FAN CONTROLLING CIRCUIT
First Claim
Patent Images
1. A fan controlling circuit for detecting a rotational speed of a fan, comprising:
- a comparison circuit configured for receiving a rotational speed signal from the fan at one input terminal, a reference voltage at another input terminal, and outputting a filtered rotational speed signal at an output terminal; and
a controlling chipset for receiving the filtered rotational speed signal, and outputting a control signal to control the rotational speed of the fan.
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Abstract
A fan controlling circuit for detecting rotational speed of a fan, includes a comparison circuit and a controlling chipset. The comparison circuit receives a rotational speed signal from the fan at one input terminal, a reference voltage at another input terminal, and outputs a filtered rotational speed signal at an output terminal. The controlling chipset receives the filtered rotational speed signal, and outputs control signals to control the rotational speed of the fan.
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Citations
8 Claims
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1. A fan controlling circuit for detecting a rotational speed of a fan, comprising:
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a comparison circuit configured for receiving a rotational speed signal from the fan at one input terminal, a reference voltage at another input terminal, and outputting a filtered rotational speed signal at an output terminal; and a controlling chipset for receiving the filtered rotational speed signal, and outputting a control signal to control the rotational speed of the fan. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification