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MATRIX INDUCTION
TECHNICAL TRAINING
OPERATION
- 23 -
CU3A5
-
MATRIX
-
001
-
325 V
325 V
condensateur
Condo.
Diode
Transistor
7.3.1. - Structure of the filter board
7.4. - Rectifier
To supply the inductors, a high frequency must be applied to them. To increase from 50Hz to 38KHz, the
supply voltage must first be rectified using a diode bridge (Graëtz). A 3µF filter capacitor is linked in order
to attenuate the high frequency signals and to smooth the output voltage of the rectifier. As shown in the
illustration, the rectifier output voltage is approximately the voltage of the supply peak (or around 325V –
when no inductor is supplied). This voltage drops during operation.
7.5. - Inverter
The inverter helps to transform a continuous signal into an
adjustable frequency alternating signal. This inverter (new
typology) is made up of a single IGBT and a resonance
capacitor. The freewheeling diode is built into the IGBT
transistor.
The transistor is controlled by a generator whose frequency
varies between 28 kHz and 38 kHz depending on the power
required.
CONTROL
RELAY
VDR
SWITCHED
-
MODE POWER
SUPPLY
EARTH
SCREW
CAPACITORS
INDUCTION COILS
+ CAPACITORS
23


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