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The graphs below show the voltage at the points A Fig 23.3. B Fig. 23.4. and C Fig. 23.5 in the
figure Fig. 23.2. above, when the capacitors is fully charged.
The PWM voltage in point A charges the capacitor between A and B to the PWM voltage minus
the voltage drop over the diode connected to ground.
When the PWM output gets low, the capacitor keeps it potential.
This gives a negative voltage in point B equivalent to the charging of the capacitor.
4/00021-3/FEA 209 544/18 B
Fig. 23.2
Fig. 23.3
Fig. 23.4
Trouble Shooting Guide, Advanced
101(121)
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