A method and system for charge management for a battery in a transport refrigeration unit. The method includes configuring the transport refrigeration unit with a plurality of DC power sources operable from a primary power source, connecting a first DC power source as a battery charger operably connected to the battery and configured to provide charging power to the battery, and connecting a second DC power source as a power source for at least one of a controller for the transport refrigeration system and a controller for the battery charger. The method also includes monitoring a voltage of the battery and interrupting the charging of the battery based on the monitoring of a voltage of the battery.

Systems and methods directed to improved battery management, motor control, energy storage and battery charging. The systems and methods enable vehicle electrification and provides a paradigm changing platform that enables integration of battery management, charging and motor controls with means to manage regenerative braking, traction and handling. In embodiments, systems and methods are directed to a unified modular battery pack system having a cascaded architecture comprising an integrated combination of a networked low voltage converter/controller with peer-to-peer communication capability, embedded ultra-capacitor or other secondary energy storage element, battery management system and serially connected set of individual cells as the fundamental building block.

Systems and methods of generating, storing and/or distributing electric power are disclosed. The system may include two or more direct current battery subsystems, a direct current motor/alternating current generator combination, an electric power distribution network, and battery recharging elements. One battery subsystem may power an alternating current generator while the other battery subsystem charges using a portion of the generated power. Excess power may service other electric loads. The roles of the battery subsystems may be switched periodically between charging and powering, repeatedly.

A power supply system includes a plurality of UPSs configured to provide output power to one or more loads using AC power drawn from a supply bus and energy stored at respective energy modules of the plurality of UPSs. Each UPS of the plurality of UPSs comprises a corresponding frequency sensor configured to generate an indication of a frequency of the AC power at the supply bus. The plurality of UPSs comprises a first UPS configured to draw the AC power from the supply bus when the indication of the frequency output by the corresponding frequency sensor for the first UPS satisfies a first frequency priority threshold and a second UPS configured to draw the AC power from the supply bus when the indication of the frequency output by the corresponding frequency sensor for the second UPS satisfies a second frequency priority threshold.

The control device includes a microcomputer which controls operation of the internal combustion engine, a power regulator which outputs a direct current regulated voltage regulated from electric power of the AC generator, a 5V regulator which receives an output from the power regulator and supplies it to the microcomputer; a first capacitor with a small capacity connected to an output of the power regulator, plural second capacitors connected in parallel with the first capacitor; and plural opening and closing means connected in series to the plural second capacitors, respectively. The opening and closing means are controlled to be opened and closed by the microcomputer so that the second capacitors are charged when the output of the power regulator has reached an ON voltage below the regulated voltage.

A configuration can supply a charging current from a power generator to two power storage devices, and can suppress, if an abnormality occurs on one power storage device side, the abnormality from affecting the other power storage device side. A relay device includes: a first switch configured to interrupt a first conductive path ; a second switch configured to interrupt a second conductive path ; a bypass circuit with a series circuit in which a resistor and a third switch are connected in series to each other, the series circuit having one end electrically connected to a portion between the first switch and the first power storage device, and another end electrically connected to a portion between the second switch and the second power storage device; and a controller configured to turn the first switch, the second switch, and the third switch on/off.

A vehicle operates an internal combustion engine according to an automatic start-stop function to reduce fuel consumption. A first DC bus is adapted to connect to a plurality of DC loads. A primary battery is coupled between the first DC bus and a ground. A first alternator is driven by the internal combustion engine to supply electrical power to the first DC bus. A second DC bus is connected to a positive terminal of an auxiliary battery. A negative terminal of the auxiliary battery is connected to the first DC bus. A second alternator is driven by the internal combustion engine to supply electrical power to the second bus at a voltage corresponding to a sum of voltages of the primary and auxiliary batteries. An inverter receives electrical power from the second DC bus to generate an AC output adapted to connect to accessory AC loads.

The present invention relates a single-phase and three-phase compatible circuit and a charge-discharge apparatus. The circuit comprises: a terminal, a first bridge arm, a first switch, a second bridge arm, a switch set, a third bridge arm, a fourth switch, two bus capacitors connected in series, and a fifth switch. The terminal is configured to receive or provide an AC power. When the terminal receives or provides a single-phase AC power, the first switch and the fifth switch are turned on and the first and third terminals of the switch set are electrically connected. The third inductor, the third bridge arm and the two bus capacitors form a half-bridge active filter circuit. A regulation module is electrically connected to the two bus capacitors and the third bridge arm, and controls the third bridge arm based on the voltages of the two bus capacitors.

A power source control unit is for controlling a switch that makes connection between a first power line and a second power line, a first system load being connected to a first power source through the first power line, a second system load being connected to a second power source through the second power line, wherein the power source control unit includes: an SOC acquisition portion as defined herein; a first SOC determination portion as defined herein; a second SOC determination portion as defined herein; a failure determination portion as defined herein; and a switch control portion as defined herein.

A hybrid powertrain system and method includes a prime mover driving a generator/motor to produce an AC power output. The AC power output is applied to a rectifier which is controlled to transform the applied AC power to DC power to supply a DC Power bus at a selected voltage and current. An energy storage device is also connected to the DC power bus and the current flow between the energy storage device and the DC power bus is monitored and compared to preselected values and the results of that comparison are used to alter the operation of the rectifier to increase or decrease, as needed, the current provided to the DC power bus as electrical loads on the DC power bus change.