Non-contact type sensor driven from a single power supply for al

Details Non-contact type sensor driven from a single power supply for al Non-contact type sensor driven from a single power supply for al

1997-03-17

1999-04-20

Nguyen, Vinh P.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Magnetic saturation

G01R 1900

Patent

active

058960287

ABSTRACT:
An input sensor voltage is stepped up to a predetermined sensor voltage by a step-up single power supply circuit 30. The voltage thus stepped up is supplied to a first differential amplifier circuit 40, a first current buffer 50 and a constant voltage circuit 60. Either first or second transistor in the first current buffer 50 is turned on in accordance with a voltage difference across a Hall element 3 provided in a gap in a magnetic core of a coil 1. A current proportionate to a voltage from the first differential amplifier circuit 40 is output from the output terminal of the first current buffer 50 through a secondary winding 1c, a resistor RL and the constant voltage circuit 60 in the direction opposite to that of the current in a primary winding 1b to balance a magnetic flux in the coil 1. The constant voltage circuit 60 maintains a voltage at its output at a reference voltage.

REFERENCES:
patent: 5146156 (1992-09-01), Marcel
patent: 5654630 (1997-08-01), Shimoyama et al.

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