Back to results
US 8,525,511 B2Granted
Time division multiplexed detector for a magneto-optical current transducer
AssigneeABB Technology AG
InventorsRobert M. Synder, Lenny Roland, Robert C. Miller, Anton Poeltl, Michael Mendik
Life of this patent
Estimating the term…
Abstract
A system monitors alternating current and includes a magneto-optical current transducer (MOCT) adapted to modulate an optical signal corresponding to magnitude of the alternating current. Beam splitters are in communication with the MOCT which are in turn connected to respective channels. Each channel includes an LED that is powered by a constant current source.
Claims10
A system for monitoring an alternating current comprising:
- a magneto-optical current transducer adapted to modulate an optical signal corresponding to the magnitude of the alternating current, said transducer includes a first output and a second output and a first input and a second input;
- a first and a second beam splitter being in communication with said first and said second output respectively;
- a first and a second channel being in communication with said first and said second beam splitter respectively;
- said first channel including a first LED and said second channel including a second LED, said first LED in communication with said second beam splitter and said second LED in communication with said first beam splitter, said first channel including a first output and said second channel including a second output;
- a difference amplifier connected to said first and said second channel outputs to subtract said first and said second channel outputs from one another to eliminate vibration induced disturbance, and outputting a subtracted signal at an amplifier output;
- and
- wherein said first and said second LEDs are powered by a constant current source.
4 more elements
A system for monitoring an alternating current comprising:
- a magneto-optical current transducer adapted to modulate an optical signal corresponding to the magnitude of the alternating current, said transducer includes a first output and a second output and a first input and a second input;
- a first and a second beam splitter being in communication with said first and said second output respectively;
- a first and a second channel being in communication with said first and said second beam splitter respectively;
- said first channel including a first LED and said second channel including a second LED, said first LED in communication with said second beam splitter and said second LED in communication with said first beam splitter, said first channel including a first output and said second channel including a second output, each said channel includes an integrator circuit and a sample and hold circuit, said integrator circuit collecting a sample charge proportional to the magnitude of the alternating current over a sample period and said sample and hold circuit connected to said integrator circuit and holding said sample charge during the duration of the other of said first or said second channel sample period;
- a difference amplifier connected to said first and said second channel outputs to subtract said first and said second channel outputs from one another to eliminate vibration induced disturbance, and outputting a subtracted signal at an amplifier output.
2 more elements
Dependencies are inferred from the claim text.