-48Vdc/4000A Telecommunications Power supply - Project of 1998
The equipment bellow is a -48Vdc/4000A Telecomunications Power Supply is formed of 40 converters of -48Vdc/100A in parallel and with current equalization. This consfiguration with 4 modules in each floor was use by me since 1986 and was adopted in TELEBÁS standards.
The communications system is through a token ring fiber optics network. The technology of the converter is ZVS-QRC (Zero Voltage Switching - Quasi Ressonant Converter) and PSM (Phase Shift Moulation) controlled . Works in 250Khz and microcontroller controlled
You can see the CININTEL (International congress of telecommunications) Paper at https://www.energysat.com.br/pagina/cinintel_98.pdf