DEVICE FOR SUPPRESSING RADIO NOISE IN ELECTRONIC POWER REGULATOR Russian patent published in 2004 - IPC

FIELD: radio noise suppression in electronic power regulator. SUBSTANCE: power regulator has switching circuit 1 and control circuit 2. Switching circuit 1 has parallel-connected transistor switching circuit 5 and thyristor switching circuit 6 and is connected in series with load 3. Control circuit 2 functions to regulate ac current supplied to load 3 by driving in conduction transistor switching circuit 5 and immediately after that, thyristor switching circuit 6 within supply voltage halfcycle whereupon both transistor and thyristor switching circuits 5 and 6, respectively, should be better changed over to cut-off state at next zero crossing point during this half-cycle. Low-value inductor 9 in the form of spiral is newly introduced and connected in series with thyristor switching circuit 6, both being connected in parallel with transistor switching circuit 5. EFFECT: enhanced reliability at low level of radio noise. 1 cl, 12 dwg