Operation Manual

THE INDUCTION HOB
Technical training
- 22 -
CU3-INDUCTION-003UK-10/05
GENERAL
OPERATION
7 - OPERATING STEPS
7.1. - Block diagram
7.2. - Keyboard
There are two families of keyboards.
Microswitch keyboards can be entirely tilting or fixed protected by tilting covers. In both cases, a
‘Keyboard operating’ information is recorded either by a switch (tilting keyboard), or by the action of a
magnet (tilting cover) on an I.L.S.
7.2.1. - Keyboards with capacitive keys (IX3, IX3WR, IX4000, IX6)
These keyboards provide a working plane without air inlet (and thus
grease inlet).
The key activation is validated when the user's finger disturbs the
high-frequency signal applied to a blade. For a good operation, each
blade should be perfectly in contact under the glass ceramic.
7.3. - Filtering
By design, the appliance can generate significant high-frequency interference. In order to guarantee a
minimum interference level, an important filtering device is used. It enables induction hobs to be
environment-friendly appliances, whose interference level is smaller than that of a television set.
The ‘filtering’ stage fulfils several missions:
• It protects from operating overcurrents
• It eliminates incoming and outgoing interference
• It eliminates overvoltages (voltage peaks)
Power supply Filter
Rectifier
25-50KHz
inverter
Inducers
Control stage
Keyboard
Inverter pilot
5 & 12 VDC P.S.