AC fan speed control by periodic on/off switching

I have a fan (110 V AC) that I want to control the speed of.

I want to do this by periodically switching it on/off. Say, period of
about 5 seconds; and the 'on' period can be controlled as 10-100% of
this time. I already have a fan that has this built in, and it works
great, silent too. Basically it's variable pulse width control of an
AC appliance.

I probably need a thyristor / triac circuit for this, switching on the
null-crossings. Would be nice if the period time could also be
variable.

Searches on Google failed because I don't know what keywords to look
for. Can someone help me out?

Thanks,
E.

.

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