Patent ID: 11894763
Assignee: LS ELECTRIC CO., LTD.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An inverter protection device, which determines whether or not a pulse-width modulation (PWM) control signal provided to an inverter unit of an inverter is blocked in accordance with a voltage signal received from first and second switches of a safety relay which are parallelly connected, comprising:
a first power switch which is switched to an on-state by means of a first voltage signal applied from the first switch;
a second power switch which is switched to an on-state by means of a second voltage signal applied from the second switch; and
a buffer unit which is on-off controlled in accordance with an output current of the first and second power switches and provides the PWM control signal to the inverter unit,
wherein the buffer unit comprises a first buffer for receiving power in a turned-on state of the first power switch and a second buffer for receiving power in a turned-on state of the second power switch, and
wherein the first buffer and the second buffer are serially connected between a pulse-width modulation control unit for outputting the pulse-width modulation control signal and the inverter.