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公开(公告)号：US11750123B1
公开(公告)日：2023-09-05
申请号：US17841699
申请日：2022-06-16
Inventor： Ming-Fu Tsai
CPC classification number: H02P6/182 , H02P6/20 , H02P2203/03
Abstract: A control circuit arranged to detect an initial rotor position of a brushless DC motor includes: a voltage integrator circuit, arranged to perform integration upon an input voltage, to generate a plurality of integrated voltages; a PWM generating circuit, arranged to generate and output a plurality of PWM signals to the brushless DC motor through a drive circuit, and stop outputting a PWM signal that is any of the plurality of PWM signals to the brushless DC motor according to an integrated voltage corresponding to the PWM signal; a current receiving circuit, arranged to receive a plurality of feedback currents from the brushless DC motor; a comparison circuit, arranged to perform comparison upon the plurality of feedback currents, to generate a comparison result; and a decision circuit, arranged to detect the initial rotor position according to the comparison result.
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公开(公告)号：US20250060724A1
公开(公告)日：2025-02-20
申请号：US18235361
申请日：2023-08-18
Inventor： Ming-Fu Tsai , Sheng-Hung Hsu
IPC: G05B19/4062
Abstract: An inductor driving device includes multiple switching elements and a control circuit, wherein an inductor is driven according to switching of the multiple switching elements. The control circuit is arranged to generate a control signal for controlling the multiple switching elements. In a first mode, the control signal has a constant frequency. In a second mode, the control circuit adjusts a frequency of the control signal and continuously changes a current direction of the inductor, to generate one of multiple audio signals through the inductor.
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Patent Agency Ranking
公开(公告)号：US11777424B2
公开(公告)日：2023-10-03
申请号：US17494855
申请日：2021-10-06
Inventor： Shih-Chieh Wang , Yong-Yi Jhuang , Ming-Fu Tsai
CPC classification number: H02P6/186 , H02P2207/05
Abstract: A method for determining an initial rotor position of a permanent magnet synchronous motor (PMSM) includes: generating a plurality of transient currents by applying a plurality of voltages to each phase stator winding of a three phase stator winding of the PMSM; generating three phase current differences according to the plurality of transient currents; determining a first zone in which the initial rotor position of the PMSM is located according to the three phase current differences, wherein angles between 0-360 degrees are divided into a plurality of zones, and the first zone is selected from the plurality of zones; calculating three line current differences according to the three phase current differences; and determining the initial rotor position of the PMSM according to the first zone and the three line current differences.
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公开(公告)号：US11770080B1
公开(公告)日：2023-09-26
申请号：US17844692
申请日：2022-06-20
Inventor： Ming-Fu Tsai
Abstract: A method for increasing a resolution by N bits performed by a processing circuit of a motor driving system, where N is a positive integer, and the method includes: performing a conversion upon an analog command, to generate a command count value; performing a first N-bit right-shifting operation upon the command count value, to generate an initial output value; performing a logical operation upon the command count value, to generate a low bit value; generating an overflow value according to the low bit value; and determining a final output value according to the initial output value and the overflow value.
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公开(公告)号：US11482952B1
公开(公告)日：2022-10-25
申请号：US17496747
申请日：2021-10-07
Inventor： Shih-Chieh Wang , Yong-Yi Jhuang , Ming-Fu Tsai
Abstract: A method for determining zero crossing occurrence in an alternating current (AC) signal with constant frequency of a permanent magnet synchronous motor (PMSM) includes: sampling the AC signal to obtain a plurality of data points; starting to count a number of consecutive data points that have sampled values with a same sign in a detection range, to generate a count value, wherein the consecutive data points are included in the plurality of data points; determining whether the count value is equal to a zero crossing determination value; and in response to the count value being equal to the zero crossing determination value, determining that a zero crossing occurs at a last data point of the consecutive data points.
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公开(公告)号：US20240272616A1
公开(公告)日：2024-08-15
申请号：US18110340
申请日：2023-02-15
Inventor： Ming-Fu Tsai , Sheng-Hung Hsu
IPC: G05B19/4155
CPC classification number: G05B19/4155 , G05B2219/34013
Abstract: A control method applied to a servomotor, wherein the servomotor includes a motor, and the control method includes: setting a mode of the servomotor as a predetermined mode corresponding to a predetermined communication protocol; receiving an input signal from a controller for controlling the motor, wherein the controller is coupled to the servomotor; and switching the mode of the servomotor from the predetermined mode to one of a plurality of candidate modes according to a frequency of the input signal.
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公开(公告)号：US20230114056A1
公开(公告)日：2023-04-13
申请号：US17494855
申请日：2021-10-06
Inventor： Shih-Chieh Wang , Yong-Yi Jhuang , Ming-Fu Tsai
IPC: H02P6/18
Abstract: A method for determining an initial rotor position of a permanent magnet synchronous motor (PMSM) includes: generating a plurality of transient currents by applying a plurality of voltages to each phase stator winding of a three phase stator winding of the PMSM; generating three phase current differences according to the plurality of transient currents; determining a first zone in which the initial rotor position of the PMSM is located according to the three phase current differences, wherein angles between 0-360 degrees are divided into a plurality of zones, and the first zone is selected from the plurality of zones; calculating three line current differences according to the three phase current differences; and determining the initial rotor position of the PMSM according to the first zone and the three line current differences.
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