WO2010020909A1 - Load current detection in electrical power converters - Google Patents
Load current detection in electrical power converters Download PDFInfo
- Publication number
- WO2010020909A1 WO2010020909A1 PCT/IB2009/053555 IB2009053555W WO2010020909A1 WO 2010020909 A1 WO2010020909 A1 WO 2010020909A1 IB 2009053555 W IB2009053555 W IB 2009053555W WO 2010020909 A1 WO2010020909 A1 WO 2010020909A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- circuitry
- load current
- representative
- transformer
- Prior art date
- Legal status (The legal status 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 status listed.)
- Ceased
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
- 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
- H02M3/338—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 a self-oscillating arrangement
- H02M3/3382—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 a self-oscillating arrangement in a push-pull circuit arrangement
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Definitions
- This invention relates to the detection of load currents in electrical power converters, particularly resonant converters.
- the invention provides an electrical power converter comprising a transformer having a primary circuit and a secondary circuit, the primary circuit being energisable by an AC signal to induce a secondary AC signal across the secondary circuit for delivering a load current, detecting circuitry operative to detect a first electrical signal representative of the current in the primary circuit and a second electrical signal representative of the time integral of the voltage across the primary circuit, scaling circuitry for scaling or proportioning the first electrical signal with respect to the second electrical signal by a scaling factor dependent on the leakage and magnetising inductances of the transformer and computational circuitry for combining the scaled first and second electrical signals so as effectively to subtract the scaled second electrical signal from the scaled first electrical signal to derive a difference signal which is representative of the load current reflected on to the primary side of the transformer and is accordingly representative of the actual load current.
- output or load current reconstruction is possible without the need for an auxiliary winding. This is achieved by determining the difference between the primary current and the time integral of the voltage across the primary winding of the transformer.
- the invention provides an electrical power converter comprising a transformer having a primary circuit and a secondary circuit, the primary circuit being energisable by an AC signal to induce a secondary AC signal across the secondary circuit for delivering a load current, detecting circuitry for deriving an electrical signal representative of the load current, wherein the detecting circuitry comprises a circuit element for deriving a first electrical signal representative of the current in the primary circuit, auxiliary circuitry for deriving a second electrical signal representative of the magnetising current flowing in the transformer and computational circuitry for combining the first and second signals so as effectively to subtract the second signal from the first signal to derive a difference signal which is representative of the load current reflected onto the primary side of the transformer and is accordingly representative of the actual load current, wherein the auxiliary circuitry comprises an auxiliary winding across which an auxiliary voltage is induced and integrating circuitry for integrating the auxiliary voltage with respect to time to derive the second electrical signal and wherein the relative magnitudes of the first and second electrical signals are scaled or proportioned in dependence
- output current reconstruction is possible with an auxiliary winding by computing the difference between the primary current and the time integral of the voltage across the auxiliary winding, with these signals being scaled as appropriate.
- the auxiliary winding can be coupled with the primary winding of the transformer, giving the advantage that there is no need for mains isolation for the auxiliary winding.
- Figure 1 shows a general circuit diagram of a series resonant converter
- Figure 2 shows an equivalent circuit of a transformer of the converter of Figure 1 ,
- Figure 3 is a view similar to that of Figure 1 but showing output signals used in the first aspect of the invention
- Figure 4 shows how the output signals of Figure 3 are processed
- Figure 5 is similar to Figure 1 but shows an auxiliary winding associated with the transformer of the converter according to the second aspect of the invention
- Figure 6 shows an equivalent circuit of the transformer of Figure 5
- Figure 7 shows how useful output signals from the circuit of Figure 6 are processed.
- FIG. 1 A general circuit diagram of a series resonant converter is given in Figure 1.
- the converter comprises circuitry 1 for converting a DC input 2 (marked V bus ) into an AC signal which energises the primary winding 3 of a transformer 4.
- the induced secondary AC signal across the split secondary winding 5a, 5b of the transformer 4 is rectified by second converter circuitry, including two diodes 6 and 7, into a DC output voltage 8 marked V ou t for delivering a load current.
- the first converter circuitry induces rectangular profile pulses Gh and Gl in alternate sequence at a controlled frequency.
- the pulses are fed into a resonant circuit consisting of a capacitor 9, series leakage inductance 10 and magnetising inductance 12 carrying the magnetising current.
- the transformer 4 is represented as an ideal transformer with a turns ratio of N:1 :1 , being the ratio of turns of the primary winding 3, one half 5a of the split secondary winding and the other half 5b of the split secondary winding.
- the primary winding 3 and the magnetising inductance 12 are shown in parallel, this parallel arrangement carrying the primary current and being in series with the leakage inductance 10 and the capacitor 9.
- This parallel arrangement is also in series with a sensing resistor 13 which carries the primary current.
- the voltage across the resistor 13 is representative of the primary current.
- Figure 2 shows an equivalent circuit of the transformer with leakage inductance modelled at the primary side.
- m is the voltage V cap minus the voltage across the inductance 10.
- Figure 3 is similar to Figure 1 , but shows the required signals V cap , l P ⁇ m and ground being delivered on outputs 15, 16, and 17 respectively.
- Figure 4 shows how these three signals are processed in accordance with Equation 1 to provide the reconstructed output current Ut-
- the signal V cap is scaled by a capacitive divider and fed to an integrator 18.
- the signal l prim is scaled in an amplifier 19 and the necessary subtraction is carried out in an algebraic summation circuit 20, including an operational amplifier 22, to produce the l ou t signal on line 23.
- Figure 5 is similar to Figure 1 but shows an auxiliary winding 24 associated with the transformer.
- Figure 6 shows an equivalent circuit of the transformer of Figure 5 with leakage inductance modelled at the secondary side.
- leakage inductance modelled at the secondary side In this case:
- a and B are constants depending on the degree of coupling of the auxiliary winding with the primary and secondary windings of the transformer. If Ls aU ⁇ i is very much greater than Ls aU ⁇ 2, the auxiliary winding is coupled to the secondary winding of the transformer. If Ls aux i is very much smaller than Ls auX 2 the auxiliary winding is fully coupled to the primary winding of the transformer.
- the second term on the right-hand side is representative of the magnetising current.
- Figure 7 shows how the signals Vaux and l pnm are processed in accordance with Equation 2 to provide the reconstructed output current l ou t- The V aux signal is fed to an integrator 25 and scaled by factor B.
- the l pr ⁇ m signal is scaled by factor A in an amplifier 26, the outputs of the integrator 25 and amplifier 26 being subtracted in an algebraic summer 27, including an operational amplifier 28, to deliver the Ut signal on line 29.
- the auxiliary winding is not necessarily wound at the secondary (mains isolated) side of the transformer, so that an error due to non-ideal coupling can be corrected by selecting appropriate values for the factors A and B in Equation 2.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
An electrical power converter has a transformer (4) and detecting circuitry for deriving a reconstructed output or load current. In a first aspect of the invention the load current is computed by subtracting a scaled version of the time integral of the primary voltage (Vcap) from a scaled version of the primary current (Iprim). In a second aspect of the invention the load current is computed by subtracting a scaled version of the time integral of the voltage (Vaux) across an auxiliary winding (24) from a scaled version of the primary current (Iprim).
Description
DESCRIPTION
LOAD CURRENT DETECTION IN ELECTRICAL POWER CONVERTERS
This invention relates to the detection of load currents in electrical power converters, particularly resonant converters.
According to one aspect the invention provides an electrical power converter comprising a transformer having a primary circuit and a secondary circuit, the primary circuit being energisable by an AC signal to induce a secondary AC signal across the secondary circuit for delivering a load current, detecting circuitry operative to detect a first electrical signal representative of the current in the primary circuit and a second electrical signal representative of the time integral of the voltage across the primary circuit, scaling circuitry for scaling or proportioning the first electrical signal with respect to the second electrical signal by a scaling factor dependent on the leakage and magnetising inductances of the transformer and computational circuitry for combining the scaled first and second electrical signals so as effectively to subtract the scaled second electrical signal from the scaled first electrical signal to derive a difference signal which is representative of the load current reflected on to the primary side of the transformer and is accordingly representative of the actual load current.
Thus, output or load current reconstruction is possible without the need for an auxiliary winding. This is achieved by determining the difference between the primary current and the time integral of the voltage across the primary winding of the transformer.
According to another aspect the invention provides an electrical power converter comprising a transformer having a primary circuit and a secondary circuit, the primary circuit being energisable by an AC signal to induce a secondary AC signal across the secondary circuit for delivering a load current, detecting circuitry for deriving an electrical signal representative of the load
current, wherein the detecting circuitry comprises a circuit element for deriving a first electrical signal representative of the current in the primary circuit, auxiliary circuitry for deriving a second electrical signal representative of the magnetising current flowing in the transformer and computational circuitry for combining the first and second signals so as effectively to subtract the second signal from the first signal to derive a difference signal which is representative of the load current reflected onto the primary side of the transformer and is accordingly representative of the actual load current, wherein the auxiliary circuitry comprises an auxiliary winding across which an auxiliary voltage is induced and integrating circuitry for integrating the auxiliary voltage with respect to time to derive the second electrical signal and wherein the relative magnitudes of the first and second electrical signals are scaled or proportioned in dependence upon the degree of coupling of the auxiliary winding to the primary and secondary circuits. By means of this aspect, output current reconstruction is possible with an auxiliary winding by computing the difference between the primary current and the time integral of the voltage across the auxiliary winding, with these signals being scaled as appropriate. Thus, the auxiliary winding can be coupled with the primary winding of the transformer, giving the advantage that there is no need for mains isolation for the auxiliary winding.
Embodiments of the invention will now be described, by way of example, with reference to the accompanying drawings, in which: Figure 1 shows a general circuit diagram of a series resonant converter,
Figure 2 shows an equivalent circuit of a transformer of the converter of Figure 1 ,
Figure 3 is a view similar to that of Figure 1 but showing output signals used in the first aspect of the invention, Figure 4 shows how the output signals of Figure 3 are processed,
Figure 5 is similar to Figure 1 but shows an auxiliary winding associated with the transformer of the converter according to the second aspect of the invention,
Figure 6 shows an equivalent circuit of the transformer of Figure 5, and Figure 7 shows how useful output signals from the circuit of Figure 6 are processed.
A general circuit diagram of a series resonant converter is given in Figure 1. The converter comprises circuitry 1 for converting a DC input 2 (marked Vbus) into an AC signal which energises the primary winding 3 of a transformer 4. The induced secondary AC signal across the split secondary winding 5a, 5b of the transformer 4 is rectified by second converter circuitry, including two diodes 6 and 7, into a DC output voltage 8 marked Vout for delivering a load current.
The first converter circuitry induces rectangular profile pulses Gh and Gl in alternate sequence at a controlled frequency. The pulses are fed into a resonant circuit consisting of a capacitor 9, series leakage inductance 10 and magnetising inductance 12 carrying the magnetising current. The transformer 4 is represented as an ideal transformer with a turns ratio of N:1 :1 , being the ratio of turns of the primary winding 3, one half 5a of the split secondary winding and the other half 5b of the split secondary winding. The primary winding 3 and the magnetising inductance 12 are shown in parallel, this parallel arrangement carrying the primary current and being in series with the leakage inductance 10 and the capacitor 9. This parallel arrangement is also in series with a sensing resistor 13 which carries the primary current. Thus, the voltage across the resistor 13 is representative of the primary current.
Figure 2 shows an equivalent circuit of the transformer with leakage inductance modelled at the primary side. The voltage V|m is the voltage Vcap minus the voltage across the inductance 10. Also, the voltage across the inductance 10 is L8 multiplied by the first derivative of the primary current with respect to time, giving the equation:
hut = Ipnm 1 + -^- f Vcapdt - Equation 1 (as herein defined)
^ Lm J Lm J
Figure 3 is similar to Figure 1 , but shows the required signals Vcap, lPπm and ground being delivered on outputs 15, 16, and 17 respectively. Figure 4 shows how these three signals are processed in accordance with Equation 1 to provide the reconstructed output current Ut- The signal Vcap is scaled by a capacitive divider and fed to an integrator 18. The signal lprim is scaled in an amplifier 19 and the necessary subtraction is carried out in an algebraic summation circuit 20, including an operational amplifier 22, to produce the lout signal on line 23.
Figure 5 is similar to Figure 1 but shows an auxiliary winding 24 associated with the transformer.
Figure 6 shows an equivalent circuit of the transformer of Figure 5 with leakage inductance modelled at the secondary side. In this case:
lout = A Ipnm - B ^ Vaux dt - Equation 2 (as herein defined)
where A and B are constants depending on the degree of coupling of the auxiliary winding with the primary and secondary windings of the transformer. If LsaUχi is very much greater than LsaUχ2, the auxiliary winding is coupled to the secondary winding of the transformer. If Lsauxi is very much smaller than LsauX2 the auxiliary winding is fully coupled to the primary winding of the transformer. In Equation 2, the second term on the right-hand side is representative of the magnetising current. Figure 7 shows how the signals Vaux and lpnm are processed in accordance with Equation 2 to provide the reconstructed output current lout- The Vaux signal is fed to an integrator 25 and scaled by factor B. The lprιm signal is scaled by factor A in an amplifier 26, the outputs of the integrator 25 and amplifier 26 being subtracted in an algebraic summer 27, including an operational amplifier 28, to deliver the Ut signal on line 29.
The auxiliary winding is not necessarily wound at the secondary (mains isolated) side of the transformer, so that an error due to non-ideal coupling can be corrected by selecting appropriate values for the factors A and B in Equation 2. From reading the present disclosure, other variations and modifications will be apparent to persons skilled in the art. Such variations and modifications may involve equivalent and other features which are already known in the art, and which may be used instead of or in addition to features already described herein. Although claims have been formulated in this application to particular combinations of features, it should be understood that the scope of the disclosure of the present invention also includes any novel feature or any novel combination of features disclosed herein either explicitly or implicitly or any generalisation thereof, whether or not it relates to the same invention as presently claimed in any claim and whether or not it mitigates any or all of the same technical problems as does the present invention.
Features which are described in the context of separate embodiments may also be provided in combination in a single embodiment. Conversely, various features which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable subcombination. The applicants hereby give notice that new claims may be formulated to such features and/or combinations of such features during the prosecution of the present application or of any further application derived therefrom.
Claims
1. An electrical power converter comprising a transformer (4) having a primary circuit and a secondary circuit, the primary circuit being energisable by an AC signal to induce a secondary AC signal across the secondary circuit for delivering a load current, detecting circuitry operative to detect a first electrical signal (lprim) representative of the current in the primary circuit and a second electrical signal representative of the time integral of the voltage (Vcap) across the primary circuit, scaling circuitry (18,19) for scaling or proportioning the first electrical signal with respect to the second electrical signal by a scaling factor dependent on the leakage and magnetising inductances of the transformer and computational circuitry (22) for combining the scaled first and second electrical signals so as effectively to subtract the scaled second electrical signal from the scaled first electrical signal to derive a difference signal which is representative of the load current reflected on to the primary side of the transformer (4) and is accordingly representative of the actual load current.
2. A converter according to claim 1 , wherein the scaling circuitry is operative to multiply the first and second signals by respective factors in the ratio of 1 + — ^ : — where Ls is the leakage inductance and Lm is the
^ LmJ Lm magnetising inductance.
3. A converter according to claim 1 or 2, wherein the computational circuitry computes the load current in accordance with Equation 1 as hereinbefore defined.
4. An electrical power converter comprising a transformer (4) having a primary circuit (3,12) and a secondary circuit, the primary circuit being energisable by an AC signal to induce a secondary AC signal across the secondary circuit for delivering a load current, detecting circuitry for deriving an electrical signal representative of the load current, wherein the detecting circuitry comprises a circuit element (13) for deriving a first electrical signal representative of the current in the primary circuit (3,12), auxiliary circuitry (24,25) for deriving a second electrical signal representative of the magnetising current flowing in the transformer (4) and computational circuitry (27) for combining the first and second signals so as effectively to subtract the second signal from the first signal to derive a difference signal which is representative of the load current reflected onto the primary side of the transformer (4) and is accordingly representative of the actual load current, wherein the auxiliary circuitry comprises an auxiliary winding across which an auxiliary voltage is induced and integrating circuitry (25) for integrating the auxiliary voltage with respect to time to derive the second electrical signal and wherein the relative magnitudes of the first and second electrical signals are scaled or proportioned in dependence upon the degree of coupling of the auxiliary winding to the primary and secondary circuits.
5. A converter according to claim 4, wherein the computational circuitry calculates the output current in accordance with Equation 2 as hereinbefore defined.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US13/059,411 US8659284B2 (en) | 2008-08-21 | 2009-08-12 | Load current detection in electrical power converters |
| CN2009801321134A CN102124641A (en) | 2008-08-21 | 2009-08-12 | Load Current Sensing in Electric Power Converters |
| EP09786913.5A EP2327143B1 (en) | 2008-08-21 | 2009-08-12 | Load current detection in electrical power converters |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP08105097.3 | 2008-08-21 | ||
| EP08105097 | 2008-08-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2010020909A1 true WO2010020909A1 (en) | 2010-02-25 |
Family
ID=41395488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2009/053555 Ceased WO2010020909A1 (en) | 2008-08-21 | 2009-08-12 | Load current detection in electrical power converters |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US8659284B2 (en) |
| EP (1) | EP2327143B1 (en) |
| CN (1) | CN102124641A (en) |
| WO (1) | WO2010020909A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2458723A1 (en) | 2010-11-24 | 2012-05-30 | Nxp B.V. | A circuit for a resonant converter |
| US20130100706A1 (en) * | 2010-02-08 | 2013-04-25 | Koninklijke Philips Electronics, N.V. | Driver circuit for driving a load circuit |
| AT14262U1 (en) * | 2014-01-13 | 2015-07-15 | Tridonic Gmbh & Co Kg | Driver circuit for lamps, in particular LEDs |
| AT14739U1 (en) * | 2013-08-19 | 2016-05-15 | Tridonic Gmbh & Co Kg | Primary-side controlled constant current converter for lighting equipment |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2010020913A1 (en) * | 2008-08-21 | 2010-02-25 | Nxp B.V. | Electrical power converters and methods of operation |
| DE102016224328A1 (en) * | 2016-12-07 | 2018-06-07 | Tridonic Gmbh & Co Kg | Circuit arrangement and method for operating a light source |
| US11356029B2 (en) * | 2019-07-03 | 2022-06-07 | Rohm Co., Ltd. | Rectifying circuit and switched-mode power supply incorporating rectifying circuit |
| US11695327B2 (en) | 2021-02-25 | 2023-07-04 | Nxp B.V. | Power converter control using current reconstruction of power factor correction inductor current |
| DE102021210752A1 (en) | 2021-09-27 | 2023-03-30 | Mahle International Gmbh | Method for determining a secondary-side load current |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040155639A1 (en) * | 2001-06-29 | 2004-08-12 | Mobers Antonius Maria Gerardus | Current mode controlled switched mode power supply |
| WO2006056928A1 (en) | 2004-11-29 | 2006-06-01 | Philips Intellectual Property & Standards Gmbh | Multi-resonance converter |
| EP2115863A1 (en) * | 2007-02-27 | 2009-11-11 | Nxp B.V. | Load current detection in electrical power converters |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5068776A (en) * | 1990-11-29 | 1991-11-26 | International Business Machines Corporation | Switched-mode DC-DC power converter for reducing effects of magnetization current |
| JP4395881B2 (en) * | 2000-09-06 | 2010-01-13 | Ｔｄｋラムダ株式会社 | Synchronous rectifier circuit for switching power supply |
| US6344979B1 (en) * | 2001-02-09 | 2002-02-05 | Delta Electronics, Inc. | LLC series resonant DC-to-DC converter |
| US6366484B1 (en) * | 2001-10-08 | 2002-04-02 | Broadband Telcom Power, Inc. | Cross current sensing in power conversion |
| JP4085613B2 (en) * | 2001-10-26 | 2008-05-14 | 松下電工株式会社 | Power supply |
| US6958920B2 (en) * | 2003-10-02 | 2005-10-25 | Supertex, Inc. | Switching power converter and method of controlling output voltage thereof using predictive sensing of magnetic flux |
| CN100583615C (en) | 2005-04-01 | 2010-01-20 | Nxp股份有限公司 | Resonant converter and its control device and control method |
| EP1869759B1 (en) | 2005-04-01 | 2019-08-07 | Nxp B.V. | Control of a resonant converter |
| DE102005047548A1 (en) * | 2005-09-30 | 2007-02-15 | Siemens Ag | Measuring load current flowing through inductance, e.g. in cryostats or on rotating shafts, involves determining load current for coil from primary side current of transformer and previously determined magnetizing current of transformer |
| JP4795779B2 (en) * | 2005-11-09 | 2011-10-19 | 株式会社アルバック | Organic electroluminescence display panel |
-
2009
- 2009-08-12 US US13/059,411 patent/US8659284B2/en active Active
- 2009-08-12 CN CN2009801321134A patent/CN102124641A/en active Pending
- 2009-08-12 EP EP09786913.5A patent/EP2327143B1/en active Active
- 2009-08-12 WO PCT/IB2009/053555 patent/WO2010020909A1/en not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040155639A1 (en) * | 2001-06-29 | 2004-08-12 | Mobers Antonius Maria Gerardus | Current mode controlled switched mode power supply |
| WO2006056928A1 (en) | 2004-11-29 | 2006-06-01 | Philips Intellectual Property & Standards Gmbh | Multi-resonance converter |
| EP2115863A1 (en) * | 2007-02-27 | 2009-11-11 | Nxp B.V. | Load current detection in electrical power converters |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130100706A1 (en) * | 2010-02-08 | 2013-04-25 | Koninklijke Philips Electronics, N.V. | Driver circuit for driving a load circuit |
| US9160241B2 (en) * | 2010-02-08 | 2015-10-13 | Koninklijke Philips N.V. | Driver circuit for driving a load circuit |
| EP2458723A1 (en) | 2010-11-24 | 2012-05-30 | Nxp B.V. | A circuit for a resonant converter |
| US8811040B2 (en) | 2010-11-24 | 2014-08-19 | Nxp B.V. | Circuit for a resonant converter |
| AT14739U1 (en) * | 2013-08-19 | 2016-05-15 | Tridonic Gmbh & Co Kg | Primary-side controlled constant current converter for lighting equipment |
| AT14262U1 (en) * | 2014-01-13 | 2015-07-15 | Tridonic Gmbh & Co Kg | Driver circuit for lamps, in particular LEDs |
Also Published As
| Publication number | Publication date |
|---|---|
| US20110133722A1 (en) | 2011-06-09 |
| US8659284B2 (en) | 2014-02-25 |
| EP2327143B1 (en) | 2017-04-05 |
| EP2327143A1 (en) | 2011-06-01 |
| CN102124641A (en) | 2011-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2010020909A1 (en) | Load current detection in electrical power converters | |
| US8199534B2 (en) | Load current detection in electrical power converters | |
| US11005378B2 (en) | Operating a flyback converter using a signal indicative of a resonant tank current of the flyback converter | |
| EP2333944B1 (en) | Current detecting circuit and transformer current measuring system | |
| US20160197545A1 (en) | Current detector and power conversion device | |
| US20120313646A1 (en) | Current estimation circuit | |
| US8611110B2 (en) | Switching power supply apparatus | |
| US20100165671A1 (en) | Switched-mode Power Supplies | |
| CN114070034B (en) | Power conversion device | |
| WO2010020913A1 (en) | Electrical power converters and methods of operation | |
| US5668708A (en) | DC power supply with reduced ripple | |
| US11979084B2 (en) | Active clamp DC/DC converter including current sense peak control mode control | |
| JP2003244953A (en) | Dc-dc converter | |
| EP0680134B1 (en) | Apparatus for controlling converter having self-arc-extinction elements | |
| JP4831010B2 (en) | Transformer current detection circuit | |
| US6366484B1 (en) | Cross current sensing in power conversion | |
| US11442092B2 (en) | Power conversion device and method for detecting magnetic saturation of common-mode reactor | |
| US11901825B2 (en) | Isolated DC-DC converter | |
| JPH10221397A (en) | Leakage current detector | |
| EP4618393A1 (en) | A resonant converter | |
| TWI611644B (en) | Overcurrent protection circuit | |
| JP4917337B2 (en) | Converter with multiple channels | |
| JP3401923B2 (en) | One-stone current complex resonance type converter circuit | |
| KR20140142048A (en) | Ground fault detecting circuit for inverter | |
| JPS595867B2 (en) | AC amount detection device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WWE | Wipo information: entry into national phase |
Ref document number: 200980132113.4 Country of ref document: CN |
|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09786913 Country of ref document: EP Kind code of ref document: A1 |
|
| REEP | Request for entry into the european phase |
Ref document number: 2009786913 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 2009786913 Country of ref document: EP |
|
| WWE | Wipo information: entry into national phase |
Ref document number: 13059411 Country of ref document: US |
|
| NENP | Non-entry into the national phase |
Ref country code: DE |