Ferromagnetic Based Flame-Less Cooking System Using Induction Heating Method with User

FERROMAGNETIC BASED FLAME-LESS COOKING SYSTEM USING INDUCTION HEATING METHOD WITH USER SELECTABLE TEMPERATURE SETTING SYSTEM Technical Specifications:

Title of the project : Ferromagnetic based Flame-less cooking system using

Induction heating method with user selectable temperature

setting system.

Domain : Embedded Systems

Software : Embedded C, Keil, Proload

Microcontroller : AT89S52

Display : LCD

Control Switch Array : 4 Switches

RTC Unit : DS1307

Back-Up Battery : 3v

Power Supply : 5V, 750mA Regulated Power Supply

Crystal : 11.0592MHz

Induction generating plates : 1

Applications : House hold , offices, industries.

Developed By : M/S Wine Yard Technologies

Phone : 040-6464 6363, www.WineYard.in Abstract:

Ferromagnetic based flameless cooking is based on induction heating to directly heat a cooking vessel, as opposed to using heat transfer from electrical coils or burning gas as with a traditional cooking stove. To be used on an induction cooktop, a cooking vessel must be made of a ferromagnetic metal, or placed on an interface disk which enables non-induction cookware to be used on induction surface.

In an induction cooker, a coil of copper wire is placed underneath the cooking pot. An alternating electric current flows through the coil, which produces an oscillating magnetic field. This field induces an electric current in the pot. Current flowing in the metal pot produces resistive heating which heats the food. While the current is large, it is produced by a low voltage. An induction cooker transfers electrical energy by induction from a coil of wire into a metal vessel that must be ferromagnetic. The coil is mounted under the cooking surface, and a large alternating current is passed through it. The current creates a changing magnetic field. When an electrically conductive pot is brought close to the cooking surface, the magnetic field induces an electrical current, called an "eddy current", in the pot. The eddy current, flowing through the electrical resistance, produces heat; the pot gets hot and heats its contents by heat conduction.

Use of embedded technology makes this system efficient and reliable. Micro controller

(AT89S52) allows dynamic and faster control. Liquid crystal display (LCD) makes the system user-friendly. AT89S52 micro controller is the heart of the circuit as it controls all the functions.

The system is provided with a control switch array according to user requirement the device can made ON to cook food placed on these induction generating plates. This is a best example for flameless cooking system. This system switches on the flameless induction cooking system only at preprogrammed timings. As the DS1307 Real Time Clock chip with battery back-up is used, there will be no disturbances for the programmed on/off timings even in power failures.

Control switches are provided for entering the required timings. LCD display is provided to display the alarm times and current time. DS1307 is interfaced to the microcontroller for real timing performance. A 3V battery can be connected to DS1307 to avoid time disturbances caused by power failures.

DS1307 has inbuilt flash EEPROM. Data stored remains in the memory even after power failure, as the memory ensures reading of the latest saved settings by the micro controller. If the programmed time duration is completed it indicates with a buzzer indication.

This circuit uses regulated 5V, 750mA power supply. 7805 three terminal voltage regulator is used for voltage regulation. Bridge type full wave rectifier is used to rectify the ac output of secondary of 230/18V step down transformer. Block Diagram:

Contrast

16X2 LCD

Control Switch Driver Relay/Traic Circuit

Back-up AT89S52 MCU Battery AT89S52 MCU InductionInduction plateplate

DS1307

Crystal

Crystal Transistor Crystal Transistor Buzzer Driver circuitcircuit

Bridge StepStep Filter Regulator Rectifier down Circuit Rectifier down Circuit Power supply to all sections T/F APPLICATIONS:

 The disadvantage of inductive charging is its lower efficiency and increased resistive heating in comparison to direct contact.

 Inductive charging also requires drive electronics and coils that increase manufacturing complexity and cost.

 These technologies provide charging time that are the same as wired approaches and are finding their way into mobile devices rapidly. ADVANTAGES:

 Inductive charging carries a far lower risk of electrical shock, when compared with conductive charging, because there are no exposed conductors.

 The ability to fully enclose the charging connection also makes the approach attractive where water impermeability is required; for instance, inductive charging is used for implanted medical devices that require periodic or even constant external power, and for electric hygiene devices, such as toothbrushes and shavers, that are frequently used near or even in water.

 Inductive charging makes charging mobile devices and electric vehicles more convenient; rather than having to connect a power cable, the unit can be placed on or close to a charge plate.