Patent ID: 9061595
Filing Date: 2015-06-23
Classification: B60L,H02M,Y02T

Abstract:
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: