US3700928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fast pulldown transmission line pulser
Assignee: Westinghouse Electric Corp
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Filing: 1969-07-30
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Granted: 1972-10-24
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Expires: 1989-07-30
Abstract
Abstract A switching transistor is used to pulse a high voltage radar transmission tube on and off. Each time the switching transistor turns off, positive feedback is applied thereto by a pulldown transistor to steepen the trailing edge of the switching transistor output pulse and overcome the inherent delay in transistor turn off due to storage effects. The pulldown transistor is responsive to voltages generated by the transient component of the trailing edge of the switching transistor, and therefore applies the feedback just as the switching transistor starts to turn off. The pulldown feedback is effective immediately because its application is limited only by the relatively short turn on time of the pulldown transistor. Transformers of the transmission line multifilar toroid type or of the loop coupling toroid type are employed to generate a high voltage pulse for controlling the radar transmission tube at its grid or cathode.
Inventors
- 👤 Walter E Milberger
- 👤 Wayne L Weigle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:27
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60; H03K17/64; H03K5/00; H03K5/01; H03K5/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A pulser circuit responsive to an input pulse signal for supplying to a load an output pulse signal having a steep trailing edge, comprising in combination: a switching stage having an input terminal means for receiving said input pulse, and having an output which is adapted to be in electrical communication with said load; a pulldown stage operable to be turned on by a signal generated in response to the trailing edge of said output pulse signal; means for electrically coupling the output of said pulldown stage to the output of said switching stage for supplying positive feedback to the output of said switching stage during the presence of said output pulse signal; and high pass filter means for generating said signal generated in response to the trailing edge of said output pulse signal.
Claim 2
Dependent Claim
134 words
A pulser circuit responsive to an input pulse signal for supplying to a load an output pulse signal having a steep trailing edge, comprising in combination: a switching stage having an input terminal means for receiving said input pulse, and having an output which is adapted to be in electrical communication with said load; a pulldown stage operable to be turned on by a signal generated in response to the trailing edge of said output pulse signal; means for electrically coupling the output of said pulldown stage to the output of said switching stage for supplying positive feedback to the output of said switching stage during the presence of said output pulse signal; and high pass filter means for generating said signal generated in response to the trailing edge of said output pulse signal.
Claim 3
Dependent Claim
33 words
The video pulser circuit of claim 1, wherein the high pass filter comprises: a capacitor; and a signal developing impedance means electrically connected between the capacitor and the input of the pulldown stage.
Claim 4
Dependent Claim
27 words
The pulser circuit of claim 2, wherein the switching stage and the pulldown stage each comprise at least one transistor means having base, collector, and emitter electrodes.
Claim 5
Dependent Claim
63 words
The pulser circuit as specified in claim 3, wherein the high pass filter impedance means is a current step-up high gain bandwidth transmission line transformer electrically connected between said capacitor and the base electrode of the pulldown stage transistor for increasing the base drive current to the pulldown stage transistor and for developing the said signal on the base of the pulldown stage.
Claim 6
Dependent Claim
19 words
The pulser circuit of claim 3, wherein the switching stage comprises a plurality of transistor means operating in parallel.
Claim 7
Dependent Claim
53 words
The pulser circuit of claim 3, wherein the means for coupling feedback is a high gain bandwidth transformer comprising: a pulldown winding electrically connected to the output of the pulldown stage; and a switching winding electrically connected to the output of the switching stage and in magnetic flux communication with the pulldown winding.
Claim 8
Dependent Claim
53 words
The pulser circuit of claim 6, wherein the pulldown winding is electrically connected across the collector and emitter electrodes of the pulldown transistor for applying the proper supply voltage to the pulldown transistor which is induced into the pulldown winding from the switching winding during the transient portion of the switching stage output.
Claim 9
Dependent Claim
82 words
The pulser circuit of claim 6, wherein a first and a second fast acting switching device is connected between the collector electrode and base electrode of the switching transistor and the pulldown transistor respectively, the devices being responsive to the flyback voltages generated by changing magnetic fields in the switching winding and pulldown winding respectively to cause the respective transistor to turn on as the flyback voltage and current develops and pass the flyback energy through the respective transistor without damage thereto.
Claim 10
Dependent Claim
21 words
The pulser circuit of claim 6, wherein the transistors are normally off and are pulsed on by the pulser input pulse.
Claim 11
Dependent Claim
28 words
The pulser circuit of claim 6, wherein the high gain bandwidth transformer is a transmission line transformer having step-up secondary adapted to be electrically connected to the load.
Claim 12
Dependent Claim
31 words
The pulser circuit of claim 6, wherein the high gain bandwidth transformer is a loop coupling transformer having a step-up secondary which is adapted to be electrically connected to a load.
Claim 13
Dependent Claim
35 words
The pulser circuit of claim 6, wherein the switching stage comprises a plurality of transistor switching devices operating in parallel, and a plurality of switching windings are provided one connected to each switching device output.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |