GB878349A - Controlled-blocking oscillator - Google Patents
Controlled-blocking oscillatorInfo
- Publication number
- GB878349A GB878349A GB5713/58A GB571358A GB878349A GB 878349 A GB878349 A GB 878349A GB 5713/58 A GB5713/58 A GB 5713/58A GB 571358 A GB571358 A GB 571358A GB 878349 A GB878349 A GB 878349A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pulse
- controlled
- reactor
- blocking oscillator
- voltage
- 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
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
- H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
- H03K3/04—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback
- H03K3/16—Generators characterised by the type of circuit or by the means used for producing pulses by the use, as active elements, of vacuum tubes only, with positive feedback using a transformer for feedback, e.g. blocking oscillator with saturable core
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
878,349. Valve pulse generating circuits. STANDARD TELEPHONES & CABLES Ltd. Feb. 21, 1958 [Feb. 26, 1957], No. 5713/58. Class 40(6) The voltage/time integral of a pulse from a blocking oscillator is controlled by an electromagnetic device having a low and a high impedance state connected across the secondary winding of the feedback transformer. Fig. 1 shows a free-running blocking oscillator in which the area of the output pulse is controlled by a saturable reactor SR comprising a tape-wound core of ferrite, permalloy or a silicon or nickel alloy preferably with a rectangular hysterisis loop. The normal voltage/time pulse integral is more than half the saturation flux/turns product, The anode current builds up rapidly due to the regenerative feedback until the reactor SR saturates, preventing further increase in current and regeneratively cutting off the valve. During the pulse, D1 clamps the grid to earth, the voltage induced at point A charging capacitor C to a voltage -VB so that the valve remains cut off until C has discharged via R and R1. The diodes D1, D2 stabilize the pulse recurrence frequency and amplitude. Since the pulse time integral is also stabilized by the saturable reactor SR, the duration is effectively stabilized. The sawtooth waveform across C may be used as a time base. Modifications.-In Fig. 4 (not shown) the output is developed across a cathode resistor and a different biasing arrangement is used. Fig. 5 shows a blocking oscillator in which the pulse duration is determined by switching in one of saturable reactors SR1, SR2, SR3. The amplitude is controlled by adjustment of tappings on the source GDB. Continuous control of duration may be obtained by adjustment of a D.C. bias on the core of the reactor SR as in Fig. 8, which shows the reactor split into two cores having a common D.C. biasing winding DCW. The D.C. bias may be controlled by a current proportional to a slowly varying magnitude to compensate for variation in said magnitude. The amplitude-controlling source -VB may be replaced by a Zener diode. The amplitudecontrolling diode D2 may be replaced by a gas tube or a varistor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL214914 | 1957-02-26 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB878349A true GB878349A (en) | 1961-09-27 |
Family
ID=19750837
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5713/58A Expired GB878349A (en) | 1957-02-26 | 1958-02-21 | Controlled-blocking oscillator |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE565123A (en) |
| GB (1) | GB878349A (en) |
| NL (2) | NL104941C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2041174A1 (en) * | 1969-04-15 | 1971-01-29 | Ericsson Telefon Ab L M |
-
0
- NL NL214914D patent/NL214914A/xx unknown
- BE BE565123D patent/BE565123A/xx unknown
- NL NL104941D patent/NL104941C/xx active
-
1958
- 1958-02-21 GB GB5713/58A patent/GB878349A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2041174A1 (en) * | 1969-04-15 | 1971-01-29 | Ericsson Telefon Ab L M |
Also Published As
| Publication number | Publication date |
|---|---|
| BE565123A (en) | |
| NL214914A (en) | |
| NL104941C (en) |
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