Source Mode Operation
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5.17 Polyphase Function
The IT7900P series power supplies implement the frequency-locked and phase-
locked function between power supplies through the digital IO interface or
System bus interface, which achieve 6 phase& 12 phase power output.
This power supply provides two ways to achieve multi-phase functionality:
⚫ One is to connect the System bus interface between instruments directly
through fiber optic cable, no other connection is needed, the wiring is simple
and convenient, this wiring method requires customers to purchase fiber
optic module and fiber optic cable separately.
⚫ The other is via a digital IO interface, which requires no additional
accessories and the instrument is connected by default.
Take the simulated 6-phase power supply as an example, and introduce the
multi-phase function application method.
5.17.1 Connecting the DUT
When two IT7900P power supplies are combined in multiple phases, the outputs
ABC are connected separately and the N wires of the two IT7900P power
supplies need to be connected together as six-phase N wire terminals. The
wiring schematic is shown below.
5.17.2 Connecting the System Bus Method
The two IT7900P power supplies are connected via the outer ring interfaces TX
and RX in the System bus. Fiber optic connection method customers need to
purchase fiber optic modules and fiber cables.
Connect the System Bus as shown in the diagram below for fiber optic
communication between instruments.
1. Insert the fiber optic module into the hole corresponding to TX RX.
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