Abstract: A circuit structure capable of adjusting gradient of output to temperature variation includes at least a sensing unit for detecting ambient temperature variation and generating a sensing signal, an amplifying unit connected to the sensing unit for increasing a level of the sensing signal, and an adjusting unit connected to the amplifying unit for increasing or decreasing an amplification ratio of the amplifying unit, so as to change a gradient of an output of the amplifying unit to temperature variation.

Abstract: A complex type temperature control circuit for a cooling fan includes two or more resistance series sets. The first resistance series set is a resistor connecting in series with a temperature sensing member. The second resistance series set is a resistor connecting in series with a temperature sensing member too. Further, the second resistance series set is connected in parallel to the temperature sensing member of the first resistance series set. Hence, the complex type temperature control circuit can make a voltage change rate resulting from temperature change increases such that a range of fan rotational speed change can be increased under the same temperature change.

Abstract: A circuit structure capable of adjusting gradient of output to temperature variation includes at least a sensing unit for detecting ambient temperature variation and generating a sensing signal, an amplifying unit connected to the sensing unit for increasing a level of the sensing signal, and an adjusting unit connected to the amplifying unit for increasing or decreasing an amplification ratio of the amplifying unit, so as to change a gradient of an output of the amplifying unit to temperature variation.