Patents by Inventor Hidenori Kobayashi

Hidenori Kobayashi 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).

  • Patent number: 10749433
    Abstract: A solution is provided for a current balance feedback method to improve stability in a multi-phase DC-DC switching converter, where the current balance feedback signal is added to the PWM duty signal, after the PWM comparator. Using this feedback method, current balance oscillation issues caused by the non-linearity of the main control loop can be solved, and provide better current balance stability in the switching converter. Advantages include improving the stability of the current balance feedback loop by introducing the correction post PW modulation in the time domain, effectively bypassing interaction with the PW modulator. The current balance feedback loop stability improvement reduces PCB design effort and iteration.
    Type: Grant
    Filed: September 14, 2018
    Date of Patent: August 18, 2020
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Hidenori Kobayashi, Seiichi Ozawa, Daisuke Kobayashi
  • Publication number: 20200091819
    Abstract: A solution is provided for a current balance feedback method to improve stability in a multi-phase DC-DC switching converter, where the current balance feedback signal is added to the PWM duty signal, after the PWM comparator. Using this feedback method, current balance oscillation issues caused by the non-linearity of the main control loop can be solved, and provide better current balance stability in the switching converter. Advantages include improving the stability of the current balance feedback loop by introducing the correction post PW modulation in the time domain, effectively bypassing interaction with the PW modulator. The current balance feedback loop stability improvement reduces PCB design effort and iteration.
    Type: Application
    Filed: September 14, 2018
    Publication date: March 19, 2020
    Inventors: Hidenori Kobayashi, Seiichi Ozawa, Daisuke Kobayashi
  • Patent number: 10250128
    Abstract: A transient response circuit provides faster transient response time of an electronic device so that less overshoot or undershoot of an output signal of the electronic device occurs when a large load and/or line transient signal is present at an input and/or output terminal of the electronic device. The transient response circuit has a transient detection circuit and an assist circuit. The transient detection circuit monitors a feedback signal applied to an input terminal of the control stage, and generates transient detection signals indicating that detection of a large load and/or line transient signal has occurred. The assist circuit communicates receives the transient detection signal and charges or discharges a loop filter capacitor of the control stage for causing the control stage to regulate the output signal to decrease overshoot or undershoot upon receipt of the transient detection signal.
    Type: Grant
    Filed: March 9, 2016
    Date of Patent: April 2, 2019
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Naoyuki Unno, Soichiro Ohyama, Hidenori Kobayashi
  • Publication number: 20190095143
    Abstract: In accordance with an embodiment, an integrated circuit comprises a plurality of general-purpose terminals, a first register, a second register and an assignment section. The first register stores a value indicating a state of the general-purpose terminal. The second register stores a value of a register indicated by an address based on the assigned address. The assignment section configured to assign addresses of at least a part of the first registers among the first registers as addresses to be stored in the second register adjacently to a predetermined address in the second register and addresses subsequent to the predetermined address based on connection with the general-purpose terminal.
    Type: Application
    Filed: September 25, 2017
    Publication date: March 28, 2019
    Inventor: Hidenori Kobayashi
  • Patent number: 10008918
    Abstract: A system is disclosed which provides the minimization of peak-to-peak output voltage ripple in multi-phase DC-DC switching converters, with two or more different value inductors (asymmetric inductors), by the optimization of phase-shifting determined by the inductance on each phase. An object of the disclosure is to ensure both the AC accuracy of the output voltage and the efficiency of the DC-DC switching converter is increased. The output voltage ripple improvement is shown to be dependent on the duty-cycle. Another object of the disclosure is to minimize the total inductor current ripple and improving the efficiency of the DC-DC switching converter by reducing the capacitor loss. Still another object of the disclosure is to minimize the output voltage ripple in the multi-phase DC-DC switching converter by ensuring the sum of the inductor current vectors is equal to zero.
    Type: Grant
    Filed: October 25, 2016
    Date of Patent: June 26, 2018
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Santhos Ario Wibowo, Hidenori Kobayashi, Seiichi Ozawa, Hidechika Yokoyama
  • Publication number: 20180115236
    Abstract: A system is disclosed which provides the minimization of peak-to-peak output voltage ripple in multi-phase DC-DC switching converters, with two or more different value inductors (asymmetric inductors), by the optimization of phase-shifting determined by the inductance on each phase. An object of the disclosure is to ensure both the AC accuracy of the output voltage and the efficiency of the DC-DC switching converter is increased. The output voltage ripple improvement is shown to be dependent on the duty-cycle. Another object of the disclosure is to minimize the total inductor current ripple and improving the efficiency of the DC-DC switching converter by reducing the capacitor loss. Still another object of the disclosure is to minimize the output voltage ripple in the multi-phase DC-DC switching converter by ensuring the sum of the inductor current vectors is equal to zero.
    Type: Application
    Filed: October 25, 2016
    Publication date: April 26, 2018
    Inventors: Santhos Ario Wibowo, Hidenori Kobayashi, Seiichi Ozawa, Hidechika Yokoyama
  • Patent number: 9935553
    Abstract: A circuit and method for power converter for improved current monitoring, comprising a buck converter comprising a high side switch, a current sensing circuits parallel to the buck converter configured to sense a current through a low side switch, and a positive slope inductor coil estimator sensing circuit parallel to a buck converter configured to estimate a current magnitude.
    Type: Grant
    Filed: April 17, 2015
    Date of Patent: April 3, 2018
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Jindrich Svorc, Hidenori Kobayashi
  • Publication number: 20180031280
    Abstract: A sealed refrigerant compressor comprises an electric component and a compression component accommodated in a sealed container, and the compression component includes a cylinder and a piston which is reciprocatable inside the cylinder. The electric component includes a stator, and a rotor having a lower surface facing an oil surface of lubricating oil. The rotor has a shape in which its diameter is larger than its length in a rotational axis direction thereof. A core of the rotor is provided with at least one balance hole for adjusting a load balance during rotation of the rotor, for example, at least one balance through-hole.
    Type: Application
    Filed: January 13, 2017
    Publication date: February 1, 2018
    Inventors: Hidenori KOBAYASHI, Masaki SUMI, Terumasa IDE, Akihiko KUBOTA
  • Patent number: 9774251
    Abstract: Systems and methods for providing a boost converter with an improved stability are disclosed. A sample and hold circuit is connected to the output of the boost converter. That sample and hold circuit holds the output voltage before the main switch of the boost converter turns ON and holds the voltage while the main switch is ON. Thus a high frequency oscillation can be eliminated, an increased control bandwidth without stability problems can be achieved, and no complicated additional circuit is required.
    Type: Grant
    Filed: December 30, 2010
    Date of Patent: September 26, 2017
    Assignee: Dialog Semiconductor GmbH
    Inventor: Hidenori Kobayashi
  • Patent number: 9768688
    Abstract: A multi-phase DC-to-DC converter is configured to achieve fast transient response and to optimize efficiency over the load range. Phase shedding changes the active number of phases according to output currents. Each phase of the converter has an inductor configured to optimize the efficiency for a range of load currents in which that phase is used. A converter may have 3 phases, the first used only in sleep mode and has a large inductance with low AC losses, the second used in sync mode at low currents and having a lower inductance with low AC losses, the third phase is used in sync mode at high currents and has small inductance with low DC losses. The number of phases is ?2.
    Type: Grant
    Filed: October 14, 2013
    Date of Patent: September 19, 2017
    Assignee: Dialog Semiconductor GmbH
    Inventors: Andrew Repton, Hidenori Kobayashi, Mark Childs, Jindrich Svorc
  • Publication number: 20170264190
    Abstract: A transient response circuit provides faster transient response time of an electronic device so that less overshoot or undershoot of an output signal of the electronic device occurs when a large load and/or line transient signal is present at an input and/or output terminal of the electronic device. The transient response circuit has a transient detection circuit and an assist circuit. The transient detection circuit monitors a feedback signal applied to an input terminal of the control stage, and generates transient detection signals indicating that detection of a large load and/or line transient signal has occurred. The assist circuit communicates receives the transient detection signal and charges or discharges a loop filter capacitor of the control stage for causing the control stage to regulate the output signal to decrease overshoot or undershoot upon receipt of the transient detection signal.
    Type: Application
    Filed: March 9, 2016
    Publication date: September 14, 2017
    Inventors: Naoyuki Unno, Soichiro Ohyama, Hidenori Kobayashi
  • Patent number: 9755517
    Abstract: A control circuit included within a multi-phase switched-mode converter is configured for adjusting operational signals for adding power stages of the multi-phase switched-mode converter to dynamically respond to transient changes in load current for minimizing undershoot while avoiding overshoot of an output voltage of the multi-phase switched-mode converter. The control circuit has panic comparators configured such that each panic comparator has an input terminal connected to receive the output voltage for comparison with one of a plurality of reference voltages. A panic controller receives panic indicator signals from the panic comparators and determines which of the power stages are to be activated to match the transient change to the load current to prevent for minimizing undershoot and for preventing overshoot of the output voltage of the multi-phase switched-mode converter. The multi-phase switched-mode converter may operate in a continuous or discontinuous conduction mode.
    Type: Grant
    Filed: December 16, 2015
    Date of Patent: September 5, 2017
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Hidenori Kobayashi, Hyungtaek Chang
  • Patent number: 9693417
    Abstract: Measurement circuits which are configured to measure wide ranges of the input voltage using a sensed input voltage of the driver circuits for solid state lighting (SSL) devices are presented. The measurement circuit comprises a first resistor which is coupled at a first side to the input voltage. The measurement circuit comprises current mirror circuitry coupled at an input to a second side of the first resistor, and which translates an input current at the input of the current mirror circuitry into an output current at an output of the current mirror circuitry, such that the output current is proportional to the input current by a current mirror ratio. The measurement circuit comprises a second resistor coupled to the output of the current mirror circuitry and to provide the sensed input voltage, when the input voltage is coupled to the first side of the first resistor.
    Type: Grant
    Filed: January 14, 2015
    Date of Patent: June 27, 2017
    Assignee: Dialog Semiconductor (UK) Limited
    Inventors: Horst Knoedgen, Julian Tyrrell, Hidenori Kobayashi
  • Publication number: 20170179822
    Abstract: A control circuit included within a multi-phase switched-mode converter is configured for adjusting operational signals for adding power stages of the multi-phase switched-mode converter to dynamically respond to transient changes in load current for minimizing undershoot while avoiding overshoot of an output voltage of the multi-phase switched-mode converter. The control circuit has panic comparators configured such that each panic comparator has an input terminal connected to receive the output voltage for comparison with one of a plurality of reference voltages. A panic controller receives panic indicator signals from the panic comparators and determines which of the power stages are to be activated to match the transient change to the load current to prevent for minimizing undershoot and for preventing overshoot of the output voltage of the multi-phase switched-mode converter. The multi-phase switched-mode converter may operate in a continuous or discontinuous conduction mode.
    Type: Application
    Filed: December 16, 2015
    Publication date: June 22, 2017
    Inventors: Hidenori Kobayashi, Hyungtaek Chang
  • Patent number: 9520788
    Abstract: An apparatus and method for a multi-phase switch regulator with improved efficiency is disclosed. The device has parallel implementations for the different phases comprising a driver, a current sense variable gain amplifier, a current share circuit, a pulse width modulation (PWM) control circuit, a trim network, and an inductor. A method is disclosed of providing a system with current sharing function comprising a driver circuit, a current sense circuit, a current share circuit, a PWM control circuit and a trim circuit, providing a current sense circuit for each segment of a driver circuit, sensing a signal using a current sense circuit for each segment of a driver circuit, comparing the output of the current sense circuit, providing the current error information to a PWM controller, generating a PWM drive signal of each phase, and finally, equalizing the output of the current sense amplifier. Other methods that utilize dummy output stages and low pass filter feedback is disclosed.
    Type: Grant
    Filed: August 26, 2014
    Date of Patent: December 13, 2016
    Assignee: Dialog Semiconductor (UK) Limited
    Inventor: Hidenori Kobayashi
  • Publication number: 20160306371
    Abstract: A circuit and method for power converter for improved current monitoring, comprising a buck converter comprising a high side switch, a current sensing circuits parallel to the buck converter configured to sense a current through a low side switch, and a positive slope inductor coil estimator sensing circuit parallel to a buck converter configured to estimate a current magnitude.
    Type: Application
    Filed: April 17, 2015
    Publication date: October 20, 2016
    Inventors: Jindrich Svorc, Hidenori Kobayashi
  • Patent number: 9471077
    Abstract: Compensation capacitor voltages of DC-to-DC converters are pre-set without switching to enable smooth transition from sleep mode to active mode. Appropriate compensation capacitor voltages are set regardless of the length of no-switching sleep period or input voltage change. Therefore the converter can always start with appropriate error amplifier and duty conditions, and avoid output voltage disturbance when the PWM control loop takes over in active mode the control of buck converter. The appropriate capacitor voltages are enabled by creating a local PWM feedback loop of a PWM control loop without enabling the output stage. This local PWM feedback loop works intermittently and always sets the appropriate voltage for the error amplifier and compensation capacitor.
    Type: Grant
    Filed: October 30, 2014
    Date of Patent: October 18, 2016
    Assignee: Dialog Semiconductor (UK) Limited
    Inventor: Hidenori Kobayashi
  • Patent number: 9471084
    Abstract: An apparatus and method for a bandgap voltage reference circuit with improved operation for a low voltage power supply. A bandgap voltage reference circuit which is operable at low power supply voltage for power supplies of 1.3V comprising of a first npn bipolar transistor, a second npn bipolar transistor, a third npn bipolar transistor, a first resistor, a second resistor, a third resistor, a fourth resistor, and a first, second and third p-channel MOSFET. The matched second resistor and third resistor, and the first and third npn bipolar transistor pair establishes a ?Vbe dependent current (a PTAT current), and the fourth resistor established a ?Vbe to establish a bandgap voltage of approximately 1.2V.
    Type: Grant
    Filed: February 17, 2014
    Date of Patent: October 18, 2016
    Assignee: Dialog Semiconductor (UK) Limited
    Inventor: Hidenori Kobayashi
  • Publication number: 20160273579
    Abstract: A sealed compressor of the present invention comprises a sealed container (101) accommodating an electric component (105) and a compression component (106) and storing lubricating oil (102); wherein the compression component (106) includes a shaft (110) including a main shaft section (111), a main bearing unit (120), and a thrust ball bearing (132); wherein the main shaft section (111) is provided with a first oil feeding passage (150) to transport the lubricating oil (102); the thrust ball bearing (132) includes a cage (133), balls (134), an upper race (135) and a lower race (136), and the thrust ball bearing (132) is provided with a second oil feeding passage (160) communicated with the first oil feeding passage (150) and configured to feed the lubricating oil (102) to the raceway groove provided in at least one of the upper race (135) and the lower race (136), and a discharge passage (180) through which the lubricating oil (102) is discharged.
    Type: Application
    Filed: May 31, 2016
    Publication date: September 22, 2016
    Inventors: Hironari AKASHI, Terumasa IDE, Kousuke TSUBOI, Kiwamu WATANABE, Hidenori KOBAYASHI, Makoto KATAYAMA, Yasushi HAYASHI
  • Patent number: 9423811
    Abstract: A switching regulator with an output high threshold voltage setting and an output low threshold voltage setting that permits a plurality of different operating modes to be established. Combined with these two threshold voltages is the ability to adjust both threshold voltages over the full range of the regulator output voltage, which yields switching regulator modes of forced normal operation, automatic where the operating mode is dependent upon output current and forced sleep mode.
    Type: Grant
    Filed: March 8, 2013
    Date of Patent: August 23, 2016
    Assignee: Dialog Semiconductor GmbH
    Inventor: Hidenori Kobayashi