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MATRIX INDUCTION
Technical Training
OPERATION
- 24 -
CU3A5
-
MATRIX
-
001
-
For the MATRIX hob, the power stage is made to operate at high frequencies and voltages. The transistors
heat up rapidly. The purpose of the fans and the radiator on the power board is to cool the electronics,
particularly the IGBT transistors.
Operation of the inverter
The operation of the inverter on the MATRIX hob is totally different from that of the old generation induction
hob. The power board is equipped to drive twelve inductors. It can control several inductors at the same time
and can offer different power levels.
Each inverter drives an inverter. This new configuration operates as follows:
Phase 0
Idle
The transistor behaves like an open switch.
There is no voltage to the inductor and
capacitor terminals. The transistor is not
controlled.
The capacitor is parallel to the inductor.
C
Diode
Transistor
Phase 1
The transistor is controlled and behaves like a
closed switch.
A current therefore passes through the
inductor via the closed transistor up to
maximum voltage.
The capacitor is loaded.
Phase 2
Positive half-wave
The transistor is blocked (transistor open) and
the inductor forces the current into the
capacitor which is parallel.
This phase ends when all the energy stored in
the inductor has been completely transferred
into the capacitor.
When this happens, the assembly goes
through 0.
Phase 3
Negative half-wave
The energy stored in the capacitor is sent to
the inductor.
The transistor is still open. The diode blocks
the current which moves in the opposite
direction to the inductor.
When the current passes through 0, another
cycle starts up (return to phase 1).
Available power
The power is distributed according to the number of inductors used. Each inductor is able to supply
a maximum of 900 Watts, according naturally to the quality of the material and the diameter of the
cooking vessel.
When several inductors are used, they are controlled in accordance with the power requested and
alternately or at the same time depending on the instantaneous power available (3600) through the
generator.
The power of the inductor changes in accordance with the frequency: 38Khz for 300W to 28Khz for
3600W. Below 300W, variations are made in switched mode (on-off).
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