Electromagnetic heating system and switch-on control device and method of switching tube

Abstract

The invention discloses an electromagnetic heating system and a switch-on control device and method of a switching tube. 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 is used for driving the switching tube. The switch-on control device comprises a voltage detection circuit and a master control unit, the voltage detection circuit is connected with a collector of the switching tube and is used for detecting instantaneous voltages of two ends of the collector and an emitter of the switching tube, the master control unit is connected with the driving circuit and the voltage detection circuit and is used for adjusting heating power of the electromagnetic heating system according to the instantaneous voltages of the two ends of the collector and the emitter of the switching tube, so that the preset switch-on requirement of the switching tube is satisfied, the switching tube is intelligently adjusted under the preset switch-on requirement to be switched on, different pans are adapted well, the demand of a user is satisfied, and moreover, the switching tube can be prevented from being heated or even damaged since switch-on of the switching tube is performed in advance or delayed.

Description

Technical field [0001] The present invention relates to the technical field of household appliances, in particular to an on-off control device of a switch tube in an electromagnetic heating system, an electromagnetic heating system, and a switch-on control method in an electromagnetic heating system. Background technique [0002] In an electromagnetic heating system such as an induction cooker, the most ideal state when the power switch IGBT tube is turned on is that Uce' (the voltage between the collector and the emitter of the IGBT tube) is zero and the reverse freewheeling current is also zero, but due to actual Due to the limitation of conditions, Uce' cannot oscillate to zero in many cases, especially the smaller the heating power, the more difficult it is for Uce' to oscillate to zero. At this time, turning on the IGBT is a leading turn on; the reverse freewheeling current is also very high in many cases. It is difficult to be zero. The greater the heating power, the greate...

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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