Patent application number | Description | Published |
20090167219 | Motor Drive Circuit, Fan Motor, Electronic Device, and Notebook Personal Computer - A motor drive circuit includes: a pulse generation circuit configured to generate a pulse signal whose duty ratio of one logic level is increased as a drive voltage is increased in accordance with a target rotation speed of a motor; and a drive control circuit that configured to drive the motor with the drive voltage using a duty ratio higher than the duty ratio of the pulse signal when the motor starts rotating from the stopped state, and configured to drive the motor with the drive voltage during a period when the pulse signal is at the one logic level after the motor starts rotating, based on a rotation signal corresponding to the rotation of the motor. | 07-02-2009 |
20100033118 | Motor Drive Circuit - A motor drive circuit includes a first amplifier circuit to amplify a difference between first and second position detection signals with a gain becoming smaller according to drop in power supply voltage, to output a first amplification signal, the first and second position detection signals being signals indicating a rotational position of a rotor in a motor, having a frequency corresponding to a rotation speed of the motor, and being opposite in phase to each other; a second amplifier circuit to amplify the difference between the first and second position detection signals with the gain, to output a second amplification signal opposite in phase to the first amplification signal; and a drive circuit to amplify the difference between the first amplification signal and the second amplification signal with a predetermined gain to be saturated at the power supply voltage, to output a driving voltage for driving the motor. | 02-11-2010 |
20100181951 | MOTOR DRIVE CIRCUIT - The invention provides a motor with a low speed start function and a soft start function. The motor includes a first pulse generation circuit generating a first pulse signal of which a first duty ratio of one of logic levels is increased as a drive voltage corresponding the target rotation speed of the motor is increased, a second pulse generation circuit generating a second pulse signal of which a second duty ratio of one of logic levels is different from the first duty ratio, and a drive control circuit supplying a drive current to a motor coil at the second duty ratio in order to start the rotation of the motor that is stopping and supplying a drive current to the motor coil at the first duty ratio after a predetermined time passes from the start of the rotation of the motor in response to a rotation signal corresponding to the rotation of the motor. | 07-22-2010 |
20100219783 | MOTOR DRIVE CIRCUIT - This invention provides a motor drive circuit, which makes it possible to prevent braking when a power supply voltage is lower than a predetermined voltage while suppressing at a low cost a rise in a voltage on a power supply line when a kickback occurs. The motor drive circuit is formed to include first and second power supply lines connected with and shunted from a power supply, an H-bridge circuit, and a means to control the H-bridge circuit. The means controls the H-bridge circuit so that a regeneration path is not created in the H-bridge circuit when the power supply voltage is lower than a predetermined voltage. | 09-02-2010 |
Patent application number | Description | Published |
20120167127 | Video Output Device and Video Output Method - According to one embodiment, a video output device includes a receiver, a program guide obtaining module, an output signal processor, a user identification module, a view history storage module, and a program advice module. The receiver receives a broadcast signal of a program. The program guide obtaining module obtains program guide data. The output signal processor outputs a video signal of the broadcast signal to an output module. The user identification module identifies a user who is viewing the program. The view history storage module stores the program as view history in association with the user. The program advice module searches the program guide data for a recommended program similar to programs viewed by the user in the past using a keyword based on the view history and creates a program advice message suggesting the recommended program. The output signal processor outputs the program advice message to the output module. | 06-28-2012 |
20130247101 | Video Output Device and Video Output Method - According to one embodiment, a video output device includes a receiver, a program guide obtaining module, an output signal processor, a user identification module, a view history storage module, and a program advice module. The receiver receives a broadcast signal of a program. The program guide obtaining module obtains program guide data. The output signal processor outputs a video signal of the broadcast signal to an output module. The user identification module identifies a user who is viewing the program. The view history storage module stores the program as view history in association with the user. The program advice module searches the program guide data for a recommended program similar to programs viewed by the user in the past using a keyword based on the view history and creates a program advice message suggesting the recommended program. The output signal processor outputs the program advice message to the output module. | 09-19-2013 |