| 摘要 |
PURPOSE:To control a device in a system to be controlled by a control system at an insulator side, by obtaining a differential pulse by differentiating a control pulse signal and multiplexing the differential pulse to transmit it via a pulse transformer. CONSTITUTION:A control system block 40P is connected to a system block 40S to be controlled via a pulse transformer 45. In the block 40P, a signal having a pulse duration corresponding to the degree of control is differentiated by differentiating circuits 43A and 43B, respectively. These differential pulses are added and synthesized with each other by an adder 44 with different amplitudes. Thus a multiplexed differential pulse is obtained and transmitted to the block 40S via the transformer 45. On the other hand, the block 40S discriminates the differential pulse signals through a signal separating circuit 46 and in accordance with the amplitude and then reproduces a control signal based on each differential pulse. In such a way, the control system can be insulated from the system to be controlled with a pulse transformer, and the system to be controlled at the earth side can be controlled by the insulated control system. |
