Oce-technologies B.v.

Abb B.v.

Kumiai Chemical Industry Co., Ltd.

National Institute of Agrobiological Sciences

Power Research Electronics B.v.

Led Driven Holding B.v.

Mark Gröninger

Menno Kardolus

Dolf Van Casteren

Hans Reinten

Pieter Gijsbertus Maria Kruijt

Johannes Mathieu Marie Simons

Ronald Herman Schippers

Jos Schijffelen

Marcus J Van Den Berg

Hermanus M A Wijshoff

A resonant power converter includes a resonance tank formed by a capacitance component and an inductance component, at least two switches connected to the resonance tank and a voltages source in a bridge configuration, a number of snubber capacitors connected in parallel to each of the switches, a controller configured to control ON and OFF timings of the at least two switches so as to excite the resonance tank, and a voltage sensor configured to sense a voltage drop across at least one of the switches. The controller is configured to switch the at least one of the switches to the ON state when the absolute value of the sensed voltage drop reaches a minimum.

Resonant power converter

A battery charger for electric vehicles includes at least three identical current controlled AC-DC converter modules having reverse current protected outputs connected in parallel to a charge terminal of the battery.

Battery charger for electric vehicles

An LED driver circuit includes at least one string () of LEDs () connected in series, and a power supply for converting a mains voltage (AC) into an output voltage (U) to be applied to the at least one string () of LEDs, in which the power supply includes a single-stage boost converter () adapted to directly convert the mains voltage (AC) into the output voltage (U).

LED driver circuit

A power supply circuit includes a number N, N&#x2267;2, of parallel connected, cyclically switched electronic converters having outputs connected to a common output terminal; and a controller providing switching pulse signals switching the converters with a switching frequency that is the same for all converters; load circuits connected to the output terminal; a PLC transmitter modulating an output current from the output terminal; and a PLC receiver in each load circuit, the controller switching the converters with interleaved switching pulse signals; the PLC transmitter modulating the output current by switching the controller between at least two modes of operation that differ in phase relations and/or pulse shapes of the switching pulse signals, changing a ripple frequency spectrum of the output current such that a suppression amount of a predetermined frequency component is changed depending upon the mode of operation; and the PLC receiver detects the predetermined frequency component.

Power line communication system

An inkjet system including a printhead with an ink-fillable chamber operatively connected to a piezoelectric actuator and provided with a nozzle for the ejection of ink drops in response to the energization of the actuator, which actuator is connected to a measuring circuit for measuring an electrical signal generated by the actuator in response to the deformation thereof, wherein the system is configured such that a natural frequency of said system corresponds substantially to a natural frequency of a disturbance in the system.

Inkjet system, method of making this system, and use of said system

A method of controlling an inkjet printhead containing a substantially closed duct in which ink is situated, said duct having at least one exit opening for the ink, wherein an actuation pulse is applied to an electro-mechanical transducer so that the pressure in the duct changes in such a manner than an ink drop is ejected from the exit opening, wherein the method further comprises: measuring the electric impedance of the electromechanical transducer and adapting the actuation pulse on the basis of the measured impedance.

Method of controlling an inkjet printhead, an inkjet printhead suitable for use of said method, and an inkjet printer comprising said printhead

A method of controlling an inkjet printhead with a substantially closed duct in which ink is disposed, which duct has an exit opening for the ink, the method including the actuation of an electromechanical transducer so that the pressure the duct changes in such a manner that an ink drop is ejected from the exit opening, said pressure causing a deformation of the transducer, whereby after the end of the actuation, an electric signal generated by the transducer is measured as a result of the deformation, wherein a subsequent actuation of the transducer is adapted to the measured signal.

Inkjet printhead, a method of controlling an inkjet printhead, and an inkjet printer provided with such a printhead

A method of controlling an inkjet printer containing at least two substantially closed ducts in which ink is present, which includes actuating an electro-mechanical transducer whereby the pressure in a first duct is increased, and a pressure change in another duct is also generated by said actuation, whereby an electro-mechanical transducer is deformed as a result of the pressure change, said electrical transducer generating an electrical signal, and measuring the electric signal.

Growing community of inventors

Venlo, Netherlands

Mark Gröninger