GB759038A - Improvements in and relating to high frequency heating apparatus - Google Patents
Improvements in and relating to high frequency heating apparatusInfo
- Publication number
- GB759038A GB759038A GB2599753A GB2599753A GB759038A GB 759038 A GB759038 A GB 759038A GB 2599753 A GB2599753 A GB 2599753A GB 2599753 A GB2599753 A GB 2599753A GB 759038 A GB759038 A GB 759038A
- Authority
- GB
- United Kingdom
- Prior art keywords
- capacitors
- oscillator
- motor
- frequency
- discriminator
- 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.)
- Expired
Links
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
- H05B6/46—Dielectric heating
- H05B6/48—Circuits
- H05B6/50—Circuits for monitoring or control
Abstract
759,038. Automatic frequency control systems. NATIONAL RESEARCH DEVELOPMENT CORPORATION. Sept. 20, 1954 [Sept. 21, 1953], No. 25997/53. Class 38 (4). In an R.F. heating, e.g. diathermy, apparatus in which the oscillator 11, 12 is coupled to a treatment circuit 16 influencing the frequency of the oscillator the oscillator is coupled also to a frequency discriminator whose output, amplified and applied to a motor 19, controls variable tuning elements, e.g. capacitors 15a, 15b of the treatment circuit to compensate any reactance charges in the load circuit and stabilize the oscillator at the cross-over frequency of the discriminator. A switch 35 may be operated to disconnect one of the push-pull amplifier valves 33, 34 and drive the motor 19 till the discriminator operating range is reached. The capacitors 15a, 15b may be controlled by cams giving the capacitors a continuous increase followed by a quick return to their minimum value, of, if the capacitors are of the alternate increase and decrease type a further switch may be in series with the switch 35 and controlled by a cam on the cam-shaft so that the motor 9 is always driven till a position of stability of the capacitors is obtained. Specification 718,439 is referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2599753A GB759038A (en) | 1953-09-21 | 1953-09-21 | Improvements in and relating to high frequency heating apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB2599753A GB759038A (en) | 1953-09-21 | 1953-09-21 | Improvements in and relating to high frequency heating apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB759038A true GB759038A (en) | 1956-10-10 |
Family
ID=10236699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB2599753A Expired GB759038A (en) | 1953-09-21 | 1953-09-21 | Improvements in and relating to high frequency heating apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB759038A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4709701A (en) * | 1986-04-15 | 1987-12-01 | Medical Research & Development Associates | Apparatus for medical treatment by hyperthermia |
-
1953
- 1953-09-21 GB GB2599753A patent/GB759038A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4709701A (en) * | 1986-04-15 | 1987-12-01 | Medical Research & Development Associates | Apparatus for medical treatment by hyperthermia |
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