Koninklijke Philips Corporation N.v.

Marc Maria Alex Bleukx

Georg Greuel

Wolfgang Schiene

Rainer Pietig

Heinrich Von Busch

Roman Schichl

Wolfgang Rexhausen

Stefan Schwan

Christoph Leof

An optical reactor has a reactor enclosure defining a reaction chamber. In the reaction chamber, a light source operating at a very high frequency is arranged to radiate light to a fluid to be treated. A low voltage electrode is arranged to surround the light source. The light source is energized by a driving circuit which is arranged adjacent to the reactor enclosure. The driving circuit has a high voltage output terminal connected to a high voltage input terminal of the light source. The driving circuit has a low voltage output terminal which is connected to the low voltage electrode.

Optical reactor and driving circuit for optical reactor

The present invention refers to high-voltage generators, in particular to a step-down DC-to-DC converter circuit (buck converter) for supplying a DC output voltage Uwhich may e.g. be used in a voltage supplying circuitry of an X-ray radio-graphic imaging system. According to the invention, the peak value of the buck converter's storage inductor current Iis controlled by a control circuit &#x3bc;C' which regulates the on-time &#x394;tof a semiconductor switch S in the feeding line of this storage inductor L. As a result thereof, an output current sensor CS, which is commonly used in today's buck converter designs, becomes redundant.

Output current sensing method in discontinuous DC-to-DC voltage converter

A method and device for operating a device for high-voltage switching for driving capacitive loads, having a first and a second input terminal () for applying a high voltage supply, such that a higher potential of the high-voltage supply may be applied to the first input terminal () and a lower potential may be applied to the second input terminal (); a first and a second switch (S, S), connected in series between the first and the second input terminal (); a first and a second clamping diode (D, D), connected in series and in the same blocking direction between the first input terminal and the second input terminal, such that the first second clamping diode block with respect to the applied high voltage; a storage inductor Ls, which is connected with one of its terminals to a connecting point () of the both switches and with another terminal to a connecting point () of the both clamping diodes; and an output terminal () for connecting a capacitive load Cl, which output terminal is connected with the connecting point () of the both clamping diodes (D, D). The method comprises starting with both switches (S, S) open; closing of the first switch (S) after a first predetermined time; opening (ST) of the first switch (S) after a second predetermined time; closing (ST) of the second switch (S), after arriving a zero voltage over the second switch.

Method to drive a high-voltage tube grid

Transformers () for transforming primary signals into secondary signals comprise primary and secondary parts that comprise boards (--) with turns. By introducing distances larger than zero between for example any pair of neighboring boards (--), parasitic capacitances of the transformers () are reduced, and the secondary signals may comprise relatively fast/high voltage pulses having rise times &#x3e;1 kV/&#x3bc;sec. To reduce proximity effects and any resulting losses, the primary and secondary boards (--) may be stacked in interleaved ways. Such sandwich constructions reduce leakage inductances. In a particular direction, distances between subsequent primary boards (--) and distances between subsequent combinations of primary and secondary boards (--) are to be increased to further reduce capacitive losses in that particular direction. Relatively low voltage differences may be present between relatively close boards (--), and relatively high voltage differences may be present between boards (--) that are relatively far away from each other.

Planar transformer with boards

The present invention relates to an inrush current limiter device () for limiting inrushing current to a connectable load () comprising: at least one switchable IGBT-based limiter unit () for selectively limiting the inrushing current, having at least one current limiting conductor element for a limited leading of current and at least an IGBT-based switch (Q), whereby the IGBT-based switch (Q) is used as well as a controlled current limiter and as a by-pass element, and at least one control device () for controlling the IGBT-based switch (Q), whereby the control device () comprises at least one IGBT-based switch supply () and means for realizing () a smooth flank of an output signal at the selected conductor element.

Inrush current limiter device and power factor control (PFC) circuit having an improved inrush current limiter device

The present invention relates to an adaptive driver for driving a gas discharge lamp and a method for operating a gas discharge lamp driven by an adaptive driver, especially a capacitive gas discharge lamp and more especially a dielectric barrier discharge (DBD) lamp in a permanent optimized mode comprising the steps: measuring, sensing, and/or detecting a signal representing the key values of the output of the driver (current, power, voltage, frequency), calculating at least one actual reference value for the quality of the discharge of said lamp, comparing said actual reference value to at least one predefined value for an optimized operation mode of said lamp, and adjusting a power supply according to the result of said comparing.

Adaptive drive for dielectric barrier discharge (DBD) lamp

An electronic circuit topology () for driving a predominantly capacitive load () with a primary circuit with several components, a secondary circuit with a predominantly capacitive load (), and a transformer device () with a primary side (TX Ia) and a secondary side (TX Ib), connecting the primary circuit with the secondary circuit, the primary circuit components comprise: a source device (), a drain device (), and a switching device (), the transformer device () is for transforming an input voltage-current-signal to a suitable output voltage-current signal for supplying the predominantly capacitive load (), wherein the source device () is in serial connection with the transformer device (), the drain device (), and the switching device (), whereby the transformer device () comprises means for functioning as a resonant tank circuit, as a transformer device () in forward mode, and as a transformer device () in flyback mode, so that an single-ended forward-flyback circuit is achieved.

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Mechelen, Belgium

Marc Maria Alex Bleukx