Unity gain filter for current transformer

Details Unity gain filter for current transformer Unity gain filter for current transformer

1994-03-01

1996-05-21

Deboer, Todd

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 93, H02H 308

Patent

active

055195601

ABSTRACT:
An electrical device such as an electrical contactor interfaces at least one alternating current transformer having an output providing a signal proportional to changes in alternating current and includes at least one filter for filtering the output signal of the transformer. Each of the filters have an input connected to the transformer and an output having a signal proportional to the transformer output signal and inversely proportional to selected frequencies of the alternating current. The electrical device also has means for determining a value related to the alternating current using the output of each of the filters. The filter may have a resistor and a capacitor for filtering the transformer output signal in order that the filter is a low-pass filter. Alternatively, the filter may be a band-pass filter. The electrical device may include a microcomputer having an integrating capacitor and an analog-to-digital converter for converting the output of each of the filters to a digital value related to, or equal to, the alternating current. Alternatively, the electrical device may have a rectifier for inverting an output signal of each of the filters and a summer for summing only one polarity of the output signal and the inverted output signal in order that the output value is an analog value related to, or equal to, the alternating current. The alternating current may have a silicon controlled rectifier chopped waveform.

REFERENCES:
patent: 4482852 (1984-11-01), Muskovac
patent: 4933801 (1990-06-01), Glennon et al.
patent: 4943766 (1990-07-01), Suzuki
patent: 5270898 (1993-12-01), Elms et al.

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