Published September 2, 2020 © GPL3+

Spice simulation of temperature derating of boost converter

As temperature reaches a limit, the presented circuit simulation of a boost converter shows a decrease of duty time for the gate driver.

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Spice simulation of temperature derating of boost converter

Things used in this project

Hardware components

Vishay NTCC200E4203FT

Infineon IRG4PC50W

Vishay CRCW

Story

This boost converter simulation shows a possible derating of voltage ratio Vout/Vin when temperature rises up above a certain threshold. The duty cycle begins then to decrease (by the pulse wave modulation applied to the gate of the IGBT). The temperature is measured by a Vishay NTC (Wire bondable die NTCC200). The IGBT and diode models have been transformed into thermal models (a supplementary output pin models the internal heat created into the devices ; this pin is directly connected to the thermal RC network modeling the heat sink). The final temperature Tsyst is measured by the NTC, including into a small circuit which produces a PWM of the gate of the IGBT.

This first capture gives a circuit topology of the Boost converter, with the thermal circuit.

This second capture represents the Vin and Vout variation (above pane), the Vsense (mid pane) and on the lower pane the system temperature and the ambient temperature. When the temperature limitation is activated, the system temperature Tsyst stabilizes just a few degrees above an ambient temperature of 100°C, as the ratio Vout/Vin is reduced to 1 (full derating).

Code

LTspice netlist of Vishay NTCC200-NTCC300

* Voltage_driven_thermistor NTCC200/NTCC300
* Copyright:
* Vishay Intertechnology, Inc.
* customer : general
* Revision:   1.0  $
* Author:   Alain Stas  $
* Date:   30 May 2018 $
* Revision History :correction <> introduced
*---------------------------------------------------------------
* data sheet :http://$http//www.vishay.com/doc?29153
*             http://$http//www.vishay.com/doc?29168
* the different R25 and B are as follows : NTCC200E4472xT    4700 ohms B=3435K
*                                                   123xT   12000 ohms B=3740K
*                                                   203xT   20000 ohms B=3865K
*                                                   C90008   5063 ohms B= 3435K
*                                          NTCC300E4472xT    4700 ohms B=3435K
*                                                   123xT    12000 ohms B=3740K
*                                                   203xT    20000 ohms B=3865K
*
*                electrical pins (to be connected to electrical circuit)
*$                |  |
*                 |  | temperature pin ( for simulation only ,this is the pin for temperature input under the form of a voltage)
*                 |  | |
.SUBCKT NTC_BASE RN Rp Ti Params: W=1 X=1 Y=1 Z=1 GTH=1 GTH1=1 CTH=1 A=1 R25=1 B=1 C=1 D=1 T0=273.15 TRmc=5 TBmc=1
R_RTR    0  TR  {mc(1,TR-1)}
I_ITR    0 TR 1
R_RTB    0 TB  {mc(1,TB-1)}
I_ITB    0 TB  1
G_G1         AOUT 0 VALUE { if(V(Ti)>25,V(AOUT,
+  0)/(R25*V(TR)*exp(((D*V(TB)/(T0+abs(V(H))+V(Ti))+C*V(TB))/(T0+abs(V(H))+V(Ti))+B*V(TB))/(T0+V(Ti)+abs(V(H)))+A*V(TB))),0)
+  }
G_G2         AOUT 0 VALUE { IF(V(Ti)>25,0,V(AOUT,
+  0)/(R25*V(TR)*exp(((Z*V(TB)/(T0+abs(V(H))+V(Ti))+Y*V(TB))/(T0+abs(V(H))+V(Ti))+X*V(TB))/(T0+abs(V(H))+V(Ti))+W*V(TB))))
+  }
G_G3         H 0 VALUE {
+  if(V(Ti)>25,-V(RP,RN)*V(RP,RN)/(R25*V(TR)*exp(((D*V(TB)/(T0+abs(V(H))+V(Ti))+C*V(TB))/(T0+abs(V(H))+V(Ti))+B*V(TB))/
+  (T0+V(Ti)+abs(V(H)))+A*V(TB))),0)}
G_G4         H 0 VALUE {
+  if(V(Ti)>25,0,-V(RP,RN)*V(RP,RN)/(R25*V(TR)*exp(((Z*TB/(T0+abs(V(H))+V(Ti))+Y*V(TB))/(T0+abs(V(H))+V(Ti))+X*V(TB))/
+  (T0+V(Ti)+abs(V(H)))+W*V(TB))))}
G_G5         RP RN VALUE { V(RP, RN)/V(AOUT) }
G_G6         H 0 VALUE { V(H)*(Gth + Gth1*(V(Ti)-25)) }
I_I1         0 AOUT DC 1Adc
R_R1         0 AOUT  1T TC=0,0
R_R2         0 H  1T TC=0,0
C_C1         0 H  {Cth}
R_R99        0 Ti 1T
.IC V(H) =0
.ENDS
*$
.ENDS
*$
.subckt NTCC200E4C90008 Rn Rp Ti params:tolR=0 tolB=0
X1 Rn Rp Ti NTC_BASE Params:
+ w=-12.89228328
+ x=4245.148
+ y=-87493
+ z=-9588114
+ gth=0.0048 gth1 = 0.0000267
+ cth=0.03216
+ a=-12.89228328
+ r25=5063.3
+ b=4245.148
+ c=-87493
+ d=-9588114
+ T0=273.15
+ TR={1+TOLR/100}
+ TB={1+TOLB/100}
.ends
*$
.subckt NTCC200E4472_T Rn Rp Ti params:tolR=0 tolB=0
X2 Rn Rp Ti NTC_BASE Params:
+ w=-12.89228328
+ x=4245.148
+ y=-87493
+ z=-9588114
+ gth=0.0048 gth1 = 0.0000267
+ cth=0.03216
+ a=-12.89228328
+ r25=4700
+ b=4245.148
+ c=-87493
+ d=-9588114
+ T0=273.15
+ TR={1+TOLR/100}
+ TB={1+TOLB/100}
.ends
*$
.subckt NTCC200E4203_T Rn Rp Ti params:tolR=0 tolB=0
X3 Rn Rp Ti NTC_BASE Params:
+ w=-14.5989052263466
+ x=4857.53091896502
+ y=-121603.266489124
+ z=-8619624.14907006
+ gth=0.0048 gth1 = 0.0000267
+ cth=0.03216
+ a=-14.5989052263466
+ r25=20000
+ b=4857.53091896502
+ c=-121603.266489124
+ d=-8619624.14907006
+ T0=273.15
+ TR={1+TOLR/100}
+ TB={1+TOLB/100}
.ends
*$
.subckt NTCC200E4123_T Rn Rp Ti params:tolR=0 tolB=0
X4 Rn Rp Ti NTC_BASE Params:
+ w=-13.89732294
+ x=4557.725
+ y=-98275
+ z=-7522357
+ gth=0.0048 gth1 = 0.0000267
+ cth=0.03216
+ a=-13.89732294
+ r25=12000
+ b=4557.725
+ c=-98275
+ d=-7522357
+ T0=273.15
+ TR={1+TOLR/100}
+ TB={1+TOLB/100}
.ends
*$
.subckt NTCC300E4472_T Rn Rp Ti params:tolR=0 tolB=0
X5 Rn Rp Ti NTC_BASE Params:
+ w=-12.89228328
+ x=4245.148
+ y=-87493
+ z=-9588114
+ gth=0.0048 gth1 = 0.0000267
+ cth=0.03216
+ a=-12.89228328
+ r25=4700
+ b=4245.148
+ c=-87493
+ d=-9588114
+ T0=273.15
+ TR={1+TOLR/100}
+ TB={1+TOLB/100}
.ends
*$
.subckt NTCC300E4203_T Rn Rp Ti params:tolR=0 tolB=0
X6 Rn Rp Ti NTC_BASE Params:
+ w=-14.5989052263466
+ x=4857.53091896502
+ y=-121603.266489124
+ z=-8619624.14907006
+ gth=0.0048 gth1 = 0.0000267
+ cth=0.03216
+ a=-14.5989052263466
+ r25=20000
+ b=4857.53091896502
+ c=-121603.266489124
+ d=-8619624.14907006
+ T0=273.15
+ TR={1+TOLR/100}
+ TB={1+TOLB/100}
.ends
*$
.subckt NTCC300E4123_T Rn Rp Ti params:tolR=0 tolB=0
X7 Rn Rp Ti NTC_BASE Params:
+ w=-13.89732294
+ x=4557.725
+ y=-98275
+ z=-7522357
+ gth=0.0048 gth1 = 0.0000267
+ cth=0.03216
+ a=-13.89732294
+ r25=12000
+ b=4557.725
+ c=-98275
+ d=-7522357
+ T0=273.15
+ TR={1+TOLR/100}
+ TB={1+TOLB/100}
.ends
*$

Credits

alainstas

67 projects • 35 followers

product marketing engineer at Vishay. began to simulate in spice programs in 2014.

Spice simulation of temperature derating of boost converter

Things used in this project

Hardware components

Story

Schematics

LTspice simulation of boost converter with temperature derating

Code

LTspice netlist of Vishay NTCC200-NTCC300

Credits

alainstas

Comments

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Spice simulation of temperature derating of boost converter

Spice simulation of temperature derating of boost converter

Things used in this project

Hardware components

Story

Schematics

LTspice simulation of boost converter with temperature derating

Code

LTspice netlist of Vishay NTCC200-NTCC300

Credits

alainstas

Comments

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