Electromagnetic heating system and control method and device thereof

Abstract

The invention discloses a control method of an electromagnetic heating system. The control method comprises the steps of acquiring target heating power of the electromagnetic heating system; judging whether the target heating power is less than preset power or not; if the target heating power is less than the preset power, controlling a resonant circuit of the electromagnetic heating system to sequentially enter a discharging stage, a heating stage and a stop stage in each control period, wherein a power switch tube of the resonant circuit is driven through first driving voltage in the discharging stage so as to enable the power switch tube to operate at an amplifying state, so that pulse current of the power switch tube can be suppressed, and a millisecond-level duty ratio heating mode isadopted at the same time so as to realize low-power heating. The invention further discloses a control device of the electromagnetic heating system and an electromagnetic heating system.

Description

technical field [0001] The invention relates to the technical field of household appliances, in particular to a control method of an electromagnetic heating system, a control device of the electromagnetic heating system and an electromagnetic heating system. 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 relationship 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, the problem is that if low power heating is used, such as figure 2 As shown, 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...

AI Technical Summary

Problems solved by technology

However, the problem is that if low power heating is used, such as figure 2 As shown, 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

If used as image 3 The duty cycle method shown achieves low-power heating. The intermittent heating method may affect the cooking function, for example, it is easy to overflow when cooking porridge, which reduces the user's cooking experience.

Images