Patent ID: 11949324
Assignee: LS ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G | IPC H

Claim 0:
1. An overcurrent protection inverter comprising:
an inverting unit including two switching elements connected in series with each of legs;
each leg-shunt resistor connected in series with a switching element of a lower leg of each leg of the inverting unit;
a current detector configured to detect each output current from each signal output from each leg-shunt resistor;
an instantaneous maximum output current detector configured to add the output currents received from the current detector to each other to output instantaneous maximum output current of output current of the inverting unit;
a controller configured to:
when each of output current detected by the current detector and the instantaneous maximum output current detected by the instantaneous maximum output current detector is equal to or greater than reference current, perform an overcurrent protection operation for protecting the inverting unit from overcurrent; and

wherein the controller is further configured to:
when each of the output current and the instantaneous maximum output current are equal to or greater than an over-current suppression (OCS) level, perform an OCS operation to temporarily block a Pulse Width Modulation (PWM) input of the inverting unit; or
when each of the output current and the instantaneous maximum output current are equal to or greater than an over-current trip (OCT) level, perform an OCT operation to generate an inverter trip,

wherein a magnitude of reference current for the OCS level is lower than a magnitude of reference current for the OCT level.