Auxiliary drive apparatus and method of manufacturing same

摘要

An auxiliary drive circuit includes a first energy storage device coupled to a first DC bus and configured to output electrical power to the first DC bus, a first switch-mode power supply coupled to the first DC bus and to a second DC bus, the first switch-mode power supply configured to convert the electrical power to a first voltage and to output the first voltage to the second DC bus, and a second switch-mode power supply coupled to the second DC bus and coupled to an auxiliary bus, the second switch-mode power supply configured to convert the first voltage to a second voltage and to provide the second voltage to the auxiliary bus, the auxiliary bus configured to provide an auxiliary voltage to an auxiliary drive system, wherein the second voltage is different from the first voltage.

主权项

1. An auxiliary drive circuit comprising:
a first energy storage device electrically coupled to a first DC bus; a first switch-mode power supply coupled between the first DC bus and a second DC bus, the first switch-mode power supply configured to step up a voltage of the first energy storage device to a first voltage and provide the first voltage to the second DC bus, where the first voltage is higher than the voltage of the first energy storage device; a second switch-mode power supply coupled between the second DC bus and an auxiliary bus, the second switch-mode power supply configured to step down the first voltage to a second voltage and provide the second voltage to the auxiliary bus, where the second voltage is lower than the first voltage; a voltage converter coupled between the auxiliary bus and an auxiliary load, the voltage converter configured to receive the stepped down second voltage and adjust the second voltage so as to provide a controlled voltage input to the auxiliary load, and a controller in operable communication with the first and second switch-mode power supplies and with the voltage converter, the controller being configured to:
receive an input comprising a measured value of one or more parameters associated with operation of a vehicle in which the auxiliary drive circuit is incorporated;provide a command to the voltage converter regarding the controlled voltage at which to operate the auxiliary load; andbased on the measured value of the one or more parameters, selectively control the first and second switch-mode power supplies to control the second voltage provided to the voltage converter.