Overvoltage abnormal protection method and device for power switch tube in electromagnetic heating cooking system

A power switch tube and abnormal protection technology, applied in the direction of induction heating, induction heating control, etc., can solve the problems of unable to meet the power requirements, extremely serious back pressure of the power switch tube, long opening width of the power switch tube, etc.

Active Publication Date: 2018-01-05
FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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Problems solved by technology

[0004] However, when some electromagnetic heating cooking equipment works in a harsh environment, the back pressure of the power switch tube is extremely serious, even if the PPG value is increased to limit the PPG width, the power requirement cannot be met
In this case, the power switch tube will bear a very long turn-on width and a long-term high collector voltage, which will easily cause damage to the power switch tube, and there are great hidden dangers

Method used

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  • Overvoltage abnormal protection method and device for power switch tube in electromagnetic heating cooking system
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  • Overvoltage abnormal protection method and device for power switch tube in electromagnetic heating cooking system

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[0026] The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, and are intended to explain the present invention and should not be construed as limiting the present invention.

[0027] The following describes an abnormal overvoltage protection method for a power switch tube in an electromagnetic heating cooking system, an overvoltage abnormality protection device for a power switch tube in an electromagnetic heating cooking system, and an electromagnetic heating cooking system proposed by embodiments of the present invention with reference to the accompanying drawings.

[0028] figure 1 It is a flow chart of a method for overvoltage abnormal protection of a powe...

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Abstract

The invention discloses an electromagnetic heating cooking system, and an overvoltage abnormal protection method and device for a power switch tube in the electromagnetic heating cooking system. The overvoltage abnormal protection method comprises the following steps: judging whether the power switch tube is in an abnormal state; if the power switch tube is in an abnormal state, a timer is controlled to count and the number of overvoltage times of the power switch tube is counted through a counter; and when the count time of the timer reaches a preset time threshold, if the count value of thecounter exceeds a preset number of times threshold, the target power value of the electromagnetic heating cooking system is reduced according to a preset step length. The method can protect the powerswitch tube to some extent by reducing the target power value of the electromagnetic heating cooking system and reducing the overvoltage degree of the power switch tube when the power switch tube is in an abnormal state.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a method for overvoltage abnormality protection of a power switch tube in an electromagnetic heating cooking system, an overvoltage abnormality protection device for a power switch tube in an electromagnetic heating cooking system, and an electromagnetic heating cooking system. Background technique [0002] Under normal circumstances, the electromagnetic heating cooking system is equipped with an abnormal overvoltage protection mechanism for the power switch tube, that is, when the resonant voltage exceeds the set protection voltage threshold, an overvoltage interrupt is triggered, and the PPG (Programme Pulse Generator, pulse program occurs) The controller) control module reduces the current PPG value to reduce the working back pressure of the power switch tube. [0003] However, the overvoltage abnormal protection mechanism that triggers the power switch tube will ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06
Inventor 宣龙健汪钊卢伟杰李睿
Owner FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD
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