| 摘要 |
FIELD: electrical engineering. SUBSTANCE: device has step-down transformer, rectifier bridge, pulse shaper, integrator, triggering switch, and triac; in addition, it is provided with fuse; one pole of trigger switch is connected to one terminal of AC voltage supply, its other pole is connected to one input of transformer and to one pole of triac whose other pole is connected through load to other terminal of voltage supply which is connected to other input of transformer whose secondary winding is connected in series with rectifier bridge; one output of the latter is connected to other input of transformer and to common bus; other output of rectifier bridge is connected to input of pulse shaper whose output is connected to integrator and, through fuse, to gate electrode of triac. Trigger switch may be inserted between triac and load or between one input of step-down transformer and one pole of triac which is connected to one terminal of voltage supply. Double-input AND gate introduced in device provides for ON/OFF control of load by command coming from external source over one line. Time-setting unit introduced in device enables load connection for desired time interval followed by its automatic disconnection or load disconnection with time delay upon arrival of turn-off command. Time-setting unit provides for controlling power supply to load. Device can control ON/OFF operations in several electric circuits each having load, triac, and trigger switch or only load and triac; each circuit is connected to AC voltage supply in parallel; switching operations may be controlled either in all circuit at a time or in each circuit separately. Device is suitable for handling voltage in three-phase (multiphase) circuits. EFFECT: enlarged functional capabilities. |
