Patents by Inventor Chih-Shih Yang
Chih-Shih Yang 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: 10608426Abstract: High temperature protection system includes a thermal detection and control circuit, a pulse width modulation signal output circuit, a driving circuit, and a coil module. The thermal detection and control circuit is used for detecting a temperature and outputting at least one corresponding control signal. The pulse width modulation signal output circuit is coupled to the thermal detection and control circuit for generating a pulse width modulation signal according to the at least one control signal. The driving circuit is coupled to the pulse width modulation signal for generating at least one driving voltage. The coil module is coupled to the driving circuit and is operated according to the at least one driving voltage.Type: GrantFiled: November 21, 2016Date of Patent: March 31, 2020Assignee: Prolific Technology Inc.Inventors: Wan-Yang Chen, Chih-Shih Yang, Jia-Jun Liu
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Patent number: 10338652Abstract: A high voltage protection system includes a high voltage processing circuit, a pulse width modulation signal outputting circuit, a driving circuit, and a coil module. The high voltage processing circuit is used for receiving and processing a high voltage. The pulse width modulation signal output circuit is coupled to the high voltage processing circuit for generating a pulse width modulation signal. The driving circuit is coupled to the pulse width modulation signal outputting circuit for receiving the pulse width modulation signal and generating a driving voltage accordingly. The coil module is coupled to the driving circuit and is operated according to the driving voltage.Type: GrantFiled: April 17, 2016Date of Patent: July 2, 2019Assignee: Prolific Technology Inc.Inventors: Wan-Yang Chen, Chih-Shih Yang, Jia-Jun Liu
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Patent number: 9859837Abstract: A negative voltage protection system includes a negative voltage comparison circuit, a signal processing circuit, a driving circuit, a driving output circuit, a power device, and a coil module. When the coil module generates a back electromotive force, the coil module outputs a negative voltage. When an intensity of the negative voltage detected by the negative voltage comparison circuit is greater than a predetermined value, the signal processing circuit generates a control signal to the driving circuit. The driving circuit controls the driving output circuit and the power device to reduce the intensity of the negative voltage according to the control signal.Type: GrantFiled: December 1, 2016Date of Patent: January 2, 2018Assignee: Prolific Technology Inc.Inventors: Chih-Shih Yang, Jia-Jun Liu, Wan-Yang Chen
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Publication number: 20170214357Abstract: A negative voltage protection system includes a negative voltage comparison circuit, a signal processing circuit, a driving circuit, a driving output circuit, a power device, and a coil module. When the coil module generates a back electromotive force, the coil module outputs a negative voltage. When an intensity of the negative voltage detected by the negative voltage comparison circuit is greater than a predetermined value, the signal processing circuit generates a control signal to the driving circuit. The driving circuit controls the driving output circuit and the power device to reduce the intensity of the negative voltage according to the control signal.Type: ApplicationFiled: December 1, 2016Publication date: July 27, 2017Inventors: Chih-Shih Yang, Jia-Jun Liu, Wan-Yang Chen
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Publication number: 20170194785Abstract: High temperature protection system includes a thermal detection and control circuit, a pulse width modulation signal output circuit, a driving circuit, and a coil module. The thermal detection and control circuit is used for detecting a temperature and outputting at least one corresponding control signal. The pulse width modulation signal output circuit is coupled to the thermal detection and control circuit for generating a pulse width modulation signal according to the at least one control signal. The driving circuit is coupled to the pulse width modulation signal for generating at least one driving voltage. The coil module is coupled to the driving circuit and is operated according to the at least one driving voltage.Type: ApplicationFiled: November 21, 2016Publication date: July 6, 2017Inventors: Wan-Yang Chen, Chih-Shih Yang, Jia-Jun Liu
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Publication number: 20160315466Abstract: A high voltage protection system includes a high voltage processing circuit, a pulse width modulation signal outputting circuit, a driving circuit, and a coil module. The high voltage processing circuit is used for receiving and processing a high voltage. The pulse width modulation signal output circuit is coupled to the high voltage processing circuit for generating a pulse width modulation signal. The driving circuit is coupled to the pulse width modulation signal outputting circuit for receiving the pulse width modulation signal and generating a driving voltage accordingly. The coil module is coupled to the driving circuit and is operated according to the driving voltage.Type: ApplicationFiled: April 17, 2016Publication date: October 27, 2016Inventors: Wan-Yang Chen, Chih-Shih Yang, Jia-Jun Liu
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Patent number: 9184746Abstract: A contactless switch provided by the present disclosure is coupled to a signal input device and receives a magnetic signal generated by a magnetic trigger mechanism. The contactless switch includes: a magnetic sensor, for sensing the magnetic signal and generating a corresponding trigger control signal; a controller, for generating a switch signal according to the trigger control signal; and a mode switch module, for processing the input signal to generate an output signal according to the switch signal.Type: GrantFiled: February 23, 2011Date of Patent: November 10, 2015Assignee: PROLIFIC TECHNOLOGY INC.Inventor: Chih-Shih Yang
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Publication number: 20110221550Abstract: A contactless switch provided by the present disclosure is coupled to a signal input device and receives a magnetic signal generated by a magnetic trigger mechanism. The contactless switch includes: a magnetic sensor, for sensing the magnetic signal and generating a corresponding trigger control signal; a controller, for generating a switch signal according to the trigger control signal; and a mode switch module, for processing the input signal to generate an output signal according to the switch signal.Type: ApplicationFiled: February 23, 2011Publication date: September 15, 2011Applicant: Prolific Technology INC.Inventor: Chih-Shih Yang
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Publication number: 20080303482Abstract: A multi charging current control circuit including a voltage reference unit, a current limiting unit, a current detector and a current control unit is provided. The voltage reference unit provides many reference voltages. The current limiting unit selects a corresponding reference voltage from the reference voltages according to a charge mode signal and outputs a control signal according to the corresponding reference voltage. The current detector detects a first and a second charging current. The current control unit controls the first charging current and the second charging current according to the control signal. The current detector feedbacks the first charging current and the second charging current detected to the current control unit, such that the current control unit adjusts the first charging current or the second charging current to make the sum of the first charging current and the second charging current less than or equal to a constant value.Type: ApplicationFiled: January 14, 2008Publication date: December 11, 2008Applicant: Prolific Technology Inc.Inventors: Chih-Shih Yang, Ying-Lei Lee
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Patent number: 7250735Abstract: A driving circuit of a fan includes a magnetic pole sensor for generating a magnetic pole sensing signal, a first waveform generator coupled to the magnetic pole sensor for generating a first waveform according to the magnetic pole sensing signal, a second waveform generator for generating a second waveform, a comparison circuit coupled to the first waveform generator and the second waveform generator for comparing the first waveform and the second waveform for generating a third waveform, a control signal generator coupled to the comparison circuit for generating a control signal according to the third waveform and an external signal, and a current generator coupled to the magnetic pole sensor and the control signal generator for outputting current to a coil of a stator of the fan according to the magnetic pole sensing signal and the control signal.Type: GrantFiled: February 9, 2006Date of Patent: July 31, 2007Assignee: Prolific Technology Inc.Inventors: Chih-Shih Yang, Kung-Ching Hung
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Publication number: 20070138984Abstract: A driving circuit of a fan includes a magnetic pole sensor for generating a magnetic pole sensing signal, a first waveform generator coupled to the magnetic pole sensor for generating a first waveform according to the magnetic pole sensing signal, a second waveform generator for generating a second waveform, a comparison circuit coupled to the first waveform generator and the second waveform generator for comparing the first waveform and the second waveform for generating a third waveform, a control signal generator coupled to the comparison circuit for generating a control signal according to the third waveform and an external signal, and a current generator coupled to the magnetic pole sensor and the control signal generator for outputting current to a coil of a stator of the fan according to the magnetic pole sensing signal and the control signal.Type: ApplicationFiled: February 9, 2006Publication date: June 21, 2007Inventors: Chih-Shih Yang, Kung-Ching Hung
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Patent number: 7019473Abstract: A noiseless driving circuit for direct current (DC) motor is disclosed. The driving circuit uses a magnetic-field sensing circuit with a Hall sensor to sense the corresponding position of the permanent magnet rotor. According to the corresponding position of the permanent magnet rotor, a linear circuit generates a signal with trapezoid waveform for driving the coil of the DC motor. The coils of the DC motor perform soft switching operations without resulting backing electromotive force (BEMF). Therefore, the noise during the operation of the DC motor can be substantially reduced.Type: GrantFiled: June 17, 2004Date of Patent: March 28, 2006Assignee: Prolific Technology Inc.Inventors: Chih-Shih Yang, Kung-Ching Hung
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Publication number: 20040227475Abstract: A noiseless driving circuit for direct current (DC) motor is disclosed. The driving circuit uses a magnetic-field sensing circuit with a Hall sensor to sense the corresponding position of the permanent magnet rotor. According to the corresponding position of the permanent magnet rotor, a linear circuit generates a signal with trapezoid waveform for driving the coil of the DC motor. The coils of the DC motor perform soft switching operations without resulting backing electromotive force (BEMF). Therefore, the noise during the operation of the DC motor can be substantially reduced.Type: ApplicationFiled: June 17, 2004Publication date: November 18, 2004Inventors: Chih-Shih Yang, Kung-Ching Hung
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Publication number: 20030210007Abstract: An input power control device for controlling the electrical power fed into the driven device from the power supply is provided. The power control device includes a driving device, a voltage detector, a current detector, a multiplier, and a power controller. The voltage detector detects the output voltage of the power supply, while the current detector detects the drive current fed into the driven device from the driving device. The multiplier multiplies the voltage signal and the current signal together to obtain the present electrical power input to the driven device. If the present input power of the driven device is too high, the power controller outputs an adjustment signal to the driving device to decrease the drive current of the driven device until the input power is equal to the rated value.Type: ApplicationFiled: April 30, 2003Publication date: November 13, 2003Inventors: Chia-Chang Hsu, Yen-John Chen, Chih-Shih Yang
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Patent number: 6617818Abstract: A DC brushless motor operation speed control method is disclosed. First, a linearly voltage dependent current source is used to charge a capacitor and the terminal voltage of the capacitor is coupled to a linearly voltage dependent base frequency level detector. When the output voltage of the capacitor reaches the base frequency reference voltage, the signal output from the base frequency level detector will make the capacitor discharge, outputting a series of base frequency triangular waves. Under different supply voltages, all the generated base frequency triangular waves have the same cycle time. The base frequency triangular waves are transmitted to a speed control comparator. Through pulse width modulation, the speed control reference voltage adjusts the output pulse width of the comparator and thereby controls the speed of the motor.Type: GrantFiled: August 10, 2001Date of Patent: September 9, 2003Assignee: Prolific Technology Inc.Inventors: Chia-Chang Hsu, Chih-Shih Yang
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Publication number: 20030034747Abstract: A method for driving a brushless DC motor is disclosed in accordance with the present invention. Firstly, a driving control signal is generated based on sensed information of a motor rotor's magnetic field distribution. The driving control signal is inactive in the case that four rotor magnetic arcs are rotated more or less than critical positions of the rotor corresponding a stator. At that time, no magnetic fields are produced from the motor's stator, and thus the rotor rotates by inertial force. In another case, the driving control signal is issued in a conventional manner.Type: ApplicationFiled: August 16, 2001Publication date: February 20, 2003Applicant: PROLIFIC TECHNOLOGY INC.Inventors: Chia-Chang Hsu, Chih-Shih Yang
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Patent number: 6522093Abstract: A method for driving a brushless DC motor is disclosed in accordance with the present invention. Firstly, a driving control signal is generated based on sensed information of a motor rotor's magnetic field distribution. The driving control signal is inactive in the case that four rotor magnetic arcs are rotated more or less than critical positions of the rotor corresponding a stator. At that time, no magnetic fields are produced from the motor's stator, and thus the rotor rotates by inertial force. In another case, the driving control signal is issued in a conventional manner.Type: GrantFiled: August 16, 2001Date of Patent: February 18, 2003Assignee: Prolific Technology, Inc.Inventors: Chia-Chang Hsu, Chih-Shih Yang
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Publication number: 20020024399Abstract: A DC brushless motor operation speed control method is disclosed. First, a linearly voltage dependent current source is used to charge a capacitor and the terminal voltage of the capacitor is coupled to a linearly voltage dependent base frequency level detector. When the output voltage of the capacitor reaches the base frequency reference voltage, the signal output from the base frequency level detector will make the capacitor discharge, outputting a series of base frequency triangular waves. Under different supply voltages, all the generated base frequency triangular waves have the same cycle time. The base frequency triangular waves are transmitted to a speed control comparator. Through pulse width modulation, the speed control reference voltage adjusts the output pulse width of the comparator and thereby controls the speed of the motor.Type: ApplicationFiled: August 10, 2001Publication date: February 28, 2002Applicant: PROLIFIC TECHNOLOGY INC.Inventors: Chia-Chang Hsu, Chih-Shih Yang