Electromagnetic heating circuit, and electromagnetic heater and current regulation method

A technology for heating circuits and heating appliances, applied in the field of induction cookers, can solve problems such as damage to IGBT modules, excessive drain-source current, etc.
CN109982467APending Publication Date: 2019-07-05ZHEJIANG SHAOXING SUPOR DOMESTIC ELECTRICAL APPLIANCE CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG SHAOXING SUPOR DOMESTIC ELECTRICAL APPLIANCE CO LTD
Publication Date
2019-07-05

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Abstract

The invention provides an electromagnetic heating circuit (100), an electromagnetic heater (10) and a current regulation method. The electromagnetic heating circuit (100) comprises a micro-processingunit (101), a level conversion circuit (102), a waveform conversion circuit (103), a push-pull circuit (104) and an IGBT module (105). The first output end of the micro-processing unit (101) is connected with the level conversion circuit (102), the second output end of the micro-processing unit (101) is connected with the waveform conversion circuit (103), the input end of the push-pull circuit (104) is connected with the level conversion circuit (102) and the waveform conversion circuit (103), the output end of the push-pull circuit (104) is connected with the gate of the IGBT module (105), and the micro-processing unit (101) controls on-off of the waveform conversion circuit (103), so that the instantaneous current of the IGBT module (105) is greatly reduced when the electromagnetic heater (10) works, and the working condition of the IGBT module (105) is improved.
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Description

Technical field

[0001] The present invention relates to the technical field of electromagnetic ovens, in particular to an electromagnetic heating circuit, an electromagnetic heating appliance and a current adjustment method. Background technique

[0002] The electromagnetic heating circuit can use the principle of electromagnetic induction to convert electrical energy into heat energy to heat the equipment to be heated. The electromagnetic heating circuit has a wide range of applications, such as electric rice cookers, electric pressure cookers, soymilk machines, coffee machines, blenders and other electromagnetic heating appliances that require heating functions.

[0003] Generally, when the electromagnetic heating device is heated with high power, in the existing electromagnetic heating circuit, when the voltage on the drain of the insulated gate bipolar transistor (IGBT) module crosses zero, the IGBT module is turned on. The current of the IGBT module is very small. However, w...

Claims

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