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Microwave oven PWM frequency
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David Hess:

--- Quote from: coppice on June 23, 2020, 03:57:18 pm ---When I bought a Panasonic microwave oven 20 years ago they were not inverter types and they did last well. The early inverter ones had a poor reputation for reliability and longevity. I don't know if that has improved.
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Exactly, that is what I found when I looked into it last year.  And replacement inverters are either expensive or not available.
NiHaoMike:
I wonder if it could be possible to hack an inverter microwave oven to be more Wifi friendly by preferring to operate when there is no Wifi activity and/or by broadcasting RTS/CTS packets (using an ESP8266 or similar) to tell Wifi networks to avoid sending data when the microwave wants to operate.
tom66:

--- Quote from: coppice on June 23, 2020, 03:57:18 pm ---
--- Quote from: tooki on June 23, 2020, 03:52:05 pm ---The primary manufacturer of inverter microwaves is Panasonic, whose microwave ovens have a great reputation, and AFAIK no issues whatsoever with longevity. (They’re all I’ve used for 20 years, and I’ve never had one die. I’ve only gotten new ones because of moving to a country with different mains voltage, or to upgrade to one with new features.)

--- End quote ---
When I bought a Panasonic microwave oven 20 years ago they were not inverter types and they did last well. The early inverter ones had a poor reputation for reliability and longevity. I don't know if that has improved.

--- End quote ---

Our is 8 years old and still going strong.   Really like the "turbo bake" feature where it can use the oven and grill simultaneously for 3000W cooking - makes for some really nice roast potatoes with a crispy top but cooked through. 

The only failure is the plastic that's glued to the front of the door has peeled off. Funnily enough the same failure has happened to the one in the work kitchen (same generation, different model.)  I have yet to find an adhesive that survives the high temperature of the oven's operation so I haven't been able to glue it back on permanently yet.
Yansi:

--- Quote from: John Heath on February 13, 2018, 01:46:06 am ---A microwave oven is switching on and off every 8 m seconds as well as every second or so. The reason for this is it is against the law for a microwave oven to run off a filter DC power supply. It must be a unfiltered supply raw off the full bridge rectifier thus on and off every 8 m second. The reason for this law is to sweep a gigantically stupid law passed before under the rug. The gigantically stupid law was to have a 1000 watt microwave  and a tiny 100 m watt WIFI in the same frequency range. The solution , equally as dumb , was to out law filtered power supplies in microwave ovens so that the tiny 100 m watt WIFI can sneak a few bytes out in a 2 m second window between power cycles of a monster 1000 watt microwave. Is it just me or did someone drop the ball here? Thank god for 5 GHz WIFI.

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Seems a pretty much nonsense my friend.  :wtf:
Yansi:

--- Quote from: NiHaoMike on June 25, 2020, 04:30:26 am ---I wonder if it could be possible to hack an inverter microwave oven to be more Wifi friendly by preferring to operate when there is no Wifi activity and/or by broadcasting RTS/CTS packets (using an ESP8266 or similar) to tell Wifi networks to avoid sending data when the microwave wants to operate.

--- End quote ---

No, because inverter microwave just means that the bulky transformer supply was replaced by a high frequency inverter. The magnetron is still there, spewing all sorts of shit somewhere in the 2450 MHz or so. There is no control over the frequency possible. Neigher does the magnetron run on DC voltage, it still uses the pulsed rectified voltage from mains. There would be no benefit in running the inverter from DC, in fact that would be an disadvantage.
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