Abstract: A hot-pluggable uninterruptible power supply module includes at least one first power supply device, each first power supply device having an end electrically connected with an electronic system and another end electrically connected with an external AC power source; at least one hot-swapping uninterruptible power supply module, each hot-swapping uninterruptible power supply module including a control module, a second power supply device, and a battery that is electrically connected with the second power supply device. The second power supply device is electrically connected with the control module. The control module of each hot-swapping uninterruptible power supply module is electrically connected with each first power supply device. The second power supply device of each hot-swapping uninterruptible power supply module is electrically connected with the electronic system and an end of each first power supply device.

Abstract: An active isolation switch according to this invention includes a field effect transistor (FET), a first bi-polar transistor and a second bi-polar transistor, and an emitter bias resistor. The FET is formed with a source, a gate, and a drain. The first bi-polar transistor is formed with a first emitter, a first base, and a first collector; the first emitter is connected to the source and the first collector is connected to the gate. The second bi-polar transistor is formed with a second emitter, a second base, and a second collector, the second base is connected to the first base, and the second collector is connected to the drain. The emitter bias resistor is formed with a first terminal and a second terminal; the first terminal is connected to the emitter of the second bi-polar transistor and the second terminal is connected to the emitter of the first bi-polar transistor.

Abstract: A system comprises a plurality of the hot swapping type uninterruptible power supply module and a plurality of conventional power supply. A HSUPS comprises a battery module and a controller module. A conventional power supplies is connected with an external AC power source and converts into DC voltage to provide power to the electronic system and/or to charge the HSUPS when necessary. The battery module holds the energy needed to power the electronic system during the absences of a conventional power supply and/or external AC power source. The controller module controls the operation to charge the battery, discharge the battery, switch off the HSUPS, or be standby. The controller module has the ability to detect for any failure event. The HSUPS provides power to the electronic system when the external AC power source is interrupted and when all of the conventional power supplies are removed from the system.

Abstract: The commutator for a bridgeless PFC circuit is characterized in that a synchronous half-wave rectifier is connected between a bridgeless PFC boost circuit and an AC power source and is coupled to the two terminals of the AC power source. The synchronous half-wave rectifier contains a first synchronous transistor, a second synchronous transistor, and a control circuit.

Abstract: The power supply comprises a bridge rectifier connected to an AC source; a boost converter series-connected to the bridge rectifier comprising an inductance coil; a filter capacitor series-connected to the boost converter; a DC/DC converter connected to a load; a hold-up-time enhancer connected to and positioned between the filter capacitor and the DC/DC converter; and a virtual by-pass system parallel-connected to the hold-up-time enhancer comprising an induction coil inductively coupled to the inductance coil of the boost converter. As such, voltage is induced on the induction coil by the inductance coil in the boost converter and the virtual by-pass system parallel-connected to the hold-up-time enhancer is thereby turned on and off.