Electromagnetic heating system and switching tube opening control device and method thereof

Abstract

The invention discloses an electromagnetic heating system and a switch-on control device and method of a switching tube thereof. The electromagnetic heating system comprises a resonant circuit and a driving circuit, wherein the resonant circuit comprises a heating coil, a resonant capacitor and a switching tube, and the driving circuit drives the switching tube. The switch-on control device comprises a current detection circuit and a master control unit, the current detection circuit is connected with an emitter of the switching tube and is used for detecting an instantaneous current passing through the switching tube, the master control unit is connected with the driving circuit and the current detection circuit respectively and is used for adjusting heating power of the electromagnetic heating system according to the instantaneous current passing through the switching tube so that the switching tube conforms to a preset switch-on requirement, the switching tube can be intelligently adjusted to be switched on under the preset switch-on requirement, different cookwares can be adapted very well, the demand of a user is satisfied, and moreover, the switching tube can be prevented from generating heat even being damaged due to switch-on in advance or behind.

Description

technical field [0001] The invention relates to the technical field of household electrical appliances, in particular to an opening control device for a switch tube in an electromagnetic heating system, an electromagnetic heating system, and a method for controlling the opening of a switch tube in the electromagnetic heating system. Background technique [0002] The most ideal state when the IGBT tube is turned on is that Uce' (the voltage between the collector and emitter of the IGBT tube) is zero and the reverse freewheeling current is also zero, but due to the limitations of actual conditions, Uce' is in many cases Neither can oscillate to zero. The smaller the heating power, the harder it is for Uce' to oscillate to zero. At this time, the IGBT is turned on in advance; the reverse freewheeling current is also difficult to be zero in many cases. The larger the heating power, the reverse freewheeling current The larger the current may be, the opening at this time is hyster...

AI Technical Summary

Problems solved by technology

However, its disadvantage is that Uce' and reverse freewheeling current can only be adjusted to the preset range when using known cookware, and for some unknown cookers, it is impossible to guarantee that Uce' and reverse freewheeling current are both In the preset range, this may cause the IGBT tube to overheat and even cause damage

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