Battery charging unit for a medical appliance

Details Battery charging unit for a medical appliance Battery charging unit for a medical appliance

1989-12-11

1992-02-18

Stephan, Steven L.

Electricity: battery or capacitor charging or discharging

Serially connected batteries or cells

With discharge of cells or batteries

320 23, 320 38, 320 48, H02J 700

Patent

active

050897632

ABSTRACT:
A battery charging unit for a medical appliance, preferably an inhalator, includes a transformer having a high-voltage side to be connected to a mains voltage and having a low-voltage side. A rectifier is connected to the low-voltage side of the transformer. A charge current circuit is connected to the rectifier for charging a battery. A timing control is connected to the charge current circuit for switching a charge current to a value being safe for long-term charging after a predetermined period of time at an initially higher value. A test key is connected to the charge current circuit for interrupting charging of the battery and loading the battery with a given maximum current requirement for a given period of time. The voltage of the battery under load is measured and compared with a predetermined reference voltage after the test key is actuated. A control light signals if the reference voltage is exceeded.

REFERENCES:
patent: 4019112 (1977-04-01), Saton
patent: 4551666 (1985-11-01), Wada et al.
patent: 4554500 (1985-11-01), Sokira
patent: 4673862 (1987-06-01), Wahlstrom
patent: 4857820 (1989-08-01), Tompkins et al.
Waters, "Automatic Nickel Cadmium Battery Tester", Electronic Engineering, 1/78, p. 19.
"Ladeautomatic Fuer NiCad-Akkus", Elektor, 1/79, pp. 1-45 to 1-47.
"Vorlaeufige Technische Daten Fuer Entwicklungbmuster Monolithisch Integrierte Schaltung", Telefunken Electronic, 2/88, p. 12.

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