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Chinese iron and its modernization


My wife bought an iron made in China using American technology. I worked for three months and stopped turning on. I decided to figure out what was going on and began to study all of his data. And I was very surprised when I read on the plate that its power is 2000-2200W. Where so much? This is the current under 10A, it turns out that when the wife strokes the linen she also heats the room. Yes, we already have hot batteries and the housing and communal services are tearing at the meter maximum in any weather.

Come on, something I'm not talking about. In general, I dismantled the iron with the nerves, the fact is that almost all the parts are latched and they break in infection when disassembled. The reason for the failure was immediately determined - there is no connection in the temperature sensor that turns on the heater. I washed it with alcohol, but there was still no contact, even with the mechanical regulator turned as much as possible. It is not clear what material these contacts are made of, well, certainly not of silver. In short, he mechanically cleaned with a scalpel and contact appeared. The reason for this malfunction is that with such an iron power, the heater turns off frequently, as the temperature is reached very quickly. And the frequent inclusion of the heater is due to the fact that the mass of the heated part is not large and is made of light metal of unknown origin. That is, the heat quickly leaves. Yes, I forgot to say that there is still water to create steam, it also cools.

In general, I decided to assemble a power regulator for the iron. The appearance will be similar to the previously published homemade, only instead of the fixed settings I will set the potentiometer. The scheme is grandfather, but very reliable.

Its main advantages are:
1. There are no failures and disruptions of synchronization when turned on.
2. Very low current consumption.
3. It works in a wide temperature range.
4. Can control any power triac.
5. Accessible parts list.

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8 comments
Ivan_Pokhmelev,
You can’t blurt out sleep swoon
ino53, look at what I answered. yes
There, we are not talking about a simple and obvious option, but rather complicated, but without a primitive switch. ;)
Ivan_Pokhmelev,
What are you about!? 561IE8 is a simple CMOS counter with a decoder at the output, programmed with jumpers.
Quote: Razrabotchik
in case of accidental loss of network IE8 will be reset,
This is not a bug, but a feature. ;)
It’s better, always the iron will turn on at minimum power, without the danger of burning something. because last time stroking linen or thick cotton.
Quote: Razrabotchik
In the USSR, irons produced no more than 500 watts

Not true! There were kilowatt.
In any case, the "USSR" iron was heated for a long time. Modern powerful heating elements are needed precisely for quick heating! Moreover, the thermal inertia of modern irons has been greatly reduced (a thin sole made of "indestructible" instead of a very massive steel plate), which also has to be compensated for by very frequent inclusions and very fast heating.
Author
Ivan_Pokhmelev,
Probably the method is correct, but when applying the modernized circuit, the current in the outlet will become less at times. In the USSR, irons produced no more than 500 watts. and they themselves worked quite normally. And the circuit works just through zero with a clear synchronization and you can get from 1–2200 (watts) at the output. The husband is happy, the only thing was to put labels when choosing the ironing mode. And the unreliable contact had to be left as protection against maximum power.

ino53,
561IE8 can be used in this scheme to select modes with touch or button control, but if the network is accidentally lost, IE8 will be reset, and you do not want to cling to the battery.
Ivan_Pokhmelev,
That's why I thought then: IE8, triggered by a network transition through 0, TM2 in RS mode of a trigger with switching inputs to IE8 outputs, the second half of TM generates a full pulse from the transition through 0, the thyristor output is normal.
For irons and other heating devices, it is more expedient to apply a method in which switching on occurs for several periods of the network, then switching off for several periods. Switching on at zero instantaneous value of the mains voltage. The interference from switching on is practically zero.

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