Circuit for injecting simulating-noise signals in a power line

Details Circuit for injecting simulating-noise signals in a power line Circuit for injecting simulating-noise signals in a power line

1981-03-13

1983-11-22

Grimm, Siegfried H.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

307108, 331 78, 340310R, H03K 353

Patent

active

044172079

ABSTRACT:
A simulated-noise signal is injected in the power line of equipment under test without loss of AC power by the use of a series resonance circuit having a resonance frequency equal to the frequency of the AC power supply. The series resonance circuit is connected in the power line in parallel with the equipment, and a capacitor is connected to the power line in parallel with the series resonance circuit and the equipment. A switching element is used to short-circuit the resonance circuit when noise simulation is not carried out. For the simulation of lightening strikes the circuit further comprises a simulated-noise signal generator including a capacitor charged by a DC power supply, a first switching element to discharge the charge of the capacitor to the equipment, and a second switching element for establishing a by-pass of the discharging current. By closing the second switching element after the first switching element is closed, a square-wave signal is fed to the equipment. In order to simulate ringing-surge signals, the circuit includes a generator to generate a damped-wave signal similar to a ringing signal. This generator has a capacitor charged by a DC power supply, a switching element for discharging the charge of the capacitor to the equipment, and an inductance coil connected to the discharging circuit. When the switching element is closed, a damped-wave signal is fed to the equipment.

REFERENCES:
patent: 2385673 (1945-09-01), Woodworth
patent: 3657555 (1972-04-01), Hoffman
patent: 3909821 (1975-09-01), Jagoda et al.
Griffing, "A High Voltage Pulse Generator for Acoustoelectric Studies", Review of Scientific Instruments, vol. 45, No. 7, Jul. 1974, pp. 964-965.

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