WO2013185025A1 - Systèmes de gestion d'une injection de courant continu - Google Patents

Systèmes de gestion d'une injection de courant continu Download PDF

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Publication number
WO2013185025A1
WO2013185025A1 PCT/US2013/044695 US2013044695W WO2013185025A1 WO 2013185025 A1 WO2013185025 A1 WO 2013185025A1 US 2013044695 W US2013044695 W US 2013044695W WO 2013185025 A1 WO2013185025 A1 WO 2013185025A1
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WO
WIPO (PCT)
Prior art keywords
inverter
component
magnitude
polarity
source
Prior art date
Application number
PCT/US2013/044695
Other languages
English (en)
Inventor
Hussam Alatrash
Original Assignee
Petra Solar, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Petra Solar, Inc. filed Critical Petra Solar, Inc.
Publication of WO2013185025A1 publication Critical patent/WO2013185025A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H02J3/381—Dispersed generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output
    • H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
    • H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
    • H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
    • H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
    • H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
    • H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
    • H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
    • H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
    • H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
    • H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current

Definitions

  • DG Distributed Generation
  • DG Distributed Generation
  • Such generators may be associated with new and renewable energy technologies, such as solar, wind, and fuel cells, into the utility grid.
  • the generators may be
  • DG resources are primarily used to supplement the traditional electric power systems.
  • DG resources can be combined to supply nearby loads in specific areas with continuous power during disturbances and interruptions of the main utility grid.
  • the DG resources are connected to the utility grid via inverters also referred to as grid-tied inverters.
  • the grid-tied inverters are power electronic systems commonly used to interface direct current (DC) sources (DER) to the utility grid.
  • the inverter is responsible for converting DC power generated by the DC sources to an alternating current (AC) power synchronized to the utility grid.
  • the quality of the inverter current is required to meet local, national, and/or international standards based on the location and terms of the installation. As an example, applicable standards typically require the inverter to suppress the direct current (DC) component of the output current to a level of 0.5% or less of the rated capacity.
  • a DC source may be connected to an utility grid via an inverter.
  • a control circuit may be configured to detect electrical characteristics, including magnitude and polarity, of DC component at the output of the inverter. The control circuit may compare the detected electrical characteristics with a predetermined value. Based on the comparison the control circuit may alter the operations of the inverter.
  • FIG. 1 is a diagram of a system in which various embodiments of the disclosure may be practiced
  • FIG. 2 is a diagram depicting control circuitry of an inverter
  • FIG. 3 is a flow diagram of a method for managing direct current injection in an inverter
  • FIG. 4 is a flow diagram of a method for detecting DC component in output of an inverter.
  • FIG. 5 is a flow diagram of a method of controlling the operations of an inverter.
  • the inverter may be configured to convert DC energy generated by a DC energy source (such as distributed energy resource) into AC energy.
  • the inverter may be configured to generate the AC energy at a predetermined voltage and frequency to match with that of the utility grid.
  • the operations of the inverter may be controlled by a control circuit.
  • the control circuit may be configured to detect electrical characteristics of the output current of the inverter, including magnitude and polarity of DC component.
  • the control circuit may compare the detected electrical characteristics with a predetermined value. Based on the comparison, the control circuit may alter the operations of the inverter.
  • the control circuit may be configured to alter switching pattern of switches of the inverter.
  • the disclosure provides methods and systems for managing injection of DC component in the utility grid by the inverter.
  • FIG. 1 depicts a system 100 in which various embodiments of the disclosure may be practiced.
  • System 100 may include a DC source 102 connected to AC grid 106 through a DC to AC converter 104.
  • DC source 102 may be connected to DC to AC converter 104 through a DC link bus 108.
  • Output of DC source 102 may be connected to DC link bus 108.
  • DC link bus 108 may in turn be connected to DC side (also referred to as input side) of DC to AC converter 104.
  • An AC side (also referred to as output side) of DC to AC converter 104 may be connected to AC grid 106.
  • System 100 may further include a control circuit 110 configured to control the operations of DC to AC converter 104.
  • DC source 102 may be a device configured to generate DC power.
  • DC source 102 may be a distributed energy resource or a renewable energy resource, such as a solar panel, a diesel generator, a wind mill, etc.
  • DC source 102 may be connected to DC to AC converter 04 through DC link bus 108.
  • DC source 102 may be configured to provide power or absorb power from AC grid 106 through DC to AC converter 104.
  • DC to AC converter 104 may be an electrical power converter device configured to convert DC energy generated by DC source 102 into AC energy.
  • DC to AC converter 104 may be a sine wave grid-tied inverter designed to inject electricity into AC grid 106.
  • DC to AC converter 104 may be configured to synchronize with the frequency of the AC grid 106, and inject less than a predetermined level of harmonic distortion.
  • DC to AC converter 104 may be a single stage flyback converter.
  • DC to AC converter 104 may also be referred to as inverter 104.
  • a capacitor bank 108 may be connected in parallel to DC source 102.
  • Capacitor bank 108 may be connected in between DC source 102 and inverter 104.
  • Capacitor bank 108 may provide stability from voltage fluctuations on the DC side of DC to AC converter 04.
  • the size and the rating of capacitor bank 108 may be determined on voltage rating of DC source 102 and DC to AC converter 104.
  • a voltage stabilizer may also be used in place of capacitor bank 108.
  • system 100 is shown to include only one capacitor in capacitor bank 108, it will be apparent to a person skilled in the art that more than one capacitor may be used. For example, multiple capacitors may be connected in series or parallel to or in combination.
  • AC grid 106 may be an electricity distribution system grid.
  • AC grid 106 may be a secondary voltage grid, supplying power to residential areas.
  • the voltage and frequency of the AC grid 106 may be predetermined and fixed.
  • Other electrical characteristics of AC grid 106, such as power factor limit, total harmonic distortion limit, may be predefined.
  • FIG. 1 is shown to include only one DC to AC converter, it will be apparent to person with ordinary skill in the art that inverter 100 may include multiple DC to AC converters. As an example, multiple DC to AC converters may be connected in series or parallel to or in combination of both to the same DC source 102 at the input and AC grid 106 at the output. Similarly, only one DC source is shown in system 100, it will be apparent to those with ordinary skill in the art that multiple DC sources may be connected together in series and parallel with one or more DC to AC converters.
  • System 100 may be configured to adapt the output of DC source 102, for use with utility power grid, maintaining approximately maximum power output from the DC source 102, and efficiently transferring that power to AC grid 106.
  • DC source 102 voltage and power may be regulated, and DC to AC converter 104 output current and voltage may be controlled.
  • a DC component may be present in the output current for many reasons such as the presence of a DC shift in the current reference, or in the output of the current sensor.
  • Applicable standards may determine an amount of DC component which may be injected into AC grid 106 by system 100. To meet these standards, DC component being injected into AC grid 106 by inverter 104 must be suppressed or maintained within defined standard limits.
  • Output current of grid-tied inverters may be controlled through the utilization of a feedback control loop.
  • the control loop may depend on output current sensing circuitry in order to provide the appropriate control action to control this current.
  • Proper suppression of DC-component injection may require accurate and stable sensing of the DC component that can detect its existence and polarity at or above the standard limit.
  • Various exemplary embodiments are described herein, including systems adapted to control DC component in output current of DC to AC converter 104.
  • the DC-component injection may be detected by detecting a ripple component in DC bus 108 voltage at the line frequency.
  • the presence of the DC-component, along with magnitude and polarity may be detected at capacitor bank 110.
  • the detection of the magnitude and polarity of DC- component may be used to limit or suppress the DC-component being injected by the inverter.
  • feeding current, i 0 into AC grid 106 with voltage,x3 ⁇ 4 may be represented as:
  • V 1 is an amplitude of the voltage component at line frequency
  • ⁇ , l x is the amplitude of the current component at line frequency
  • I dc is the DC-current injection components
  • ⁇ is the phase angle of the current relative to voltage.
  • An instantaneous power output from inverter 104 may be calculated from the voltage of equation (1) and the current of equation (2).
  • the instantaneous power may be calculated by multiplying the voltage and the current and may be represented as:
  • the instantaneous power output as calculated in equation (3) may be converted by DC to AC converter 104, and may be drawn from capacitor bank 108.
  • DC source 102 may replenish capacitor bank 108 charge by providing the average component at a steady rate.
  • the power input from DC source to replenish capacitor bank 108 charge may be represented as:
  • the instantaneous power output from invert 104 may have three component.
  • the two other power terms in equation (3) may have a zero average component.
  • the power terms with zero average components may be handled by capacitor bank 108 and may not require replenishment from DC source 102.
  • the power terms with zero average component may produce ripple at corresponding frequencies, resulting in the bus voltage expressed as: P T/US2013/044695
  • the equation (5) shows that the bus voltage has a ripple component at double line frequency that is associated with the pulsating nature of AC power, and grows proportionally to average power delivered.
  • the equation (5) may also be interpreted to reveal another component at line frequency that is proportional to the DC component in the output current.
  • the presence of line-frequency component of bus voltage ripple may be used to detect the presence and polarity of DC component injection.
  • the presence of this ripple component may be detected by applying sinusoidal component analysis.
  • the sinusoidal component analysis may be applied by using a quadrature sine wave at the line frequency in bus voltage calculated in equation (5), and may be represented as:
  • v bus (t) ⁇ sin(o) ⁇ t) V nom ⁇ * ⁇ ⁇ ( ⁇ ⁇ t) - -— ⁇ V t ⁇ I dc ⁇ ⁇ / 2 ⁇ 2 ' cos(2 ⁇ ⁇ ⁇ t)l - -7— ⁇ - 1 ⁇ [7 ? ⁇ cos(w ⁇ t + ⁇ - 1 / 2 ⁇ cos(3 ⁇ ⁇ ⁇ t +
  • DC component may be extracted by averaging equation (6).
  • a low-pass filter may be used to average h(t) and extract its DC component.
  • the use of low-pass filter may eliminate all terms with a sinusoidal component.
  • the extracted DC component may be represented as:
  • equation (7) may provide a directional indication of the presence of DC-component injection. Therefore, equation (7) may be used along by the control circuit 110 to detect DC-component injection by inverter 104, in AC grid 106. The control circuit is described in more detail in following part of the disclosure in reference to FIG. 2.
  • FIG. 2 illustrates a control circuit 110 configured to control operations of inverter 04. More specifically, FIG.2 illustrates component of control circuit 110, to detect and manage DC component injection by inverter 104. As explained above, the operation of inverter 104 may be controlled by control circuit 110. As a result, by including a DC component suppression element in feedback control loop of control circuit 110, DC component injection by inverter 104 may be managed. As shown in FIG.
  • control circuit 110 may include a sensor 202, BVR 204, AC-coupling 206, sine wave source 208, quadrature sine wave 210, a first multiplier 212, a second multiplier 214, a low pass filter or an averaging circuit 216, DC-current injection controller 218, an aggregator 220, and an output current regulator (OCR) 222.
  • OCR output current regulator
  • Control circuit 110 may control the operations of inverter 104 by providing voltage and current regulation which drives inverter 104.
  • OCR 222 may be configured to control the operation of inverter 104 power stage.
  • OCR 222 may utilize a sensor signal representing the output current to force the output current to follow a sinusoidal reference provided to it.
  • Sensor 202 may be configured to sense a current l se ns at the output of inverter 104. Thereafter the sensed current ⁇ sens may be provided to OCR 222.
  • OCR 222 may be configured to compare Isens with a reference current 5
  • the reference current l re f may include a magnitude and a current wave shape. Further it will be apparent to a person with skill in the art that the reference current l re f may be the current that is required to flow into AC grid 106.
  • the magnitude of the reference current l re f may be calculated by BVR 204.
  • BVR may calculate the magnitude of the reference current l re f using the input voltage and the current received from DC source 102, to its maximum power point (or value).
  • the current value and the voltage value from DC source 102 may be sensed to determine the maximum power obtainable from DC source 102.
  • the magnitude of l re f may be derived from the determined maximum power.
  • the current magnitude l 0 _ SC aiar and the waveform generated by sine wave source 208 as described below may be used to generate the reference current l 0 _ re f-
  • the wave shave of the l re f may be generated by sine wave source 208.
  • Sine wave source 208 may be configured to generate sine wave shape.
  • the sine wave shape generated by the sine wave source 208 and the current magnitude l 0 _ SC aiar generated by BVR 204 may be multiplied by multiplier 214 to generate l 0 _ re f.
  • the sensed voltage value from DC source 102 may be used to detect DC-current component, and generate a correction factor for control of DC-current injection in AC grid 106.
  • Sensed voltage value from DC source 102 may be multiplied by a sine wave that is 90 degrees out of phase relative to the fundamental voltage component.
  • Sine wave that is 90 degrees out of phase relative to the fundamental voltage component may be generated by quadrature sine wave source 210.
  • the sine wave may also be 4695 generated by from the sensed voltage signal using various filtering
  • the sine wave and the sensed voltage may be multiplied by multiplier 212.
  • the output from the multiplier may provide sinusoidal component analysis as represented by equation (6).
  • the output of the multiplier 2 2 may be provided as input to low pass filter or an averaging circuit 216.
  • Low pass filter or an averaging circuit 216 may apply an averaging technique on the product to in order to extract h t) as represented in equation (7).
  • the output from low pass filter or an averaging circuit 216 may be fed into DC-current injection controller 218.
  • DC-current injection controller 218 may be configured to generate a DC-current correction component.
  • DC-current injection controller 218 may also be configured to adjust the DC-current correction component in real time in order to minimize the value of (t), and DC-injection
  • the DC-current correction component may be fed into
  • aggregator 220 along with the l 0 _ref- Aggregator 220 may be configured to incorporate the DC-component correction component with the l 0 _ref to generate l re f.
  • the l re f generated by aggregator 220 may be provided to OCR 222.
  • an AC- coupling technique may be used to isolate the ripple component of the bus voltage measurement that is used by the algorithm.
  • the AC-coupling technique may allow for faster detection and rejection of the DC-component in the output current.
  • the sensed voltage from DC bus may be provided to AC-coupling circuit 206.
  • the output from AC coupling circuit may be fed into multiplier 212 along with the output from the quadrature sine wave source 210.
  • FIG. 3 is a flow diagram illustrating a method for managing injection of DC-current component in AC grid 106.
  • the DC-current may be injected inverter 104.
  • DC power may be generated by DC source 102.
  • DC power may be generated by a solar panel which acts as a DC source 102.
  • the DC power generated by DC source 102 may include a DC current component and a DC voltage component.
  • the generated DC power may be converted into AC power by inverter 104.
  • the AC power may include an active component and a reactive component.
  • the power flow from DC source 102 to AC grid 106 may be referred to as the active component.
  • the power flow from AC grid 106 to the DC source 102 may be referred to as the reactive
  • Inverter 104 may be a single stage DC to AC converter.
  • a magnitude and polarity of DC-current component at the output of inverter 104 may be detected.
  • the magnitude and the polarity of the DC-current component may be detected by the control circuit 110 described with reference to FIG.1 and FIG. 2.
  • the operations of inverter 104 may be altered to minimize the magnitude and the polarity of the DC-current component.
  • the operations of inverter 104 may be altered by control circuit 110.
  • FIG. 4 is a flow diagram illustrating steps of a method for detecting DC-current component in output of a grid-tied inverter.
  • a bus voltage at DC bus 108 may be sensed.
  • the bus voltage may be sensed by a voltage sensor at line frequency.
  • the sensed bus voltage may be multiplied by a sine wave that is 90 degrees out of phase relative to a fundamental voltage component.
  • the sine wave may be generated by quadrature sine wave source 210 or a phase locked loop (PLL).
  • the product of the sensed bus voltage and the sine wave may be averaged to extract DC-current component.
  • the product may be averaged by an averaging circuit or a low pass filter.
  • the average of the product may be fed to a DC component controller 218.
  • DC component controller 218 based on the average of the product, may generate a DC component correction signal.
  • FIG. 5 is a flow diagram of a method of controlling the operations of a grid-tied inverter.
  • an input voltage and input current from DC source 102 may be sensed.
  • the current and the voltage at the output of invertor 104 may be sensed.
  • DC component correction element may be generated.
  • the DC component correction element may be generated from the sensed input voltage, and by using the method described with reference to FIG. 4.
  • magnitude of the reference current may be derived.
  • the phase of the reference current may be derived based on the output voltage of the inverter 104 sensed at step 502b.
  • the reference current l ref may be generated based on the magnitude and the phase of the reference current, and the DC component correction element.
  • the reference current l ref generated may be compared with the sensed 5 current l sen s from block 502b.
  • the sensed current l se ns is the current component of the generated AC power obtained at the output of inverter 04.
  • control signals are generated based on the comparison of the reference current l re f and the sensed current l se ns to alter operations of inverter 104.
  • the DC- component correction element generated by the algorithm may be applied to the output current measurement signal, the output current reference signal, or both.
  • the polarity and gain may be adjusted accordingly.
  • the methods and systems disclosed herein may be valid irrespective of whether average power is being exported or imported into the host electrical system.
  • the algorithms may further be valid irrespective of whether reactive power is being processed, whether leading or lagging.
  • a secondary algorithm may be used to adjust the harmonics content of the output current.
  • the adjustment of harmonic current in the output current may enhance the accuracy of the detection and rejection algorithms.
  • the methods and systems described herein to manage injection of DC component by an inverter may be adopted for inverters that do not incorporate a pre-regulator DC-DC converter.
  • the methods and systems may be adopted for inverters that utilize a DC-DC converter to control the output current, followed by an un-folder circuit, such as a switching bridge operated at line- frequency.
  • Embodiments of the invention may be practiced in an electrical circuit comprising discrete electronic elements, packaged or integrated electronic chips containing logic gates, a circuit utilizing a microprocessor, or on a single chip containing electronic elements or microprocessors.
  • Embodiments of the invention may also be practiced using other technologies capable of performing logical operations such as, for example, AND, OR, and NOT, including but not limited to mechanical, optical, fluidic, and quantum technologies.
  • embodiments of the invention may be practiced within a general purpose computer or in any other circuits or systems.
  • Embodiments of the invention may be implemented as a computer process (method), a computing system, or as an article of manufacture, such as a computer program product or computer readable media.
  • the computer program product may be a computer storage media readable by a computer system and encoding a computer program of instructions for executing a computer process.
  • the computer program product may also be a propagated signal on a carrier readable by a computing system and encoding a computer program of instructions for executing a computer process.
  • the present invention may be embodied in hardware and/or in software (including firmware, resident software, micro-code, etc.).
  • embodiments of the present invention may take the form of a computer program product on a computer- usable or computer-readable storage medium having computer-usable or computer-readable program code embodied in the medium for use by or in connection with an instruction execution system.
  • a computer-usable or computer-readable medium may be any medium that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
  • the computer-usable or computer-readable medium may be, for example but not limited to, an electronic, magnetic, optical,
  • the computer-readable medium may include the following: an electrical connection having one or more wires, a portable computer diskette, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, and a portable compact disc read-only memory (CD-ROM).
  • the computer-usable or computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted, or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

L'invention concerne des systèmes et des procédés de gestion d'un composant à courant continu (CC) d'un onduleur raccordé au réseau électrique. Une source de CC peut être raccordée à un réseau électrique public par l'intermédiaire d'un onduleur. Un circuit de commande peut être configuré pour détecter une intensité et une polarité du courant CC à la sortie de l'onduleur. Sur la base des valeurs détectées d'intensité et de polarité, le circuit de commande peut modifier le fonctionnement de l'onduleur.
PCT/US2013/044695 2012-06-08 2013-06-07 Systèmes de gestion d'une injection de courant continu WO2013185025A1 (fr)

Applications Claiming Priority (2)

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US201261657053P 2012-06-08 2012-06-08
US61/657,053 2012-06-08

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6021052A (en) * 1997-09-22 2000-02-01 Statpower Technologies Partnership DC/AC power converter
US7365661B2 (en) * 2002-11-14 2008-04-29 Fyre Storm, Inc. Power converter circuitry and method
US20110032738A1 (en) * 2009-08-10 2011-02-10 Emerson Climate Technologies, Inc. System and method for power factor correction

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6021052A (en) * 1997-09-22 2000-02-01 Statpower Technologies Partnership DC/AC power converter
US7365661B2 (en) * 2002-11-14 2008-04-29 Fyre Storm, Inc. Power converter circuitry and method
US20110032738A1 (en) * 2009-08-10 2011-02-10 Emerson Climate Technologies, Inc. System and method for power factor correction

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