Electrical transmission or interconnection systems – Nonlinear reactor systems – Parametrons
Patent
1987-09-11
1989-07-25
Heyman, John S.
Electrical transmission or interconnection systems
Nonlinear reactor systems
Parametrons
307227, 307261, 307519, 307490, 328181, 328 35, 328 36, 328186, H03K 402, H03K 408
Patent
active
048517097
ABSTRACT:
A variable frequency, fixed amplitude digital sweep generator for use with a cathode ray tube based instrument useful in troubleshooting, diagnosing, and servicing spark ignition internal combustion engines. A first counter (8) measures the period between the leading edges of a trigger pulse, V.sub.T, derived from the ignition system of an internal combustion engine by counting divided down clock pulses. A comparator (10) compares the count of the first counter (8) to the count of a second counter (11), which is clocked at a rate which is an integral multiple of the clock rate of the first counter (8). The comparator (10) produces an output pulse when the output of the two counters (8, 11) match. Each comparator pulse causes a monostable multivibrator (17) to produce a rectangular wave, V.sub.M. The constant width rectangular waves, V.sub.M, are integrated by an integration circuit (14) that produces a stair step waveform, V.sub.I, which is smoothed by a filter circuit (15) and an error signal feedback circuit (16) to create a linear ramp signal, V.sub.O, having the same frequency as the frequency of the trigger pulse, V.sub.T. Since the comparator (10) produces the same number of pulses between trigger pulses, V.sub.T, regardless of the frequency of the trigger pulses, V.sub.T, the amplitude of the linear ramp (sawtooth) output, V.sub.O, of the digital sweep generator is constant.
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Heyman John S.
Pacific Northwest Eectronics
Thai Nancy
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