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Old 10-06-2009, 05:56 PM
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Rosemary Ainslie COP>17 Heater Circuit - TEST #3

Hi everyone,

Here is the data for test #3 .... this one is the best yet with Mosfet drain spikes of over 500 volts and 70 volt being returned to the 24 Volt battery bank.

The test was ran over a 7 hour period (noted voltage loss .23 volts)

Duty Cycle - 22% (measured prior to 24Volt Battery Bank Connection)

Ambient Temperature - 77 Degrees F
Mosfet Temperature - 154 Degrees F
Load Resistor Temperature - 130 Degrees F

Gate Potentiometer Resistance - 7.2 ohms
On Potentiometer Resistance - 0 ohms (minimum)
Off Potentiometer Resistance - 10,000 ohms (maximum)

TEST #3

Rosemary Ainslie COP>17 Heater Circuit
"Quantum" October 2002

Replication Components -

1) International Rectifier - IRFPG50 HEXFET® Power MOSFET
w/ Sil-Pad insulator between Mosfet and Heat Sink

2) Fairchild Semiconductor - NE555N Timer

3) Vishay Spectrol - SP534 Percision Potentiometer/ 10-turn 2-Watt

4) Exide Technologies Battery "Liquid Lead Acid" Model # GT-H - TRACTOR 12V 12Ah CCA 235

5) CSB Battery Company "Gel Lead Acid" #GP 1270 F2 / 12 Volt 7.0 Ah

6) Test Load Resister "Quantum" 10 ohm Prototype

7) Shunt Resistor - Dale RS-2B 0.25 ohm 3 watt 3 %


Temperature Measurements -

Fluke 62 "mini" IR Themometer ( used maximum reading on each componenet )

Digital Mulit Meter -

Fluke 87 DMM true RMS

-------------------------------------------------------------------------

CHANNEL 1 - Mosfet source
CHANNEL 2 - Mosfet drain
CHANNEL 3 - 555 timer pin #3
CHANNEL 4 - 24 Volt Battery Bank



40us
40us 520V .XLR Spread Sheet File



20us
20us 520V .XLR Spread Sheet File



2us
2us 520V .XLR Spread Sheet File



1us
1us 520V .XLR Spread Sheet File



400ns
400ns 520V .XLR Spread Sheet File



200ns
200ns 520V .XLR Spread Sheet File



100ns
100ns 520V .XLR Spread Sheet File



All Images and data from the Tektronix TDS 3054C from the Tektronix Corporation

Glen
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Last edited by FuzzyTomCat; 10-08-2009 at 04:40 AM. Reason: credit to the Tektronix Corporaton - shunt resistor info