Abstract:
A method and apparatus for forming a magnetic component on a printed circuit board. The printed circuit board has at least one inner layer including a trace that forms a winding of the magnetic component. Another winding of the magnetic component is formed by a length of wire that is disposed externally to the printed circuit board.
Abstract:
The object of the standby electric supply is to secure the electrical power supply for a certain load. It comprises an accumulator (300, 300', 300'') which consists of blocks (301, 302, 303, 304), of switching means (402) for conditional connecting of the accumulator to a load or to a charging current supply and of measurement and control means (403) for producing measurement results for showing the status of the accumulator and for controlling the switching means (402) on the basis of the measurement results produced. The measurement and control means (403) have been arranged to measure the initial value of the open cell voltage of each block (uBi,ocv(t1)) from the charged accumulator and to produce a certain threshold value (u¿Bi,ocv,min?) from the measured block specific initial value of the open cell voltage. In addition, it has been arranged to compare the measured open cell voltage (uBi) of each block with the threshold value. As a response to the observation according to which the measured block specific value of the open cell voltage has reached the threshold value, the switching means (402) are controlled to connect the accumulator (300, 300', 300'') to a certain charging current supply.
Abstract:
An AC/DC voltage converter comprises a rectifier circuit (1) and a step-up converter circuit (3), which incorporates a storage capacitor (C1) and a current limiting device. The current limiting device (RNTC) is inserted in series between the lower voltage end of the storage capacitor (C1) and the lower voltage output terminal (4.2) of the step-up converter circuit (3). This minimizes the losses in the current limiting device (RNTC) during normal operation mode.
Abstract:
A transformer providing low output voltage. A transformer core has two outer leg portions and a center portion. A primary winding has a first portion looped around one of the legs so that a current passed through the first winding will produce a magnetic flux in that leg that circulates in either the right hand or left hand sense. A second portion of the input signal winding is looped around the other leg in the opposite sense. This provides for a magnetic flux circulating through the two outer leg portions in the same sense, and provides that the magnetic flux circulating through the center portion is zero. The secondary winding is preferably provided as a fractional loop around one of the outer legs.
Abstract:
The invention relates to a device for precharging the output capacitors in a three-phase three-level pulse rectifier system. According to the invention, a thyristor (18) is arranged in each phase between the input terminal (8) in the direction of flow, whereby said thyristor is connected to the anode of the free-wheeling diode (15) and a precharging branch (2) is connected parallel thereto. The circuit (3) which is used to control the thyristor (18) is activated when pre-charging is terminated; the reference voltage (30) is applied to the negative input (35) of the comparator (28). When an increase occurs in the potential profile which is present at the pick-off of the voltage divider (36) at the input (8) of the branch of the bridge, the voltage at the positive input (37) of the comparator is greater than the reference voltage (37) shortly before the line voltage (12) crosses zero and enters into positive values, whereby said increase triggers a changeover in the comparator output (29) or control of the thyristor (18), whereby control of the thyristor (18) is terminated once more when the average input potential of the branch of the bridge crosses 0.The thyristor (18) is thus ignited solely inside the half-wave of the line voltage during which it is required to for guidance.
Abstract:
Damit die Installation aufwendiger Überwachungsnetzwerke zur Überwachung der Funktionsfähigkeit von an ein Wechselstromnetz (5) angekoppelten Wechselrichtern, insbesondere von dezentral angeordneten, jeweils einen Wechselrichter (1) aufweisenden photovoltaischen Modulen zur Einspeisung von Wechselstrom in ein Wechselstromnetz (5), vermieden werden kann, weist jeder Wechselrichter eine Signalstromsteuereinheit auf und ist mit einer zentralen Empfangseinheit gekoppelt, wobei das Verfahren zur Überwachung der Funktionsfähigkeit der Wechselrichter folgende Schritte umfasst:
a) in jedem Wechselrichter (1) wird in Abhängigkeit von der Signalstromsteuereinheit innerhalb eines bestimmten Zeitraums mindestes einmal ein den Wechselrichter (1) identifizierender Signalstrom dem in das Wechselstromnetz (5) einzuspeisenden Wechselstrom überlagert; b) die Empfangseinheit filtert die Signalströme aus dem in das Wechselstromnetz (5) einzuspeisenden Wechselstrom heraus und überprüft, ob von jedem der an die Empfangseinheit gekoppelten Wechselrichter (1) innerhalb des bestimmten Zeitraums ein Signalstrom empfangen worden ist, c) die Empfangseinheit zeigt einen vermutlichen Fehler eines der Wechselrichter (1) an, wenn nach Ablauf des bestimmten Zeitraums kein Signal von diesem Wechselrichter (1) empfangen worden ist.
Abstract:
Damit die Installation aufwendiger Überwachungsnetzwerke zur Überwachung der Funktionsfähigkeit von an ein Wechselstromnetz (5) angekoppelten Wechselrichtern, insbesondere von dezentral angeordneten, jeweils einen Wechselrichter (1) aufweisenden photovoltaischen Modulen zur Einspeisung von Wechselstrom in ein Wechselstromnetz (5), vermieden werden kann, weist jeder Wechselrichter eine Signalstromsteuereinheit auf und ist mit einer zentralen Empfangseinheit gekoppelt, wobei das Verfahren zur Überwachung der Funktionsfähigkeit der Wechselrichter folgende Schritte umfasst: a) in jedem Wechselrichter (1) wird in Abhängigkeit von der Signalstromsteuereinheit innerhalb eines bestimmten Zeitraums mindestes einmal ein den Wechselrichter (1) identifizierender Signalstrom dem in das Wechselstromnetz (5) einzuspeisenden Wechselstrom überlagert; b) die Empfangseinheit filtert die Signalströme aus dem in das Wechselstromnetz (5) einzuspeisenden Wechselstrom heraus und überprüft, ob von jedem der an die Empfangseinheit gekoppelten Wechselrichter (1) innerhalb des bestimmten Zeitraums ein Signalstrom empfangen worden ist, c) die Empfangseinheit zeigt einen vermutlichen Fehler eines der Wechselrichter (1) an, wenn nach Ablauf des bestimmten Zeitraums kein Signal von diesem Wechselrichter (1) empfangen worden ist.
Abstract:
A method and apparatus for transmitting a signal through a power magnetic structure. A power magnetic core has one or more windings for transmitting power, and two windings for transmitting a signal or auxiliary power. The signal or auxiliary power windings are looped around features of the core so as to cancel the effect of magnetic flux circulating in the core as a result of currents flowing through the one or more power windings.
Abstract:
A modular power supply. A plurality of power supply modules and a system control circuit for controlling the power supply modules are provided. Each power supply module has a power circuit coupled to a power input of the module for receiving an input power current and produces an output power current at a power output of the module. The power circuits each include at least one switching element for switching the input power current or the output power current of a module. The power circuits further include a control circuit input that is coupled directly to the respective said switching device. The system control circuit includes a control circuit output bus for connecting to the control circuit inputs of each of the power modules and provides a respective signal to each module for directly controlling the respective switching devices.