US3928809A
Expired / Lapsed
US
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Pulse width control system
Assignee: Whittaker Corp
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Filing: 1974-05-06
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Granted: 1975-12-23
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Expires: 1994-05-06
Abstract
Abstract A magnetic modulator for pulsed magnetrons is provided in which the width of the modulating pulse is continuously variable over a predetermined range and is automatically controlled at a predetermined width by reason of a novel feedback loop utilizing rectified RF output pulses to change the operating point on the B-H characteristic loop of a saturable core reactor and hence to change the time required to switch the reactor into a saturated condition in which the voltage applied to the magnetron falls below the magnetron''s requirement for oscillation. The residual energy not consumed by the magnetron is dissipated in a heat sink or stored for the powering of subsequent pulses applied to the magnetron.
Inventors
- 👤 Dennis E Tschudi
- 👤 Richard H Geordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:46
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/30; H03C3/32; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
107 words
A pulse width control system including: means for generating a pulse of a first width, said generating means having output means adapted for coupling to a load; means for deriving pulses corresponding to the pulses supplied to said load; converting means for converting the widths of pulses from said deriving means to voltages representative of such widths; pulse with reference means; and automatic means coupled to said output means and responsive to a combination of the voltages from said reference and converting means, respectively, to determine what portion of the width of said pulse of a first width is coupled from said output means to said load.
Claim 2
Dependent Claim
107 words
A pulse width control system including: means for generating a pulse of a first width, said generating means having output means adapted for coupling to a load; means for deriving pulses corresponding to the pulses supplied to said load; converting means for converting the widths of pulses from said deriving means to voltages representative of such widths; pulse with reference means; and automatic means coupled to said output means and responsive to a combination of the voltages from said reference and converting means, respectively, to determine what portion of the width of said pulse of a first width is coupled from said output means to said load.
Claim 3
Dependent Claim
122 words
Apparatus according to claim 1 in which said automatic means includes a reactor having a saturable core and first and second windings, said first winding being coupled to said converting means and to said reference means and being responsive to a combination of the voltages from said reference means and said converting means, respectively, to control the reset operating point on the B-H loop of said saturable core, said second winding being coupled to said pulse generating means and to said output means and being responsive to said pulse of a first width from said generating means to cause saturation of said core at a time following the initiation of said pulse of a first width determined by said reset operating point.
Claim 4
Dependent Claim
40 words
Apparatus according to claim 2 in which said means for generating a pulse of a first width is coupled to said load along a path and said second winding of said reactor is coupled in shunting relationship to said path.
Claim 5
Dependent Claim
57 words
Apparatus according to claim 2 in which said means for generating a pulse of a first width is coupled to said load along a path and said second winding of said reactor is coupled across said path in a circuit including means capable of diverting from said load a portion of said pulse of a first width.
Claim 6
Dependent Claim
25 words
Apparatus according to claim 1 in which said load is a generator of RF signals and said means for deriving pulses includes an RF detector.
Claim 7
Dependent Claim
14 words
Apparatus according to claim 5 in which said RF signal generator is a magnetron.
Claim 8
Dependent Claim
20 words
Apparatus accorDing to claim 1 in which said reference means includes a conductor carrying a pulse have a reference width.
Claim 9
Dependent Claim
16 words
Apparatus according to claim 1 in which said reference means includes means for generating digital signals.
Claim 10
Dependent Claim
20 words
Apparatus according to claim 1 in which said converting means includes means for quantizing the pulses from the deriving means.
Claim 11
Dependent Claim
14 words
Apparatus according to claim 9 in which said pulse quantizing means includes an oscillator.
Claim 12
Dependent Claim
24 words
Apparatus according to claim 2 in which said pulse width reference means is a source of pulse width control voltage of continuously variable magnitude.
Claim 13
Dependent Claim
22 words
Apparatus according to claim 3 further including an energy dissipating sink coupled in series with said secondary winding in said shunting circuit.
Claim 14
Dependent Claim
27 words
Apparatus according to claim 12 in which said sind is resistive in character and the magnitude of its resistance corresponds to the characteristic impedance of said load.
Claim 15
Dependent Claim
52 words
Apparatus according to claim 2 in which said means for generating a pulse of a first width includes an energy storage capacitor coupled through a saturable core transformer to a pulse forming network and a control element for controlling discharge of said storage capacitor through one winding of said saturable core transformer.
Claim 16
Dependent Claim
49 words
Apparatus according to claim 14 in which the time required for reaching saturation of the core of said saturable reactor at the minimum reset operating point on the B-H loop of said saturable core is equal to at least twice the one-way delay time of said pulse forming network.
Claim 17
Dependent Claim
52 words
Apparatus according to claim 11 which includes, in addition, combining means coupled to said converting means and to said source of control voltage for producing a combination of the voltages from said reference means and said converting means to control the reset operating point on the B-H loop of said saturable core.
Claim 18
Dependent Claim
18 words
Apparatus according to claim 16 in which said combining means comprises an inverting operational amplifier with current feedback.
Claim 19
Independent Claim
115 words
A system for controlling the width of pulses from a pulse generator comprising, in combination: a pulse generator having the capability of generating pulses of controllable width; drive means coupled to trigger the pulse generator; predeterminable pulse width control means coupled to provide a signal to the drive means to control the triggering of the pulse generator; and a pulse width detector coupled between an output of the pulse generator and an input of the control means; the control means including means for comparing the output of the pulse width detector with a predetermined condition of the control means and controlling the signal to the drive means in accordance with the result of said comparison.
Claim 20
Independent Claim
115 words
A system for controlling the width of pulses from a pulse generator comprising, in combination: a pulse generator having the capability of generating pulses of controllable width; drive means coupled to trigger the pulse generator; predeterminable pulse width control means coupled to provide a signal to the drive means to control the triggering of the pulse generator; and a pulse width detector coupled between an output of the pulse generator and an input of the control means; the control means including means for comparing the output of the pulse width detector with a predetermined condition of the control means and controlling the signal to the drive means in accordance with the result of said comparison.
Claim 21
Dependent Claim
51 words
A system in accordance with claim 18 wherein the drive means comprises a device having a variable operating point and a response corresponding to the position of said operating point within the operating range of the device, said operating point being variable in accordance with the signal from the control means.
Claim 22
Dependent Claim
34 words
A system in accordance with claim 19 wherein said device comprises a saturable reactor having an operating point variable over the B-H characteristic curve in response to the signal applied from the control means.
Claim 23
Dependent Claim
49 words
A system in accordance with claim 20 further including circuitry coupled to the control means and the drive means such as to drive the saturable reactor into saturation and thereby terminate the output signal therefrom at a time coincident with the termination of the signal to the drive means.
Claim 24
Dependent Claim
28 words
A system in accordance with claim 21 further including a pulse forming network coupled to drive said saturable reactor from a preset operating point to a saturated condition.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |