Electric power conversion systems inventions 03/08

20080068865 - Asymmetrical direct current to direct current converter using nand gate: An asymmetrical DC to DC converter using one or more NAND gates. In one embodiment, an asymmetrical DC to DC converter includes a converter unit including a switching unit and adapted to transform a first voltage having a first level to a second voltage having a second level according to... Agent: Christie, Parker & Hale, LLP

20080068867 - Integrated circuit and dc-dc converter formed by using the integrated circuit: An integrated circuit, in which the influence of parasitic capacitance between a semiconductor substrate and a resistor and between the semiconductor substrate and a capacitor can be inhibited, and a DC-DC converter provided with the integrated circuit. A shielding layer of an n-type semiconductor is formed between a p-type semiconductor... Agent: Rabin & Berdo, PC

20080068868 - Power mesfet rectifier: A rectifier MESFET includes an N-channel MESFET having its gate connected to its source, and at the same current density having a voltage drop lower than the gate Schottky diode. A Schottky diode may be connected in parallel with the N-channel device to provide over current protection. A Zener may... Agent: Advanced Analogic Technologies

20080068869 - Voltage up-and-down dc-dc convertor: A voltage up and down synchronization and rectification type DC-DC converter goes up and down an input voltage using an inductor. The voltage up and down synchronization and rectification type DC-DC converter comprises a voltage up and down use rectification circuit including a pair of PMOS and NMOS transistors connected... Agent: Dickstein Shapiro LLP

20080068871 - Power supply system and method for controlling output voltage: A power supply system including an external power supply unit generating direct-current output voltage and an electronic device connected to the external power supply unit and operable on the output voltage of the external power supply unit. The external power supply unit includes a voltage control circuit receiving control current... Agent: Arent Fox LLP

20080068866 - Current-mode controlled dc-dc conveter: A current-mode controlled DC/DC converter receives an input voltage (Vb) and supplies an output voltage (Vo). A controllable switch (S1) is coupled to an inductor (L) to obtain a periodically varying inductor current (IL) through the inductor (L). A current-mode controller (1) compares (10) the output voltage (Vo) with a... Agent: Nxp, B.v. Nxp Intellectual Property Department

20080068870 - Power unit: This invention realizes control without using a current-detecting element to prevent over current from flowing into a switching element of a switching converter in response to an input primary voltage from a small-capacity DC power source. The switching converter includes an FET 30 that turns the input primary voltage from... Agent: Westerman, Hattori, Daniels & Adrian, LLP

20080062724 - Bidirectional active power conditioner: A bidirectional active power conditioner includes a DC side, a bidirectional DC/DC power converter, a DC/AC inverter and an AC side. The DC side electrically connects with a DC source while the AC side electrically connects with a load and an AC source. The bidirectional DC/DC power converter is controlled... Agent: Kamrath & Associates P.A.

20080062725 - Multi-channels power converter having power saving means to improve light load efficiency: The present invention provides a control circuit for multi-channels power converter to save power at light load. The control circuit comprises a modulation circuit and an oscillation circuit to modulate the switching frequency of switching signals for power saving. The modulation circuit generates a modulation signal in response to the... Agent: Jianq Chyun Intellectual Property Office

20080062726 - Power adapter and power supply system using the same: The present invention is associated with a power adapter capable of simultaneously providing a low-level DC voltage and a high-level DC voltage. The power adapter includes a transformer having a primary winding for storing energy when a main switch coupled therewith is turned on and transferring the stored energy to... Agent: Madson & Austin

20080062730 - Method and apparatus for distributing electrical power: A method and apparatus for distributing electrical power is provided. In one embodiment, the apparatus includes: a semiconductor switch adapted to receive input power from a DC power source, adapted to distribute power to a DC/DC module, and adapted to receive a control signal, a charge storage device in operative... Agent: Hewlett Packard Company

20080062731 - Duty feed forward method and apparatus for modulating a duty of a pmw signal and power converting method and power converter using the same: The duty of a PWM signal in a power converter is extracted to feed forward to modulate the slope of a linear oscillating ramp signal or the voltage level of an error signal, so as to modulate the duty of the PWM signal, by which the transient response of the... Agent: Rosenberg, Klein & Lee

20080062733 - Dc-dc converter and method: A DC-DC converter and method for compensating for errors in the DC-DC converter. The DC-DC converter includes an inductor coupled for receiving a source of operating voltage through a plurality of switches. The switches are controlled by a control circuit that has first and second circuit paths that are substantially... Agent: Bradley J. Botsch Semiconductor Components Industries, LLC

20080062732 - Method of compensating output voltage distortion of half-bridge inverter and device based on the method: A method of compensating output voltage distortion of a half-bridge inverter and a device based on the method discloses that the method includes the steps of measuring the voltage of the capacitor of the half-bridge inverter and then detecting the output voltage of the same; comparing the capacitor voltage and... Agent: Bacon & Thomas, PLLC

20080062723 - Multilayer directional coupler: A multilayer directional coupler which is easy to mass-produce and reduce in size, in which fine setting of the degree of electromagnetic coupling is facilitated, and which has a large bandwidth ratio, includes magnetic substrates, a laminate including first and second transformers, and external electrodes. One external electrode, which is... Agent: Murata Manufacturing Company, Ltd. C/o Keating & Bennett, LLP

20080062727 - Laminated balun transformer: A laminated balun transformer that achieves improved balance characteristics and prevents the occurrence of parasitic inductance has an impedance transformation ratio of one to four and outputs balanced signals generated from an unbalanced signal. The laminated balun transformer includes a magnetic substrate, a laminated body, and external electrodes. The laminated... Agent: Murata Manufacturing Company, Ltd. C/o Keating & Bennett, LLP

20080062728 - Control methods for pulse width modulaton (pwm): A method of controlling a power converter is used to interface to a power grid or supply network operating at a frequency (Fnet) that is nominally fixed (say at 50 Hz, for example) but which can be varied as a way of controlling power imbalanced within the network as a... Agent: Kirschstein, Ottinger, Israel & Schiffmiller, P.C.

20080062729 - Booster that utilizes energy output from a power supply: A booster circuit generates a boosted output by boosting a low voltage output supplied as a target to be boosted and feeds back a part of the boosted output, an output by the booster circuit itself, to the booster circuit as operation energy. An auxiliary booster circuit outputs start-up energy... Agent: Oblon, Spivak, Mcclelland Maier & Neustadt, P.C.

20080055938 - Pwm method for cycloconverter: A method of using a cycloconverter switches a first switch of the first topology type to an on state after a magnitude of a current through an output inductor becomes less than a predetermined current threshold, and switches a second switch of the first topology type to an off state... Agent: General Motors Corporation Legal Staff

20080055940 - Bi-polar bi-directional energy balancing power-conversion engine: The invention provides a power converter and method for controlling same, comprising a plurality of switch elements, an inductive reactor, and at least two ports for the movement of electrical energy. Any energy-moving port may be made unipolar, bidirectional, bipolar, or bidirectionally bipolar. Ports may be equipped with sensing circuitry... Agent: Rudoler & Derosa LLC Attn: Docket Clerk

20080055939 - Electrical circuit with voltage multiplier for facilitating ignition of a gas discharge lamp: An ignition circuit and method, as may be used for igniting a gas discharge lamp, are provided. The circuit includes a voltage multiplier circuit connected to receive a signal corresponding to a DC bus voltage level from a rectifier circuit. The voltage multiplier circuit includes first and second voltage storing... Agent: General Electric Company Global Research

20080055943 - Control unit, power supply device and electronic apparatus: A power supply device has a first node to which an input voltage is input, a second node, a third node from which an output voltage is output, a first switching circuit electrically connecting the first node and the second node and a resonance circuit electrically connecting the second node... Agent: Oliff & Berridge, PLC

20080055942 - Resonance converter and synchronous rectification driving method thereof: A resonance converter and a synchronous rectification driving method thereof are provided. The resonance converter includes a switch circuit having at least two first switches, a resonance circuit having a resonance frequency, a transformer, and a full-wave rectification circuit having two second switches each of which has a drain and... Agent: Volpe And Koenig, P.C.

20080055944 - Synchronous rectifier forward converter with reverse current suppressor: Disclosed is a synchronous forward converter having a reverse current suppressor connected to the gate of a freewheel switch. The reverse current suppressor is configured to receive a control input signal generated by an internal circuitry of a power supply system where the forward converter locates, such as an enable... Agent: Madson & Austin

20080055945 - Full bridge inverter: A full bridge inverter includes a push/pull control chip outputting a first control signal and a second control signal. Each duty cycle of the two control signals is smaller than 50%. Moreover, both a first driver and a second driver are coupled to the push/pull control chip and a DC... Agent: Rosenberg, Klein & Lee

20080055946 - Dc-dc converter circuits, and methods and apparatus including such circuits: Electrical power from an input voltage supply is converted to first and second output voltages of opposite polarities using a single inductor (L) and only four principal switches (S1, S2, S4, S6). In contrast to known circuits, none of the switches is exposed to voltages greater than the input voltage... Agent: Dickstein Shapiro LLP

20080055948 - Ripple-free drive circuit for led backlights of lcd panel: A ripple-free drive circuit for LED backlights of an LCD panel includes a PFC circuit, a DC/DC converter, three output load units, and a drive voltage resetter. The PFC circuit is connected with the mains power for outputting DC power. The DC/DC converter is connected with the PFC circuit. The... Agent: Bacon & Thomas, PLLC

20080055949 - System interconnection inverter: Each time a system interconnection inverter is booted up, a control program, which is stored in a remote-controller, is downloaded and stored in a RAM in a main body side. When the system interconnection inverter is halted, the control program in the RAM is lost.... Agent: Dla Piper US LLP

20080055941 - Inverter: An inverter (1) with galvanic separation including a resonant converter (2) and an upstream mounted boost chopper (3) is intended to provide galvanic separation in the context of a variable input and output voltage as it exists in photovoltaic systems, with the efficiency being intended to be optimized over the... Agent: Pyle & Piontek Attn: Thomas R. Vigil

20080055947 - Converters for high power applications: Multilevel high power converters, referred to as hexagram converters, which preferably include a combination of six three-phase converter modules, are provided herein. The three-phase converter modules are interconnected and can be configured as any three-phase converter for any given application. One or more inductors can be used in the interconnections... Agent: Orrick, Herrington & Sutcliffe, LLPIPProsecution Department

20080055950 - Active compensation device: The present invention provides an active compensation device that is connected between a power system and a non-linear load in parallel for providing an instantaneous compensation current for the non-linear load. The active compensation device comprises an electricity-storing unit, a bridge switching unit, and a controlling unit. The bridge switching... Agent: Rosenberg, Klein & Lee

20080055951 - Power converter circuit and method for feeding a system from a dc voltage source: Circuit and method for converting a DC voltage, which is not constant over time and is preferably from a solar energy installation, into an AC voltage. The circuit arrangement has an input inductor and an H-bridge having a respective first current valve and a respective second current valve, preferably an... Agent: Cohen, Pontani, Lieberman & Pavane

20080055952 - Dc to ac power converter: A DC to AC power converter is disclosed. The power converter comprises four power-switching devices, two diodes, a step-up and isolation transformer, a capacitor-choke filter and a controller. Two power-switching devices located on the primary side of the transformer are switched to provide alternate cycles of an ac current to... Agent: Tarolli, Sundheim, Covell & Tummino L.L.P.

20080055953 - Matrix converter: A matrix converter for converting a polyphase alternating current into a desired alternating output current includes at least two stages; a plurality of controllable bidirectional switches, converts m phases of the polyphase alternating current into alternating output current with n (n<m) phases of a load; and a controllable bidirectional switch... Agent: Darby & Darby P.C.

20080055954 - Control scheme for dc/ac cycloconverter: A method includes controlling the cyclo-converter 7 in coordination with controlling a coupled HF inverter 3. The controlling of the cyclo-converter 7 provides at least a first freewheeling FW period in the cyclo-converter for each cycle of the HF inverter 3. The controlling of the HF inverter provides a freewheeling... Agent: General Motors Corporation Legal Staff

20080055955 - Control apparatus for ac-ac converter: A control apparatus for an AC-AC direct converter. The control apparatus includes a calculator providing a phase command θ* of an output voltage of the converter, a calculator providing a q-axis current iq by using output currents iu and iw and the phase command θ*, a detector detecting a pulsation... Agent: Rabin & Berdo, PC