Siemens EH70650 Repair Instructions page 16

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Interference filter.
The interference filter consists of an assembly of coils and condensers
that allow the emission of electromagnetic interference to be limited.
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Power supply.
The power supply is the switched type and has 4 different outputs:
+24 V for the fan power supply.
+5 V for the power supply of the control logic.
+21 V for the power supply of the drivers of the power inverter
devices.
+21 V for the power supply of the drivers of the power inverter devices
for the right electronics board.
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Inverter with two outputs
The power inverter converts the alternating current of the power grid
into the variable high-frequency alternating current that power the
inductors.
It basically consists of a power rectifier and two inverters with series-
resonant half bridge topology.
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Inverter control
The inverter power devices are controlled by an integrated circuit
especially designed by BSH.
microprocessor and imposes the operating frequency of the inverter
and is responsible for feeding back the output current of the inverter.
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Induction module control
206_58300000105199_ara_en_h – 15.03.a
This circuit communicates with the
The induction electronics module is controlled by a microprocessor.
This component communicates with the TC, thereby receiving the
power levels selected by the user, and it returns information on the
burner status (container detection, errors, etc.) to the TC.
Cooktop control is moreover responsible for monitoring the
temperature of the power inverter and the inductors, for deciding on
fan connection, for monitoring the residual heat indicators, etc
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