WO2019096538A1 - A supply circuit - Google Patents

A supply circuit Download PDF

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Publication number
WO2019096538A1
WO2019096538A1 PCT/EP2018/078674 EP2018078674W WO2019096538A1 WO 2019096538 A1 WO2019096538 A1 WO 2019096538A1 EP 2018078674 W EP2018078674 W EP 2018078674W WO 2019096538 A1 WO2019096538 A1 WO 2019096538A1
Authority
WO
WIPO (PCT)
Prior art keywords
supply circuit
transformer
enabling
power
primary coil
Prior art date
Application number
PCT/EP2018/078674
Other languages
French (fr)
Inventor
Sezgi YIKILMAZCINAR
Serdal Elmas
Nurdan TURKER
Ahmet Ihsan Yuce
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
Publication of WO2019096538A1 publication Critical patent/WO2019096538A1/en

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Classifications

    • 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
    • H05B6/64—Heating using microwaves
    • H05B6/66—Circuits
    • H05B6/662—Aspects related to the boost transformer of the microwave heating apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F29/00—Variable transformers or inductances not covered by group H01F21/00
    • H01F29/02—Variable transformers or inductances not covered by group H01F21/00 with tappings on coil or winding; with provision for rearrangement or interconnection of windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F38/00—Adaptations of transformers or inductances for specific applications or functions
    • H01F2038/003—High frequency transformer for microwave oven
    • 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
    • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

  • the present invention relates to a supply circuit enabling supplying power in particular to microwave ovens.
  • Microwave ovens enable heating food products very rapidly compared to conventional appliances such as ovens or cooking ranges.
  • the microwaves are generated by a component called magnetron.
  • a magnetron basically consists of a filament enabling thermionic electron emission, and a resonance cavity in which the electrons emitted from the filament are accelerated. The electrons accelerated to a certain velocity in the resonance cavity, depart from the magnetron, reaching the food product desired to be heated. These two separate parts of the magnetron are supplied power in separate manners.
  • the heating capacity of microwave ovens vary with the power supplied to the resonance cavity.
  • microwave ovens In microwave ovens, they are two types of supply circuits, namely linear transformer and inverter types. In models with an inverter, power is adjusted by directly varying the supply voltage. In microwave ovens with a transformer, which are more common and less expensive, the power supplied to the magnetron is turned on and off in certain intervals to adjust power.
  • the on/off power adjustment method used in microwave ovens with a transformer which transmit full power for a given time to the food product and then rest for a given time, cause formation of excessively hot spots on the food product and non-homogeneous cooking.
  • the aim of the present invention is to realize a supply circuit enabling supplying power in particular to microwave ovens.
  • Another aim of the present invention is to realize a transformer type supply circuit with adjustable power output.
  • Figure 1 is a view of an embodiment of the power circuit.
  • Figure 2 is a view of another embodiment of the power circuit.
  • the supply circuit (1) enabling supplying power in particular to microwave ovens, comprises - at least one transformer (2) enabling a supply voltage to be transformed to a required level, having - at least one primary coil (3) supplied by a power supply, thereby enabling generating a magnetic flux, and - at least one secondary coil (4) generating an output current in accordance with the magnetic flux generated by the primary coil (3), - wherein, at least one of the primary coil (3) and the secondary coil (4) of the transformer (2) has multiple steps.
  • the supply circuit (1) enabling supplying power in particular to microwave ovens, comprises at least one transformer (2) enabling a supply voltage to be transformed to a required level.
  • the transformer (2) comprises at least one primary coil (3) supplied by a power supply, thereby enabling generating a magnetic flux.
  • Said power supply may be mains voltage or an alternative current supply. What matters here is that the supply voltage is not constant. Because if the supply voltage is constant, then the magnetic flux generated by the primary coil (3) will also be constant. In this case, a short time peak will be observed in the output of the secondary coil (4), and then the output of the secondary coil (4) will be at zero level.
  • the primary coil (3) is supplied by using an alternative current supply, then the generated magnetic flux will continuously change and this varying magnetic flux will enable the secondary coil (4) to generate a continuous power output.
  • At least one of the primary coil (3) and the secondary coil (4) of the transformer (2) has multiple steps.
  • each parallel coil is referred to as a step.
  • each output with a different number of windings is referred to as a step.
  • the supply circuit (1) of the invention has two basic embodiments, namely a primary coil (3) with multiple steps and a secondary coil (4) with multiple steps.
  • the transformer (2) comprises a primary coil (3) with multiple steps ( Figure 1).
  • at least one of said steps comprises at least one switch (5) enabling or disabling activation of said step.
  • the higher number of activated steps enable generating the higher amount of magnetic flux, and therefore the higher amount of output power.
  • one, a few or all of the switches (5) shown in Figure 1 as RL1, RL2 and RL3, are turned off.
  • the transformer (2) comprises a secondary coil (4) with multiple steps ( Figure 2).
  • at least one of said steps comprises at least one switch (5) enabling or disabling activation of said step.
  • steps correspond to different number of windings.
  • the step with a higher number of windings has a higher power output.
  • the case with the highest power output is the one in which all of the switches (5) shown in Figure 2 as RL1, RL2 and RL3, are turned on.
  • the output power decreases to an extent if RL1 switch (5) is turned off, the output power decreases some more if the RL2 switch (5) is turned off, and the output power further decreases if RL3 switch (5) is turned off.
  • each switch (5) short circuits at least a portion of the secondary coil (4), reducing the number of active windings.
  • the switch (5) is an electrically controllable switch.
  • the switch (5) may also be a relay.
  • the transformer (2) comprises a separate secondary coil (4) to supply the filament of a magnetron.
  • the amount of power to be supplied to a magnetron according to the requirement of the food product desired to be heated in a microwave oven can be varied by using a transformer (2) which is less expensive compared to an inverter.
  • a transformer (2) which is less expensive compared to an inverter.

Abstract

The present invention relates to a transformer type supply circuit (1) with adjustable power output, enabling supplying power in particular to microwave ovens. In its most basic form, the supply circuit (1) is characterized by a transformer (2) at least one of whose primary coil (3) and the secondary coil (4) has a plurality of steps.

Description

A SUPPLY CIRCUIT
Technical Field
The present invention relates to a supply circuit enabling supplying power in particular to microwave ovens.
Prior Art
Microwave ovens enable heating food products very rapidly compared to conventional appliances such as ovens or cooking ranges. In microwave ovens, the microwaves are generated by a component called magnetron. A magnetron basically consists of a filament enabling thermionic electron emission, and a resonance cavity in which the electrons emitted from the filament are accelerated. The electrons accelerated to a certain velocity in the resonance cavity, depart from the magnetron, reaching the food product desired to be heated. These two separate parts of the magnetron are supplied power in separate manners. The heating capacity of microwave ovens vary with the power supplied to the resonance cavity.
In microwave ovens, they are two types of supply circuits, namely linear transformer and inverter types. In models with an inverter, power is adjusted by directly varying the supply voltage. In microwave ovens with a transformer, which are more common and less expensive, the power supplied to the magnetron is turned on and off in certain intervals to adjust power.
The on/off power adjustment method used in microwave ovens with a transformer, which transmit full power for a given time to the food product and then rest for a given time, cause formation of excessively hot spots on the food product and non-homogeneous cooking.
State of the art United States patent document no. US5082998 mentions a switching power supply enabling adjusting the power output of a magnetron.
None of the state of the art documents include a solution such as the one in the present invention.
Brief Description of the Invention
The aim of the present invention is to realize a supply circuit enabling supplying power in particular to microwave ovens.
Another aim of the present invention is to realize a transformer type supply circuit with adjustable power output.
Detailed Description of the Invention
The supply circuit realized to achieve the aim of the present invention is illustrated in the accompanying drawing, wherein:
Figure 1: is a view of an embodiment of the power circuit.
Figure 2: is a view of another embodiment of the power circuit.
The elements in the figures are numbered individually and the correspondence of these numbers are given hereinafter.
  1. Power circuit
  2. Transformer
  3. Primary coil
  4. Secondary coil
  5. Switch
    Y. Load
In its most basic form, the supply circuit (1) enabling supplying power in particular to microwave ovens, comprises
- at least one transformer (2) enabling a supply voltage to be transformed to a required level, having
- at least one primary coil (3) supplied by a power supply, thereby enabling generating a magnetic flux, and
- at least one secondary coil (4) generating an output current in accordance with the magnetic flux generated by the primary coil (3),
- wherein, at least one of the primary coil (3) and the secondary coil (4) of the transformer (2) has multiple steps.
In its most basic form, the supply circuit (1) enabling supplying power in particular to microwave ovens, comprises at least one transformer (2) enabling a supply voltage to be transformed to a required level. The transformer (2) comprises at least one primary coil (3) supplied by a power supply, thereby enabling generating a magnetic flux. Said power supply may be mains voltage or an alternative current supply. What matters here is that the supply voltage is not constant. Because if the supply voltage is constant, then the magnetic flux generated by the primary coil (3) will also be constant. In this case, a short time peak will be observed in the output of the secondary coil (4), and then the output of the secondary coil (4) will be at zero level. However, if the primary coil (3) is supplied by using an alternative current supply, then the generated magnetic flux will continuously change and this varying magnetic flux will enable the secondary coil (4) to generate a continuous power output. At least one of the primary coil (3) and the secondary coil (4) of the transformer (2) has multiple steps.
For the primary coil (3), each parallel coil is referred to as a step. For the secondary coil (4), each output with a different number of windings is referred to as a step.
The supply circuit (1) of the invention has two basic embodiments, namely a primary coil (3) with multiple steps and a secondary coil (4) with multiple steps.
In an embodiment of the invention, the transformer (2) comprises a primary coil (3) with multiple steps (Figure 1). In this embodiment, at least one of said steps comprises at least one switch (5) enabling or disabling activation of said step. In this embodiment, the higher number of activated steps enable generating the higher amount of magnetic flux, and therefore the higher amount of output power. In order to increase the output power, one, a few or all of the switches (5) shown in Figure 1 as RL1, RL2 and RL3, are turned off.
In an embodiment of the invention, the transformer (2) comprises a secondary coil (4) with multiple steps (Figure 2). In this embodiment, at least one of said steps comprises at least one switch (5) enabling or disabling activation of said step. In this embodiment, steps correspond to different number of windings. The step with a higher number of windings has a higher power output. The case with the highest power output is the one in which all of the switches (5) shown in Figure 2 as RL1, RL2 and RL3, are turned on. For example, the output power decreases to an extent if RL1 switch (5) is turned off, the output power decreases some more if the RL2 switch (5) is turned off, and the output power further decreases if RL3 switch (5) is turned off. In this embodiment, each switch (5) short circuits at least a portion of the secondary coil (4), reducing the number of active windings.
In the preferred embodiment of the invention, the switch (5) is an electrically controllable switch. In this embodiment, the switch (5) may also be a relay.
In an embodiment of the invention, the transformer (2) comprises a separate secondary coil (4) to supply the filament of a magnetron.
By means of the supply circuit (1) of the invention, the amount of power to be supplied to a magnetron according to the requirement of the food product desired to be heated in a microwave oven, can be varied by using a transformer (2) which is less expensive compared to an inverter. Thus, food products are enabled to be heated in varying powers without causing problems such as formation of excessively hot spots on the food product in on/off switching.

Claims (6)

  1. A supply circuit (1) enabling supplying power in particular to microwave ovens, comprising
    - at least one transformer (2) enabling a supply voltage to be transformed to a required level, having
    - at least one primary coil (3) supplied by a power supply, thereby enabling generating a magnetic flux, and
    - at least one secondary coil (4) generating an output current in accordance with the magnetic flux generated by the primary coil (3),
    - characterized in that at least one of the primary coil (3) and the secondary coil (4) of the transformer (2) has multiple steps.
  2. A supply circuit (1) according to claim 1, comprising a transformer (2) having a primary coil (3) with multiple steps.
  3. A supply circuit (1) according to claim 2, comprising at least one switch (5) enabling or disabling activation of at least one step.
  4. A supply circuit (1) according to claim 1, comprising a transformer (2) having a secondary coil (4) with multiple steps.
  5. A supply circuit (1) according to claim 4, comprising at least one switch (5) enabling or disabling activation of at least one step.
  6. A supply circuit (1) according to any one of the claims 3 or 5, comprising an electrically controllable switch (5).
PCT/EP2018/078674 2017-11-16 2018-10-19 A supply circuit WO2019096538A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TRA2017/18128 2017-11-16
TR2017/18128A TR201718128A2 (en) 2017-11-16 2017-11-16 ONE FEED CIRCUIT

Publications (1)

Publication Number Publication Date
WO2019096538A1 true WO2019096538A1 (en) 2019-05-23

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PCT/EP2018/078674 WO2019096538A1 (en) 2017-11-16 2018-10-19 A supply circuit

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WO (1) WO2019096538A1 (en)

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1321854A (en) * 1969-08-29 1973-07-04 Matsushita Electric Ind Co Ltd Power supply unit for a magnetron oscillator
FR2284976A1 (en) * 1974-09-10 1976-04-09 Matsushita Electric Ind Co Ltd POWER SUPPLY MEANS FOR A MAGNETRON
US3973165A (en) * 1975-04-28 1976-08-03 Litton Systems, Inc. Power supply for a microwave magnetron
JPS5810393A (en) * 1981-07-08 1983-01-20 シャープ株式会社 Composite cooking device
US4620078A (en) * 1984-10-24 1986-10-28 General Electric Company Power control circuit for magnetron
US5082998A (en) 1990-01-16 1992-01-21 Yutaka Electric Mfg. Co., Ltd. Switching power supply for microwave oven
US5208432A (en) * 1990-04-14 1993-05-04 Goldstar Co., Ltd. Magnetron driving power supply circuit
EP1289340A2 (en) * 2001-08-30 2003-03-05 Lg Electronics Inc. Apparatus and method for controlling output power of combination hood and microwave oven
EP1379106A2 (en) * 2002-07-02 2004-01-07 Samsung Electronics Co., Ltd. Microwave oven and high voltage control circuit
CN106123054A (en) * 2016-07-02 2016-11-16 谭颖峰 A kind of electrical heating stove

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1321854A (en) * 1969-08-29 1973-07-04 Matsushita Electric Ind Co Ltd Power supply unit for a magnetron oscillator
FR2284976A1 (en) * 1974-09-10 1976-04-09 Matsushita Electric Ind Co Ltd POWER SUPPLY MEANS FOR A MAGNETRON
US3973165A (en) * 1975-04-28 1976-08-03 Litton Systems, Inc. Power supply for a microwave magnetron
JPS5810393A (en) * 1981-07-08 1983-01-20 シャープ株式会社 Composite cooking device
US4620078A (en) * 1984-10-24 1986-10-28 General Electric Company Power control circuit for magnetron
US5082998A (en) 1990-01-16 1992-01-21 Yutaka Electric Mfg. Co., Ltd. Switching power supply for microwave oven
US5208432A (en) * 1990-04-14 1993-05-04 Goldstar Co., Ltd. Magnetron driving power supply circuit
EP1289340A2 (en) * 2001-08-30 2003-03-05 Lg Electronics Inc. Apparatus and method for controlling output power of combination hood and microwave oven
EP1379106A2 (en) * 2002-07-02 2004-01-07 Samsung Electronics Co., Ltd. Microwave oven and high voltage control circuit
CN106123054A (en) * 2016-07-02 2016-11-16 谭颖峰 A kind of electrical heating stove

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