67results about How to "Efficient Power Conversion" patented technology

A high efficiency photovoltaic DC-DC converter achieves solar power conversion from high voltage, highly varying photovoltaic power sources to harvest maximum power from a solar source or strings of panels for DC or AC use, perhaps for transfer to a power grid at high power levels with coordinated control possible for various elements. Photovoltaic DC-DC converters can achieve efficiencies in conversion that are extraordinarily high compared to traditional through substantially power isomorphic photovoltaic DC-DC power conversion capability that can achieve 97%, 98%, 99.2% efficiency, or even only wire transmission losses. Switchmode impedance or voltage conversion circuit embodiments may have pairs of photovoltaic power interrupt switch elements and pairs of photovoltaic power shunt switch elements to first increase voltage and then decrease voltage as part of the desired photovoltaic DC-DC power conversion.

A hybrid photovoltaic cell comprising a composite substrate of a nanotube or nanorod array of metal oxide infiltrated with a monomer precursor and subsequently polymerized in situ via UV irradiation. In an embodiment, the photovoltaic cell comprises an electron accepting TiO₂ nanotube array infiltrated with a photo-sensitive electron donating conjugated polymer. The conjugated polymer may be formed in situ through UV irradiation polymerizing a monomer precursor such as 2,5-diiodothiophene (DIT).

The invention relates to a wind/solar hybrid generation system net-connected controller and a change-over switch switching method thereof, belonging to the technical field of wind power and solar net-connected generation. The wind/solar hybrid generation system net-connected controller comprises a photovoltaic array, a wind generating set, a maximum power tracking circuit, a fan unloading circuit, a direct-current/alternating-current inverter circuit and a control circuit, wherein the control circuit comprises a singlechip microcomputer, a DSP (Digital Signal Processor), a PWM (Pulse Width Modulation) driving circuit, an SPWM (Sinusoidal Pulse Width Modulation) driving circuit and a serial port communication module; the net-connected controller also comprises a change-over switch circuit;the control circuit also comprises a latch, a digital/analog conversion chip, a data selector, an analog/digital conversion chip, a decoder and a circuit breaker driving circuit. The net-connected controller disclosed by the invention has the advantages of integrated whole structure, simpleness in operation, greatly-reduced design cost, good universality, strong anti-jamming capability of an acquisition module and considerable economic benefit and capabilities of avoiding loss of extra circuits and devices, efficiently measuring and precisely displaying data and ensuring better, efficient andhigh-quality electric quantity conversion and resource utilization of the system.

An isolated boost power converter comprises a magnetically permeable multi-legged core (102) comprising first and second outer legs (132; 136) and a center leg (134) having an air gap (138) arranged therein. A boost inductor (Lboost) is wound around the center leg (134) or the first and second outer legs (132; 136) of the magnetically permeable multi-legged core (102). The boost inductor (Lboost) is electrically coupled between an input terminal (104) of the boost converter and a transistor driver (106) to be alternatingly charged and discharged with magnetic energy. A first and second series connected secondary transformer windings (SW1; SW2) with a center-tap (116) arranged in-between are wound around the first and second outer legs (132; 136), respectively, of the magnetically permeable multi-legged core (102). In a first discharge state, the magnetic energy stored in the boost inductor (Lboost) is discharged by directing a discharge current from the boost inductor through a primary transformer winding (PW1; PW2) and in a second discharge state, the magnetic energy stored in the boost inductor (Lboost) is discharged by discharging a magnetic flux through the first and second secondary transformer windings (SW1; SW2).

An AC to DC converter system is disclosed in which a conversion circuit for converting an AC input signal to a DC output signal is operably coupled with a communication circuit designed for sensing output indicative of the presence or absence of a load at the DC output. The system is designed so that the conversion circuit operates in an inactive standby state when there is no load, and in an active state for supplying DC power when a load is present. The system is configured to operate using ultra-low power.

An efficient power driver for color light emitting diodes (LED) is disclosed for driving multiple LEDs for producing different desired colors. Such LED combinations comprising LEDs with different primary colors are suitable for implementing pixels in displaying a digitized image. This disclosed invention provides switching power conversion embodiments such that a single apparatus drives different color LEDs. Furthermore, the disclosed invention provides configurations with and without input to output isolation while enabling control of the current through each LED, for instance by an inductor or operating condition.

The present invention provides a DC/DC power converting apparatus. Three or more circuits (A1-A4), in which series-connected low-voltage and high-voltage side switches made of MOSFETs having parasitic diodes are connected across positive and negative terminals of each of smoothing capacitors (Cs1-Cs4), are connected in series. One of elementary series circuits, each including a capacitor (Cr) and an inductor (Lr), is disposed between any adjacent two of the circuits with the elementary series circuits set to have the same period of resonance. The MOSFETs of rectifier circuits (A2-A4) are brought into an ON state simultaneously with the MOSFETs of a driving inverter circuit (A1) and brought into an OFF state earlier than the MOSFETs of the driving inverter circuit (A1) by a period of time not exceeding a time period (t) equal to (period of resonance)/2. With this arrangement, a resonance phenomenon of the capacitor (Cr) and the inductor (Lr) is used and conduction loss in the rectifier circuits (A2-A4) is reduced in DC/DC power conversion performed through charging and discharging operation of the capacitor (Cr).

A driver assistance system (12) comprises an optical detector (14) with active scene illumination. The optical detector includes at least one of a stereoscopic imager, a time-of-flight imager, a structured-light imager and a night vision system. The optical detector includes a light source (16) for converting electrical energy into light, projection optics (18) for illuminating a scene with light generated by the light source and one or more optical sensors (20) for detecting light returned from the scene in response to the scene being illuminated. The light source is thermally connected to a heat sink (30) for evacuating heat produced by the light source and the projection optics are optically connected to the light source with one or more optical fibers (22) for transport of light generated by the light source to the projection optics.

A power conversion apparatus includes a primary side circuit and a secondary side circuit magnetically coupled to the primary side circuit via a transformer, and converts power between a primary side port of the primary side circuit and a secondary side port of the secondary side circuit, using switching of each of the primary side circuit and the secondary side circuit. The power conversion apparatus further includes a control unit that controls a frequency of the switching and a phase difference between the switching of the primary side circuit and the switching of the secondary side circuit such that power conversion efficiency between the primary side port and the secondary side port is increased.

The present invention relates to a novel polymeric material for a highly efficient organic thin-film solar cell with high hole mobility and power conversion efficiency. In the polymeric material, a compound containing an electron donating group represented by Formula 1 or 2 and a compound containing an electron accepting group represented by one of Formulae 3 to 8 are repeatedly introduced in an alternating manner.

An uninterruptible power supply having efficiency power conversion has an AC to DC power conversion circuit, a battery power conversion circuit and a control circuit. The AC to DC power conversion circuit is parallelly connected to the battery power conversion circuit to convert the AC power of an AC mains into a DC power and supply the DC power to a load. When the AC mains stably supplies power, the control circuit controls to activate the AC to DC power conversion circuit and supply power to the load through the AC to DC power conversion circuit only. As there is only one power conversion between the AC mains and the load, the power conversion efficiency can be enhanced.

A power converter for eliminating ripples comprises a first voltage converter for outputting a first voltage by means of a step-up or step-down of the DC voltage received from a battery or a solar cell; a second voltage converter, to which the first voltage outputted from the first voltage converter is inputted, for outputting a second voltage by means of a step-up or step-down of the first voltage; a ripple-eliminating capacitor positioned between the first voltage converter and the second voltage converter, for transmitting just a DC component of the first voltage by eliminating an AC component included in the first voltage.

The invention provides an improved dual-auxiliary resonant pole-type three-phase soft switch inversion circuit, and relates to the technical field of power electronics. The circuit comprises three phase main inversion circuits and three phase dual-auxiliary resonant conversion circuits, wherein each phase main inversion circuit comprises two main switch tubes and two main diodes, and each phase dual-auxiliary resonant conversion circuit comprises four auxiliary switch tubes, two main resonant capacitors, four auxiliary resonant capacitors, two auxiliary resonant inductors and six auxiliary diodes. With the improved dual-auxiliary resonant pole-type three-phase soft switch inversion circuit provided by the invention, the simplification of the dual-auxiliary resonant conversion current and the decoupling of the resonant process are completed, meanwhile, the current stress of the dual-auxiliary resonant conversion circuit is approximate to a peak load current by additionally arranging twoauxiliary resonant capacitors for limiting voltage change rate, so that the conduction loss of the dual-auxiliary resonant conversion circuit can be effectively reduced, and high-efficiency electricenergy conversion of an inverter within a full load range is maintained.

The present invention relates to an energy conversion device using a change of a contact surface with liquid and, more specifically, to a method and a device for converting mechanical energy into electrical energy by applying an opposite phenomenon to an electrowetting phenomenon. The energy conversion device having a simplified structure and reduced manufacturing costs with minimal malfunctions by changing a contact surface with liquid between a pair of electrodes and using the change of the contact surface with the liquid to generate electrical energy such that channel blocking can be prevented or a lubricating layer or electrodes complicatedly patterned on a channel are not required.

The present invention relates to a power supply system and method including a power generator and a storage device. Specifically, the power supply method using a power supply system which includes a power generator, a storage device, a unidirectional converter, and a bidirectional interleaved converter, and in which the other side of the unidirectional converter is connected to the other side of the bidirectional interleaved converter and power is output from the other side of the unidirectional converter, the power supply method comprises measuring one or more of an amount of power generation of the power generator and an amount of power storage of the storage device; forming a power transfer path by analyzing one or more of the amount of power generation and the amount of power storage; and controlling activation of devices on the formed power transfer path.