IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0967174
(2010-12-14)
|
등록번호 |
US-8354807
(2013-01-15)
|
우선권정보 |
TW-99127005 A (2010-08-12) |
발명자
/ 주소 |
- Lee, Teng-Hui
- Liu, Chan-Chih
|
출원인 / 주소 |
- Amtek Semiconductor Co., Ltd.
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
4 |
초록
▼
An anti-noise method for the Direct Current Brushless motor System, which includes a startup circuit, phase detective circuit, motor phase commutation circuit, driving circuit, BEMF detective circuit, and frequency detector, utilizes the BEMF detective circuit to detect the BEMF induced from the coi
An anti-noise method for the Direct Current Brushless motor System, which includes a startup circuit, phase detective circuit, motor phase commutation circuit, driving circuit, BEMF detective circuit, and frequency detector, utilizes the BEMF detective circuit to detect the BEMF induced from the coils of the outer motor, and utilizes the sampled voltage phase to determine rotation speed and phase of the external motor by the phase detection circuit and frequency detector. Further, the sampling voltage of the BEMF detection circuit is feedback controlled by the frequency detector, utilized to keep good BEMF to noise ratio, and avoids the BEMF sampling error from the system.
대표청구항
▼
1. A direct current (DC) brushless motor system without sensor device having two steps startup function including a control device and one end of the control device is connected to an oscillation device, a switching device and one end of the switching device is connected to the control device and th
1. A direct current (DC) brushless motor system without sensor device having two steps startup function including a control device and one end of the control device is connected to an oscillation device, a switching device and one end of the switching device is connected to the control device and the other end is connected to a startup device, a detective device and one end of the detective device is connected to the startup device, a driving circuit and one end of the driving circuit is connected to the detective device and the other end is connected to an external motor and feedbacks to the other end of the detective circuit; wherein the DC brushless motor system is characterized by: when the DC brushless motor system has been activated, the rotation speed of the DC brushless motor system is sequentially achieved in a first predetermined startup rotation speed and a second predetermined startup rotation speed with different frequency so as to achieve a system predetermined rotation; andwherein the detective device is made by a phase detective circuit, a phase rotation circuit, a Back Electromotive Force (BEMF) detector and a frequency detector, and one end of the phase detective circuit is connected to the startup device and the other end is connected to the phase rotation device, and the other end of the phase rotation circuit is connected to one end of the driving circuit, and one end of the BEMF detector is connected to the feedback of the driving circuit and the external motor and the other end is connected to the phase detective circuit and the frequency detector, and the frequency detector is connected to the phase detective circuit. 2. The DC brushless motor system of claim 1, wherein the startup device is made by a startup circuit and a normal rotation circuit. 3. The DC brushless motor system of claim 1, wherein the second predetermined startup rotation speed is integral multiple of the first predetermined rotation speed. 4. The DC brushless motor system of claim 1, wherein the first predetermined rotation speed is 30 rpm. 5. A direct current (DC) brushless motor system without sensor device comprising: a control device, and one end of the control device is connected to an oscillation device;a switching device, and one end of the switching device is connected to the other end of the control device;a startup device, and one end of the startup device is connected to the other end of the switching device;a detective device, and one end of the detective device is connected to the other end of the startup device;a driving circuit and one end of the driving circuit is connected to the other end of the detective device and the other end is connected to an external motor; and feedbacks to the other end of the detective circuit from a three-phase coil of the external motor;a phase lock loop frequency device connected to the detective device, wherein the detective device includes: a phase detective circuit, and one end of the phase detective device is connected to the startup device and the other end is connected to the frequency detector and the phase lock loop frequency device;a phase rotation circuit, and one end of the phase rotation circuit is connected to the other end of the phase detective circuit and the other end is connected to one end of the driving circuit;a BEMF detector, and one end of the BEMF detector is connected to the feedback of the three-phase coil of the external motor and the other end is connected to the phase detective circuit;a frequency detector, and one end of the frequency detector is connected to the phase detective circuit and the phase lock loop frequency device and the other end is connected to the BEMF detector; wherein the BEMF detector includes:a BEMF detective switch, and one of the BEMF detective switch is connected to the feedback of the three-phase coil of the external motor;a BEMF sample amplifier, wherein a first input end is connected to an output end of the BEMF switch, a second input end is connected to a level voltage of the three-phase coil, and a third input end is connected to the frequency detector and outputs a positive voltage sine wave and a negative voltage sine wave;a hysteresis comparator including a first hysteresis level, and an input end is connected to the positive voltage sine wave and the negative voltage sine wave and the other end is connected to the frequency detector and outputs a BEMF detective signal to the phase detective circuit. 6. The DC brushless motor system of claim 5, wherein the BEMF amplifier includes a normal voltage gain mode and a voltage suppressing mode. 7. The DC brushless motor system of claim 5, wherein the hysteresis comparator further includes a second hysteresis level. 8. The DC brushless motor system of claim 5, wherein the startup device is made by a startup circuit and a normal rotation circuit. 9. The DC brushless motor system of claim 5, when the DC brushless motor system has been activated, the rotation speed of the DC brushless motor system is sequentially achieved in a first predetermined startup rotation speed and a second predetermined startup rotation speed with different frequency so as to achieve a system predetermined rotation. 10. The DC brushless motor system of claim 9, wherein the second predetermined startup rotation speed is integral multiple of the first predetermined rotation speed. 11. A rotation speed and phase detective method for a direct current (DC) brushless motor system without sensor device, and the DC brushless motor system includes a control device and one end of the control device is connected to an oscillation device, a switching device and one end of the switching device is connected to the control device and the other end is connected to a startup device, a detective device and one end of the detective device is connected to the startup device, a driving circuit and one end of the driving circuit is connected to the detective device and the other end is connected to an external motor and feedbacks to the other end of the detective circuit from a three-phase coil of the external motor; a phase lock loop frequency device connected to the detective device and wherein the detective device includes a phase detective circuit, and one end of the phase detective device is connected to the startup device and the other end is connected to the frequency detector and the phase lock loop frequency device; a phase rotation circuit, and one end of the phase rotation circuit is connected to the other end of the phase detective circuit and the other end is connected to one end of the driving circuit; a BEMF detector, and one end of the BEMF detector is connected to the feedback of the three-phase coil of the external motor and the other end is connected to the phase detective circuit; a frequency detector, and one end of the frequency detector is connected to the phase detective circuit and the phase lock loop frequency device and the other end is connected to the BEMF detector; wherein the BEMF detector includes: a BEMF detective switch, and one of the BEMF detective switch is connected to the feedback of the three-phase coil of the external motor; a BEMF sample amplifier, wherein a first input end is connected to an output end of the BEMF switch, a second input end is connected to a level voltage of the three-phase coil, and a third input end is connected to the frequency detector and outputs a positive voltage sine wave and a negative voltage sine wave; a hysteresis comparator including a first hysteresis level, and an input end is connected to the positive voltage sine wave and the negative voltage sine wave and the other end is connected to the frequency detector and outputs a BEMF detective signal to the phase detective circuit, wherein when the DC brushless motor system has been activated, the rotation speed and the phase detective method comprising: providing a BEMF generated by three-phase current sequence on the three-phase coil passing the BEMF detective switch;providing a level voltage provided by the three-phase coil; provide a pair of sine wave voltages generated in accordance with comparing the BEMF and the level voltage by the BEMF amplifier, and the pair of sine wave voltages includes a positive voltage sine wave and a negative voltage sine wave;providing a BEMF detective signal generated in accordance with the sine wave voltages by the hysteresis comparator, and the BEMF detective signal is connected to the phase detective circuit to detect the present rotation speed and the phase of the external motor; andproviding a gain control signal, and the gain control signal is outputted in accordance with the preset rotation speed of the phase lock loop frequency device and the present rotation speed of the external motor by the frequency detector. 12. The detective method of claim 11, wherein the hysteresis comparator further includes a second hysteresis level. 13. The detective method of claim 12, wherein the gain control signal is a high voltage signal when the rotation speed of the external motor is larger than the preset rotation speed of the phase lock loop frequency device, and the hysteresis level in the hysteresis comparator is switched to the second hysteresis level. 14. The detective method of claim 11, wherein the gain control signal is a low voltage signal when the rotation speed of the external motor is less than the preset rotation speed of the phase lock loop frequency device, and the BEMF amplifier is switched to the normal voltage gain mode. 15. The detective method of claim 14, where the hysteresis level in the hysteresis comparator is a first hysteresis level. 16. The detective method of claim 11, wherein the gain control signal is a high voltage signal when the rotation speed of the external motor is larger than the preset rotation speed of the phase lock loop frequency device, and the BEMF amplifier is switched to the voltage suppressing mode. 17. The detective method of claim 16, where the hysteresis level in the hysteresis comparator is a first hysteresis level. 18. The detective method of claim 11, when the DC brushless motor system has been activated, the rotation speed of the DC brushless motor system is sequentially achieved in a first predetermined startup rotation speed and a second predetermined startup rotation speed with different frequency. 19. The detective method of claim 18, wherein the second predetermined startup rotation speed is integral multiple of the first predetermined rotation speed.
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