Specifications

B-field Exposure From Induction Cooking Appliances 28
Figure 20: Dependency of the signal frequency on the heat setting. Graphs a), b) and c)
correspond to appliances 1, 2 and 3, respectively.
harmonics is calculated for appliances 1, 2 and 3 in Tables 7, 8 and 9, respectively. These Tables
show that the contribution in terms of power of all harmonics does not exceed 1 %, 2.5 % and
1.8 % of the fundamental signal for appliances 1, 2 and 3, respectively.
The total harmonics contribution is also given in terms of B-field weighted with the frequency
f, which is more meaningful for evaluating the contribution to the induced current J in the
body (see Chapter 7). If P
fi
(in [%]) is the contributions in term of power of the harmonics at
the frequencies f
i
= 3f, 5f, etc., the induced current is proportional to:
J ∝ f
1
q
P
f1
+ f
2
q
P
f2
+ ... ∝ f(3
q
P
3f
+ 5
q
P
5f
+ ...) ∝ f
X
i
i
q
P
if
(8)
4.2.3 B-Field Exposure Dependency on the Heat Settings
As shown in Figure 22 a), for appliance 1, the B-field exposure increases linearly for higher heat
settings. Figures 22 b) and 22 c) show that this dependency follows a second and fourth order
polynomial for appliances 2 and 3, respectively.