A control circuit and power control method for an induction cooker adapting to pots of different materials

Abstract

The invention relates to an induction cooker control circuit suitable for cookers of different materials. The induction cooker control circuit comprises an IGBT (Insulated Gate Bipolar Translator), an IGBT driving module, an LC (Launch Control) resonance circuit, a central processing unit, a synchronous sampling circuit and a sampling circuit, wherein the LC resonance circuit is connected with the IGBT, and the central processing unit is connected with the IGBT driving module; the synchronous sampling circuit is electrically connected with the LC resonance circuit; and the sampling circuit is connected with the central processing unit and provides current and voltage signals. The control circuit also comprises a resonance frequency sampling circuit which is used for sampling a resonance frequency generated when the cookers of different materials work. The sampling point of the resonance frequency sampling circuit is arranged at the output end of the synchronous sampling circuit, and the output end of the resonance frequency sampling circuit is connected with the central processing unit. The output power and a power preset value are compared and the collected resonance frequency and a resonance frequency preset value are compared to judge whether the resonance frequency is beyond the resonance frequency range of safe working of an induction cooker or not. The output power of an electromagnetic coil is adjusted through the IGBT, so that a main loop working current works in a rated range, and therefore the safe working of the induction cooker is protected.

Description

technical field [0001] The invention relates to the field of kitchen cooking utensils, in particular to a control circuit and a power control method for an electromagnetic cooker of pots made of different materials. Background technique [0002] As a kitchen utensil widely used in kitchen appliances, the induction cooker generally adopts the iron pot configured by the manufacturer to heat the ingredients. In actual use, due to the diversity of user choices, other pots that are not used by the manufacturer are often used. Material pots and utensils, such as 4 series stainless steel pots replaced by 2 series stainless steel pots, or directly replaced by aluminum pots, at this time, the average operating current of IGBTs and reels will increase significantly due to different pots and pans, and even exceed the design rated current, resulting in circuit boards, The wire reel and IGBT are seriously overheated, and even burn the circuit board, wire reel, or IGBT. However, in the p...

AI Technical Summary

Problems solved by technology

Therefore, when the user is using it, the power of the induction cooker will not match, which will reduce the working efficiency of the induction cooker and even cause the burnout phenomenon.

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