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Why is there any reaction in the industry that electromagnetic heating is not easy to use and easy to fail?

Author: Zhongshan Shengchi Electronic Technology Co., Ltd.: professional knowledge release: 2019-01-03 01:41:02 reading: (875)
Abstract:

Recently, customers often talk about a problem: electromagnetic induction heater is not easy to use, interfere with, and easy to break, and so on.
At first, the technology of civil induction cooker is used for reference. The civil induction cooker is a single station, so there is no interference of magnetic line of force when multiple units are used, and the single continuous heating time is relatively short. Therefore, the single tube mode with low cost is adopted in the design, that is, only 1 IGBT, no anti-interference, soft start and other industrial needs technology, the application of electromagnetic heating industrialization is obtained. It is beneficial to the development of the induction cooker. Since 2007, the industrialization of electromagnetic heating has begun to develop. Now, many main boards on the market are remodeled by simply using the single tube of the household induction cooker. The production cost of the household single tube is rather low, but the application to the industry immediately exposed many fatal problems:

1, interference problem: because the industrial use is normal, more than one platform is used on a barrel, and the magnetic lines of force superimposed on each other interfere with each other, causing many electromagnetic motherboards' operating waveforms to be seriously disturbed. As we all know, the electronic components are mainly affected by the running waveforms, because the components are not running under the correct waveforms, which causes the components to be easily damaged. A lot of single tubes are used very well. Generally, the bad plate rate is more than 3 months, reaching 30%.

2, the problem of technological backwardness. Single transistor IGBT has no internal parallel diode, IGBT reverse voltage withstand capacity is very low, only tens of volts. Easy to breakdown.
3, the design problem: as mentioned earlier, the design standard of household induction cooker can only be heated for 4 hours by single continuous heating, so the components used are very ordinary household grade products, and the heating of plastic industry is often 24 hours, and 1 months of continuous work is normal. This is also the reason why the single tube is easy to fail.

4, low cost leads to low quality: due to design problems, single tubes are used for very common components. These components are not able to meet the requirements of continuous use, factory environment, and voltage fluctuations in some areas. The current overload capability is low. The fatal IGBT is very poor, and only one is easy to puncture.  

5, soft start, soft interface, multi-level parallel function: the company's half bridge motherboard has a direct start / soft start function, can be selected according to needs, the factory is installed according to the soft start function, greatly reduces the fault possibility, also reduces the impulse current to the factory power grid, has the soft interface, and can control through the temperature control and the contactor signal. And multiple parallel synchronous control.   

6, anti-interference: Zhongshan Sheng Chi Electronics Co., Ltd. half bridge main achievement in this area is the most outstanding, can share multiple pieces, no interference, normal operation. Installation does not require stringent requirements for fear of interference.
7, direct start: single tube design is too simple, start is direct start, strong current instantaneous impact is also the cause of bad plate.

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