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Bipolar Pulse Generator

IP.com Disclosure Number: IPCOM000089860D
Original Publication Date: 1968-Dec-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Grzyb, JD: AUTHOR [+4]

Abstract

This circuit generates fast, high-current impulse pairs. A bipolar pulse, as in drawing 1, assures that a magnetic core returns to the zero axis on the B-H curve after each positive pulse. In drawing 2, pulse generator 10 drives variable delay and waveshaping circuits 20, 22, 24, and 26. These circuits provide a series of four trigger pulses. Two define the leading and trailing edges of a positive pulse. The other two define the leading and trailing edges of a negative pulse. Circuit 22 provides a positive pulse turnon. Circuit 20 provides a positive pulse turnoff. Circuit 24 provides a negative pulse turnon. Circuit 26 provides a negative pulse turnoff. The delays in each of these circuits are adjustable providing various desired widths and separations of the positive and negative pulses.

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Bipolar Pulse Generator

This circuit generates fast, high-current impulse pairs. A bipolar pulse, as in drawing 1, assures that a magnetic core returns to the zero axis on the B-H curve after each positive pulse. In drawing 2, pulse generator 10 drives variable delay and waveshaping circuits 20, 22, 24, and 26. These circuits provide a series of four trigger pulses. Two define the leading and trailing edges of a positive pulse. The other two define the leading and trailing edges of a negative pulse. Circuit 22 provides a positive pulse turnon. Circuit 20 provides a positive pulse turnoff. Circuit 24 provides a negative pulse turnon. Circuit 26 provides a negative pulse turnoff. The delays in each of these circuits are adjustable providing various desired widths and separations of the positive and negative pulses. Current switch 30 provides a positive pulse through NPN emitter-follower 50. Current switch 32 provides the negative pulse through PNP emitter-follower 52. Circuits 40 and 42 are positive and negative voltage clamps respectively. This circuit is useful for measuring the pulse magnetizing current of a core. The measurement is accomplished by current probe 60 without affecting the output pulse.

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