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

Abstract

The invention discloses an electromagnetic heating device, an electromagnetic heating system and a heating control method and device thereof. The method comprises the following steps: obtaining the target heating power of the electromagnetic heating system; judging whether the target heating power is less than the preset power; if the target heating power is less than Preset power, then in each control cycle, the electromagnetic heating system is controlled to enter the discharge phase, the heating phase and the stop phase in turn, wherein, in the discharge phase, a plurality of first pulse signals are provided to the power switch tube of the resonant circuit of the electromagnetic heating system, And provide a plurality of second pulse signals to the power switch tube in the heating stage, the amplitude of the first pulse signal is switched between the first driving voltage and the second driving voltage, and the amplitude of the first first pulse signal is the second For the driving voltage, the amplitude of the second pulse signal remains at the second driving voltage, and the first driving voltage is smaller than the second driving voltage. Therefore, the pulse current of the power switch tube can be suppressed, and low-power heating with a very millisecond duty cycle can be realized.

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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