Electromagnetic heating equipment, electromagnetic heating system and heating control method and device thereof

Abstract

Disclosed in the present invention are an electromagnetic heating device, an electromagnetic heating system, and a heating control method and apparatus therefor. The method comprises the following steps: acquiring a target heating power of the electromagnetic heating system; determining whether the target heating power is less than a preset power; if the target heating power is less than the preset power, controlling, in each control period, the electromagnetic heating system to enter a discharge phase, a heating phase, and a stop phase in sequence: in the discharge phase, providing a plurality of first pulse signals to a power switch tube of a resonance circuit, and in the heating phase, providing a plurality of second pulse signals to the power switch tube, the amplitude value of the first pulse signals being a first drive voltage, the amplitude value of the second pulse signals being a second drive voltage, and the first drive voltage being less than the second drive voltage. Therefore, by means of pre-discharging, the present invention is able to suppress the pulse current of the power switch tube, thereby achieving low-power heating with millisecond duty cycle.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a heating control method for an electromagnetic heating system, a heating control device for an electromagnetic heating system, an electromagnetic heating system and an electromagnetic heating device. Background technique [0002] In related technologies, the electromagnetic resonance circuit of a single IGBT usually adopts a parallel resonance mode, and the resonance parameters are set on the premise of realizing high-power operation, such as figure 1 As shown, when heating with high power, due to the matching of resonance parameters, the leading voltage when the IGBT is turned on is very small, and the pulse current of the IGBT is also very small. However, if figure 2 As shown, when low-power heating is used, the leading voltage of the IGBT is very high, resulting in a very large pulse current of the IGBT, which is particularly easy to exceed the use limit of the...

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Problems solved by technology

However, if figure 2 As shown, when heating with low power, the leading voltage of the IGBT is very high, resulting in a very large pulse current of the IGBT, which is particularly easy to exceed the use limit of the IGBT and damage the IGBT

[0003] In order to achieve low power, related technologies usually adopt such as image 3 The shown duty ratio mode is used for intermittent heating, for example, by heating for 5 seconds and stopping for 5 seconds to achieve a low power of 5 / 10. However, the problem in related technologies is that if the intermittent heating cycle is long, the cooking function will be affected, such as It is easy to overflow when cooking porridge, which will reduce the user's cooking experience. If the intermittent heating cycle is short, it will cause the IGBT to be hard turned on, which will lead to a very large pulse current of the IGBT and serious noise.

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