Patents Assigned to Active-Semi (BVI), Inc.
  • Patent number: 10917015
    Abstract: A multiphase operation control method comprises configuring a plurality of power phases of a power converter to operate in an interleaved manner by passing a token sequentially among the plurality of power phases, turning on a first power phase after the first power phase possesses the token and receives a trigger signal from a control circuit of the first power phase, passing the token to a second power phase after the first power phase finishes, passing the token sequentially until a last power phase of the plurality of power phases possesses the token and forwarding the token to the first power phase after the last power phase finishes.
    Type: Grant
    Filed: August 30, 2018
    Date of Patent: February 9, 2021
    Assignee: Active-Semi (BVI) Inc.
    Inventors: Narasimhan Trichy, Masashi Nogawa
  • Patent number: 10651665
    Abstract: A current sense method comprises generating a voltage across a first current mirror of a current sense apparatus, the voltage being proportional to a current flowing through the current sense apparatus when the current is greater than a predetermined current value and applying a minimum drain-to-source voltage limiter to the first current mirror of the current sense apparatus when the current is less than the predetermined current value, wherein, as a result of applying the minimum drain-to-source voltage limiter to the first current mirror, the voltage across the first current mirror is clamped to a predetermined voltage value.
    Type: Grant
    Filed: November 21, 2017
    Date of Patent: May 12, 2020
    Assignee: Active-Semi (BVI), Inc.
    Inventor: James Allen Kohout
  • Patent number: 10445281
    Abstract: An apparatus comprises a positive data input/output terminal configured to be connected with a positive data line of a USB device, wherein the positive data input/output port is weakly pulled up to a first voltage potential through a pull-up resistor, a negative data input/output terminal configured to be connected with a negative data line of the USB device, wherein the negative data input/output terminal is connected to a second voltage potential, a window comparator having an input detecting a voltage across the two data input/output terminals and a wake-up signal generator connected to an output of the window comparator, wherein the wake-up signal generator is configured to generate a signal for adjusting a switching frequency of a power converter after the USB device is connected to the power converter.
    Type: Grant
    Filed: April 20, 2016
    Date of Patent: October 15, 2019
    Assignee: Active-Semi (BVI) Inc.
    Inventor: Narasimhan Trichy
  • Patent number: 10404168
    Abstract: A power converter comprises a first switch and a second switch connected in series between an input power source and ground, an inductor connected between a common node of the first switch and the second switch, and an output capacitor and a comparator having a first input connected to a reference, a second input configured to receive a sum of a first feedback signal and a second feedback signal and an output configured to generate a turn-on signal of the first switch, wherein the first feedback signal is proportional to an voltage across the output capacitor and the second feedback signal is generated by applying at least one low-pass filter to a switching ripple voltage.
    Type: Grant
    Filed: April 10, 2018
    Date of Patent: September 3, 2019
    Assignee: Active-Semi (BVI), Inc.
    Inventors: Narasimhan Trichy, Masashi Nogawa
  • Patent number: 10291124
    Abstract: A power converter includes a first switch and a second switch connected in series between an input power source and ground, an inductor connected between a common node of the first switch and the second switch, and an output capacitor and a pulse width modulation (PWM) generator configured to generate a gate drive signal for the first switch, wherein a leading edge of the gate drive signal is determined by a comparison result between a reference and a voltage proportional to an output voltage of the power converter and a trailing edge of the gate drive signal is determined by a comparison result between a voltage ramp and a variable voltage source.
    Type: Grant
    Filed: July 2, 2018
    Date of Patent: May 14, 2019
    Assignee: Active-Semi (BVI) Inc.
    Inventors: Narasimhan Trichy, Masashi Nogawa
  • Patent number: 9859733
    Abstract: A current sense apparatus comprises a first switch having a first terminal connected to a power source and a second terminal connected to a battery, a second switch comprising a gate connected to a gate of the first switch and a first terminal connected to the first terminal of the first switch, a first operational amplifier having a first input connected to the second terminal of the first switch and a second input connected to a second terminal of the second switch, a second operational amplifier having an output connected to the gate of the first switch, a first input coupled to the first terminal of the first switch and a second input coupled to the second terminal of the first switch and a reference voltage source connected to one input of the second operational amplifier.
    Type: Grant
    Filed: September 1, 2015
    Date of Patent: January 2, 2018
    Assignee: Active-Semi (BVI), Inc.
    Inventor: James Allen Kohout