimeNode]);
vbc = fabs(ckt->CKTrhsOld[here->BJTbasePrimeNode] -
ckt->CKTrhsOld[here->BJTcolPrimeNode]);
vce = fabs(ckt->CKTrhsOld[here->BJTcolPrimeNode] -
ckt->CKTrhsOld[here->BJTemitPrimeNode]);
if (vbe > model->BJTvbeMax) if (vbe > model->BJTvbeMax)
if (warns_vbe < maxwarns) { if (warns_vbe < maxwarns) {
soa_printf(ckt, (GENinstance*) here,
"|Vbe|=%g has exceeded Vbe_max=%g\n",
vbe, model->BJTvbeMax);
soa_printf(ckt, (GENinstance*)here,
"|Vbe|=%g has exceeded Vbe_max=%g\n",
vbe, model->BJTvbeMax);
warns_vbe++; warns_vbe++;
} }
if (vbc > model->BJTvbcMax) if (vbc > model->BJTvbcMax)
if (warns_vbc < maxwarns) { if (warns_vbc < maxwarns) {
soa_printf(ckt, (GENinstance*) here,
"|Vbc|=%g has exceeded Vbc_max=%g\n",
vbc, model->BJTvbcMax);
soa_printf(ckt, (GENinstance*)here,
"|Vbc|=%g has exceeded Vbc_max=%g\n",
vbc, model->BJTvbcMax);
warns_vbc++; warns_vbc++;
} }
if (vce > model->BJTvceMax) if (vce > model->BJTvceMax)
if (warns_vce < maxwarns) { if (warns_vce < maxwarns) {
soa_printf(ckt, (GENinstance*) here,
"|Vce|=%g has exceeded Vce_max=%g\n",
vce, model->BJTvceMax);
soa_printf(ckt, (GENinstance*)here,
"|Vce|=%g has exceeded Vce_max=%g\n",
vce, model->BJTvceMax);
warns_vce++; warns_vce++;
} }
ic = fabs(*(ckt->CKTstate0 + here->BJTcc));
if (ic > fabs(model->BJTicMax))
if (warns_ic < maxwarns) {
soa_printf(ckt, (GENinstance*)here,
"Ic=%.4g A at Vce=%.4g V has exceeded Ic_max=%.4g A\n",
ic, vce, model->BJTicMax);
warns_ic++;
}
ib = fabs(*(ckt->CKTstate0 + here->BJTcb));
if (ib > fabs(model->BJTibMax))
if (warns_ib < maxwarns) {
soa_printf(ckt, (GENinstance*)here,
"Ib=%.4g A at Vbe=%.4g V has exceeded Ib_max=%.4g A\n",
ib, vbe, model->BJTibMax);
warns_ib++;
}
if (warns_pow < maxwarns) {
pow = fabs(*(ckt->CKTstate0 + here->BJTcc) *
(*(ckt->CKTrhsOld + here->BJTcolNode) -
*(ckt->CKTrhsOld + here->BJTemitNode))
);
pow += fabs(*(ckt->CKTstate0 + here->BJTcb) *
(*(ckt->CKTrhsOld + here->BJTbaseNode) -
*(ckt->CKTrhsOld + here->BJTemitNode))
);
pow += fabs(*(ckt->CKTstate0 + here->BJTcdsub) *
(*(ckt->CKTrhsOld + here->BJTsubstConNode) -
*(ckt->CKTrhsOld + here->BJTsubstNode))
);
if ((ckt->CKTcurrentAnalysis & DOING_TRAN) && !(ckt->CKTmode &
MODETRANOP)) {
pow += *(ckt->CKTstate0 + here->BJTcqsub) *
fabs(*(ckt->CKTrhsOld + here->BJTsubstConNode) -
*(ckt->CKTrhsOld + here->BJTsubstNode));
}
pow *= here->BJTm;
/* derating without self-heating, external temp and model tnom given */
if (model->BJTrth0Given && model->BJTpowMaxGiven && model->BJTtnomGiven) {
double pow_max;
if (here->BJTtemp < model->BJTtnom)
pow_max = model->BJTpowMax;
else {
pow_max = model->BJTpowMax - (here->BJTtemp - model->BJTtnom) / model->BJTrth0;
pow_max = (pow_max > 0) ? pow_max : 0.;
}
if (pow > pow_max) {
soa_printf(ckt, (GENinstance*)here,
"Pow=%.4g W has exceeded Pow_max=%.4g W\n at Vce=%.4g V, Ib=%.4g A, Ic=%.4g A, and Te=%.4g C\n",
pow, pow_max, vce, ib, ic, here->BJTtemp - CONSTCtoK);
warns_pow++;
}
}
/* no derating */
else {
if (pow > model->BJTpowMax) {
soa_printf(ckt, (GENinstance*)here,
"Pow=%.4g W has exceeded Pow_max=%.4g W\n at Vce=%.4g V, Ib=%.4g A, and Ic=%.4g A\n",
pow, model->BJTpowMax, vce, ib, ic);
warns_pow++;
}
}
}
} }
} }
return OK; return OK;

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