Fan control circuit
AssigneeMinebea Co., Ltd.
InventorHenry J. Riddoch
Life of this patent
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Abstract
There is described a circuit for controlling the operation of a fan. The circuit operates to control the speed of the fan and to operate the means to monitor fan malfunctioning.
Claims10
A control circuit for controlling a fan in which a commutated signal indicative of the fan speed is processed with reference to a reference signal indicative of a desired fan speed in order to give a control signal, wherein the control signal is processed via an evaluation and generation circuit to generate a control voltage which is used to control the operating speed of the fan, and wherein there is provided means to monitor said control voltage to detect inadequate fan functioning;
- and
- an input element connected to the control circuit and operable for selecting only one of among a plurality of signals that represent a plurality of desired fan speeds and for providing the selected signal for processing by the evaluation and generation circuit.
Dependencies are inferred from the claim text.