Fan system and real-time stopping device thereof

• US 20070145923A1
• Filed: 12/14/2006
• Published: 06/28/2007
• Est. Priority Date: 12/23/2005
• Status: Active Grant

• Current Assignee: Delta Electronics Incorporated
• Original Assignee: Delta Electronics Incorporated
• Inventors: Chiu, Chun-Lung, Chiu, Chin-Fa, Huang, Wen-Shi
• Granted Patent: US 7,696,706 B2
• Time in Patent Office: Days
• US Class Current: 318/375
• CPC Class Codes: H02P 3/12 by short-circuit or resistive braking
• CPC Class Codes: H02P 6/24 Arrangements for stopping

Abstract

A fan system includes a stator magnetic pole, a driving unit and a real-time stopping unit. The driving unit is coupled with the stator magnetic pole and controls a polarity change of the stator magnetic pole in accordance with a driving signal. The real-time stopping unit is electrically connected with the driving unit. When the fan system is powered off, the driving unit enables two ends of the stator magnetic pole to have the same voltage level in accordance with a control signal generated by the real-time stopping unit so that the fan system stops operating immediately.

Claims

1. A fan system, comprising:

a stator magnetic pole;

a driving unit coupled with the stator magnetic pole for controlling a polarity change of the stator magnetic pole in accordance with a driving signal; and

a real-time stopping unit electrically connected with the driving unit;

when the fan system is powered off, the driving unit enables two ends of the stator magnetic pole to have the same voltage level in accordance with a control signal generated by the real-time stopping unit so that the fan system stops operating immediately.

2. The fan system according to claim 1, wherein the driving unit comprises a bridge circuit, a full-bridge circuit or a half-bridge circuit.

3. The fan system according to claim 2, wherein the stator magnetic pole has a first coil and a second coil, the half-bridge circuit has a first transistor and a second transistor, the first transistor is electrically connected with the first coil, the second transistor is electrically connected with the second coil, and the control signal turns on the first transistor and the second transistor.

4. The fan system according to claim 3, wherein the first transistor and the second transistor are NMOS transistors, respectively.

5. The fan system according to claim 2, wherein the full-bridge circuit comprises a lower bridge element composed of a first transistor and a second transistor, and an upper bridge element composed of a third transistor and a fourth transistor, and the lower bridge element turns on simultaneously in accordance with the control signal.

6. The fan system according to claim 5, wherein the first transistor and the second transistor are NMOS transistors, and the third transistor and the fourth transistor are PMOS transistors.

7. The fan system according to claim 2, further comprising a first Zener diode and a second Zener diode, wherein the first Zener diode and the second Zener diode are connected with the stator magnetic pole and the bridge circuit.

8. The fan system according to claim 1, wherein the driving signal is a pulse width modulation (PWM) signal.

9. The fan system according to claim 1, wherein the real-time stopping unit comprises a first switch element and a second switch element.

10. The fan system according to claim 9, wherein the first switch element and the second switch element are transistors or NMOS transistors.

11. The fan system according to claim 9, wherein the real-time stopping unit further comprises an energy storage electrically connected with the first switch element and the second switch element.

12. The fan system according to claim 11, wherein the real-time stopping unit further comprises a resistor electrically connected with the energy storage.

13. The fan system according to claim 11, wherein the energy storage is a capacitor or a capacitor having a small capacitance.

14. The fan system according to claim 11, wherein when the fan system is powered off, the first switch element and the second switch element turn off simultaneously, and the energy storage generates the control signal to enable the two ends of the stator magnetic pole to have the same voltage level so that the fan system stops operating immediately.

15. The fan system according to claim 1, further comprising a first diode and a second diode, wherein one end of the first diode is electrically connected with the second diode, and another end of the first diode is electrically connected with the real-time stopping unit.

16. The fan system according to claim 1, wherein the fan system is an axial-flow fan system or a centrifugal fan system.

17. A real-time stopping device of a fan system, the fan system having a stator magnetic pole and a driving unit, wherein the driving unit is coupled with the stator magnetic pole and controls a polarity change of the stator magnetic pole in accordance with a driving signal, the real-time stopping device comprising a real-time stopping unit electrically connected with the driving unit, and when the fan system is powered off, the driving unit enables two ends of the stator magnetic pole to have the same voltage level in accordance with a control signal generated by the real-time stopping unit so that the fan system stops operating immediately.

18. The device according to claim 17, wherein the real-time stopping unit comprises a first switch element and a second switch element, and the first switch element and the second switch element are transistors or NMOS transistors.

19. The device according to claim 18, wherein the real-time stopping unit further comprises an energy storage, and the energy storage is electrically connected with the first switch element and the second switch element.

20. The device according to claim 19, wherein the real-time stopping unit further comprises a resistor electrically connected with the energy storage, and the energy storage is a capacitor or a capacitor having a small capacitance.