4-18 Product Principle
 Select isolation transformer when switching between 220V and 110V. It is not necessary to
switch for AC-DC input It supports 110V or 220V generally.
 Auxiliary output switch control function; the default auxiliary output is off when the machine is
powered off.
4.4.2 Auxiliary Output Power Isolation Transformer
Auxiliary output provides AC power for the user peripherals. It needs to isolate the leakage current
of auxiliary output in order to meet the regulation. The platform uses the isolation transformer.
The key indices of the auxiliary output of the ultrasound system: 2 auxiliary output port, one for B/W
printer, another for color printer and other peripherals, Power consumption is totally 300VA
(100~127 Vac or 220~240Vac@50/60Hz in total).The two interfaces of the ultrasound system are
on the AC interface module.
4.4.3 AC-DC module
AC-DC module changes the AC power to DC power to provide power for other assemblies by
DC-DC module. The module needs the indicating signal when AC power is off to control the circuit
of battery.
The specification of the ultrasound system is as follows:
 AC-DC outputs 3 voltage, there are:
a) 12V: not less than 692W (DC-DC module 572W, PHV module 120W);
b) 24V: not less than 150W (electrical ascending/descending 50W, two electromagnets
each is 50W).
c) 5V_STB (Output from 5V board assembly): the peak current is 2A when powering on,
duration in 4ms; the average valve is in 500mA when working normally.
 The ultrasound system does not define the function of standby status when battery in, so it
is not necessary to have AC power off indicator. Take the reservation into consideration by
platforms.
 The indicator when AC is in the place: reminds of the validity of AC input; it is used for
service personnel to decide the failure on the scene, available.
 I2C interface: main control system obtains the work status of module. Available.
4.4.4 DC-DC board
DC-DC board provides DC power for different functional boards and peripherals to fulfill the
requirement of current and voltage, special requirement as follows:
 Support PC system standby.
 Support ATX sequence.
The switch of DC-DC can interfere with the analog circuit of front-end easily. It should keep
away from the front-end board. Provide grounding shield when necessary.
Power-up and power-down sequence of functional board is realized in board.
4.4.5 PHV module
The PHV module provides the DC current for the following modules:
 Programmable voltage power of the general transmission circuit.
 Programmable power for CW transmission circuit.
 Power for high voltage switch.
 Programmable bias voltage for special probe.
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