Timeline for What is a Constant Power Circuit?
Current License: CC BY-SA 3.0
13 events
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| Jun 2, 2012 at 12:06 | comment | added | user924 | You say series resistor is better than volage regulator. No. This is exactly the mistake of researcher. Or my mistake thinking that heater has positive T coeff | |
| Jun 2, 2012 at 11:59 | comment | added | Russell McMahon♦ | Perhaps unintuitively, a series resistance produces a lower variation in heater power than does constant voltage, when heater resistance variations are considered.Best = constant power cct. 2nd best = series resistor. 3rd best = voltage regulator. | |
| Jun 2, 2012 at 3:18 | comment | added | user924 | Yes. V-regulator will work better that simple resistor. And, yes, the self power regulation heat->resistance will help a bit. But for true const power you will need complete "const power source" | |
| Jun 2, 2012 at 3:15 | comment | added | vicatcu | ok... so you think my idea to just use a fixed voltage regulator at 2.4V across the heating element then? I'm going to give some other people a chance to weigh in before accepting an answer | |
| Jun 2, 2012 at 3:01 | comment | added | user924 | OK found it. The claim of 2% immunity in power variations is false. 30% resistance change in chain with 10x const resistor is 2-3% of total resistance change and 30% voltage change with undercompensation in DC. Power will fluctuate even worse if resistor is present. The researcher was simply wrong. | |
| Jun 2, 2012 at 2:56 | comment | added | vicatcu | I've linked the FAQ in the question if that helps as well... | |
| Jun 2, 2012 at 2:54 | comment | added | user924 | Thank you. I finally understood the source of confusion. The paper should be simply ignored. I wil google it, to see where is it coming from. | |
| Jun 2, 2012 at 2:52 | history | edited | user924 | CC BY-SA 3.0 |
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| Jun 2, 2012 at 2:50 | comment | added | vicatcu | yes you need a series resistor with the sensing element to generate a sense voltage, but the quote above is also calling or a series resistance with heater resistance. | |
| Jun 2, 2012 at 2:32 | history | undeleted | user924 | ||
| Jun 2, 2012 at 2:32 | history | deleted | user924 | ||
| Jun 2, 2012 at 2:32 | history | edited | user924 | CC BY-SA 3.0 |
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| Jun 2, 2012 at 2:23 | history | answered | user924 | CC BY-SA 3.0 |