Circuit and method for reducing use of battery power during suspend mode operation of a computing device. Output impedance circuitry coupled to voltage regulation circuitry produces a feedback voltage and converts an output signal, produced in response to an input voltage and the feedback voltage, to an output voltage. A portion of the impedance of the output impedance circuitry is altered by control circuitry in response to a control signal, thereby causing changes in the feedback voltage, the output signal and the output voltage.

The present disclosure relates to communicating fault event information between power supply devices. In an example, a fault event communication system can include a comparator that can be coupled to a node that can have a shared bus voltage established by current sharing circuitry. The comparator can compare the shared bus voltage to a reference voltage and output a fault alert signal based on the comparison to alert a respective power supply device that another power supply device is experiencing a fault event. The system can include logic circuitry that can initiate a timer for a time interval in response to receiving the fault alert signal. The logic circuitry can determine a type of fault event at the respective power supply device based on the fault alert signal and duration of time that has elapsed since initiating the timer.

Operating a redundant power supply regulator using a transition control signal including supplying an operating voltage through an ORing in the redundant power supply regulator, wherein the ORing is connected to a comparator configured to turn off the ORing in response to detecting a fault; receiving the transition control signal indicating that the redundant power supply regulator is transitioning to a reduced voltage, wherein the reduced voltage is less than the operating voltage; receiving the reduced voltage by the ORing; and supplying the reduced voltage through the ORing by using the transition control signal to prevent the comparator from turning off the ORing.

This invention has as its objective provision of a method and apparatus to enable the batteries of Electric Vehicles (EV)s to level the electric demand in buildings to reduce demand charges based on instantaneous demand for electric power. This load leveling is done by connecting the EV to the building electrical system by its conventional Alternating Current (AC) recharging connection, and by an additional Direct Current (DC) path supporting intermittent loads. In this way the EV battery stands between the AC energy source and the intermittent load and reduces the electric power drawn from the grid to a constant minimum level, thereby minimizing demand charges.

A standby circuit includes a power regulator configured to operate in an ON state and an OFF state; a power detecting circuit configured to detect power of a load; an integrated circuit module including two interfaces, each of the two interfaces configured to receive an ON operating command or an OFF operating command from a remote control device; and a proximity detection circuit configured to determine a proximity of each of the two interfaces to the remote control device.

A working method of a modular uninterruptible power supply (UPS) includes: obtaining working parameters of the modular UPS, where the working parameters include an input voltage parameter, a load parameter, and a battery parameter; and adjusting a working mode of a power module in the modular UPS according to at least one of the working parameters of the modular UPS, so that not all power modules are in a same working mode, where the modular UPS includes K working modules, and 2≤K.

A utility meter includes: a rectifier configured to rectify AC voltage from a power grid to generate a primary DC voltage supply; and a primary holdup circuitry, including: first capacitors coupled to a primary DC voltage rail and configured to store energy from the primary voltage supply; a switch coupled to the first capacitors; and a control circuit configured to control the primary holdup circuitry, wherein the control circuit is configured to: determine that a secondary DC voltage of a secondary voltage supply is approximately equal to a first specified threshold voltage; and generate a control signal to causes the switch to turn on and cause the one or more first capacitors to release a portion of the energy stored in the one or more first capacitors to the primary DC voltage rail.

A system and a method for distributing electric power from a power source of electricity to power fracturing operations includes a plurality of circuit breakers, each circuit breaker including a first circuit breaker connector and a second circuit breaker connector, each of which outputs electric power to a corresponding transport at a first voltage level, a power source connector that receives electric power from a power source of electricity at the first voltage level, and a black start generator that generates electric power at a second voltage level and that supplies the generated electric power to start the power source of electricity.

A system and a method for distributing electric power from a power source of electricity to power fracturing operations includes a plurality of circuit breakers, each circuit breaker including a first circuit breaker connector and a second circuit breaker connector, each of which outputs electric power to a corresponding transport at a first voltage level, a power source connector that receives electric power from a power source of electricity at the first voltage level, and a black start generator that generates electric power at a second voltage level and that supplies the generated electric power to start the power source of electricity.

Rechargeable battery for a machine tool containing at least one energy storage cell and also one switching apparatus. The rechargeable battery contains a bypass circuit which can be operated in a first and second mode, wherein the bypass circuit is in an inoperative state in the first mode, so that an electric current with a first current value passes from the at least one energy storage cell to the machine tool via the switching apparatus, and wherein the bypass circuit is in an operating state in the second mode, so that an electric current with a second current value passes from the at least one energy storage cell to the machine tool via the bypass apparatus, and wherein the first current value is greater than the second current value. The bypass circuit contains a comparator for comparing a current value which is required by the machine tool with a stored current threshold value, so that, via switching element, the bypass circuit is switched to the first mode when the current value which is required by the machine tool exceeds the threshold value and the bypass circuit is switched to the second mode when the current value which is required by the machine tool falls below the threshold value.