Electromagnetic heating cooking system and drive chip of power switch tube of electromagnetic heating cooking system

Abstract

The invention discloses an electromagnetic heating cooking system and a drive chip of a power switch tube of the electromagnetic heating cooking system. The drive chip comprises a current signal receiving end connected with a current sampling unit for receiving a current sampling signal generated by the current sampling unit according to current flowing through a power switch tube, a signal amplifier unit connected with the current signal receiving end for carrying out amplifying processing on the current sampling signal, an overcurrent protection unit connected with the signal amplifier unitfor generating an overcurrent protection signal according to the amplified current sampling signal, a control signal receiving end connected with a control chip for receiving a control signal output by the control chip, and a drive unit connected with the power switch tube, the control signal receiving end and the overcurrent protection unit separately for driving on or off of the power switch tube according to the control signal and driving off of the power switch tube when an overcurrent protection signal is received. Therefore, an overcurrent protection function is integrated into the drivechip, so that burnout of the power switch tube caused by over-high current can be prevented.

Description

technical field [0001] The invention relates to the technical field of electrical appliances, in particular to a drive chip for a power switch tube in an electromagnetic heating cooking system and an electromagnetic heating cooking system with the same. Background technique [0002] Electromagnetic heating devices in the related art, such as induction cookers, usually connect the constantan wire in series between the E pole of the IGBT and the ground, and convert the working current signal of the IGBT into a voltage signal through the constantan wire, and then the built-in operational amplifier of the main control chip The voltage signal is amplified, and AD sampling is performed to obtain the current AD value of the IGBT. At the same time, the main control chip judges whether the current exceeds the limit value according to the current AD value, and enters the over-current protection processing program when it exceeds the limit value. [0003] However, the disadvantage of ...

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Problems solved by technology

[0003] However, the disadvantage of the related technology is that when reading the AD value of the current, the main control chip performs corresponding software filtering processing, for example, adopts the filtering method of calculating the average value by summing multiple times. Judging the over-current state, there is the problem of inaccurate and untimely judgment of over-current

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