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Registered Member #4992
Joined: Wed May 23 2012, 03:57PM
Location:
Posts: 108
Hi everyone! I've build an induction heater based on mindchallenger schematic. Everything works perfect and my mosfets are staying very cool. The only problem is that on high power levels my variac starts to humm allot. At this level my variac is on 75 volts and my tank is pushing 300volts, I don't know what the amps is because I don't have clamp metre. My 3 toroids are turned 5 on primary to 1. If anyone can give some advise it would really help. Thanks.
Registered Member #2099
Joined: Wed Apr 29 2009, 12:22AM
Location: Los Altos, California
Posts: 1716
Furnace:
As Steve Connor implied, it's silly to be building induction heaters with no way to measure their input current. There are several easy, inexpensive wasy to measure AC current without using a clamp meter or a fancy multimeter.
If you put (or build) your AC ammeter on one wire of an extension cord or power strip, then you can measure current without modifying the apparatus under test. You can start by measuring desk lamps and toasters, then plug in your IH's variac.
Category 1. Get an analog or digital panel meter that indicates AC amperes. Or an analog or digital panel meter that indicates DC amperes, and a bridge rectifier.
Category 2. Wire in your own current shunt resistor, and measure the voltage drop. Do you have one or more regular multimeters (digital or analog)? What are the lowest AC voltage and DC voltage ranges? What's your desired AC current range? That'll be our starting point (no time now to write a universal FAQ).
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Humming on my variac
