Induction cooker continuous low power control circuit and control method

Abstract

The invention belongs to the induction cooker technical field, and specifically relates to an induction cooker continuous low power control circuit and a control method; the structure scheme can be implemented in a simple mode; the control circuit comprises a full wave rectification and filter; a transduction coil and a resonant capacitor are connected in parallel to form an LC resonance circuit; one end of the LC resonance circuit is connected with the positive end of the full wave rectification and filter, and the other end of the LC resonance circuit is connected with an IGBT collector electrode; an IGBT emitter electrode is connected with the negative end of the full wave rectification and filter, thus forming a current loop; the IGBT conduction time can be properly controlled, thus forming an electromagnetic heating device. In each T-on +T-lc period, a T-ext time period is added after the T-lc, so the period of the electromagnetic wave emitted by the induction cooker is T-on + T-lc + T-ext. T-on can be increased in a large power condition, and can be reduced when low power is needed; when T-on reaches the T-lc, the T-on is fixed, and the T-ext is imported, thus adjusting the T-ext so as to continuously adjusting the power rate. The control circuit and method can adjust the induction cooker power at will for cooking, thus allowing users to obtain the practical effect of using an open fire cook mode when the induction cooker is used.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic ovens, and specifically refers to a continuous low-power control circuit and a control method for an electromagnetic oven. Background technique [0002] The transduction coil of the induction cooker is connected in parallel with the resonant capacitor to form an LC resonant circuit, and the LC resonant circuit is connected to the IGBT driving the converter. When the IGBT is turned on and off at the appropriate time, the energy passes through the transducing coil of the LC resonant circuit, and is directly transmitted to the iron cooking utensils by electromagnetic waves. [0003] Low-cost electromagnetic heating devices (induction cooker) generally use LC inductor-capacitor parallel resonant circuit as the management of the working sequence. [0004] The transducing coil L and the resonant capacitor C are connected in parallel to form an LC resonant circuit, and the LC resonant circuit is...

AI Technical Summary

Problems solved by technology

[0010] The core design shortcomings of low-cost electromagnetic heating devices are known to many users. The most obvious is that they cannot provide low power stability. The low power provided is only achieved by switching high power in time ratios. The situation where the water rolls and stops

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