The proposed induction heater circuit exhibits the use of high frequency magnetic induction principles for generating substantial magnitude of heat over a small specified radius.

The discussed induction cooker circuit is truly simple and uses just a few active and passive ordinary components for the required actions.

According to the involved principle when a change in magnetic field is forced around a metal, electrons inside the metals get agitated and begins flowing across the metal, this is termed as eddy current. This flow of current in the metal or the introduced conductor causes a heat to be generated in the metal making it warmer.The generated heat is proportional to (current)^2 x resistance of the metal.

The above heat is also directly proportional to the induced frequency and that's why ordinary iron stamped transformers are not used in high frequency switching applications, instead ferrite materials are used as cores.

However here the above drawback is exploited for acquiring heat from high frequency magnetic induction.

Referring to the proposed induction heater circuit below, we find the concept utilizing the ZVS or zero voltage switching technology for the required triggering of the mosfets. The technology ensures minimum heating of the devices making the operation very efficient and effective.Further to add, the circuit being self resonant by nature automatically gets sets at the resonant frequency of the attached coil and capacitor quite identical to a tank circuit.

The circuit fundamentally makes use of a Royer oscillator which is marked by simplicity and self resonant operating principle. However the main downside of the design is that it employs a center tapped coil as the transformer, which makes the winding implementation a bit trickier. However the center tap allows an efficient push pull effect over the coil through just a couple of active devices such as mosfets.

As can be seen, there are fast recovery or high speed switching diodes connected across the gate/source of each mosfet. These diodes perform the important function of discharging the gate capacitance of the respective mosfets during their non-conducting states thereby making the switching operation snappy and quick.

You can use IRF540 as the mosfets which are rated at good 110V, 33amps. Heatsinks could be used for them, although the heat generated is not to any worrying level, yet still it's better to reinforce them on heat absorbing metals.

The inductor L2 terminating from center of the main induction coil is a kind of choke for eliminating any possible entry of the high frequency content into the power supply and also for restricting the current to safe limits.

Relatively the value of L2 should be high enough, a 2mH will do the job well. However it must be built using high gauge wires for enabling high current usage through it safely.

C1 and L1 constitute the tank circuit here for the interned high resonant frequency latching. Again these too musts be rated to withstand high magnitudes of current and heat.

Here we can see the incorporation of a 330nF/400V metalized PP capacitors.

R1, R2 = 330 ohms 1/2 wattD1, D2 = FR107T1, T2 = IRF540C1 = 2uF/400V made by attaching 6nos 330nF/400V caps in parallel

POWER SUPPLY: Use regulated 15V 20 amp DC power supply.Design of induction cooker for solar powered systemSolar power usage increased now days tremendously in all over the world. Coming to the home application most of the cases using the solar system with battery or with battery Cooking methods have improved tremendously over the years. While many still prefer cooking with LPG stoves and firewood, induction cooking is increasingly becoming more popular now a day. which was created by rectifying the single phase supply by using bridge circuit in case of grid connected systems. If solar power is used, rectification stage is avoided so that cost of the system wills reduces.

The aim of this project is study and design of direct connected solar based induction cooker. To produce substantial magnitude of heat, Induction cookers are required high frequency magnetic field. The circuit fundamentally makes use of a Royer oscillator which is marked by simplicity and self resonant operating principle. zero voltage switching technology for the required triggering of the mosfets. The technology ensures minimum heating of the devices making the operation very efficient and effective.Benefits of Induction CookingInduction is the first technology that offers all of the benefits of cooking with gas, with none of the drawbacks. Until now, gas has always outperformed electric cooking surfaces. A professional chef would have never believed that an electric induction cooktop could be superior to gas ... but now it's a fact, and seeing is believing!

Induction offers the following benefits and performance advantages:

Faster. Because energy is directly transferred within the pan metal, cooking on an electric induction range is extremely fast - even faster than gas. In the foodservice industry time is money, and a faster cooking surface results in shorter preparation time. And we all know what that means ... increased profits!

Safer. Electric induction cooktops are much safer than gas or other electric surfaces, since there is no open flame, red-hot coil or other radiant heat source to ignite fumes or flammable materials.

Cleaner. With no grates or grease catch to worry about, clean up is a breeze. Just use a damp cloth and wipe over the flat, easy-to-clean surface.

Cooler. Traditional gas or electric ranges waste up to (and usually more) than half the heat they generate. The waste heats the kitchen instead of the food and contributes massively to structural cooling costs. With an electric induction range, almost no ambient heat is produced, since all the heat is being generated in the pan itself.

Cheaper. Induction cooking is far more energy efficient than gas or traditional electric ranges. In fact, when using an electric induction cooktop, 90% of every dollar you spend on energy goes right where you want it - in the pan! Gas delivers only 55% to the pan and traditional electric about 65%. In addition, when you remove the pan from the induction cooking surface, the induction cooktop immediately goes into standby mode, which uses almost no energy whatsoever.