WO2003003552A2 - Bidirectional flyback switch mode power supply (smps) - Google Patents
Bidirectional flyback switch mode power supply (smps) Download PDFInfo
- Publication number
- WO2003003552A2 WO2003003552A2 PCT/IB2002/002364 IB0202364W WO03003552A2 WO 2003003552 A2 WO2003003552 A2 WO 2003003552A2 IB 0202364 W IB0202364 W IB 0202364W WO 03003552 A2 WO03003552 A2 WO 03003552A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- primary
- switch
- control unit
- power supply
- winding
- Prior art date
Links
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
-
- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
-
- 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
- H02M3/33569—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 having several active switching elements
- H02M3/33576—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 having several active switching elements having at least one active switching element at the secondary side of an isolation transformer
- H02M3/33584—Bidirectional converters
Definitions
- SMPS Bidirectional flyback switch mode power supply
- the present invention relates to a bidirectional flyback converter.
- switch mode converter is conventionally used in the art to describe a circuit which takes a DC or AC input and provides a single or multiple DC output, of the same or opposite polarity and lower or higher voltage.
- Switch Mode Power Supply is a common denomination to describe switch mode regulators and converters.
- a flyback SMPS circuit transfers energy from an inductor to the output capacitor when a switching element (e.g. a transistor) on the primary side is switched off, whereas a feedforward SMPS circuit will supply energy to the output capacitor when the switching element is switched on.
- the principle power train structure of the bidirectional flyback has been known for a long time, and is e.g. described in US 3986097 and EP 0013332.
- a bidirectional or reciprocating converter is a converter in which energy is periodically fed back from the secondary side into the primary side.
- a conventional flyback switched mode power supply transfers energy in only one direction, i.e. from the input circuit to the output circuit.
- Such a bidirectional converter is e.g. known from US 5768118.
- the reciprocating converter uses a secondary switch (in parallel with the secondary rectifier) to allow the secondary current to cross zero and change sign to a negative value as it ramps down. When the switch of the secondary side opens, a negative current appears on the primary winding, and this current reduces the voltage on the switch of the primary side. After the voltage on the switch of the primary side has been reduced to an acceptable minimum level, the switch of the primary side is closed, and the input voltage causes the primary current to resume ramping up.
- the AC wall voltage is filtered and rectified to produce an unregulated DC input voltage.
- This unregulated DC input voltage is then provided to an input circuit which is connected to the primary winding of a power transformer.
- An output circuit is connected to the secondary winding of the power transformer, whereby the voltage at the output of the output circuit develops the appropriate DC voltage or DC current levels for an electronic device.
- the compact size and high efficiency of switched mode power converters are very advantageous in electronic equipment, such as laptop computers, for charging batteries, etc.
- the different mains voltages in various countries can then suitably be used to operate the equipment without adaptation or change-over.
- the invention provides a method of operating a bidirectional flyback switch mode power supply (SMPS), comprising the steps of: ramping up current in a first direction through a primary winding of a transformer at the primary side of the converter; opening a primary switch which is in series with said primary winding, thereby driving current through a secondary winding of said transformer at a secondary side of the converter which is inductively coupled to said primary winding; controlling a secondary switch which is in series with said secondary winding, to permit said secondary winding to pass current in a first direction, and, subsequently, to permit said current to pass through said secondary winding in a second direction which is opposite to said first direction, so as to ? drive current through said primary winding in a second direction which is opposite to said first direction; wherein the secondary switch is further controlled in order to provide a controlled output power on the secondary side; and wherein the primary switch is further controlled in order to compensate input voltage variations.
- SMPS bidirectional flyback switch mode power supply
- the invention provides a new control mechanism for a bidirectional flyback, which alleviates the above-discussed disadvantages. Especially, the control mechanism allows a relatively small amount of the circulating energy that results in a good load efficiency of the converter parts ?. Even in a no-load situation, the power dissipation can be made small at a finite switching frequency.
- the primary switch is further preferably controlled in order to minimize circulating power.
- the primary switch comprises a field-effect transistor (FET), preferably a MOSFET, wherein said switch is controlled so as to compensate input voltage variations by keeping the valley of the drain voltage at a relatively constant value.
- FET field-effect transistor
- This control can be exercised in a very simple manner and proved to be surprisingly effective. Specifically, this control could limit the circulating power in the converter in a very simple and cost-effective way.
- the field-effect transistor is controlled to compensate input voltage variations by controlling the valley of the drain voltage in dependence on the input voltage.
- This control can also be exercised in a simple manner and likewise proved to be very effective. Specifically, this control could provide an absolute minimization of the circulating power in the converter over the full input voltage range, as well as total control of the circulating power in the converter.
- the invention relates to a bidirectional flyback switch mode power supply (SMPS) comprising: a transformer having primary and secondary windings inductively coupled together, said primary winding being coupled to a voltage input of the converter and said secondary winding being coupled to a voltage output of the converter; a primary control unit comprising a primary switch arranged in series with the primary winding; a secondary control unit comprising a secondary switch arranged in series with the secondary winding; characterized in that the primary control unit is adapted to compensate input voltage variations, and in that the secondary control unit is adapted to provide a controlled output power on the secondary side.
- SMPS bidirectional flyback switch mode power supply
- the invention thus provides the same control mechanism as that discussed above, with the same advantages.
- Fig 1 is a schematic illustration of a general flyback converter according to an embodiment of the invention
- Fig 2 is a schematic illustration of an embodiment of the control unit in the converter in fig 1 ;
- Fig 3 is a diagram illustrating the waveforms and modes of the voltages and currents of the primary and secondary side, respectively, during operation of the bidirectional flyback converter in fig 1 ;
- Fig 4 illustrates primary-side peak currents for conventional bidirectional flyback converters
- Fig 5 illustrates the circulating energy in conventional bidirectional flyback converters.
- Fig 6 illustrates a simple detection circuit to be used in an embodiment of the invention.
- a bidirectional flyback switched mode converter is schematically illustrated in Fig 1.
- Said Figure shows is a power transformer 1 with a primary side 2 and a secondary side 3.
- the primary side has a primary winding comprising an inductor 21, and the secondary side has a secondary winding comprising an inductor 31.
- the primary side comprises an input circuit 22, where a DC input voltage, UIN, is connected/applied ? to one end of the inductor 21.
- UIN DC input voltage
- the other end of the inductor 21 is connected to a primary control unit.
- the control unit preferably comprises a transistor, most preferably a metal-oxide-semiconductor field-effect transistor (MOSFET), such as an N-type depletion-mode MOSFET (NMOS), and means for controlling the transistor.
- MOSFET metal-oxide-semiconductor field-effect transistor
- NMOS N-type depletion-mode MOSFET
- U IN could typically be provided by an AC wall voltage, which is passed through a rectifier. UIN typically ranges from 50 to 400 volts. Ip is the current from inductor 21 having the orientation shown in fig 1.
- an output circuit 32 is provided to one end of the inductor 31, providing a DC output voltage, U O U T -
- the other end of the inductor is connected to a secondary control unit 33.
- the secondary control unit preferably also comprises a transistor, most preferably a metal-oxide-semiconductor field-effect transistor (MOSFET), such as an N-type depletion-mode MOSFET (NMOS), and means for controlling the transistor.
- MOSFET metal-oxide-semiconductor field-effect transistor
- the converter uses two controllers: one controller for the primary switch, and one controller for the secondary switch. Each controller controls the on-off switching of the associated switch.
- Each of the control units 23, 33 preferably comprises a switch 231, 331 with an anti-parallel diode 232, 332 and control circuitry 233, 333 that can be either discrete or integrated.
- the control part exhibits input channels to receive information from the converter stage.
- the driver of the control part generates the drive signal for the active switch.
- the switch can be realized by means of any available switching device.
- a MOSFET is used, as this allows the internal body to represent the anti-parallel diode, thereby saving one additional component.
- the drain of the MOSFET or any other transistor is connected to the inductor.
- a parasitic capacitance (not shown) could be arranged so as to lie between the drain of the transistor and the ground.
- the switch is controlled from the control part by means of a control voltage,
- Fig 3 illustrates the principles on which the behavior of the bidirectional flyback converter is based. In order to keep explanations simple, the flyback is assumed to be ideal. This means that no parasitic elements are included (leakage and stray inductances as well as parasitic capacitances). The dead time during which the soft transition occurs (zero voltage switching, ZVS) will also be neglected during the explanation.
- conduction mode I at the primary side
- conduction mode II at the secondary side. Both modes can be divided into two sub-modes.
- energy is delivered to the relevant side
- second period B energy that is to be delivered to the other side is stored in the transformer.
- Fig 3 illustrates the currents and voltages of the bidirectional energy flyback switched mode power supply.
- the primary switch is turned on.
- I p ramps upward due to the DC voltage, U IN , which is present across inductor 21.
- Is there is no secondary current, Is. This is attributable to the fact that the secondary switch is turned off.
- the positive primary current, I P stores energy in the magnetic field of transformer 1 during the time from until t 3 .
- Sp turns off the switch in the primary control unit 23 at time t 3 .
- Ss turns on the secondary switch in the secondary control unit 33 after a short delay not shown in fig 3.
- Is a positive secondary current
- the current can flow either through a rectifier diode - in the case of a MOSFET the internal body can be used - or through the switch, if a bidirectional switch is used and activated.
- the switch can be switched on during the complete period A under zero voltage condition or at reduced switching losses.
- the secondary current, Is is allowed to ramp down to negative currents before the switch of the secondary side opens.
- a negative current appears on the primary winding, and this current reduces the voltage on the switch of the primary side.
- the switch of the primary side is closed, and the primary current begins to ramp up again.
- a dead time between the control signals for the two switches together with the correct direction of the transformer currents results in zero voltage switching or reduced switching losses.
- the switching losses are eliminated or at least reduced. This makes it possible to use a higher switching frequency and thus allows more efficient and/or smaller/cheaper designs.
- the bidirectional flyback converter provides a power flow from the primary to the secondary side but also in the opposite direction, i.e. from the secondary to the primary side.
- the control at the secondary side can reflect excessive power back to the primary side. This makes it possible to regulate output voltage or output current at the secondary side. Thus, an isolating feedback path can be avoided.
- the main task of the primary-side control is to supply enough energy to the secondary side.
- the secondary-side controller Under steady-state conditions, a certain minimum amount of energy is reflected back to the primary side. Under no-load conditions the secondary-side controller will reflect the complete energy transferred from the primary side, minus the energy dissipated during one cycle through the transformer. The energy transfer from and to the secondary side needs a certain time span. Thus, the converter is preferably regulated at a finite frequency.
- the input signals to the control unit at the secondary side are preferably the output voltage and/or the output current because these are easily accessible values. These values are compared with the corresponding reference values.
- the resulting error signal is used to set the amount of reflected output power.
- the amount of output power could be determined either by controlling the negative peak current or by controlling the forward conduction time of the secondary switch.
- the derivation of the control value from the error signal could be done by conventional techniques, such as an error amplifier with Pi-characteristics, etc.
- the output current at the secondary side is substantially a DC current, and is measured after the output smoothing resistance.
- the secondary current, Is can be momtored by a current sensor, such as a resistor, connected in series with the secondary winding 31 , or can be estimated by monitoring the elapsed time from time t3 when the secondary switch 331 is first turned on.
- the output voltage could e.g. be detected by a voltmeter or the like.
- One additional signal is preferably provided, indicating whether the diode is conducting.
- This signal allows to switch-on the active switch under zero voltage conditions.
- the signal can be derived either from the voltage across the parallel combination of active switch and anti-parallel diode or by the current through this combination. Thus, the signal can be derived by conventional methods. However, if the switch should be switched on at reduced switching losses, i.e. no real zero voltage condition, it is sufficient to monitor the voltage across the switch and switch it on when an acceptable level is reached.
- the primary control part is preferably also provided with a signal indicating whether the corresponding anti-parallel diode is conducting or with a signal indicating the presence of a valley in the switch voltage.
- signals can be derived using conventional methods.
- the signals allows to switch-on the primary switch under zero voltage conditions or at reduced switching losses.
- the primary control should preferably be provided with a signal that ensures an energy transfer that is high enough for all load situations.
- control variables are further possible, e.g. fixed peak current, fixed switching frequency, fixed on-time, etc., as is known in the art. However, as will be discussed in the hereinafter with reference to figs. 4 and 5, this approach is not useful in applications that have to deal with a substantial input voltage variation.
- Fig 5 The corresponding amount of circulating energy, normalized to the maximum output power, in dependence on the load for different input voltages is shown in Fig 5.
- fig 5 dotted lines indicate the circulating energy for minimum input voltages, solid lines indicate the circulating energy for nominal input voltages and dashed lines indicate the circulating energy for maximum input voltages. While for low input voltages the amount of circulating energy is relatively small for all load situations, the amount of circulating energy ramps up to five times (in this example) the maximum output power. This clearly demonstrates the drawback of such a control system. In the case of wide input ranges, this method is not acceptable.
- said drawback is obviated by controlling the control units so as to tackle the input voltage variation at the primary side, while load regulation/variation ? is tackled at the secondary side.
- the primary-side control unit comprises a MOSFET
- the MOSFET could, to this end, be controlled in such a way that the valley of the drain voltage is kept at a constant value.
- the valley of the drain voltage could be controlled in dependence on the input voltage.
- the input voltage, Vm could, to this end, be monitored through a voltmeter or an auxiliary winding of transformer 1.
- the drain voltage valley could be detected with a conventional sample-and-hold technique or with a simple detection circuit comprising the auxiliary winding (aux), as illustrated in fig 6.
- the valley on the drain is a peak.
- the diode D and the capacitor C form a simple peak rectifier.
- a resistance R dis can be added for improved dynamic behavior of the converter.
- a simple PI error amplifier could be used for controlling the device accordingly.
- the setpoint (i.e. the desired value) of the valley could be made a function of Vj.
- V set could be proportional to Vj.
- a converter as described above tackles the input voltage variation at the primary side while load regulation is tackled at the secondary side. As a result, the amount of circulating energy in the converter is minimized to the level indicated by the dotted line in fig 5 for all input voltages. This leads to a much more efficient and cost-effective converter, due to the elimination of the isolated feedback, higher efficiency, lower electromagnetic interference (EMI), smaller size, etc.
- EMI electromagnetic interference
- the converter according to the invention could be used both for AC-DC and DC-DC power conversion. It is especially suitable for all applications in the lower power range, i.e. up to a few hundreds Watts.
- the primary and secondary control units may operate independently of one another, or one controller may be dependent on the signals generated by the other controller. If the two controllers operate independently of one another, each controller must monitor the states of the power supply in order to determine the appropriate switching times. If the two controllers interact with each other, one controller operates a master controller, and one operates as a slave controller.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/480,657 US7046525B2 (en) | 2001-06-28 | 2002-06-20 | Bidirectional flyback switch mode power supply (SMPS) |
EP02738467A EP1405396A2 (en) | 2001-06-28 | 2002-06-20 | Bidirectional flyback switch mode power supply (smps) |
KR10-2003-7003087A KR20040014998A (en) | 2001-06-28 | 2002-06-20 | Bidirectional flyback switch mode power supply(SMPS) |
JP2003509613A JP2004531198A (en) | 2001-06-28 | 2002-06-20 | Bidirectional flyback switch mode power supply (SMPS) |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP01202501 | 2001-06-28 | ||
EP01202501.1 | 2001-06-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2003003552A2 true WO2003003552A2 (en) | 2003-01-09 |
WO2003003552A3 WO2003003552A3 (en) | 2003-06-05 |
Family
ID=8180558
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2002/002364 WO2003003552A2 (en) | 2001-06-28 | 2002-06-20 | Bidirectional flyback switch mode power supply (smps) |
Country Status (7)
Country | Link |
---|---|
US (1) | US7046525B2 (en) |
EP (1) | EP1405396A2 (en) |
JP (1) | JP2004531198A (en) |
KR (1) | KR20040014998A (en) |
CN (1) | CN1520633A (en) |
TW (1) | TW576004B (en) |
WO (1) | WO2003003552A2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003088460A2 (en) * | 2002-04-12 | 2003-10-23 | Delta Energy Systems (Switzerland) Ag | Soft switching high efficiency flyback converter |
EP3525333A1 (en) | 2018-02-07 | 2019-08-14 | Siemens Aktiengesellschaft | Bi-directional paralysis circuit |
CN113169675A (en) * | 2018-12-03 | 2021-07-23 | 蒂森克虏伯普利斯坦股份公司 | Flyback converter with two or more independent output stages |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
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DE102004061341A1 (en) * | 2004-12-20 | 2006-07-06 | Puls Gmbh | Current supply e.g. adapter, switch actuator or switching network part, with high adjuster, resonance converter and control unit, in which high adjuster is coupled to resonance converter |
US7787262B2 (en) | 2005-05-09 | 2010-08-31 | Allegro Microsystems, Inc. | Capacitor charging methods and apparatus |
US7646616B2 (en) * | 2005-05-09 | 2010-01-12 | Allegro Microsystems, Inc. | Capacitor charging methods and apparatus |
US9436198B2 (en) * | 2006-03-23 | 2016-09-06 | Enphase Energy, Inc. | Method and apparatus for power conversion |
WO2008024529A2 (en) * | 2006-08-25 | 2008-02-28 | Lawson Labs, Inc. | Bi-polar bi-directional energy-balancing power-conversion engine |
US7586762B2 (en) * | 2006-12-12 | 2009-09-08 | O2Micro International Limited | Power supply circuit for LCD backlight and method thereof |
US8958217B2 (en) * | 2012-06-15 | 2015-02-17 | General Electric Company | System for driving a piezoelectric load and method of making same |
US10763752B1 (en) * | 2019-06-25 | 2020-09-01 | Chengdu Monolithic Power Systems Co., Ltd. | Zero-voltage-switching flyback converter |
US9603205B2 (en) * | 2014-07-07 | 2017-03-21 | Dialog Semiconductor Inc. | Multi-function terminal configurable to implement two functionalities |
TWI558084B (en) * | 2015-04-17 | 2016-11-11 | Bidirectional power control and dual power module parallel return controller | |
US10128766B1 (en) * | 2017-08-29 | 2018-11-13 | Nxp B.V. | Method and apparatus for bi-directional switched mode power supply with fixed frequency operation |
EP3696962A1 (en) | 2019-02-14 | 2020-08-19 | Power Research Electronics B.V. | Bidirectional power converter |
CN112865544A (en) * | 2021-02-20 | 2021-05-28 | 阳光电源股份有限公司 | Bidirectional DCDC power supply and charging pile |
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US5109326A (en) * | 1991-01-10 | 1992-04-28 | Unisys Corporation | High efficiency power converting cell, and versatile system of same |
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AT399432B (en) * | 1991-09-05 | 1995-05-26 | Siemens Ag Oesterreich | Flyback converter |
US5745351A (en) * | 1995-01-13 | 1998-04-28 | Sextant Avionique | DC-to-DC bidirectional voltage converters and current sensor |
US6084784A (en) * | 1998-06-24 | 2000-07-04 | U.S. Philips Corporation | Switched mode power supply with reduced reflected power |
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US3986097A (en) | 1975-06-30 | 1976-10-12 | Bell Telephone Laboratories, Incorporated | Bilateral direct current converters |
EP0013332A1 (en) | 1979-01-16 | 1980-07-23 | Siemens-Albis Aktiengesellschaft | Chopper circuit |
JP2773195B2 (en) | 1988-04-05 | 1998-07-09 | 松下電器産業株式会社 | Switching power supply |
JP3419797B2 (en) | 1992-01-10 | 2003-06-23 | 松下電器産業株式会社 | Switching power supply |
US5768118A (en) | 1996-05-01 | 1998-06-16 | Compaq Computer Corporation | Reciprocating converter |
CN1478318A (en) | 2000-11-11 | 2004-02-25 | ������������ʽ���� | Power converter |
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2002
- 2002-06-20 KR KR10-2003-7003087A patent/KR20040014998A/en not_active Application Discontinuation
- 2002-06-20 US US10/480,657 patent/US7046525B2/en not_active Expired - Fee Related
- 2002-06-20 WO PCT/IB2002/002364 patent/WO2003003552A2/en active Application Filing
- 2002-06-20 JP JP2003509613A patent/JP2004531198A/en active Pending
- 2002-06-20 EP EP02738467A patent/EP1405396A2/en not_active Withdrawn
- 2002-06-20 CN CNA028129148A patent/CN1520633A/en active Pending
- 2002-07-30 TW TW91117033A patent/TW576004B/en not_active IP Right Cessation
Patent Citations (5)
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US5220492A (en) * | 1989-12-26 | 1993-06-15 | Systel Development And Industries Ltd. | Inverter and power supply systems including same |
US5109326A (en) * | 1991-01-10 | 1992-04-28 | Unisys Corporation | High efficiency power converting cell, and versatile system of same |
AT399432B (en) * | 1991-09-05 | 1995-05-26 | Siemens Ag Oesterreich | Flyback converter |
US5745351A (en) * | 1995-01-13 | 1998-04-28 | Sextant Avionique | DC-to-DC bidirectional voltage converters and current sensor |
US6084784A (en) * | 1998-06-24 | 2000-07-04 | U.S. Philips Corporation | Switched mode power supply with reduced reflected power |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2003088460A2 (en) * | 2002-04-12 | 2003-10-23 | Delta Energy Systems (Switzerland) Ag | Soft switching high efficiency flyback converter |
WO2003088460A3 (en) * | 2002-04-12 | 2004-02-26 | Delta Energy Systems Switzerla | Soft switching high efficiency flyback converter |
US7450402B2 (en) | 2002-04-12 | 2008-11-11 | Det International Holding Limited | Soft switching high efficiency flyback converter |
EP3525333A1 (en) | 2018-02-07 | 2019-08-14 | Siemens Aktiengesellschaft | Bi-directional paralysis circuit |
CN113169675A (en) * | 2018-12-03 | 2021-07-23 | 蒂森克虏伯普利斯坦股份公司 | Flyback converter with two or more independent output stages |
Also Published As
Publication number | Publication date |
---|---|
WO2003003552A3 (en) | 2003-06-05 |
EP1405396A2 (en) | 2004-04-07 |
US7046525B2 (en) | 2006-05-16 |
JP2004531198A (en) | 2004-10-07 |
CN1520633A (en) | 2004-08-11 |
KR20040014998A (en) | 2004-02-18 |
TW576004B (en) | 2004-02-11 |
US20040252530A1 (en) | 2004-12-16 |
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