The power feedback system for an electric vehicle includes a generator, a charging controller, a battery module, and a current limiting controller. A first wheel of the electric vehicle drives the generator to produce an AC power. The charging controller converts the AC power from the generator into a DC power and delivers the DC power to the battery module. The current limiting controller receives and outputs the DC power in the battery module to a driving motor of the electric vehicle at a preset amperage. The driving motor then drives a second wheel to turn. The first wheel has an axle rotational speed greater than that of the second wheel, and the generator produces a greater current than the preset current of the current limiting controller. As such, the power consumption to the battery module is significantly reduced, greatly enhancing the electric vehicle's travelable distance.

A power supply system includes a first energy storage, a second energy storage, a power transmission circuit, and circuitry. The circuitry acquires a request supply amount, a request output amount, and failure detection information. The circuitry controls the power transmission circuit in accordance with the at least one of the request supply amount and the request output amount such that a ratio of an amount of electric power supplied from or to the first energy storage and an amount of electric power supplied from or to the second energy storage is to be a first ratio in a normal operating. The circuitry controls the power transmission circuit in accordance with the at least one of the request supply amount and the request output amount such that the ratio is to be a second ratio which is different from the first ration in a partial failure state.

Certain aspects of the present disclosure generally relate to reducing the size of parallel charging circuits for charging a battery in a portable device, while still effectively providing input current sensing and reverse current blocking capabilities. One example battery charging circuit generally includes: (1) a first charging circuit comprising a first charging output connectable to a battery and a first converter to provide power to the first charging output; and (2) a second charging circuit comprising a second charging output connectable to the battery, a second converter to provide power to the second charging output, a first transistor coupled between an output of the second converter and the second charging output, and a current-sensing circuit coupled to the output of the second converter to sense a current through the first transistor.

An aircraft starting and generating system includes a starter/generator and an inverter/converter/controller (200) that is connected to the starter/generator and that generates AC power to drive the starter/generator in a start mode for starting a prime mover of the aircraft, and that converts AC power, obtained from the starter/generator after the prime mover have been started, to DC power in a generate mode of the starter/generator. A four leg inverter is coupled with a DC power output (452) of the starter/generator and has an inverter/converter/controller (ICC) (580) with a four leg MOSFET-based bridge configuration that drives the starter/generator in a start mode for starting a prime mover of the aircraft, and converts DC power to AC power in a generate mode of the starter/generator. A four leg bridge gate driver (560) is configured to drive the four leg MOSFET-based bridge (580) during start and generate mode using bi-polar pulse width modulation (PWM).

A method for compensating for alternator to battery voltage drop in charging systems lacking external remote sensing capabilities and utilizing serial communications. A controller utilizes an adaptive variable for determining an alternator output voltage setpoint that compensates for battery cable voltage losses, and adjusting the setpoint to achieve substantially constant battery voltage of the entire range of alternator loads.

In a rotary electric machine, a modulation signal generator generates a modulation signal including information indicative of rotation of a rotor based on change of a voltage at an output end of a stator winding, and outputs the modulation signal. A rectifying unit alternately turns on and off the switch to rectify the voltage at an output end of the stator winding, thus generating a rectified voltage. An excitation current supplying circuit is communicably connected to the modulation signal generator via a communication line, and starts a supply of an excitation current to the excitation winding of the rotor to induce a rotating magnetic field in the stator winding when the modulation signal output from the modulation signal generator is input thereto via the communication line.

A method for managing a motor vehicle including a first battery connected to an alternator and an electrical network, the alternator operable either at a positive low alternator voltage or a high alternator voltage higher than the low alternator voltage, the method including: estimating a potential recharging current strength that the first battery could absorb if it was, at that moment, powered by the high alternator voltage; estimating a first alternator yield corresponding to a current rotation speed of the alternator, and to a strength of consumed current actually fed into the network; estimating a second alternator yield corresponding to the current rotation speed of the alternator and to the sum of strengths of a potential recharging current of the battery and of the consumed current; and imposing a high alternator voltage if the difference between the first yield and the second yield is higher than a first threshold.

The present application relates to a power supply circuit of a vehicle, which power supply circuit comprises a first side (A) comprising a power source (14), a first battery pack (12) and first power consumers (16), a second side (B) connected in series with the first side (A), the second side (B) comprising a second battery pack (18) and second power consumers (20), an overload current breaker (22) provided between the first and the second side, said overload current breaker (22) having a pre-determined threshold breaking current (I.sub.Threshold) value, at which value the circuit is broken; a controller (24) connected to said power source for regulating voltage from said power source (14), the controller (24) being provided with said threshold breaking current (I.sub.Threshold) value, the controller further being operatively connected to devices (26, 28) providing information related to a current (I.sub.ch) through said overload current breaker (22). The controller (24) is arranged to determine a maximum permissible charging current (I.sub.Permissible) value in relation to the threshold breaking current (I.sub.Threshold) value; to set a low voltage (V) from said power source (14) for charging said second battery pack (18) at activation of said power source (14); to monitor, with the information from the devices (26, 28), the charging current (I.sub.ch) through said overload current breaker (22) to the second battery pack (18) and to compare the charging current (I.sub.ch) with the maximum permissible charging current (I.sub.Permissible); to increase the voltage (V) of the power source (14) if the charging current (I.sub.ch) is below the maximum permissible charging current (I.sub.ch<I.sub.Permissible); and to decrease the voltage (V) of the power source (14) if the charging current (I.sub.ch) is the same as or above the maximum permissible current (I.sub.chI.sub.Permissible).

A vehicle mounted electrical circuit, wherein a parallel charging start processing includes a process of discharging a high-voltage capacitor via an inverter circuit and a three-phase motor in a state in which a connection switching circuit is controlled to stop voltage application from a serial circuit of a first battery and a second battery to the high-voltage capacitor, a process of charging the high-voltage capacitor by applying an output voltage of the first battery to the high-voltage capacitor, and a process of charging the first battery and the second battery in parallel by controlling a connection switching circuit such that a first battery is connected between the high-potential wiring and the low-potential wiring, a second battery between the neutral point and the low-potential wiring is connected, and a charging voltage generated by electric power supplied from an external charging facility is applied between the high-potential wiring and the low-potential wiring.

A charging system and a method of operating the same are provided. The charging system includes an electric machine which may be a wound or un-wound rotor type or a doubly fed induction motor (DFIM). A control system is coupled to the electric machine and a battery system. In the case of a wound rotor, the control system is coupled to stator windings and a rotor winding for controlling excitation of the stator windings and the rotor winding. The charging system is AC and DC compatible. In the case of an AC power source, the control system injects excitation into a rotor winding to induce a desired voltage in the stator, if the power supply voltage of the power supply is greater or smaller than the voltage of the battery system. Other modes of operation allowing for safe charging and discharging of a battery system are also described herein.