WO2012089707A2 - An induction heating cooker - Google Patents

An induction heating cooker Download PDF

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Publication number
WO2012089707A2
WO2012089707A2 PCT/EP2011/074049 EP2011074049W WO2012089707A2 WO 2012089707 A2 WO2012089707 A2 WO 2012089707A2 EP 2011074049 W EP2011074049 W EP 2011074049W WO 2012089707 A2 WO2012089707 A2 WO 2012089707A2
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WO
WIPO (PCT)
Prior art keywords
voltage
heating cooker
induction coil
induction heating
additional
Prior art date
Application number
PCT/EP2011/074049
Other languages
French (fr)
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WO2012089707A3 (en
Inventor
Metin OZTURK
Namik Yilmaz
Original Assignee
Arcelik Anonim Sirketi
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arcelik Anonim Sirketi filed Critical Arcelik Anonim Sirketi
Priority to EP11802755.6A priority Critical patent/EP2659733B1/en
Publication of WO2012089707A2 publication Critical patent/WO2012089707A2/en
Publication of WO2012089707A3 publication Critical patent/WO2012089707A3/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B6/00—Heating by electric, magnetic or electromagnetic fields
    • H05B6/02—Induction heating
    • H05B6/06—Control, e.g. of temperature, of power
    • H05B6/062—Control, e.g. of temperature, of power for cooking plates or the like

Definitions

  • the present invention relates to an induction heating cooker comprising the electronic elements that carry high current.
  • the induction heating cooker functions according to the principle of heating a cast iron or steel ferromagnetic cooking container with the magnetic field effect generated by the induction coil.
  • the energy efficiency of induction heating cookers is considerably high since the heat required for cooking is not generated in the gas or electric burners on the cooker but directly in the cooking container.
  • high amount of electric current is conducted through electronic switching elements like the power switch (IGBT-Insulated Gate Bipolar Transistor or Mosfet) and the diode bridge on the circuit board.
  • the quasi resonant converter circuit realized by one IGBT and one resonant capacitor that provides cost advantage is used besides the half bridge series resonant converter realized by using two switches and two resonant capacitors.
  • the resonant capacitor is connected in parallel with the induction coil in contrast to the half bridge series resonant converter circuit wherein the induction coils and the resonant capacitors are connected in series.
  • One end of the IGBT switch is connected in series to one end of the parallel connected coil and capacitor and the other end is connected to the reference output point of the rectified voltage.
  • This structure that is connected in series is connected to the intermediate circuit voltage.
  • the disadvantage of this drive circuit is that it can work in narrower power frequency range and the maximum value thereof is limited.
  • the basic parameter limiting the operating range is that in low load conditions, the voltage occurring on the switch during switching does not to fall to zero and results in high losses on the switches and the drawing of high value capacitor charge currents in the IGBT switch.
  • the transmission operating conditions in the quasi resonant structure having low cost single IGBT and single resonant capacitor is determined largely by the load itself.
  • the control and switching electronics are expected to energize the load at suitable moments.
  • the aim of the present invention is the realization of an induction heating cooker wherein the power losses are decreased.
  • the induction heating cooker realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises at least one additional capacitor parallel to the resonant capacitor and the induction coil connected parallel to each other.
  • the induction coil is provided to operate in a wide power range by activating or deactivating the additional capacitor by the control unit.
  • the additional capacitor When the voltage passing through the induction coil gets near the upper limit, the additional capacitor is activated by the control unit and provides the induction coil to be able to operate at higher power level. When the voltage passing through the induction coil gets near the lower limit, the additional capacitor is deactivated by the control unit, thereby providing the induction coil to operate at lower power level.
  • the induction heating cooker comprises two additional capacitors and the induction coil is operated at three different levels.
  • the resonant capacitor is conducting at all levels. In the high power level, both of the additional capacitors are conducting. In the middle power level only one of the additional capacitors is conducting.
  • the operating range of the induction coil and the highest and lowest power levels of usability are increased by making the total capacity value of the capacitors connected parallel to the induction coil variable.
  • Figure 1 – is the schematic view of an induction heating cooker.
  • the induction heating cooker (1) comprises a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7).
  • the induction heating cooker (1) comprises at least one additional capacitor (8, 108) connected in parallel to the induction coil (7).
  • the induction heating cooker (1) furthermore comprises a voltage detecting circuit (10), one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K) and a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (Va) prerecorded in its memory by the producer, that activates or deactivates the additional capacitors (8, 108) if the voltage (V1) at the collector point (K) is around the voltage upper limit value (Vu) and the voltage lower limit value (Va).
  • a voltage detecting circuit (10) one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K)
  • a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (V
  • the induction coil (7) can be operated at different power levels by an adjustment means (not shown in the figures) that is actuated by the user.
  • the induction heating cooker (1) furthermore comprises a switch (9, 109) that is connected in series to each additional capacitor (8, 108).
  • the control unit (11) activates at least one of the switches (9, 109) and provides current to be conducted through at least one of the additional capacitors (8, 108).
  • the total capacity value increases and the induction coil (7) can be driven at high power level since the additional capacitor (8, 108) that starts conducting and the resonant capacitor (6) are connected in parallel.
  • the control unit (11) provides to cut off the current conducted through at least one of the additional capacitors (8, 108) by deactivating at least one of the switches (9, 109).
  • the total capacity value decreases and the induction coil (7) can be operated at low power level since the switched off additional capacitor (8, 108) and the resonant capacitor (6) are connected in parallel.
  • the induction heating cooker (1) comprises a current detecting circuit (12) that measures the current at the output of the power switch (5) and a power switch drive circuit (13) that activates or deactivates the power switch (5).
  • the current detecting circuit (12) detects the momentary peaks in the current (I) when the voltage (V1) measured at the collector point (K) reaches the voltage lower limit value (Va) if the induction coil (7) is driven at low power level.
  • the current detecting circuit (12) transmits the detected momentary current (I) peaks to the control unit (11).
  • the control unit (11) deactivates the additional capacitors (8, 108) at the momentary current (I) peaks.
  • the induction heating cooker (1) comprises two additional capacitors (8, 108) and two switches (9, 109).
  • the induction coil (7) is operated at three different levels (A1, A2, A3) and at three different power scales at each level (A1, A2, A3), in total nine different power scales by means of an adjustment means (not shown in the figures) that is actuated by the user .
  • Only the resonant capacitor (6) is activated while the induction coil (7) is operated at low power level (A1).
  • the control unit (11) does not activate the additional capacitors (8, 108).
  • the resonant capacitor (6) and the first additional capacitor (8) are conducting while the induction coil (7) is operated at middle power level (A2).
  • the control unit (11) does not activate the other additional capacitor (108).
  • the resonant capacitor (6) and the additional capacitors (8, 108) are conducting while the induction coil (7) is operated at high power level (A3).
  • the induction coil (7) is provided to be driven electrically safely and in a wide range of power by means of activating or deactivating the additional capacitors (8, 108) connected in parallel to the induction coil (7) by the control unit (11) depending on the power value whereat the induction coil (7) is operated.
  • the additional capacitors (8, 108) connected parallel to the resonant capacitor (6) passing of momentary high voltage through the power switch (5) and damaging of the power switch (5) are prevented.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Induction Heating Cooking Devices (AREA)

Abstract

The present invention relates to an induction heating cooker (1) that comprises a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7).

Description

AN INDUCTION HEATING COOKER
The present invention relates to an induction heating cooker comprising the electronic elements that carry high current.
The induction heating cooker functions according to the principle of heating a cast iron or steel ferromagnetic cooking container with the magnetic field effect generated by the induction coil. The energy efficiency of induction heating cookers is considerably high since the heat required for cooking is not generated in the gas or electric burners on the cooker but directly in the cooking container. In order to drive the induction coils generating magnetic field, high amount of electric current is conducted through electronic switching elements like the power switch (IGBT-Insulated Gate Bipolar Transistor or Mosfet) and the diode bridge on the circuit board. In the state of the art, for driving the induction coils, the quasi resonant converter circuit realized by one IGBT and one resonant capacitor that provides cost advantage is used besides the half bridge series resonant converter realized by using two switches and two resonant capacitors. In this circuit, the resonant capacitor is connected in parallel with the induction coil in contrast to the half bridge series resonant converter circuit wherein the induction coils and the resonant capacitors are connected in series. One end of the IGBT switch is connected in series to one end of the parallel connected coil and capacitor and the other end is connected to the reference output point of the rectified voltage. This structure that is connected in series is connected to the intermediate circuit voltage. The disadvantage of this drive circuit is that it can work in narrower power frequency range and the maximum value thereof is limited. The basic parameter limiting the operating range is that in low load conditions, the voltage occurring on the switch during switching does not to fall to zero and results in high losses on the switches and the drawing of high value capacitor charge currents in the IGBT switch. The transmission operating conditions in the quasi resonant structure having low cost single IGBT and single resonant capacitor is determined largely by the load itself. The control and switching electronics are expected to energize the load at suitable moments.
In the state of the art European Patent No. EP 0 888 033 B1, the control circuit and the control method used in an induction heating cooker is explained.
The aim of the present invention is the realization of an induction heating cooker wherein the power losses are decreased.
The induction heating cooker realized in order to attain the aim of the present invention, explicated in the first claim and the respective claims thereof, comprises at least one additional capacitor parallel to the resonant capacitor and the induction coil connected parallel to each other. The induction coil is provided to operate in a wide power range by activating or deactivating the additional capacitor by the control unit.
When the voltage passing through the induction coil gets near the upper limit, the additional capacitor is activated by the control unit and provides the induction coil to be able to operate at higher power level. When the voltage passing through the induction coil gets near the lower limit, the additional capacitor is deactivated by the control unit, thereby providing the induction coil to operate at lower power level.
In an embodiment of the present invention, the induction heating cooker comprises two additional capacitors and the induction coil is operated at three different levels. The resonant capacitor is conducting at all levels. In the high power level, both of the additional capacitors are conducting. In the middle power level only one of the additional capacitors is conducting.
In the induction heating cooker, the operating range of the induction coil and the highest and lowest power levels of usability are increased by making the total capacity value of the capacitors connected parallel to the induction coil variable.
The induction heating cooker realized in order to attain the aim of the present invention is illustrated in the attached figures, where:
Figure 1 – is the schematic view of an induction heating cooker.
The elements illustrated in the figures are numbered as follows:
  1. Induction heating cooker
  2. Mains filtering circuit
  3. Diode bridge rectifier
  4. Filtering circuit
  5. Power switch
  6. Resonant capacitor
  7. Induction coil
  8. , 108. Additional capacitor
  9. , 109. Switch
  10. Voltage detecting circuit
  11. Control unit
  12. Current detecting circuit
  13. Power switch drive circuit
The induction heating cooker (1) comprises a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7).
The induction heating cooker (1) comprises at least one additional capacitor (8, 108) connected in parallel to the induction coil (7).
The induction heating cooker (1) furthermore comprises a voltage detecting circuit (10), one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K) and a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (Va) prerecorded in its memory by the producer, that activates or deactivates the additional capacitors (8, 108) if the voltage (V1) at the collector point (K) is around the voltage upper limit value (Vu) and the voltage lower limit value (Va).
As the conducting time of the power switch (5) increases, the amount of energy delivered to the induction coil (7) increases in direct proportion. The induction coil (7) can be operated at different power levels by an adjustment means (not shown in the figures) that is actuated by the user.
The induction heating cooker (1) furthermore comprises a switch (9, 109) that is connected in series to each additional capacitor (8, 108).
If the user drives the induction coil (7) at high power level, the voltage (V1) measured at the collector point (K) gets closer to the voltage upper limit value (Vu). In this case, the control unit (11) activates at least one of the switches (9, 109) and provides current to be conducted through at least one of the additional capacitors (8, 108). The total capacity value increases and the induction coil (7) can be driven at high power level since the additional capacitor (8, 108) that starts conducting and the resonant capacitor (6) are connected in parallel.
If the user drives the induction coil (7) at low power level, the voltage (V1) measured at the collector point (K) gets closer to the voltage lower limit value (Va). In this case, the control unit (11) provides to cut off the current conducted through at least one of the additional capacitors (8, 108) by deactivating at least one of the switches (9, 109). The total capacity value decreases and the induction coil (7) can be operated at low power level since the switched off additional capacitor (8, 108) and the resonant capacitor (6) are connected in parallel.
In an embodiment of the present invention, the induction heating cooker (1) comprises a current detecting circuit (12) that measures the current at the output of the power switch (5) and a power switch drive circuit (13) that activates or deactivates the power switch (5). The current detecting circuit (12) detects the momentary peaks in the current (I) when the voltage (V1) measured at the collector point (K) reaches the voltage lower limit value (Va) if the induction coil (7) is driven at low power level. The current detecting circuit (12) transmits the detected momentary current (I) peaks to the control unit (11). The control unit (11) deactivates the additional capacitors (8, 108) at the momentary current (I) peaks.
In an embodiment of the present invention, the induction heating cooker (1) comprises two additional capacitors (8, 108) and two switches (9, 109). The induction coil (7) is operated at three different levels (A1, A2, A3) and at three different power scales at each level (A1, A2, A3), in total nine different power scales by means of an adjustment means (not shown in the figures) that is actuated by the user . Only the resonant capacitor (6) is activated while the induction coil (7) is operated at low power level (A1). The control unit (11) does not activate the additional capacitors (8, 108). The resonant capacitor (6) and the first additional capacitor (8) are conducting while the induction coil (7) is operated at middle power level (A2). The control unit (11) does not activate the other additional capacitor (108). The resonant capacitor (6) and the additional capacitors (8, 108) are conducting while the induction coil (7) is operated at high power level (A3).
In the induction heating cooker (1), the induction coil (7) is provided to be driven electrically safely and in a wide range of power by means of activating or deactivating the additional capacitors (8, 108) connected in parallel to the induction coil (7) by the control unit (11) depending on the power value whereat the induction coil (7) is operated. By means of the additional capacitors (8, 108) connected parallel to the resonant capacitor (6), passing of momentary high voltage through the power switch (5) and damaging of the power switch (5) are prevented.
It is to be understood that the present invention is not limited by the embodiments disclosed above and a person skilled in the art can easily introduce different embodiments. These should be considered within the scope of the protection postulated by the claims of the present invention.

Claims (7)

  1. An induction heating cooker (1) comprising a mains filtering circuit (2), a diode bridge rectifier (3) providing the alternative current received from the mains to be converted to direct current, a filtering circuit (4) that cleans the voltage signal delivered by the diode bridge rectifier (3) from high frequency noises, a power switch (5) that drives the voltage received from the filtering circuit (4) to high frequency voltage, an induction coil (7) connected in series to the end of the power switch (5), providing the ferromagnetic cooking container placed thereon to be heated with the magnetic field generated and a resonant capacitor (6) connected parallel to the induction coil (7), characterized by at least one additional capacitor (8, 108) that is connected parallel to the induction coil (7).
  2. An induction heating cooker (1) as in Claim 1, characterized by a voltage detecting circuit (10), one end connected to the collector point (K) prior to the power switch (5) and that measures the voltage (V1) at the collector point (K) and a control unit (11) that compares the voltage (V1) at the collector point (K) measured by the voltage detecting circuit (10) with the voltage upper limit value (Vu) and the voltage lower limit value (Va) prerecorded in its memory by the producer, that activates or deactivates the additional capacitors (8, 108) if the voltage (V1) at the collector point (K) is around the voltage upper limit value (Vu) and the voltage lower limit value (Va).
  3. An induction heating cooker (1) as in Claim 1 or 2, characterized by a switch (9, 109) that is connected in series to each additional capacitor (8, 108).
  4. An induction heating cooker (1) as in Claim 3, characterized by the control unit (11) that activates at least one of the switches (9, 109) and provides current to be conducted through at least one of the additional capacitors (8, 108) when the voltage (V1) measured at the collector point (K) gets closer to the voltage upper limit value (Vu).
  5. An induction heating cooker (1) as in Claim 3 or 4, characterized by the control unit (11) that deactivates at least one of the switches (9, 109) and provides to cut off the current conducted through at least one of the additional capacitors (8, 108) when the voltage (V1) measured at the collector point (K) gets closer to the voltage lower limit value (Va).
  6. An induction heating cooker (1) as in any one of the Claims 2 to 5, characterized by two additional capacitors (8, 108) and two switches (9, 109) and the induction coil (7) that is operated at three different levels (A1, A2, A3) and at three different power scales at each level (A1, A2, A3), in total nine different power scales.
  7. An induction heating cooker (1) as in Claim 6, characterized by the control unit (11) that activates only the resonant capacitor (6), not activating the additional capacitors (8, 108) while the induction coil (7) is operated at low power level (A1), that activates the resonant capacitor (6) and the first additional capacitor (8), not activating the other additional capacitor (108) while the induction coil (7) is operated at middle power level (A2), and that activates the resonant capacitor (6) and the additional capacitors (8, 108) while the induction coil (7) is operated at high power level (A3).
PCT/EP2011/074049 2010-12-31 2011-12-26 An induction heating cooker WO2012089707A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP11802755.6A EP2659733B1 (en) 2010-12-31 2011-12-26 An induction heating cooker

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR201011265 2010-12-31
TRA2010/11265 2010-12-31

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Publication Number Publication Date
WO2012089707A2 true WO2012089707A2 (en) 2012-07-05
WO2012089707A3 WO2012089707A3 (en) 2013-02-07

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2744299A1 (en) * 2012-12-11 2014-06-18 BSH Bosch und Siemens Hausgeräte GmbH Induction heating device for household appliances
US9212591B2 (en) 2012-12-31 2015-12-15 Continental Automotive Systems, Inc. Using resistance equivalent to estimate heater temperature of an exhaust gas after-treatment component
WO2016015971A1 (en) * 2014-07-31 2016-02-04 E.G.O. Elektro-Gerätebau GmbH Induction heating system
US9285403B2 (en) 2012-12-31 2016-03-15 Continental Automotive Systems, Inc Resistance determination for temperature control of heated automotive components
US9334843B2 (en) 2012-12-31 2016-05-10 Continental Automotive Systems, Inc. Using resistance equivalent to estimate temperature of a fuel-injector heater
US9618947B2 (en) 2012-12-31 2017-04-11 Continental Automotive Systems, Inc. Resistance determination with increased sensitivity for temperature control of heated automotive components
EP3836753A1 (en) * 2019-12-13 2021-06-16 Electrolux Appliances Aktiebolag Method and system to control a qr-inverter in a induction cooking appliance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106136933B (en) * 2015-04-07 2018-09-11 佛山市顺德区美的电热电器制造有限公司 Cooking apparatus and electric heater unit for cooking apparatus

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467165A (en) * 1979-09-17 1984-08-21 Matsushita Electric Industrial Co., Ltd. Induction heating apparatus
EP0235578A2 (en) * 1986-03-05 1987-09-09 AEG-Elotherm GmbH Current supply device for a load formed with parallel oscillating circuits mounted individually in parallel on a bus bar
FR2773014A1 (en) * 1997-12-23 1999-06-25 Europ Equip Menager DEVICE FOR SUPPLYING MULTIPLE RESONANT CIRCUITS BY AN INVERTER POWER GENERATOR
US6018154A (en) * 1996-03-13 2000-01-25 Matsushita Electric Industrial Co., Ltd. High-frequency inverter and induction cooking device using the same

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4467165A (en) * 1979-09-17 1984-08-21 Matsushita Electric Industrial Co., Ltd. Induction heating apparatus
EP0235578A2 (en) * 1986-03-05 1987-09-09 AEG-Elotherm GmbH Current supply device for a load formed with parallel oscillating circuits mounted individually in parallel on a bus bar
US6018154A (en) * 1996-03-13 2000-01-25 Matsushita Electric Industrial Co., Ltd. High-frequency inverter and induction cooking device using the same
FR2773014A1 (en) * 1997-12-23 1999-06-25 Europ Equip Menager DEVICE FOR SUPPLYING MULTIPLE RESONANT CIRCUITS BY AN INVERTER POWER GENERATOR

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2744299A1 (en) * 2012-12-11 2014-06-18 BSH Bosch und Siemens Hausgeräte GmbH Induction heating device for household appliances
US9212591B2 (en) 2012-12-31 2015-12-15 Continental Automotive Systems, Inc. Using resistance equivalent to estimate heater temperature of an exhaust gas after-treatment component
US9285403B2 (en) 2012-12-31 2016-03-15 Continental Automotive Systems, Inc Resistance determination for temperature control of heated automotive components
US9334843B2 (en) 2012-12-31 2016-05-10 Continental Automotive Systems, Inc. Using resistance equivalent to estimate temperature of a fuel-injector heater
US9618947B2 (en) 2012-12-31 2017-04-11 Continental Automotive Systems, Inc. Resistance determination with increased sensitivity for temperature control of heated automotive components
WO2016015971A1 (en) * 2014-07-31 2016-02-04 E.G.O. Elektro-Gerätebau GmbH Induction heating system
EP3836753A1 (en) * 2019-12-13 2021-06-16 Electrolux Appliances Aktiebolag Method and system to control a qr-inverter in a induction cooking appliance
WO2021115809A1 (en) * 2019-12-13 2021-06-17 Electrolux Appliances Aktiebolag Method and system to control a qr-inverter in a induction cooking appliance

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WO2012089707A3 (en) 2013-02-07
EP2659733A2 (en) 2013-11-06

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