Solid state relay having a thyristor discharge circuit

Details Solid state relay having a thyristor discharge circuit Solid state relay having a thyristor discharge circuit

1986-12-03

1988-06-28

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307637, 307571, 307311, 250551, H03K 17687, H03K 343, G02B 2700

Patent

active

047541750

ABSTRACT:
A solid state relay comprises a light-emitting diode (2) for generating radiation in response to forward current supplied thereto and an array (5) of photodiodes optically coupled to the light-emitting diode for generating a voltage in response to radiation from the light-emitting diode. A thyristor (18) is provided having anode and cathode coupled to the gate and substrate electrodes (11a, 11b, 14a, 14b) of a field-effect transistor, respectively. A gate electrode (21) of the thyristor is connected to one end (7) of the photodiode array (5) and the cathode of the thyristor is further connected to the other end (8 ) of the photodiode array. The voltage generated by the photodiode array is applied to the switching transistor (9, 10) through a diode (17) so that the impedance between the source and drain electrodes of the transistor has a low value in the presence of the voltage and a high value in the absence of the voltage. A voltage photogerated by the array in response to radiation from the light-emitting diode forwardly biases the diode (7) and backwardly biases the thyristor, so that it is applied to the transistor without loss of energy. Upon cessation of the radiation, a voltage difference between the photodiode array and the transistor backwardly biases the diode (7) and forwardly biases the thyristor, providing a low impedance path for rapidly discharging energy stored in the transistor to cause it to turn off.

REFERENCES:
patent: 4419586 (1983-12-01), Phipps
patent: 4481434 (1984-11-01), Janutka
patent: 4500801 (1985-02-01), Janutka
patent: 4564770 (1986-01-01), Sherman et al.

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