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EMS-Guide 2023 www markttechnik de currents in the stainlesssteel disc which heat it and hence the liquid in which it is immersed The target temperature for the liquid can be set at between 30°Cand 100°Cin 5°Cincrements and feedback from the temperature sensor in the wand ensures this temperature is reached An app enables users to control the way that the liquid is heated so that for example baby milk can be slowly heated to body temperature by inducing 300 Winto the rod while water can be boiled as quickly as possible by inducing up to 2000 W The design challenge Developing the Heatle system has meant overcoming several design challenges including optimising the circuitry to drive the coils that generate the electromagnetic field choosing the right microcontroller to manage the impact of the rapidly changing physical relationship between the disc and the base and implementing a Bluetooth link between the base and the rod in the presence of the electromagnetic fields that are heating the disc and create noise and distortion for relevant electromagnetic processes Perhaps the most challenging of these has been to find the right switching devices to drive the PFC coils Unlike in a traditional induction hob that heats a static saucepan whilst the heating disc in the Heatle design is heated its position is shifted by bubbles forming in the liquid surrounding it – or by the user stirring manually This changes the physical relationship between the driving coils and the driven disc meaning that the resonant frequency must adapt the way it is driving the coils to ensure that the energy transfer between the two remains as efficient as possible And this demands that the power transistors driving the coils can switch relatively large currents very rapidly “We have had to design a circuit that‘s constantly adapting itself to the resonant frequency of the disc something that no other induction hob ever needs to do as the pan or pot is always laying close flat and not moving ” said Budagaschwili Introducing silicon carbide Heatle began by trying to use standard silicon IGBTs which are widely available cost effective and have already been successfully employed in domestic fancooled induction hobs Multi CoMponents GmbH D-91126 schwabach tel +49 0 9122 9302-0 info@multicomponents de www multicomponents de ergänzende Komponenten storage tower Material Management für elektronik-Bt lötanlagen lötmaterial und projekt-Kalkulationssoftware Multi Components sichert ihre hochproduktive Fertigung mit persönlicher Beratung installation mit ersatzteil-Versorgung schulung und festangestellter servicemannschaft Multi CoMponents – siCher · zuverlässig · loyal HAnWHA tRi ese Bestücken inspizieren Drucken Module für die elektronikfertigung info@photocad de www photocad de SMD-Schablonen für maximale Leistung PRÄZISION DIE FUNKTIONIERT für schnellen Standard für kleinste Bauteile Anzeigen