FREQUENCY CONVERTER Russian patent published in 2012 - IPC H02H7/12 H02M5/16 H02M5/27 

FIELD: electricity.

SUBSTANCE: invention relates to conversion equipment and is designed for use in electric AC drives controlled by optoelectronic insulators, and sources of secondary power supply. In the frequency converter with an intermediate link of DC and a power unit, representing a bridge circuit on transistor keys, apart from protection of these keys against failure in case of throughput current in a bridge arm and in transition processes of converter disconnection, an additional protection is introduced for control of a bridge inverter in transition processes of converter elements supply. The additional protection consists in the fact that control of the bridge inverter is provided only in the case, if voltage of converter elements supply is more than 4.5 V. Otherwise, control of the bridge inverter will be blocked.

EFFECT: introduction of additional protection of bridge inverter control in transition processes of converter elements supply.

2 dwg