Source: http://www.google.com/patents/US7170246?dq=6,209,672
Timestamp: 2017-06-28 04:41:32
Document Index: 668557724

Matched Legal Cases: ['Application No. 2003', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'art 70', 'Application No. 2003']

Patent US7170246 - Motor control apparatus - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA motor control apparatus supplying braking power to brake a motor comprises a braking power providing unit to receive input power having an input power voltage lower than a braking power voltage and to boost the input power voltage up to the braking power voltage to brake the motor; a switching unit...http://www.google.com/patents/US7170246?utm_source=gb-gplus-sharePatent US7170246 - Motor control apparatusAdvanced Patent SearchTry the new Google Patents, with machine-classified Google Scholar results, and Japanese and South Korean patents.Publication numberUS7170246 B2Publication typeGrantApplication numberUS 10/769,799Publication dateJan 30, 2007Filing dateFeb 3, 2004Priority dateFeb 7, 2003Fee statusPaidAlso published asCN1533022A, CN100336297C, US20040155615Publication number10769799, 769799, US 7170246 B2, US 7170246B2, US-B2-7170246, US7170246 B2, US7170246B2InventorsJang-Hyoun YoumOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (25), Non-Patent Citations (2), Classifications (11), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMotor control apparatus
US 7170246 B2Abstract
A motor control apparatus supplying braking power to brake a motor comprises a braking power providing unit to receive input power having an input power voltage lower than a braking power voltage and to boost the input power voltage up to the braking power voltage to brake the motor; a switching unit closing to allow the braking power providing unit to store the input power and opening to allow the braking power providing unit to output the braking power by boosting the input power voltage and a stored power voltage up to the braking power voltage; and a controller to control the switching unit to close and to open. With this configuration, a motor control apparatus is provided, in which an additional braking power supply supplying braking power to brake a motor is not needed, thereby decreasing a production cost and a size of a product.
This application claims the benefit of Korean Patent Application No. 2003-7873, filed Feb. 7, 2003, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.
Accordingly, it is an aspect of the present invention to provide a motor control apparatus to generate braking power without an additional power supply.
FIGS. 5A–5D illustrate four waveforms of a boost signal, a braking signal, a logic signal from an AND circuit, and a braking voltage in the motor control apparatus according to the embodiment of the present invention.
Further, the motor control apparatus comprises an AND circuit part 70 provided between the controller 20 and the gate terminal of the FET 40 and performing an AND operation between a boost signal and a braking signal (“Br on/off”) which are outputted from the controller 20, thereby outputting a logical value to the gate terminal of the FET 40. Further, an AND gate may be used as the AND circuit part 70, which outputs a logical signal having a first level of “1” only when both the boost signal and the braking signal have logical values of “1”, and, otherwise, outputs the logical signal having a second level of “0”. The FET 40 may turn off when the AND circuit part 70 outputs the logical signal having the first level of “1”, and may turn on when the AND circuit part 70 outputs the logical signal having the second level of “0”.
Further, the controller 20 continuously outputs the boost signal having a predetermined duty cycle to the AND circuit part 70. Simultaneously, the controller 20 outputs the braking signal having a logical value of “0” to the AND circuit part 70. The AND circuit part 70 performs the AND operation between the boost signal and the braking signal, which has the logical value of “0” and outputs the logical signal having the second level of “0” to the gate terminal of the FET 40 to connect the drain terminal of the FET 40 and the source terminal of the FET 40, i.e., turning on the FET 40.
FIG. 3 illustrates power flow on the braking power providing unit 30 when the FET 40 is turned on. In this case, the input power having the voltage of 5V is stored in the inductor 32 while the FET 40 is turned on. Further, voltage “VL” applied between opposite ends of the inductor 32 can be written as follows, where inductance of the inductor 32 is “L”.
However, when the controller 20 senses a predetermined signal to brake the motor 1 (refer to “t1” in FIG. 5D), the controller 20 outputs the braking signal having the logical value of “1” and the braking signal having the logical value of “1” is transmitted to the AND circuit part 70, and the AND circuit part 70 performs the AND operation between the boost signal and the braking signal having the logical value of “1”, to output the logical signal. Further, the logical signal outputted from the AND circuit part 70 has a waveform corresponding to a waveform of the boost signal, and turns on/off the FET 40 in response to a duty cycle of the braking signal.
FIG. 4 illustrates a power flow on the braking power providing unit 30 when the FET 40 is turned off. In this case, the input power from the controller power supply 60 and the power stored in the inductor 32 are stored in the condenser 34. The power stored in the condenser 34 is outputted and used as the braking power to brake the motor 1. Further, a voltage “VB” outputted to the condenser 34 can be written as follows.
V B=5V−V L Where VL (refer to equation 1) is a voltage applied between the opposite ends of the inductor 32, whose positive and negative ends are reversed when the FET 40 is turned off, the VL having a negative value. Therefore, the voltage “VB” outputted to the condenser 34 is higher than the input power of 5V applied to the inductor 32. That is, the braking power voltage outputted through the condenser 34 is higher than the input power voltage inputted to the inductor 32. FIG. 5D illustrates that the braking power “VB” outputted through the condenser 34 is 24V.
Further, when the controller 20 does not sense a predetermined signal to brake the motor 1 or senses a predetermined signal to interrupt braking of the motor 1 (refer to “t2” in FIG. 5D), the controller 20 outputs the braking signal having the logical value of “0”. Then, the braking signal having the logical value of “0” is transmitted to the AND circuit part 70, and the AND circuit part 70 outputs the logical signal having the second level of “0”, thereby turning on the FET 40 and allowing the inductor 32 to store the input power supplied from the controller power supply 60.
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