Mindray DC-8 EXP Service Manual

4-20 Product Principle
4.8.2 AC-DC Power Board
APFC
circuit
EMI
filter
Shift full bridge
circuit
AC-DC power board
Back-end
mother
board
Mains power input
EDC_+12V
D+12VSTB
EDC_+12V_EN_N
EDC_+12V_OK_N
TM_ACDC_D*
Control circuit
Inverse circuit
Fig 4-25 Schematic Diagram of AC-DC Power Board
Function description:
 The mains power is input to AC-DC power board after pass through the back-end
motherboard, pass through the EMI filter circuit, been rectified and filtered, then activate
the inverse circuit working, then output D+12VSTB to the back-end motherboard to
provide power to the back-end power board, and then the APFC circuit will work normally.
When system is turned on, it outputs EDC_+12V to power the front-end power board and
back-end power board.
 The main power of AC-DC power board is EDC_+12V; maximum rated current is 55A,
realized by shift full bridge circuit and synchronous rectification. EDC_+12V output is
controlled, when the system is turned on, the enable signal EDC_+12V_EN_N is low,
power output is normal, otherwise there is no EDC_+12V output.
 Output the board temperature and status signal of main power.

Mindray DC-8 EXP Specifications

General

Brand	Mindray
Model	DC-8 EXP
Category	Medical Equipment
Language	English