Monolithic Power Systems, Inc.

Di Han

Jian Jiang

Eric X Yang

Naixing Kuang

Hunt Hang Jiang

Michael Ren Hsing

Zhijun Ye

Panyin Liu

A control circuit for controlling a multi-level buck converter having N pairs of switches serially connected between an input terminal and a logic ground, wherein N is an integer equal to or greater than 2. The control circuit has a comparing circuit, a selecting circuit and a delay circuit. The comparing circuit compares a voltage feedback signal indicative of an output voltage signal of the multi-level buck converter with a reference signal to generate a comparing signal. The selecting circuit generates N set signals based on the comparing signal. The delay circuit delays the N set signals to provide N delay set signals to control the N pairs of switches when the output voltage signal falls in of an input voltage signal of the multi-level buck converter, of the input voltage signal, . . . , or of the input voltage signal, wherein k is a proportional coefficient.

Multi-level buck converter and associate control circuit thereof

A power switch device driver with energy recovery is discussed. The power switch device adopts four switches and one inductor with appropriate control to insure the switching speed and save the power loss.

Power switch device driver with energy recovering and the method thereof

A gate driver is configured to drive a normally-on device and a normally-off device coupled in series. The gate driver controls the normally-on device in response to a PWM signal, and to control a normally-off device to maintain ON in normal operations. If an under voltage condition of a negative power supply of a first driver used to drive the normally-on device, or a positive power supply of a second driver used to drive the normally-off device, or an input supply voltage is detected, the normally-off device is controlled to be OFF.

Gate driver with improved switching performance and the driving method thereof

A 3-D package structure for isolated power module is discussed. The package structure has metal trace in a support layer (e.g. a substrate board), which is covered by two magnetic films from both sides, thus an effective transformer is formed. An IC die which contains a voltage regulator is stacked above the support layer, which significantly reduces the package size.

3-D package structure for isolated power module and the method thereof

A control method for regulating the switching frequency of a resonant converter having an input terminal to receive an input voltage and an output terminal to output an output voltage. The control method is sensing the input voltage and adjusting the switching frequency based on the comparison of the input voltage with a reference threshold voltage. When the input voltage is less than the reference threshold voltage, the switching frequency is adjusted to decrease, and when the input voltage is higher than the reference threshold voltage, the switching frequency is adjusted to increase.

Resonant converter circuit with switching frequency control based on input voltage

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

An isolated resonant converter has an analog comparator with hysteresis for generating a first ON/OFF signal, a digital isolator for outputting a second ON/OFF signal, an oscillator for providing a clock pulse signal with a frequency, and a primary pulse width modulator coupled to receive the clock pulse signal and the second ON/OFF signal. An output voltage of the isolated resonant converter is controlled by the analog comparator within a predefined range. The second ON/OFF signal is electrically isolated from the first ON/OFF signal. The primary pulse width modulator controls the switching of the isolated resonant converter in response to the clock pulse signal during the logic high state of the second ON/OFF signal and stops the switching of the isolated resonant converter during the logic low state of the second ON/OFF signal.

Isolated resonant converter with fixed output ripple

An AC/DC converting apparatus having first and second input nodes for receiving an AC input voltage Vin, a first pair of switches for coupling a first terminal of a first inductor to the first input node and ground, a second pair of switches for coupling a second terminal of the first inductor to an output node for providing a DC output voltage Vout and ground, a third pair of switches for coupling a first terminal of a second inductor to the second input node and ground, and a fourth pair of switches for coupling a second terminal of the second inductor to the output node and ground. The first pair of switches is turned ON when Vin is in a first portion having a first polarity, the third pair of switches is turned ON when Vin is in a second portion having a second polarity.

Growing community of inventors

San Jose, CA, United States of America

Di Han