GB1518155A - Highfrequency oscillator - Google Patents
Highfrequency oscillatorInfo
- Publication number
- GB1518155A GB1518155A GB3749475A GB3749475A GB1518155A GB 1518155 A GB1518155 A GB 1518155A GB 3749475 A GB3749475 A GB 3749475A GB 3749475 A GB3749475 A GB 3749475A GB 1518155 A GB1518155 A GB 1518155A
- Authority
- GB
- United Kingdom
- Prior art keywords
- transistor
- switch
- oscillator
- coupling
- core
- 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
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
- A61B18/1206—Generators therefor
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B18/04—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating
- A61B18/12—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body by heating by passing a current through the tissue to be heated, e.g. high-frequency current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
- H02H5/047—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature using a temperature responsive switch
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/20—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for electronic equipment
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B18/00—Surgical instruments, devices or methods for transferring non-mechanical forms of energy to or from the body
- A61B2018/00636—Sensing and controlling the application of energy
- A61B2018/0066—Sensing and controlling the application of energy without feedback, i.e. open loop control
Landscapes
- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Biomedical Technology (AREA)
- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Veterinary Medicine (AREA)
- Plasma & Fusion (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Public Health (AREA)
- Power Engineering (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
1518155 Transistor oscillator SIEMENS AG 11 Sept 1975 [2 Oct 1974] 37494/75 Heading H3T In a HF oscillator, e.g. for surgical purposes, positive feedback across a transistor stage via a ferrite cored transformer is arranged so that prolonged off-load operation causes heating of the core past its Curie point, so reducing the coupling and the current through the transistor. The core, preferably in the form of a ferrite rod heated preferentially near its centre provides the coupling between windings 3, 4, their inductances with capacitors 4, 5 controlling the frequency around 1 MHz, the power output being taken from terminal 10 via capacitor 9 from between capacitors 4, 5. Foot switch 17 should switch off the oscillator when not required: the circuit protects the power transistor I from thermal damage in the event of switch 17 failing to switch off The maximum core loss occurs in the off-load condition (see equivalent circuit, Fig. 3 not shown) raising the temperature to the Curie point of 190‹C (Fig. 2 not shown), the sharp fall in relative permeability from about 400 to e.g. 100 causing a rise in frequency and fall in coupling, so driving the transistor I less hard.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19742447105 DE2447105C3 (en) | 1974-10-02 | 1974-10-02 | Oscillator for a high-frequency surgical device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1518155A true GB1518155A (en) | 1978-07-19 |
Family
ID=5927378
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3749475A Expired GB1518155A (en) | 1974-10-02 | 1975-09-11 | Highfrequency oscillator |
Country Status (4)
| Country | Link |
|---|---|
| DE (1) | DE2447105C3 (en) |
| FR (1) | FR2286661A1 (en) |
| GB (1) | GB1518155A (en) |
| IT (1) | IT1042848B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764964A (en) * | 2015-04-21 | 2015-07-08 | 华北电力大学 | High-capacity high-frequency power transformer analysis method and device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2852653A (en) * | 1956-08-17 | 1958-09-16 | Collins Radio Co | Ferrite heater and heat sensor |
| FR1358687A (en) * | 1963-04-03 | 1964-04-17 | Du Pont | Transducer sensitive to changes in temperature, pressure and magnetic field |
| DE1763346C3 (en) * | 1968-05-09 | 1974-06-06 | Siemens Ag, 1000 Berlin Und 8000 Muenchen | Circuit arrangement for overload protection for electronic relay arrangements |
| DE2158624A1 (en) * | 1971-11-26 | 1973-05-30 | Olympia Werke Ag | CIRCUIT ARRANGEMENT FOR MAINTAINING A CONSTANT TEMPERATURE |
-
1974
- 1974-10-02 DE DE19742447105 patent/DE2447105C3/en not_active Expired
-
1975
- 1975-09-11 GB GB3749475A patent/GB1518155A/en not_active Expired
- 1975-09-25 IT IT2762375A patent/IT1042848B/en active
- 1975-09-30 FR FR7529895A patent/FR2286661A1/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104764964A (en) * | 2015-04-21 | 2015-07-08 | 华北电力大学 | High-capacity high-frequency power transformer analysis method and device |
| CN104764964B (en) * | 2015-04-21 | 2018-04-10 | 华北电力大学 | Large Copacity high frequency power transformer analysis method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| IT1042848B (en) | 1980-01-30 |
| FR2286661A1 (en) | 1976-04-30 |
| FR2286661B1 (en) | 1978-06-23 |
| DE2447105A1 (en) | 1976-04-08 |
| DE2447105B2 (en) | 1978-08-24 |
| DE2447105C3 (en) | 1979-04-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |