Title :
Water-cooled switching power supply
Author :
Hiraki, Motozane ; Kano, Takanobu ; Kizu, Hirohiko ; Satoh, Hiroyuki ; Yamashita, Shigeharu ; Kobayashi, Kazuo ; Tanaka, Hiroo ; Arai, Yasuhiro ; Satoh, Ken ; Fuchigami, Kazutoshi
Author_Institution :
Fujitsu Ltd., Kawasaki, Japan
Abstract :
The authors describe a novel water-cooled switching power supply that is one-third of the size of the conventional air-cooled 2.2 kW power supply. A size reduction of one-third makes it possible to locate the supply nearer the logic circuits. To achieve this size reduction: (1) the size of the output filter was reduced and a forward two-phase switching PWM (pulse width modulation) topology with a switching frequency of 200 kHz was used; and (2) the main switching elements and output diodes are water-cooled using the same coolant that is used for the logic circuits. Since these elements account for as much as 70% of the overall losses in a switching power supply, this technique resulted in a better than 83% reduction in the volume of the heat sink. The performance of the switching power supply is described, with emphasis on the circuit and the cooling system
Keywords :
cooling; heat sinks; power supplies to apparatus; pulse width modulation; switched mode power supplies; 2.2 kW; 200 kHz; PWM; SMPS; heat sink; logic circuits; losses; output filter; size reduction; water-cooled switching power supply; Circuit topology; Filters; Logic circuits; Power supplies; Pulse circuits; Pulse width modulation; Pulsed power supplies; Space vector pulse width modulation; Switching circuits; Switching frequency;
Conference_Titel :
Telecommunications Energy Conference, 1989. INTELEC '89. Conference Proceedings., Eleventh International
Conference_Location :
Florence
DOI :
10.1109/INTLEC.1989.88345
