Comp Operating Signal Area; Bootstrap Charging Area - Samsung RF4287HARS Service Manual

AW3 SM-EN 2011.3.31 2:56 PM 페이지102 in
TROUBLESHOOTING

4-3-5. Comp Operating Signal Area

1) It is the circuit which receives COMP operating signal (200HZ ~ 400HZ) from Main PCB and controls the RPM
of the Inverter Comp.

4-3-6. BOOTSTRAP Charging Area

1) It is the charging circuit that 1GBT of SPM can On/Off securely.
This circuit stores the power voltage to operate High-Side Power Switch of SPM and is constituted as 3
Capacitors and charges the capacitors by turning the Low-Side Power Switch "On" just before starting the motor
for a certain period of time (1000ms).
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