GB1308284A - Self-biased class c oscillators - Google Patents
Self-biased class c oscillatorsInfo
- Publication number
- GB1308284A GB1308284A GB310271A GB1308284DA GB1308284A GB 1308284 A GB1308284 A GB 1308284A GB 310271 A GB310271 A GB 310271A GB 1308284D A GB1308284D A GB 1308284DA GB 1308284 A GB1308284 A GB 1308284A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- inductor
- transistor
- parallel
- base
- 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
- 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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5383—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a self-oscillating arrangement
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
- H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
- H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
- H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
- H03B5/1296—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the feedback circuit comprising a transformer
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Circuit Arrangements For Discharge Lamps (AREA)
- Inverter Devices (AREA)
Abstract
1308284 Supply systems for consuming devices THORN ELECTRICAL INDUSTRIES Ltd 25 Jan 1972 [25 Jan 1971] 3102/71 Heading H2H [Also in Division H3] A class-C oscillator driving a fluorescent tube 60 produces half-sinusoid collector current pulses in a transistor 11 whose two main path electrodes 12, 15 are connected to respective supply terminals, one connection being through a parallel tuned circuit 13 and also a series tuned circuit, the parallel tuned circuit having a lower frequency than the series one, and including an inductor 203 which is coupled to a feedback winding 18 connected between the base 17 and a bias capacitor 25, whose value is N1/N2.I B /I C .C; where C is the parallel lined circuit capacitance 22a, N1 and N2 are the numbers of turns on the said inductor and feedback windings 20a, 18, and I B and I C are the peak base and collector currents. The ratio I C /I B is between 3 and 10. The series tuned circuit is formed by an inductor 21, which could be the leakage inductance of the transformer 23 whose primary constitutes the parallel tuned circuit inductance 20a, and a capacitance formed by the effective capacitance presented by the parallel circuit between the collector and the point of connection of the inductor 21. For a parallel tuned frequency (output frequency) of 20 KHZ, a series tuned frequency of 30 KHZ is selected to give the best compromise between peak transistor current and optimum current pulse shape, the latter also being controllable (44b, 44d, 44f, Fig. 3, not shown) by selection of resistors 27, 31. Diodes 30, 32 protect the transistor, and a diode 28 discharges the negative voltage built up on C25 during each cycle. Transients are suppressed by L63, C64, C65, R66, and the ferrite cored transformer 23 drives the fluorescent tube 60, or an electroluminescent panel (68, Fig. 6, not shown), in the latter case a PNP transistor being used. An inductor (67, Fig. 6, not shown) in the base circuit produces a reverse bias at the base to compensate for storage time (t s , Fig. 4, not shown) in the transistor. A push-pull circuit (Fig. 7, not shown) employs two transistors whose collectors are connected to opposite ends of the transformer 23 primary (20b, 20c), and circuitry basically similar to Fig. 5.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB310271 | 1971-01-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1308284A true GB1308284A (en) | 1973-02-21 |
Family
ID=9751978
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB310271A Expired GB1308284A (en) | 1971-01-25 | 1971-01-25 | Self-biased class c oscillators |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB1308284A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2432761A1 (en) * | 1973-07-30 | 1975-02-13 | Thorn Electrical Ind Ltd | OSCILLATOR WORKING IN C MODE WITH AUTOMATIC PRELOAD |
GB2248985A (en) * | 1990-08-24 | 1992-04-22 | Coolite Ltd | High frequency fluorescent tube driver |
GB2325798A (en) * | 1997-05-28 | 1998-12-02 | Miniflame Ltd | Mains powered supply for driving electroluminescent material |
GB2334639A (en) * | 1998-02-19 | 1999-08-25 | Zetex Plc | Cold cathode fluorescent lamp driver |
-
1971
- 1971-01-25 GB GB310271A patent/GB1308284A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2432761A1 (en) * | 1973-07-30 | 1975-02-13 | Thorn Electrical Ind Ltd | OSCILLATOR WORKING IN C MODE WITH AUTOMATIC PRELOAD |
GB2248985A (en) * | 1990-08-24 | 1992-04-22 | Coolite Ltd | High frequency fluorescent tube driver |
GB2248985B (en) * | 1990-08-24 | 1994-08-03 | Coolite Ltd | Fluorescent tube driver |
GB2325798A (en) * | 1997-05-28 | 1998-12-02 | Miniflame Ltd | Mains powered supply for driving electroluminescent material |
GB2334639A (en) * | 1998-02-19 | 1999-08-25 | Zetex Plc | Cold cathode fluorescent lamp driver |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] | ||
PCNP | Patent ceased through non-payment of renewal fee |