Abstract: An electrical power supply system connected to an electrical grid, includes at least one source of electrical power, an inverter which receives power from the electrical source and delivers power to a local load, and a connection to the electrical grid. The system also includes a control unit for controlling the inverter, which interrupts the delivery of power by the inverter when at least one electrical parameter of the system exceeds a threshold value. The system also includes anti-islanding logic which detects at least one symptom of an islanding condition of the system and, when the symptom is detected, to cause a variation in the power level delivered by the inverter.

Abstract: The lighting installation comprises an electrical power supply line (3) and at least one lighting device (21A; 21B; 21C) with controllable light emission, connected to said electrical power supply line (3). Each lighting device is associated with a control unit (25A, 25B, 25C) comprising a device (30) for receiving data transmitted along the electrical power supply line (3) and devices (41; 60) for generating a light emission regulation signal. The electrical power supply line is connected to a controller (27) with a means (83) of transmitting data toward the control unit (25A, 25B, 25C). Additionally, the controller is programmed to send at least one data element to the control unit for regulating the emission of the corresponding lighting device.

Abstract: A power supply cut-off circuit for breaking a connection between a power rectifier and a power supply line leading to a load. The cut-off circuit is adapted to be connected between the power rectifier and the power supply line and includes a switching circuit connected to a control circuit. The control circuit is operable to sense a malfunction in the power rectifier and to use the switching circuit to disconnect the power rectifier from the power supply line. In one embodiment, the switching circuit includes a plurality of MOSFETs connected in parallel with one another and the control circuit disconnects the power rectifier from the power supply line by making the MOSFETs non-conducting when the power rectifier malfunctions and the output current of the power rectifier becomes inverted.

Abstract: The DC/DC converter provides an output current which is periodically variable over time and includes a control network which generates a variable reference signal for the input current which is substantially smoothed and obtained from the difference between the output voltage and a reference voltage. The substantially smoothed reference signal causes a variation in the duty cycle of the converter in order to compensate for the variation in the output voltage resulting from a variation in the output current.

Abstract: There is described a process for producing printed circuits comprising a laminar support, an electrically conductive track on the laminar support, and an auxiliary conductive element soldered to the conductive track. There is a provision to apply the auxiliary conductive element by means of an apparatus for applying SMD components.

Abstract: A supply circuit used in electronic ballasts for discharge lamps having an inverter for generating a supply voltage at a specified switching frequency for a load circuit comprising at least one lamp and a resonant circuit in series with the electrodes of the lamp. The supply circuit also includes a control circuit connected to the load circuit and the inverter so as to reduce the supply voltage provided to the load circuit in case of defective operation of the lamp. The control circuit includes a band-pass filter centered on the switching frequency of the inverter, a level discriminator, and a logic circuit. The control circuit receives an input signal that is dependent on the voltage at a point of the load circuit, and it is filtered through a band-pass filter. The output signal from the band-pass filter is provided to the level discriminator, which determines whether the lamp being used is defective by the frequency of the voltage and provides a corresponding high or low signal to the logic circuit.

Abstract: A control circuit provides, for connecting a motor to a d.c. voltage source (1), two half bridge (3, 7, 5, 9) each with a respective switch (3, 5) with controlled opening and closing; the first of the half bridge connects a pole of the excitation winding (13) to the source (1) and the second of the half bridge connects a pole of the armature (15) to the source (1). A control unit (11) controls the opening and closing of the two switches (3, 5) of the half bridge and the toggling of the reversing device as a function of the operating conditions of the motor. The control unit (11) is programmed in such a way that in the braking phase it toggles both of the controlled switches (3, 5) cyclically, simultaneously or independently, from an open condition to a closed condition and vice versa.

Abstract: The circuit for firing and supplying a discharge lamp, includes:a load circuit (10), with at least one discharge lamp (L) and a voltage supply for supplying a discharge lamp,a subportion of the circuit is in parallel with the lamp (L). This subportion includes at least one arrangement of capacitors (17, 21) and an inductive impedance which can be varied in a controllable manner in order to modify the value of the total impedance in parallel with the lamp.

Abstract: A laminar board for printed circuits is described, consisting of a base layer (1) made of a material with a high coefficient of thermal conduction and, on at least one side (1B) of the base layer, a coating (13) of electrically insulating material forming the surface for the application of the conducting tracks (11) of the printed circuit. The base layer (1) has at least one deformed area with a depression (3A) on one side (1A) and a corresponding projection (3B) on the opposite side (1B), the insulating coating (13) being applied to the side (1B) on which the projection (3B) is disposed, forming a surface substantially free of discontinuities, with a lesser thickness at the position of the projection (3B) and a greater thickness in the areas adjacent to the projection; the power components (15) of the circuit are fitted over the projection (3B).

Abstract: The electronic reactor for discharge lamps (L) comprises a bridge rectifier (5) connected to an alternating voltage source (3); a half-bridge with two controlled switching means (11, 13) made alternately conducting to connect the said lamp (L) and the said bridge rectifier (5); a resonant load circuit (17) connected to the said half-bridge (11, 13); and a smoothing capacitor (29) connected in parallel with the half-bridge (11, 13). An auxiliary resonant circuit (33) is provided to reduce the crest factor and correct the power factor between the output (19) of the half-bridge (11, 13) and the positive pole (5A) of the bridge rectifier (5).

Abstract: An inverter for the supply of one or more discharge lamps with heated electrodes includes a load circuit with a series resonant circuit and at least one lamp, two controllable switches and a control circuit for the switches, causing the switches to conduct alternately. A normally isolated dissipative component is connected, when the voltage across the load circuit exceeds a given value, to the load circuit, thus modifying its figure of merit to limit the maximum voltage without varying the resonant frequency of the load circuit.

Abstract: Equipment for the generation of a stabilized high direct voltage is described, and includes: a step-up transformer (2) whose primary is supplied with a direct voltage and which is designed in such a way as to have dispersed inductances and parasitic capacitances which cause a resonance effect on the opening of the primary; a rectifying circuit (3) to rectify the voltage at the terminals of the secondary winding of the step-up transformer (2); a switch (11) which, when in the closed condition, connects the primary winding of the step-up transformer (2) to ground; and circuits (6,7,8,9) for controlling the opening and closing of the switch (11).