8-42
8. SWITCHING REGULATOR CIRCUIT
8-1. Rectifying and Smoothing Circuit
AC input is rectified by D601. Then, it is smoothed by C610 and C609.
The resulting DC voltage is supplied to the converter circuit.
(Fig. 8-1) Rectifying and Smoothing Circuit
8-2. Auxiliary Power Supply Circuit
The auxiliary power supply circuit need to activate IC621. When the power switch is turn on, the current
flows into the capacitor C623 through R634, R635 and D602. Oscillation starts when the voltage of IC621
pin 9 reaches 8V by this action.
After the start of oscillation, the fly-back voltage of the auxiliary winding of T601 is rectified and smoothed
by D625,D623 and C623.
The resulting DC voltage is supplied to IC621 pin 9.
(Fig.8-2) Auxiliary Power Supply Circuit
AC
D601
+
C610
AC
-
CONVERTER
CIRCUIT
+
-
C609
AC
SW601
D602
Q623
L621
R638
D624
T601
R634
IC621
D625
D623
9
VIN
+
+
GND
-
-
2
ZD622
C623
C624
D601
R625
R635
R636
Summary of Contents for MultiSync FP1370
Page 13: ...4 4 REMARK SYMBOL Mount the EMF PWB 121E REMARK SYMBOL Clamp the connector ...
Page 14: ...4 5 REMARK SYMBOL COIL FORMING UPPER SIDE REMARK SYMBOL COIL FORMING LOWER SIDE ...
Page 23: ...4 14 REMARK SYMBOL REMARK SYMBOL Clamp CN CA CN CC and CN D with CLAMPER WIRE ...
Page 26: ...4 17 REMARK SYMBOL Clamp the wires SAFETY REMARK SYMBOL Clamp the wires CN ASD CN AF 21 ...
Page 80: ...5 51 Fig 3 11 CONV PWB Fig 3 12 EMF PWB CN EMF CN LL CN RR CNEM CN CA CN D CN CCB HS8N1 ...
Page 143: ...8 18 15V 80V AFC D FOCUS Fig 3 1 HIGH VOLTAGE CIRCUIT AND PROTECTOR CIRCUIT ...
Page 260: ...10 1 ...
Page 261: ...10 2 ...
Page 262: ...10 3 ...
Page 263: ...10 4 ...
Page 264: ...10 5 ...
Page 266: ...for Human Potential ...
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