Patents by Inventor Ming-Chung Li

Ming-Chung Li 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).

  • Publication number: 20190187942
    Abstract: A tray device includes a host module, a tray module, and a communication module communicated between the host module and the tray module. The host module includes a host recognition circuit, a host connection circuit, and a host controller electrically connected to the host recognition circuit and the host connection circuit. The tray module includes a tray recognition circuit, a tray connection circuit, and a tray controller electrically connected to the tray recognition circuit and the tray connection circuit. The tray controller determines an installation ordinal number corresponding to the tray module according to a recognition signal generated by the tray recognition circuit. The tray controller sends the installation ordinal number to the host controller by the communication module when the tray connection circuit generates a connection signal.
    Type: Application
    Filed: November 11, 2018
    Publication date: June 20, 2019
    Inventors: Jen-Chieh Ho, Ming-Chung Li
  • Patent number: 10310423
    Abstract: A heating roller includes: a roller cylinder rotatably disposed; a base rotatably disposed in the roller cylinder; first to third heaters, which are mounted on the base and respectively have a first heating section, a second heating section and a third heating section extending respectively in directions substantially parallel to an axial direction of the roller cylinder; and a driving mechanism, which is connected to the base and rotates the base to multiple position states. An image forming apparatus using the heating roller is also disclosed.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: June 4, 2019
    Assignee: Avision Inc.
    Inventors: Yen-Cheng Chen, Ming Chung Li
  • Publication number: 20190152241
    Abstract: A paper tray includes a casing, a lifting mechanism, a weight detector, a storage unit, and a control unit. An accommodating space is formed inside the casing. The lifting mechanism is disposed inside the accommodating space for supporting and lifting at least one sheet of paper. The weight detector is disposed on the lifting mechanism for detecting a weight of the at least one sheet of paper. The storage unit is for storing paper information and a predetermined amount. The control unit is electrically connected to the weight detector and the storage unit. The control unit determines an amount of the at least one sheet of paper according to relation of the weight and the paper information and outputs a supplementary alert to an apparatus for reminding users when the control unit determines the amount of the at least one sheet of paper is less than the predetermined amount.
    Type: Application
    Filed: September 27, 2018
    Publication date: May 23, 2019
    Inventors: Ming-Chung Li, Yu-Lang Wang, Kuang-Huan Li, Xiang-Chi Lee
  • Publication number: 20190011859
    Abstract: A heating roller includes: a roller cylinder rotatably disposed; a base rotatably disposed in the roller cylinder; first to third heaters, which are mounted on the base and respectively have a first heating section, a second heating section and a third heating section extending respectively in directions substantially parallel to an axial direction of the roller cylinder; and a driving mechanism, which is connected to the base and rotates the base to multiple position states. An image forming apparatus using the heating roller is also disclosed.
    Type: Application
    Filed: June 8, 2018
    Publication date: January 10, 2019
    Inventors: Yen-Cheng CHEN, Ming Chung LI
  • Patent number: 9124232
    Abstract: A gain controlling system, a sound playback system, and a gain controlling method thereof are disclosed. The gain controlling system includes a main gain control unit, a sub gain control unit, and a logic control unit. The main gain control unit has a first step-by-step adjusting magnitude; the sub gain control unit has a second step-by-step adjusting magnitude; wherein the second step-by-step adjusting magnitude is smaller than the first step-by-step adjusting magnitude. The logic control unit is used for controlling the main and the sub gain control unit to transform an analog signal into a converted signal according to an adjustment command signal and further determining whether an adjusting magnitude required by the adjustment command signal is larger than a maximum gain range of the sub gain control unit. If yes, the logic control unit controls the main control unit and the sub gain control unit repeatedly.
    Type: Grant
    Filed: October 29, 2013
    Date of Patent: September 1, 2015
    Assignee: Princeton Technology Corporation
    Inventors: Ming-Chung Li, Yi-Fan Shih, I-Chi Lin
  • Patent number: 9065398
    Abstract: An amplifying circuit capable of suppressing spikes of an audio signal includes an integration module, a comparison module, an output module, a feedback module, and a limiting module. The integration module is used for receiving an input signal and generating a first voltage signal corresponding to the input signal. The comparison module is coupled to the integration module for receiving the first voltage signal and a reference signal, and generating a comparison signal. The output module is coupled to the comparison module for generating an audio signal according to the comparison signal. The feedback module is coupled between the output module and the integration module for feeding back an output signal to the integration module. The limiting module is coupled between the feedback module and the integration module for limiting the comparison signal to be within a predetermined range.
    Type: Grant
    Filed: November 7, 2012
    Date of Patent: June 23, 2015
    Assignee: Princeton Technology Corporation
    Inventors: Yung-Ming Lee, Ming-Chung Li
  • Publication number: 20140363023
    Abstract: A gain controlling system, a sound playback system, and a gain controlling method thereof are disclosed. The gain controlling system includes a main gain control unit, a sub gain control unit, and a logic control unit. The main gain control unit has a first step-by-step adjusting magnitude; the sub gain control unit has a second step-by-step adjusting magnitude; wherein the second step-by-step adjusting magnitude is smaller than the first step-by-step adjusting magnitude. The logic control unit is used for controlling the main and the sub gain control unit to transform an analog signal into a converted signal according to an adjustment command signal and further determining whether an adjusting magnitude required by the adjustment command signal is larger than a maximum gain range of the sub gain control unit. If yes, the logic control unit controls the main control unit and the sub gain control unit repeatedly.
    Type: Application
    Filed: October 29, 2013
    Publication date: December 11, 2014
    Applicant: Princeton Technology Corporation
    Inventors: Ming-Chung LI, Yi-Fan SHIH, I-Chi LIN
  • Patent number: 8872581
    Abstract: A class-D power amplifier capable of reducing electromagnetic interference includes an integrator, a triangular wave generator, a comparator, a gate driver, a feedback circuit, and an output stage circuit. The integrator is used for receiving an input signal and potential of ground, and outputting a first voltage. The comparator is used for comparing the first voltage with a triangular wave generated by the triangular wave generator to output a pulse-width modulation signal. The gate driver is used for driving the output stage circuit to output an output voltage according to the pulse-width modulation signal. Therefore, the class-D power amplifier reduces the electromagnetic interference by the triangular wave.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: October 28, 2014
    Assignee: Princeton Technology Corporation
    Inventors: Yung-Ming Lee, Ming-Chung Li
  • Publication number: 20130335143
    Abstract: A class-D power amplifier capable of reducing electromagnetic interference includes an integrator, a triangular wave generator, a comparator, a gate driver, a feedback circuit, and an output stage circuit. The integrator is used for receiving an input signal and potential of ground, and outputting a first voltage. The comparator is used for comparing the first voltage with a triangular wave generated by the triangular wave generator to output a pulse-width modulation signal. The gate driver is used for driving the output stage circuit to output an output voltage according to the pulse-width modulation signal. Therefore, the class-D power amplifier reduces the electromagnetic interference by the triangular wave.
    Type: Application
    Filed: February 4, 2013
    Publication date: December 19, 2013
    Applicant: PRINCETON TECHNOLOGY CORPORATION
    Inventors: Yung-Ming Lee, Ming-Chung Li
  • Publication number: 20130156232
    Abstract: An amplifying circuit capable of suppressing spikes of an audio signal includes an integration module, a comparison module, an output module, a feedback module, and a limiting module. The integration module is used for receiving an input signal and generating a first voltage signal corresponding to the input signal. The comparison module is coupled to the integration module for receiving the first voltage signal and a reference signal, and generating a comparison signal. The output module is coupled to the comparison module for generating an audio signal according to the comparison signal. The feedback module is coupled between the output module and the integration module for feeding back an output signal to the integration module. The limiting module is coupled between the feedback module and the integration module for limiting the comparison signal to be within a predetermined range.
    Type: Application
    Filed: November 7, 2012
    Publication date: June 20, 2013
    Inventors: Yung-Ming Lee, Ming-Chung Li
  • Patent number: 8249272
    Abstract: An audio playback apparatus is disclosed. The audio playback apparatus processes an audio signal and provides at least one output signal to at least one speaker or an earphone connected to a phone-jack. The audio playback apparatus comprises a clock generating module, a processing module, an amplifier module, and a detecting module. The processing module is connected to the clock generating module and processes the audio signal to generate a processed signal according to a clock signal generated by the clock generating module. The amplifier module amplifies the processed signal to generate an output signal. The detecting module detects whether the earphone is plugged in the phone-jack. If the earphone is plugged in the phone-jack, the amplifier module provides the output signal to the earphone. If not, the amplifier module provides the output signal to the speaker.
    Type: Grant
    Filed: May 8, 2008
    Date of Patent: August 21, 2012
    Assignee: Princeton Technology Corporation
    Inventors: Ming-Hsiung Chen, Shang-Shu Chung, Ming-Chung Li
  • Patent number: 8243957
    Abstract: An audio control apparatus. The audio control apparatus comprises a processing module, an amplification module, and a control module. The processing module receives and processes an audio signal according to a control signal, and generates a processed signal. The amplification module coupled to the processing module, amplifies the processed signal to generate an output signal. The control module coupled to the processing module and the amplification module, receives the output signal to generate the control signal.
    Type: Grant
    Filed: October 12, 2007
    Date of Patent: August 14, 2012
    Assignee: Princeton Technology Corporation
    Inventor: Ming-Chung Li
  • Patent number: 8170217
    Abstract: An audio signal processing apparatus is provided. The audio signal processing apparatus comprises a clock generator, a processing module, an amplifying module and an output module. The clock generator is used for generating a clock signal. The processing module is coupled to the clock generator for processing the clock signal and generating a processing signal. The amplifying module is coupled to the processing module for amplifying the processing signal and generating an amplifying signal. The output module is coupled to the amplifying module for outputting the amplifying signal.
    Type: Grant
    Filed: January 17, 2008
    Date of Patent: May 1, 2012
    Assignee: Princeton Technology Corporation
    Inventors: Ming-Hsiung Chen, Shang-Shu Chung, Ming-Chung Li
  • Patent number: 8144880
    Abstract: An audio amplifier includes a plurality of sub-audio amplifier sets, a clock source, and a speaker. When the audio amplifier is under an audio amplify mode, the plurality of sub-audio amplifier sets is operated under a synchronic operating frequency with a same clock signal generated by the clock source. When the audio amplifier is under a self-oscillation mode, the clock signal is isolated from being input to the plurality of sub-audio amplifier sets. A higher distortion is prevented by repeatedly charging and discharging an oscillating capacitor of a sub-audio amplifier in a sub-audio amplifier set.
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: March 27, 2012
    Assignee: Princeton Technology Corporation
    Inventors: Ming-Hsiung Chen, Shang-Shu Chung, Ming-Chung Li
  • Patent number: 7844061
    Abstract: In a speaker system, pulse width modulation signals are utilized for driving said speaker system, and duty cycles of both left audio channel signals and right audio channel signals of an earphone in said speaker system are modulated by said pulse width modulation signals. When the left audio channel or the right audio channel of the earphone has no inputted audio signals with the abovementioned modulated duty cycles, the speaker system may be prevented from unnecessary power consumption. Besides, audio signals from both the left audio channel and the right audio channel of the earphone and outputted from the speaker system may thus be synchronized further by both the pulse width modulation signals and a sawtooth wave source for generating said pulse width modulation signals, for reducing noise and increasing an output audio quality of the speaker system. The abovementioned speaker system is preferably utilized for a Class D amplifier.
    Type: Grant
    Filed: January 8, 2007
    Date of Patent: November 30, 2010
    Assignee: Princeton Technology Corporation
    Inventors: Ming-Hsiung Chen, Shang-Shu Chung, Ming-Chung Li
  • Publication number: 20100166192
    Abstract: The invention provides an integrated circuit for reducing radio frequency interference due to antenna effects. In one embodiment, the integrated circuit includes a pre-stage audio processor and a post-stage power amplifier. The pre-stage audio processor receives a left channel input signal and a right channel input signal, processes the left channel input signal to obtain a positive left channel signal and a negative left channel signal, and processes the right channel input signal to obtain a positive right channel signal and a negative right channel signal. The post-stage power amplifier amplifies the positive left channel signal and the negative left channel signal to obtain a left channel output signal, and amplifies the positive right channel signal and the negative right channel signal to obtain a right channel output signal.
    Type: Application
    Filed: December 31, 2009
    Publication date: July 1, 2010
    Inventors: Li-Ying CHANG, Ming-Chung Li
  • Publication number: 20090154731
    Abstract: An audio playback apparatus is disclosed. The audio playback apparatus processes an audio signal and provides at least one output signal to at least one speaker or an earphone connected to a phone-jack. The audio playback apparatus comprises a clock generating module, a processing module, an amplifier module, and a detecting module. The processing module is connected to the clock generating module and processes the audio signal to generate a processed signal according to a clock signal generated by the clock generating module. The amplifier module amplifies the processed signal to generate an output signal. The detecting module detects whether the earphone is plugged in the phone-jack. If the earphone is plugged in the phone-jack, the amplifier module provides the output signal to the earphone. If not, the amplifier module provides the output signal to the speaker.
    Type: Application
    Filed: May 8, 2008
    Publication date: June 18, 2009
    Inventors: Ming-Hsiung CHEN, Shang-Shu Chung, Ming-Chung Li
  • Publication number: 20090074210
    Abstract: An audio signal processing apparatus is provided. The audio signal processing apparatus comprises a clock generator, a processing module, an amplifying module and an output module. The clock generator is used for generating a clock signal. The processing module is coupled to the clock generator for processing the clock signal and generating a processing signal. The amplifying module is coupled to the processing module for amplifying the processing signal and generating an amplifying signal. The output module is coupled to the amplifying module for outputting the amplifying signal.
    Type: Application
    Filed: January 17, 2008
    Publication date: March 19, 2009
    Inventors: Ming-Hsiung Chen, Shang-Shu Chung, Ming-Chung Li
  • Publication number: 20090016546
    Abstract: An audio control apparatus. The audio control apparatus comprises a processing module, an amplification module, and a control module. The processing module receives and processes an audio signal according to a control signal, and generates a processed signal. The amplification module coupled to the processing module, amplifies the processed signal to generate an output signal. The control module coupled to the processing module and the amplification module, receives the output signal to generate the control signal.
    Type: Application
    Filed: October 12, 2007
    Publication date: January 15, 2009
    Inventor: Ming-Chung Li
  • Patent number: 7420422
    Abstract: After coupling a first voltage source to a voltage supply circuit, a second voltage source having a same electrical level but an opposite electrical pole with said first voltage source is generated. An audio amplifier is then driven by both the first voltage source and the second voltage source, where said audio amplifier requires a pair of voltage sources having the same electrical level but opposite electrical poles to be driven. The voltage supply circuit generates the second voltage source from the first voltage source by simultaneously switching two sets of switches, where said both sets of switches have non-synchronous statuses in switching.
    Type: Grant
    Filed: January 10, 2007
    Date of Patent: September 2, 2008
    Assignee: Princeton Technology Corporation
    Inventors: Ming-Hsiung Chen, Shang-Shu Chung, Ming-Chung Li