With the increase in demand for cooking gas day by day and increase in fuel price, people are looking forward for alternatives. Fire wood is no more an acceptable solution because of the pollution issues. Induction based cooking system is pollution free and efficient but it consumes too much electrical energy which makes it less economical. People are looking forward to an economical, efficient and pollution free options. Here is how solar based induction cooking system finds its place. The solar energy is available in abundance and over 90% of is not been utilized.
A solar based induction cooking system is pollution free and efficient. Initial cost is the only expense as there is literally no operating cost which makes it economical. Since the solar energy is available throughout the day the system is efficient.
Solar Induction Heater Schematic Representation
The solar based induction heater has a solar panel to tap the solar energy and a tracking circuit for tracking the maximum power point or maximum solar energy point. The photovoltaic cells in the solar panel convert the solar energy in to electrical energy. The electrical energy available from the photovoltaic cells is in the form of direct current. The DC voltage must be regulated and converted to the supply voltage for the Induction heater. Next stage is the inverter stage where the DC voltage is converted into an oscillating voltage of high frequency using an oscillating circuit. The solar induction heater is well enough to cook one day meal, boiling water and making tea.
Solar Induction heater has mainly two sections ‘Supply Unit’ and ‘Heater Unit’. The Supply unit consists of two parts; solar panel and converter circuit. The heater unit consists of oscillator circuit and heating section.
The solar panel is of low power rating that is well enough to produce 30v to 45v and current rating 10A to 20A. The output of the solar module is fed to the converter circuit. A solar module of 600W can serve the purpose satisfactorily.
The converter circuit steps down the voltage to a lower value which is needed for the induction heating unit. This can be achieved using a buck converter which outputs a constant 24V DC.
The oscillator circuit transforms the 24V DC supplied from the converter circuit to an oscillating voltage of high frequency. This is then filtered to prevent DC components in the voltage and also to prevent from over current condition which may damage the coil.
The heater section consists of a tank capacitor circuit and a heating element. The heating element is made of bare copper conductor which produces the heating action when the oscillating voltage is passed through it. A heat resistant glass ceramic sheet is placed above the coil. As the coil heats up the vessel placed above the glass ceramic sheet heats up.