Patents by Inventor Lan-Shan Cheng
Lan-Shan Cheng 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: 10152077Abstract: A voltage generating circuit including a pre-driving unit and a voltage generating unit is provided. The pre-driving unit receives an oscillation signal and enhances a driving capability of the oscillation signal to generate a pre-driving signal. The voltage generating unit receives an input signal and the pre-driving signal, and generates an output signal according to the input signal and the pre-driving signal. The voltage generating unit generates a voltage signal according to the pre-driving signal. One of the pre-driving unit and the voltage generating unit adjusts a slew rate or a ringing component of the voltage signal by using the pre-driving signal. A pre-driving signal generating module for driving a voltage generating circuit is also provided.Type: GrantFiled: March 11, 2015Date of Patent: December 11, 2018Assignee: Novatek Microelectronics Corp.Inventors: Hsiang-Yi Chiu, Lan-Shan Cheng
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Publication number: 20150355663Abstract: A voltage generating circuit including a pre-driving unit and a voltage generating unit is provided. The pre-driving unit receives an oscillation signal and enhances a driving capability of the oscillation signal to generate a pre-driving signal. The voltage generating unit receives an input signal and the pre-driving signal, and generates an output signal according to the input signal and the pre-driving signal. The voltage generating unit generates a voltage signal according to the pre-driving signal. One of the pre-driving unit and the voltage generating unit adjusts a slew rate or a ringing component of the voltage signal by using the pre-driving signal. A pre-driving signal generating module for driving a voltage generating circuit is also provided.Type: ApplicationFiled: March 11, 2015Publication date: December 10, 2015Inventors: Hsiang-Yi Chiu, Lan-Shan Cheng
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Patent number: 8742832Abstract: A multi-step charge pump having a power input terminal and a power output terminal is provided. The multi-step charge pump includes a plurality of capacitors, wherein each of the capacitors has a capacitance. A plurality of switching devices is connected among the capacitors, the power input terminal and the power output terminal. A switch-controlling unit controls the on/off states of the switches, wherein a charging-phase circuit corresponding to a pumping level is formed to charge the capacitors and an output-phase circuit is formed to output a voltage from the power output terminal. At least one of the capacitors herein is changeably selected as a voltage-regulating capacitor.Type: GrantFiled: September 23, 2008Date of Patent: June 3, 2014Assignee: Novatek Microelectronics Corp.Inventors: Chih-Yuan Hsieh, Lan-Shan Cheng
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Publication number: 20120104963Abstract: A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.Type: ApplicationFiled: January 11, 2012Publication date: May 3, 2012Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh, Lan-Shan Cheng
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Patent number: 8115408Abstract: A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.Type: GrantFiled: November 18, 2008Date of Patent: February 14, 2012Assignee: Novatek Microelectronics Corp.Inventors: Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh, Lan-Shan Cheng
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Patent number: 8111529Abstract: An over current protection circuit and a power converter using the same. The over current protection circuit includes a soft start cell and an operational amplifier. The soft start cell outputs a soft start signal according to a direct current (DC) level, and the soft start signal increases progressively to the DC level in a soft start interval. The operational amplifier outputs an over current signal to a feedback control circuit according to the soft start signal and an inductance current of a switching converter so that a duty cycle of a driving signal from the feedback control circuit increases progressively in the soft start interval.Type: GrantFiled: February 27, 2009Date of Patent: February 7, 2012Assignee: Novatek Microelectronics Corp.Inventors: Lan-Shan Cheng, Chih-Yuan Hsieh
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Patent number: 8018170Abstract: An LED driving module suitable to drive a plurality of LED strings in parallel connection is disclosed. The LED driving module includes a voltage converting apparatus, a conduction voltage detecting apparatus, a reference voltage generating apparatus and a current-adjusting apparatus. The voltage converting apparatus produces a driving voltage according to a conduction voltage. The conduction voltage detecting apparatus detects the conducting states of the LED strings for producing a conduction voltage and an enabling signal. The reference voltage generating apparatus generates a first reference voltage according to the enabling signal. The current-adjusting apparatus produces a plurality of driving currents according to the first reference voltage, and the driving currents flow through the LED strings.Type: GrantFiled: June 27, 2008Date of Patent: September 13, 2011Assignee: Novatek Microelectronics Corp.Inventors: Ke-Horng Chen, Chia-Lin Chiu, Lan-Shan Cheng
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Publication number: 20110101953Abstract: A control device for a switching power supply includes an frequency-hopping oscillator for generating an oscillating signal and an indication signal, an SR flip flop for outputting a driving signal according to the oscillating signal and the indication signal, to control a primary winding of a transformer of the switching power supply, a comparator for comparing a current sense signal of the primary winding and a subtraction result, to output the comparison result to the SR flip flop, a ramp generator for generating ramp signals with time-varying slopes, and a subtraction unit for performing a subtraction operation on a feedback signal and the ramp signals, to generate the subtraction result for the comparator.Type: ApplicationFiled: December 17, 2009Publication date: May 5, 2011Inventors: Lan-Shan Cheng, Chih-Yuan Hsieh
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Publication number: 20100289548Abstract: A frequency generator for generating signals with variable frequency includes a periodic signal generator for generating a periodic signal according to an output signal of the frequency generator, a first comparator for comparing the periodic signal and a first reference signal to output a first comparison result, a second comparator for comparing the periodic signal and a second reference signal to output a second comparison result, a logic unit for generating the output signal according to the first comparison result and the second comparison result, and a waveform generator for generating the first reference signal and the second reference signal according to a predetermined frequency variation trend to modulate a output frequency of the output signal.Type: ApplicationFiled: July 23, 2009Publication date: November 18, 2010Inventor: Lan-Shan Cheng
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Patent number: 7764525Abstract: An apparatus of dynamic feedback control charge pump is provided. The apparatus of dynamic feedback control charge pump receives an input voltage through a voltage regulator. The voltage regulator regulates the input voltage to a base voltage according to a control signal. The charge pump receives the base voltage and provides multiple of the base voltage to an output voltage. A feedback unit provides the control signal to the voltage regulator according to the output voltage.Type: GrantFiled: May 29, 2008Date of Patent: July 27, 2010Assignee: Novatek Microelectronics Corp.Inventors: Chih-Yuan Hsieh, Lan-Shan Cheng
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Publication number: 20100117618Abstract: An over current protection circuit and a power converter using the same. The over current protection circuit includes a soft start cell and an operational amplifier. The soft start cell outputs a soft start signal according to a direct current (DC) level, and the soft start signal increases progressively to the DC level in a soft start interval. The operational amplifier outputs an over current signal to a feedback control circuit according to the soft start signal and an inductance current of a switching converter so that a duty cycle of a driving signal from the feedback control circuit increases progressively in the soft start interval.Type: ApplicationFiled: February 27, 2009Publication date: May 13, 2010Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Lan-Shan Cheng, Chih-Yuan Hsieh
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Publication number: 20100039842Abstract: A power conversion system and a power conversion method thereof. The power conversion system includes a driving unit, a control unit, a first direct current (DC) power supply circuit and a second DC power supply circuit. The control unit controls the driving unit to drive a load. The first DC power supply circuit converts an alternating current (AC) power into a first DC power outputted to the driving unit, and the second DC power supply circuit converts the AC power into a second DC power outputted to the control unit.Type: ApplicationFiled: January 14, 2009Publication date: February 18, 2010Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Yi-Te LIU, Chih-Yuan Hsieh, Chih-Jen Yen, Lan-Shan Cheng
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Publication number: 20090315475Abstract: A light source apparatus and a light source adjusting module are provided. The light source apparatus includes a power supply, a phase modulator, an electrical transformer, a light source adjusting module and a light-emitting device. The power supply provides a first AC voltage signal. The phase modulator receives the first AC voltage signal and adjusts a conducting phase of the first AC voltage signal to generate a modulated AC voltage signal. The electrical transformer transforms the modulated AC voltage signal to generate a second AC voltage signal. The light adjusting module generates a luminance adjusting signal according to a state of the second AC voltage signal. The light-emitting device receives the luminance adjusting signal to generate a corresponding light source.Type: ApplicationFiled: November 18, 2008Publication date: December 24, 2009Applicant: Novatek Microelectronics Corp.Inventors: Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh, Lan-Shan Cheng
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Publication number: 20090261743Abstract: An LED driving module suitable to drive a plurality of LED strings in parallel connection is disclosed. The LED driving module includes a voltage converting apparatus, a conduction voltage detecting apparatus, a reference voltage generating apparatus and a current-adjusting apparatus. The voltage converting apparatus produces a driving voltage according to a conduction voltage. The conduction voltage detecting apparatus detects the conducting states of the LED strings for producing a conduction voltage and an enabling signal. The reference voltage generating apparatus generates a first reference voltage according to the enabling signal. The current-adjusting apparatus produces a plurality of driving currents according to the first reference voltage, and the driving currents flow through the LED strings.Type: ApplicationFiled: June 27, 2008Publication date: October 22, 2009Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Ke-Horng Chen, Chia-Lin Chiu, Lan-Shan Cheng
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Publication number: 20090256626Abstract: A multi-step charge pump having a power input terminal and a power output terminal is provided. The multi-step charge pump includes a plurality of capacitors, wherein each of the capacitors has a capacitance. A plurality of switching devices is connected among the capacitors, the power input terminal and the power output terminal. A switch-controlling unit controls the on/off states of the switches, wherein a charging-phase circuit corresponding to a pumping level is formed to charge the capacitors and an output-phase circuit is formed to output a voltage from the power output terminal. At least one of the capacitors herein is changeably selected as a voltage-regulating capacitor.Type: ApplicationFiled: September 23, 2008Publication date: October 15, 2009Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Chih-Yuan Hsieh, Lan-Shan Cheng
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Publication number: 20090237046Abstract: An apparatus of dynamic feedback control charge pump is provided. The apparatus of dynamic feedback control charge pump receives an input voltage through a voltage regulator. The voltage regulator regulates the input voltage to a base voltage according to a control signal. The charge pump receives the base voltage and provides multiple of the base voltage to an output voltage. A feedback unit provides the control signal to the voltage regulator according to the output voltage. Therefore, the apparatus of dynamic feedback control charge pump can reduce the output voltage ripple and improve the output efficiency of the charge pump.Type: ApplicationFiled: May 29, 2008Publication date: September 24, 2009Applicant: NOVATEK MICROELECTRONICS CORP.Inventors: Chih-Yuan Hsieh, Lan-Shan Cheng