Abstract: A power conversion circuit includes a first terminal, a second terminal, a first switching conversion unit, a second switching conversion unit, a flying capacitor and a magnetic element. The first switching conversion unit includes a first switch and a third switch. The second switching conversion unit includes a second switch and a fourth switch. The magnetic element includes two first windings and a second winding. A first one of the two first windings is serially connected between the flying capacitor and the second terminal. A second one of the two first windings is serially connected between the second switch and the second terminal. The second winding is serially connected with the flying capacitor and the first one of the two first windings. A turn ratio between the second winding, the first one of the two first windings and the second one of the two first windings is N:1:1.

Abstract: The present document relates to power converters. A power converter may be configured to convert an input voltage at an input of the power converter into an output voltage at an output of the power converter. The power converter may comprise a first switching circuit with a first inductor, a first high-side switching element, and a first low-side switching element. The power converter may comprise a second switching circuit with a second inductor, a second high-side switching element, and a second low-side switching element. The power converter may comprise a capacitive element having a first terminal coupled to the first high-side switching element and to the second high-side switching element and having a second terminal coupled to the first low-side switching element at a first node. The power converter may comprise a third switching element coupled between the first node and the output of the power converter.

Abstract: A device for cancellation of parasitic voltage on the neutral line and for adjusting phase-to-neutral voltage at the remote end of a long power line comprises an autotransformer and at least two single-port-to-multi-port controllable selectors and a controller. The controller is adapted to enable educated selection of taps of the autotransformer by the controllable single-port-to-multi-port controllable selectors, for setting the phase-to-neutral output voltage to nominal voltage and for canceling the parasitic neutral-to-ground voltage.

Abstract: A voltage regulation system for an electrical power distribution network that receives electricity from one or more distributed energy resources includes: a voltage regulation device configured to maintain a voltage in the electrical power distribution network to within a voltage bandwidth, the voltage bandwidth including a range of voltages; and a control system coupled to the voltage regulation device, the control system configured to: analyze voltage data, the voltage data including a plurality of voltage samples, each of the voltage samples representing the voltage in the electrical power distribution network at a time within a period of time; determine an adjusted voltage bandwidth for the voltage regulation device based on the analysis; and change the voltage bandwidth of the voltage regulation device to the adjusted voltage bandwidth.

Abstract: A motor driving circuit includes a rotation speed request generator, a motor driving signal generating unit, an inverter circuit, a position detecting circuit, a current detecting module, a rotation speed signal lookup module, an automatic leading angle controller, and a modulation signal generating circuit. When the rotation speed request signal indicates that a rotation speed of a motor is adjusted to a current rotation speed, the rotation speed signal lookup module queries a lookup table and generates a leading angle indication signal for indicating a current leading angle as a adjusting angle, and the automatic leading angle controller generates a phase adjusting signal, and the modulation signal generation circuit roughly adjusts a modulation waveform with the adjusting phase. The modulation signal generating circuit performs a fine adjustment on the modulation waveforms according to a phase difference, thereby making the current zero-crossing point near the BEMF zero point.

Abstract: Certain aspects and features include a system and method for monitoring the operational status of assets in an electric power distribution system. For example, an asset monitoring system identifies a zone of operation for an asset under evaluation. The asset monitoring application identifies meters connected to transformers in the zone of operation and obtains meter voltages for the meters over multiple intervals. The asset monitoring application determines a primary voltage for at least one transformer based on at least one meter voltage. The asset monitoring application uses the primary voltage in a power flow calculation to estimate an operational setting for the asset. The asset monitoring application compares the voltages from the power flow analysis using the estimated operational setting and the voltages from the meter voltages across multiple time intervals. Based on the comparison, the asset monitoring application determines an operational status of the asset.

Abstract: A system and method for an isolation transformer boost system. The system includes an isolation transformer, a sensor, and an electronic processor coupled to the sensor. The electronic processor configured to receive an electrical characteristic measurement from the sensor, compare the electrical characteristic measurement to a predetermined threshold, and activate an electrical characteristic boost when the electrical characteristic measurement is below the predetermined threshold.

Abstract: A power electronics device includes one or more electrical windings included in an insulating substrate. A cavity and a channel connected to the cavity are also included in the insulating substrate, and a magnetic core is located in the cavity. The device also includes primary and secondary side electrical components located on first and second regions of a principal surface of the insulating substrate. An isolation region is located on the principal surface of the insulating substrate between the first and second regions, and the channel extends from the cavity to a first channel opening at an outside edge of the insulating substrate such that, when viewed along a thickness direction of the insulating substrate, the isolation region completely overlaps the first channel.

Abstract: A method and apparatus for minimizing circulating currents on a power distribution line. In one embodiment, the method comprises dynamically adjusting a turns ratio of a tap changing transformer, the tap changing transformer coupled to a power grid distribution line that is also coupled to a plurality of microgrid branches wherein at least one microgrid branch of the plurality of microgrid branches comprises a distributed energy resource (DER), based on a reactive power measured locally to the tap changing transformer, to minimize current circulating on the power grid distribution line.

Abstract: An on-load tap changer is provided having a plurality of modules, each of which is operable to change taps in a transformer winding. The tap changer includes a motor connected to rotate at least one shaft. The at least one shaft is connected to the tap change modules and is operable upon rotation to cause the tap change modules to each perform a sequence of operations that effectuate a tap change. A multi-turn absolute encoder is connected to the at least one shaft. A monitoring system is connected to the encoder and is operable to determine from the position of the at least one shaft where the tap change modules are in the sequence of operations.

Abstract: A method of controlling a regulating transformer with a settable translation ratio, switchable between a first and second AC-mains includes the following operations: detecting phasor data of phasors of the first and/or second AC-mains; determining an equivalent circuit diagram with equivalent circuit diagram parameters for the first AC-mains; determining a load model with load model parameters for the second AC-mains; determining the equivalent circuit diagram parameters and the load model parameters from the phasor data; and when switching over to a desired translation ratio is to take place: predicting a working point of the second AC-mains for the desired translation ratio; checking a stability criterion in the second AC-mains for the predicted working point; and switching over to the desired translation ratio is carried out upon the stability criterion being fulfilled, but otherwise not switching over to the desired translation ratio.

Abstract: A power generation system includes an electric generator mechanically driven by a variable speed kinetic source, a first power conversion system connected with an output of the electric generator, and a second power conversion system connected with the output of the electric generator, wherein the electric generator and power conversion systems are adapted to convert the output of the electric generator to a predetermined direct current (DC) voltage.

Abstract: A transfer switch transfers electric power provided to an electrical load from a first power source to a second power source. The transfer switch includes a coil arrangement that controls movement of a member to open or close a contactor of the first or second power source. The coil arrangement may be used with two voltage levels.

Abstract: This disclosure relates to power converters capable of providing multiple output voltage levels. With respect to USB-C adapter design, the converter's output may need to be changed between different voltage levels, e.g., a low voltage (such as 5V, 10V), an intermediate voltage (such as 12V, 20V), or a high voltage (such as 20V, 40V)—based on the charging device's request. By using a tapped-winding transformer, the turns-ratio of a flyback transformer may be intelligently selected for high output voltage ranges, thus enabling the duty cycle to be kept the same for the low and intermediate voltage output levels. The flyback converter would then only need to accommodate the intermediate and high output voltages. For high output voltages, a switch may be activated to put the two windings of the transformer in series; for lower output voltages, the switch may be turned off, such that only one winding is used.

Abstract: Embodiments of the disclosure pertain to a voltage regulator system having a voltage regulation controller and a transformer assembly. The transformer assembly includes a coil winding, a multi-contact tap arrangement connected to the coil winding, and a multifurcated tap changer system that includes a first tap changer having a contactor element which makes contact with a first contact of the multi-contact tap arrangement when the controller provides a positioning stimulus based on sensing a voltage deviation from a nominal output voltage of the voltage regulator system. The multifurcated tap changer system further includes a second tap changer that is mechanically ganged to the first tap changer and includes another contactor element arranged to automatically make contact with a second contact of the multi-contact tap arrangement when the contactor element of the first tap changer makes contact with the first contact of the multi-contact tap arrangement.

Abstract: Many electronic devices, such as voltage converters, motors, etc., include electromagnetic components through which the current flow must be estimated. Such electromagnetic components include transformer windings, motor windings, and other types of inductors. In order to estimate the current through such components with reasonable accuracy and without unnecessary power loss, the inherent resistance of the electromagnetic component is used in conjunction with an auxiliary winding through which effectively no current flows. A first terminal of the auxiliary winding directly connects to a first terminal of the electromagnetic component and runs in parallel to the component. The voltage across a second terminal of the auxiliary winding and a second terminal of the electromagnetic component is measured and closely approximates the voltage across the equivalent series resistance (ESR) of the electromagnetic component. This measured voltage is used to estimate the current through the component.

Abstract: Embodiments of the disclosure pertain to a voltage regulator system having a voltage regulation controller and a transformer assembly. The transformer assembly includes a coil winding, a multi-contact tap arrangement connected to the coil winding, and a multifurcated tap changer system that includes a first tap changer having a contactor element which makes contact with a first contact of the multi-contact tap arrangement when the controller provides a positioning stimulus based on sensing a voltage deviation from a nominal output voltage of the voltage regulator system. The multifurcated tap changer system further includes a second tap changer that is mechanically ganged to the first tap changer and includes another contactor element arranged to automatically make contact with a second contact of the multi-contact tap arrangement when the contactor element of the first tap changer makes contact with the first contact of the multi-contact tap arrangement.

Abstract: An electric power system includes an OLTC transformer including a plurality of primary and secondary windings inductively coupled to each other. The electric power system includes at least one on-load tap changer coupled to at least one of the primary and secondary windings that is selectively configurable to regulate the portion of the primary and secondary windings inductively coupled to each other. The electric power system also includes a plurality of buses coupled to the transformer and are positioned downstream therefrom. The electric power system further includes at least one processor coupled to the tap changer configured to regulate a voltage bandwidth of the tap changer as a function of estimated voltage values of at least one bus as estimated based on a priori values of power/current transmitted through each bus. The a priori values are substantially based on measured power/current transmission through the on-load tap changer.

Abstract: A sample cooling device for histological samples is connectable to a power network for supplying electrical voltage to the device. The sample cooling device comprises a measuring apparatus for measuring a magnitude of an input line voltage present at the sample cooling device, and a transformer having a primary coil that comprises at least three coil pickoffs, and a secondary coil. The sample cooling device further comprises a switching means that connects two of the coil pickoffs to the power network as a function of the magnitude of the input line voltage, so that a magnitude of an output voltage present at the secondary coil has a predefined or predefinable voltage value irrespective of the magnitude of the input voltage. A corresponding method for supplying electrical power to a sample cooling device for histological samples is also disclosed.

Abstract: Each phase of a multi-phase voltage converter includes a power stage, passive circuit, synchronous rectification (SR) switch, and control circuit. Each passive circuit couples its power stage to an output node of the voltage converter, and is switchably coupled to ground by the SR switch. The current through the SR switch has a half-cycle sinusoidal shape with a resonant frequency determined by the reactance of the passive circuit. The control circuit generates signals to control switches within the power stage and the SR switches. The control circuit measures current through the SR switch of each phase, and determines which of the phases has SR switch current which returns to zero the quickest. This phase is identified as a master, and the other phases of the voltage converter are aligned to this master phase such that none of the SR switches is turned off when negative current is flowing through it.

Abstract: While the whole weight of magnetic shields provided in a tank of a transformer is reduced, eddy current loss by magnetic flux leaked from a winding is reduced. A transformer is configured using an iron core having an iron core leg and an iron core yoke, windings wound around the iron core leg, a tank having the iron core and the windings therein, and a first magnetic shield and second magnetic shields formed by laminating silicon steel sheets inside the tank. The first magnetic shield is arranged opposite to the windings, the second magnetic shields are arranged between the first magnetic shield and the tank, and the first magnetic shield and the second magnetic shields are fixed to the tank by different support members.

Abstract: The present invention provides systems and methods for integration and for the regulation and parallelism among different models of voltage sources and/or high voltage energized gaps. In a preferred embodiment, the present invention provides an efficient and inexpensive way to integrate equipment such as transformers, in any amounts, with different voltages and different specifications in the same parallelism logic, meeting strict criteria and requirements.

Abstract: A method includes a plurality of voltage regulators distributing power to a plurality of components within a compute node, wherein each of the voltage regulators has a controller, volatile memory and non-volatile memory. The controller of each voltage regulator temporarily caches operating data for the voltage regulator in the volatile memory of the voltage regulator, wherein the controller temporarily caches the operating data collected from the voltage regulator over a sliding time period. When a first voltage regulator from among the plurality of voltage regulators experiences a fault event, the controller of each voltage regulator detects the fault event and automatically copies the cached operating data for the voltage regulator from the volatile memory of the voltage regulator to the non-volatile memory of the voltage regulator in response to detecting the fault event.

Abstract: A transformer includes a first switch, a first winding, a second winding, a third winding, a first current direction control unit, a second current direction control unit and a loading capacitor. The first switch is coupled between the second winding and the third winding. The first winding is disposed at a primary side and coupled between an input voltage terminal and a first ground. The second winding is disposed at a secondary side and coupled between a second ground and the first switch. The third winding is disposed at the secondary side. The first current direction control unit is coupled between the second winding and an output voltage terminal. The second current direction control unit is coupled between the third winding and the output voltage terminal. The first switch is turned on for adjusting a winding ratio when the transformer is used to output a high voltage.

Abstract: The present invention relates to an electric power control system and method therefor, and comprises a control unit 10 and a transformer 20 connected thereto. The control unit 10 detects varying input voltage in real-time, controls switching of triac devices equipped in the transformer, and applies control signal which switches triac device among a plurality of triac devices for target voltage output to the transformer 20. The transformer 20 outputs target voltage by switching tabs of triac devices according to control signal, supplies power by switching tabs of triac devices corresponding to target voltage included in control signal, and preventing EMF induced from primary coil to secondary coil by grounding the tabs of unused triac devices with N-phase for adjustment to the target voltage.

Abstract: A power supply includes a plurality of electronic components including one or more of a rectifier and a switching transistor, an input port configured to receive electrical energy from a power source and a circuit board comprising a cavity. At least one of the rectifier and the switching transistor is embedded in the cavity. The cavity is arranged proximal to the input port such that at least a portion of thermal energy generated by one or more of the rectifier and the switching transistor is dissipated from the power supply by way of the input port.

Abstract: An electric power system including an on-load tap changing (OLTC) transformer is provided. The OLTC transformer includes a primary winding and a secondary winding. A portion of the at least one primary winding and at least one of the secondary windings are inductively coupled to each other. Further, the electric power system includes at least one on-load tap changer coupled to the at least one primary winding or the at least one secondary winding of the OLTC transformer. The on-load tap changer is configured to regulate the portion of the at least one primary winding or the at least one secondary winding that are inductively coupled to each other. Furthermore, the system includes at least one controller coupled to the on-load tap changer. The controller is configured to determine a permissible voltage range defined by a bandwidth around a voltage set-point at the at least one on-load tap changer, where the bandwidth is a function of one or more electrical network states.

Abstract: 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.

Abstract: The present invention discloses a circuitry for adjusting output voltage, which is set between an input voltage source and an internal device, and the circuitry comprises an output voltage converter, a signal controller, and first and second switching transistors. Wherein, the output voltage converter comprises an input coil, a first output coil and a second output coil that are connected in series. The first switching transistor is coupled to the first output coil and the internal device. The second switching transistor is coupled to the second output coil and the internal device. The signal controller is coupled to the internal device, and is further coupled to the first and the second switching transistors. The invention satisfies usage requirement between different internal devices of which the output voltages are greatly different without changing voltage output mode, and the objects to have output voltage with wide range, and lower cost of design.

Abstract: Systems and methods for maximum deviation multi-phase operation provide techniques for controlling voltage regulators and tap changers in a multi-phase system to operate within a maximum deviation window. The maximum deviation window comprises a low boundary value and a high boundary value. In an example embodiment, systems and methods provide techniques for setting the low boundary value and the high boundary value. In another example embodiment, systems and methods provide techniques for optimized power factor correction in a multi-phase system.

Abstract: The invention relates to a control transformer that is designed as a phase-shifting transformer, wherein semiconductor switching components are provided for each phase at a regulating winding with several partial windings. According to the invention, an additional connecting line with an additional electronic switching component is provided in each phase wherein each of these connecting lines connects a module of the respective phase with the end of the main winding of the adjacent phase.

Abstract: A driver amplifier with asymmetrical T-coil matching network is disclosed. In an exemplary embodiment, an apparatus includes a first inductor configured to receive an input signal at an input terminal and to provide an output signal at an output terminal that is matched to a resistive load. The apparatus also includes a second inductor connected to the first inductor and coupled to the first inductor by a coupling coefficient, the second inductor having a first terminal connected to a supply voltage.

Abstract: A multi-phase control system having multi-phase operation with single phase control includes a main control module, a lineman module, and an add-on lineman module. The main control module and the lineman module control, automatically or manually, the first phase and first phase tap changer of a multi-phase system. The add-on lineman module and the main control module control, automatically or manually, additional phases of the multi-phase system. In certain example embodiments, the multi-phase control system detects when a line voltage of an additional phase is de-energized and allows the tap changer of the additional phase to be powered by a line voltage of the first phase. In certain example embodiments, the tap changer of a de-energized phase is powered by an external power supply.

Abstract: The invention relates to a tap changer for the interruption-free switchover between winding taps of a tap-changing transformer. Furthermore, the present invention relates to a novel vacuum interrupter which is particularly suitable for such a tap changer. The tap changer according to the invention is based on the general concept of combining in each case one main contact (V1) and one mechanical switching means (U1), connected in series therewith, of a first load branch and an additional resistive contact (V3) of a second load branch in only a single vacuum interrupter (1) with a common housing (5).

Abstract: Systems and methods are operable to communicate information to a direct current (DC) powered electronic device. An exemplary embodiment receives alternating current (AC) power with an AC information signal modulated thereon, converts the received AC power to DC power, demodulates the received AC information signal to determine information, modulates the information onto the transmitted DC power as a DC information signal, transmits the DC power with the DC information signal over a DC connector to the DC powered electronic device, detects the DC information signal on the modulated DC power at the DC powered electronic device, demodulates the DC information signal from the received DC power, and determines the information at the DC powered electronic device based upon the demodulated DC information.

Abstract: An electric power conversion system has an adaptable transformer turns ratio for improved efficiency. The transformer has multiple taps on its primary. Switching circuitry is configured to connect an energy source to the taps in at least two modes such that the transformer operates with a first primary-to-secondary turns ratio in the first mode and with a second primary-to-secondary turns ratio in the second mode. The first turns ratio is greater than the second turns ratio. Control circuitry is configured to operate the switching circuitry in the first mode when a voltage level of the energy source is above a first threshold and to operate the switching circuitry in the second mode when the voltage level is below a second threshold.

Abstract: The present invention relates to a method for quantitatively analyzing gases as a monitor for on-load tap changers. The general inventive concept lies in selecting particular characteristic gases allowing an indirect subsequent association and a dimension for aging effects, excessive discharge, and/or heating of the on-load tap changer; measuring said characteristic gases, formed during the operation of the tap changer in the insulating oil thereof, at particular time intervals; forming indicative quotients from the measured values of the defined gases, said quotients allowing direct conclusions about aging effects, excessive discharge, and/or heating; displaying trends from a comparison of the currently derived value of each quotient to the most recently derived value for the same quotient; and inferring warnings for aging effects, excessive discharge, and/or heating if the corresponding quotients tend to change significantly over time or in the course of the switch changes made.

Abstract: In a power supply system, reducing influence of a noise etc., optimal electric power is supplied corresponding to power consumption of a receiving side load, and power consumption is decreased greatly. When a potential difference detector 12 detects that a power supply voltage of the receiving side load is decreased lower than a lower limit voltage threshold or increased higher than an upper limit voltage threshold, a burst interval setting unit sets up a burst signal of a pulse width corresponding to the detection result. A burst signal generator generates a burst signal based on the setup, and excites a control primary inductor. A burst signal detector generates a pulse signal in response to electromotive force of a control secondary inductor.

Abstract: The invention relates to an on-load tap changer comprising semiconductor switching elements for uninterrupted switching between winding taps of a tapped transformer. According to the invention, contact bars are provided which extend in the direction of the path of the fixed tap contacts and can be contacted using contact bridges that can be jointly moved by a contact slide in such a way that direct electrical connections to the charge diverter and electrical connections to the inputs and the output of the semiconductor switching elements can be established.

Abstract: Systems and methods are operable to communicate information to a direct current (DC) powered electronic device. An exemplary embodiment receives alternating current (AC) power with an AC information signal modulated thereon, converts the received AC power to DC power, demodulates the received AC information signal to determine information, modulates the information onto the transmitted DC power as a DC information signal, transmits the DC power with the DC information signal over a DC connector to the DC powered electronic device, detects the DC information signal on the modulated DC power at the DC powered electronic device, demodulates the DC information signal from the received DC power, and determines the information at the DC powered electronic device based upon the demodulated DC information.

Abstract: A multi-path constant current drive circuit includes a DC/AC converter, a main transformer and at least two rectifying and filtering units. The main transformer includes at least one assistant side winding with a tap; together with the assistant side winding of the main transformer, each of the at least two rectifying and filtering units respectively forms a power supply loop; each power supply loop includes a first rectifying loop and a second rectifying loop, which are relatively used for the rectification of the positive and the negative half-cycle alternating voltage; a current-equalizing transformer is arranged between the adjacent first power supply loop and second power supply loop, the windings of the current-equalizing transformer are respectively in the rectifying loops contained in the first power supply loop and the second power supply loop, thus realizing the current equalization between the different rectifying loops in which the adjacent rectifying and filtering units are contained.

Abstract: An apparatus and method for measuring the source-side line voltage from a source potential transformer (PT) of a regulator during reverse power flow. A reverse power regulation algorithm is employed during reverse power operation of the tapchanger to energize a contact relay which switches the analog voltage input from the load side to the source side of the regulator. Voltage regulation then operates based on the measured source side voltage instead of the traditional calculation of the source side voltage based upon the load-side voltage and regulator type.

Abstract: Systems and methods for maximum deviation multi-phase operation provide techniques for controlling voltage regulators and tap changers in a multi-phase system to operate within a maximum deviation window. The maximum deviation window comprises a low boundary value and a high boundary value. In an example embodiment, systems and methods provide techniques for setting the low boundary value and the high boundary value.

Abstract: A multi-phase control system having multi-phase operation with single phase control includes a main control module, a lineman module, and an add-on lineman module. The main control module and the lineman module control, automatically or manually, the first phase and first phase tap changer of a multi-phase system. The add-on lineman module and the main control module control, automatically or manually, additional phases of the multi-phase system. In certain example embodiments, the multi-phase control system detects when a line voltage of an additional phase is de-energized and allows the tap changer of the additional phase to be powered by a line voltage of the first phase. In certain example embodiments, the tap changer of a de-energized phase is powered by an external power supply.

Abstract: The present invention relates to a static compensator and a method for controlling thereof, more particularly, to a static compensator including a transformer connected with a bus of a power system; an inverter operating according to a control signal and connected to the transformer in series; a tap changer changing turn ratio of the transformer; and a controller generating the control signal to operate the inverter and generating a tap up or a tap down signal to provide to the tap changer and a method for controlling thereof.

Abstract: A voltage equalization device for equalizing voltage fluctuations in a voltage supply is provided. The voltage supply has an electrical voltage that is as constant as possible. The voltage equalization device has at least one transformer unit which has a primary winding unit and a secondary winding unit and, on one of the two winding units, has at least three or more selection units for switching in or switching out turns of the winding unit. Two adjacent selection units are so arranged in each case as to be separated from one another by a distance having a number of turns. The number of turns between two first adjacent selection units is different from the number of turns between two further adjacent selection units.

Abstract: A power regulator 130 includes a power input line 181, a primary winding connected to the power input line 181 and wound on a core, a secondary winding, at least part of the secondary winding being in common with the primary winding, at least one tap 132, 133, and 134 connected to the primary winding at a predetermined position thereof to specify respective numbers of turns of the primary winding and the secondary winding, at least one switch S1, S2, and S3 having one end connected respectively to the at least one tap 132, 133, and 134 and another end connected to a common line 183 to change the respective numbers of turns of the primary winding and the secondary winding, and an output line 182 for outputting power that the secondary winding generates as the secondary winding is excited by the primary winding, wherein the respective numbers of turns of both the primary winding and the secondary winding are determined as one of the at least one switch S1, S2, and S3 is closed.

Abstract: An input adaptable electrical test set provides for the automatic detection of the power source connected to the test set, as well as automatic configuration of the test set to accommodate the identified power source. Prior to identification of the power source, a circuit breaker isolates a main transformer associated with the test set from receiving power from the power source. The main transformer includes a primary winding and a secondary winding, the primary winding having first, second and third tap positions that allows the transformer to be configured in one of two states depending on the power source connected to the test set. An automatic input voltage detection circuit monitors the input voltage provided by the unidentified power source and identifies the power source based on the monitored voltage.

Abstract: Regulation of a remote load center voltage from a local location of a voltage regulator and a voltage regulator control using voltage measurements from the remote load center obtained using a metering device at the load center in communication with the voltage regulator control. The metering device may obtain remote voltage information at the load center and communicate such to the voltage regulator control using a direct communications line, a wide area network, or the like. The communications may include electrical (e.g. copper cable), light (e.g. infrared over fiber optics), radio frequency, or the like. The voltage regulator control may be configured to use local measurements and a line drop compensation algorithm in the event that the remote voltage information becomes unavailable.

Abstract: The present invention relates to an automatic voltage regulator, and more specifically, to an automatic voltage regulator capable of precisely controlling the output voltage level by using a toroidal autotransformer. The present invention has precise voltage control to enable the output of the voltage level desired by the user, and precisely carries out a variety of applications of power saving and voltage booster. In particular, the present invention can boost/reduce the input voltage to provide a desired target voltage within an error range of 1 volt or less. The present invention also comprises a simple relay switching circuit and excludes semiconductor switching devices, thereby being capable of operating adaptively in different system environments without an additional modification.