An electrical converter includes at least three AC terminals, a first and a second DC terminal and at least three converter modules. Each of the at least three converter modules has a first converter stage including a flying capacitor circuit coupled to a first switch node, a second converter stage including a flying capacitor circuit coupled to a second switch node, a first inductor, and a first capacitor. The first and second switch nodes are connected to opposite terminals of the first inductor. One of the at least three AC terminals and the second DC terminal are connected to opposite terminals of the first capacitor. The second DC terminal forms a star-point of the first capacitors. A flying capacitor voltage of the first converter stage is clamped to a first voltage across the first capacitor when the first voltage drops below the flying capacitor voltage.

A motor drive system of a vehicle includes: an inverter that receives power from a power source via a bus, where the inverter is connected to a motor of the vehicle; a driver that drives the inverter; a filter that filters a current signal received from the bus to generate a filtered signal; and a control module that operates in an impedance determination mode. The impedance determination mode includes: based on the filtered signal, controlling the driver and the inverter to generate a pulsed signal applied to the power source; determining a current level and a voltage of the power source due to generation of the pulsed signal, and determining impedance based on the current level and the voltage. The control modules are configured to: determine a characterization parameter of the power source based on the impedance; and perform a control operation or a countermeasure based on the characterization parameter.

The present invention provides regulation for an output voltage of a DC-DC voltage converter. The controlled variable provided to the regulator of the DC-DC voltage converter is in this case made up of a controlled variable from a voltage regulator and a further controlled variable from an initial controller. The controlled variable from the voltage regulator is in this case obtained directly from the comparison of the output voltage with a setpoint voltage. The controlled variable from the initial controller takes into consideration, inter alia, the input voltage of the DC-DC voltage converter, the value of the input DC voltage being able to be corrected such that the voltage regulator can be operated close to the zero point during steady-state operation. In this manner, faster and more precise regulation of the output voltage is obtained.

An electrical brake energy feedback system, including a rectifier and inverter circuit, an intermediate DC circuit, a first voltage detection circuit configured to detect voltages of positive and negative terminals of the intermediate DC circuit to obtain a first voltage signal, a bidirectional DC/DC conversion circuit and/or a regeneration control circuit, and an electrical energy flow control circuit for controlling operating states of the bidirectional DC/DC conversion circuit and/or the regeneration control circuit according to the first voltage signal. With this system, the electrical brake energy can be recovered to the greatest extent when the vehicle is running in different zones, and the electrical brake energy consumed by the brake resistor is as little as possible. Accordingly, the vehicle and the entire transportation system can be more energy-saving and environmentally friendly.

An electric vehicle includes a controller configured to receive sensor feedback from a high voltage storage device and from a low voltage storage device, compare the sensor feedback to operating limits of the respective high and low voltage storage device, determine, based on the comparison a total charging current to the high voltage storage device and to the low voltage storage device and a power split factor of the total charging current to the high voltage device and to the low voltage device, and regulate the total power to the low voltage storage device and the high voltage storage device based on the determination.

An electric vehicle control method including using a first motor and a second motor as travel drive sources, performing drive control on the first motor by transmitting a first torque command value to a first inverter, and performing drive control on the second motor by transmitting a second torque command value to a second inverter, and performing switching control of switching, based on a required drive force, the drive control on the second motor by the second inverter between an ON state in which the drive control is performed and an OFF state in which the drive control is stopped, wherein a torque fluctuation amount generated in the second motor during the switching control is calculated based on a rotation speed of the second motor, and the first torque command value is corrected based on the torque fluctuation amount.

A cooperative brake apparatus comprises: a regenerative brake device configured to apply a regenerative braking force to a vehicle a hydraulic brake device configured to apply a hydraulic braking force to at least one wheels using a hydraulic pressure formed by a motor including a first coil and a second coil and a control unit including a power supply device, a first driving circuit configured to transmit electrical energy of the power supply device to the first coil, a second driving circuit configured to transmit the electrical energy of the power supply device to the second coil, a first motor controller configured to control a current applied to the first driving circuit, and a second motor controller configured to adjust a current applied to the second driving circuit, wherein each of the first motor controller and the second motor controller controls the current applied to the first driving circuit and the second driving circuit, respectively, based on the regenerative braking force.

A drive system to be applied to a vehicle is provided which includes a chargeable and dischargeable electric storage device, and in which the electric storage device is capable of being charged by power supply from an external power supply outside the vehicle. The drive system includes a rotating electrical machine, an inverter connected to the rotating electrical machine, a converter configured to transform a power supply voltage of the electric storage device and output the transformed power supply voltage to the inverter, and charging wirings which are capable of being electrically connected to the external power supply. The charging wirings are connected to connection points between the inverter and the converter.

A vehicle control apparatus mounted on a vehicle including a DC-DC converter that supplies electric power from a first battery to a second battery and an auxiliary load includes an electronic control unit configured to control an operation of the converter, determine a state of a starter switch of the vehicle, detect a user operation to the vehicle, and acquire charging status information of the second battery. The electronic control unit is configured to, when the electronic control unit detects a first operation by the user and determines that the starter switch is off, drive the converter such that the converter charges the second battery, and, when an electric power amount charged in the second battery reaches a target amount of charge set based on an amount of electric power to be consumed by the auxiliary load while the starter switch is off, stop the converter.

A system for supplying a low DC voltage to a vehicle from high voltage batteries of the vehicle. The system includes a first DC-DC converter and a second DC-DC converter. The first DC-DC converter is configured to convert a high DC voltage provided by a first battery of the vehicle to a low DC voltage. The second DC-DC converter is configured to convert a high DC voltage provided by a second battery of the vehicle to a low DC voltage. The first DC-DC converter is configured to be electrically connected to the first battery. The second DC-DC converter is configured to be electrically connected to the second battery.