Patents by Inventor Ying Yin
Ying Yin has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7102327Abstract: A technique for reconstructing phase currents based on measurements of a DC bus current. Non-observable regions of DC bus current samples to reconstruct phase currents are reduced in size by using two phase space vector modulation. The non-observable regions can be further reduced by omitting deadtime insertions for switch actuations when output current is higher than a given threshold. Voltage command vectors in non-observable areas can be constructed by two time averaged vectors one of which is constructed to obtain an observable DC bus current reflecting motor phase current. The additive vectors have the same combined time average value as that of the voltage command vector in order to preserve volt-seconds. Current samples may also be averaged to provide a more accurate reconstruction of phase current. Current samples are time delayed to avoid transients for more accurate readings.Type: GrantFiled: May 10, 2005Date of Patent: September 5, 2006Assignee: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Patent number: 7066034Abstract: A method of determining a rotor angle in a drive control for a motor, comprising the steps of (a) determining a rotor magnetic flux in the motor; (b) estimating the rotor angle on the basis of the rotor magnetic flux; and (c) correcting the estimated rotor angle on the basis of reactive power input to the motor. Step (a) may include the step of non-ideal integration of stator voltage and current values. Step (b) may include the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F). Step (c) may include the steps of (1) calculating a first reactive power input value as 1.5*We*(C_Lq*I*I) and a second reactive power input value as 1.5*(Vq*id?Vd*iq); (2) determining a difference between said first and second reactive power input values; and (3) applying said difference to the rotor angle estimated in step (b) to obtain a corrected rotor angle. At higher motor frequencies, the estimated rotor angle is based on the rotor magnetic flux.Type: GrantFiled: April 20, 2004Date of Patent: June 27, 2006Assignee: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Patent number: 7061195Abstract: A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.Type: GrantFiled: July 24, 2003Date of Patent: June 13, 2006Assignee: International Rectifier CorporationInventors: Eddy Ying Yin Ho, Yong Li, Jun Honda, David C. Tam, Toshio Takahashi
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Publication number: 20060087292Abstract: A new methodology for dealing with the Electric-Magnetic Anti-skid Braking System (EMABS) and recycling the regenerating energy on braking is proposed. Developing a dynamic damper which comprising positive and negative type resistors connected in series becomes a fast switch with adaptation, attenuation and fast recovery system properties, is a crucial turnkey. For braking purpose, the most general configuration is to couple the fast switches to the stator and rotor coils in an AC alternator that is driven by the vehicle's wheels or propellers. After performing the dynamic impedance matching in this braking system, the EMABS effect and recycling of the regenerating energy on braking are accordingly obtained.Type: ApplicationFiled: December 6, 2005Publication date: April 27, 2006Inventors: Yen-Weay Hsu, Tsun-Cheng Lin, Jiunn-Huei Chen, Ying-Yin Ting
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Patent number: 6979967Abstract: A method and system for modifying an estimated rotor angle for improved efficiency in a PMSM drive system. A module monitors a run command, a torque command, and an estimated speed; and in response thereto, generates an output correction angle for modifying the estimated rotor angle. The output correction angle may be added to the estimated rotor angle. The output correction angle may be generated only for predetermined conditions of said run command, torque command, and speed. In particular, the output correction angle may be generated (1) when the run command is asserted, (2) when the torque command is above a predetermined level, and (3) when variations in the speed are within predetermined limits.Type: GrantFiled: February 14, 2005Date of Patent: December 27, 2005Assignee: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Publication number: 20050168067Abstract: The “Dynamic-Adaptive-Damping-Attenuant Mechanism”, which is called DADAM, is as the bridge of the mechanical-electrical interconnected system. Not only the DADAM is as the dynamic buffer zone and the size is regulated adaptively and proportional to the load, but also provides the self attenuation area with attenuating the superabundant energy. This is the key why the superabundant braking energy could be recycled. Such as the system could be stable and more reliable, even the over limited load, as the shock of high voltage, occurred. For appling to the vehicle braking system, the distance of braking is shortened.Type: ApplicationFiled: January 29, 2004Publication date: August 4, 2005Inventors: Yen-Weay Hsu, Tsun-Cheng Lin, Jiunn-Huei Chen, Ying-Yin Ting
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Patent number: 6910389Abstract: A method of determining a rotor angle in a drive control for a motor, comprising the steps of (a) determining a rotor magnetic flux in the motor; (b) estimating the rotor angle on the basis of the rotor magnetic flux; and (c) correcting the estimated rotor angle on the basis of reactive power input to the motor. Step (a) may include the step of non-ideal integration of stator voltage and current values. Step (b) may include the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F). Step (c) may include the steps of (1) calculating a first reactive power input value as 1.5*We*(C_Lq*I*I) and a second reactive power input value as 1.5*(Vq*id?Vd*iq); (2) determining a difference between said first and second reactive power input values; and (3) applying said difference to the rotor angle estimated in step (b) to obtain a corrected rotor angle.Type: GrantFiled: November 12, 2002Date of Patent: June 28, 2005Assignee: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Patent number: 6899799Abstract: Increased sidewall coverage by a sputtered material is achieved by generating an ionizing plasma in a relatively low pressure sputtering gas. By reducing the pressure of the sputtering gas, it is believed that the ionization rate of the deposition material passing through the plasma is correspondingly reduced which in turn is believed to increase the sidewall coverage by the underlayer. Although the ionization rate is decreased, sufficient bottom coverage of the by the material is maintained. In an alternative embodiment, increased sidewall coverage by the material may be achieved even in a high density plasma chamber by generating the high density plasma only during an initial portion of the material deposition. Once good bottom coverage has been achieved, the RF power to the coil generating the high density plasma may be turned off entirely and the remainder of the deposition conducted without the high density plasma.Type: GrantFiled: October 2, 2002Date of Patent: May 31, 2005Assignee: Applied Materials, Inc.Inventors: Kenny King-Tai Ngan, Ying Yin Hui, Seshadri Ramaswami
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Patent number: 6856109Abstract: A method and system for modifying an estimated rotor angle for improved efficiency in a PMSM drive system. A module monitors a run command, a torque command, and an estimated speed; and in response thereto, generates an output correction angle for modifying the estimated rotor angle. The output correction angle may be added to the estimated rotor angle. The output correction angle may be generated only for predetermined conditions of said run command, torque command, and speed. In particular, the output correction angle may be generated (1) when the run command is asserted, (2) when the torque command is above a predetermined level, and (3) when variations in the speed are within predetermined limits.Type: GrantFiled: October 14, 2003Date of Patent: February 15, 2005Assignee: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Publication number: 20040249596Abstract: A method of determining a rotor angle in a drive control for a motor, comprising the steps of (a) determining a rotor magnetic flux in the motor; (b) estimating the rotor angle on the basis of the rotor magnetic flux; and (c) correcting the estimated rotor angle on the basis of reactive power input to the motor. Step (a) may include the step of non-ideal integration of stator voltage and current values. Step (b) may include the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F). Step (c) may include the steps of (1) calculating a first reactive power input value as 1.5*We*(C_Lq *I*I) and a second reactive power input value as 1.5*(Vq*id−Vd*iq); (2) determining a difference between said first and second reactive power input values; and (3) applying said difference to the rotor angle estimated in step (b) to obtain a corrected rotor angle. At higher motor frequencies, the estimated rotor angle is based on the rotor magnetic flux.Type: ApplicationFiled: April 20, 2004Publication date: December 9, 2004Applicant: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Patent number: 6819078Abstract: A space vector pulse-width modulator (SVPWM) and a method implemented by the modulator. A precalculation module accepts Ua and Ub modulation indexes and in response thereto, outputs modified Ua and Ub information; a sector finder has a U module which receives the modified Ua information and outputs a U sector; and a Z module which receives the U sector and the modified Ub information and outputs a Z sector. The U sector and the Z sector are 2-phase control signals for implementing 2-phase modulation. For 3-phase modulation, the SVPWM and method further possess an active vectors calculation module and an assign vectors module which receive the modified Ua and Ub information and the U sector, and which calculate active vectors for 3-phase modulation; a zero vector selector which receives the Z sector and calculates zero vectors for 3-phase modulation; and a PWM counter block which receives the active vectors and zero vectors and outputs 3-phase control signals for implementing 3-phase modulation.Type: GrantFiled: October 14, 2003Date of Patent: November 16, 2004Assignee: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Patent number: 6777907Abstract: A method and apparatus for regulating a harmonic current component of an inverter fed motor drive system comprises measuring a phase current of the motor, substantially eliminating the fundamental component of the phase current, demodulating the phase current having the fundamental component substantially eliminated to produce a first current signal and providing the first current signal to a PWM control input of an inverter drive of the inverter fed motor drive system to affect the inverter output voltage by driving a first harmonic current of the motor substantially to zero thereby to achieve harmonic current control. More accurate, estimated motor voltages can also be provided by the system.Type: GrantFiled: October 31, 2002Date of Patent: August 17, 2004Assignee: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Publication number: 20040130918Abstract: A space vector pulse-width modulator (SVPWM) and a method implemented by the modulator. A precalculation module accepts Ua and Ub modulation indexes and in response thereto, outputs modified Ua and Ub information; a sector finder has a U module which receives the modified Ua information and outputs a U sector; and a Z module which receives the U sector and the modified Ub information and outputs a Z sector. The U sector and the Z sector are 2-phase control signals for implementing 2-phase modulation. For 3-phase modulation, the SVPWM and method further possess an active vectors calculation module and an assign vectors module which receive the modified Ua and Ub information and the U sector, and which calculate active vectors for 3-phase modulation; a zero vector selector which receives the Z sector and calculates zero vectors for 3-phase modulation; and a PWM counter block which receives the active vectors and zero vectors and outputs 3-phase control signals for implementing 3-phase modulation.Type: ApplicationFiled: October 14, 2003Publication date: July 8, 2004Applicant: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Publication number: 20040130923Abstract: A motor drive system control provides global closed loop feedback to cooperatively operate system components to adaptively reduce noise and provide noise cancellation feedback. An active EMI filter reduces differential and common mode noise on an input and provides a noise level indication to a system controller. Power switches in both a power converter and power inverter are cooperatively controlled with dynamic dv/dt control to reduce switching noise according to a profile specified by the controller. The dv/dt control is provided as an analog signal to a high voltage IC and codified as a pulse width for a level shifting circuit supplying control signals to the high voltage gate drive. A noise extraction circuit and technique obtain fast noise sampling to permit noise cancellation and adaptive noise reduction.Type: ApplicationFiled: July 24, 2003Publication date: July 8, 2004Inventors: Eddy Ying Yin Ho, Yong Li, Jun Honda, David C. Tam, Toshio Takahashi
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Publication number: 20040124809Abstract: A method and system for modifying an estimated rotor angle for improved efficiency in a PMSM drive system. A module monitors a run command, a torque command, and an estimated speed; and in response thereto, generates an output correction angle for modifying the estimated rotor angle. The output correction angle may be added to the estimated rotor angle. The output correction angle may be generated only for predetermined conditions of said run command, torque command, and speed. In particular, the output correction angle may be generated (1) when the run command is asserted, (2) when the torque command is above a predetermined level, and (3) when variations in the speed are within predetermined limits.Type: ApplicationFiled: October 14, 2003Publication date: July 1, 2004Applicant: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Patent number: 6633144Abstract: A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative processing loop being performed n times. The iterative processing loop includes regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current; operating in a closed loop mode to determine a first field firing angle and a second field firing angle; operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle; and determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.Type: GrantFiled: December 27, 2001Date of Patent: October 14, 2003Assignee: General Electric Co.Inventors: Sidney A. Barker, Eddy Ying Yin Ho
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Publication number: 20030122513Abstract: A system and method determine the parameters of a field of a DC motor. The method comprises obtaining parameters of the DC motor; and performing an iterative processing loop, the iterative processing loop being performed n times. The iterative processing loop includes regulating field current based on the parameters of the DC motor, and calculating a field resistance from a field voltage and the field current measured during the regulating of the field current; operating in a closed loop mode to determine a first field firing angle and a second field firing angle; operating in an open loop mode to determine a first time constant and a second time constant based on applying the first field firing angle and the second field firing angle; and determining at least one parameter of the field of the DC motor based on the first time constant, the second time constant, and the calculated field resistance.Type: ApplicationFiled: December 27, 2001Publication date: July 3, 2003Applicant: General Electric CompanyInventors: Sidney A. Barker, Eddy Ying Yin Ho
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Publication number: 20030090262Abstract: A method of determining a rotor angle in a drive control for a motor, comprising the steps of (a) determining a rotor magnetic flux in the motor; (b) estimating the rotor angle on the basis of the rotor magnetic flux; and (c) correcting the estimated rotor angle on the basis of reactive power input to the motor. Step (a) may include the step of non-ideal integration of stator voltage and current values. Step (b) may include the step of correcting phase errors caused by said non-ideal integration via a PLL circuit with phase compensation (F). Step (c) may include the steps of (1) calculating a first reactive power input value as 1.5*We*(C_Lq*I*I) and a second reactive power input value as 1.5*(Vq*id−Vd*iq); (2) determining a difference between said first and second reactive power input values; and (3) applying said difference to the rotor angle estimated in step (b) to obtain a corrected rotor angle.Type: ApplicationFiled: November 12, 2002Publication date: May 15, 2003Applicant: International Rectifier CorporationInventor: Eddy Ying Yin Ho
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Publication number: 20030090232Abstract: A method and apparatus for regulating a harmonic current component of an inverter fed motor drive system comprises measuring a phase current of the motor, substantially eliminating the fundamental component of the phase current, demodulating the phase current having the fundamental component substantially eliminated to produce a first current signal and providing the first current signal to a PWM control input of an inverter drive of the inverter fed motor drive system to affect the inverter output voltage by driving a first harmonic current of the motor substantially to zero thereby to achieve harmonic current control. More accurate, estimated motor voltages can also be provided by the system.Type: ApplicationFiled: October 31, 2002Publication date: May 15, 2003Applicant: International RectifierInventor: Eddy Ying Yin Ho
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Patent number: 6559654Abstract: A method and system for determining an inductance value of an inductive element are presented. The method includes energizing the inductive element using an N-pulse AC to DC converter in electrical communication with the inductive element and an AC source. The method further includes determining at each of a plurality of periodic time intervals an inductive element voltage value, an inductive element current value, and an equivalent source phase angle. An Nth harmonic impedance squared value is then determined for the inductive element using the inductive element voltage and current values and the equivalent source phase angles. The inductive element inductance value is then calculated using the Nth harmonic impedance squared value and an AC source frequency value.Type: GrantFiled: March 29, 2001Date of Patent: May 6, 2003Assignee: General Electric CompanyInventors: Eddy Ying Yin Ho, Craig William Moyer, Luis Jose Garces Rivera