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2.2 Power PWM circuit
2.2.1) Block diagram :( fig.4)
2.2.2) AC Input and EMI Filter :( fig.5)
CN850 is a connector for connecting AC Power. F850 is a fuse to protect all the circuit AC.
Input voltage is from 90V to 264V. R850 ,R851 and R852 are joined between two inputting main
circuit to prevent man from shock. L850 is used to clear up low frequency wave. C850 and C851
are used to discharge the waves that L850 produced. High frequency waves are damped by
C852
Fig.4
L850
4
1
3
2
CHK-007
R851
499K
R852
R850
499K
499K
RT850
5R4A
C852
0.47uF X 2
C850
C851
222 Y 2
222 Y 2
F850
3.15A 250V
1
3
CN850
HF-301PCB 7MM
fig.5
8
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