CN109549462B - Constant power control method and device for automatic frying pan and automatic frying pan - Google Patents

Constant power control method and device for automatic frying pan and automatic frying pan Download PDF

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Publication number
CN109549462B
CN109549462B CN201811510047.7A CN201811510047A CN109549462B CN 109549462 B CN109549462 B CN 109549462B CN 201811510047 A CN201811510047 A CN 201811510047A CN 109549462 B CN109549462 B CN 109549462B
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magnetic field
preset
input power
real
field intensity
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CN109549462A (en
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温国思
蔡传斌
王小波
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Huizhou Topband Electronic Technology Co Ltd
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Huizhou Topband Electronic Technology Co Ltd
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    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J27/00Cooking-vessels
    • A47J27/002Construction of cooking-vessels; Methods or processes of manufacturing specially adapted for cooking-vessels
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • AHUMAN NECESSITIES
    • A47FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
    • A47JKITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
    • A47J36/00Parts, details or accessories of cooking-vessels
    • A47J36/24Warming devices
    • A47J36/2483Warming devices with electrical heating means
    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05FSYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/66Regulating electric power
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B40/00Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Abstract

The invention relates to a constant power control method and device for an automatic frying pan and the automatic frying pan, and the constant power control method for the automatic frying pan comprises the following steps: s1, pre-storing a preset relation between preset input power of a pot work coil and preset magnetic field intensity at a preset position; s2, acquiring target input power of a pot work coil, so as to acquire target magnetic field intensity corresponding to the target input power according to a preset relation; s3, acquiring real-time input power of the working coil and real-time magnetic field intensity corresponding to the real-time input power, and adjusting the real-time input power of the working coil of the cooker when the real-time magnetic field intensity does not meet the target magnetic field intensity. The invention can ensure that the power received by the cooker is constant to be the preset power in real time, and ensure the cooking effect.

Description

Constant power control method and device for automatic frying pan and automatic frying pan
Technical Field
The invention relates to the technical field of automatic frying pans, in particular to a constant power control method and device for an automatic frying pan and the automatic frying pan.
Background
In the conventional electromagnetic heating, the input power of the working coil is generally used as the actual receiving power of the cooker, and at this time, in order to ensure that the actual receiving power of the cooker is the preset power, the position of the cooker is usually preset, but in the actual situation, various conditions, such as a shift in the position of the cooker, are unavoidable due to long-term use of the automatic frying pan, and the automatic frying pan is not found when in use, so that the receiving power of the cooker is not the preset power, and if the automatic frying pan is continuously operated according to the previously set program, the frying pan may be out of cooking, and the like. Or foreign matters influencing the work are entered into the automatic frying pan, so that the power actually received by the pan is changed, and the frying effect is also influenced.
Disclosure of Invention
The invention aims to solve the technical problems of the prior art and provides a constant power control method and device for an automatic frying pan and the automatic frying pan.
The technical scheme adopted for solving the technical problems is as follows: a constant power control method of an automatic frying pan is constructed, which comprises the following steps:
s1, pre-storing a preset relation between preset input power of a pot work coil and preset magnetic field intensity at a preset position;
s2, acquiring target input power of the pot work coil, so as to acquire target magnetic field intensity corresponding to the target input power according to the preset relation;
s3, acquiring real-time input power of the working coil and real-time magnetic field intensity corresponding to the real-time input power, and adjusting the real-time input power of the pot working coil when the real-time magnetic field intensity does not meet the target magnetic field intensity.
Preferably, in the step S1, the pre-storing the preset relationship between the preset magnetic field strength and the preset input power includes:
s11, acquiring the preset input power, and measuring the preset magnetic field intensity corresponding to the preset input power at the preset position;
s12, acquiring the distance between the pot and the preset position, the equivalent resistance value of the pot working coil and the angle factor of the receiving magnetic field at the preset position;
s13, calculating the preset relation according to the distance between the cooker and the preset position, the equivalent resistance value, the angle factor, the preset input power and the preset magnetic field intensity.
Preferably, the preset relation calculation formula:
wherein Pin is the input power of the pot work coil, and Hout is the magnetic field intensity detected at the preset position. Spot is the distance between the pot and the preset position, rspot is the equivalent resistance value of the pot working coil, COS phi is the angle factor of the magnetic field received at the preset position.
Preferably, in the step S3, when the real-time magnetic field strength does not meet the target magnetic field strength, adjusting the real-time input power of the working coil includes:
comparing the real-time magnetic field strength with the target magnetic field strength, and reducing the real-time input power of the pot work coil when the real-time magnetic field strength is larger than the target magnetic field strength; and when the real-time magnetic field intensity is smaller than the target magnetic field intensity, increasing the real-time input power of the pot work coil.
The invention also constructs a constant power control device of the automatic frying pan, which comprises a control unit, and a magnetic field detection unit, a power detection unit and a power adjustment unit which are connected with the control unit;
the control unit comprises a storage unit for storing a preset relation between preset magnetic field intensity of a preset position and preset input power;
the magnetic field detection unit is arranged close to the pot work coil and is used for detecting the magnetic field intensity of the pot work coil at a preset position;
the power detection unit is connected with the pot work coil and is used for detecting real-time input power of the pot work coil;
the power adjusting unit is connected with the pot work coil and is used for adjusting the input power of the pot work coil.
Preferably, the magnetic field detection unit comprises a detection coil L2, a filtering unit, an operational amplifier unit and a rectifying unit, wherein the filtering unit, the operational amplifier unit and the rectifying unit are sequentially connected with the detection coil L2 in a cascade connection mode, and the rectifying unit is connected with the control unit.
Preferably, the filtering unit includes a capacitor CS; and/or
The operational amplifier circuit comprises an operational amplifier U1A, wherein the reverse input end of the operational amplifier U1A is grounded through a resistor RS, the positive input end of the operational amplifier U1A is connected with the output end of the operational amplifier U1A through a resistor RF, the positive input end of the operational amplifier U1A is grounded through a resistor R1, and the output end of the operational amplifier U1A is grounded through a capacitor CD and a resistor RD which are connected in parallel; and/or
The rectification circuit comprises a diode D1, wherein the positive electrode of the diode D1 is connected with the output end of the operational amplifier circuit, and the negative electrode of the diode D1 is connected with the control unit.
Preferably, the power adjustment unit includes a switching unit and a driving unit connected with the switching unit.
Preferably, the switch unit includes an IGBT tube IGBT1, a collector of the IGBT tube IGBT1 is connected to one end of the working coil, an emitter of the IGBT tube IGBT1 is grounded, and a base of the IGBT tube IGBT1 is connected to the driving unit.
The invention also constructs an automatic frying pan, which comprises the constant power control device of the automatic frying pan.
The constant power control method and device for the automatic frying pan and the automatic frying pan have the following beneficial effects: the power received by the cooker can be ensured to be constant to be preset power, and the cooking effect is ensured.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a program flow chart of an embodiment of a method for controlling constant power of an automatic cooking pot according to the present invention;
FIG. 2 is a schematic diagram of the principle of magnetic field detection in the automatic frying pan of the present invention;
FIG. 3 is a schematic diagram of the structure of the constant power control device of the automatic frying pan;
fig. 4 is a schematic circuit diagram of an embodiment of a constant power control device for an automatic cooking pot according to the present invention.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings.
As shown in fig. 1, in an embodiment of a constant power control method of an automatic frying pan of the present invention, the method includes the following steps: s1, pre-storing a preset relation between preset input power of a pot work coil and preset magnetic field intensity at a preset position; specifically, because the automatic frying pan is being set, wherein the distance between the pan and the pan working coil can be set in advance, when the positional relationship between the pan and the pan working coil is already set, when the input power of the pan working coil is fixed, the power actually received by the pan is also fixed. It will also be appreciated that the strength of the magnetic field received around the cookware is also constant. When the input power of the working coil of the cooker is changed, the intensity of the magnetic field received around the cooker is also changed according to a certain rule. Here, the actual received power of the pan may be reflected by the strength of the magnetic field around the pan. And selecting a fixed position around the working coil of the cooker as a preset position, and reflecting the power actually received by the cooker by using the preset position, wherein the relation between the magnetic field intensity measured at the position and the input power of the working coil of the cooker is prestored, and the prestored relation is the preset relation. Of course, it is understood that the preset relationship may be a curve or a constant value. The actual received power of the cookware is determined to be the expected received power through the relation.
S2, acquiring target input power of a pot work coil, so as to acquire target magnetic field intensity corresponding to the target input power according to a preset relation; specifically, in the working process of the frying pan, the target input power of the working coil of the pan is obtained according to the required receiving power of the pan, and the corresponding target magnetic field intensity at the preset position is calculated according to the preset relation.
S3, acquiring real-time input power of the working coil and real-time magnetic field intensity corresponding to the real-time input power, and adjusting the real-time input power of the working coil of the cooker when the real-time magnetic field intensity does not meet the target magnetic field intensity. Specifically, the real-time input power of the working coil is obtained, the corresponding real-time magnetic field intensity is obtained according to the real-time input power, the real-time magnetic field intensity is a measured value, when the real-time magnetic field intensity at the moment does not meet the calculated target magnetic field intensity, the real-time input power of the working coil of the pot is adjusted to obtain the real-time magnetic field intensity at the preset position as the target magnetic field intensity, and therefore the actual receiving power of the pot can be guaranteed to be the preset target input power, and the receiving power of the pot is guaranteed to be constant.
Further, in step S1, pre-storing the preset relationship between the preset magnetic field strength and the preset input power includes:
s11, acquiring preset input power, and measuring the preset magnetic field intensity corresponding to the preset input power at a preset position; specifically, when the preset relation between the preset magnetic field intensity and the preset input power is pre-stored, the preset input power can be adjusted according to the preset power level, and a plurality of preset magnetic field intensities corresponding to a plurality of different preset input powers are obtained at preset positions. The operation can be set when the automatic frying pan leaves the factory, or can be performed after the distance between the pan and the working coil of the pan is confirmed after the automatic frying pan is installed, and can be used as the initialization setting before the equipment leaves the factory or is used.
S12, obtaining the distance between the pot and a preset position, the equivalent resistance value of a working coil of the pot and the angle factor of a receiving magnetic field at the preset position; specifically, when the preset magnetic field strength corresponding to the preset input power is obtained, the distance between the pot and the preset position can be considered, the equivalent resistance value of the working coil of the pot can be confirmed in advance, meanwhile, the magnetic field direction of the electromagnetic wave emitted by the working coil of the pot can be obtained and confirmed at the preset position, as shown in fig. 2, it can be understood that the magnetic field receiving method can be defined by the angle phi of the receiving magnetic field, and the angle factor is actually used when the preset relation between the preset input power and the preset magnetic field strength is calculated.
S13, calculating a preset relation according to the distance between the cooker and a preset position, the equivalent resistance value, the angle factor, preset input power and preset magnetic field intensity. It will be appreciated that when the above parameters are obtained, since the parameters are key parameters that actually affect the magnetic field strength actually received at the preset position, a relatively accurate preset relationship between the preset magnetic field strength and the preset input power can be calculated by the above parameters.
Further, on the basis of the above, the preset relation calculation formula includes:
wherein Pin is the input power of a working coil of the cooker, and Hout is the magnetic field intensity of a preset position. Spot is the distance between the pot and a preset position, rspot is the equivalent resistance value of a working coil of the pot, and COS phi is the angle factor of a receiving magnetic field at the preset position. It will be appreciated that after the above parameters are obtained, a specific formula may be referenced to perform a calculation of a preset relationship between the preset magnetic field strength and the preset input power.
Further, in step S3, when the real-time magnetic field strength does not meet the target magnetic field strength, adjusting the real-time input power of the working coil includes: comparing the real-time magnetic field intensity with the target magnetic field intensity, and reducing the real-time input power of the working coil of the cooker when the real-time magnetic field intensity is larger than the target magnetic field intensity; when the real-time magnetic field intensity is smaller than the target magnetic field intensity, the real-time input power of the pot work coil is increased. Specifically, the magnetic field intensity at the preset position reflects the actual receiving power of the cooker, and when the real-time magnetic field intensity is larger than the target magnetic field intensity, the real-time input power of the working coil of the cooker is reduced; when the real-time magnetic field intensity is smaller than the target magnetic field intensity, the real-time input power of the pot work coil is increased.
In addition, as shown in fig. 3, the constant power control device of the automatic frying pan of the invention comprises a control unit 120, and a magnetic field detection unit 140, a power detection unit 130 and a power adjustment unit 150 which are connected with the control unit 120; the control unit 120 includes a storage unit for storing a preset relationship between a preset magnetic field strength of a preset position and a preset input power; the magnetic field detection unit 140 is disposed near the pot work coil 100, and is used for detecting the magnetic field intensity of the pot work coil 110 at a preset position; the power detection unit 130 is connected with the pot work coil 110 and is used for detecting real-time input power of the pot work coil 110; the power adjustment unit 150 is connected to the pot work coil 110, and is used for adjusting the input power of the pot work coil 110. Specifically, the control unit 120 stores a preset relationship between a preset magnetic field strength and a preset input power at a preset position corresponding to the pot work coil 110 through the storage unit, and sets a magnetic field detection unit 140 at the preset position of the pot work coil 110, where the magnetic field detection unit 140 is kept at a relative distance from the pot work coil 110, that is, the position of the magnetic field detection unit 140 relative to the pot work coil 110 is fixed, so as to monitor the actual magnetic field strength of the pot work coil 110 at the preset position. It will be appreciated that the magnetic field strength detected by the magnetic field detecting unit 140 may directly reflect the amount of power actually received by the pot 200. The power monitoring unit connected to the pot work coil 110 detects the actual input power of the pot work coil 110, and the relationship between the actual input power of the pot work coil 110 and the actual received power of the pot 200, i.e., the magnetic field strength detected by the magnetic field detecting unit 140 is constant during normal operation. When the preset receiving power of the pan 200 needs to be set, the target input power of the pan work coil 110 may be obtained first, the target magnetic field strength that the magnetic field detection unit 140 should measure at the preset position is calculated according to the target input power, then the real-time input power of the pan work coil 110 is obtained, the real-time magnetic field strength actually measured by the magnetic field detection unit 140 at the real-time input power is obtained, the real-time magnetic field strength is compared with the target magnetic field strength, and when the calculated target magnetic field strength is different from the measured real-time magnetic field strength, the input power of the pan is adjusted by the power adjustment unit 150 connected with the pan work coil 110, so that the finally measured real-time magnetic field strength is the calculated target magnetic field strength. So as to achieve that the power actually received by the cooker is constant power.
Further, as shown in fig. 4, the magnetic field detection unit 140 includes a detection coil L2, a filtering unit, an op-amp unit, and a rectifying unit sequentially connected in cascade with the detection coil L2, and the rectifying unit is connected with the control unit 120. Specifically, the magnetic field detection unit 140 includes a detection coil L2, after the detection coil L2 detects, the detection coil is subjected to frequency selection by the filtering unit, and then sent to the op-amp unit to amplify a detection signal, and then the detection signal is subjected to ac-dc change by the rectifying unit, so as to generate a voltage or current signal capable of reflecting the intensity of the received magnetic field. It can be understood that the positional relationship between the detecting coil L2 and the pot work coil 110 is a fixed arrangement.
Further, in an embodiment, the filtering unit includes a capacitor CS; in one embodiment, the operational amplifier circuit includes an operational amplifier U1A, wherein the inverting input terminal of the operational amplifier U1A is grounded through a resistor RS, the non-inverting input terminal of the operational amplifier U1A is connected to the output terminal of the operational amplifier U1A through a resistor RF, and the non-inverting input terminal of the operational amplifier U1A is grounded through a resistor R1, and the output terminal of the operational amplifier U1A is grounded through a capacitor CD and a resistor RD connected in parallel; in another embodiment, the rectifying circuit includes a diode D1, where an anode of the diode D1 is connected to an output terminal of the operational amplifier circuit, and a cathode of the diode D1 is connected to the control unit 120. Specifically, the filtering frequency selection of the detection signal can be performed through the capacitor filter Cs, the frequency-selected signal is amplified through the operational amplifier U1A, the output end of the operational amplifier U1A can be grounded through the capacitor CD and the resistor RD connected in parallel to further filter the output detection signal, and the rectification can be directly performed through the diode D1. A dc signal is output to the cathode of the diode D1.
Further, the power adjusting unit 150 includes a switching unit and a driving unit connected to the switching unit. Specifically, the power adjustment unit 150 includes a switching unit connected to the pot work coil 110, and a driving unit 151 connected to the switching unit, where the driving unit 151 drives a duty ratio of the switching unit to be turned on, so as to control a current of the tool work coil, and adjust an input power of the pot work coil 110.
Further, the switching unit includes an IGBT tube IGBT1, a collector of the IGBT tube IGBT1 is connected to one end of the operating coil, an emitter of the IGBT tube IGBT1 is grounded, and a base of the IGBT tube IGBT1 is connected to the driving unit 151. Specifically, the switching unit may use an IGBT tube, and drive the IGBT tube to turn on or off through the driving unit, so as to control the current flowing through the pot work coil 110. Further, the power detection unit 130 includes a voltage detection unit 131 and a current detection unit 132, which are respectively connected to the input ends of the pot work coil 110, and a power conversion unit 160 is further connected to the ac input end of the pot work coil 110, and the ac power input is subjected to brick mixing by the power conversion unit 160, so that a stack of control units 120 supplies power.
In addition, the automatic frying pan comprises the constant power control device of any one of the automatic frying pans. Specifically, the automatic frying equipment using cookers such as an automatic frying device or an automatic frying machine belongs to the automatic frying pot.
It is to be understood that the above examples only represent preferred embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that, for a person skilled in the art, the above technical features can be freely combined, and several variations and modifications can be made without departing from the scope of the invention; therefore, all changes and modifications that come within the meaning and range of equivalency of the claims are to be embraced within their scope.

Claims (4)

1. The constant power control method of the automatic frying pan is characterized by comprising the following steps of:
s1, pre-storing a preset relation between preset input power of a pot work coil and preset magnetic field intensity at a preset position;
s2, acquiring target input power of the pot work coil, so as to acquire target magnetic field intensity corresponding to the target input power according to the preset relation;
s3, acquiring real-time input power of the working coil and real-time magnetic field intensity corresponding to the real-time input power, and adjusting the real-time input power of the pot working coil when the real-time magnetic field intensity does not meet the target magnetic field intensity.
2. The method for controlling constant power of automatic cooker according to claim 1, wherein in step S1, the pre-storing the preset relationship between the preset magnetic field intensity and the preset input power comprises:
s11, acquiring the preset input power, and measuring the preset magnetic field intensity corresponding to the preset input power at the preset position;
s12, acquiring the distance between the pot and the preset position, the equivalent resistance value of the pot working coil and the angle factor of the receiving magnetic field at the preset position;
s13, calculating the preset relation according to the distance between the cooker and the preset position, the equivalent resistance value, the angle factor, the preset input power and the preset magnetic field intensity.
3. The automatic frying pan constant power control method according to claim 2, wherein the preset relation calculation formula:
wherein Pin is the input power of the working coil of the cooker, hout is the magnetic field intensity detected at the preset position, spot is the distance between the cooker and the preset position, rpot is the equivalent resistance value of the working coil of the cooker, and COS phi is the angle factor for receiving the magnetic field at the preset position.
4. A method for controlling constant power of an automatic cooker as claimed in claim 3, wherein, in said step S3, said adjusting the real-time input power of said working coil when said real-time magnetic field strength does not satisfy said target magnetic field strength comprises:
comparing the real-time magnetic field strength with the target magnetic field strength, and reducing the real-time input power of the pot work coil when the real-time magnetic field strength is larger than the target magnetic field strength; and when the real-time magnetic field intensity is smaller than the target magnetic field intensity, increasing the real-time input power of the pot work coil.
CN201811510047.7A 2018-12-11 2018-12-11 Constant power control method and device for automatic frying pan and automatic frying pan Active CN109549462B (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112524655B (en) * 2020-12-08 2022-02-25 珠海格力电器股份有限公司 Magnetic field control circuit, ion flame control method and device and plasma cooker

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CN107949088A (en) * 2016-10-12 2018-04-20 佛山市顺德区美的电热电器制造有限公司 The Poewr control method and power control device and electromagnetic oven of electromagnetic heating system

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Publication number Priority date Publication date Assignee Title
GB670099A (en) * 1949-04-27 1952-04-16 Birlec Ltd Improvements in or relating to high frequency electric induction heaters or furnaces
JP2000030849A (en) * 1998-07-15 2000-01-28 Mitsubishi Electric Corp Electromagnetic induction heated cooking device
JP2000082578A (en) * 1998-09-07 2000-03-21 Toshiba Corp Induction heating cooker
CN102204780A (en) * 2010-03-31 2011-10-05 叶小舟 Non-contact temperature-measuring electric cooker and temperature measuring method
CN103512061A (en) * 2012-06-18 2014-01-15 珠海格力电器股份有限公司 System for determining placement of pan on an electromagnetic oven, and electromagnetic oven
CN106152194A (en) * 2015-04-08 2016-11-23 浙江绍兴苏泊尔生活电器有限公司 Cooker heating control method, cooker and induction cooker
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