Circuit for injecting simulating-noise signals in a power line
First Claim
1. A circuit for injecting simulated-noise signals in an AC power line of electrical equipment under noise-simulating test, which comprises:
- series resonance means having a resonance frequency equal to the frequency of the AC power supply and connected in said AC power line to be in series with said electrical equipment;
a capacitor means connected to said AC power line in parallel with the serial connection of said electrical equipment and said series resonance means; and
means for generating a simulating-noise signal, the output of which is connected across said series resonance means.
1 Assignment
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Accused Products
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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Citations
8 Claims
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1. A circuit for injecting simulated-noise signals in an AC power line of electrical equipment under noise-simulating test, which comprises:
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series resonance means having a resonance frequency equal to the frequency of the AC power supply and connected in said AC power line to be in series with said electrical equipment; a capacitor means connected to said AC power line in parallel with the serial connection of said electrical equipment and said series resonance means; and means for generating a simulating-noise signal, the output of which is connected across said series resonance means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification