Patent ID: 9689598
Date: 2017-06-27
CPC Classifications: B60H,F25B,H02M,Y02T

Claim:
1. A power system for powering a refrigeration unit, the power system comprising: a first connection configured to receive power from a first power source, the first power source being a first high-voltage alternating current (AC) power source; a second connection configured to receive power from a second power source, the second power source being a high-voltage direct current (DC) power source; a third connection configured to receive power from a third power source, the third power source being a second high-voltage AC power source; a power converter configured to supply power to the refrigeration unit, wherein the power converter includes an accumulation choke and a PWM rectifier configured to receive the first high-voltage AC power, the second high-voltage AC power, and the high-voltage DC power and convert the received power to a second DC power; and a switch connecting one of the first connection, the second connection and the third connection to the power converter; wherein the power system couples the first power source to the power converter based on a position of the switch when power is received at the first connection, couples the second power source to the power converter based on a position of the switch when power is received at the second connection but not the first connection, and couples the third power source to the power converter based on a position of the switch, and wherein the PWM rectifier includes: a plurality of diodes configured as a bridge rectifier, a plurality of electronic switches, one of the plurality of electronic switches coupled across each of the plurality of diodes, and a pre-charging circuit maintaining power to the power converter when switching between the first power source, the second power source, and the third power source.