Electrical transmission or interconnection systems – Personnel safety or limit control features – Interlock
Patent
1979-12-14
1981-09-29
Miller, Jr., Stanley D.
Electrical transmission or interconnection systems
Personnel safety or limit control features
Interlock
307300, 307DIG1, 250551, H03F 1700, H03K 504
Patent
active
042925517
ABSTRACT:
There is disclosed an optoelectronic coupling device for transmitting digital signals from an input to an output, which input and output are electrically isolated from each other. An input stage includes an input for receiving digital input signals from an incoming signal line and an output. The input stage is connected to an optoelectronic coupling circuit comprising luminescent diodes and phototransistors arranged adjacent to respective ones of the luminescent diodes. Either the collectors or the emitters of both phototransistors are commonly connected to a first voltage source. The other leads of the phototransistors form outputs of the optoelectronic coupling circuit. An output stage, connected to these outputs, includes an operational amplifier having an output, a non-inverting input and an inverting input. Each of the non-inverting and inverting inputs are connected to one of the outputs of the optoelectronic coupling circuit. The output stage has also two ohmic resistors, each connecting a second voltage source with a respective one of the non-inverting and inverting inputs of the operational amplifier, and a capacitor connected between the non-inverting and inverting inputs. This capacitor and each of said resistors form RC circuits for removing a remaining charge of respective phototransistors when said phototransistors are cut off from saturation.
REFERENCES:
patent: 3671751 (1972-06-01), Korlge et al.
patent: 3810034 (1974-05-01), Brunsch
patent: 3893037 (1975-07-01), Herbert
patent: 3943367 (1976-03-01), Baker
patent: 3961224 (1976-06-01), Vreeland
Optical Isolators Yield Benefits in Many Linear Circuits by Hodapp, Electronics, 3/76, pp. 105-110.
Davis B. P.
Miller, Jr. Stanley D.
Siemens Aktiengesellschaft
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