Induction heating circuit and winding method for heating coils

Induction Heating Circuit and Winding Method for Heating Coils

Induction heating circuits are gaining popularity for their efficiency and effectiveness in heating applications. These circuits use electromechanical energy to heat conductive materials without direct contact, making them ideal for various cooking tools like rice cookers. The technology leverages high-frequency alternating current to induce heat in coils, which is then transferred to the cooking vessel. Notably, adaptation of winding methods and circuit designs, such as the push-pull converter type, are integral to enhancing these heating applications.

Background of the Invention

The focus of this invention is centered around an induction heating circuit suitable for cooking appliances, specifically rice cookers. The design features a housing that encapsulates a metal bowl, a heating coil, and ceramic insulation positioned between the heating coil and the metal bowl.

Various circuits generate high-frequency AC voltage on the heating coil. Circuits like the half-bridge converter utilize two power transistors, while a class-E converter typically employs a single power transistor, resulting in lower manufacturing costs. Conversely, the push-pull converter, although more complex in terms of heating coil design, proves to be more efficient for heating applications.

Heating bowls are commonly structured with dual metal layers: an inner aluminum layer and an outer iron layer to augment the overall resistance. The outer iron layer is vital as it stabilizes the circuit's operation, particularly for class-E converters, whereas push-pull converters can function effectively with lower resistance materials.

Summary of the Invention

This invention proposes a heating circuit utilizing a push-pull converter type circuit that integrates new winding techniques for heating coils, allowing for a more economical production process. By doing so, it enables the use of a single-layer conductive bowl, reducing manufacturing expenses significantly.

Heating Circuit Description

According to one embodiment, the heating circuit consists of a voltage source, two coils configured to heat a conductive bowl, and capacitors and switches arranged to facilitate this heating process. The heating coils should share symmetry in their shape and geometry to maintain uniform inductance, allowing them to align effectively when repositioned.

Inductive Heating Mechanism

In this unique system, the circuit configuration allows the coils to function as a transformer, with the inductive heating transferring the electromagnetic energy efficiently to the single-layer conductive bowl, primarily constructed from aluminum.

Winding Methods for Heating Coils

The invention encompasses two notable winding methods for the heating coils aimed at creating an efficient symmetrical center-tap transformer. The first method involves overlapping coils designed in a circular manner, ensuring they maintain similar shape and inductance properties. The second method wraps the coils without overlap, emphasizing their alignment to achieve a similar heating effect across the system.

Conclusion

This technology showcases significant advancements in induction heating circuits tailored for cooking appliances. The noted winding strategies and the incorporation of adequate circuit types lead to improved efficiency and reduced costs, providing a compelling solution for modern cooking devices.

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