Failure detection method and device for electromagnetic heating system and resonant capacitor thereof

Abstract

The invention discloses a failure detection method of a resonant capacitor in an electromagnetic heating system. The method comprises the following steps of S1, according to a received heating instruction, outputting a control signal to a driving unit, and driving an IGBT pipe through the driving unit so as to make a resonance circuit carry out resonance heating work; S2, according to a voltage of two ends of the resonance circuit, generating a pulse signal, and according to the pulse signal, acquiring a feedback pulse counting value; S3, according to the control signal output to the driving unit, acquiring a resonance pulse counting value, and according to the feedback pulse counting value and the resonance pulse counting value, determining whether a capacitor which is participated in resonance is failed in the resonance circuit. By using the failure detection method, changes of the resonant capacitor can be acquired in real time so that corresponding protection measures are performed when the resonant capacitor is failed and system safety is increased. The invention also discloses a failure detection apparatus of the resonant capacitor in the electromagnetic heating system and the electromagnetic heating system.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a method for detecting failure of a resonant capacitor in an electromagnetic heating system, a device for detecting failure of a resonant capacitor in an electromagnetic heating system, and an electromagnetic heating system. Background technique [0002] At present, the resonant circuit of the single-tube induction cooker adopts a parallel resonance method. When the single-tube induction cooker operates continuously at low power, the resonant frequency is increased by reducing the size of the resonant capacitor, so as to reduce the leading conduction voltage of the IGBT tube during low-power operation. Heating, and when the single-tube induction cooker is running at high power, a large-capacity resonant capacitor is used for resonant heating. [0003] However, if a large-capacity resonant capacitor is used for resonant heating when the single-tube induction cooker is...

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Problems solved by technology

[0003] However, if a large-capacity resonant capacitor is used for resonant heating when the single-tube induction cooker is continuously operating at low power, the leading conduction voltage of the IGBT tube will be greatly increased, resulting in heat damage to the IGBT tube; if the single-tube induction cooker is operated at high power When using a small-capacity resonant capacitor for resonant heating, the IGBT tube will be damaged due to excessive collector voltage

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