Principle Description
3-24
PFC
board
Input
filter
FORWARD
converter
secondary
auxiliary power
supply
+5V/30A
output
+3.3V/30A
output
PWM
control
feedback
+5V/+3.3V
BUCK
converter
PF signal
circuit
optocoupler
isolation
(feedback)
optocoupler
isolation
(feedback)
Active
clamp
PF signal
3.3.2.4
-5V board
The -5V board adopts the structure of single-end forward converter, and its block diagram is
shown as follows. The 390Vdc input enters the power board through the +5V board and a
connector, and it passes the LC filter to become the input of the FORWARD converter. After
passing the FORWARD converter, the DC voltage is converted to stable DC outputs of +12V,
-5V and -12V. The +12V is the main feedback output of the converter, the other two are
auxiliary outputs, and adjustment of magnetic amplifier is used as stabilizing method.
Summary of Contents for DC-6
Page 1: ...DC 6 DC 6T DC 6Vet Diagnostic Ultrasound System Service Manual...
Page 2: ......
Page 20: ...2 1 2 System Overview 2 1 System Appearance 2 1 1 Complete System with CRT Monitor...
Page 23: ...System Overview 2 4 2 2 LCD Monitor...
Page 26: ...System Overview 2 7 2 2 3 Lever of upper support arm...
Page 66: ...4 1 4 System Structure and Assembly Disassembly 4 1 Exploded View of Complete System...
Page 101: ...System Structure and Assembly Disassembly 4 36 Power boards Card detacher...
Page 191: ...P N 2105 20 40473 V10 0...