Figure 4-13 The connection of power supply box and main unit box
4.5.1 AC Connecting Board
The functions of AC connecting board are as follows.
âš« It provides two AC power interfaces.
âš« It controls auxiliary output through the relay. When AC is in the place and the ultrasound
system is powered on, it turns on the output. And when the ultrasound system is powered
off, it turns off the AC power to the peripheral devices and printers.
4.5.2 AC-DC Module
AC-DC module turns electric supply to direct current power supply.
The input and output specifications of the module are as follows.
âš« AC input: the voltage is 100 to 240 Vac.
âš« 24V output: the rated power is 400W.
âš« 24V output: is controlled by main control system, non-standby power supply.
4.5.3 24V to 12V Power Conversion Board
The module supports the following features.
âš« 24V to 12V/5V/VDD_STB; and 12V power can provide power for DC-DC circuit;
âš« Battery to12V/5VSTB/VDD_STB; and 12V power can provide power for DC-DC circuit;
âš« Switching between battery and AC power;
âš« Monitoring 24V output and AC_OK signal output (If there is no output from 24V power,
AC_OK signal remains for 1ms, and then becomes ineffective);
âš« Power-on time sequence management: the board turns on 5VSTB by monitoring
PWR_BTN, and turns on or off VDD_STB and 12V;
âš« Battery charging management;
âš« Battery output enabling control;
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