Abstract:
An isolation transformer boost system. The system including a power supply and an isolation transformer. The isolation transformer including a primary winding electrically connected to the power supply, a secondary winding, a first voltage tap, and a second voltage tap. The isolation transformer is configured to, in response to a command from an electronic processor, disconnect a connection from the first voltage tap and establish a second connection from the second voltage tap.
Abstract:
A wireless power transmission circuit for wirelessly transmitting line frequency sinusoidal AC power to a load where the line frequency ripple filter of conventional circuits is eliminated and a DC-to-AC inverter is replaced by a simple polarity inversion circuit. The envelope of the high frequency AC on the AC line frequency source side is not constant but varies continuously in a half-sinusoidal fashion at the line frequency. Wireless transmission occurs only with a half-sinusoidal, constantly varying envelope, not the constant amplitude envelope of prior art. High frequency rectification and high frequency ripple filtering occurs as in the prior art but the ripple filter time constant is selected so that resulting waveform is an accurate replica of the rectified line frequency voltage present on the transmitter side. A polarity inversion stage replaces the DC-to-AC inverter of conventional art to generate the line frequency AC.
Abstract:
Methods and systems for managing link voltages in a power converter, where single phase, three phase or universal systems can be used. Common mode management refers to shifting of voltages in a particular direction to perform transition between input and output ports, in addition to maintaining soft switching property. Voltages in power converters can be freely increasing and decreasing, and thus damage to the circuit can be caused if these voltages change are not controlled.
Abstract:
The invention relates to a voltage setting device, comprising at least one multi-step voltage output (34), at least one power converter unit (30), which has at least one first power element (46) that forms at least a part of a power converter branch (32), and a control unit (44), which controls the first power element (46) according to a first voltage step structure (S1) such as to provide a branch voltage (Uz). In order to provide a voltage setting device of the type in question in which non-uniform output voltage steps can be generated in a particularly simple manner in terms of design, according to the invention the power converter unit (30) comprises at least one second power element (48) that, together with the first power element (46), forms the power converter branch (32) and comprises a group of modules (36.x), each comprising at least one energy store (38), a switch group (VB) and a module output (40), and in at least one control mode the control unit (44) is intended to control at least the group of modules (36.x) such as to provide the branch voltage (Uz) in cooperation with the first power element (46) according to a second voltage step structure (S2) which is more detailed than the first voltage step structure (S1).
Abstract:
Die Erfindung betrifft eine Spannungseinstellvorrichtung mit wenigstens einem mehrstufigen Spannungsausgang (34), zumindest einer Stromrichtereinheit (30), die wenigstens einen ersten Leistungsteil (46) aufweist, welcher zumindest einen Teil eines Stromrichterzweigs (32) bildet, und einer Steuereinheit (44), die den ersten Leistungsteil (46) zur Bereitstellung einer Zweigspannung (U z ) gemäß einer ersten Spannungsstufenstruktur (S 1 ) steuert. Um eine gattungsgemäße Spannungseinstellvorrichtung bereitzustellen, bei welcher uneinheitliche Ausgangsspannungsstufen in einer besonders konstruktiv einfachen Bauweise erzeugt werden können, wird vorgeschlagen, dass die Stromrichtereinheit (30) zumindest einen zweiten Leistungsteil (48) umfasst, der mit dem ersten Leistungsteil (46) den Stromrichterzweig (32) bildet und eine Gruppe von Modulen (36.x) aufweist, die jeweils zumindest einen Energiespeicher (38), eine Schaltergruppe (VB) und einen Modulausgang (40) aufweisen, und die Steuereinheit (44) in zumindest einem Steuermodus dazu vorgesehen ist, zumindest die Gruppe von Modulen (36.x) zur Bereitstellung der Zweigspannung (U z ) im Zusammenwirken mit dem ersten Leistungsteil (46) gemäß einer zweiten, gegenüber der ersten Spannungsstufenstruktur (S 1 ) ineren Spannungsstufenstruktur (S2) zu steuern.
Abstract:
A substation (100) is disclosed for use in a power transmission and distribution network. The substation comprises a single phase isolating high frequency transformer (101) having at least one input winding (112, 113) and at least one output winding (114-117) with corresponding input (104) and output (105) solid state switching networks. Each input solid state switching network (104) comprises a plurality of semiconductor switching devices which receive an input waveform from the transmission network and output a high frequency waveform to the primary winding of the transformer. Likewise, each output solid state switching network (105a-105d) comprises a plurality of semiconductor switching devices receiving a high frequency waveform from the secondary winding (114-117) of the transformer and outputting an output frequency waveform from the substation. A control means (110) is adapted to control the operation of the switching devices of the input and output switching networks (104, 105) to generate the output waveform from the input waveform.
Abstract:
The electronic converters that supply the required power to the vibrators which are used in construction industries, the transformers of these converters which are functioning purely as voltage transformers and designed not according to PWM modulation frequency but carrier frequency that causes a significant decrease in size and weight of converters.
Abstract:
An extremely-sparse parallel AC-link universal power conversion device is provided that is capable of converting between various power schemas using a reduced number of switches. The number of heat-dissipating elements and the overall size of the power converter are reduced, while the power density is increased. The expected failure rate is lowered, increasing the reliability of the power conversion device and reducing maintenance frequency and operating cost.
Abstract:
Methods and systems for managing link voltages in a power converter, where single phase, three phase or universal systems can be used. Common mode management refers to shifting of voltages in a particular direction to perform transition between input and output ports, in addition to maintaining soft switching property. Voltages in power converters can be freely increasing and decreasing, and thus damage to the circuit can be caused if these voltages change are not controlled.
Abstract:
Methods and systems for power conversion. An energy storage capacitor is contained within an H-bridge subcircuit which allows the capacitor to be connected to the link inductor of a Universal Power Converter with reversible polarity. This provides a "pseudo-phase" drive capability which expands the capabilities of the converter to compensate for zero-crossings in a single-phase power supply.