Aquarium water temperature controller

Details Aquarium water temperature controller Aquarium water temperature controller

1999-03-31

2000-08-01

Paschall, Mark

Electric heating

Heating devices

With power supply and voltage or current regulation or...

497523, 497499, 392408, H05B 102

Patent

active

060970073

ABSTRACT:
An aquarium water temperature controller, which includes a glass casing, an inner tube mounted within the glass casing, an electric heating element mounted in the glass casing and connected to the inner tube, and a circuit board mounted in the inner tube and electrically connected to the electric heating element, wherein the circuit board includes a bridge circuit having a thermistor, a comparator circuit controlled by the bridge circuit to output high/low potential subject to temperature detecting status of the thermistor, a bias voltage generating circuit connected to the bridge circuit and the comparator circuit, an analog switching circuit controlled by the bias voltage generating circuit, a thyristor, and a voltage following circuit and an integrating circuit controlled by the analog switching circuit to turn on the thyristor when the bridge circuit outputs low potential, or to turn off the thyristor when the bridge circuit outputs high potential. The thermistor and the thyristor are connected with a respective heat conductive strip member having wing portions disposed in contact with the inside wall of the glass casing.

REFERENCES:
patent: 4124793 (1978-11-01), Colman
patent: 5392380 (1995-02-01), Tsai
patent: 5568587 (1996-10-01), Marioni
patent: 5834741 (1998-11-01), Tseng

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