Source: http://www.google.com/patents/US6842100?dq=inassignee:doubleclick
Timestamp: 2014-08-31 03:24:55
Document Index: 753677900

Matched Legal Cases: ['art. 2', 'art.\n3', 'art.\n4', 'art 30', 'art 40', 'arts 30', 'art 40', 'art 30', 'art 40']

Patent US6842100 - High voltage transformer for microwave oven and method of manufacturing therefor - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA high voltage transformer for a microwave oven includes a core, and primary and secondary coils. An insulation molding part encloses at least a part of the secondary coil and has a sensor accommodation portion formed therein. A temperature sensor is accommodated in the sensor accommodating portion for...http://www.google.com/patents/US6842100?utm_source=gb-gplus-sharePatent US6842100 - High voltage transformer for microwave oven and method of manufacturing thereforAdvanced Patent SearchPublication numberUS6842100 B1Publication typeGrantApplication numberUS 09/543,865Publication dateJan 11, 2005Filing dateApr 5, 2000Priority dateJul 28, 1999Fee statusPaidAlso published asCN1167090C, CN1282970A, US6808669, US20020089085Publication number09543865, 543865, US 6842100 B1, US 6842100B1, US-B1-6842100, US6842100 B1, US6842100B1InventorsCheol-Jin KimOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (8), Referenced by (2), Classifications (12), Legal Events (3) External Links: USPTO, USPTO Assignment, EspacenetHigh voltage transformer for microwave oven and method of manufacturing thereforUS 6842100 B1Abstract A high voltage transformer for a microwave oven includes a core, and primary and secondary coils. An insulation molding part encloses at least a part of the secondary coil and has a sensor accommodation portion formed therein. A temperature sensor is accommodated in the sensor accommodating portion for detecting temperature of the secondary coil. The sensor accommodating portion can be formed inside of the insulation molding part together with the temperature sensor, or formed outside of the insulation molding part in a pocket shape. With either configuration, the temperature sensor can be positioned at the correct sensor position, thereby improving the detecting accuracy of the temperature sensor. In addition, it is easy to repair and/or replace the temperature sensor.
1. A high voltage transformer for a microwave oven, said transformer including a core and primary and secondary coils, and further comprising:
an insulation molding part entirely enclosing said secondary coil and including a sensor accommodating portion provided separately from the core; and a temperature sensor, accommodated in said sensor accommodating portion, for detecting the temperature of the secondary coil, said temperature sensor being exposed on one side thereof to said secondary coil but being otherwise completely enclosed within said sensor accommodating portion of said insulation molding part. 2. The high voltage transformer according to claim 1, wherein said sensor accommodating portion is disposed inside of said insulating molding part.
3. The high voltage transformer according to claim 2, wherein said sensor is disposed directed adjacent to said secondary coil inside of said insulating molding part.
4. The high voltage transformer according to claim 2, wherein said temperature sensor comprises one of a thermostat and a thermistor.
5. The high voltage transformer according to claim 1, wherein said sensor accommodating portion is of a shape permitting said temperature sensor to be put into said sensor accommodating portion.
6. The high voltage transformer according to claim 4, wherein said temperature sensor comprises one of a thermostat, a thermistor and a fuse.
7. A microwave oven including a housing, a cooking chamber within said housing, an electronic component compartment within said housing, a door for said cooking chamber, and a control panel installed within said housing in front of said electronic compartment, said electronic component compartment including a high voltage transformer for generating a high voltage when the microwave oven is supplied with power from a power supply, a high voltage capacitor which is charged to a high voltage by the high voltage transformer, and a magnetron for generating microwaves and radiating the microwaves into the cooking chamber when discharge of the high voltage capacitor supplies the magnetron with a high voltage, said high voltage transformer including a core and primary and second coils, and further comprising:
an insulating molding part entirely enclosing said secondary coil and including a sensor accommodating portion provided separately from the core; and a temperature sensor, accommodated in said sensor accommodating portion, for detecting the temperature of the secondary coil, said temperature sensor being exposed on one said thereof to said secondary coil but being otherwise completely enclosed within said sensor accommodating portion of said insulating molding part, and said temperature sensor and said secondary coil being molded together by said insulating molding part to form an integral unit.
The present invention relates to high voltage transformers for microwave ovens and manufacturing methods therefor, and more particularly, to an improved high voltage transformer for a microwave oven including a core, and primary and secondary coils, and an improved manufacturing method therefor.
FIG. 8 is an exploded perspective view of a conventional high voltage transformer, while FIG. 9 is an enlarged cross sectional view taken generally along line IX�IX of FIG. 8, showing a part of a secondary coil. As shown in FIG. 8, the conventional high voltage transformer, which is denoted 120, has an I-shaped core 121, and an E-shaped core 123, both of which are made of silicon steel. A primary coil 125 is connected to an external power supply, (not shown) and a secondary coil 129 is connected to a magnetron (not shown). An insulating member or micasheet 127 made of a suitable insulating material is positioned between the primary and secondary coils 125 and 129, and a heater coil 131 is positioned between the insulating member 127 and the secondary coil 129. As illustrated, insulating member 127 may be formed as two separate parts.
SUMMARY OF THE INVENTION To solve the above discussed problems, it is an object of the present invention to provide a high voltage transformer for a microwave oven in which a temperature sensor is securely positioned at its desired position relative to a secondary coil, thereby improving the detecting accuracy of the temperature sensor, and to provide a method of manufacturing such a transformer.
To accomplish these and other objects of the present invention, there is provided a high voltage transformer for a microwave oven including a core, and primary and secondary coils, wherein the high voltage transformer further comprises an insulation molding part which encloses at least a part of said secondary coil and which includes a sensor accommodating portion, and a temperature sensor disposed or accommodated in said sensor accommodating portion for detecting temperature of the secondary coil.
Preferably, the sensor accommodating portion is formed inside of the insulation molding part, and the temperature sensor is one of a thermostat and a thermistor. Advantageously, when a thermistor is used, a safety device such as a fuse is also employed.
BRIEF DESCRIPTION OF THE DRAWINGS The present invention will be better understood, and the various objects and advantages thereof will be more fully appreciated, from the following description of the invention, taken in conjunction with the accompanying drawings, in which:
FIG. 4 is an enlarged cross sectional view taken generally along line IV�IV of FIG. 3, showing a portion of the secondary coil part;
FIG. 5 is a flowchart of a manufacturing process of the secondary coil of FIG. 4;
FIG. 7 is an enlarged cross sectional view taken generally along line VII�VII of FIG. 6 showing a portion of the secondary coil;
FIG. 9, which was also described above, is an enlarged cross sectional view taken generally along line IX�IX of FIG. 8 showing a portion of the secondary coil part.
The transformer 20 is shown in more detail in FIGS. 2, 3 and 4, wherein, as noted above, FIG. 2 is an exploded perspective view of the high voltage transformer 20 of FIG. 1, FIG. 3 is an assembled perspective view of the high voltage transformer of FIG. 2 and FIG. 4 is an enlarged cross sectional view taken generally along line IV�IV of FIG. 3. As shown in various of these figures, the high voltage transformer 20 includes an I-shaped core 21, and an E-shaped core 23, (both of which are preferably made of silicon steel), a primary coil part 30 which is connected to the external power supply (not shown), and a secondary coil part 40 which is connected to the magnetron 13. An insulator or micasheet 27, made of a suitable insulating material, is positioned between the primary and secondary coil parts 30 and 40, and a heater coil 29 is positioned between the insulator 27 and the secondary coil part 40.
A thermostat is preferably used as the temperature sensor 43 which is molded together with the secondary coil 41. The thermostat detects temperature of the secondary coil 41 and corresponding temperature values are received by a controller (not shown). The thermostat is automatically turned off when the detected temperature is above a predetermined value. Where the thermostat is used as the sensor 43, one terminal 49 (FIGS. 2 and 3) of the thermostat is connected to one of the input terminals 33 installed in the primary coil part 30 and the other terminal 50 thereof (FIGS. 2 and 3) is connected to the external power supply (not shown). The secondary coil part 40 includes a pair of connection terminals 51 which are spaced from, and preferably disposed in opposition to, the temperature sensor 43, and which are connected to other components in the electronic component compartment 5.
In an alternative embodiment, a thermistor is used as a temperature sensor 43. In this embodiment, the thermistor detects temperature of the secondary coil 41 and the corresponding detected temperature values are received by the controller (not shown). However, since the thermistor is not turned off even though the detected temperature is above a predetermined value, it is preferable to use the thermistor along with one or more other components which function as a temperature responsive safety device (e. g., a fuse).
As indicated above, FIG. 5 is an enlarged perspective view of a high voltage transformer in which a secondary coil part according to a secondary embodiment of the present invention is installed on a printed circuit board (PCB), while FIG. 6 is an enlarged cross sectional view of the secondary coil part, taken generally line VI�VI of FIG. 5.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS3959675 *Jun 19, 1974May 25, 1976Gould Inc.Bobbin-flange mounted thermal protector for electric motorsUS4112405 *Aug 16, 1976Sep 5, 1978Mark JosephCoil with protection against overheatingUS4221949May 31, 1978Sep 9, 1980Sharp Kabushiki KaishaAbnormal temperature detection and microwave generation suppression in a microwave ovenUS4454554 *Aug 2, 1982Jun 12, 1984The General Industries CompanyCoil bobbinUS5742221 *Oct 15, 1996Apr 21, 1998Lg Electronics, Inc.Electric power disconnection apparatus for microwave ovenUS5886327Nov 13, 1997Mar 23, 1999Samsung Electronics Co., LtdPower supply unit for a microwave oven and a high-voltage fuse used thereinUS5925280 *Aug 29, 1997Jul 20, 1999Samsung Electronics Co., Ltd.Fuse housing for a microwave ovenUS5941357 *Sep 10, 1997Aug 24, 1999Denso CorporationElectromagnetic clutch* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8598973 *Apr 30, 2010Dec 3, 2013Sumitomo Electric Industries, Ltd.ReactorUS20120044033 *Apr 30, 2010Feb 23, 2012Hajime KawaguchiReactor* Cited by examinerClassifications U.S. Classification336/198International ClassificationH01F30/00, H01F27/40, H01F27/24, H01F27/32Cooperative ClassificationH05B6/662, H05B6/666, H01F27/327, H01F27/402, H01F2027/406European ClassificationH01F27/40A, H01F27/32ELegal EventsDateCodeEventDescriptionJun 29, 2012FPAYFee paymentYear of fee payment: 8Jun 27, 2008FPAYFee paymentYear of fee payment: 4Apr 5, 2000ASAssignmentOwner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KIM, CHEOL-JIN;REEL/FRAME:010692/0384Effective date: 20000317RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google