Mindray DC-8 EXP Service Manual

Product Principle 4-19
Connecting
board
Isolation
transformer
AC-DC
power board
Back-end
power
board
Front-end
power board
Battery
EDC_+12V
D+12VSTB
Front end power
output
AC auxiliary output
AC input
EDC_+12V_EN_N
EDC_+12V_OK_N
Back-end control signal
Front end control
signal
Communication
motherboard
Back-end
motherboard
Back-end power output
Battery
Battery status signal
SMBUS
EDC_+12V
Fig 4-23 Schematic Diagram of Power System
The mains power goes to the connecting board through the circuit breaker, it will provide power to
AC-DC power board after transferring, besides, it provides AC auxiliary output for peripherals
(printer, e.g.) after isolation transforming. Once the AC-DC power board is powered by the mains
power, it will provides D+12VSTB, which will power the Standby circuit on the back-end power
board. When received the system startup command EDC_+12V_EN_N, EDC_+12V will be output
to power the front-end power board, back-end power board and other +12V required. Other DC
power in the front-end and back-end will be generated from DC-DC conversion through front-end
power board and back-end power board.
Back-end control signal mainly consists of: system start-up/shut down logic, system status
indicating, temperature gathering, battery management, etc. Front-end control signal mainly
consists of power monitoring, temperature gathering and voltage programmable control, etc.
For details about the boards of power supply unit, please refer to the following chapters.
4.8.1 Connecting Board
Surge
inhibit
circuit
Connecting board
EMI
inhibit
circuit
Relay
AC auxiliary
output
Mains power input
Auxiliary
output control
Isolation
transformer
Back-end
motherboard
Fig 4-24 Schematic diagram of connecting board
As the connection and current distributing part for mains power input, this part consists of
connecting board and isolation transformer.
Function:
 Isolation transformer: realize AC auxiliary output power and mains power electrical
isolation.
 Connecting board: provide connections ports for mains power input, isolation transformer,
mains power output, AC auxiliary output or signal connection ports, meanwhile, it controls
the On/Off of AC auxiliary output.

Mindray DC-8 EXP Specifications

General

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