Electric power conversion systems inventions 12/05

20050286269 - Constant-on-time switching power supply with virtual ripple feedback and related system and method: A signal regulator includes a switching circuit, a controller, and a threshold generator. The switching circuit generates a regulated output voltage, and the controller activates the switching circuit for a predetermined time when the regulated output signal has a predetermined relationship to a threshold voltage. The threshold generator generates the...

20050286268 - Power conversion system and method: A power conversion system comprises a converter coupled to a power source and configured to convert a DC power to a variable AC power signal. The power conversion system may further comprise a process control unit coupled to the converter and configured to control the variable AC power signal. The...

20050286270 - Full wave series resonant type dc to dc power converter with integrated magnetics: A full wave DC/DC converter magnetically integrates into the transformer assembly the functions of the resonant inductor, magnetizing inductor and the output filter inductor. The primary and the secondary windings are assembled on a gapped center leg of an E-core, while two output filter windings with an equal number of...

20050286271 - Point of load sine amplitude converters and methods: In a preferred embodiment, a Sine Amplitude Converter (“SAC”) method and apparatus for VTMs converts a DC input voltage to a DC output voltage using a fixed transformation ratio at a frequency locked to a resonance. The SAC uses a resonant circuit including a transformer and complementary primary switches operating...

20050286272 - Dc-dc converter: A DC-DC converter is structured such that a main switching element has one terminal connected to one terminal of a DC power supply and has the other terminal connected to one terminal of a first winding of a resonance coil, a choke coil has one terminal connected to one terminal...

20050286273 - Self-drive for synchronous rectifiers: A system and method for providing the self-drive of synchronous rectifiers used in isolated power converters is provided. A transformer having a primary winding, a secondary winding and a drive winding is used between a front end connected to a source and a back end coupled to a load. The...

20050286274 - Self-testing power supply apparatus, methods and computer program products: A power supply apparatus, such as an on-line UPS, includes an AC/DC converter circuit having an input configured to be coupled to an AC source, a DC/AC converter circuit having an input coupled to an output of the AC/DC converter circuit by a DC link, and a bypass circuit operative...

20050286275 - Power supply for portable printer: A power supply for a portable printer, including an apparatus generating a main driving voltage and a driving voltage for driving a portable printer using the external alternating current voltage if an external alternating current voltage is applied, and which generates a main driving voltage and a driving voltage for...

20050286276 - Inverter device: An object is to provide an inverter device by which a diode for a countermeasure against reverse connection of a direct-current power supply can be abolished, the inverter device has a constitution in which a switching unit is connected between a battery constituting the direct-current power supply and an inverter...

20050286277 - Dynamic current sharing dc-dc switching power supply: A power supply in an embodiment of the invention includes a plurality of dc-dc switching power converters, each of which has its input isolated from its output. The power converters are arranged with their respective inputs being series connected and their respective outputs being parallel connected in an embodiment of...

20050286278 - Method and apparatus for switched-mode power conversion at radio frequencies: A switched mode dc-dc converter enables increases in switching frequency over conventional architectures. In one embodiment, a dc-dc converter has a Vernier-regulated architecture having unregulated cells and a regulating cell coupled to a controller. In another embodiment, a dc-dc-converter has a cell-modulation-regulated architecture....

20050286279 - Dual mode rectifier, system and method: A system for generating an output power to a load is provided. The system comprises a generator configured for generating a variable frequency output power and a dual mode rectifier coupled to the generator and configured for being switched between a passive mode and an active mode. The dual mode...

20050286280 - Systems, multiphase power converters with droop-control circuitry and methods: Droop-control circuitry of a multiphase power converter determines when multiphase switching signals are concurrently at either a high or low state and temporarily clamps the output of the power converter to either a high or low voltage level in response thereto....

20050286281 - Method of converting a direct current voltage from a source of direct current voltage, more specifically from a photovoltaic couse of direct current voltage, into a alternating current voltage: An inverter is devised to avoid high-frequency voltages at input terminals and to allow good efficiency thanks to its simple and cost-optimized circuit layout. This is achieved by a method of converting a direct current voltage, more specifically from a photovoltaic source of direct current voltage, into an alternating current...

20050281057 - Holdover circuit for a power converter using a bi-directional switching regulator: A holdover circuit is configured with a holdover capacitor, preferably an aluminum electrolytic capacitor, to provide uninterruptible operation for an electrical load operable over a limited range of input voltage during brief power interruptions. The holdover circuit includes a switching regulator configured with two active switches that are controlled with...

20050281060 - Control of an inverter pulse-width modulator: A modulation method for a pulse width modulator in the inverter section (11) of a frequency converter provided with a voltage intermediate circuit, said frequency converter comprising a single-phase mains bridge (10) to be connected to a single-phase alternating current source (UL, N), a direct-voltage intermediate circuit and a controlled...

20050281058 - Dynamic optimization of efficiency using dead time and fet drive control: A power converter uses a control method to optimize efficiency by dynamically optimizing a controlled parameter. A change in efficiency of the converter after changing at least one controlled parameter is determined. The direction of change in efficiency of the converter is compared to a direction of the change in...

20050281059 - Switching power supply circuit: A switching power supply circuit includes a primary side series resonant circuit forming a current resonant converter, and a secondary side series resonant circuit formed by at least a secondary winding and a secondary side series resonant capacitor, whereby a coupling type resonant circuit is formed by magnetic coupling of...

20050281061 - Resonance converter with voltage regulation and method of driving variable loads: In a resonance converter for driving variable loads at first an input signal provided by a switch controlled by control means is converted to an output signal by a transformer. The transformer is dimensioned and connected such that a downward transformation ratio between input signal and output signal is between...

20050281062 - Switching mode power supply: In one embodiment, a switching mode power supply (SMPS) may comprise: a power supply for supplying power to a secondary coil of a transformer according to an operation of a main switch, the main switch being coupled to a primary coil of the transformer; a feedback circuit for generating a...

20050281063 - Phone energy management for low battery voltages: The present invention provides a power supply arrangement with a DC-to-DC converter (10) for providing at least one supply voltage to a load (20, 30, 40) from an energy source (11). The converter comprises means for inputting (4) a battery voltage from the energy source to output a voltage in...

20050281064 - Battery and inverter configuration with increased efficiency: In the current invention, in order to increase efficiency of battery powered AC electricity supply, multiple inverter/battery modules are used in parallel but can be individually shut down. The number of inverters activated depends on the power usage. When only a little power is needed only one or a few...

20050281065 - Inverter bridge controller implementing short-circuit protection scheme: A fault handling system for short circuit recovery in three-phase multiple-level inverter bridges, used to drive inductive loads, which waits for either desaturation of switches or expiration of a delay period based upon an amount of time before saturated switches are damaged before commanding off switches that are saturated, and...

20050281066 - Power converter: In motor control of electric vehicles, a snubblerless 10 KVA Matrix Converter uses discrete 65 Amp, 1200 Volt MOS Controlled Tyhristors (MCTs) to minimise commutation time and so achieve the optimum waveform quality, particularly useful when controlling induction motors in applications where the controller may demand very low output voltages....

20050281067 - System and method for unbalanced independent ac phase voltage control of a 3-phase, 4-wire output dc/ac inverter: Independent phase output voltage control for a 3-phase 4-wire DC/AC inverter, for example, is provided. With the independent phase output voltage control, all three phase output voltages from the DC/AC inverter can be separately and effectively controlled to provide balanced 3-phase voltages from the DC/AC inverter to an unbalanced load,...

20050281068 - Control of the mains bridge of a frequency converter: A method and a system for controlling the mains bridge of a four-quadrant PWM frequency converter provided with a direct-voltage intermediate circuit when power is flowing into the supply network, said mains bridge comprising a controlled mains bridge (INU) for rectification of the mains voltage to produce a DC intermediate-circuit...

20050276079 - Variable-frequency flyback converter with synchronous rectification function: Disclosed herein is a variable-frequency flyback. The flyback converter comprises a flyback transformer having secondary windings for drive and detection for providing first and second induced voltages induced from an input voltage in first and second turn ratios with a primary winding, respectively, a voltage detector for detecting the second...

20050276080 - Method of controlling the duty of a pwm signal, pwm signal generating circuit, and image forming apparatus using same: A PWM signal generating circuit that generates a PWM signal having a period controlling portion for slightly fluctuating a period of the PWM signal; and a duty controlling portion for changing a duty of the PWM signal by changing a duty ratio in the period fluctuated by the period controlling...

20050276081 - Protection circuits for a dc-to-dc converter: A DC-to-DC converter comprises a first power module, at least a second power module coupled to the first power module, and a protection circuit coupled to the first and second power modules. The protection circuit causes a system power good signal to be at a state indicative of a power...

20050276082 - Boost rectifier with half-power rated semiconductor devices: A rectifier has two half-controlled bridge rectifiers which are connected in parallel to provide DC power to DC bus lines. Each bridge rectifier receives AC power through inductances such as series inductors or an isolation transformer with a single primary and two secondaries. Each bridge rectifier has a full bridge...

20050276083 - Method for current and voltage control for a switched-mode power supply unit: The present invention relates to a method for controlling the output voltage of a primary-controlled switched-mode power supply unit having a primary-side switch and a transformer with an auxiliary winding in which an auxiliary voltage which images the output voltage is induced after the primary-side switch is opened. The voltage...

20050276084 - Current source sine wave voltage driving circuit via voltage-clamping and soft-switching techniques: In this invention, a current-source sine wave voltage driving circuit via voltage-clamping and soft-switching techniques, also known as an inverter, is applied mainly to the fuel cell, solar energy, battery and un-interruptible power systems for inverting DC voltage into utility AC voltage. A controllable current source having high frequency switching...

20050276085 - Current control for inductive weld loads: According to an example embodiment of the present invention, a circuit arrangement controls a load current to an inductive weld load in a welding application with certain compensation for the slope of the current delivery to the inductive load, such that the average load current converges quickly to the selected...

20050270804 - Soft-start circuit for power converters: A soft-start circuit for a power converter including a switch controlled to cause the soft-start interval for a converter to be terminated when a predetermined condition is fulfilled. The predetermined condition is preferably generated when the output voltage of the converter stabilizes at its normal operational level. The circuit detects...

20050270805 - Switching power supply circuit: The present invention provides a power supply circuit performing constant voltage control by switching frequency control and achieving minimization of a necessary control range of the switching frequency control and implementation of a configuration ready for a wide range. A switching power supply circuit includes a switching circuit, a switching...

20050270806 - Interleaved power converter: A power converter architecture interleaves full bridge converters to alleviate thermal management problems in high current applications, and may, for example, double the output power capability while reducing parts count and costs. For example, one phase of a three phase inverter is shared between two transformers, which provide power to...

20050270807 - Adaptive leading edge blanking circuit: The invention provides adaptive leading edge blanking circuits in which the leading edge blanking time is reduced at low to very low power levels of an SMPS, but is substantially constant at medium to high power levels. In a first embodiment of the invention, adapted leading edge blanking time is...

20050270808 - Switching mode power supply: A switching mode power supply (SMPS) is presented to compensate for variations of maximum output power caused by variations of input power. The output power varies according to variations of input power because of a propagation delay of the SMPS. To compensate for the propagation delay, a reference voltage for...

20050270809 - Device and method for converting an ac voltage: The present invention relates to a device (10) for converting an AC voltage from the mains electricity supply into a DC voltage of predetermined level (and waveform), comprising:—a rectifier circuit (16, 17, 18, 19) for connecting to the mains electricity supply;—a switching circuit connected to the rectifier circuit;—a main transformer...

20050270810 - Method and apparatus for extending the operating range of a flyforward converter: A technique for extending the operating range of a flyforward converter to low input voltages. In one aspect, power converter includes a positive input supply rail and a negative input supply rail. A power converter input voltage is to be applied between the positive and negative input supply rails. A...

20050270811 - Switching circuit and voltage measuring circuit: A switching circuit includes a capacitor, a combination battery having a plurality of unit cells connected in series, each of the unit cells containing battery, and a plurality of change-over switches sequentially connecting both ends of the each of the unit cells to the capacitor. The change-over switch has two...

20050270812 - Universal ac adapter: A method and apparatus for adaptively configuring an array of voltage transformation modules is disclosed. The aggregate voltage transformation ratio of the adaptive array is adjusted to digitally regulate the output voltage for a wide range of input voltages. An integrated adaptive array having a plurality of input cells, a...

20050270813 - Parallel current mode control: A method and apparatus to implement parallel current mode control that is suitable for digital and analog implementation. A duty cycle algorithm is composed of a voltage term and a parallel current term which depends on the inductor current change between the inductor current value at the beginning of a...

20050270815 - Full-bridge circuit: A full-bridge circuit for a heat dissipation system. The heat dissipation system further includes a fan and a control circuit. The control circuit outputs a first control signal and a second control signal. The full-bridge circuit includes a first control line having a first switch and a third switch serially...

20050270814 - Modified sinusoidal pulse width modulation for full digital power factor correction: A converter-controller includes a feedback circuit, receiving a feedback voltage from an output stage and generating a current command signal according to the difference of a reference voltage and the feedback voltage. A duty cycle modulator generates a modified duty cycle utilizing the current command signal and a reference table....

20050270816 - Combined ac-dc to dc converter: The invention relates to a combined AC-DC to DC converter. The converter provides the option of coupling to an AC supply source with at least one phase and the further option of coupling to at least one DC supply source. The converter obtains supply from at least one supply source...

20050265052 - Electronic instrument having booster circuit: Provided is an electronic instrument in which a starting voltage of a power supply is less than a starting voltage of a general booster circuit, and which is capable of starting efficiently. The electronic instrument includes: a power supply for supplying power; a first booster circuit that is started with...

20050265053 - Oscillator and semiconductor device: An oscillator for ensuring the phase relationship between two resonant circuits coupled by a coupling circuit. A first resonant circuit outputs two signals having different phases, and a second resonant circuit outputs two signals having different phases. The coupling circuit includes a plurality of inverters connected in a ring manner,...

20050265054 - Inductive output tube (iot) control circuit: A power supply for an RF transmitting tube while protecting the tube from a high voltage arc event. The supply includes a rectifier circuit configured to be connected to an AC voltage supply and having an output circuit that supplies a DC voltage to a load including the tube and...

20050265055 - Soft-switching dc/dc converter having relatively fewer elements: The proposed soft-switching DC/DC converter includes: a basic non-isolated DC/DC converter having an inductor, and an auxiliary switch module including: an auxiliary switch having a first terminal electrically connected to a first terminal of the inductor, a second terminal, and a control terminal, a resonant inductor having a first terminal...

20050265056 - Control method and circuit for synchronous rectifiers used in zvs dc/dc converter: A control method for a first synchronous rectifier and a second synchronous rectifier in a switching power converter is presented. The switching power converter includes a transformer, and a first switching device and a second switching device connected in series and in parallel with an input voltage source. The first...

20050265057 - Synchronous rectifier circuits and method for utilizing common source inductance of the synchronous fet: A method of improving the operation of a synchronous rectifier circuit which includes a switching transistor and synchronous transistor, by providing an operatively effective value of inductance in the current path of the synchronous transistor; which is shared by the control terminal circuit path of the transistor and by selecting...

20050265058 - System and method for regulating resonant inverters: A technique is provided for direct digital phase control of resonant inverters based on sensing of one or more parameters of the resonant inverter. The resonant inverter control system includes a switching circuit for applying power signals to the resonant inverter and a sensor for sensing one or more parameters...

20050265059 - Multi-use power conversion modules: A power conversion module includes a frame, first external connection terminals supported by the frame, and at least four half-bridge circuits supported by the frame and electrically coupled between selected pairs of the first external connection terminals. The module further includes respective second external connection terminals supported by the frame...