Monolithic Power Systems, Inc.

Other

Michael Ren Hsing

James Copland Moyer

John Robert Shannon

Eric X Yang

Donald Ray Disney

Tiesheng Li

Farhood Moraveji

Ognjen Milic

Yuancheng Ren

James Nguyen

Jian Jiang

Yiqing Jin

Zheng Luo

Martin E Garnett

Anthonius Bakker

Di Han

Deming Xiao

Ken Yi

A direct AC to AC converter includes a modulation stage, a transformer and a de-modulation stage. The modulation stage is configured to convert an AC input voltage with a first frequency into a bipolar PWM voltage with a second frequency, wherein the second frequency is higher than the first frequency. The transformer has a primary winding and secondary winding, wherein the primary winding is coupled to the modulation stage to receive the bipolar PWM voltage. The de-modulation stage is coupled to the secondary winding of the transformer and configured to convert the voltage across the secondary winding of the transformer into an AC output voltage with the first frequency.

High switching frequency direct AC to AC converter

A leaning suspension system for vehicles includes suspension arms that rotate about the same pivoting point. A swing frame also rotates about the same pivoting point. The center of gravity of the vehicle remains lower than the pivoting point even when the vehicle is leaning. A wheel mount assembly is rotatably mounted to a suspension arm. A shock absorber has an end that is connected to the wheel mount assembly and another end that is connected to the suspension arm. A control unit of the vehicle includes a computer that controls actuators of the leaning suspension system based on received sensor information. The vehicle can be a tricycle or a quadracycle.

Vehicle with leaning suspension system

A computer provides a graphical user interface for displaying a virtual representation of a voltage regulator and for accepting a user requirement for the voltage regulator. The computer automatically determines an internal calibration setting of the voltage regulator that meets the user requirement. The computer simulates operation of the voltage regulator as calibrated with the internal calibration setting. The internal calibration setting is downloaded to the voltage regulator. A calibration controller of the voltage regulator receives the internal calibration setting and outputs digital calibration bits in accordance with the internal calibration setting. The digital calibration bits works in conjunction with interface circuits to adjust circuits of a voltage regulator core to digitally calibrate the voltage regulator.

Digitally calibrated voltage regulators for power management

An off-line regulator has a rectification circuit configured to rectify an AC line voltage into a rectified line voltage, a pass device coupled between the rectified line voltage and a first capacitor, and a converter. The pass device is configured to be turned ON or OFF according to a comparison signal indicating whether the rectified line voltage is over a threshold voltage. The first capacitor delivers an interim voltage into the converter which supplies power to a load. Wherein a second capacitor coupled across a driver which driving the pass device is charged by the first capacitor when the comparison signal is at a first state, and the driver is boosted when the comparison signal is at a second state.

Off-line regulator with pass device and associated method

In one embodiment, a junction field effect transistor having a substrate, wherein formed on the substrate is a graded n-doped region having a high doping concentration in an inner region and a low doping concentration in an outer region, with a p-doped buried region adjacent to the graded n-doped region near the outer region, and a spiral resistor connected to the graded n-doped region at its inner region and at its outer region. An ohmic contact at the inner region provides the drain, an ohmic contact at the outer region provides the source, and an ohmic contact at the substrate provides the gate.

High voltage junction field effect transistor with spiral field plate

A discharge circuit for an EMI filter capacitor includes normally-ON transistors. The normally-ON transistors may be controlled to limit current through them when an AC source is coupled across the discharge circuit. When the AC source is disconnected from the discharge circuit, the normally-ON transistors turn ON to allow current flow through them. The current flow allows the EMI filter capacitor to be discharged by a discharge resistor.

Low loss discharge circuits for EMI filter capacitors

RESURF effect devices with both relatively deep trenches and relatively deep implants are described herein. Also, methods of fabricating such devices are described herein. A RESURF effect device may include alternating regions of first and second conductivity types where each of the second regions includes an implant region formed into a trench region of the second region.

Super junction device with deep trench and implant

A multi-phase voltage regulator is disclosed where each phase is comprised of an array of high and low side transistors that are integrated onto a single substrate. Further, a system of mounting the voltage regulator onto a flip chip and lead frame is disclosed wherein the source and drain lines form an interdigital pattern.

Layout schemes and apparatus for multi-phase power switch-mode voltage regulator

Voltage converters with integrated low power leaker device and associated methods are disclosed herein. In one embodiment, a voltage converter includes a switch configured to convert a first electrical signal into a second electrical signal different than the first electrical signal. The voltage converter also includes a controller operatively coupled to the switch and a leaker device electrically coupled to the controller. The controller is configured to control the on and off gates of the switch, and the leaker device is configured to deliver power to the controller. The leaker device and the switch are formed on a first semiconductor substrate, and the controller is formed on second semiconductor substrate separate from the first semiconductor substrate.

Voltage converters with integrated low power leaker device and associated methods

Power devices with super junctions and associated methods of manufacturing are disclosed herein. In one embodiment, a method for forming a power device includes forming an epitaxial layer on a substrate material and forming a trench in the epitaxial layer. The trench has a first sidewall, a second sidewall, and a bottom between the first and second sidewalls. The method also includes forming an insulation material on at least one of the first and second sidewalls of the trench and diffusing a dopant into the epitaxial layer via at least one of the first and second sidewalls of the trench via the insulation material.

Power devices with super junctions and associated methods manufacturing

The described DC to AC inverter efficiently controls the amount of electrical power used to drive a cold cathode fluorescent lamp (CCFL). The output is a fairly pure sine wave which is proportional to an input control voltage. The output waveform purity is ensured by driving a symmetrical rectangular waveform into a second-order, low pass filter at the resonant frequency of the filter for all conditions of line voltage and delivered power. Operating stress on the step-up transformer is minimized by placing the load (lamp) directly across the secondary side of the transformer. When configured to regulate delivered power, the secondary side may be fully floated which practically eliminates a thermometer effect on the operation of the lamp. All of the active elements, including the power switches, may be integrated into a monolithic silicon circuit.

Method and apparatus for controlling a discharge lamp in a backlighted display

A circuit provides a voltage reference using very low power. It can also be used as a shut regulator for a quiescent current as low as 1.5 &#x3bc;A. It includes a transconductance amplifier, a gain stage, and a power transistor. One embodiment of this invention utilizes a work function difference between pgate and ngate to generate a predetermined reference voltage. In another embodiment of this invention, the predetermined reference voltage can be pre-adjusted using gate materials with different work functions.

Growing community of inventors

Saratoga, CA, United States of America

Michael Ren Hsing