Patents Assigned to Richtek Technology Corp.
  • Patent number: 10312818
    Abstract: A power converter determines a feedback signal according to a voltage signal related to an output voltage of the power converter and a reference voltage, thereby regulating the output voltage. A control circuit and method for programming the output voltage of the power converter utilize an offset current generator to inject a current or sink a current for changing the voltage signal or the reference signal, thereby adjusting the output voltage. As a result, it gets rid of complicated circuitry but provides more steps adjustment, which reduces related costs.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: June 4, 2019
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventor: Isaac Y. Chen
  • Patent number: 10312819
    Abstract: A power converter determines a feedback signal according to a voltage signal related to an output voltage of the power converter and a reference voltage, thereby regulating the output voltage. A control circuit and method for programming the output voltage of the power converter utilize an offset current generator to inject a current or sink a current for changing the voltage signal or the reference signal, thereby adjusting the output voltage. As a result, it gets rid of complicated circuitry but provides more steps adjustment, which reduces related costs.
    Type: Grant
    Filed: June 20, 2018
    Date of Patent: June 4, 2019
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventor: Isaac Y. Chen
  • Patent number: 10103632
    Abstract: A multiphase power converter has a plurality of phase circuits, each of which provides a phase current when being active. During single-phase operation of the multiphase power converter, an enhanced phase control circuit and method monitor the summation of the phase currents, and when the summation becomes higher than a threshold, switch the multiphase power converter to a higher power zone to increase the number of active phases. A high efficiency and high reliability multiphase power converter is thus accomplished.
    Type: Grant
    Filed: September 20, 2016
    Date of Patent: October 16, 2018
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventors: Hung-Shou Nien, Ting-Hung Wang, Cheng-Ching Hsu, Shang-Ying Chung
  • Patent number: 10014723
    Abstract: A power management unit, adapted to a wireless power system, includes: a rectifier, converts an AC power received by an input port thereof to a direct-current (DC) voltage outputted by a rectifying output terminal thereof; a first switch, wherein a first protecting capacitor is coupled between one terminal of the input port and a channel thereof; a second switch, wherein a second protecting capacitor is coupled between the other terminal of the input port and a channel thereof; a reference voltage terminal, for providing a reference voltage; and, a comparator, including two input terminals coupled to the rectifying output terminal and the reference voltage terminal respectively, and including an output terminal coupled to both the control terminals of the first switch and the second switch.
    Type: Grant
    Filed: April 22, 2014
    Date of Patent: July 3, 2018
    Assignee: RICHTEK TECHNOLOGY CORP
    Inventors: Wei-Jen Huang, Shui-Mu Lin
  • Patent number: 9907128
    Abstract: A control chip of a driving circuit for driving a LED array shares a ground terminal with the LED array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: February 27, 2018
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventors: Chang-Yu Wu, Wei-Ming Chiu
  • Patent number: 9871453
    Abstract: A feedback signal stabilized by a capacitor and related to an output voltage of a power converter is used to acquire the output power information of the power converter, and a control circuit uses a second clock not related to the switching frequency of the power converter to count a duration time of the feedback signal being higher than a threshold. When the duration time is higher than a preset time, an abnormal output power of the power converter is distinguished and the power converter will be turned off. The feedback signal will not vary severely even if the output terminal of the power converter is interfered, and the counted duration time will not be influenced when the switching frequency is changing caused by a load changing.
    Type: Grant
    Filed: September 16, 2016
    Date of Patent: January 16, 2018
    Assignee: Richtek Technology Corp.
    Inventor: Isaac Y. Chen
  • Patent number: 9858225
    Abstract: A method for reading/writing a chip in a USB type-C cable comprises converting a read/write command into unstructured vendor defined message (UVDM) that is conforming to a USB power delivery specification. Such UVDM will be delivered to the chip via a type-C configuration channel interface. The chip analyzes the UVDM to acquire the read/write command and reads or modifies the content of a non-volatile memory in the chip according to the read/write command. Due to use of the type-C configuration channel interface, which is inherent in the USB type-C cable, to read/write the chip, it needs no extra interface which otherwise increases costs.
    Type: Grant
    Filed: December 22, 2015
    Date of Patent: January 2, 2018
    Assignee: Richtek Technology Corp.
    Inventors: Chien-Chih Huang, Chia-Hwa Chan, Tsung-Nan Wu
  • Patent number: 9859783
    Abstract: A voltage converter controller, adapted to a voltage converter circuit, includes a power switch controller and a dead-time determining circuit. The power switch controller receives a PWM signal and outputs a high-side control signal and a low-side control signal accordingly to control the conduction and cut-off of a high-side power switch and a low-side power switch respectively. When the power switch controller starts to control the low-side power switch cut-off, after a first dead-time, the power switch controller starts to control the high-side power switch conducting. The dead-time determining circuit detects a current of the low-side power switch to be larger or smaller than a threshold current when the low-side power switch is conducted, and determines the first dead-time to be a first value or a second value accordingly.
    Type: Grant
    Filed: November 8, 2013
    Date of Patent: January 2, 2018
    Assignee: RICHTEK TECHNOLOGY CORP
    Inventors: Yu-Lun Chang, Yuan-Wen Hsiao, Jian-Rong Huang
  • Publication number: 20170366080
    Abstract: A voltage converter controller, adapted to a voltage converter circuit, includes a power switch controller and a dead-time determining circuit. The power switch controller receives a PWM signal and outputs a high-side control signal and a low-side control signal accordingly to control the conduction and cut-off of a high-side power switch and a low-side power switch respectively. When the power switch controller starts to control the low-side power switch cut-off, after a first dead-time, the power switch controller starts to control the high-side power switch conducting. The dead-time determining circuit detects a current of the low-side power switch to be larger or smaller than a threshold current when the low-side power switch is conducted, and determines the first dead-time to be a first value or a second value accordingly.
    Type: Application
    Filed: November 8, 2013
    Publication date: December 21, 2017
    Applicant: RICHTEK TECHNOLOGY CORP
    Inventors: Yu-Lun Chang, Yuan-Wen Hsiao, Jian-Rong Huang
  • Patent number: 9781786
    Abstract: A control circuit of a LED driver utilizes a counter to acquire a cycle and a conduction time or a non-conduction time of an AC phase-cut voltage outputted by a TRIAC dimmer. A bleeding signal is determined according to the cycle and the conduction time or the non-conduction time and used for adjusting a bleeding current so as to avoid a flickering of the LED. The control circuit does not need extra pins for coupling a large capacitor, but the bleeding signal can be still acquired. Preferably, the present invention is suitable for an IC of low pin numbers.
    Type: Grant
    Filed: January 27, 2016
    Date of Patent: October 3, 2017
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventors: Jyun-Che Ho, Isaac Y. Chen, Yi-Wei Lee
  • Patent number: 9779048
    Abstract: A method for reading/writing a chip in a USB type-C cable comprises converting a read/write command into unstructured vendor defined message (UVDM) that is conforming to a USB power delivery specification. Such UVDM will be delivered to the chip via a type-C configuration channel interface. The chip analyzes the UVDM to acquire the read/write command and reads or modifies the content of a non-volatile memory in the chip according to the read/write command. Due to use of the type-C configuration channel interface, which is inherent in the USB type-C cable, to read/write the chip, it needs no extra interface which otherwise increases costs.
    Type: Grant
    Filed: May 12, 2016
    Date of Patent: October 3, 2017
    Assignee: Richtek Technology Corp.
    Inventors: Chien-Chih Huang, Chia-Hwa Chan, Tsung-Nan Wu
  • Patent number: 9655185
    Abstract: A linear LED driver comprises a transistor having an input terminal coupled to a LED. When the transistor is turned on, the LED is lighted. The linear LED driver further includes a protection circuit for judging whether an instant high voltage variation occurs or not according to at least one of the voltages of a control terminal and an output terminal of the transistor so as to achieve a protection function.
    Type: Grant
    Filed: October 22, 2015
    Date of Patent: May 16, 2017
    Assignee: Richtek Technology Corp.
    Inventors: Jiun-Hung Pan, Tong-Cheng Jao, Yi-Wei Lee, Isaac Y. Chen
  • Patent number: 9654011
    Abstract: A feedback signal stabilized by a capacitor and related to an output voltage of a power converter is used to acquire the output power information of the power converter, and a control circuit uses a second clock not related to the switching frequency of the power converter to count a duration time of the feedback signal being higher than a threshold. When the duration time is higher than a preset time, an abnormal output power of the power converter is distinguished and the power converter will be turned off. The feedback signal will not vary severely even if the output terminal of the power converter is interfered, and the counted duration time will not be influenced when the switching frequency is changing caused by a load changing.
    Type: Grant
    Filed: April 24, 2015
    Date of Patent: May 16, 2017
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventor: Isaac Y. Chen
  • Patent number: 9647531
    Abstract: A soft-start switching power converter includes a voltage converting circuit and a soft-start circuit. The voltage converting circuit includes a transformer, and a first switch which includes a first terminal connected to the transformer, a second terminal providing a trigger signal, and a control terminal receiving a control signal, and which is controlled to switch between conduction and nonconduction, such that the transformer generates a feedback voltage. The soft-start circuit receives the trigger signal, generates the control signal according to the trigger signal, and determines whether or not to clamp the control signal at a preset voltage level based on the trigger signal.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: May 9, 2017
    Assignee: Richtek Technology Corp.
    Inventors: Tong-Cheng Jao, Yi-Wei Lee, Isaac Y. Chen
  • Patent number: 9629210
    Abstract: A control chip of a driving circuit for driving a LED array shares a ground terminal with the LED array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: April 18, 2017
    Assignee: Richtek Technology Corp.
    Inventors: Chang-Yu Wu, Wei-Ming Chiu
  • Patent number: 9568376
    Abstract: A temperature detecting circuit and method thereof, adapted to a voltage converter circuit which includes a current detecting circuit having a detecting output port outputting a current detecting signal proportional to an output current of the voltage converter circuit, includes: a current signal processing unit, having a signal input port coupling to the detecting output port, a first detecting output port generating a first processing signal with a first temperature coefficient, a second detecting output port generating a second processing signal with a second temperature coefficient, wherein the first and the second processing signals are proportional to the current detecting signal; and, a temperature calculating unit, receiving the first and the second processing signals and performing calculation to derive a temperature value.
    Type: Grant
    Filed: March 1, 2014
    Date of Patent: February 14, 2017
    Assignee: RICHTEK TECHNOLOGY CORP
    Inventors: Sheng-Fu Hsiao, Hung-Shou Nien, Kuang-Feng Li, Yu-Wei Chang
  • Patent number: 9479063
    Abstract: A frequency jittering control circuit for a PFM power supply includes a pulse frequency modulator to generate a frequency jittering control signal to switch a power switch to generate an output voltage. The frequency jittering control circuit jitters an input signal or an on-time or off-time of the pulse frequency modulator to jitter the switching frequency of the power switch to thereby improve EMI issue.
    Type: Grant
    Filed: August 6, 2012
    Date of Patent: October 25, 2016
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventors: Jiun-Hung Pan, Chien-Fu Tang, Isaac Y. Chen
  • Patent number: 9451661
    Abstract: A linear LED driver includes a voltage supply terminal providing a driving voltage, at least one first transistor, each of which has an input terminal coupled to a respective LED, and a bleeder circuit. When the voltage of the output terminal of each of the at least one first transistor is lower than a first threshold and a power voltage is higher than a second threshold, the bleeder circuit will generate a bleeder current to discharge the voltage supply terminal so as to prevent the LEDs from flickering. The bleeder circuit detects the voltage of the output terminal of each of the at least one first transistor. Therefore, whether the LEDs are lighted up can be confirmed so that the bleeder current can be provided at properly time point.
    Type: Grant
    Filed: February 8, 2016
    Date of Patent: September 20, 2016
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventors: Tong-Cheng Jao, Yi-Wei Lee, Jiun-Hung Pan, Isaac Y. Chen
  • Patent number: 9356518
    Abstract: An over-voltage protection circuit is applied to a switching voltage converting circuit. The switching voltage converting circuit manipulates an upper bridge power switch in the circuit, so as to convert an input voltage into an output voltage by an inductor. A channel of the upper bridge power switch and the inductor are coupled to a phase end. The over-voltage protection circuit includes: a comparator, coupled to the switching voltage converting circuit, wherein when a voltage of the phase end is higher than a voltage limiting threshold, an output end of the comparator outputs a first voltage level; and a pulse width detection unit, coupled to the output end of the comparator, wherein when the output end of the comparator remains the first voltage level for a time period longer than a protection period, the pulse width detection unit outputs an over-voltage protection activation signal.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: May 31, 2016
    Assignee: RICHTEK TECHNOLOGY CORP
    Inventors: An-Tung Chen, Li-Wen Fang, Chih-Hao Yang
  • Patent number: 9329613
    Abstract: A control circuit and method for an audio amplifier detect a signal for driving a speaker to control the switching frequency and the operation mode of a charge pump in the audio amplifier, to improve power efficiency of the audio amplifier. Preferably, a digital interface is further used to test the magnitude of the output signal of the audio amplifier, to reduce the costs of analog test. The charge pump has fewer switches and thus saves costs and die area of an integrated circuit. The control method needs only two phase control for the charge pump to generate a positive voltage and a negative voltage, and thus simplifies the operation of the circuit.
    Type: Grant
    Filed: January 3, 2013
    Date of Patent: May 3, 2016
    Assignee: RICHTEK TECHNOLOGY CORP.
    Inventor: Chia-Din Ting