Solid-state switching circuit employing photon coupling suitable for construction in form of integrated circuit
US4212024A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 3, 1978 |
| Grant date | Jul 8, 1980 |
| Priority date | — |
| Expiry date | May 3, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F55/25
Abstract
A solid-state switching circuit employing photon coupling, which is controlled by a control signal, comprises a control portion which includes at least one light-emitting diode and a load current carrying portion which is formed on a di-electric isolated substrate. The load current carrying portion has a light-activated silicon controlled rectifier, the switching operation of which is controlled by photons emitted from the light-emitting diode. A transistor and a resistor are connected between the gate terminal and the cathode terminal of the light-activated silicon controlled rectifier in parallel to each other. Between the base and the emitter electrodes of the transistor, a photodiode is connected, and between the electrode connected to the n-base layer and the gate electrode of the light-activated silicon controlled rectifier, a diode is connected. And the photodiode is also activated by the photons emitted from the light-emitting diode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.