ICC03-400B2 datasheet(5/7 Pages) STMICROELECTRONICS

5 / 7 page

BASIC APPLICATION

FLY-WHEEL

SENSOR

COIL

SUPPLY

COIL

STOP

BUTTON

IGNITION

COIL

SPARK

PLUG

ICC03

The applications using the capacitive ignition

system (CDI) operate in 3 phases.

PHASE 1

Storage of the energy in the capacitor C1

PHASE 2

Discharge of the capacitor C1 and spark

generationto the ignition coil.

PHASE 3

Engine stop.

1) ENERGY STORAGE IN C1

The coil L1 generates an alternative voltage. Its

positive part charges the capacitor C1 through the

diode D2.

The negative waves are clamped by the diode D3.

2) SPARK GENERATION

For each fly-wheel revolution the sensor coil

produces a bidirectional pulse Vs and triggers the

ignition coil.

The negative sinewave generated is clamped by

D4 while the positive sinewave initiates a current

IG through the thyristor gate (Th)

The firing of the SCR causes an alternating

discharge current Ic through the capacitor C1.

The positive parts of this current flow in the loop

C1, Th and the primary of the ignition coil PR.

The negative parts flow through C1, PR and both

diodes D3 and D2.

3) ENGINE STOP

The engine stop is obtained by short circuiting the

supply coil L1 (stop button). The diode D1 avoids

the accidental connection of battery voltage.

see functional diagram page 1

ICC03-400B2

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