| 摘要 |
The invention refers to a control circuit of thyristor firing angle to monophase, three-phase or polyphase rectification bridges, as well as for the control of triac firing angle. It uses opto-couplers , as switches instead of transformers for the synchronization of sinusoidal voltage of the network supply line with the thyristor or triac firing angle, simplifying significantly the control circuit and minimizing fabrication cost. Opto-couplers can be opto-transistors, opto-triacs or opto-thyristors. Basic characteristic of the circuit is the isolation that provides to the electronic control circuit between the network voltages and rectification voltage. |
