Understanding How Modern Induction Cookers Work

By Akshat Jain & Ranajay Mallik, AMG CENTRAL LAB, STMicroelectronics, INDIA

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Quasi Resonant topology based Induction Cooker:

The quasi resonant induction cooktop system of “1.8KW” has been developed using STGWT20IH125DF – 1250V, 20A IH series trench gate field-stop IGBT and STM8S003F3 – value line 8-bit microcontroller from STMicroelectronics. Ready to manufacture is the maturity level. The system is incorporated with comprehensive safety mechanism to handle voltage transients and inconsistent cookware/utensil. The block diagram of the system developed is shown in Figure 2, while the actual system is shown in Figure 4.

Block diagram - quasi resonant induction cooktop
Figure 3: Block diagram – quasi resonant induction cooktop
Quasi resonant induction cooktop - 1800W, ready to manufacture solution
Figure 4: Quasi resonant induction cooktop – 1800W, ready to manufacture solution

Half Bridge Topology based Induction Cooker:

The Half bridge induction cooktop system evaluation board of “3.5KW” has been developed using STGW40H65DFB – HB series 650V, 40A high speed, Trench gate field-stop IGBT, L6491 High voltage high and low-side 4 A gate driver and STM32F072– 32-bit MCU from STMicroelectronics. The system is incorporated with comprehensive safety mechanism to handle voltage transients and inconsistent cookware/utensil. The block diagram of the system developed is shown in Figure 5, while the actual system is shown in Figure 6.

Block diagram - half bridge resonant induction cooktop
Figure 5: Block diagram – half bridge resonant induction cooktop
Half bridge Induction Cooktop – 3500W, Evaluation Board
Figure 6: Half bridge Induction Cooktop – 3500W, Evaluation Board
Features comparison between quasi resonant and half bridge resonant induction system developed
Table 2: Features comparison between quasi resonant and half bridge resonant induction system developed

Conclusion:

Induction cooking is a promising technology for those seeking sustainability in the kitchens, hotels restaurants, and is clearly a better choice over standard electric or the expense and carbon footprint of installing a gas line.

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3 COMMENTS

  1. Let’s say I want to run the same ckt using DC. Can I just remove the rectifier part and do that? I am guessing I need to tinker the feed to the IGBTs but not sure exacly how.

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