| 摘要 |
PURPOSE: To transmit control information with high reliability and electrically separate an output part by generating two negative auxiliary voltages through a third repeater provided with two individual secondary windings and cutting off the switching transistor of each half-bridge by the auxiliary voltage. CONSTITUTION: A repeater 03 has two secondary coils 13, 14 to respectively generate two kinds of auxiliary voltages U21, U22, and capacitors C13, C14 are charged through diodes D13, D14 by the secondary windings 13, 14. The auxiliary voltages U21, U22 are lowered by the resistors R3, R4. A voltage is applied to the secondary windings 11, 12 of repeaters ue1, ue2 through resistors R15, R16 from transistors T9, T12 by the auxiliary voltages U21, U22. On the other hand, a negative voltage is applied to output resistors R12, R22. A half-bridge can be brought into a cut-off state through such a negative voltage. |
