1
George A Hariman, Kenji Tomiyoshi: Synchronized frequency multiplier for multiple phase PWM control switching regulator without using a phase locked loop. National Semiconductor Corporation, John W Branch, Darby & Darby PC, July 11, 2006: US07075346 (57 worldwide citation)

A method and circuit for synchronizing an input clock signal with a plurality of internal clock signals in a multiple phase Pulse Width Modulation (PWM) switching power supply without using a Phase Locked Loop (PLL). A period of the input clock signal is measured by using a frequency to voltage conv ...


2
Kenji Tomiyoshi: Apparatus and method for step-down switching voltage regulation. National Semiconductor Corporation, Darby & Darby PC, Matthew M Gaffney, May 16, 2006: US07045993 (39 worldwide citation)

A current mode PWM buck regulator is provided. The regulator includes a top-side transistor, a bottom-side transistor, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the low-side transistor is sensed by ...


3
Kenji Tomiyoshi: Apparatus and method for switching voltage regulation. National Semiconductor Corporation, Darby and Darby PC, Matthew M Gaffney, May 13, 2008: US07372241 (21 worldwide citation)

A regulator is provided. The regulator includes a main switch, a synchronous switch, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the synchronous switch is sensed by the current sense amplifier. Also, ...


4
Kenji Tomiyoshi: Apparatus and method for step-down switching voltage regulation. National Semiconductor Corporation, Darby & Darby PC, Matthew M Gaffney, October 10, 2006: US07119522 (18 worldwide citation)

A current mode PWM buck regulator is provided. The regulator includes a top-side transistor, a bottom-side transistor, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the low-side transistor is sensed by ...


5
Kenji Tomiyoshi, Rei Hashimoto: H-bridge buck-boost converter. Analog Devices, Kenyon & Kenyon, May 31, 2011: US07952900 (17 worldwide citation)

An H-bridge buck-boost converter includes a first half-bridge portion having at least one first transistor, an inductor portion connected to the first half-bridge portion at a first connection, a second half-bride portion connected to the inductor portion at a second connection, the second half-brid ...


6
Kenji Tomiyoshi: Apparatus and method for step-down switching voltage regulation. National Semiconductor Corporation, Darby & Darby PC, Matthew M Gaffney, May 13, 2008: US07372238 (16 worldwide citation)

A current mode PWM buck regulator is provided. The regulator includes a top-side transistor, a bottom-side transistor, an inductor, a sample-and-hold circuit, a ramp generator, a PWM comparator, an error amplifier, and a current sense amplifier. A current through the low-side transistor is sensed by ...


7
Kenji Tomiyoshi, George A Hariman: Emulated inductor current automatic correction without knowledge of actual inductor current ramp for emulated peak control mode PWM. National Semiconductor Corporation, Darby & Darby PC, Matthew M Gaffney, November 14, 2006: US07135841 (16 worldwide citation)

Method and circuit for automatic correction of emulated inductor current without knowledge of actual inductor current ramp for an emulated current mode (ECM) PWM switching regulator. In an ECM-PWM switching regulator a compensation ramp component is usually added to an up-slope. An excess ramp compo ...


8
Kenji Tomiyoshi, Tatsuya Sawa: System and method for providing a sample and hold circuit for maintaining an output voltage of a constant current source circuit when a feedback loop is disconnected. National Semiconductor Corporation, September 29, 2009: US07595622 (15 worldwide citation)

A system and method are disclosed for maintaining an output voltage of a constant current source circuit. A constant current source circuit is provided that comprises a voltage regulator, a first feedback loop and a second feedback loop that are connected to the voltage regulator, and a sample and h ...


9
Hidehiko Suzuki, Kenji Tomiyoshi: Transient load response for a voltage regulator with a load current based control loop. National Semiconductor Corporation, Darby & Darby P C, Matthew M Gaffney, March 2, 2010: US07671575 (12 worldwide citation)

A circuit for improving transient response for a load coupled to a voltage regulator by employing both load current level information and the regulator's output voltage to control a loop that provides relatively faster and accurate regulation of the regulator's output voltage. The circuit includes a ...


10
Hirohisa Tanabe, Kenji Tomiyoshi: Inductor current emulation circuit for a switching converter. Analog Devices Global, Schwegman Lundberg & Woessner P A, June 23, 2015: US09065337 (3 worldwide citation)

An inductor current emulation circuit for use with a switching converter in which regulating the output voltage includes comparing an output which varies with the difference between the output voltage and a reference voltage with a ‘ramp’ signal which emulates the current in the output inductor. A c ...