BRPI1102753A2 - optical pickup cable - Google Patents

Abstract

APTICAL CAPTOR CABLE. An optical pickup cable for calibrating electric meters is described that eliminates light interference from the medium, increasing the reliability of the measurement, said cable comprising a phototransistor (10) that captures the energy pulse of the electric meter; a resistor-capacitor circuit in the photocurrent amplifier feedback loop (20) that amplifies the photocurrent provided by the phototransistor (10); a saturation controller (30) that controls the current supplied by the current amplifier (20); a High Pass filter (40) that eliminates low frequency signals on the order of 120 Hz from the current amplifier (20); a subtractor circuit (50) that measures the signal difference in the photocurrent amplifier feedback loop (20), a Deboucing block (60) that receives the electrical signal and compares with offset levels to provide pulses at the output of the bistable block (70) only when the signal crosses the upper and lower levels of the schimitt-trigger comparator circuit, and an optical port (80) that sends the electrical signal to the computer.

Description

POνΕΝζϊΑΟ FIELD OPTICAL CAPTOR CABLE

The present invention describes an optical pickup cable. More specifically it comprises an optical pickup cable for calibrating electric energy meters that eliminates light interference from the medium, increasing the reliability of the medication.

ΙΝνΕΝςΑΟ BACKGROUND

The reading of electrical energy meters is performed by optical cables that pick up the energy pulse of the meter and transform it into an electrical signal to be sent to the computer in order to perform the calibration of the meter, where the computer checks the pulses. and with the pulses the meter is sending.

However, the optical cable conventionally used for these measurements suffers light interference from the medium, which interferes with the reliability of the medication, as in the manufacturing environment there are many sources that emit light flux that impair the sensitivity of the pickup.

Thus, the object of the present invention is an optical pickup cable which improves the performance of the acquisition of electrical energy meter signals by eliminating the low frequencies and interference of the medium, such as solar and electric light, said cable provided with a filter that It is based on signal variation and a level comparator that stops against the average signal value to eliminate ambient light interference. SUMMARY

Characteristic of the invention is an optical pickup cable which increases the reliability of signal metering of electric power meters by including a filter and level comparator to eliminate ambient light interference.

Characteristic of the invention is an optical device that senses the luminous pulses of energy emitted by the energy meter and provides a reliable electrical signal as it has the ability to eliminate light interference from artificial sources in the medium. BRIEF DESCRIPTION OF THE FIGURES

Figure 1 shows the schematic representation of the optical pickup cable circuit blocks. DETAILED DESCRIPTION OF THE INVENTION

The optical pickup cable, object of the present invention, comprises a cable suitable for capturing the pulse of energy from electrical energy meters and transforming it into an electrical signal to be sent to a computer to calibrate said meter. The optical pickup cable has ends provided with connectors suitable to be coupled at one end to the power meter and opposite to a computer, said cable provided with a voltage regulator (1) that provides a regulated voltage to the other blocks of the circuit and protects against polarity reversal in the supply.

The optical pickup cable, coupled between an electric power meter and a computer, picks up the power pulse of the meter via a phototransistor (10).

The captured energy pulse presents a fast variation, in the order of 20pS. This pulse of energy feeds back into the circuit by draining a portion of the photocurrent into the ground. Thus, the feedback is large for slow varying signals, and small for fast varying signals due to the low pass filter RC present in the feedback loop of the photocurrent amplifier (20).

Signals from the illumination of incandescent, fluorescent, solar light, varying slower than the power pulse, are filtered through a resistor-capacitor circuit in the photocurrent amplifier feedback loop 20, which amplifies the supplied photocurrent. by the phototransistor (10), so that small variations can be perceived by the resistor capacitor circuit.

The current supplied by the current amplifier (20) is controlled by a saturation controller (30) to avoid saturating the signal supplied to the subtractor circuit (50).

A High Pass filter (40) eliminates low frequency signals of the order of 120 Hz in order to make the amplification circuit immune to ambient light.

In the subtractor circuit (50) the signal difference in the feedback loop of the photocurrent amplifier (20) is measured, which responds according to the derivative of the optical signal of the order of δΟμν / μΑΟΟ.

Next, the electrical signal passes through the Deboucing block (60), where it is compared to offset levels, so as to provide pulses at the output of the bistable block (70) only when the signal crosses the upper and lower levels of the schimitt comparator circuit. -trigger.

The luminous pulse of energy is transformed into an electrical signal through the optical pickup cable and is sent to the computer via an optical port (80).

Claims (1)

1. OPTICAL CAPTING CABLE with ends fitted with suitable connectors to be coupled at one end to an electrical energy meter and at the opposite end to a computer, characterized by: a) a voltage regulator (1) which provides a regulated voltage for the other blocks of the circuit; b) a phototransistor (10) which captures the energy pulse of the electric energy meter; c) a resistor-capacitor circuit in the photocurrent amplifier feedback loop (20) that amplifies the photocurrent provided by the phototransistor (10); d) a saturation controller (30) that controls the current supplied by the current amplifier (20); e) a High Pass filter (40) that eliminates low frequency signals on the order of 120 Hz from the current amplifier (20); f) a subtractor circuit (50) that measures the signal difference in the feedback loop of the photocurrent amplifier (20); g) a Deboucing block (60) that receives the electrical signal and stops with offset levels to provide pulses at the output of the bistable block (70) only when the signal crosses the upper and lower levels of the schimitt-trigger comparator circuit; h) an optical port (80) that sends the computer the electrical signal.