Abstract
A high frequency power supply has been designed based upon the tuned resonant circuit principle. It is d.c. powered, compact and lightweight, and its operation is controlled by a microcomputer. This technique has been applied to the electrical heating of a diving suit to replace the cumbersome hot water heating system. The output a.c. frequency is at 30 kHz which is a frequency giving maximum safety during diving activities. The use of electromagnetic coupling for power transfer from the power source to the suit not only improves electrical safety but also gives protection against short circuited load. Theoretical modelling has shown that high efficiency can be achieved and experimental measurements have given efficiency of the order of 86%. The power source may be used to provide efficient and safe electrical power in a wide range of applications underwater.
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