THREE-PHASE SWITCHING UNIT Russian patent published in 2004 - IPC

FIELD: pulse engineering; three-phase load control.

SUBSTANCE: proposed three-phase switching unit that incorporates provision for using low-voltage control switch has thyristor optocouplers in each phase of supply mains connected in parallel opposition and in series with load, three current-limiting resistors, six diodes, and control switch. Each current-limiting resistor is inserted in respective phase of supply mains between anodes of second thyristor optocoupler of each phase and diodes of same phase of supply mains. Leads of two diodes in two phases of supply mains are interconnected and connected to output lead of third phase of supply mains. Leads of two diodes of third phase are connected to output leads of two other phases of supply mains.

EFFECT: simplified circuit arrangement for connecting input circuit of thyristor optocouplers.

1 cl, 1 dwg