Operation Manual

THE INDUCTION HOB
Technical training
- 24 -
CU3-INDUCTION-003UK-10/05
GENERAL
OPERATION
After establishment of a voltage on both capacitors, the operation can be broken down into four
phases, as follows:
Phase 0
At rest
Transistors T1 and T2 act as two open
switches.
Capacitors C1 and C2 are supplied and
charged to a voltage V/2, the bridge is
balanced, there is no current in the inducer.
Phase 1
Transistor T1 is controlled and acts as a
closed switch.
A current flows through the inducer while C2 is
charged to +V and C1 is discharged.
Phase 2
Positive alternation
Both transistors are blocked but the inducer
forces a current flow.
C1 is charged again to V/2 and C2 is
discharged down to V/2. The bridge is
balanced again, => the current goes through 0
again
Phase 3
Transistor T2 is controlled and acts as a
closed switch.
A current flows in reverse direction in the
inducer while C1 is charged to +V, and C2 is
discharged.
Phase 4
Negative alternation
Both transistors are blocked but the inducer
forces a current flow.
This is the recovery phase, where C2 is
charged again to V/2, and C1 is discharged
down to V/2, the bridge is balanced again, =>
the current goes through 0 again
Return to step 1.
7.6. - Control
The entire operation is managed by a microprocessor.
• On generation IX1, a specific board performed the control; the power was managed by another
board.
• On generation IX2, these two boards have been soldered and have become indissociable.
• On generations IX3, IX3WR and IX4000, power and control are entirely associated. So, the board
integrates: A 5 and 12 VDC clipping power supply (which is also the keyboard power supply),
the control part (in liaison with the control keyboard), the rectifier part, the inverter part, and
lastly, for board IX4000 and IX6, the filtering part.