Method and device for abnormal overvoltage protection of power switch tube in electromagnetic heating cooking system

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 protecting a power switch tube from overvoltage abnormality in an electromagnetic heating cooking system, a device for protecting a power switch tube from overvoltage abnormality in an electromagnetic heating cooking system, and an electromagnetic heating cooking system. Background technique [0002] In general, the electromagnetic heating cooking system is equipped with an overvoltage protection mechanism for the power switch tube, that is, when the resonant voltage exceeds the set protection voltage threshold, the overvoltage interruption is triggered, and the PPG (Programme Pulse Generator, pulse program occurs) device) control module reduces the current PPG value to reduce the working back pressure of the power switch tube. [0003] However, triggering the overvoltage abnormal protection mechanism of the power switch tube will reduce the working powe...

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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

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