Optically coupled device with high current protection

An optically coupled solid-state relay package comprising:

• input and output sides sealed in a package,
• said input side comprising:
• a light-emitting element, and,
• said output side comprising:
• first and second output terminals;
• an element for driving, said element being connected between said first and second output terminals;
• a light-receiving element for receiving light from said light-emitting element to turn on said element for driving;
• a resistance element having a positive or negative temperature-coefficient, and connected in series with said light-receiving element;
• a capacitor connected in series with said light-receiving element and with said resistance element between said first and second output terminals;
• and
• a triggering element connected between said element for driving and a node, the node being a point of connection between said capacitor and said light-receiving element, said triggering element being triggered at a predetermined voltage to ignite said element for driving,
• wherein said capacitor charges, in use, to the predetermined voltage thereby delaying the triggering of said triggering element.

An optically coupled solid-state relay package comprising:

• input and output sides sealed in a package,
• said input side comprising:
• a light-emitting element;
• and
• a plurality of series-connected diodes connected in parallel with said light-emitting element, and
• said output side comprising:
• first and second output terminals;
• an element for driving, said element being connected to said first and second output terminals;
• and
• a light-receiving element which receives light from said light-emitting element and ignite said element for driving, said light-receiving element connected directly to said element for driving.

An optically coupled device comprising:

• input and output sides,
• said input side comprising:
• a light-emitting element, and,
• said output side comprising:
• first and second output terminals;
• a light-receiving element for receiving light from said light-emitting element;
• a thyristor connected in series with said light-receiving element between said first and second output terminals;
• and
• a resistance element connected between said first output terminal and a gate of said thyristor, said resistance element having a negative temperature-coefficient and being for turning on said thyristor.