Abstract: There is described an electrical energy conversion system comprising: at least a first inverter (1) and at least a second inverter (2), whose outputs are connected in parallel; at least a first DC voltage source (PV1) connected to the input of the first inverter (1) and a second DC voltage source (PV2) connected to the input of the second inverter (2); a ground connection of the first inverter (1) and a ground connection of the second inverter (2). The ground connection of said inverters comprises a ground connection branch (1G; 2G) with a current sensor (5/1; 5/2) which supplies a signal proportional to a leakage grounding current (Ileak) measured in said ground connection branch (1G; 2G). Through the signal proportional to the leakage current measured a feedback signal is generated to control the leakage current (Ileak).

Abstract: A method is described for the transmission of data among devices (D1, D2, . . . Di, . . . Dn) connected to a communication channel (1) through sequences containing at least two symbols, one dominant (“0”) and one recessive (“1”). According to this transmission method, one (DTSG) of the devices connected to the communication channel (1) has the function of time slot generator and it transmits on the communication channel (1) with a transmission frequency (f) a sequence of symbols, each defining a time slot in a sequence of time slots. The sequence of symbols comprises at least a series of recessive symbols (“1”). When one of the devices (Di) has to transmit on the communication channel (1), it generates a sequence of symbols, synchronized with the sequence of time slots generated by the time slot generator device (DTSG) and comprising at least one dominant symbol (“0”).

Abstract: There is described an electrical energy conversion system comprising: at least a first inverter (1) and at least a second inverter (2), whose outputs are connected in parallel; at least a first DC voltage source (PV1) connected to the input of the first inverter (1) and a second DC voltage source (PV2) connected to the input of the second inverter (2); a ground connection of the first inverter (1) and a ground connection of the second inverter (2). The ground connection of said inverters comprises a ground connection branch (1G; 2G) with a current sensor (5/1; 5/2) which supplies a signal proportional to a leakage grounding current (Ileak) measured in said ground connection branch (1G; 2G). Through the signal proportional to the leakage current measured a feedback signal is generated to control the leakage current (Ileak).

Abstract: The multi-level DC/AC converter, comprising: an input (5,7) connectable to a direct voltage source (3), with a first connection (5) and a second connection (7) between which can be applied an input voltage (Vi); a half-bridge with a first controlled switch (21) and a second controlled switch (25) between which is positioned an output (U) of the converter; a first connecting branch (15) between the first controlled switch (21) and the first connection (5) and a second connecting branch (17) between the second controlled switch (25) and the second connection (7); a third controlled switch (59) associated to the first controlled switch (21), connectable in series to the first controlled switch to generate an output voltage exceeding a first limit value (Vi/2); a fourth controlled switch (61) associated to the second controlled switch (25), connectable in series to said second controlled switch to generate an output voltage below a second limit value (?Vi/2).

Abstract: A method for clock recovery and data recovery from a data stream on a communication channel includes sampling a data stream on the communication channel at a sampling frequency determined by a clock signal and generating a sampled signal. The method further includes determining a phase shift between the communication data stream and the sampled signal and modifying the phase of the clock signal on the basis of the phase shift to obtain a desired phase difference between the sampled signal and the data stream.

Abstract: The PWM modulating method comprises the following steps: detecting actual voltage values (Vc1, Vc1, Vc2, Vc3 . . . ) across bulk capacitors (C1, C2, C3) provided across input terminals of said inverter; calculating a duty cycle vector (D) based on electric parameters defining a rotating vector (V0) representing an output electric quantity required from the inverter; and modifying said duty cycle vector (D) as a function of said actual voltage values to re-balance said bulk capacitors.

Abstract: An energy conversion system and method perform active control of leakage current in multi-level grounded inverters. First and second subsystems each include positive and negative DC source terminals, at least first and second capacitors coupled between the positive and negative terminals to define a common bulk node for the respective subsystem, a DC/DC converter for regulating voltages across the capacitors, and an inverter. The inverters are coupled in parallel to an AC load. First and second grounding branches are homogenously coupled to terminals in the first and second subsystems, respectively, and to the same ground terminal. Control circuitry detects a leakage current value through the ground terminal, generates leakage current control signals for the respective DC/DC converters based at least in part on the detected leakage current value and a reference current value, and communicates the control signals to the DC/DC converters.

Abstract: A method for clock recovery and data recovery from a data stream on a communication channel includes sampling a data stream on the communication channel at a sampling frequency determined by a clock signal and generating a sampled signal. The method further includes determining a phase shift between the communication data stream and the sampled signal and modifying the phase of the clock signal on the basis of the phase shift to obtain a desired phase difference between the sampled signal and the data stream.

Abstract: The multi-phase inverter modulating method provides for calculating a duty cycle vector (D) calculated as a function of electric parameters defining a rotating vector (Vo) representative of an output electric quantity required from the inverter, is multiplied for a stored modulation matrix to obtain a plurality of duty cycle signals for a plurality of electronic switches of said inverter.

Abstract: A method is described for the transmission of data among devices (D1, D2, . . . Di, . . . Dn) connected to a communication channel (1) through sequences containing at least two symbols, one dominant (“0”) and one recessive (“1”). According to this transmission method, one (DTSG) of the devices connected to the communication channel (1) has the function of time slot generator and it transmits on the communication channel (1) with a transmission frequency (f) a sequence of symbols, each defining a time slot in a sequence of time slots. The sequence of symbols comprises at least a series of recessive symbols (“1”). When one of the devices (Di) has to transmit on the communication channel (1), it generates a sequence of symbols, synchronised with the sequence of time slots generated by the time slot generator device (DTSG) and comprising at least one dominant symbol (“0”).

Abstract: A microinverter is provided for converting DC energy from a PV panel into a grid-compatible AC signal. A first plurality of switching elements is coupled between a DC energy source and a primary winding of a transformer. A second plurality of switching elements is coupled to a secondary winding of the transformer. Current sensors sense real time converter parameters including a DC input, an AC output, and a primary current. A digital controller determines an operating mode for the converter based on a DC input signal, with the controller further including a switch signal generator circuit configured to adjust switching states. The switch state adjustments are based on the operating mode, real time converter parameters which include the DC input signal, an AC signal for output to a grid, a primary current, and a desired shape for the AC output signal waveform.

Abstract: The multi-level DC/AC converter, comprising: an input (5,7) connectable to a direct voltage source (3), with a first connection (5) and a second connection (7) between which can be applied an input voltage (Vi); a half-bridge with a first controlled switch (21) and a second controlled switch (25) between which is positioned an output (U) of the converter; a first connecting branch (15) between the first controlled switch (21) and the first connection (5) and a second connecting branch (17) between the second controlled switch (25) and the second connection (7); a third controlled switch (59) associated to the first controlled switch (21), connectable in series to the first controlled switch to generate an output voltage exceeding a first limit value (Vi/2); a fourth controlled switch (61) associated to the second controlled switch (25), connectable in series to said second controlled switch to generate an output voltage below a second limit value (?Vi/2).