| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 323328000 | Using a transformer or inductor as the final control device | 19 |
| 20080258701 | DC-DC converter with improved dynamic response - The invention relates to a control method and a controller for a DC-DC converter, such as a synchronous Buck converter, which exploits the principle of capacitor charge balance to allow the converter to recover from a positive and/or negative load current step in the shortest achievable time, with the lowest possible voltage undershoot/overshoot. The control method may be implemented by either an analog or a digital circuit. The controller may be integrated with existing controller schemes (such as voltage-mode controllers) to provide superior dynamic performance during large-signal transient conditions while providing stable operation during steady state conditions. The invention also relates to a method and a modification of a DC-DC converter topology that comprises connecting a controlled current source between an input terminal and an output terminal of the DC-DC converter; detecting a load current step to a new load current; modifying a duty cycle of the DC-DC converter; and modifying current through a parallel output capacitor of the DC-DC converter by controlling current of the current source. The methods and circuits provided herein are applicable to Buck converters and Buck-derived converters such as forward, push-pull, half-bridge, and full-bridge converters. | 10-23-2008 |
| 20100213921 | Pre-Charging An Inverter Using An Auxiliary Winding - A transformer module includes a main primary winding coupled to a first input power source to receive a medium voltage signal, multiple main secondary windings each to couple to a power cell of a drive system, and an auxiliary primary winding coupled to a second input power source to receive a low voltage signal. The auxiliary primary winding can be spatially separated from the main windings to increase leakage inductance. The auxiliary primary winding can be active during a pre-charge operation to pre-charge the power cells. | 08-26-2010 |
| 323340000 | Having a variable length winding (e.g., tapped) as the final control device | 15 |
| 20110215790 | Use pairs of transformers to increase transmission line voltage - A smart link in a power delivery system includes an insulator, which electrically isolates a power line, and a switchable conductance placed in parallel with the insulator. The switchable conductance includes switchgear for sourcing, sinking, and/or dispatching real and/or reactive power on the power line to dynamically in response to dynamic loading, transient voltages and/or currents, and phase conditions or other conditions on the power line. | 09-08-2011 |
| 20130057248 | ON-LOAD TAP CHANGER - The invention relates to an on-load tap changer for step transformers, which has one main current branch and one auxiliary current branch for each of the two winding taps to be switched. In each main current branch and auxiliary current branch, switching is accomplished by means of a vacuum switching tube. According to the invention, an additional mechanical contact is provided in each of the main current branches and in each of the auxiliary current branches between the respective winding tap to which said branch is electrically connected and the respective vacuum switching tube in said branch. Said mechanical contacts are switched in such a way that the vacuum switching tubes in the main current branch and the auxiliary current branch of the unconnected winding tap can be galvanically isolated from the unconnected winding tap. | 03-07-2013 |
| 20130234696 | Voltage Regulation Using Multiple Voltage Regulator Controllers - Disclosed herein are systems and methods for regulating a voltage profile of an electric power delivery system. According to some embodiments, a system may include a remote voltage regulating device configured to regulate voltage profile by selecting among a plurality of taps on a remote transformer and an associated a remote voltage regulator controller in communication. The remote voltage regulator controller may calculate remote voltage regulation information and may transmit the remote voltage regulation information to a local voltage regulator controller. The local voltage regulator controller may be in communication with a local voltage regulating device configured to regulate the voltage profile of a local portion of the electric power delivery system by selecting among a plurality of taps on a local transformer. The local voltage regulator controller may be configured to receive the remote voltage regulation information and generate a tap change command for the local voltage regulating device. | 09-12-2013 |
| 20160033980 | ON-LOAD TAP-CHANGER FOR DRY TRANSFORMERS AND DRY TRANSFORMER - An on-load tap-changer for dry transformers, having an electric insulating hollow casing extending around a virtual axis, wherein several electric contact sections are foreseen along a path on the inner surface of the hollow casing, which are electrically joined through the wall of the hollow casing and a selector contact in the inner of the cylinder which is moveable along the path and that's outer end is selectively connectable with one of the contact sections by a respective movement. Respective cables are foreseen to electrically connect the contact sections from the radial outer side of the hollow casing, wherein at least some of the cables have a respective surrounding outer insulation at least at their respective connected end. | 02-04-2016 |
| 20160077534 | VOLTAGE CONTROL SYSTEM - According to an embodiment, the invention provides a voltage control system for medium voltage applications. The voltage control system provides a booster-transformer and a feeder-transformer, each of the booster-transformer and the feeder-transformer having a respective primary winding and a secondary winding, wherein the secondary winding of the feeder-transformer is electrically connected with the primary winding of the booster-transformer by an intermediate circuit. The voltage control system also includes a connection device configured to connect the secondary winding of the booster transformer with an electrical energy supply network in order that the secondary winding of the booster transformer is connected in series with a transmission line having a voltage that is to be controlled. | 03-17-2016 |
| 323341000 | With motor driven tap switch | 4 |
| 20140266142 | Switching Module for Voltage Regulator - The present disclosure provides techniques for an improved switching module for voltage regulators or transformers with voltage regulating taps. The switching module disclosed herein includes a first bypass switch and a second bypass switch coupled to the first bypass switch, at least one prime mover coupled to and configured to actuate at least one of the first bypass switch and the second bypass switch, and at least one load breaking switch coupled between the first and second bypass switches. In certain example embodiments, a separate prime move is configured to actuate each of the bypass switches and the load breaking switch. In certain other example embodiments, one or more of the bypass switches and the load breaking switch is actuated by a shared prime mover. | 09-18-2014 |
| 20150293544 | THYRISTOR ASSISTED ON-LOAD TAP CHANGER AND METHOD THEREOF - A terminal I thereof is respectively connected with transition switches, and a terminal II is respectively connected with transition switches; the other terminals of the transition switches are jointly connected and are connected with the terminal through a saturable reactor and a thyristor switch; the other terminals of the transition switches are jointly connected and are connected with the terminal through a linear reactor, a saturable reactor and an overvoltage triggering thyristor circuit; an odd-numbered side main contact is respectively connected with the terminal I and a common terminal, and an even-numbered side main contact is respectively connected with the terminal II and the common terminal; the terminals of non-common terminals of a main path and a transition path are further connected with a bidirectional voltage stabilizing circuit. | 10-15-2015 |
| 20160041568 | VOLTAGE REGULATOR FOR A POWER DISTRIBUTION SYSTEM AND METHOD OF CONTROLLING SAME - A method of controlling a voltage regulator having a nominal input and a nominal output structured to operate in a forward power mode wherein power flows from the input to the output and a reverse power mode wherein power flows from the output to the input. The method includes sensing current flowing through the voltage regulator, determining a direction of power flow through the voltage regulator based on the sensed current, determining a verified direction of power flow through the voltage regulator by altering a voltage between the input and the output and analyzing an effect caused thereby on at least one of a voltage at the input and a voltage at the output, and selecting a voltage regulating scheme for controlling the voltage regulator based on the verified direction of power flow. | 02-11-2016 |
| 20160181024 | ON-LOAD TAP CHANGER, TAP-CHANGING TRANSFORMER FOR VOLTAGE REGULATION AND METHOD FOR IMPLEMENTING TAP CHANGER IN THE TAP-CHANGING TRANSFORMER | 06-23-2016 |
| 323343000 | With a three or more terminal semiconductive device | 6 |
| 20090146637 | LOAD TAP CHANGER - A load tap changer includes a single mechanical switch that is movable to create, in a first position, a first conducting path between a first transformer tap and a load. When the switch is in a second position, the switch creates a second conducting path between a second transformer tap and the load. A first thyristor pair or other device creates a first alternate conducting path between the first transformer tap and the load when the switch is disengaged from the first position. A second thyristor pair or other device creates a second alternate conducting path between the second transformer tap and the load when the mechanical switch is disengaged from the second position. Each thyristor pair may be selectively triggered to provide a conducting path when voltage across either thyristor pair exceeds a predetermined level. A gate trigger circuit may be included for each thyristor pair, and a gate control circuit may control each of the gate trigger circuits. | 06-11-2009 |
| 20120112730 | ARRANGEMENT OF A STEPPING SWITCH ON A CONTROL TRANSFORMER - The invention relates to the arrangement of a stepping switch on a control transformer, wherein either only the mechanical contact system ( | 05-10-2012 |
| 20130249528 | TAP CHANGER - The invention relates to a tap changer for regulating voltage, comprising semiconductor switching elements on a regulating transformer having a regulating winding. The tap changer is modularly constructed, wherein each module comprises a sub-winding of the regulating winding that can be switched on or off by semiconductor switching elements. | 09-26-2013 |
| 20140197816 | TAP CHANGER - The invention relates to a stepping switch for voltage control, comprising semiconductor switch elements on a variable transformer having associated regulating windings. The stepping switch has a modular design, wherein each module comprises a respective sub-winding of the regulating winding which can be activated or deactivated by semiconductor switch elements. | 07-17-2014 |
| 20150301538 | LOAD TAP CHANGER - A method of switching taps of an on-load tap changer includes providing a main finger, a first side finger including a first solid state switch and a second side finger including a second solid state switch. The main finger, the first side finger and the second side finger are utilized to provide a connection between the taps and a power terminal of the on-load tap changer. The method also includes triggering the on-load tap changer to shift the fingers from a first tap to a second tap of the on-load tap changer when a tap change signal is received and utilizing the first solid state switch and the second solid state switch to commutate a current during the tap change operation. | 10-22-2015 |
| 20150338861 | TAP CHANGER - The invention relates to an on-load tap changer ( | 11-26-2015 |
| 323344000 | Having a windng in series with the source and load (e.g., buck-boost) | 2 |
| 20100026274 | BOOST SNUBBER CIRCUIT STRUCTURE - A boost snubber circuit structure applied in a power supply having a boost circuit and a power conversion unit, wherein the boost circuit includes a boost unit connected to a switch element, a boost control unit for generating a driving signal to drive the switch element to control the charge/discharge of the boost unit, and a boost snubber unit for obtaining a voltage difference between a reference voltage and a detection signal and modulating the magnitude of the reference voltage or the detection signal to change the voltage difference and control the duration of outputting the driving signal. The voltage difference between the reference voltage and the detection signal determines the duration of outputting the driving signal. By controlling the voltage difference between the detection signal and the boost level, the invention prevents an occurrence of an inrush current caused by a too-large duration of generating the driving signal. | 02-04-2010 |
| 20190149047 | MULTIPHASE BUCK CONVERTER WITH CURRENT BALANCING | 05-16-2019 |
