ROBERTSON TRANSFORMER CO.
|ROBERTSON TRANSFORMER CO. Patent applications|
|Patent application number||Title||Published|
|20140139142||Single Phase Bridgeless Boost Converter for LED Lighting Applications - A circuit serving as a power source for light-emitting diode (LED) lighting applications, the circuit comprising a boost converter comprising a pair of boost field-effect transistors (FETs) and a boost inductor coupled to the pair of boost FETs, wherein an input voltage feeding the boost converter has a sinusoidal waveform, and wherein a half cycle of the input voltage is represented by a plurality of time slices, and a controller coupled to the boost converter and configured to determine a current time slice in the plurality of time slices, generate one or more output signals based at least in part on the current time slice and without a need to compute any multiplier function involving the input voltage, and control states of the boost FETs using the one or more output signals.||05-22-2014|
|20130120996||Thermal Transformer for LED Lighting Applications - A method of passively dissipating heat from a source of heat is described. A plurality of successive layers of thermally conductive materials is formed where each layer has a thermal conductivity less than a thermal conductivity of a preceding layer. The plurality of successive layers has a first layer, a second layer, and a third layer in stacked relationship. Thermal impedances of the plurality of successive layers from one layer to an adjacent layer in the plurality of successive layers are matched by controlling a volume of one layer relative to an adjacent layer in the plurality of successive layers.||05-16-2013|
|20130034818||Passive Thermal Impedance Matching Using Common Materials - A device and method for dissipating heat from a source of heat is described. A plurality of layers of thermally conductive materials receives a flow of heat from a source of heat. A first layer of the plurality of layers receives the flow of heat from the source of heat and redirects and transfers the flow of heat to a second of the plurality of layers. Each layer has a separate preselected thermal impedance to control a desired temperature change across the plurality of layers and to maintain a desired operating temperature of the source heat.||02-07-2013|
|20120170328||Multimodal LED Power Supply With Wide Compliance Voltage and Safety Controlled Output - A power supply for a non-linear load such as a light emitting diode load uses a voltage dynamic of a fly-back topology to correct for a rippling of an unfiltered rectified line voltage. Efficiency is optimized by utilizing a magnetic core bi-directionally. A transformer has two primaries||07-05-2012|
|20120145375||Thermal Impedance Matching Using Common Materials - A device and method for dissipating heat from a source of heat is described. A plurality of layers of thermally conductive materials receives a flow of heat from a source of heat. A first layer of the plurality of layers receives the flow of heat from the source of heat and redirects and transfers the flow of heat to a second of the plurality of layers. Each layer has a separate preselected thermal impedance to control a desired temperature change across the plurality of layers and to maintain a desired operating temperature of the source heat.||06-14-2012|
|20120056645||Analog to Digital Acquisition Eliminating Uncertainty of Level Test in High Noise Environments - A method of determining the quality of a sensed signal has capturing, comparing, categorizing, and a decision-making steps. The capturing step is used to capture a plurality of signals. A magnitude of each of the plurality of signals is compared to a predetermined value to determine a relationship between each of the plurality of signals to the predetermined value. A result of each comparison is categorized according to one of a plurality of predetermined criteria. The categorizing step is repeated at least until a predetermined number of results has been reached in at least one of the plurality of predetermined criteria. A decision is made based on which of the plurality of predetermined criteria reaches the predetermined number.||03-08-2012|
|20110279052||VARIABLE LOAD LINE GAS CURVE INTERCEPT METHOD TO OPTIMIZE SYSTEM EFFICIENCY - The operation of gas discharge devices involves stabilizing drive stage with a highly dynamic load exhibiting both negative resistance and non-linear behavior. Stabilization is typically accomplished by inserting impedance in series with the plasma load so the combination impedance has a voltage division that is characterized by the intersection of the linear series impedance and the instantaneous voltage-current. This is stable as long as there is an ample excess of voltage driving the plasma/series impedance complex. However providing series impedance that insures stable operation over varying power levels, lamp types/chemistries and changes resulting from aging can lead to inefficient operation as a result of either high voltage/power drops in the series impedance or a high source voltage driving smaller impedance. A method to optimize the series impedance and driving voltage through a dynamic adjustment process of both the voltage and impedance parameters to provide stable gas plasma drive and maximize system efficiency is described.||11-17-2011|
|20110279037||METHOD AND APPARATUS FOR USING THERMIONIC DEVICES TO RECOVER ENERGY FROM LIGHT SOURCES AND OTHER ENERGY CONVERSION DEVICES - A lamp having a light emitting diode, a pettier device, a heat sink, a translucent thermally conductive window, and an optical fluid. The pettier device is in thermal communication with the light emitting diode and converts a waste thermal energy discharged by the light emitting diode into an electrical energy. Conductors transfer the electrical energy from the pettier device to a boost circuit which converts a level of a voltage associated with the electrical energy output from the pettier device to a higher, more useful value. The heat sink transfers a second thermal energy from the pettier device. The optical fluid is located between the translucent thermally conductive window and the light emitting diode. The optical fluid has an angle of diffraction having an intermediate value relative to an angle of diffraction associated with the light emitting diode and an angle of diffraction associated with the translucent thermally conductive window.||11-17-2011|
|20100147089||FORCE/ENERGY RE-VECTORING DEVICE - Apparatus (||06-17-2010|
Patent applications by ROBERTSON TRANSFORMER CO.