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

FIELD: pulse engineering; three-phase load control.

SUBSTANCE: three-phase switching unit has thyristors inserted in each phase, connected in parallel opposition, and built around optocouplers; rectifier built around diodes; current-limiting resistors; three diodes; two control buttons, and three current-limiting resistors. Input circuits of first thyristor optocouplers of each phase are connected through anode of light-emitting diode to cathode of light-emitting diode of second thyristor optocoupler of same phase and through cathode, to supply mains phase lead. Anodes of second diodes of two phases are connected to current-limiting resistors and those of third phase, to second control button. Three-phase rectifier and first control button are connected to current-limiting resistors. Novelty is that proposed three-phase switching unit dispenses with three resistors, eight diodes, six voltage regulator diodes, and additional thyristor.

EFFECT: simplified circuit arrangement for connecting thyristor optocouplers and control switch.

1 cl, 1 dwg