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| 20100202169 | Protection and clamp circuit for power factor correction controller - A controller generates a drive signal for a converter circuit that includes an active component (i.e., transistor) that is selectively controlled to convert a rectified input to direct current (DC) output. The controller employs an outer feedback loop (based on monitored output voltage of the converter circuit), an inner feedback loop (based on monitored AC input current drawn by the converter circuit), and a pulse width modulator (PWM) to generate the drive signals necessary to generate the desired DC output voltage and to provide power factor correction to the converter circuit. In particular, the inner feedback loop includes an amplifier and a fault protection and clamp circuit. The amplifier has a first input connected to receive a feedback signal representing the monitored AC input current, a second input, and an output that provides a current feedback signal to the PWM. The fault protection and clamp circuit is connected to monitor the voltage at the second input of the PWM and to detect fault conditions associated with the converter circuit, wherein in response to an over-voltage condition at the second input or a detected fault condition the fault protection and claim circuit clamps the current feedback signal provided to the second input of the PWM to a reference value and provides the reference value in feedback to either the first or second input of the amplifier. | 08-12-2010 |
| 20110110132 | TIME-LIMITING MODE (TLM) FOR AN INTERLEAVED POWER FACTOR CORRECTION (PFC) CONVERTER - The present invention provides a method of controlling an interleaved power factor correction (PFC) circuit operating in a discontinuous conduction mode (DCM). The controller employs a normal mode of operation in which inductor currents in each PFC sub-circuit are estimated based on the monitored input voltage and monitored output voltage, and switching devices associated with each PFC sub-circuit are controlled to ensure DCM operation. As the input voltage increases, the OFF times of each PFC sub-circuit increase such that the inductor currents no longer overlap. In response, the controller activates a time-limiting mode (TLM) in which OFF time durations for each sub-circuit are based on the monitored sum of load currents as opposed to the monitored input voltage and monitored output voltage. | 05-12-2011 |
| 20110110133 | FREQUENCY COMPRESSION FOR AN INTERLEAVED POWER FACTOR CORRECTION (PFC) CONVERTER - A controller provides frequency compression for an interleaved power factor correction (PFC) converter that determines the ON and OFF times of each switch associated with the PFC converter to prevent operating frequencies in the audible range. The controller includes a first circuit for generating an ON time current source having a magnitude related to an amplified error signal and the monitored input voltage, and a second circuit for generating an OFF time current source having a magnitude related to the ON time current source, the monitored input voltage, and the monitored output voltage. Gate drive circuitry provides gate drives signals to the switches of the interleaved PFC converter at a frequency determined by magnitudes of the ON time current source and the OFF time current source. | 05-12-2011 |
| 20110110134 | Saving energy mode (SEM) for an interleaved power factor correction (PFC) converter - A method of controlling a power factor correction (PFC) converter having a first PFC sub-circuit and a second PFC sub-circuit determines when to transition the PFC converter between an interleaved mode and a saving energy mode (SEM). The method includes generating an amplified error signal based on a monitored output voltage of the PFC converter. The second PFC sub-circuit is disabled in response to the amplified error signal being less than a first threshold value and enabled in response to the amplified error signal exceeding a second threshold value. | 05-12-2011 |
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| 20080241630 | BLEND OF IONIC (CO)POLYMER RESINS AND MATRIX (CO) POLYMERS - The invention relates to polymeric resin blends containing polyelectrolyte resins blended into a polymer or copolymer matrix. Specifically, the polyelectrolyte resins are (co)polymers without hydrolyzable groups. The matrix polymer is a tough, and highly chemical-resistant (co)polymer, preferably a fluoropolymer. The polymeric resin blend is useful for forming films, and especially films useful for MEAs for use in fuel cells. | 10-02-2008 |
| 20090155570 | COATING COMPOSITIONS FOR INORGANIC SUBSTRATES - The invention relates to a coating composition comprising a radiation grafted functionalized fluoropolymer. This coating is preferably, in the form of a powder coating. The coating can be used on inorganic substrates, especially un-primed metals. The invention also relates to the coated inorganic substrate and to the use of the coating composition to protect the inorganic substrate, especially from corrosion. | 06-18-2009 |
| 20100197816 | HIGH TEMPERATURE STABLE POLYELECTROLYTES HAVING BACKBONE AROMATIC GROUPS - The invention relates to polyelectrolytes having backbone aromatic groups, and in particular to aromatic backbone group polyelectrolytes having high levels of sulfonation as well as cross-linking functionality. Preferably the polyelectrolyte back-bone is free of linear alkyl groups. | 08-05-2010 |
| 20110250435 | NANO-STRUCTURE COATED SHEETS/FILMS FOR OPTICAL ELECTRONIC DISPLAYS AND PHOTOVOLTAIC MODULES - The invention relates to a thin, nano-structured coating that provides optical light efficiency enhancement. The dried coating contains nano-structures that provide a very low haze level of less than 2 percent, and a light transmission improvement of at least 1% over the non-coated substrate. For the nano-structured coating on an acrylic substrate the transmission is greater than 93 percent, and preferably greater than 94 percent. The coatings of the invention are especially useful for optical electronic displays and photovoltaic modules. | 10-13-2011 |
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| 20080242498 | HYBRID VEHICLE INTEGRATED TRANSMISSION SYSTEM - A transmission for an alternatively powered vehicle includes an accessory unit selectively powered by at least one of an engine and a motor associated with the transmission. Clutches are used to selectively engage and disengage the engine and motor with the accessory unit. | 10-02-2008 |
| 20080297136 | SYSTEM AND METHOD TO DETECT, IN A VEHICLE, BLOCKAGE OF AN AIRFLOW PASSAGE TO A POWER STORAGE UNIT - A driver of a vehicle is alerted if an air passage from an air source to a battery becomes blocked. The determination as to whether the air passage is blocked may be based on the temperature of the battery, the airflow through the air passage, and the power to a fan used to move air through the air passage. | 12-04-2008 |
| 20080312862 | METHOD AND SYSTEM FOR DETERMINING A FUEL USAGE OF A FIRST VEHICLE AND A COMPARATOR VEHICLE - A fuel usage of a comparator vehicle is calculated and compared to a fuel usage of a vehicle being driven. The fuel usage of the comparator vehicle is determined based on parameters of the vehicle being driven. | 12-18-2008 |
| 20090076696 | SYSTEM AND METHOD FOR MANAGING A POWERTRAIN IN A VEHICLE - A vehicle include a first disconnect disposed between a prime mover of the vehicle and a certain one of the vehicle drive wheels. The first disconnect is operable to connect and disconnect the prime mover to and from the certain one of the drive wheels. A second disconnect is disposed between the powertrain and the certain one of the drive wheels, and is operable to connect and disconnect the certain one of the drive wheels to and from the powertrain when the first disconnect is engaged. A control system and method are configured to control operation of at least the first and second disconnects. Through selective control of the disconnects, the system can be automatically placed in a four-wheel-drive mode based on predetermined criteria, or the desirability of the four-wheel-drive mode can be indicated to the vehicle operator in a passive version of the control system and method. | 03-19-2009 |
