An inductive power outlet is disclosed. The inductive power outlet has a primary inductor, for wirelessly powering an inductive power receiver. The inductive power outlet has a secondary inductor. The primary inductor and the secondary inductor form a resonant frequency. The inductive power outlet comprises a driver generating an oscillating voltage to the primary coil at a frequency higher than the resonant frequency. The inductive power outlet comprises a signal detector. The signal detector comprises a peak detector configured to detect voltage peaks across the primary inductor or current peaks of a current supplied to the primary inductor. The signal detector comprises a processor configured to determine a frequency of either the voltage peaks or the current peaks.

A charge-discharge control circuit includes a first cell balancing circuit having a first switch; a second cell balancing circuit having a second switch; a first cell balance detection circuit having a third switch; a second cell balance detection circuit having a fourth switch; and a control circuit which outputs a control signal to turn on the first switch in a prescribed cycle according to the voltage of a first battery which is higher than or equal to a cell balance detection voltage, or outputs a control signal to turn on the second switch in the prescribed cycle according to the voltage of a second battery which is higher than or equal to the cell balance detection voltage, and outputs a control signal to turn off the third switch and the fourth switch in the prescribed cycle during output of the control signal.

Provided is a technology capable of protecting a charge/discharge control circuit and a battery device from a reverse connection state without a separately provided protection circuit. The charge/discharge control circuit to be contained in a battery device including a secondary cell, an external positive terminal and an external negative terminal, and FETs which control charging and discharging of the secondary cell, respectively, includes: VDD and VSS terminals; a charge control terminal; a discharge control terminal; a voltage detection terminal to which a voltage applied to the external positive terminal is supplied; an NMOS transistor communicates the discharge control terminal and the voltage detection terminal; and a bipolar transistor having a collector to be connected to a drain of the NMOS transistor, an emitter to be connected to a source of the NMOS transistor, and a base to be connected to a bulk of the NMOS transistor and the VSS terminal.

The invention relates to a central unit (100) for supplying emergency lighting means (101a, 101b) on a DC bus (101), comprising an AC input (103) for receiving an AC supply signal, an AC/DC converter (104) configured to convert the AC supply signal into a DC supply signal, an electrical energy storage (105), in particular a battery, configured to be charged by the DC supply signal, wherein the electrical energy storage (105) is configured to supply electrical power in an emergency situation, and a DC/DC converter (107) configured to convert a DC output signal of the electrical energy storage (105) into a DC bus voltage and to forward the DC bus voltage to the lighting means (101a, 101b) on the DC bus (101) via an output circuit (109), wherein the output circuit (109) is arranged on a modular card (111), and wherein the modular card (111) is detachably connectable to a base body (102) of the central unit (100).

In a battery charging system (100), a charger (110) and a smart battery (160) enhance safety in recharging a cell (180) in the smart battery (160) by a power supply (130) of the charger (110). The smart battery (160) is communicable with the charger (110). If a communication failure occurs, the charger (110) disconnects the power supply (130) from the smart battery (160). The smart battery (160) and the charger (110) share the same symmetric encryption key for encrypting and decrypting message data, allowing one party to determine if the other part is an authentic one. When the smart battery (160) finds that the charger (110) is not authentic, or vice versa, the power supply (130) and the cell (180) are disconnected. When the smart battery (160) finds that a no-charging condition occurs due to abnormality in the cell (180), the smart battery (160) requests the charger (110) to stop charging, and also disconnects the cell (180) from the charger (110) even if the charger (110) fails to stop charging the smart battery (160).

According to one aspect of the present disclosure, an energy storage system includes one or more power sources, one or more energy storage components, and one or more solid state circuit breakers disposed between the one or more power sources and the one or more energy storage components such that electrical power is exchanged between the one or more power sources to the one or more energy storage components through the one or more solid state circuit breakers. The energy storage system also includes a controller configured to operate the one or more solid state circuit breakers to control current exchanged with the one or more energy storage components and protect the one or more energy storage components from the one or more power sources during a fault condition.

A charging wake-up circuit includes a first switch, a second switch, a first resistor, a second resistor, and a third resistor. The first switch has a first terminal for receiving a first voltage, and a control terminal for receiving a second voltage. The second switch has a first terminal coupled to the second terminal of the first switch. The first resistor has a first terminal coupled to the control terminal of the second switch, and a second terminal coupled to the first terminal of the second switch. The second resistor has a first terminal coupled to the second end of the second switch, and a second terminal. The third resistor has a first terminal coupled to the second terminal of the second resistor and a device to provide a control voltage to the device to wake up the device, and a second terminal to receive a third voltage.

The control circuit for a system provided with a power converter of multi-phase rotating electric machine, and is provided with a switch driving unit that drives the upper and lower arm switches based on the switching command to drive the rotating electric machine, an emergency power source that generates power with a power supplied from the power storage unit, an abnormality determination unit that determines whether a failure occurs in the control circuit, and an emergency control unit that performs, when the emergency determination unit determines that a failure occurs in the control circuit, a short circuit control in which either the upper arm switches or the lower arm switches are turned ON and the other arm switches are turned OFF by using the emergency power generated by the emergency power source.

Systems for a current limiting circuit are provided. Aspects include a first set of batteries coupled to a battery terminal, a power converter coupled to a power converter terminal, wherein the battery terminal is coupled to the power converter terminal, a first current limiting circuit in series with the first set of batteries, wherein the current limiting circuit comprises a first circuit comprising a first transistor in series with a first diode, a second circuit comprising a second transistor in series with a second diode, a first RL circuit, wherein the first RL circuit, the first circuit, and the second circuit are arranged in parallel, a controller configured to operate the first current limiter in a plurality of modes including a battery discharge mode including the controller operating the first transistor in an off state, and operating the second transistor in a switching state.

Methods and systems for determining an alternator condition in a motor vehicle are provided. The method includes receiving a maximum cranking voltage and a maximum cranking voltage time stamp from the motor vehicle over an asset interface of the telematics device; receiving a maximum device voltage and a maximum device voltage time stamp from the motor vehicle over the asset interface, and determining a potential alternator undercharging condition if a duration between the maximum cranking voltage time stamp and the maximum device voltage time stamp is greater than an undercharging indicator duration threshold. Advantageously, an alternator may be repaired or replaced before it fails thus averting having the motor vehicles inoperable.