Battery changer for a medical appliance.

摘要

Medical appliances of this kind are frequently supplied with electrical power from rechargeable batteries which are recharged via a transformer (Tr) which can be connected to mains voltage and the rectifier (3) connected on its low-voltage side. According to the invention, a timer (9) is connected to the charging current circuit for the battery, said timer switching back the charging current after a predetermined time (1.5 h) after an initially relatively high value to a value acceptable for continuous charging. A test key (10) is expediently provided, the actuation of which interrupts the charging process and briefly loads the battery with maximum current requirement, and it is expedient that the value of the battery voltage is then measured under load and compared with a predetermined reference voltage (11), a monitoring lamp (LED) then lighting only if the battery voltage is higher than the reference voltage. Battery chargers designed according to the invention are outstandingly suitable for supplying batteries in relatively small, portable medical appliances, for example asthma inhalation appliances.