Patent ID: 9553533
Date: 2017-01-24
CPC Classifications: H02H,H02M,H02P

Claim:
1. A power system, comprising: an inverter module comprising an inverter circuit configured to connect to a direct current (DC) bus, a capacitive circuit configured to couple across the DC bus; DC bus switches configured to open to remove the DC bus from a DC power source and to close to place the DC bus in power communication with the DC power source; and a precharge circuit configured to charge the capacitive circuit, wherein the pre-charge circuit comprises a precharge resistor, a precharge switch configured to connect the resistor in series between the DC power source and the DC bus when closed and to disconnect the precharge resistor from the DC bus when open, and a control circuit coupled to the DC power source by closing the precharge switch and that commands closing of the bus switches when the capacitive circuit is precharged.