Method and apparatus for controlling the charging phase of an im

Details Method and apparatus for controlling the charging phase of an im Method and apparatus for controlling the charging phase of an im

1996-05-03

1997-12-23

Kamm, William E.

Surgery: light, thermal, and electrical application

Light, thermal, and electrical application

Electrical therapeutic systems

A61N 139

Patent

active

057002800

ABSTRACT:
The on time of a flyback converter is controlled without the need for a current-sensing resistor. Under one approach, an internal battery resistance R.sub.B is used as a substitute for the current-sensing resistor. The battery voltage V.sub.B decreases as a function of current drain from the battery due to the internal impedance. Charging control circuitry causes the on time to be terminated when the battery voltage V.sub.B falls below a predetermined reference voltage V.sub.R, where V.sub.R =V.sub.B1 -.DELTA..DELTA.V.sub.B. V.sub.B1 represents the battery voltage before charging is commenced, and .DELTA.V.sub.B represents the drop in battery voltage from V.sub.B1 when the battery current drain exceeds a predetermined maximum current. Under another approach, the charging control circuitry regulates the time out period t.sub.on1 =K/V.sub.B, where K is a predetermined constant, such that it is 10-15 percent longer than the on time t.sub.on.

REFERENCES:
patent: 5193538 (1993-03-01), Ekwell
patent: 5285779 (1994-02-01), Cameron et al.
patent: 5318591 (1994-06-01), Causey, III et al.
patent: 5447522 (1995-09-01), Chang et al.
patent: 5470341 (1995-11-01), Kuehn et al.
patent: 5488553 (1996-01-01), Renger

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