Electricity: battery or capacitor charging or discharging – Serially connected batteries or cells – With discharge of cells or batteries
Patent
1981-01-19
1983-04-12
Pellinen, A. D.
Electricity: battery or capacitor charging or discharging
Serially connected batteries or cells
With discharge of cells or batteries
179107R, 320 48, H02J 702, H04R 2502
Patent
active
043799884
ABSTRACT:
A molded hearing aid of the self-containing type having a rechargeable battery disposed therein, in the form of a molded plug which will fit in the ear of the user. A light emitting diode is disposed through the external surface of the plug and is internally connected in series with an iron core inductor with the series combination in parallel with the internal chargeable battery. A battery charger is provided having a cup for receiving the molded plug and having a multiturn coil wound around the periphery of the cup. The coil is connected into an oscillator circuit and tuned to cause the circuit to oscillate at about 30 kHz. The oscillator coil couples to the iron core inductor in the plastic plug thereby inducing a 30 kHz ac voltage across the coil. The light emitting diode rectifies the alternating current and is connected in a polarity so as to charge the internal battery of the hearing aid. As the charging current flows through the light emitting diode, the diode is illuminated indicating to the user that charging is taking place and indicating by its brillance when the hearing aid is located in its optimum position.
REFERENCES:
patent: 3195540 (1965-07-01), Waller
patent: 3493695 (1970-02-01), Stork
patent: 3867950 (1975-02-01), Fischell
patent: 3885211 (1975-05-01), Gutai
patent: 3938018 (1976-02-01), Dahl
patent: 4005412 (1977-01-01), Leander
patent: 4177413 (1979-12-01), Ascoli
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