Fan system and detector thereof

Abstract

A fan system comprising a motor, a driving unit, and a detector is disclosed. The driving unit is electrically connected to the motor and generates a driving signal to drive the motor. The detector is electrically connected to the driving unit and receives a voltage signal. When the motor operates normally, the detector outputs an examined signal S1. When the motor operates abnormally, the detector receives a detection signal and transforms the examined signal to an alarm signal according to the voltage signal to detect the abnormal state.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention can be more fully understood by reading the subsequent detailed description and examples with references made to the accompanying drawings, wherein:

FIG. 1 depicts a conventional fan system;

FIG. 2A shows one waveform of an examined signal in the conventional fan system;

FIG. 2B shows another waveform of an examined signal in the conventional fan system;

FIG. 3 depicts an embodiment of a fan system;

FIG. 4 depicts an embodiment of a fan system;

FIG. 5A depicts an embodiment of a detector in FIG. 3;

FIG. 5B shows a waveform of an examined in FIG. 5A;

FIG. 6A depicts an embodiment of a detector in FIG. 3; and

FIG. 6B shows a waveform of an examined signal in FIG. 6A.

Claims

1. A fan system, comprising a motor;a driving unit electrically connected to the motor and generating a driving signal to drive the motor; anda detector electrically connected to the driving unit and receiving a voltage signal;

2. The fan system as claimed in claim 1, wherein the driving unit is an integrated circuit (IC), a microprocessor control unit (MCU), or a single chip. detection unit electrically connected to the driving unit to feed the operation state of the motor back to the driving unit.

3. The fan system as claimed in claim 1 further comprising a rotation speed detection unit electrically connected to the driving unit to feed the operation state of the motor back to the driving unit.

4. The fan system as claimed in claim 1, wherein the rotation speed detection unit is a Hall device or a Hall integrated circuit (IC).

5. The fan system as claimed in claim 1, wherein the driving signal and the examined signal are pulse signals or pulse width modulation (PWM) signals, respectively.

6. The fan system as claimed in claim 1, wherein the alarm signal is a direct-current voltage signal having a voltage value of zero.

7. The fan system as claimed in claim 6, wherein the detector comprises a switch element turned on according to the detection signal so that an output terminal of the driving unit is electrically connected to a ground through the switch element.

8. The fan system as claimed in claim 7, wherein the detector further comprises: a first resistor electrically connected between the output terminal of the driving unit and a first terminal of the switch element;a second resistor electrically connected to a second terminal of the switch element and receiving the detection signal; anda third resistor electrically connected to the second resistor and receiving the voltage signal.

9. The fan system as claimed in claim 8, wherein the alarm signal is a direct-current voltage signal provided by a monitor device.

10. The fan system as claimed in claim 9, wherein the detector comprises a first switch element and a second switch element, a first terminal of the first switch element is electrically connected to the driving unit and the second switch element, a second terminal of the first switch element receives the detection signal to turn on the first switch element, and the second switch element is electrically connected to an output terminal of the driving unit and receiving the voltage signal to turn off.

11. The fan system as claimed in claim 10, wherein the detector further comprises: a fourth resistor electrically connected to the second switch element and received the voltage signal;a fifth resistor electrically connected to the first switch element and the second switch element;a sixth resistor electrically connected to the first switch element and receiving the detection signal; anda seventh resistor electrically connected to the sixth resistor and receiving the voltage signal.

12. The fan system as claimed in claim 1 further comprising an amplifier electrically connected to the driving unit to amplify the examined signal output from the driving unit.

13. A detector of a fan system electrically connected to a driving unit and a monitor device to receive a voltage signal and a detection signal, and the fan system outputting an examined signal to the monitor device to determine the operation states of the fan system and outputting the detection signal when the fan system operates abnormally, the detector comprising: a switch element electrically connected to the driving unit for receiving the detection signal so that the fan system is electrically connected to a ground.

14. The detector as claimed in claim 13 further comprising: a first resistor electrically connected to the fan system and a first terminal of the switch element;;a second resistor electrically connected to a second terminal of the switch element and receiving the detection signal; anda third resistor electrically connected to the second resistor and receiving the voltage signal.

15. The detector as claimed in claim 13, wherein the examined signal is a pulse signal or a pulse width modulation (PWM) signal when the fan system operates normally, and a voltage value of the examined signal is zero when the fan system operates abnormally.

16. A detector of a fan system electrically connected to a driving unit and a monitor device to receive a voltage signal and a detection signal, and the fan system outputting an examined signal to the monitor device to determine operation states of the fan system and outputting the detection signal when the fan system operates abnormally, and the detector comprising: a first switch element electrically connected to the driving unit and turned on when the first switch element receives the detection signal; anda second switch element electrically connected to the driving unit and the monitor device and turned off according to the voltage signal when the first switch element is turned on.

17. The detector as claimed in claim 16 further comprising: a fourth resistor electrically connected to the second switch element and receiving the voltage signal;a fifth resistor electrically connected to the first switch element and the second switch element;a sixth resistor electrically connected to the first switch element and receiving the detection signal; anda seventh resistor electrically connected to the sixth resistor and receiving the voltage signal.

18. The detector as claimed in claim 16, wherein the first switch element and the second switch element is a bipolar junction transistor (BJT), a metal oxide semiconductor field effect transistor (MOSFET), or a junction field effect transistor (JFET).