GB2199998A - Drive circuitry for a microwave source of a microwave oven - Google Patents
Drive circuitry for a microwave source of a microwave oven Download PDFInfo
- Publication number
- GB2199998A GB2199998A GB08631005A GB8631005A GB2199998A GB 2199998 A GB2199998 A GB 2199998A GB 08631005 A GB08631005 A GB 08631005A GB 8631005 A GB8631005 A GB 8631005A GB 2199998 A GB2199998 A GB 2199998A
- Authority
- GB
- United Kingdom
- Prior art keywords
- microwave
- source
- microwave oven
- drive circuitry
- microwave source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000003990 capacitor Substances 0.000 claims abstract description 12
- 229910052754 neon Inorganic materials 0.000 claims abstract description 6
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 description 10
- 230000010355 oscillation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
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
- H05B6/666—Safety circuits
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3372—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration of the parallel type
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Control Of High-Frequency Heating Circuits (AREA)
Abstract
Circuitry of a microwave source of a microwave oven comprises electrical switching means (1, 2, 3) operable from a DC source and means (6, 7, 8, 9, 10, 11, 12) for converting an output of the switching means to a high voltage for use in operating the microwave source. The switching means comprises an oscillator the output from which charges capacitor 6, which is discharged through transformer T2 by means of a neon switch 7. <IMAGE>
Description
DRIVE CIRCUITRY FOR A MICROWAVE SOURCE OF
MICROWAVE OVEN
The present invention relates to drive circuitry for a microwave source (such as a magnetron or a klystron) of a microwave oven.
According to the present invention, there is provided drive circuitry for a microwave source of a microwave oven, comprising electrical oscillator means operable from a D.C. source and means for converting an output of the oscillator means to a high voltage for use in operating the source.
The D.C. source could, for example, be a 12v or 24v battery of a vehicle or 110v , for example.
The present invention will now be described, by way of example, with reference to the single figure of the accompanying drawing, which is a circuit diagram of an example of drive circuitry for the magnetron of a microwave oven.
Referring to the single figure of the accompanying drawing, an integrated circuit type GG6 timer 1 is connected across a 12v supply and ground potential and has an input connected to rtceive a reference voltage (Vref.) for setting the power output of the drive circuitry. Two timing outputs of circuit 1 are connected to the bases of transistors 2 and 3 respectively, the emitters of these transistors being connected to ground potential and their collectors being connected to opposite ends of the primary winding 4 of a 5v to 240v transformer T1. The winding 4 is centre-ta,pped to the 12v supply and there are connected across the secondary winding 5 of transformer T1 a capacitor 6 and in parallel with it a neon switch 7.The capacitor 6 (which may be of a value up to 470pF for example) and the neon switch 7 are also connected in parallel across the primary winding 8 of a further step-up transformer T2. Connected across the secondary winding 9 of transformer T2 is a series connection of three (for example) capacitors 10, 11 and 12 each of which is (for example) a 470of capacitor.
Connected to one terminal (the EHT terminal) of secondary winding 9 is the collector of a transistor 13, whose emitter is connected to energise the heaters of a magnetron, the EHT terminal supplying a high voltage for operating the magnetron. The magnetron (not shown) provides a microwave source of a microwave oven, the oven having a section which houses the drive circuitry shown in the drawing. A capacitor 14 (for example a 470of capacitor) is connected between the collector and base of transistor 13 and a capacitor 15 (for - example a 470 pF capacitor) is connected between the collector and emitter of transistor 13.
The base of transistor 13 is connected to the 12v supply.
The drive circuitry operates as follows. Transistors 2 and 3 act as a variable oscillator which drives the primary winding 4 of transformer T1. The frequency of oscillation is determined by the reference voltage applied to- timing circuit 1 and hence the frequency of the timing pulses applied to transistors 2 and 3. The output of transformer T1 across secondary winding 5 charges capacitor 6 until neon switch 7 is activated to- drive the primary winding of transformer T2 from approximately 300v instantaneous to ground potential.
The resultant output across the secondary winding 9 of transformer T2 is (for example) in the range from 2 - 20kv depending on the frequency of oscillation as determined by the reference voltage and provides the operating (EHT) voltage for the magnetron. The voltage for the heaters at the emitter of transistor 13 is a voltage regulated at (for example) about 4v with reference to the EHT voltage.
Claims (5)
1. Circuitry for a microwave source of a microwave oven, comprising electrical switching means operable from a DC source and means for converting an output of the switching means to a high voltage for use in operating the microwave source.
2. Circuitry according to claim 1, wherein the said switching means comprises oscillator means.
3. Circuitry according to claim 1 or 2, wherein the said converting means comprises capacitor means charged by the output of the said switching means, a neon switch activated when the capacitor means attains a certain charging value and transformer means connected across the neon switch.
4. Circuitry for a microwave source of a microwave oven, substantially as herein described with reference to the accompanying drawing.
5. A microwave oven provided with circuitry according to any preceding claim for operating its microwave source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08631005A GB2199998A (en) | 1986-12-30 | 1986-12-30 | Drive circuitry for a microwave source of a microwave oven |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08631005A GB2199998A (en) | 1986-12-30 | 1986-12-30 | Drive circuitry for a microwave source of a microwave oven |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8631005D0 GB8631005D0 (en) | 1987-02-04 |
| GB2199998A true GB2199998A (en) | 1988-07-20 |
Family
ID=10609657
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08631005A Withdrawn GB2199998A (en) | 1986-12-30 | 1986-12-30 | Drive circuitry for a microwave source of a microwave oven |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2199998A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2291322A (en) * | 1994-07-12 | 1996-01-17 | Samsung Electronics Co Ltd | Microwave oven |
| GB2296415A (en) * | 1994-12-23 | 1996-06-26 | Stephen Marks | Microwave oven |
| GB2354648A (en) * | 1999-09-21 | 2001-03-28 | Samsung Electronics Co Ltd | Magnetron driving circuit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1036565A (en) * | 1963-08-09 | 1966-07-20 | Wolseley Engineering Ltd | Improvements in or relating to electric supply arrangements |
| GB1366619A (en) * | 1971-11-23 | 1974-09-11 | Bendix Corp | Battery powered blasting machine with a controlled energy range |
| EP0171170A2 (en) * | 1984-08-02 | 1986-02-12 | Kenwood Limited | Microwave oven |
| EP0205642A1 (en) * | 1985-06-24 | 1986-12-30 | Deutsche Thomson-Brandt GmbH | D.C. to D.C. converter |
-
1986
- 1986-12-30 GB GB08631005A patent/GB2199998A/en not_active Withdrawn
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1036565A (en) * | 1963-08-09 | 1966-07-20 | Wolseley Engineering Ltd | Improvements in or relating to electric supply arrangements |
| GB1366619A (en) * | 1971-11-23 | 1974-09-11 | Bendix Corp | Battery powered blasting machine with a controlled energy range |
| EP0171170A2 (en) * | 1984-08-02 | 1986-02-12 | Kenwood Limited | Microwave oven |
| EP0205642A1 (en) * | 1985-06-24 | 1986-12-30 | Deutsche Thomson-Brandt GmbH | D.C. to D.C. converter |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2291322A (en) * | 1994-07-12 | 1996-01-17 | Samsung Electronics Co Ltd | Microwave oven |
| FR2722559A1 (en) * | 1994-07-12 | 1996-01-19 | Samsung Electronics Co Ltd | MICROWAVE OVEN |
| GB2296415A (en) * | 1994-12-23 | 1996-06-26 | Stephen Marks | Microwave oven |
| GB2354648A (en) * | 1999-09-21 | 2001-03-28 | Samsung Electronics Co Ltd | Magnetron driving circuit |
| US6222169B1 (en) | 1999-09-21 | 2001-04-24 | Samsung Electronics Co., Ltd. | Surge-resistant magnetron circuit for use with DC power source |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8631005D0 (en) | 1987-02-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |