Power supply system for supplying electric power to a load through plural converters

A power supply system for supplying DC electric power to plural loads which are divided into plural groups, said power supply system comprising:

• a plurality of first common buses connected to supply electric power to a first group of said plural loads, said first common buses forming a first cluster;
• a second cluster comprising a plurality of second common buses connected to said first cluster;
• a plurality of third common buses connected to said second cluster;
• and
• a first switching element connecting said first common buses and said second common buses;
• a second switching element connecting said second common buses and said third common buses;
• and
• a plurality of converters having DC outputs connected to said third common buses.

A power supply system for use in an electric car, comprising:

• a plurality of motors for driving the electric car;
• a plurality of electric power converters;
• and
• a plurality of battery power supplies;
• wherein
• said plurality of motors and said plurality of converters are connected through a plurality of common buses;
• said plurality of converters and plurality of battery power supplies are connected through at least one common bus;
• and
• said plurality of electric power converters comprises a plurality of electric power converters for converting
• one of an alternating current and a direct current to a direct current having a predetermined voltage, outputs of said converters being connected in parallel to supply electric power to a load;
• a current detector means for detecting a magnitude of output current of each of said converters;
• a maximum current detector for detecting magnitude of a maximum output current value among output current values of said converters detected by said current detection means;
• a control for controlling said converters to match said detected output current values of each of said converters to said maximum output current value;
• and
• a voltage value control means for detecting output voltage values of said converters and for controlling said output voltage values of each of said converters to have predetermined values;
• wherein said voltage value control means comprises a comparison means for comparing said maximum output current value with output current values of each of said converters, and each of said output voltage values of said converters is controlled to reduce a difference between said detected maximum output current value of said converter and said detected output current value of each said converter to zero, whereby output current values of said converters is the same as said maximum output current value.

A power supply for use in a computer system having a plurality of computers, comprising:

• a plurality of converters for supplying electric power to said plurality of computers;
• a plurality of rectifying units;
• and
• a plurality of AC power supplies;
• wherein
• said plurality of computers and said plurality of converters are connected through plural common buses;
• said plurality of converters and said plurality of rectifying units are connected through at least one common bus;
• and
• said plurality of converters comprises
• a plurality of electric power converters for converting one of an alternating current and a direct current to a direct current having a predetermined voltage, outputs of said converters being connected in parallel to supply electric power to a load;
• a current detector means for detecting a magnitude of output current of each of said converters,
• a maximum current detector for detecting magnitude of a maximum output current value among output current values of said converters detected by said current detection means;
• a control for controlling said converters to match said detected output current values of each of said converters to said maximum output current value;
• and
• a voltage value control means for detecting output voltage values of said converters and for controlling said output voltage values of each of said converters to have predetermined values;
• wherein said voltage value control means comprises a comparison means for comparing said maximum output current value with output current values of each of said converters, and each of said output voltage values of said converters is controlled to reduce a difference between said detected maximum output current value of said converter and said detected output current value of each said converter to zero, whereby output current values of said converters is the same as said maximum output current value.

A power supply system for supplying DC electric power to plural loads which are divided into plural groups, said power supply system comprising:

• a plurality of first common buses connected to supply electric power to a first group of said plural loads, said first common buses forming a first cluster;
• a second cluster comprising a plurality of second common buses connected to said first cluster;
• a plurality of third common buses connected to said second cluster;
• a plurality of converters having DC outputs connected to said third common buses;
• and
• a voltage value control means for detecting output voltage values of said converters and for controlling said output voltage values of each of said converters to have predetermined values.