Murata Manufacturing Co., Ltd.

Bing Gong

Jahangir Afsharian

Zhihua Yang

Dewei Xu

Yan-Fei Liu

Yang Chen

Hongliang Wang

Tao Zhao

Rubinic Jaksa

Hussain S Athab

Anil Yaramasu

A power factor correction converter that outputs a DC output voltage from an AC input voltage, includes two channels each including a high-side switch and a low-side switch connected in cascade between a positive output terminal and a negative output terminal of the power factor correction converter and with a node between the high-side switch and the low-side switch; an inductor connected to a first terminal of the AC input voltage and the first node; a gate driver connected to the second high-side switch and the second low-side switch; a bootstrap circuit connected to the second node and the gate driver; wherein the second node is connected to a second terminal of the AC input voltage; and the bootstrap circuit is pre-charged at beginnings of negative half-cycles of the AC input voltage.

Bootstrap pre-charge circuit in totem-pole power factor correction converter

A power supply circuit includes at least two input terminals that receive an input voltage, a transformer including a primary side electrically connected to the input voltage, a rectifier electrically connected to a secondary side of the transformer, and a boost switch electrically connected in parallel with the rectifier and a pair of output voltage terminals that include a first output voltage terminal and a second output voltage terminal. The input voltage is electrically connected to an AC source, and each of the at least two input terminals receives a different phase of the AC source.

Buck matrix-type rectifier with boost switch, and operation thereof during one-phase loss

A power supply circuit includes a matrix converter that converts a first to third input alternating current (AC) phases into a single primary phase, a transformer including a primary side electrically connected to the single primary phase, a rectifier electrically connected to a secondary side of the transformer, and an output voltage terminal electrically connected to the rectifier. The matrix converter includes first through sixth bi-directional switch pairs, and each of the first through sixth bi-directional switch pairs includes first and second uni-directional switches. When the third input AC phase is disconnected or short circuited, the second and the fifth bi-directional switch pairs are turned off, and, in each of the first, third, fourth, and sixth bi-directional switch pairs, one of the first and second uni-directional switches are turned on and the other of the second and first uni-directional switches are operated as a full-bridge phase-shifted converter.

Apparatus and method of operating matrix converter-based rectifier when one phase is disconnected or is short-circuited

A converter includes input voltage terminals, a series circuit connected to the input voltage terminals and including first and second switches connected in series, a transformer including a primary winding and a secondary winding, a resonant tank connected to the series circuit and including the primary winding, an auxiliary switch connected to the series circuit and the resonant tank, output voltage terminals connected to the secondary winding, and a controller that, based on a single control loop and a single control parameter, controls the auxiliary switch with pulse-width modulation and controls the first and second switches with pulse-frequency modulation.

Simplified hybrid PWM/PFM control method for SLLC converter

A converter with soft start includes a transformer; first and second switches connected to the transformer to supply power to the transformer; a controller connected to the first and second transistors and arranged to, during startup of the converter, switch the first switch with a variable duty cycle and switch the second switch with either a fixed duty cycle or a variable duty cycle with pulses larger than pulses of the variable duty cycle of the first switch; and a bleed device arranged to set initial conditions of the converter before startup of the converter by discharging a capacitor in the converter before startup.

Inrush current control during starting of resonant converters

An LLC converter includes a transformer that includes a primary winding and a secondary winding, a resonant stage that includes the primary winding, a switching stage that includes switches and that is connected to an input voltage and the resonant stage, a rectifying stage that is connected to the secondary winding and that provides an output voltage, and a controller that senses the output voltage and that controls switching of the switches based on proportional-integral control of the output voltage to reduce errors in the output voltage with respect to a DC voltage and based on quasi-resonant control of the output voltage to reduce errors in the output voltage with respect to a range of voltages with a frequency bandwidth.

120-Hz ripple reduction with PIR controller for LLC converter

A transformer assembly includes a transformer with primary windings located on multiple layers and with secondary windings interleaved with the multiple layers and includes a substrate connected to the transformer and with a first transistor with first, second, and third terminals, in which the first terminal is connected to the secondary windings, the second terminal is connected to an output terminal of the transformer assembly, and the third terminal is a control terminal; first conductive layers; second conductive layers interleaved with the first conductive layers; a first via that is solid filled and that connects the first conductive layers and the first terminal; and a second via that is solid filled and that connects the second conductive layers and the second terminal.

High-frequency transformer design for DC/DC resonant converters

A converter includes a half-bridge circuit including first and second transistors that are connected in series, the half-bridge circuit is connected in parallel with a voltage input and includes a node connected to both the first and second transistors; a resonant inductor connected to the half-bridge circuit and the primary winding of a transformer; a resonant capacitor connected to the half-bridge circuit and the primary winding; a third transistor with a first terminal connected to the half-bridge circuit and a second terminal directly connected to a first terminal of the resonant inductor; and a rectification stage that is connected to the secondary winding of the transformer and that includes first and second synchronous rectifiers. The rectification stage does not use discrete diodes to provide rectification, and during voltage boost operation, the third transistor is turned on and off to maintain an output voltage level.

Converters with hold-up operation

An LLC resonant converter includes a first phase with a first primary circuit and a second phase with a second primary circuit. The first primary circuit includes a first shared inductor, and the second primary circuit includes a second shared inductor. The first and second shared inductors are connected in parallel with each other. The first and second primary circuits do not include a capacitor that is connected in parallel with each other.

Modular parallel technique for resonant converter

A method of commutation in a matrix rectifier from an active vector to a zero vector includes two steps. A method of commutation in a matrix rectifier from a zero vector to an active vector includes three steps.

Apparatus and method of fast commutation for matrix converter-based rectifier

A matrix rectifier includes a bridge x defined by phases A and B and a bridge y defined by phases A and C, in which each input phases A, B, and C includes two bi-directional switches connected in series. A method of operating the matrix rectifier includes operating the bridges x and y as independent full-bridge phase-shifted converters in each 60&#xb0; interval between two successive zero-voltage crossings of the input phases A, B, and C. In a first 30&#xb0; sector of each 60&#xb0; interval, the bridges x and y are operated in a first vector sequence in every switching period, and the first vector sequence is divided into a sequence of,,,,,.

PWM scheme based on space vector modulation for three-phase rectifier converters

A converter includes a transformer including primary windings and secondary windings, switches connected to the primary windings, an output inductor connected to the secondary windings, and a controller connected to the switches. The controller turns the switches on and off based on dwell times calculated using space vector modulation with a reference currentwhose magnitude changes with time.

Space vector modulation for matrix converter and current source converter

A current control circuit includes a current transformer that detects a primary current, a sensor gain switch that selectively connects the primary current to one of a first gain amplifier and a second gain amplifier to provide a current sensing output, a controller gain switch that selectively connects the current sensing output to one of a first controller amplifier and a second controller amplifier, and a controller that controls switching of the sensor gain switch and the controller gain switch.

Growing community of inventors

Markham, Canada

Bing Gong