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EP0164752A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Power switching circuit for a pulsed laser

Assignee: BRITT CORP
•
Filing: 1985-06-12
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Granted: —
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Expires: 2005-06-12
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Abstract

Abstract A power switching circuit for providing variable pulse width drive signals for a laser in response to pulsed control signals. The power switching circuit includes a ferroresonant transformer circuit (300) and a power transistor output circuit (322, 324, 326). The ferroresonant transformer circuit (300) comprises a first pair of primary windings (302, 304) coupled to input terminals (301, 303) through a switch (306) and an associated pair of secondary windings (312, 314) coupled to the output circuit (322, 324, 326) to apply switching signals thereto. The transformer circuit (300) further includes a second pair of primary windings (308, 310) coupled through a resistor to the input terminals (301, 303) with a polarity opposite that of the first pair. The transistor outputcircuit (322, 324, 326) includes three power transistors (330) arranged in parallel with their bases coupled to the transformer circuit secondary windings (312, 314) and their collectors coupled to the laser tube cathode.

Inventors

  • 👤 Dale G. O'harra Ii

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-27 14:28
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/12; H01; H01S; H01S3/00; H01S3/09; H01S3/097; H03K17/51; H03K17/56; H03K17/60; H03K17/601

Claims Analysis

Total Claims: 10
Claim 1
Independent Claim 44 words
A power switching circuit for providing pulsed drive signals for a laser in response to pulsed control signals comprising: a power transistor output circuit coupled to said laser; and a ferroresonant transformer circuit for providing variable pulse width switching signals to said output circuit.
Claim 2
Dependent Claim 44 words
A power switching circuit for providing pulsed drive signals for a laser in response to pulsed control signals comprising: a power transistor output circuit coupled to said laser; and a ferroresonant transformer circuit for providing variable pulse width switching signals to said output circuit.
Claim 3
Dependent Claim 14 words
The power switching circuit of Claim 1 wherein said pulsed laser is air cooled.
Claim 4
Dependent Claim 22 words
The power switching circuit of Claim lor 2 wherein said pulse widths are variable over a range at least four to one.
Claim 5
Dependent Claim 16 words
The power switching circuit of claim 3 wherein said maximum pulse width is approximately 120 µsec.
Claim 6
Dependent Claim 94 words
The ferroresonant transformer circuit of Claim 1 wherein said circuit further comprises: input terminals coupled to a power source; a first pair of primary windings coupled _ through a switch to said input terminals, said switch responsive to said control signals; a pair of secondary windings associated with said first pair of primary windings and coupled to said output circuit; and a second pair of primary windings coupled to said input terminals with a polarity opposite to that of said first pair for continuously biasing said ferroresonant transformer circuit toward saturation in one direction.
Claim 7
Dependent Claim 37 words
The ferroresonant transformer circuit of Claim 5 wherein said circuit further comprises a resistor in parallel with each of said'primary windings of said first pair for adjusting the shape of the trailing edge of said switching signals.
Claim 8
Dependent Claim 41 words
The transistor output circuit of Claim 1 wherein said output circuit further comprises a plurality of power transistors arranged in parallel with their collectors coupled to a cathode of said laser, and their bases coupled to said pair of secondary windings.
Claim 9
Dependent Claim 42 words
The transistor output circuit of Claim 7 wherein said output circuit further comprises shielding means coupled across the collector-emitter output of said parallel transistors for shielding said transistors from energy reflections caused by any inductance in the anode lead of the laser.
Claim 10
Dependent Claim 25 words
The transistor output circuit of Claim 8 wherein said shielding means further comprises a clamping circuit including a capacitor and diode located proximate said transistors.

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