DPB is a public power supply module installed in the WCU / IIU, converted to a DC power supply of +3.3 VDC, +5 VDC, +12 VDC, +3.3 VAaux, and -12 VAux by being supplied with + 220 VDC, and is supplied to each corresponding device It is a power supply board that plays a function of stably supplying power.The DPB module was designed to meet all WCU / IIU requirements of submarine integrated fighting system.