Low Component Cost Single Tube Induction Cooker
WAS-2041EN V1.00
1 / 19
February 25, 2021
Low Component Cost Single Tube
Induction Cooker
D/N: WAS-2041EN
Introduction
A traditional kitchen stove heats foods over an open flame while the induction cooker utilises an
electromagnetic induction method to implement a heating function. In this way foods are cooked
by the heat of the cookware itself. Compared to the open flame heating method, an induction cooker
can increase the heating efficiency by 90%. As a safety feature, the induction cooker will be
automatically shut off if the cookware has been removed for a certain period of time. During
cooking, the cooktop surface temperature is much lower than a traditional kitchen stove and in
addition, the induction cooker and cookware are more easily cleaned than a traditional stove.
A traditional single-tube induction cooker pursues a higher power, however in an IGBT resonance
circuit the reverse interference signal is also increased. The traditional way to solve this is to improve
the component specifications to enhance the induction cooker EMI circuit reverse interference signal
filtering capabilities. This reference design utilises a frequency jittering function to adjust the induction
cooker IGBT switching frequency, thus effectively decreasing the reverse voltage generated due to the
induction cooker IGBT switching as well as reducing the EMI CE conducted interference. In this way,
a lower component cost EMI circuit solution is provided. As the HT45F0058 includes an integrated
hardware frequency jittering circuit, this can effectively reduce the software load when compared with
the method whereby a software frequency jittering function is used.
Figure 1. Application Block Diagram
