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Systems and methods for providing power to a refrigeration unit or an air conditioner used on a hybrid vehicle. The system includes an accumulation choke, a PWM rectifier, and a frequency inverter. The accumulation choke is configured to receive a first AC power, a second AC power, and a DC power. T

Systems and methods for providing power to a refrigeration unit or an air conditioner used on a hybrid vehicle. The system includes an accumulation choke, a PWM rectifier, and a frequency inverter. The accumulation choke is configured to receive a first AC power, a second AC power, and a DC power. The accumulation choke and PWM rectifier convert the received power into an intermediate DC power having a peak voltage. The PWM rectifier provides the intermediate DC power to the frequency inverter. The frequency inverter converts the intermediate DC power to an output AC power. The frequency inverter provides the output AC power to the refrigeration unit.

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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 s

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; anda 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, andwherein 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, anda 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. 2. The system of claim 1, wherein the second DC power is between about 0 and 750 volts. 3. The system of claim 1, wherein the first high-voltage AC power source includes a shore power. 4. The system of claim 1, wherein the high-voltage DC power source includes a plurality of high-voltage batteries used to power a hybrid vehicle. 5. The system of claim 1, wherein the second high-voltage AC power source includes a belt-driven alternator. 6. The system of claim 1, wherein the first high-voltage AC power source includes a shore power, the high-voltage DC power source includes a plurality of high-voltage batteries used to power a hybrid vehicle, and the second high-voltage AC power source includes a belt-driven alternator. 7. A system for powering a refrigeration unit coupled with a vehicle having a plurality of high-voltage batteries, the system comprising: a power system coupled to the plurality of high-voltage batteries, the power system configured to receive power from a shore power source, and the power system configured to receive power from an alternator, wherein the power system includes a power converter having an accumulation choke and a PWM rectifier, the power converter configured to receive one of a high-voltage DC power from the plurality of high-voltage batteries, a high-voltage AC power from the shore power source, and a high-voltage AC power from the alternator and to convert the received power into a second high-voltage DC power, the power system also including a switch connecting one of the shore power source, the alternator and the plurality of high-voltage batteries to the power converter based on a position of the switch;a refrigeration control unit coupled to the power system, the refrigeration control unit receiving an indication from the power system of the availability of power from the high-voltage batteries, the shore power source, and the alternator; and wherein the refrigeration control unit links power from the power system to the refrigeration unit when power is available from the power system, 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, anda pre-charging circuit maintaining power to the power converter when switching between the shore power source, the alternator, and the plurality of high-voltage batteries. 8. The system of claim 7, wherein the power system includes a frequency inverter configured to receive the second high-voltage DC power from the PWM rectifier and convert the second high-voltage DC power to an AC voltage and to provide the AC voltage to the refrigeration unit. 9. A method of powering a refrigeration unit, the method comprising: receiving at a first input a high-voltage DC power from a plurality of batteries of a hybrid vehicle;receiving at a second input a high-voltage AC power from an electric mains; receiving at a third input a third high-voltage AC power from an alternator;connecting one of the first input, the second input and the third input to a power converter based on a position of a switch, the connecting act coupling one of the high-voltage DC power, the high-voltage AC power, and the third high-voltage AC power to the power converter thereby resulting in a coupled power;disconnecting the coupled power from the power converter when the position of the switch has changed;converting the high-voltage DC power into a second high-voltage AC power by directing the high-voltage DC power through an accumulator choke and a PWM rectifier when the high-voltage DC power is coupled to the power converter and converting the high-voltage AC power into the second high-voltage AC power by directing the high-voltage AC power through the accumulator choke and the PWM rectifier when the high-voltage AC power is coupled to the power converter;providing the second high-voltage AC power to the refrigeration unit; and directing one of the high-voltage DC power and the high-voltage AC power through a pre-charging circuit at an output of the PWM rectifier, the pre-charging circuit maintaining power to the power converter when switching between the first input, the second input, and the third input. 10. The system of claim 7, wherein the pre-charging circuit buffers a current surge when an input power is switched from a first power source to a second power source. 11. The system of claim 1, wherein the PWM rectifier is configured to receive the second high-voltage AC power directly such that the second high-voltage AC power bypasses the accumulation choke. 12. The system of claim 7, wherein the power system is coupled to an alternator, and the PWM rectifier is configured to: receive one of the high-voltage DC power from the plurality of high-voltage batteries, the high-voltage AC power from the shore power source, and a third high-voltage AC power from the alternator, andto convert the received power into the second high-voltage DC power. 13. The system of claim 12, wherein the PWM rectifier is configured to receive the third high-voltage AC power directly such that the third high-voltage AC power bypasses the accumulation choke. 14. The method of claim 9, further comprising: receiving at a third input a third high-voltage AC power from an alternator;connecting one of the first input, the second input and the third input to a power converter based on the position of the switch, the connecting act coupling one of the high-voltage DC power, the high-voltage AC power, and the third high-voltage AC power to the power converter thereby resulting in a coupled power;converting the third high-voltage AC power into the second high-voltage AC power by directing the third high-voltage AC power through the PWM rectifier when the third high-voltage AC power is coupled to the power converter. 15. The system of claim 1, wherein the switch is an automatic switch, wherein a controller automatically selects a position of the automatic switch to connect one of the first connection, the second connection and the third connection to the power converter. 16. The system of claim 7, wherein the switch is an automatic switch, wherein a controller automatically selects a position of the automatic switch to connect one of the shore power source, the alternator and the high-voltage batteries to the power converter. 17. The method of claim 9, wherein the switch is an automatic switch, wherein a controller automatically selects a position of the automatic switch to connect one of the first input, the second input and the third input to the power converter. 18. The system of claim 1, wherein the switch is a manual switch, wherein a user selects a position of the manual switch to connect one of the first connection, the second connection and the third connection to the power converter. 19. The system of claim 7, wherein the switch is a manual switch, wherein a user selects a position of the manual switch to connect one of the shore power source, the alternator and the high-voltage batteries to the power converter. 20. The method of claim 9, wherein the switch is a manual switch, wherein a user selects a position of the manual switch to connect one of the first input, the second input and the third input to the power converter.