POWER CONVERTING DEVICE FOR HYBRID
First Claim
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1. A power converting device for a hybrid, comprising:
- a first accumulating unit disposed between a first inverter connected to an engine auxiliary motor and a second inverter connected to a load motor, and accumulating electric energy generated by the engine auxiliary motor;
a second accumulating unit configured to accumulate the electric energy accumulated by the first accumulating unit, the electric energy generated by the engine auxiliary motor, and electric energy generated through a generating operation of the load motor;
an initial charging unit disposed between the first accumulating unit and the second accumulating unit, and configured to charge the electric energy accumulated in the first accumulating unit to the second accumulating unit;
a switching unit configured to switch a connection between the initial charging unit and the second accumulating unit, and a connection between the second accumulating unit and the load motor, respectively; and
an initial charging control unit configured to make first and second accumulated voltages sensed at the first and second accumulating unit, respectively, the same during initial ignition, and to control the switching unit to connect the load motor and the second accumulating unit.
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Abstract
The present disclosure prevents an inrush current generated when one side is completely discharged, or charged voltages are different from one another because a DC link capacitor and an ultra-capacitor are directly connected to each other, by driving a load motor after completing initial charging by making each voltage the same through the performing of switching between a DC link capacitor and an ultra-capacitor during initial ignition, so as to safely perform initializing regardless of the charged-discharged state of an electricity storage device during initial ignition.
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Citations
12 Claims
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1. A power converting device for a hybrid, comprising:
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a first accumulating unit disposed between a first inverter connected to an engine auxiliary motor and a second inverter connected to a load motor, and accumulating electric energy generated by the engine auxiliary motor; a second accumulating unit configured to accumulate the electric energy accumulated by the first accumulating unit, the electric energy generated by the engine auxiliary motor, and electric energy generated through a generating operation of the load motor; an initial charging unit disposed between the first accumulating unit and the second accumulating unit, and configured to charge the electric energy accumulated in the first accumulating unit to the second accumulating unit; a switching unit configured to switch a connection between the initial charging unit and the second accumulating unit, and a connection between the second accumulating unit and the load motor, respectively; and an initial charging control unit configured to make first and second accumulated voltages sensed at the first and second accumulating unit, respectively, the same during initial ignition, and to control the switching unit to connect the load motor and the second accumulating unit. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating a power converting device for use with a hybrid excavator, the method comprising:
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supplying power to an initial charging control unit; sensing a voltage of a first electric storage unit disposed between an engine auxiliary motor and a load motor and a voltage of a second electric storage unit that is charged with electric power generated by at least one of the engine auxiliary motor and a load motor; making the voltage of the first electric storage and the voltage of the second electric storage unit the same during initial ignition; and charging the second electric storage unit through a switching unit for high current conduction disposed between the first electric storage unit and the second electric storage unit; wherein the second electric storage unit is charged from the first electric storage unit through a switching unit for low current conduction during initial ignition. - View Dependent Claims (8, 9, 10, 11, 12)
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Specification