Photo-coupler apparatus

Details Photo-coupler apparatus Photo-coupler apparatus

1993-12-03

1996-05-07

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

External effect

Light

250551, H01L 3100

Patent

active

055149960

ABSTRACT:
A photo-coupler apparatus has a light emitting element in the primary side. The secondary side of this apparatus is comprised of a photoelectromotive diode array, a light sensitive impedance element series-connected to said array, a drive transistor, and at least one output MOSFET connected to the output terminals of this apparatus. The light sensitive impedance element comes into a large impedance state when an optical signal from the light emitting element is weak. In this case, the light sensitive impedance element generates a sufficient voltage to activate the drive transistor, in spite of the photocurrent being small. This results in an improvement of the dynamic sensitivity of this apparatus. When said optical signal is strong, the impedance element comes into a small impedance state, thus providing the MOSFET with a sufficient photo-current. This results in the shortening of switching times of the output MOSFET.

REFERENCES:
patent: 4390790 (1983-06-01), Rodriguez
patent: 4492883 (1985-01-01), Janutka
patent: 4755697 (1988-07-01), Kinzer
patent: 4801822 (1989-01-01), Idaka et al.
patent: 4804866 (1989-02-01), Akiyama
patent: 5013926 (1991-05-01), Aizawa
patent: 5138177 (1992-08-01), Morgan et al.

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