Disclosed herein is an apparatus that includes a first external terminal supplied with a first power potential, a second external terminal supplied with a second power potential different from the first power potential, a first transistor connected between the first external terminal and an internal power line, a second transistor connected between the second external terminal and the internal power line, and a first circuit configured to turn the first transistor OFF during at least a first period until the second power potential is supplied after the first power potential is supplied.

A multi-mode uninterruptible power supply (UPS) is provided. The multi-mode UPS includes a first path including a rectifier and an inverter, and a second path in parallel with the first path, wherein the multi-mode UPS is operable in an economy mode in which power flows from a utility to a load through the second path while at least one of the rectifier and the inverter is activated, the at least one of the rectifier and the inverter operable to perform at least one of DC voltage regulation, reactive power compensation, and active damping.

A multi-mode uninterruptible power supply (UPS) is provided. The multi-mode UPS includes a first path including a rectifier and an inverter, and a second path in parallel with the first path, wherein the multi-mode UPS is operable in an economy mode in which power flows from a utility to a load through the second path while at least one of the rectifier and the inverter is activated, the at least one of the rectifier and the inverter operable to perform at least one of DC voltage regulation, reactive power compensation, and active damping.

A power supply system is installed in a vehicle having one or more sources of electrical energy. The power supply system includes at least two distributing boxes each having at least one internal distribution bus, at least two output switches and a driver processor. The internal distribution bus can be connected to the source or sources of electrical energy. The output switches for each supplies a different electrical consumer of the vehicle from the internal distribution bus. The driver processor controls the output switches so as to distribute a consumption load between the electrical consumers in association with different operating modes of the vehicle.

A power supply system is installed in a vehicle having one or more sources of electrical energy. The power supply system includes at least two distributing boxes each having at least one internal distribution bus, at least two output switches and a driver processor. The internal distribution bus can be connected to the source or sources of electrical energy. The output switches for each supplies a different electrical consumer of the vehicle from the internal distribution bus. The driver processor controls the output switches so as to distribute a consumption load between the electrical consumers in association with different operating modes of the vehicle.

An all-electric, battery powered industrial or commercial mobile power unit is provided that can include a number of features. The mobile power unit can include a DC electrical energy source configured to produce a voltage of approximately 300-450 VDC. The mobile power unit can be configured so as to produce a user programmable voltage output and/or a user selected voltage output of either 480 VAC 3-phase, 208 VAC 3-phase, or 240 VAC single-phase. The various output configurations are controlled by software with a system controller of the mobile power unit. Methods of use are also provided.

A power source including a timer operational between an off position where the power source is off and an on position where the power source is on and delivering power, a transformer electrically communicative with the timer, a contactor electrically communicative with the transformer, operational between an open configuration and a closed configuration, and controllable by the timer, a motor electrically communicative with the contactor, an alternator mechanically communicative with the motor, a fuse assembly configured to fail upon reaching a preset failure mode, a battery assembly configured to be rechargeable by the alternator, a junction block electrically communicative with the fuse assembly and through which the alternator is communicative with the battery assembly, and a converter system configured to convert charge from the battery assembly from DC-to-AC.

An automatic transfer switch (ATS) utilizing molded case circuit breakers (MCCB) or molded case switches (MCS) to connect and disconnect an electrical load to a Normal power source and a Standby power source. The ATS comprising two MCCB or MCS mounted back-to-back one connected to a Normal power source and the other to a Standby power source. Bus bars electrically connect the poles on the load side of the MCCB or MCS connecting the ATS to a load. A rotating cam drive mechanism drives Toggle Levers with attached stored energy opening springs toggles to open and close the MCCB or MCS through the leverage of fulcrum points. A ratchet mounted on the output shaft of a unidirectional gear motor rotates the cam drive mechanism. An interlock bar prevents both MCCB from closing at the same time.

An automatic transfer switch (ATS) utilizing molded case circuit breakers (MCCB) or molded case switches (MCS) to connect and disconnect an electrical load to a Normal power source and a Standby power source. The ATS comprising two MCCB or MCS mounted back-to-back one connected to a Normal power source and the other to a Standby power source. Bus bars electrically connect the poles on the load side of the MCCB or MCS connecting the ATS to a load. A rotating cam drive mechanism drives Toggle Levers with attached stored energy opening springs toggles to open and close the MCCB or MCS through the leverage of fulcrum points. A ratchet mounted on the output shaft of a unidirectional gear motor rotates the cam drive mechanism. An interlock bar prevents both MCCB from closing at the same time.

A power backup circuit provides a plurality of input power sources to back up a load. The power backup circuit includes a first switch, a second switch, and a control unit. The input power sources at least includes a first input power source and a second input power source. If the input power source of the load needs to be changed from the first input power source to the second input power source, the control unit controls the first switch to be coupled to the second input power source and controls the second switch to be coupled to the second input power source after the control unit effects a supply current flowing through a first power supply path and a second power supply path both coupled to the first input power source and the load to be reduced below a current threshold.