Abstract: In one aspect, a modular static transfer switch is provided. The module static transfer switch includes an output configured to couple to a load, a first input configured to couple to a first power source, and a second input configured to couple to a second power source. The modular static transfer switch further includes a plurality of sold-state switch modules each comprising at least one solid-state switch. A first plurality of the solid-state switch modules are coupled in parallel between the first input and the output, each configured to selectively couple the first power source to the output using the at least one solid-state switch. A second plurality of the solid-state switch modules are coupled in parallel between the second input and the output, each configured to selectively couple the second power source to the output using the at least one solid-state switch.

Abstract: A cooling system for power semiconductor switches is provided. The cooling system includes a heat sink that is pressed against the power semiconductor switch. A plenum is also provided with an opening through a wall thereof which is aligned with the heat sink. A fan draws air through or around the heat sink and through the plenum wall opening and the plenum in order to cool the power semiconductor switch.

Abstract: A method of operating a static transfer switch is provided. The method includes monitoring a voltage waveform for each phase of first and second power sources, and calculating flux for each phase of the power sources. The method also includes determining (i) a first flux difference between the respective flux of the first phases of the first and second power sources, (ii) a second flux difference between the respective flux of the second phases of the first and second power sources, and (iii) a third flux difference between the respective flux of the third phases of the first and second power sources. The method further includes turning off a third solid-state switch to disconnect the third phase of the first power source from a load, in response to the controller determining that the third flux difference is greater the first and second flux differences.

Abstract: A method of operating a static transfer switch is provided. The method includes monitoring a voltage waveform for each phase of first and second power sources, and calculating flux for each phase of the power sources. The method also includes determining (i) a first flux difference between the respective flux of the first phases of the first and second power sources, (ii) a second flux difference between the respective flux of the second phases of the first and second power sources, and (iii) a third flux difference between the respective flux of the third phases of the first and second power sources. The method further includes turning off a third solid-state switch to disconnect the third phase of the first power source from a load, in response to the controller determining that the third flux difference is greater the first and second flux differences.

Abstract: In one aspect, a modular static transfer switch is provided. The module static transfer switch includes an output configured to couple to a load, a first input configured to couple to a first power source, and a second input configured to couple to a second power source. The modular static transfer switch further includes a plurality of sold-state switch modules each comprising at least one solid-state switch. A first plurality of the solid-state switch modules are coupled in parallel between the first input and the output, each configured to selectively couple the first power source to the output using the at least one solid-state switch. A second plurality of the solid-state switch modules are coupled in parallel between the second input and the output, each configured to selectively couple the second power source to the output using the at least one solid-state switch.

Abstract: A cooling system for power semiconductor switches is provided. The cooling system includes a heat sink that is pressed against the power semiconductor switch. A plenum is also provided with an opening through a wall thereof which is aligned with the heat sink. A fan draws air through or around the heat sink and through the plenum wall opening and the plenum in order to cool the power semiconductor switch.

Abstract: A static transfer switch is provided for supplying power to a load alternately from two different power sources. Switching between the two power sources may occur within a fraction of one electrical cycle. In response to sensing degraded performance in the power source supplying the load, a main circuit is turned off with a resonant turn off circuit. The resonant turn off circuit is shared between the main circuits of two different power sources such that the resonant turn off circuit is connected to the main circuit of whichever power source is currently supply power to the load.

Abstract: A static transfer switch is provided for supplying power to a load alternately from two different power sources. Switching between the two power sources may occur within a fraction of one electrical cycle. In response to sensing degraded performance in the power source supplying the load, resonant turn off circuits connected directly to the main switches of two phases of the power source are actuated to commutate the respective main switches. The main switch of the third phase is commutated with one or more of the resonant turn off circuits through the delta side of a transformer connected to the three phases of the power source.

Abstract: Technologies for transferring a load by a static transfer switch (STS) to a catcher uninterruptible power supply (UPS) are disclosed. In an illustrative embodiment, each STS in a catcher UPS system monitors an available power of the catcher UPS. The STS determines, in response to a power failure event of an associated UPS, whether a real-time power supplied to a load connected to the STS exceeds the available power of the catcher UPS and whether the STS has priority over each other STS in the system. The STS transfers the load from the associated UPS to the catcher UPS in response to determining that the real-time power supplied to the load does not exceed the available power of the catcher UPS and that the STS has priority over each other STS in the system.

Abstract: Technologies for interactive predictive control of uninterruptible power supply systems are disclosed. In an illustrative embodiment, a method of controlling a double-conversion uninterruptible power supply (UPS) system may include defining, with a digital signal processor (DSP), a curve as a function of a plurality of user-input reference points associated with an inductor coupled to either an input or an output of the double-conversion UPS system, where the curve is indicative of an electromagnetic behavior of the inductor. The method may also include determining, with the DSP, in response to an application of current to the inductor, an inductance value for the inductor based on the defined curve and the applied current. The method may further include setting, with the DSP, as a function of the determined inductance value, a duty cycle to control switching of at least one of an active rectifier and an inverter of the double-conversion UPS system.

Abstract: Technologies for interactive predictive control of uninterruptible power supply systems are disclosed. In an illustrative embodiment, a method of controlling a double-conversion uninterruptible power supply (UPS) system may include defining, with a digital signal processor (DSP), a curve as a function of a plurality of user-input reference points associated with an inductor coupled to either an input or an output of the double-conversion UPS system, where the curve is indicative of an electromagnetic behavior of the inductor. The method may also include determining, with the DSP, in response to an application of current to the inductor, an inductance value for the inductor based on the defined curve and the applied current. The method may further include setting, with the DSP, as a function of the determined inductance value, a duty cycle to control switching of at least one of an active rectifier and an inverter of the double-conversion UPS system.

Abstract: Technologies for transferring a load by a static transfer switch (STS) to a catcher uninterruptible power supply (UPS) are disclosed. In an illustrative embodiment, each STS in a catcher UPS system monitors an available power of the catcher UPS. The STS determines, in response to a power failure event of an associated UPS, whether a real-time power supplied to a load connected to the STS exceeds the available power of the catcher UPS and whether the STS has priority over each other STS in the system. The STS transfers the load from the associated UPS to the catcher UPS in response to determining that the real-time power supplied to the load does not exceed the available power of the catcher UPS and that the STS has priority over each other STS in the system.