4-16 Product Principle
4.5.2 DC-DC Module
DC-DC module provides public power supply (for example, 12 V, 3.3 V) or specialized power supply
(for example A±5.7 V) to ultrasound service module. It meets the requirements of the voltage and
the current. The service module is able to fulfill the switching of the power supply.
4.5.3 PHV Module
PHV is the acronym of Programmable Height Voltage. The transmission voltage used in the
transmission circuit needs to be adjusted based on varied probes, modes and the depth. Hence, it
requests the program control for the transmission voltage.
PHV module on DC-DC board refers to PHV board.
Absolute value of output voltage is 1.5±5%V~80±5%V; 100 V.
4.5.4 Time Sequence of Power-On
The time sequence of main unit's power-on:
1. Connects AC power supply to main unit.AC-DC outputs the standby power supply 5VSTB by
default to supply the power to EC on PC board. The in-place AC indicator on the control panel
remains on.
2. The user presses the power-on button on the control panel. It triggers PWRBTN_N to supply
EC.
3. EC interacts with PC module according to ATX time sequence. After the standby status of PC
module rises higher, EC notifies AC-DC module of enabling 12_ACDC of non-standby power
supply and outputs to DC-DC module to complete the transfer. Transfers varied power supply,
including PC12 V. After PC12V stays stable, EC module notifies of enabling PC module. Then,
PC module starts BIOS. The power-on indicator on the control panel blinks during the process.
If the indicator blinks in orange, it indicates SUS_S3_N of PC module does not rise higher. PC
module is poorly assembled or corrupted. If the indicator blinks in green, it indicates PC12V is
not powered on. The failure may occur to power supply module. The indicator remains green if
it works well.
4.6 User interaction Unit
4.6.1 Control Panel Assembly
Control panel carries the most of the user interaction operation of the main unit: imaging mode
switching, parameter adjustment, operation order, etc.
Control panel’s functions of DC-70 product:
Power on button
Status indicators: including working status, AC in-place, battery status, standby status,
hard disk reading status.
Alphanumeric keyboard. User-defined keys. Drawer-like: the backlight is on when drawing
out; the backlight is off when pushing in.
Trackball: including right/left keys.
USB port.2 USB 2.0.
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