Pulse modulator gating circuit with trailing edge control
AssigneeHughes Aircraft Company
InventorHarold Zaslav
Life of this patent
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Abstract
Herein disclosed is a new and improved pulse modulator comprisng first current gating means for applying a current through a first primary lead of a current transformer during the duration of an applied control signal pulse and second current gating means for applying an oppositely directed current through a second primary lead of the transformer. The current flow through the second primary lead commences at the trailing edge of the control signal pulse and produces a flux which cancels the flux produced by the current through the first primary lead; whereby a high voltage output pulse is produced across the secondary winding of the transformer which accurately reproduces the duration of the applied low voltage control signal pulse.
Claims10
A pulse modulator for applying a pulse of energy to a load circuit during the duration of an applied control signal pulse, said pulse modulator comprising:
- a transformer having a secondary winding adapted for being coupled across said load circuit, and first and second primary elements;
- first means for applying a first current through the first primary element of said transformer during the duration of said control signal pulse;
- second means for applying a second current through the second primary element of said transformer so as to produce a flux which is in opposition to the flux resulting from the current through said first primary element and such that said second current through the second primary winding commences with the trailing edge of said control signal pulse;
- and
- wherein said first means includes a circuit arrangement having current gating means for responding to the leading edge of said control signal pulse for commencing the application of said first current, positive feedback means responsive to the said first current for increasing the value thereof, and negative feedback means responsive to said second current for terminating the flow of said first current;
- whereby an output pulse is produced across the secondary winding during the duration of said control pulse signal.
A pulse modulator for applying a high voltage pulse of energy to a load circuit during a period defined by a low voltage applied control signal pulse, said pulse modulator comprising:
- an output transformer having a secondary winding adapted for being coupled across said load circuit, and first and second primary leads;
- first means for applying a first current through the first primary lead of said output transformer during the duration of said control signal pulse;
- second means for applying a second current through the second primary lead of said output transformer so as to produce a flux which is opposition to the flux resulting from said first current, said second means includes means for commencing said second current flow upon the occurrence of the trailing edge of said control signal pulse;
- and
- wherein said first means includes current gating means for commencing the flow of first current upon the leading edge of said control signal pulse, positive feedback means responsive to said first current for increasing the value thereof and negative feedback means responsive to said second current for terminating the flow of said first current;
- whereby a high voltage output pulse is produced across the secondary winding of said output transformer during the duration of said control pulse signal.
Dependencies are inferred from the claim text.