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US 5,994,689 AGranted
Photoelectric cell with stabilised amplification
AssigneeSchneider Electric SA
InventorPierre Charrier
Life of this patent
Estimating the term…
Abstract
A photoelectric cell having a receiving section fitted with an amplifier processing circuit for making the cell immune to electrical disturbances. The processing circuit uses a transfer impedance amplifier A having a gain loop 24 which is shunted by a short-circuit path 24A including a switch T1 controlled by the transmission signal E1. The switch T1 conducts when no pulses are delivered from the transmission signal E1 and does not conduct when pulses are received from the transmission signal E1.
Claims3
A photoelectric cell structure comprising:
- a transmitting assembly for generating a pulsed transmission signal (E1) and including a light-emitting component for receiving said pulse transmission signal;
- a receiving assembly including a light-receiving component and a processing circuit for processing a reception signal output from said light-receiving component wherein said processing circuit includes an amplifier device having a first input for receiving said reception signal and an output which provides a voltage signal (S1) said receiving assembly further including a shaping device receiving said voltage signal and providing a switching signal (S), and wherein
- said amplifier device is a transfer impedance amplifier circuit including a gain loop and a short-cut path in parallel with said gain loop wherein said short-cut path includes a first switch controlled by said pulsed transmission signal (E1) whereby said switch does not conduct when pulses of said pulsed transmission signal are present but said switch does conduct when no pulses from said pulse transmission signal are present.
Dependencies are inferred from the claim text.