Pan detection method and detection device for cooking utensils

Abstract

The invention provides a cookware detection method and device used for a cooking utensil. The cooling utensil comprises a resonance circuit, a transistor switch and a power supply module, wherein the resonance circuit is composed of a heating coil and a resonance capacitor, and the resonance circuit, the transistor switch and the power supply module are connected in series. The cooking utensil further comprises a mutual inductor and a signal sampling circuit, wherein the mutual inductor is connected with the heating coil in series, the signal sampling circuit is connected with a secondary circuit of the mutual inductor. The cookware detection method includes the steps of controlling the transistor switch to enter a turned-off state after the transistor switch is turned on for the first preset duration, collecting current signals in the secondary circuit of the mutual inductor and / or the oscillation frequency of current in the secondary circuit of the mutual inductor after the transistor switch enters the turned-off state for the second preset duration, and judging whether cookware is placed on the cooking utensil or not according to the magnitude of the current signal and / or the magnitude of the oscillation frequency. According to the technical scheme, time spent on cookware detection can be shortened, energy consumed by cookware detection is reduced, and the complexity of a detection circuit is lowered.

Description

technical field [0001] The present invention relates to the technical field of cooking utensils, in particular to a pan detection method for cooking utensils and a pan detection device for cooking utensils. Background technique [0002] In the field of electromagnetic heating, the induction cooker can detect whether a pan is placed through the pan detection function. The quality of the pot inspection method directly affects the noise, detection time and accuracy of the pot inspection process, which in turn will affect the user's physical examination of the product. The key to the pot detection technology is to detect the difference of the electrical signal in the resonant circuit with and without the pot, and convert the difference into quantitative data through certain technical means to make a judgment. [0003] The existing pot detection methods are mainly divided into the following two types: [0004] Current detection, the current detection is mainly to sample the cur...

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Problems solved by technology

[0006] However, the above-mentioned current pot detection scheme has disadvantages such as long detection time and high energy consumption; while the pulse detection scheme has complex circuit schemes, low circuit utilization (only for pot detection), and poor versatility (can only use It is suitable for testing the circuit scheme of single IGBT, and cannot be used for testing the circuit scheme of double IGBT), etc.

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