Techniques involve controlling battery access on a utility vehicle. Such techniques involve monitoring status of input signals from a group comprising: a lithium battery system, a keyed switch, and a charging receptacle, comparing the status of the input signals to timeout settings stored in memory of the motion control system, initiating a timer based on comparison of the input signals to the timeout settings, and disconnecting at least one direct current (DC) path between a lithium battery interface and a power distribution interface of the utility vehicle in response to expiration of the timer. Such techniques further involve, after disconnecting, reconnecting the at least one DC current path between the lithium battery interface and the power distribution interface in response to a change in status of at least one of the input signals. Such techniques may be performed by a motion control system of the utility vehicle.

A battery charger is provided that includes a switching power converter that regulates an output voltage on an output voltage rail. A transistor couples between the output voltage rail and a rechargeable battery for a system. An error amplifier controls the conductance of the transistor based upon a difference between a battery current conducted by the transistor to the battery and a battery current threshold. A pulse width modulator controls a duty cycle of the switching power converter responsive to a selected error signal from a group of error signals. Based upon which error signal is selected for the duty cycle control, the battery charger either increases or decreases the battery current threshold to assist in keeping the output voltage above a minimum system voltage for the system.

A power supply including a first conversion circuit, a second conversion circuit, a first output capacitor, a second output capacitor, a first discharge circuit, and a second discharge circuit is provided. The first conversion circuit converts a first alternating current (AC) power to a first direct current (DC) power. The second conversion circuit converts a second AC power to a second DC power. The first output capacitor is configured to store the first DC power. The second output capacitor is configured to store the second DC power. The first discharge circuit provides a first discharge path to discharge the first output capacitor in response to the first DC power being greater than the second DC power. The second discharge circuit provides a second discharge path to discharge the second output capacitor in response to the second DC power being greater than the first DC power.

A charging integrated circuit (IC) includes: a connection circuit configured to selectively connect a first battery and a second battery to each other in series and in parallel; a first charger configured to charge the first battery and the second battery connected to each other in parallel in a first charging mode; and a second charger configured to charge the first battery and the second battery connected to each other in series in a second charging mode. The connection circuit may include: a first regulating circuit connected to the first battery in series and configured to regulate a first balancing current flowing to the first battery; and a second regulating circuit connected to the second battery in series and configured to regulate a second balancing current flowing to the second battery.

The battery charge/discharge testing device includes a sub-charge/discharge unit connected to a main charge/discharge unit through bus lines, wherein when an output voltage of a built-in battery in the sub-charge/discharge unit is in a voltage range capable of supplying power, sub-power supply control is executed to supply discharge power of a built-in battery between the bus lines through a full-bridge circuit in a sub-DC/DC conversion unit by duty-ratio controlling ON/OFF of switching elements of the full-bridge circuit so that the voltage between the bus lines becomes a first predetermined voltage value. When the voltage exceeds the first predetermined voltage value during the sub-power supply control, the control is stopped, and constant current charge control is executed to charge the built-in battery through the full-bridge circuit by using, as a power supply, discharge power of the test battery supplied between the bus lines by duty-ratio controlling ON/OFF of the switching elements.

The present disclosure relates to a power supply device of a system contained inside a vehicle. Specifically, the present disclosure relates to a technique for implementing a switching function in place of a switching circuit which limits the power of a battery. The power supply device, according to the present disclosure, determines the start state of the system using a change in the state of a start signal of the vehicle, and supplies power or stops the supply of power according to the determined start state.

A method of charging a battery, the method comprising the steps of: providing a charging current to the battery; determining a property of the battery substantially continuously during charging; and varying a property of the charging current in dependence on the determined property of the battery.

A multi-power-mode ultra-low-power address detector for Radio Frequency (RF) wakeup receivers is provided herein. The address detector is implemented when combined charging and wake-up of a device is required. The method includes a set of components to process a complex address waveform. This address includes a preamble composed of a pulse with a specific width, followed by a digital Pulse Width Modulation (PWM) modulated bit pattern.

Example implementations include a charging device with a capacitor divider circuit including a plurality of battery state inputs operably coupleable to a plurality of battery devices, and a pulse width modulation (PWM) generator operable to selectively charge the battery devices, a plurality of switching transistors each operatively coupled at a gate terminal thereof to a respective PWM control output of a plurality of PWM control outputs, and a flying capacitor operatively coupled at a first terminal thereof to a first plurality of the switching transistors, operatively coupled at a second terminal thereof to a second plurality of the switching transistors. Example implementations further include a comparator operatively coupled to the capacitor divider circuit and operable to determine whether a difference between voltages associated with the battery devices satisfies a voltage threshold, where the capacitor divider circuit is further operable to, in response to a determination that the difference satisfies the voltage threshold, block charging of one or more of the battery devices.

Constant current charge control for supplying a charging current of a set current value to a battery by duty-ratio control for a full-bridge circuit is executed. When the voltage between terminals of the battery rises to a set voltage value during the constant current charge control, the constant current charge control is stopped and constant voltage charge control for supplying the charging current to the battery to maintain the voltage between the terminals at the set voltage value is executed. When the charging current drops to zero during the constant voltage charge control, the constant voltage charge control is stopped and zero amp control for maintaining the charging current at zero is executed. When the voltage between the terminals rises above the set voltage value during the zero amp control, the zero amp control is stopped and minute discharge control is executed.