Section II
General Product Information
006-0007207 MPC-1250DC Guide
Rev F
7 of 44
03/03/2022
Product Topology
The SynQor MPC‑1250 DC Output Series products use a true on‑line double conversion topology
that provides protection to the load from spikes, noise, surges, brownouts, blackouts, etc. in
the input power sources. They also provide smoothing of load transients and nonlinear load
profiles so that the input power sources are not subjected to these disturbances. There is
a seamless transfer from any power source to another so that there is no disruption in the
output voltage waveform.
As the figure below shows, there is a nominal 28 V mid‑bus within the MPC that draws power
from one of up to two power sources: the AC INPUT or the DC INPUT (with that order of priority
based on availability). EMI filters are present at all external inputs and outputs.
AC
INPUT
DC
INPUT
DC
OUTPUT
AC to DC
w/ PFC
and
ISOLATION
ELECTRONIC
SWITCH
ISOLATED
DC-DC
CONVERTER
BULK ENERGY
STORAGE
CAPACITOR
IDEAL
DIODE
Power flows from the AC INPUT through an AC‑DC converter that has Power Factor Correction
(PFC) and high‑frequency safety isolation. Power flows from the DC INPUT through an electronic
switch that is closed when the AC INPUT power is absent and the DC INPUT voltage is within
its specified range.
The DC output can deliver up to 1250 W. The DC output is isolated from the AC input.
Bulk energy storage capacitors are connected to the mid‑bus to help smooth imbalances in
power flow between the inputs and output of the MPC.
There is a communication/control port that provides a digital interface to a host computer system.