Murata Manufacturing Co., Ltd.

Zhihua Yang

Jahangir Afsharian

Bing Gong

Dewei Xu

Tao Zhao

Yan-Fei Liu

Yang Chen

Hongliang Wang

Takashi Hara

Kamaljit Thandi

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 start-up circuit for a resonant converter is arranged such that, during start-up of the resonant converter, the start-up circuit provides a drive signal that is to be applied to a switching transistor of the resonant converter and that has a variable duty cycle and a variable frequency. A converter includes a voltage source, a capacitor connected to the voltage source, a first switching transistor connected to the voltage source, a transformer connected to the capacitor, and a start-up circuit arranged to drive the first switching transistor with the drive signal during start-up of the converter. A start-up method for a resonant converter including a first switching transistor includes driving the first switching transistor with a variable duty cycle and a variable frequency.

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Markham, Canada

Zhihua Yang