Induction cooking is performed using direct induction heating of cooking vessels , rather than relying on indirect radiation , convection , or thermal conduction. Induction cooking allows high power and very rapid increases in temperature to be achieved, and changes in heat settings are instantaneous. In an induction cooktop "induction hob" or "induction stove" , a coil of copper wire is placed under the cooking pot and an alternating electric current is passed through it. The resulting oscillating magnetic field wirelessly induces an electrical current in the pot. This large eddy current flowing through the resistance of the pot results in resistive heating.
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The induction cooking craze has been getting lots of buzz even though the technology has been around for about a century. Induction cooktop is quiet popular, both in domestic and commercial usage. They are considered as one of the advanced technological innovations in the field of cooking. Induction cooktops, are relatively new to many regions in emerging Asia-Pacific economies.
The induction cooktops market is expected to see rise at a fast pace. This is due to growing awareness and rapid urbanization in Asia-Pacific and Eastern Europe regions. Induction Cooking is a type of electric cooking that uses magnetic coils to heat cookware. The beauty of the induction cooking is that the cooking surface itself remain cool while heat is generated within the cookware. Cooking by means of induction cooktop is quick and highly energy efficient as compared to other conventional methods; on top of it lack of open flame makes them safer too.
Electromagnetic induction principle was discovered long back in by Michael Faraday. Electromagnetic induction refers to a phenomenon by which electric current is generated in a closed circuit by the fluctuation of current in another circuit placed next to it.
Below ceramic or glass surface lies a resonant coil as shown in Figure 1. The induction cooktop and cookware can be considered as a transformer in which cookware act as shorted secondary load. An alternating is made to flow through the resonant coil, which leads to generation of oscillating magnetic field.
The magnetic field induces an electric currents inside the cookware. The induction cooktop only works with cookware made of certain materials that have specific properties. In order to be heated by the magnetic field, the cookware has to be made of a ferromagnetic material, such as stainless steel or iron.
Unlike a gas burner or electrical stove, the induction cooktop is incapable of producing heat on its own. In case, the induction cooker is made to operate while no cookware present on top of it or the cookware is removed while induction cooktop is in operation then the resonant coil sees as if there is no load open circuit and there will be no energy transfer.
In case of no cookware the induction cooktop enters into sleep mode to have minimum standby power consumption i. Generally, semiconductor devices are used as switching element in various power converters. Insulated gated bipolar transistor IGBT are used in induction cooking systems. In soft switching the voltage or current is manipulated to become zero across the resonant switch, at the moment of switching.
Soft switching can be further categorized in two methods i. ZVS and ZCS switching technique methods has its pros and cons and also there use case is application specific. The voltage or current administered to the switching circuit can be made zero by using the resonance created by an L-C resonant circuit.
The induction cooktop works on the principle of a LC resonant converter. This causes the system to have an oscillating resonant frequency. In order to control the power delivery of the system i. Can I just remove the rectifier part and do that? Sign in Join. Sign in. Log into your account. Sign up. Password recovery. Friday, June 5, Advertise Contact About Magazine. Forgot your password? Get help. Create an account. Electronics For You. Home Resources Basics. Resources Basics.
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Induction cooking heats a cooking vessel by electrical induction, instead of by thermal conduction from a flame, or an electrical heating element. The cooking vessel must be made of or contain a ferromagnetic metal such as cast iron or stainless steel. Heat is coming from within the pan, making this method of cooking a lot more efficient. You therefore need to ensure that your pans are suitable to use on an induction hob. Copper or aluminium pans would not work unless they have additional layers added onto the bottom that are magnetic.
Understanding How Modern Induction Cookers Work
A magnetic field is generated by a volt, toamp, tokHz-frequency electric current from a or amp breaker through a copper coil. The magnetic field acts as a bridge, linking the electric current in the copper coils with eddy currents induced in ferromagnetic cookware. Magnets pull otherwise randomly distributed electrons in a consistent direction. The magnetic field sets the pan's electrons into organized motions known as eddy currents. The currents generate heat in the pan walls. Resistance to electron flow is higher in the cookware than in copper.