5 ms·

The cooker needs to work on continuous mode for setting the power, rather than pulse mode most (all?) of them do. Perhaps there exist such pro versions.

kkfx 4y ago
Perhaps, so far I have seen "relatively few" induction plate of various vendor and shape, none do that at low/mean temp, only pushed to the maximum (witch is used normally just to boil since for frying means melting the fryer itself, so where "the right temp" does not count that much). IR models, including some pro one from a restaurant of some friends, do the same, but at least heating outside the pot the effect is less seen inside. Classic resistance direct coupled with the pot (coated aluminum, BBQ-alike plachas etc) do the same, all seems to be unable to regulate the heat, that's means they can only run full power and regulate temp choosing how much alternate on-and-off states... Theoretically I can imaging an induction plate made of many very small coils stitched together in a matrix so it's possible power only some of them using the metal of the pot and round-robin rotation of powered coils to keep the heat well spread and a constant transfer of little heat as needed, but so far I do not see anything like that on sale. I only see some pot with small steel inserts in an aluminum alloy to spread better the heat in the pot, some others mix different stratus of materials to achieve something similar but all can't compensate the irregular source of heat much. Theoretically I suppose IR plate can do the same, so classic resistance instead of a single bend costantan-alike "pipe" (sorry for my English, not my motherlanguage) can be a set of smaller ones with a controller to power just some, but again I do not see anything similar on sale. Perhaps having a thermometer inside the pot instead of in the plate might be of help to mitigate the effect, but it's hard to achieve, similarly tie a plate with specific pot to ensure a certain behavior can mitigate, but definitively not solve the issue. We have apparently no way to compensate heat dispersion - heat generation... Just try yourself: put a pot on a plate, with a very thin stratus of cooking oil (<1mm) or just a thinker (<4mm) of water and set the plate to the minimum, you'll see alternation of frying/boiling moment and "low heat" ones. An optical thermometer can easily confirm. For induction even noise can confirm the origin, a power meter can equally certify that.
- linsomniac 4y ago
  I believe my Samsung Chef Collection ($3300-ish range ~5 years ago) does indeed have PWM or similar sort of fine control. Maybe you are just talking about the standalone induction hobs, but our range definitely seems to do more than just cycle the element on and off, or if it does it cycles it multiple times a second. Unless I'm missing something, here is the test you proposed, on our highest power burner (it may take a few minutes to finish processing and get 4K available), jumped to the "money shot", jump back to see other details: https://youtu.be/l4vg59llPlY?t=108 https://youtu.be/l4vg59llPlY?t=108
  - kkfx 4y ago
    Oh, wow, you've made a dedicated video, I'm honored :-) Well, no, I have bough and seen far cheaper plates, can't compare the USA prices but they are around 200-300€ from local kitchen appliance large vendors like Electro Depot, CDiscount, Ubaldi etc... And none of them offer such kind of behavior like the one in your video. To be more precise IF I put a pan with so little water on the the largest burner at boost level it evaporate in few seconds and start to make the pan itself red than white hot in few seconds more. I need to use the MINIMUM power for such cases.
adolph 4y ago
Do modern electric cooktops not operate by PWM?
- spookthesunset 4y ago
  Only if you measure the pulse width in terms of seconds and not milliseconds. What is interesting is the hot plate on my 3d printer uses millisecond PWM, but not my stove. I'm not quite sure what the advantages of either method are?
  - AdamH12113 4y ago
    PWM normally works with a constant DC voltage. If you’re driving a resistive heater with AC, the duty cycle loses its meaning unless the PWM frequency is much less than the AC frequency.
    - spookthesunset 4y ago
      Good point!
- deleted 4y ago
  [deleted]

kkfx 4y ago

Perhaps, so far I have seen "relatively few" induction plate of various vendor and shape, none do that at low/mean temp, only pushed to the maximum (witch is used normally just to boil since for frying means melting the fryer itself, so where "the right temp" does not count that much). IR models, including some pro one from a restaurant of some friends, do the same, but at least heating outside the pot the effect is less seen inside. Classic resistance direct coupled with the pot (coated aluminum, BBQ-alike plachas etc) do the same, all seems to be unable to regulate the heat, that's means they can only run full power and regulate temp choosing how much alternate on-and-off states... Theoretically I can imaging an induction plate made of many very small coils stitched together in a matrix so it's possible power only some of them using the metal of the pot and round-robin rotation of powered coils to keep the heat well spread and a constant transfer of little heat as needed, but so far I do not see anything like that on sale. I only see some pot with small steel inserts in an aluminum alloy to spread better the heat in the pot, some others mix different stratus of materials to achieve something similar but all can't compensate the irregular source of heat much. Theoretically I suppose IR plate can do the same, so classic resistance instead of a single bend costantan-alike "pipe" (sorry for my English, not my motherlanguage) can be a set of smaller ones with a controller to power just some, but again I do not see anything similar on sale. Perhaps having a thermometer inside the pot instead of in the plate might be of help to mitigate the effect, but it's hard to achieve, similarly tie a plate with specific pot to ensure a certain behavior can mitigate, but definitively not solve the issue. We have apparently no way to compensate heat dispersion - heat generation... Just try yourself: put a pot on a plate, with a very thin stratus of cooking oil (<1mm) or just a thinker (<4mm) of water and set the plate to the minimum, you'll see alternation of frying/boiling moment and "low heat" ones. An optical thermometer can easily confirm. For induction even noise can confirm the origin, a power meter can equally certify that.

linsomniac 4y ago
I believe my Samsung Chef Collection ($3300-ish range ~5 years ago) does indeed have PWM or similar sort of fine control. Maybe you are just talking about the standalone induction hobs, but our range definitely seems to do more than just cycle the element on and off, or if it does it cycles it multiple times a second. Unless I'm missing something, here is the test you proposed, on our highest power burner (it may take a few minutes to finish processing and get 4K available), jumped to the "money shot", jump back to see other details: https://youtu.be/l4vg59llPlY?t=108 https://youtu.be/l4vg59llPlY?t=108
- kkfx 4y ago
  Oh, wow, you've made a dedicated video, I'm honored :-) Well, no, I have bough and seen far cheaper plates, can't compare the USA prices but they are around 200-300€ from local kitchen appliance large vendors like Electro Depot, CDiscount, Ubaldi etc... And none of them offer such kind of behavior like the one in your video. To be more precise IF I put a pan with so little water on the the largest burner at boost level it evaporate in few seconds and start to make the pan itself red than white hot in few seconds more. I need to use the MINIMUM power for such cases.

adolph 4y ago

Do modern electric cooktops not operate by PWM?

spookthesunset 4y ago
Only if you measure the pulse width in terms of seconds and not milliseconds. What is interesting is the hot plate on my 3d printer uses millisecond PWM, but not my stove. I'm not quite sure what the advantages of either method are?
- AdamH12113 4y ago
  PWM normally works with a constant DC voltage. If you’re driving a resistive heater with AC, the duty cycle loses its meaning unless the PWM frequency is much less than the AC frequency.
  - spookthesunset 4y ago
    Good point!
deleted 4y ago
[deleted]