Electromagnetic cooker and filter circuit for electromagnetic cooker and control method thereof

Abstract

The invention discloses a filter circuit for an induction cooker. The filter circuit comprises N inductors, M capacitors, a controllable switching network and a controller, wherein the N inductors are connected in series with each other, and the first end of the first inductor is connected with a first AC input end, the second end of the Nth inductor is connected with a first AC output end, and (N+1) nodes are arranged between the first AC input end, the N inductors and the first AC output end; the first ends of the M capacitors are connected with Q nodes among the (N+1) nodes, while the second ends of the M capacitors are connected with the second AC input end; the controllable switching network is used for controlling partial inductors among the N inductors and partial capacitors among the M capacitors; the controller is connected with the controllable switching network, and used for selecting capacitors and inductors to work by controlling the controllable switching network. The filter circuit is capable of adjusting the cut-off frequency along with the working frequencies of different pots to achieve the optimal filter effect. The invention also discloses an induction cooker and a control method of the filter circuit.

Description

Technical field [0001] The invention relates to the technical field of household appliances, in particular to a filter circuit for an induction cooker, an induction cooker and a control method for the filter circuit for an induction cooker. Background technique [0002] Most of the existing filter circuits of induction cookers that meet the EMC (Electro Magnetic Compatibility) test requirements use an LC filter circuit or a π-type filter circuit, that is, only one filter capacitor and one filter inductor or two filter capacitors And a filter inductor. [0003] The disadvantage of the prior art is that after the element parameters of the LC or π-type filter circuit are determined, only one cut-off frequency can be effectively filtered. However, pots of different materials have different working frequencies. For EMC testing, when the working frequency of the pot and the cut-off frequency of the filter circuit are equal, the test is qualified; when the difference is large, the test i...

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