Patent ID: 7558035
Filing Date: 2009-07-07
Classification: G06F

Abstract:
1. An anomaly control device for a dual fan of computer, comprising: a first driving IC, a pulse-wave-signal output end of which is connected to a first coil; a second driving IC, a pulse-wave-signal output end of which is connected to a second coil, and voltage-signal output ends of the first and second driving ICs are connected to a voltage level comparing circuit respectively; and a controller, output ends of which, for controlling output or on/off of voltage signals, are connected to voltage signal input ends of the first and second driving ICs respectively; the pulse-wave-signal output end of the first driving IC being connected to the voltage level comparing circuit through a shunt, and a signal output end of the voltage level comparing circuit being connected to an input end of the controller; the voltage level comparing circuit performing a voltage dividing to a first and second reference potential signals input from the first and second driving ICs to generate a third reference potential signal which is compared with a reference pulse wave signal output from the output end of first driving IC for determining to either output a high level pulse voltage signal or output a low voltage direct-current signal to the controller for processing; provided that the voltage level comparing circuit when the voltage level comparing circuit outputting the high level pulse voltage signal to the controller, the output end of controller outputting a control-gate-on signal to the first and second driving ICs, to activate the first and second coils, wherein the voltage level comparing circuit includes a transistor, at least two diodes, a Zener diode, and a comparator; a signal input end of the transistor being connected to the signal output end of first driving IC; an output end of the transistor being connected to a positive input end of the comparator; a common connection end of the two diodes and the Zener diode being connected to a cathode input end of the comparator; an output end of the comparator being connected to the controller; other connection ends of the two diodes being connected to the signal output ends of the first driving IC and the second driving IC, respectively; and another connection end of the Zener diode being connected to a positive source VCC.