Re: Resistive load - 100 watt lamp.pdf

Nov 15, 2009 2 Replies
J

I developed this subcircuit when modeling some aircraft lamp drivers....


****
** AIRCRAFT LAMP SUBCIRCUIT
*VO=NOMINAL OPERATING VOLTAGE
*IO=NOMINAL STEADY STATE OPERATING CURRENT
*RCOLD=FILAMEMT RESISTANCE MEASURED AT ROOM TEMP (300K)
*TAU=CURRENT TIME CONSTANT AFTER A 0 (zero) TO VO STEP IS APPLIED .SUBCKT LAMP 1 2 PARAMS: VO=28 IO=25m RCOLD=112 TAU=22m TAMB=300 H1 6 0 VML 1 RH1 6 0 1 GP 0 4 VALUE={V(6)*V(1,2)}
*V(4,0) = FILAMENT TEMPERATURE IN KELVINS RT 4 5 {300*(VO-IO*RCOLD)/(IO*IO*VO*RCOLD)} CT 4 5 {TAU*IO*IO*VO*RCOLD/(300*(VO-IO*RCOLD))} VAMB 5 0 {TAMB} El 7 0 1 2 300 R1 7 0 1 E2 8 0 VALUE={V(4)*RCOLD} R2 8 0 1 E3 10 0 7 9 10MEG R3 10 0 1 E4 9 0 VALUE={V(8)*V(10)} R4 9 0 1 GR 1 3 10 2 1 VML 3 2 0 .ENDS LAMP
**** ...Jim Thompson
| James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | If you wanted a President with balls why didn\'t you elect Hillary?
Vote
Twitter Facebook LinkedIn
R

Prior to the LED days, Motorola once made radio dispatch consoles that used incandescent lamps for PTT and channel activity call light. These lamps were 24 VDC and turned on and off thousands of times. There was a small resistor across the open collector driver to keep the lamps slightly lit to prevent dmage to the lamp and the transistor driver.

Joe Leikhim K4SAT "The RFI-EMI-GUY"© "Use only Genuine Interocitor Parts" Tom Servo ;-P
Vote
Twitter Facebook LinkedIn
J

My first round design of the T-Bird sequential turn signals (replacement for the motor/cam thingy) did that, then I went to a chip driving SCR's... interruption the conventional bi-metal way. ...Jim Thompson

| James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC\'s and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | Obama thinks the term "bully pulpit" actually means "pulpit bully"
Vote
Twitter Facebook LinkedIn

Join the Discussion

Have something to add? Share your thoughts — no account required.

Didn't find your answer?

Ask the community — no account required