FAN DRIVING CIRCUIT WITH TEMPERATURE COMPENSATION

A fan driving circuit with temperature compensation comprises a power input end, a power output end connected with a fan motor, a first transistor arranged between the power input end and the power output end, a signal adjuster connected with the first transistor and connected with a signal generati...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: CHOU, Sheng-Chien, CHANG, Chih-Sheng, LO, Cheng-Yung
Format: Patent
Sprache:eng
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Beschreibung
Zusammenfassung:A fan driving circuit with temperature compensation comprises a power input end, a power output end connected with a fan motor, a first transistor arranged between the power input end and the power output end, a signal adjuster connected with the first transistor and connected with a signal generating circuit, a second transistor connected with the signal adjuster, and a feedback unit. The feedback unit comprises a first resistor and a second resistor connected in series, and a compensation bypass connected in parallel with the first resistor or the second resistor, wherein the compensation bypass comprises a thermistor, a resistance of the thermistor changes along with the temperature and changes a magnitude of a feedback current which is provided to the second transistor, so as to compensate a change of a common emitter current gain in the second transistor generated by the temperature.