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Researchers Submit Patent Application, "Motor Controlling Circuit, Motor Driving Device and Method of Driving Motor", for Approval

February 20, 2014



By a News Reporter-Staff News Editor at Politics & Government Week -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventor GU, Bon Young (Suwon, KR), filed on December 12, 2012, was made available online on February 6, 2014.

The patent's assignee is Samsung Electro-mechanics Co., Ltd.

News editors obtained the following quote from the background information supplied by the inventors: "The present invention relates to a motor controlling circuit, a motor driving device, and a method of driving a motor.

"A brushless direct current (BLDC) motor generally refers to a DC motor in which a function of conducting current or adjusting a current direction is adjusted by using a non-contact position detector and a semiconductor device rather than using a mechanical contact such as a brush, a commutator, or the like, in the DC motor.

"Generally, a speed of a motor, of which a speed is controllable, may be controlled by adjusting a duty value of a pulse width modulation (PWM) signal. The duty value of the pulse width modulation signal may be determined according to a ratio between a turn-on time at which the signal has a high value in a single signal period and a turn-off time at which the signal has a low value in a single signal period, and a rotational speed of the motor may be in proportion to the duty value of the pulse width modulation signal.

"In the case of the BLDC motor, the rotation of the motor is controlled according to a hall signal of which a level is changed according to polarity, and motor controlling signals are generated by detecting a falling edge at which the level of the hall signal is changed from high to low and a rising edge at which the level of the hall signal is changed from low to high.

"Since driving of the motor is controlled according to the hall signal, in the case in which noise is generated in the hall signal, erroneous motor controlling signals may be generated, such that the motor may rotate in reverse.

"In addition, in the case in which the level of the hall signal rises from low to high, impulse signals may be generated several times until the hall signal has a stabilized high level. Here, in controlling the driving of the motor, in the case in which the motor controlling signals are generated by detecting both of the rising and falling edges of each impulse signal generated before a high level is stabilized, motor driving efficiency may be deteriorated."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "An aspect of the present invention provides a motor controlling circuit, a motor driving device, and a method of driving a motor, capable of efficiently generating motor controlling signals by comparing impulse signals generated until a changed level of a hall signal is stabilized at the time of a change in a level of the hall signal with a preset time.

"Another aspect of the present invention provides a motor controlling circuit, a motor driving device, and a method of driving a motor, capable of preventing a motor from rotating in reverse by determining that a signal generated during a process of stabilizing a hall signal is an impulse signal or a noise signal.

"According to an aspect of the present invention, there is provided a motor controlling circuit including: a hall signal level detecting unit detecting a hall signal from a hall sensor; and a signal generating unit sensing a change in a level of the hall signal to generate a motor controlling signal according to the change in the level of the hall signal, wherein the signal generating unit determines that the hall signal is maintained at a high level in a case in which a high level maintaining time of the hall signal is equal to or shorter than a preset time.

"The preset time may be set from a frequency detected when a motor rotates at maximum speed.

"The motor controlling circuit may further include a comparing unit transferring a comparison value generated by comparing the motor controlling signal output from the signal generating unit and a reference signal to the signal generating unit.

"The comparison unit may output the comparison value so that the motor controlling signal is initialized in the case in which the motor controlling signal output from the signal generating unit and the reference signal are different from one another.

"According to another aspect of the present invention, there is provided a motor driving device including: a motor driving unit; a hall signal level detecting unit detecting a hall signal generated by sensing a polarity of a motor from a hall sensor included in the motor driving unit; and a signal generating unit generating a motor controlling signal according to a change in a level of the hall signal output from the hall signal level detecting unit, wherein the signal generating unit determines that the hall signal is maintained at a high level in a case in which a high level maintaining time of the hall signal is equal to or shorter than a preset time.

"The preset time may be set according to a period of the hall signal detected when the motor rotates at maximum speed.

"The motor driving device may further include a comparing unit comparing the motor controlling signal output from the signal generating unit and a reference signal and transferring a comparison result to the signal generating unit, wherein the comparison unit outputs a comparison value so that the motor controlling signal is initialized in the case in which the motor controlling signal output from the signal generating unit and the reference signal are different from one another.

"According to another aspect of the present invention, there is provided a method of driving a motor, the method including: detecting a hall signal from a hall sensor; sensing a change in a level of the hall signal to generate a motor controlling signal and determining that the hall signal is maintained at a high level in a case in which a high level maintaining time of the hall signal is equal to or shorter than a preset time, to thus generate the motor controlling signal; and driving the motor according to the motor controlling signal.

"The preset time may be set according to a period of the hall signal detected when the motor rotates at maximum speed.

"The method may further include comparing the motor controlling signal and a reference signal and initializing the motor controlling signal in the case in which the motor controlling signal and the reference signal are different from one another.

BRIEF DESCRIPTION OF THE DRAWINGS

"The above and other aspects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:

"FIG. 1 is a block diagram schematically illustrating a motor controlling circuit according to an embodiment of the present invention;

"FIG. 2 is a diagram schematically illustrating a motor driving device according to the embodiment of the present invention;

"FIGS. 3 through 5 are graphs provided in order to describe a method of driving a motor according to the embodiment of the present invention; and

"FIG. 6 is a flow chart provided in order to describe the method of driving a motor according to the embodiment of the present invention."

For additional information on this patent application, see: GU, Bon Young. Motor Controlling Circuit, Motor Driving Device and Method of Driving Motor. Filed December 12, 2012 and posted February 6, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=5159&p=104&f=G&l=50&d=PG01&S1=20140130.PD.&OS=PD/20140130&RS=PD/20140130

Keywords for this news article include: Samsung Electro-mechanics Co. Ltd.

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Source: Politics & Government Week


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