Device for generating an electrical voltage of predetermined wav

Details Device for generating an electrical voltage of predetermined wav Device for generating an electrical voltage of predetermined wav

1993-02-11

1995-06-20

Heyman, John S.

Electrical pulse counters, pulse dividers, or shift registers: c

Starting, stopping, presetting or resetting the counter

377056, 323283, 327337, 327 3, H03K 492, H03K 402

Patent

active

054263875

ABSTRACT:
The device comprises a switched-mode power supply (1) equipped with an electronic switching member (T.sub.1), the closing of which controls the power supply to an inductor (L.sub.1) which discharges, when the member reopens, into a capacitor (C.sub.1) at the terminals of which the output voltage of the device appears, characterized in that it comprises (a) storage means for recording a sequence of image numbers of successive segments of the predetermined waveform, (b) a clocked digital counter (2) and (c) means (3) for successively loading this counter (2) with each of the numbers of this sequence considered as a bound of the count performed by the counter (2), the latter cyclically controlling the closing of the switching member (T.sub.1) for a predetermined time interval, each time the count performed reaches the limit thus fixed.

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`Study of the Mechanisms of Flux Enhancement Through Hairless Mouse Skin by Pulsed DC Iontophoresis`, Pikal and Shah, Pharmaceutical Research, vol. 8, No. 3, 1991, pp. 365-369.
`Facilitated Transdermal Delivery of Therapeutic Peptides and Proteins by Iontophoretic Delivery Devices`, Chien et al, Journal of Controlled Release, 13 (1990), pp. 263-278.

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