Frequency converter, commutation short circuit protection

Details Frequency converter, commutation short circuit protection Frequency converter, commutation short circuit protection

H - Electricity

02

M

321/2

H02M 5/45 (2006.01) H02M 7/523 (2006.01) H02M 7/525 (2006.01)

Patent

CA 1061406

ABSTRACT OF THE DISCLOSURE A parallel resonant circuit frequency converter, in which, through the resonant circuit voltage picked up by a voltage sensor and the inverter output current picked up by a current sensor, a firing instant for the inverter thyristors is determined prior to every zero crossing of the resonant circuit voltage by means of an evaluating circuit, taking into consideration the commutation and the protection time. To detect commutation short circuits, the currents of bridge arms with a common d-c terminal are measured by the current sensor and added up to an a-c current. The current sensor and the voltage sensor are followed by a monitoring device which releases a pulse if between one of the firing instants and the correspond- ing zero crossing of the resonant circuit voltage the inverter output current and the resonant circuit voltage remain in phase or are in phase opposition after the zero crossing.

261405

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