Abstract: A hybrid light tower includes an engine, a generator configured to be driven by the engine, a battery pack, a mast, and a light assembly including a plurality of light emitting diodes. The generator is configured to produce a first DC power. The battery pack is directly electrically coupled to the generator to receive the first DC power from the generator to charge the battery pack. The light assembly is coupled to the mast and the light emitting diodes electrically coupled to the battery pack to receive a second DC power from the battery pack.

Abstract: A light tower includes a base, an extendible mast coupled to the base, a battery pack supported on the base and including a plurality of lithium-ion battery cells, a light assembly including a plurality of light emitting diodes electrically coupled to the battery pack, a display configured to receive inputs and display information, and a controller in communication with the battery pack, the light assembly, and the display. The configured being to: receive a light intensity change input from the display, change a power provided by the battery pack to the light emitting diodes in response to the light intensity change input, and display on the display a change in runtime resulting from the change of the power provided by the battery pack to the light emitting diodes.

Abstract: A hybrid light tower includes an engine, a permanent magnet generator configured to be driven by the engine, a battery pack including a plurality of lithium-ion battery cells, an extendible mast configured to move between a lowered position and a raised position, and a light assembly including a plurality of light emitting diodes. The generator is configured to produce a first DC power. The battery pack is directly electrically coupled to the generator to receive the first DC power from the generator to charge the battery pack. The light assembly is coupled to the mast and the light emitting diodes electrically coupled to the battery pack to receive a second DC power from the battery pack. The light tower does not include a battery charger connected to the battery pack.

Abstract: A light tower includes a base, an extendible mast coupled to the base, a battery pack supported on the base and including a plurality of lithium-ion battery cells, a light assembly including a plurality of light emitting diodes electrically coupled to the battery pack, a display configured to receive inputs and display information, and a controller in communication with the battery pack, the light assembly, and the display. The configured being to: receive a light intensity change input from the display, change a power provided by the battery pack to the light emitting diodes in response to the light intensity change input, and display on the display a change in runtime resulting from the change of the power provided by the battery pack to the light emitting diodes.

Abstract: A hybrid light tower includes an engine, a permanent magnet generator configured to be driven by the engine, a battery pack including a plurality of lithium-ion battery cells, an extendible mast configured to move between a lowered position and a raised position, and a light assembly including a plurality of light emitting diodes. The generator is configured to produce a first DC power. The battery pack is directly electrically coupled to the generator to receive the first DC power from the generator to charge the battery pack. The light assembly is coupled to the mast and the light emitting diodes electrically coupled to the battery pack to receive a second DC power from the battery pack. The light tower does not include a battery charger connected to the battery pack.

Abstract: A peak-buck peak-boost current mode control structure and scheme for a synchronous four-switch and non-synchronous two-switch buck-boost regulators sense input and output voltages to smoothly transition between buck mode, buck-boost mode, and boost mode for high power efficiency and low output ripples. With the inductor current sensing, the control scheme achieves the best performance in continuous conduction and discontinuous condition mode operations.

Abstract: A peak-buck peak-boost current mode control structure and scheme for a synchronous four-switch and non-synchronous two-switch buck-boost regulators sense input and output voltages to smoothly transition between buck mode, buck-boost mode, and boost mode for high power efficiency and low output ripples. With the inductor current sensing, the control scheme achieves the best performance in continuous conduction and discontinuous condition mode operations.

Abstract: In some boost converter applications, an input voltage normally exceeds a regulated output voltage. The operation of the boost converter in this condition can be referred to as a pass-through operation. Using various techniques, the efficiency of a pass-through operation of a synchronous boost regulator circuit can be greatly improved. For example, a synchronous boost regulator circuit can include an input voltage VIN to output voltage VOUT voltage comparator that can accurately monitor the output voltage to detect the pass-through operation. In a pass-through operation, the high-side switch can be kept ON to maintain high efficiency, and the quiescent current of the regulator circuit can be minimized by setting portions of the control circuit into a sleep mode.

Abstract: A peak-buck peak-boost current mode control structure and scheme for a synchronous four-switch and non-synchronous two-switch buck-boost regulators sense input and output voltages to smoothly transition between buck mode, buck-boost mode, and boost mode for high power efficiency and low output ripples. With the inductor current sensing, the control scheme achieves the best performance in continuous conduction and discontinuous condition mode operations.

Abstract: System and method for a light emitting diode (LED) driver are disclosed. To supply an LED bus voltage to a large array of LEDs organized in multiple channels where one or more LEDs are connected in series in each channel, an LED driver includes a power converter, a feedback generation circuit, and a phase-division based controller. The power converter is configured for providing the LED bus voltage to the multiple LED channels based on a voltage control signal. The feedback generation circuit is configured for generating a feedback signal based on the LED bus voltage supplied to the multiple LED channels. The phase-division based controller is configured for generating the voltage control signal based on the feedback signal and information from the multiple LED channels.

Abstract: System and method for a light emitting diode (LED) driver are disclosed. To supply an LED bus voltage to a large array of LEDs organized in multiple channels where one or more LEDs are connected in series in each channel, an LED driver includes a power converter, a feedback generation circuit, and a phase-division based controller. The power converter is configured for providing the LED bus voltage to the multiple LED channels based on a voltage control signal. The feedback generation circuit is configured for generating a feedback signal based on the LED bus voltage supplied to the multiple LED channels. The phase-division based controller is configured for generating the voltage control signal based on the feedback signal and information from the multiple LED channels.

Abstract: Circuitry arranged for sensing a variable polarity signal comprises an input node supplied with the variable polarity signal to produce an input signal. A first sensing circuit is responsive to the input signal having a first polarity for producing a first signal. A level shifting circuit is responsive to the input signal having a second polarity for shifting a level of the input signal to produce a shifted signal of the first polarity at a level determined by the input signal.

Abstract: A data processing system comprises a document server (5), a messaging server (4) and a client (1). The client communicates over a network (7, 10) with the document server to request a copy of a document stored on the document server. The document server is configured so that in response to such request a client copy of the document is downloaded to the client from the document server. The client (1) is configured so that a client application (13) running on the client communicates with the messaging server (4) and registers information with a messaging server application (14), the information identifying the client and the document that has been downloaded. The document server (5) is further configured so that when the document that has been downloaded is updated on the document server, a document server application (15) communicates with the messaging server (4) and provides instructions to be carried out by the client application.

Abstract: The present invention provides a support device associated with an object such as a vehicle tailgate or a residential deck for holding an umbrella with an umbrella pole supporting at least one serving tray to provide shade from the sun for a user occupying a portion of the object. The support device comprises a bent plate support in contact with the object. At least one retainer strap with a hook at each end holds the bent plate in contact with the object. An umbrella pole support is connected to the bent plate support to receive and help hold the umbrella pole. At least one support collar is welded to the bent plate to receive and support the umbrella pole support. Additional accessories and applications are also realized within the scope of this invention including a fishing pole holder, a bowl holder and a light assembly for night use.

Abstract: A meter stand is provided for holding a meter such as a multi-meter. In general, the meter stand includes an arm assembly detachably connected to a base member. The arm assembly includes a meter attachment assembly for holding the meter, a first arm attached to the meter attachment assembly, and a second arm hingedly connected to the first arm. The second arm also includes a socket attachment that detachably connects the arm assembly to the base member. In one embodiment, the base member is a magnetic base member. In another embodiment, the base member includes a clamp assembly. In yet another embodiment, the base member includes a stand assembly. The stand assembly can be used to support the meter stand on a substantially flat surface or a vertical surface or used in combination with a neck strap to support the meter stand around a user's neck.