Bi-directional switches

Paired N-channel MOSFETs

IGBTs
The Bi-directional Switch Commutation Issues
-Fig.3.1 Possible discrete implementations of a bi-directional switch.

Triacs (Thyristors):

Fast switching / low turn-off time / inverter grade / MOS-gated thyristors have turn off times of 5us to 30us, but are expensive or made for high current applications.
Turn-on time is typically 2 us.
Apparently kHz switching is reasonable, not clear how high it can go with common parts.


Motorola – Thyristor device data TRIACs SCRs Surge Suppressors

-describes matrix switching
Thyristors & Triacs – Ten Golden Rules for Success In Your Application
ST APPLICATION NOTE: NEW TRIACS: IS THE SNUBBER CIRCUIT NECESSARY?
Logic level and sensitive gate triacs
Solid State AC Relays Using Triacs
ON Thyristor Theory and Design Considerations Handbook
Phototriac dV/dt Application Note

Parts:
Sensitive Gate Triac: 2N6071A/B ($0.25 / 100)
BT136S-600D, 4A 600V ($0.29 / 100)
Littlefuse Sensitive Triacs
Vishay PHOTOTRIACs

IRFR120N hexfet, 9A 100V ($0.29 / 100)

Driving a MOSFET with an optocoupler

Guide to using optocouplers
-Tie transistor base to ground (1M to 47k ohm resistor) to speed up switching.

High and low side driver, IR2110S, 500V, 2A, $1.00 / 1

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