Importance

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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.

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