Abstract: The present invention relates to an inverter topology with a DC/DC voltage boost converter, which is also scalable. The arrangement of converters and power lines used in this topology makes it possible to maximize the efficiency of the energy conversion that takes place in photovoltaic plants or in any other system based on power transmission that use DC power lines, reducing the values of current used for a given power level. The inverter includes two DC/DC converters connected in parallel to one another and two DC/AC converters connected in parallel to one another. The two DC/DC converters are connected in series with the two DC/AC converters by means of two buses consisting of three DC power lines where one of the DC power lines is common to the two buses.

Abstract: The present invention refers to a method of intrinsically biasing a dual DC/DC converter by means of an active pre-charging of the internal side of the converter prior to its connection with the batteries and a soft biasing of the batteries after the connection of the converter with the batteries. This has the advantage of having a dual DC/DC converter capable of charging isolated batteries in photovoltaic installations in a pole to ground configuration, eliminating the biasing transient that occurs when connecting the battery by means of passive resistive soft charging to the internal capacitor bus of the DC/DC converter, and also eliminating the biasing transient that occurs when starting the DC/DC converter for its normal operation.

Abstract: The present invention relates to a modular solar photovoltaic inverter where by reducing the size of the filtering module and reducing the number of components, it reduces the size of the solar inverter compared to the state of the art; and with the configuration of the power modules, it generates channels that allow the passage of air from the cooling module, obtaining a modular photovoltaic solar inverter that improves the dimensions, weight, maintenance, cooling and safety with respect to those known up until now.

Abstract: The present disclosure provides a photovoltaic solar inverter with an AC grid filter without inductance connectable to the AC grid. The inverter comprises: a power module for converting a DC input voltage into a three-phase AC output voltage; a three-phase AC/AC transformer for adapting the three-phase AC output voltage of the power module to the three-phase AC voltage of the AC grid, which has an inductance “L2”. The three-phase AC/AC transformer comprises a winding on the grid side with an equivalent inductance “L1”; a capacitor “C”, connected to the winding of the grid side of the three-phase AC/AC transformer. The equivalent inductance “L1” of the AC/AC transformer, the capacitor “C” and the inductance “L2” of the AC grid form a high frequency “LCL” filter, eliminating the inductances provided only for forming the LCL filter. The disclosure also provides an AC grid filter without inductance with an “LLCL” typology.

Abstract: The present invention discloses a converter with cold start-up and a cold start-up method for modular power converters that allows converter operation tests to be carried out without a connection to the AC grid. For that purpose, the control module powers the power converter modules, disconnects the power converter from the AC grid, selects a power converter module as the AC-source module and configures a voltage and a frequency for the AC-source module, selects the power for the other power converter modules and sets starting conditions. Previously, the control module is powered by an AC source that can be internal or external, such as an uninterruptible power supply (UPS) or a DC source (photovoltaic field), via a DC-AC transformer.

Abstract: The invention discloses a system and a method for dynamic over-current protection for power converters. The system can be connected to the output of a power stage and comprises: a comparator that measures an output current (IOUT) of the power stage; a control device that measures a voltage (VDC) of the power stage; a test generator that comprises pairs of voltage-current values (VDC-IREF) that relate voltage values with current values of the power stage, where the test generator receives the measured voltage value from the control device and sends the corresponding current value from the pairs of voltage-current values to the comparator, which halts the power stage if the output current of the power stage is higher than or equal to the value of the current associated with the measured voltage.

Abstract: The present disclosure relates to an L-shaped DC/DC converter circuit with multiple configurations for obtaining a boost converter or a buck converter, allowing the voltage and capacity of capacitors, the values of average voltage supported by diodes and transistors, and the levels and ripple of the current circulating through same, to be reduced. The converter, in its most basic configuration, comprises a coil; a first capacitor in series with a third capacitor, wherein the first capacitor is connected to a first voltage, and wherein the first capacitor in series with the third capacitor are connected to a second voltage; a first transistor connected in series to a third transistor, both being connected to the second voltage. The interconnection between the first transistor and the third transistor is connected to the interconnection between the first capacitor and the third capacitor, with the coil interposed.

Abstract: The present invention relates to a modular solar photovoltaic inverter where by reducing the size of the filtering module and reducing the number of components, it reduces the size of the solar inverter compared to the state of the art; and with the configuration of the power modules, it generates channels that allow the passage of air from the cooling module, obtaining a modular photovoltaic solar inverter that improves the dimensions, weight, maintenance, cooling and safety with respect to those known up until now.

Abstract: An integrated power supply system for auxiliary services for power converters comprises a sinusoidal filter connected between an auxiliary output of a DC-AC inverter module and an input of the auxiliary service transformer in such a way that a control module, by means of control commands, interrupts the main output of the DC-AC inverter module and enables the secondary output thereof to allow the auxiliary service transformer to generate the auxiliary AC power. The DC-AC inverter module is connectable to a DC source and supplies the power it generates to an AC network.

Abstract: The present invention discloses a converter with cold start-up and a cold start-up method for modular power converters that allows converter operation tests to be carried out without a connection to the AC grid. For that purpose, the control module powers the power converter modules, disconnects the power converter from the AC grid, selects a power converter module as the AC-source module and configures a voltage and a frequency for the AC-source module, selects the power for the other power converter modules and sets starting conditions. Previously, the control module is powered by an AC source that can be internal or external, such as an uninterruptible power supply (UPS) or a DC source (photovoltaic field), via a DC-AC transformer.

Abstract: The invention discloses a system and a method for dynamic over-current protection for power converters. The system can be connected to the output of a power stage and comprises: a comparator that measures an output current (IOUT) of the power stage; a control device that measures a voltage (VDC) of the power stage; a test generator that comprises pairs of voltage-current values (VDC-IREF) that relate voltage values with current values of the power stage, where the test generator receives the measured voltage value from the control device and sends the corresponding current value from the pairs of voltage-current values to the comparator, which halts the power stage if the output current of the power stage is higher than or equal to the value of the current associated with the measured voltage.

Abstract: An integrated power supply system for auxiliary services for power converters comprises a sinusoidal filter connected between an auxiliary output of a DC-AC inverter module and an input of the auxiliary service transformer in such a way that a control module, by means of control commands, interrupts the main output of the DC-AC inverter module and enables the secondary output thereof to allow the auxiliary service transformer to generate the auxiliary AC power. The DC-AC inverter module is connectable to a DC source and supplies the power it generates to an AC network.

Abstract: The invention relates to a power converter for outdoor use comprising at least a first cabinet having an air inlet (1) and a second cabinet having an air outlet (2) that surround a cell cabinet (3) having a plurality of power cells (3a) and a transformer cabinet (4) with at least one power transformer (4a); and wherein the air inlet (1) comprises a sand trap (5); a cold air stream (9) from outside the converter passes from the air inlet (1) to the cells (3a) and the transformer (4a) through a cyclonic air filter (6) comprising a tubular duct with an inner geometry formed by helical-shaped blades; and wherein a warm air stream (10) from the cells (3a) and the transformer (4a) is expelled through the air outlet (2).

Abstract: A safety shield system having a needle assembly with a safety shield movable from a first position enclosing an end of a needle cannula, to a second position exposing the end of the needle cannula for injection, to a third position lockingly enclosing the end of a needle cannula. The safety shield system permits retraction of the safety shield during use, but extends the shield enclosing the needle cannula in a locked position following use. The safety shield system also has a cap for receiving the needle assembly and lockingly enclosing another end of the needle cannula. Thus, both ends of a double-ended needle cannula are lockingly enclosed following use of the needle assembly of the inventive safety shield system.