WO2010105033A1 - Method for portioning output current of a dc-dc converter between its output capacitor and its power stage - Google Patents
Method for portioning output current of a dc-dc converter between its output capacitor and its power stage Download PDFInfo
- Publication number
- WO2010105033A1 WO2010105033A1 PCT/US2010/026949 US2010026949W WO2010105033A1 WO 2010105033 A1 WO2010105033 A1 WO 2010105033A1 US 2010026949 W US2010026949 W US 2010026949W WO 2010105033 A1 WO2010105033 A1 WO 2010105033A1
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- converter
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- output
- coupled
- load current
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Classifications
-
- 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
- H02M3/33507—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 with automatic control of the output voltage or current, e.g. flyback converters
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- 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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
-
- 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
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
-
- 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
- H02M3/337—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 in push-pull configuration
- H02M3/3376—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 in push-pull configuration with automatic control of output voltage or current
Definitions
- At least one embodiment of the invention relates generally to a method for providing uninterruptible, regulated power to critical and/or sensitive loads. More specifically, at least one embodiment of the invention relates to control of a DC-DC converter of an uninterruptible power supply.
- UPS uninterruptible power supplies to provide regulated, uninterrupted power for sensitive and/or critical loads, such as computer systems and other data processing systems.
- a number of different UPS products are available including those identified under the trade name SMART-UPS from American Power Conversion Corporation of West Kingston RI.
- SMART-UPS American Power Conversion Corporation of West Kingston RI.
- a battery is used to provide backup power for a critical load during blackout or brownout conditions and a DC-DC converter may be used in conjunction with the battery.
- a first aspect of the invention is directed to a method of controlling a DC-DC converter having a predetermined maximum peak load current value.
- the DC-DC converter has first and second outputs to couple to a load with a capacitor coupled across the first and second outputs.
- the method includes in a first mode of operation, charging the capacitor to a predetermined output voltage value, and in a second mode of operation, providing output current having the maximum peak load current value to a load coupled to the output of the DC-DC converter, wherein a first portion of the output current is provided by the DC-DC converter and a second portion of the output current is provided by discharging the capacitor to a voltage value that is less than the predetermined output voltage value.
- the DC-DC converter can include an input to couple to a DC source having a DC voltage, a plurality of switches configured to convert the DC voltage to an AC voltage, a transformer having a first winding and a second winding, the first winding being coupled to the plurality of switches and the second winding being coupled to the first and second outputs, and the method can further include controlling the plurality of switches to limit current in the second winding to a value that is less than the maximum peak load current value. In one version, the voltage value is approximately 50% of the maximum peak load current value.
- the method may further include receiving input power at the input from a battery, and may include providing the output current to the input of an inverter circuit.
- the method may include controlling the plurality of switches and the inverter circuit using a controller contained within an uninterruptible power supply. In the first mode of operation, the method may include providing output current having a value that is less than the maximum peak load current.
- UPS uninterruptible power supply
- an uninterruptible power supply that includes an input to receive power from a first power source, an output to provide power to a load, an inverter coupled to the output, a second input to receive power from a second power source, a DC-DC converter coupled to the second input and including first and second outputs coupled to the inverter, a capacitor coupled across the first and second outputs, and a controller coupled to the DC-DC converter.
- UPS uninterruptible power supply
- the controller is configured to control the DC- DC converter in a first mode of operation to charge the capacitor to a predetermined output voltage value, and configured to control the DC-DC converter in a second mode of operation to provide output current having a maximum peak load current value, wherein a first portion of the output current is provided by the DC-DC converter and a second portion of the output current is provided by discharging the capacitor to a voltage value that is less than the predetermined output voltage value.
- the DC-DC converter may further include a plurality of switches configured to convert the DC voltage to an AC voltage, a transformer having a first winding and a second winding, the first winding being coupled to the plurality of switches and the second winding being coupled to the first and second outputs, and the controller may be further configured to control the plurality of switches to limit current in the second winding to a value that is less than the maximum peak load current value, and the value may be approximately 50% of the maximum peak load current value.
- the UPS may include the second power source, and the second power source may include a battery.
- the controller may be further configured to control the DC-DC converter in the first mode of operation to provide output current to the inverter having a value that is less than the maximum peak load current.
- Another aspect of the invention is directed to a process for producing a DC-DC converter having a peak load current value, a peak load current duration, a nominal DC output voltage, and an allowable minimum output voltage.
- the process includes determining
- a modified peak load current value for the DC-DC converter by multiplying the peak load current value by a factor less than 1, determining a modified DC-DC load current duration for the DC-DC converter by dividing the peak load current duration by the factor, and designing a power stage of the DC-DC converter using the modified peak load current value and the modified DC-DC load current duration.
- the method may further include building the power stage of the DC-DC converter based on the design.
- the method may also include determining a value of an output capacitor for the DC-DC converter based at least in part on the nominal DC output voltage and the allowable minimum output voltage, and coupling the output capacitor to the power stage.
- the method may further include coupling a controller to the DC-DC converter, wherein the controller is configured to control components of the power stage, and to limit current from the power stage to the modified DC-DC load current value.
- the factor may be equal to 0.5.
- Yet another aspect of the invention is directed to an uninterruptible power supply (UPS) that includes an input to receive power from a first power source, an output to provide power to a load, an inverter coupled to the output, a second input to receive power from a second power source, a DC-DC converter coupled to the second input and including first and second outputs coupled to the inverter, a power stage that provides output power at the first and second outputs, and a capacitor coupled across the first and second outputs.
- UPS uninterruptible power supply
- the UPS further includes means for controlling the DC-DC converter in a first mode of operation to charge the capacitor to a predetermined output voltage value, and for controlling the DC-DC converter in a second mode of operation to provide output current having a maximum peak load current value, such that a first portion of the output current is provided by the power stage and a second portion of the output current is provided by discharging the capacitor to a voltage value that is less than the predetermined output voltage value.
- the DC-DC converter may further include a plurality of switches configured to convert the DC voltage to an AC voltage, a transformer having a first winding and a second winding, the first winding being coupled to the plurality of switches and the second winding being coupled to the first and second outputs.
- the value may be approximately 50% of the maximum peak load current value
- the UPS may further include the second power source, and the second power source may include a battery.
- FIG. 1 is a block diagram of an uninterruptible power supply including a DC-DC converter in accordance with one embodiment
- FIG. 2 is a schematic view of a DC-DC converter included in a UPS in accordance with one embodiment
- FIG. 3 is a flow chart of a process for designing a DC-DC Converter in accordance with one embodiment.
- Embodiments of the invention are not limited to the details of construction and the arrangement of components set forth in the following description or illustrated in the drawings. Embodiments of the invention are capable of being practiced or of being carried out in various ways. Also, the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting. The use of "including,” “comprising,” or “having,” “containing”, “involving”, and variations thereof herein, is meant to encompass the items listed thereafter and equivalents thereof as well as additional items.
- FIG. 1 shows a block diagram of a line interactive uninterruptible power supply (UPS) 10 for providing AC power to a load.
- the UPS includes an input 12 to receive AC power from an AC power source, an output 14 that provides AC power, a battery 22 coupled to a DC to DC converter 15, an inverter 18 operatively coupled to the DC to DC converter 15 to receive DC power and to provide AC power, a transfer relay 16 selectively coupled to the UPS input 12 and the inverter 18, a UPS controller 17, an EMI/Surge filter 21, a battery charger 25 and an automatic voltage regulation (AVR) transformer 20 coupled to the transfer relay 16, and at least one AVR relay 23.
- UPS line interactive uninterruptible power supply
- the UPS 10 further includes a UPS controller 17 that monitors and controls the operation of the UPS 10.
- the AVR 20 and its associated relays are optional devices used in at least one embodiment to allow the UPS 10 to operate over a wider range of input voltages. Operation of the AVR 20 is described in co-pending U.S. Patent Application Serial No. 12/360,648, filed January 27, 2009, titled System and Method for Limiting Losses in an Uninterruptible Power Supply, which is hereby incorporated herein be reference.
- the UPS 10 operates as follows.
- the UPS 10 receives input AC power from the AC power source through the input 12, filters the input AC power and provides filtered AC power to the transfer relay 16.
- the transfer relay 16 receives the filtered power and also receives power from the DC/ AC inverter 18.
- the controller 17 determines whether the power available from the AC power source is within predetermined tolerances, and if so, controls the transfer relay to provide the power from the AC power source to the output. If the power from the AC power source is not within the predetermined tolerances, which may occur because of "brown out” or “black out” conditions, or due to power surges, then the controller 17 controls the transfer relay 16 to provide the power from the inverter 18.
- the inverter 18 of the UPS 10 receives DC power from the DC-DC converter 15 and converts the DC power to AC power and regulates the AC power to predetermined specifications. Depending on the capacity of the battery 22 and the power requirements of the load, the UPS 10 can provide power to the load during brief power source dropouts or for extended power outages.
- the controller 17 uses data stored in associated memory, the controller 17 performs one or more instructions and monitors and controls operation of the UPS 10.
- the controller 17 may include one or more processors or other types of controllers.
- the controller 17 is a commercially available, general purpose processor.
- the controller 17 performs a portion of the functions disclosed herein on a general purpose processor and performs another portion using an application-specific integrated circuit (ASIC) tailored to perform particular operations.
- ASIC application-specific integrated circuit
- embodiments in accordance with the present invention may perform the operations described herein using many specific combinations of hardware and software and the invention is not limited to any particular combination of hardware and software components.
- the associated memory of the controller 17 includes data storage that stores computer readable and writable information required for the operation of the UPS 10. This information may include, among other data, data subject to manipulation by the controller 17 and instructions that are executable by the controller 17 to manipulate data.
- the data storage may be a relatively high performance, volatile, random access memory such as a dynamic random access memory (DRAM) or static memory (SRAM) or may be a nonvolatile storage media such as magnetic disk or flash memory.
- DRAM dynamic random access memory
- SRAM static memory
- Various embodiments in accord with the present invention can organize the data storage into particularized and, in some cases, unique structures to perform the aspects and functions disclosed herein. In addition, these data structures may be specifically configured to conserve storage space or increase data exchange performance.
- the DC-DC converter is often oversized to meet peak power demand of pulsed loads that may require relatively high peak power for a short period of time.
- a typical pulsed load powered by a UPS may operate with a 25% duty cycle, drawing input current over only 25% of the UPS output AC waveform.
- the peak power demand rather than the average power demand, drives the design of the DC-DC converter and places high peak current/power requirements on the components that can be used in the design of the DC-DC converter.
- Components such as switches and inductors, which are able to handle the high switching frequency and high peak current of the DC-DC converter can be large and costly.
- the need for large and costly components in the DC-DC converter is eliminated by reducing the peak current through the switches of the DC-DC converter, and providing current to the load during peak periods of the duty cycle using a capacitor coupled to the output of the DC-DC converter.
- FIG. 2 shows a schematic diagram of a DC-DC converter 30 configured to regulate DC power from a battery 32 and provide DC power to a load 62.
- the DC-DC converter 30 may be used as the converter 15 in the UPS of FIG. 1, and in this configuration, the load 62 includes the inverter 18 and a load coupled to the output of the UPS 10.
- the DC-DC converter 30 is a full bridge DC-DC converter which utilizes current mode control and includes a set of power switches 34, 36, 38 and 40, a power transformer 43, a rectifier 42, a power inductor 50 and output capacitor 52.
- the portion of the DC-DC converter excluding the output capacitor may be referred to herein as the power stage of the DC-DC converter.
- DC power from the battery 32 is supplied to the power switches 34, 36, 38, 40 and to the power transformer 43.
- the power switches 34, 36, 38 and 40 and power transformer 43 are operated by a controller, such as controller 17, to produce a regulated AC signal at the output of the transformer.
- the rectifier 42 rectifies the AC signal and provides a rectified AC signal to the power inductor 50.
- the power inductor 50 supplies DC power to the output 60 of the DC-DC converter 30 and the load 62.
- three different currents in the DC-DC converter are represented by arrows 54, 56 and 58.
- the current 54 is the output current from the power stage of the DC-DC converter
- current 56 is current supplied by the capacitor 52
- current 58 is the load current which is equal to the total output current of the DC-DC converter (current 54 + current 56).
- the components of the DC-DC converter are designed to handle the specified maximum peak load current value for the DC-DC converter, and in normal operation of these prior art converters, current 58 is substantially equal to current 54, and the voltage across the capacitor remains constant at a specified value when the DC-DC converter is providing the specified maximum peak current.
- the current 58 is limited by the controller (by controlling the switches) to a value that is approximately one half of the specified maximum peak load current value of the DC-DC converter 30.
- the controller may limit the current to values other than one half of the maximum peak load current value.
- the remainder of the current is supplied by the capacitor 52 following current path 56.
- the DC-DC converter 30 may be designed to operate at a specified maximum peak current value and a minimum allowable output voltage.
- the specified maximum peak current value has an associated limited duty cycle, for example, 25%.
- the DC-DC converter 30 charges the capacitor 52 resulting in a negative value for current 56 during the charge mode.
- the DC-DC converter 30 is able to meet the specified maximum peak current value without requiring the components of the DC- DC converter to sustain the maximum peak current value.
- the rms current through the DC-DC converter is also reduced, allowing smaller and cheaper components to be used in the design of the DC-DC converter.
- the power inductor 50 is able to utilize smaller wire and is required to store less energy. This results in a smaller power inductor 50.
- current rating of the power switches 34, 36, 38, 40 can be reduced in size resulting in smaller, lower cost power switches 34, 36, 38, 40. Heat sink size may also be reduced.
- the copper wire requirements of the power transformer 43 are reduced, resulting in a smaller core volume and core area of the power transformer 43.
- Additional components of the DC-DC converter may also be able to be reduced in size and cost as a result of the reduction in peak and RMS current.
- FIG. 3 shows a flowchart of the design process.
- a design process 100 for a DC-DC converter with a reduced peak current as described above will now be described with reference to FIG. 3, which shows a flowchart of the design process.
- the criteria includes the peak load current value Ipk, the peak load current duration Tcondjoad, the nominal DC output voltage, Vo_dcdc_nom, and the allowable minimum output voltage for the load, Vo_dcdc_min.
- the modified peak load current value Idcdc_pk is calculated.
- the modified peak load current value Idcdc_pk is the maximum current provided by the power stage of the DC-DC converter 30 (current 54 in FIG. 2).
- the capacitance value at the output of the DC-DC converter is calculated based on the nominal DC output, Vo_dcdc_nom, and the allowable minimum output voltage for the load, Vo_dcdc_min.
- the DC-DC converter is designed at stage 110 in the manner known, except that the modified peak load current value Idcdc_pk and the modified DC-DC load current duration Tcondjdcdc are used to design the converter and the controller is configured to operate the power switches and power transformer to limit the peak current of the power stage of the DC- DC converter to the modified peak load current value Idcdc_pk.
- the process 100 is complete resulting in a design for a DC-DC converter in one embodiment having a reduced peak current and as a result, smaller and cheaper components, reducing the overall footprint ant the cost of the converter. Once the design is complete, the DC-DC converter may be constructed.
- DC-DC converters have been described for use in a UPS.
- DC-DC converters may be used in other power systems and may also be used as stand-alone DC-DC converters.
- the UPS of FIG. 1 is a line interactive UPS, and at least one embodiment of a DC-DC converter described herein may be used with other types of UPS's including on-line UPS's and off-line UPS's.
- At least one embodiment described above is directed to a DC-DC converter and the design process for such a converter.
- the DC-DC converter is implemented using a full-bridge converter.
- DC-DC converters may utilize other topologies, and aspects of embodiments of the present invention may be used with buck derived converters, boost converters and buck-boost converters.
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- Engineering & Computer Science (AREA)
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN2010800107333A CN102342009B (en) | 2009-03-13 | 2010-03-11 | Method for portioning output current of dc-dc converter between its output capacitor and its power stage |
AU2010224150A AU2010224150B2 (en) | 2009-03-13 | 2010-03-11 | Method for portioning output current of a DC-DC converter between its output capacitor and its power stage |
EP10710125.5A EP2406875B1 (en) | 2009-03-13 | 2010-03-11 | Method for portioning output current of a dc-dc converter between its output capacitor and its power stage |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/403,771 US8040695B2 (en) | 2009-03-13 | 2009-03-13 | Method for portioning output current of a DC-DC converter |
US12/403,771 | 2009-03-13 |
Publications (1)
Publication Number | Publication Date |
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WO2010105033A1 true WO2010105033A1 (en) | 2010-09-16 |
Family
ID=42200812
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/US2010/026949 WO2010105033A1 (en) | 2009-03-13 | 2010-03-11 | Method for portioning output current of a dc-dc converter between its output capacitor and its power stage |
Country Status (5)
Country | Link |
---|---|
US (1) | US8040695B2 (en) |
EP (1) | EP2406875B1 (en) |
CN (1) | CN102342009B (en) |
AU (1) | AU2010224150B2 (en) |
WO (1) | WO2010105033A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2479812A (en) * | 2010-03-26 | 2011-10-26 | Intel Corp | PSU whereby load current is jointly provided by a rechargeable battery and an adapter in a boost power mode. |
EP3846314A3 (en) * | 2019-12-30 | 2021-07-21 | Schneider Electric IT Corporation | Inverter control strategy for a transient heavy load |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2992117B1 (en) * | 2012-06-19 | 2014-06-13 | Converteam Technology Ltd | CHARGE SUPPLY SYSTEM COMPRISING A CONVERTER CONNECTED TO A NETWORK AND A TRANSFORMER CONNECTED IN PARALLEL OF THE CONVERTER TO LIMIT HOMOPOLAR CURRENT, AND DRIVE CHAIN COMPRISING SUCH A SYSTEM |
US9178441B2 (en) * | 2013-05-17 | 2015-11-03 | Analog Devices, Inc. | Power converter control to avoid imbalance and transformer saturation |
JP6369737B1 (en) | 2018-04-06 | 2018-08-08 | 富士電機株式会社 | Insulated DC / DC converter, control device therefor, and DC / AC converter |
US10601324B1 (en) | 2019-04-17 | 2020-03-24 | Nvidia Corp. | Switched tank-transformer based high step-down ratio DC-DC converter |
CN114006541B (en) * | 2021-11-30 | 2023-06-06 | 国网四川省电力公司电力科学研究院 | Efficiency optimization control method for double-active half-bridge direct-current converter |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6141232A (en) * | 1998-09-30 | 2000-10-31 | Siemens Ag Osterreich | Fixed frequency flyback converter |
US20020054498A1 (en) * | 2000-03-23 | 2002-05-09 | Hisanori Cho | Switching power supply unit |
WO2004098035A1 (en) * | 2003-04-29 | 2004-11-11 | Nucellsys Gmbh | Power converter architecture and method for integrated fuel cell based power supplies |
US20050162019A1 (en) * | 2004-01-23 | 2005-07-28 | Masciarelli Francis J. | Methods and apparatus for providing uninterruptible power |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4648015A (en) | 1984-10-04 | 1987-03-03 | Motorola, Inc. | Filter capacitor discharge circuit for a DC-DC converter |
JP2680914B2 (en) | 1990-05-10 | 1997-11-19 | 甲府日本電気株式会社 | Switching power supply circuit |
US5274539A (en) * | 1991-12-04 | 1993-12-28 | General Electric Company | Capacitance-multiplying converters for supplying distributed pulsed loads |
US5754413A (en) * | 1996-02-23 | 1998-05-19 | Lucent Technologies Inc. | Reduced voltage stress asymmetrical DC-to-DC converter using first and second transformers having differing turns ratios |
JP3673075B2 (en) * | 1998-03-09 | 2005-07-20 | 新電元工業株式会社 | Switching power supply |
US6404658B1 (en) | 1999-05-13 | 2002-06-11 | American Power Conversion | Method and apparatus for converting a DC voltage to an AC voltage |
US6600298B2 (en) | 2001-10-31 | 2003-07-29 | Dell Products L.P. | Switching DC-DC converter with the output voltage changing inversely to any change in the converter inductor current |
US7835164B2 (en) * | 2004-04-28 | 2010-11-16 | Intersil Americas Inc. | Apparatus and method of employing combined switching and PWM dimming signals to control brightness of cold cathode fluorescent lamps used to backlight liquid crystal displays |
CN100472926C (en) * | 2004-05-07 | 2009-03-25 | 松下电器产业株式会社 | Resonant switching power supply device |
US7184282B2 (en) * | 2005-03-11 | 2007-02-27 | Origin Electric Company, Limited | Single-phase power conversion device and three-phase power conversion device |
US7466565B2 (en) * | 2005-06-30 | 2008-12-16 | Tdk Corporation | Switching power supply unit and voltage detection circuit |
US7623362B2 (en) * | 2007-10-30 | 2009-11-24 | Tdk Corporation | Switching power supply unit |
-
2009
- 2009-03-13 US US12/403,771 patent/US8040695B2/en active Active
-
2010
- 2010-03-11 EP EP10710125.5A patent/EP2406875B1/en active Active
- 2010-03-11 AU AU2010224150A patent/AU2010224150B2/en not_active Ceased
- 2010-03-11 CN CN2010800107333A patent/CN102342009B/en active Active
- 2010-03-11 WO PCT/US2010/026949 patent/WO2010105033A1/en active Application Filing
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6141232A (en) * | 1998-09-30 | 2000-10-31 | Siemens Ag Osterreich | Fixed frequency flyback converter |
US20020054498A1 (en) * | 2000-03-23 | 2002-05-09 | Hisanori Cho | Switching power supply unit |
WO2004098035A1 (en) * | 2003-04-29 | 2004-11-11 | Nucellsys Gmbh | Power converter architecture and method for integrated fuel cell based power supplies |
US20050162019A1 (en) * | 2004-01-23 | 2005-07-28 | Masciarelli Francis J. | Methods and apparatus for providing uninterruptible power |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2479812A (en) * | 2010-03-26 | 2011-10-26 | Intel Corp | PSU whereby load current is jointly provided by a rechargeable battery and an adapter in a boost power mode. |
GB2479812B (en) * | 2010-03-26 | 2012-08-08 | Intel Corp | Platform with power boost |
EP3846314A3 (en) * | 2019-12-30 | 2021-07-21 | Schneider Electric IT Corporation | Inverter control strategy for a transient heavy load |
US11258297B2 (en) | 2019-12-30 | 2022-02-22 | Schneider Electric It Corporation | Inverter control strategy for a transient heavy load |
Also Published As
Publication number | Publication date |
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US8040695B2 (en) | 2011-10-18 |
AU2010224150A1 (en) | 2011-09-01 |
EP2406875B1 (en) | 2018-06-27 |
AU2010224150B2 (en) | 2015-11-12 |
US20100232189A1 (en) | 2010-09-16 |
CN102342009A (en) | 2012-02-01 |
CN102342009B (en) | 2013-04-24 |
EP2406875A1 (en) | 2012-01-18 |
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