A power supply system (10) is used for supplying power to a power system of an electric tractor and comprises a bracket (100) that is provided above and below a frame of a transport trailer, first cases (200) that are provided on the bracket and first power battery packs that are suspended inside the first case. Each of the first cases is provided with a first ventilation structure and a second ventilation structure (211) so that while the transport trailer is moving, wind can enter the first case from the first ventilation structure and be discharged from the second ventilation structure, thus achieving further cooling and heat dissipation for the first power battery packs and avoiding service life being impacted due to the first power battery pack overheating.

A power supply system (10) is used for supplying power to a power system of an electric tractor and comprises a bracket (100) that is provided above and below a frame of a transport trailer, first cases (200) that are provided on the bracket and first power battery packs that are suspended inside the first case. Each of the first cases is provided with a first ventilation structure and a second ventilation structure (211) so that while the transport trailer is moving, wind can enter the first case from the first ventilation structure and be discharged from the second ventilation structure, thus achieving further cooling and heat dissipation for the first power battery packs and avoiding service life being impacted due to the first power battery pack overheating.

A cooling fan vane assembly for a resistor grid may include a duct having a substantially round inlet opening, a substantially rectangular outlet opening, and a side wall extending between the inlet opening and the outlet opening shaped to transition from a substantially round shape to a substantially rectangular shape; the inlet opening including a plurality of radially extending turning vanes; and a frustoconical vane positioned in the duct adjacent a downstream side of the plurality of radially extending vanes.

A cooling fan vane assembly for a resistor grid may include a duct having a substantially round inlet opening, a substantially rectangular outlet opening, and a side wall extending between the inlet opening and the outlet opening shaped to transition from a substantially round shape to a substantially rectangular shape; the inlet opening including a plurality of radially extending turning vanes; and a frustoconical vane positioned in the duct adjacent a downstream side of the plurality of radially extending vanes.

A vehicle includes an electric machine configured to recharge a battery through regenerative braking, an electric heater configured to heat a powertrain lubricating oil, and a controller. The controller, in response to a temperature of the powertrain lubricating oil being less than a threshold, directs regenerative braking power to the electric heater.

A system for dissipating regenerated electric energy produced by an electric actuator of an aircraft, the dissipating system including: a resistor; two switching arms, each switching arm being connected in series with the resistor, the two switching arms being connected together in parallel, each switching arm including two switches connected to one another in series, each switch including two terminals and a control grid, each switch being capable of being controlled by controlling the potential applied to the control grid thereof; and a measurement system capable of measuring the voltage at the terminals of each switch.

A system for dissipating regenerated electric energy produced by an electric actuator of an aircraft, the dissipating system including: a resistor; two switching arms, each switching arm being connected in series with the resistor, the two switching arms being connected together in parallel, each switching arm including two switches connected to one another in series, each switch including two terminals and a control grid, each switch being capable of being controlled by controlling the potential applied to the control grid thereof; and a measurement system capable of measuring the voltage at the terminals of each switch.

An electric vehicle controller includes an inverter that drives a motor by receiving power supplied from an overhead line, a brake chopper circuit that includes a switching device and a braking resistor and is connected in parallel with the inverter, a voltage detector that detects a bus voltage applied to DC buses, and a control unit that performs power consumption control of causing the braking resistor to consume regenerative power supplied from the motor and overvoltage suppression control of suppressing the bus voltage from being excessive. The control unit controls the switching device such that a second duty ratio used at the time of performing the overvoltage suppression control is lower than a first duty ratio used at the time of performing the power consumption control.

A vehicle, particularly a rail vehicle, includes at least one brake resistor assembly having electrical brake resistors which can receive electrical braking energy and convert the electrical braking energy into waste heat during braking operation of the vehicle. The brake resistors are divided into a first subgroup and a second subgroup, the first sub-group and the second sub-group are electrically connected in parallel, and an evaluating device monitors functional capability of the brake resistors on the basis of a measured variable indicating a differential current between a first subgroup current flowing through the first subgroup and a second subgroup current flowing through the second subgroup. A method for monitoring electrical braking resistors of a vehicle is also provided.

A vehicle, particularly a rail vehicle, includes at least one brake resistor assembly having electrical brake resistors which can receive electrical braking energy and convert the electrical braking energy into waste heat during braking operation of the vehicle. The brake resistors are divided into a first subgroup and a second subgroup, the first sub-group and the second sub-group are electrically connected in parallel, and an evaluating device monitors functional capability of the brake resistors on the basis of a measured variable indicating a differential current between a first subgroup current flowing through the first subgroup and a second subgroup current flowing through the second subgroup. A method for monitoring electrical braking resistors of a vehicle is also provided.