| Patent application number | Description | Published |
|---|
| 20090250751 | MOS DEVICE WITH LOW ON-RESISTANCE - Some of the embodiments of the present disclosure provide a metal oxide semiconductor (MOS) device comprising a drain region, a gate region surrounding the drain region and formed in a loop around the drain region, a plurality of source regions arranged around the gate region, wherein each source region is situated across from a corresponding side of the drain region, and a plurality of bulk regions arranged around the gate region, wherein one or more of the plurality of source regions separate one or more of the plurality of bulk regions from the gate region. Other embodiments are also described and claimed. | 10-08-2009 |
| 20100117571 | EXTERNAL DISTURBANCE DETECTION SYSTEM AND METHOD FOR TWO-PHASE MOTOR CONTROL SYSTEMS - A system includes a power control module, a period determination module, and a control module. The power control module controls current through stator coils of a motor to rotate a rotor. The period determination module determines a first length of time between a first set of induced stator coil voltages and determines a second length of time between a second set of induced stator coil voltages. The control module determines whether an external disturbance disturbs rotation of the rotor based on a difference between the first and second lengths of time. | 05-13-2010 |
| 20100119386 | MOTOR CONTROL SYSTEM - A control system for a fan includes a control housing that is external to a fan housing for the fan. At least one fan control module is within the control housing and communicates remotely with terminals within the fan housing via at least one wire. The at least one fan control module includes a detection module. The detection module detects induced voltages in at least one of a plurality of stator coils within the fan housing via the at least one wire without receiving signals from a sensor in the fan housing. | 05-13-2010 |
| 20100134055 | MOTOR SPEED CONTROL SYSTEM AND METHOD WITHOUT PULSE-WIDTH MODULATION - A motor control system includes a power control module and a detection module. The power control module controls power applied to first and second stator coils of a motor to rotate a rotor. The rotor induces voltages in the first and second stator coils when the rotor is rotating. The detection module determines a first time when a first voltage is induced in the first stator coil and determines a second time when a second voltage is induced in the second stator coil after the first voltage is induced. The detection module determines a speed of the rotor based on a difference between the first and second time. The power control module applies current through the second stator coil a predetermined period after the second time. The power control module determines the predetermined period based on the speed of the rotor. | 06-03-2010 |
| 20100215509 | SYSTEMS AND METHODS FOR PROGRAMMING OF A COOLING FAN VIA A SERIAL PORT COMMUNICATION MODE - Embodiments of the present disclosure provide a method that comprises, based upon receipt of a mode command, changing an operating mode of a fan motor controller of a fan to a serial port communication protocol, programming a memory of the fan motor controller with an operating parameter of the fan, and based upon receipt of a serial port command, changing the operating mode of the fan motor controller from the serial port communication protocol to another protocol. | 08-26-2010 |
| 20110038184 | Isolated AC-DC Converter with Master Controller on Secondary Side and Slave Controller on Primary Side - An isolated alternating current (AC)-direct current (DC) converter is disclosed. The isolated AC-DC converter comprises a slave control circuit including a slave driver module configured to receive a command and to control coupling of the slave control circuit to a primary-side inductor of a transformer based on the command, a master control circuit coupled to a secondary-side inductor of the transformer, the master control circuit including a master control module configured to sense a feedback voltage across a load and to generate the command based on the feedback voltage and a reference voltage, and a coupler configured to communicate the command from the master control module to the slave driver module and to provide isolation between the master control module and the slave driver module. | 02-17-2011 |
