Wiggenhorn
John Wiggenhorn, Cary, NC US
Patent application number | Description | Published |
---|---|---|
20150103567 | ISOLATED SWITCHING CONVERTER WITH SECONDARY SIDE MODULATION AND CONTROL METHOD - A controller of an isolated switching converter includes an error amplifying circuit, a modulation signal generator, a first comparison circuit, a primary off detection circuit, a secondary logic circuit, an isolation circuit and a primary logic circuit. The error amplifying circuit generates a compensation signal based on the difference between a reference signal and a feedback signal. The first comparison circuit compares the compensation signal with a modulation signal generated by the modulation signal generator and generates a first comparison signal. The primary off detection circuit detects whether the primary switch is off and generates a primary off detection signal. The secondary logic circuit generates a secondary control signal to control the secondary switch based on the first comparison signal and the primary off detection signal. The isolation circuit receives the first comparison signal and generates a synchronous signal electrically isolated from the first comparison signal. The primary logic circuit generates a primary control signal to control the primary switch based on the synchronous signal. | 04-16-2015 |
John R. Wiggenhorn, Cary, NC US
Patent application number | Description | Published |
---|---|---|
20090016082 | Systems and Methods for Frequency Control of a Voltage Converter - Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer, an operational detector, and a controllable oscillator. The transformer includes a first winding and a second winding, and the operational detector provides an electrical output corresponding to an operational characteristic of the transformer. The controllable oscillator provides a clock output with a frequency corresponding to the electrical output. This clock output at least in part controls application of a voltage input to the first winding. | 01-15-2009 |
20090021962 | Systems and Methods for Off-Time Control in a Voltage Converter - Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer with a first winding and a second winding. A voltage is applied to the first winding for a period that is followed by an OFF time. The voltage converter further includes an OFF time controller that is operable to adjust the OFF time based at least in part on a load current traversing the second winding. | 01-22-2009 |
20120039093 | SYSTEMS AND METHODS FOR OFF-TIME CONTROL IN A VOLTAGE CONVERTER - Various embodiments of the present invention provide voltage converters and methods for using such. As one example, a voltage converter is disclosed that includes a transformer with a first winding and a second winding. A voltage is applied to the first winding for a period that is followed by an OFF time. The voltage converter further includes an OFF time controller that is operable to adjust the OFF time based at least in part on a load current traversing the second winding. | 02-16-2012 |
Michael Wiggenhorn, Munchen DE
Patent application number | Description | Published |
---|---|---|
20090155346 | PREPARATION OF POWDERS CONTAINING COLLOIDAL PARTICLES - The invention discloses a method for preparing a powder from an aqueous liquid which comprises colloidal particles. The method is based on the use of dense-phase extraction media, i.e. near-critical or supercritical fluids. The powder obtained through the method can be reconstituted with an appropriate aqueous liquid to yield a colloidal dispersion. The method is particularly useful for drying and stabilising aqueous colloidal dispersions comprising an active compound, such as a drug substance. | 06-18-2009 |
20100297214 | PERCOLATIVE DRYING FOR THE PREPARATION OF PARTICLES - The present invention relates to dry particles and methods of preparing the same, in particular to methods of producing dry particles comprising a thermally labile component such as a colloidal system or a thermally labile biopharmaceutical compound, to the use of such dry particles, and to pharmaceutical compositions comprising the same. | 11-25-2010 |
20100316696 | LIPOSOME PREPARATION BY SINGLE-PASS PROCESS - The present invention relates to a method of preparing liposomes in a single-pass mode. The method comprises the extusion of a solution or suspension through a porous device and subsequently passing said suspension or solution through a nozzle. Passing the suspension through said nozzle may result in an atomisation of the suspension or solution into droplets which might be employed in a subsequent spray-drying or spray-freezing process. | 12-16-2010 |
Michael Wiggenhorn, Munich DE
Patent application number | Description | Published |
---|---|---|
20110247234 | DRYER WITH MONITORING DEVICE - The invention provides a monitoring device ( | 10-13-2011 |
20150101208 | DRYER WITH MONITORING DEVICE - The invention provides a monitoring device ( | 04-16-2015 |