Abstract: A coupled-inductor current-doubler topology for a power converter has first and second rectifiers and first and second coupled inductors. Each coupled inductor has a main inductor inductively coupled with a secondary inductor. The secondary inductor of the first coupled inductor is coupled in series with one of the first and second rectifiers and the secondary inductor of the second coupled inductor coupled in series with the other one of the first and second rectifiers.

Abstract: In a DC/DC converter using an insulating transformer Tr having a center tap on the secondary side, an input choke coil L1 and an output choke coil L3 are integrated with the insulating transformer Tr, a primary coil (number of turns: 2N) and a secondary coil (number of turns: n+n) of the transformer, the input choke coil L1 (number of turns: 2N), and the output choke coil L3 (number of turns: n) are wound around a common core (magnetic core), and the coils are arranged in directions of canceling DC fluxes generated by the coils, so that the DC bias magnetization is considerably reduced.

Abstract: A voltage at a capacitor included in a peak detector is equal to a peak output voltage of a full-wave rectifier. A comparator included in a monitor circuit compares an output voltage of the peak detector with a voltage appearing at the capacitor. The comparator inputs a voltage signal corresponding to a compared result, to a switching controller. The switching controller controls a switching operation of a switching device. A power-factor control circuit controls a charge/discharge operation of the capacitor in accordance with a switching operation of the switching device, in a case where an output voltage of a DC-to-DC converter is equal to or less than reference power Pstd [W]. In the case where the output voltage of the DC-to-DC converter is greater than the reference power, the power-factor control circuit controls the charge/discharge operation by directly supplying the capacitor with a current output from a full-wave rectifier.

Abstract: A power supply arrangement, especially in connection with a conductor (5) of a medium-voltage overhead line, which arrangement comprises a power supply (2) and a first and second element (3, 4) made of an electrically conductive material, which are connected electrically to the power supply for feeding energy to the power supply. The first element (3) of the power supply arrangement is arranged to be close to the conductor (5) and has a capacitance (Ce) to an element in a second potential, the capacitance being arranged to charge itself by effect of an electric field generated by the voltage of the medium-voltage conductor, and said second element (4) is arranged to have a galvanic or capacitive connection with the conductor (5) for feeding energy to the power supply (2) from the potential difference between said first and second elements.

Abstract: A circuit and method provides a regulated dc-dc power conversion. Active switches, saturable core inductors, and a diode are used in a quasi-synchronous circuit. During a part of the cycle (the “blocking interval”) free-wheeling current is routed through free-wheeling diode while a saturable core inductor is in a high-impedance, blocking state. During other parts of the cycle an ac inverter voltage is rectified by active switching devices, preferably field effect transistors (FETs). The circuit provides regulated, low voltage outputs with low conversion losses.

Abstract: A power supply unit for use in a measuring instrument at a plant. An output from a current transformer mounted on a power supply line is controlled so that the range of a primary current producing a stable output is increased. The invention includes a current transformer mounted on a cable for providing power to an electric motor, and a power supply unit. The power supply unit includes a rectifier circuit, a short circuit, a reverse current inhibit element, a condenser, a voltage watching circuit, and a constant voltage element. The voltage watching circuit outputs a command signal when the voltage of the condenser exceeds a first level and connects the short circuit 32.

Abstract: A device for producing electricity, the device comprising a three-phase alternator comprising three windings, a rectifier for converting the AC delivered by the alternator into rectified current, and a voltage-raising chopper using the self-inductance of the alternator to raise the voltage. The device includes a switch unit enabling the three windings to be connected either in a star configuration when the alternator is being rotated to produce electricity, or else to the respective phases of a three-phase network when the alternator is stopped.

Abstract: The present invention relates to a circuit for reducing standby power by converting low power outputted from an AC power supply into DC power. The standby power redundancy circuit of the invention reduces standby power by receiving AC power through a reactance device, receiving remote control data from a remote control, connecting a microcomputer for exclusive use for a standby power supply to a first side of an AC power supply, and then reducing the power consumption of a main microcomputer of a main body of a set to ‘0’ using the micro computer.

Abstract: A drive circuit for driving a rectifier switch, a method of driving the rectifier switch and a power converter employing the drive circuit or the method. In one embodiment, the drive circuit includes (1) a blocking diode couplable to a bias energy source and configured to block reverse current flow thereto, (2) an inductor coupled to the rectifier switch, and (3) a switching circuit, coupled to the blocking diode and the inductor, configured to: (3a) resonantly transfer energy from the bias energy source to a control terminal of the rectifier switch via the inductor to turn the rectifier switch ON, and (3b) resonantly discharge the energy through the control terminal to turn the rectifier switch OFF.

Abstract: A secondary active clamp for a power converter, a method of actively clamping energy of the power converter and a power converter employing the clamp or the method. The power converter has a primary switching circuit coupled to a primary winding of an isolation transformer and a rectifier coupled to a secondary winding of the isolation transformer. In one embodiment, the clamp includes (1) an inductor coupled in series with a freewheeling diode of the rectifier and (2) a series-coupled capacitor and clamping switch coupled in parallel with the inductor. The series-coupled capacitor and clamping switch cooperate with the inductor to mitigate adverse effects of a reverse recovery phenomenon associated with the rectifier and to effect substantially zero voltage switching of a power switch of the primary switching circuit.

Abstract: For use in a power converter having an inverter coupled to an output rectifier, a post-regulator, a method of operating the same and a power converter incorporating the post-regulator or the method. In one embodiment: (1) a switching circuit, having at least one controllable switch and coupled an output of the power converter, that receives an output voltage from the power converter and produces a phase-shifted waveform therefrom and (2) a transformer, having a primary winding coupled to the switching circuit and a secondary winding coupled to the rectifier, that delivers the phase-shifted waveform to the rectifier to regulate the power converter, thereby allowing the inverter to be unregulated.

Abstract: A switching regulator device for charging applications includes a transformer (18) which receives an AC input signal from an AC source (12) which is then rectified with a bridge rectifier (24). A regulation control circuit (26) is provided for regulating the output level of the bridge circuit (24) to a load (20). The regulation circuit (26) includes a switching element (62) which is operable to draw current from the AC source (12) in a periodic manner. The on/off duty cycle of the control to the switching element (62) will allow energy to be stored in a leakage inductance (36) of the transformer (18). The transformer (18) therefore comprises the switching inductance of a switching power supply with the leakage inductance (36) designed to provide adequate regulation for the voltage and current supplied to the load (10).

Abstract: A switched-mode power supply for supplying a DC-fed load (LD) by a steppep, stabilized DC voltage (uzw), which is formed from an AC mains voltage (U) by means of a rectifier circuit (D1 to D4), a charging inductor (L1), a switch (V1), which is controlled by a control unit (2) and has its switching path connected in parallel with outputs of the rectifier circuit, and also a charge storage arrangement (D5, C1, C2, D6), which is connected once again in parallel with the switching path of the said switch. In this case, the charge storage arrangement (D5, C1, C2, D6) comprises a series circuit of charging diodes (D5 and D6) and two storage capacitors (C1, C2), whose common junction point is connected to a neutral conductor terminal (N) of the rectifier circuit.

Abstract: Device designed to control a coil forming part of a solenoid valve, for example in a contactor type device.A switching power supply 14 includes a winding S1 powering a control circuit 15 and another winding S2 placed with a switch T2 at the coil terminals. Switch T2 is controlled by the control circuit to power the coil in the hold phase starting from the switching power supply. This reduces disturbances during the hold phase.

Abstract: A method and apparatus for varying an electrically variable current limiting reactor (VICLR) ( 16) are provided in cooperation with an electrostatic precipitator automatic voltage control system. The inductance of VICLR (16) is varied by altering the DC current in control winding (66) of VICLR (16). A power source (10) connects serially to an inverse parallel SCR1 and SCR2, to VICLR (16), and to a TR set comprising a transformer (18) and rectifier (20) which supply power to precipitator (22). System electrical characteristics on both sides of the TR set are monitored. Computer (40) uses these monitored values to continuously calculate form factor and fractional conduction values. Step-down transformer (60) is connected to solid state relay (62) which is in turn connected to full wave bridge rectifier (64). Rectifier (64) is connected to control winding (66) of VICLR (16). Solid state relay (62) is also connected to computer (40).

Abstract: An inverter for converting DC power into AC power includes first and second subinverters having a plurality of controllable switches and three-phase outputs coupled to a summing transformer having wye and delta connected sets of primary windings and a set of secondary windings. The switches in the subinverters are controlled so that the subinverters produce first and second sets of pulse-width modulated subinverter waveforms which are summed by the summing transformer to produce the AC power in the secondary winding.

Abstract: An AC voltage regulator to be used to regulate voltage fluctuations both above and below a desired voltage output, the regulator including a regulator input connected with an AC power source, a regulator output connected with a load, and a single regulator transformer having a power winding and an inducing winding. The power winding is connected in series between the regulator input and the regulator output and the inducing winding, which is generally electrically isolated from the power winding, is structured and disposed to selectively induce a low voltage on the power winding. Further, a plurality of high frequency AC switches are included so as to variably set a plurality of connection topologies, each connection topology being specifically structured either to maintain voltage passing through the regulator constant, to step-up the voltage or to step-down the voltage, the various switches being variably positionable to provide for precise, gradual regulated adjustment of the output voltage.

Abstract: An electrically variable current limiting reactor which is usable in association with a power supply for an electrostatic precipitator is disclosed herein. The current limiting reactor is capable of having the inductance value thereof varied responsive to system operation conditions. Most particularly the inductance of the current limiting reactor can be modified responsive to the form factor of the sinusoidal AC input current to the power supply transformer. Additionally the inductance of the current limiting reactor can be controlled responsive to the fractional conduction of the full wave rectified current waveform at the output of the full wave rectifier of the power supply. Other conditions can be monitored to control the inductance value of the current limiting reactor such as physical system parameters. An automatic operating control may modify the inductance of the current limiting reactor responsive to the current entering the primary of the transformer of the power supply.

Abstract: Electric supply device for at least one metal vapor laser includes a convertor for converting an a.c. voltage into a d.c. voltage of fixed amplitude. Means are provided for supplying a pulse voltage with a maximum amplitude that can be regulated. An electric power charging circuit including a variable inductor is used for regulating the maximum amplitude of the pulse voltage for each laser.

Abstract: A voltage-doubler rectifier includes an ac fullbridge diode rectifier and a dc-to-dc converter having two output boost circuits. One of the output boost circuits is coupled between the rectifier and a dc link, and the other output boost circuit is coupled, with opposite polarity, between the rectifier and the circuit common. Two series-connected filter capacitors are also coupled between the dc link and the circuit common. In a preferred embodiment, the two output boost circuits each comprise either a series, parallel, or combination series/parallel resonant circuit and a rectifier. A switch is coupled between the junction joining one pair of diodes of the rectifier and the junction joining the two filter capacitors. For a relatively high ac line voltage, the switch is open, and the circuit operates in a low boost mode. For a relatively low ac line voltage, the switch is closed, and the circuit operates in a high boost, or voltage-doubling, mode.

Abstract: High efficiency, post regulation of auxiliary outputs in multiple output-power supplied is provided by connecting a regulating switching device in parallel with a filter inductor connected in the current path from the rectifiers to the output terminal. For minimum output power for that auxiliary output, the switching device is held off at all times. When increased power is required, the switching device is turned on for a short period during each cycle of the inductor voltage. The switching system may be configured to conduct current from the output end of the inductor to the input end of the inductor or vice versa or either one selectively, in accordance with the particular regulation scheme chosen. Efficiency is maximized since current flows in the switching device for only a small portion of each cycle of the inductor voltage.

Abstract: High efficiency, post regulation of auxiliary outputs in multiple output-power supplies is provided by connecting a regulating switching device in parallel with a filter inductor connected in the current path from the rectifiers to the output terminal. For minimum output power for that auxiliary output, the switching device is held off at all times. When increased power is required, the switching device is turned on for a short period during each cycle of the inductor voltage. The switching system may be configured to conduct current from the output end of the inductor to the input end of the inductor or vice versa or either one selectively, in accordance with the particular regulation scheme chosen. Efficiency is maximized since current flows in the switching device for only a small portion of the cycle of the inductor voltage.

Abstract: A power supply circuit comprising a transformer and rectifier diodes, where the ends of the secondary winding are connected to uniform first electrodes of a pair of rectifier diodes (D1, D2) whose second electrodes are connected to one output terminal (-) of the power supply circuit. According to the invention, also reactive components are provided, said reactive components being connected between the other output terminal (+) of the power supply circuit and the first electrode of respective ones of the rectifier diodes. When one reactance (e.g. L2) can send current (I.sub.L2) through one (D2) rectifier diode serving as an idler diode, while the secondary winding of the transformer draws current (I.sub.L1) through the same rectifier diode, a better utilization of the transformer is obtained than in the prior art, in particular when the output voltage is relatively low, while the output current is relatively high.

Abstract: A regulated voltage electrical power system has a driving section and a driven section. The driving section includes a power transformer primary structure and a ripple current carrying, driving winding of a filter system for the smoothed outputs circuits of the power system, each of which includes a single turn, driven filter winding magnetically coupled to the driving winding by a multi-path core structure. Each driven filter winding links that part of the multi-path structure which corresponds in cross-sectional area to the relative ripple voltage imposed by the power transformer on it. The power transformer secondaries for the outputs of the power system are also of a single turn each, differing output voltages being achieved by provision of differing number of primary winding turns associated with the various outputs. Planar diodes and core gap-filling ferrite inserts are provided in the secondary winding structures.

Abstract: A power transfer circuit includes first and second windings (L1, L2) sharing a common magnetic core (101). Each winding has associated with it a parallel capacitor to thus form a pair of "tank" circuits. The first winding (L1) is connected at one end to a voltage supply and, at the other end, to ground through an FET switch (100,200). The switch (100,200) is turned on and off at a predetermined frequency and at a 50% duty cycle. The second winding (L2) and associated capacitor (C2) achieves parallel resonance at the predetermined frequency. Similarly the combined first and second windings (L1,L2) and associated capacitors (C1,C2) achieve parallel resonance at said predetermined frequency. The second winding (L2) need not be electrically connected to the first winding (L1) which transfers energy to it through the magnetic core (101). The transfer circuit efficiently couples power across a dielectric interface to a pickup coil (L3).

Abstract: A power supply (20) incorporates a switching regulator circuit and a flyback transformer (26) having diodes (42) for unidirectional current flow from an output circuit of the transformer to a load (24). Substantially noise-free sensing of currents in both input (32) and output (34) windings of the transformer is provided by a sensing circuit composed of a sense winding (46) on the transformer and an integrator (50) coupled to the sense winding. The integrator provides an output signal proportional to volt seconds or flux which, in turn, is proportional to either the input current or the output current. The input current and the output current flow alternately due to a switching action of the regulator circuitry.

Abstract: A noise reduction circuit for a DC power supply in which the input of a high pass filter is coupled to the output circuit of the supply so as to receive a noise signal, the output of the high pass filter is coupled to the primary winding of a transformer via an amplifier, and the secondary winding of the transformer is coupled to the output circuit of the supply so as to reduce the noise therein.

Abstract: An inductor structure is combined with a ferroresonant regulator as a filter inductor in one instance, and as a regulating inductor in another. In one example, a ferroresonant voltage regulator includes a pair of shunt filters at its output to reduce the low order odd harmonic content of the AC output. The filtering arrangement includes two LC shunt filters having their independent inductor windings wound on a single magnetic core unit. Auxiliary windings coupled to each of the inductor windings are placed in series with the output to buck any remaining harmonics.In a second instance, independent regulating inductors in a multiphase ferroresonant regulator are also realized on a single magnetic structure.

Abstract: A dual programmable control time constant circuit is provided for a tap switching line voltage regulator of the type which selectively switches in a sequential adjacent one of a predetermined number of taps on a winding of a transformer. The dual programmable control time constant circuit includes a stepping counter and a first bistable device for determining how long a sensed signal representative of the voltage of the load circuit may be permitted to remain outside preset upper and lower limits before corrective action is taken. A second bistable device is used to reset the stepping counter when the sensed signal has changed so as to again fall within the preset limits for a predetermined time. The dual programmable control time constants provide for large variations in load characteristics with the minimum time required per tap change consistent with stable regulator operation. The surge current caused by excessive tap switching is reduced to prevent damage to the regulator and load components.

Abstract: A switched-mode power supply provides a plurality of directly regulated DC output voltages. The power supply includes a first inverter-coupled transformer for providing first and second DC output voltages, with a feedback loop provided from a first output to the inverter for regulating the first DC output voltage. A second transformer is coupled across the first and second output lines of the first transformer and is further coupled across the second output lines by means of a switching regulator circuit including a second feedback loop for regulating the second DC output voltage. By proper selection of the number of turns of the second transformer, the regulator is capable of either substantially increasing the second output voltage when the switching device is on while lowering the output voltage very little when the switching device is off, or increasing the second output voltage very little with the switching device on while substantially lowering the output voltage when the switching device is off.

Abstract: A high frequency power supply device has an inverter circuit and an output circuit connected thereto. The inverter circuit includes a diode and a capacitor being connected in parallel to an output side of a switching transistor. A drive input voltage of the switching transistor has a dead time during which a collector voltage thereof is inverted by resonance between the capacitor and a circuit inductance of the device. The switching transistor is turned on when the diode is turned on, thereby reducing the switching loss of the switching transistor. The output circuit includes a ferroresonant circuit or a magnetic amplifier circuit which has a saturable inductor.

Abstract: A voltage regulator system for receiving relatively high frequency electrical energy from a source and providing a regulated relatively low frequency electrical energy output wherein a passive device sensing means comprising only electrically passive elements senses the output voltage of the outputted relatively low frequency electrical energy and provides at least one output control signal proportional to the sensed output voltage, and at least one magnetic controller for receiving the control signal provided by the passive device sensing means and controllingly varying the relatively high frequency electrical energy in response to the received control signal to controllingly vary the voltage of the outputted relatively low frequency electrical energy to maintain the outputted relatively low frequency energy voltage at substantially a predetermined value.

Abstract: The voltage stabilization of the secondary outputs of switched mode power supplies is effected with high efficiency by means of a regulation circuit where the current feeding the storage capacitor (26) is flowing through the primary coil (32) of a transformer (72). One end of the secondary coil (33) of this said transformer (72) is connected to one end of the primary coil (32) via a diode (34), whereas the other end of the secondary coil (33) is connected to the other end of the primary coil (32) via another diode (35) and a switching element (36). The switching element (36) is controlled by a comparator circuit (38) comparing the voltage between the output connectors (40,41) with a reference voltage. In case the output voltage goes below the preset value the switching element (36) is shorted and the storage capacitor (26) is charged at the highest possible voltage.

Abstract: A battery plant is described which features magnetic circuit means in association with each of the battery strings in the battery plant for balancing the electrical current flow through the battery strings by equalizing the voltage across each of the battery strings. Each of the magnetic circuit means generally comprises means for sensing the electrical current flow through one of the battery strings, and a saturable reactor having a main winding connected electrically in series with the battery string, a bias winding connected to a source of alternating current and a control winding connected to a variable source of direct current controlled by the sensing means. Each of the battery strings is formed by a plurality of batteries connected electrically in series, and these battery strings are connected electrically in parallel across common bus conductors.

Abstract: A battery plant is described which features magnetic circuit means for balancing the electrical current flow through a pluraliircuitbattery strings which are connected electrically in parallel. The magnetic circuit means is associated with the battery strings such that the conductors carrying the electrical current flow through each of the battery strings pass through the magnetic circuit means in directions which cause the electromagnetic fields of at least one predetermined pair of the conductors to oppose each other. In an alternative embodiment, a low voltage converter is associated with each of the battery strings for balancing the electrical current flow through the battery strings.

Abstract: A switched mode power supply transformer, particularly for a television receiver, including a primary winding and a secondary winding with the primary winding and the secondary winding each being subdivided into a plurality of respective partial windings. The partial windings of the primary lie in a first group of chambers and the partial windings of the secondary lie in a second group of chambers of a chamber coil body, and the chambers of both groups are nested or interleaved with one another.

Abstract: A circuit having voltage regulated DC-output is provided, which may have balanced DC voltages with respect to zero, and which has only a single voltage sensing and power regulating means. The power regulator is on the input of a transformer having at least a bifilar wound secondary and a center tap. One or more pairs of balanced taps, one of each pair on either side of the center tap, are provided; and to each tap there is connected a pair of oppositely facing diodes, connected as to their polarity to provide positive or negative DC voltage with respect to zero; with similarily connected diodes from each pair of diodes at each tap being tied together at their output, facing the output of the circuit. In series with the output terminals of the circuit there are closely coupled, bifilar wound chokes, wound on a single core with isolated windings, and polarity connected to the respective outputs.

Abstract: Apparatus is disclosed for controlling the regulating inductance of a power supply by applying across a control winding mounted on the same core a voltage having a volt-second product proportional to the difference between a desired output voltage and the actual output voltage so that the frequency of response is the same under all operating conditions. In a preferred form, the apparatus is incorporated in a power supply having a source of DC pulses that are rectified to produce the output voltage and the volt-second product of the voltage applied across the control winding is proportional to the difference between the detected value of said pulses and a control voltage that is related to the difference between the actual output voltage and the desired value.

Abstract: A multiple-output DC-DC converter has an electronically controllable reactor (64,66) connected in series with each output circuit. In response to variations in voltage of the output circuits (80,82), control signals are fed back to vary the permeance of the electronically controllable reactor (64,66) in each output circuit. The voltage in any output circuit is thereby made independent of input voltage variations and load fluctuations in any other output circuit.

Abstract: A charge-discharge current stabilizer for storage batteries includes a rectifier having a control element and connected in series with a switch and storage batteries in a charge-discharge circuit. The stabilizer also includes a system to control the rectifier, having a current sensor in the form of an electromagnet with a movable armature. A transducer converting electric signals to pneumatic signals is mechanically coupled with the armature of the current sensor. A pneumatic drive is pneumatically coupled with, and controlled by, the transducer. The control element of the rectifier has a slide operatively associated with an operating member of the pneumatic drive.

Abstract: In a transformer-rectifier converter system, at least one inductance is inserted in the commutation path of two adjacent diode or thyristor devices in a cluster of three devices related to a common DC polarity pole, the reactance due to such inductance being sufficient to lengthen the commutation overlap thereby to minimize AC line harmonics. The invention is applicable to AC/DC as well as to DC/AC conversion.

Abstract: A linear power supply is preregulated to compensate for variations in load and power line voltage. The inductance on the primary side of the power supply step down transformer is varied by a current controlled inductor to efficiently maintain the desired power supply output voltage. A variable current is supplied to the inductor by a d.c. power source under control of an integrator which monitors output voltage fluctuations. In one embodiment of the invention, a voltage selector is included for use with power supplies which provide more than one output voltage. This selector automatically selects the most heavily loaded output voltage for control of the inductor.

Abstract: In a transformer power supply, a full wave rectifier is series connected in circuit with the primary winding of the transformer such that the current flowing through the primary winding of the transformer flows in series through the input of the full wave rectifier. An inductive load is connected across the output terminals of the full wave rectifier such that the rectified output current flows through the inductive load. The full wave rectifier preferably uses silicon controlled rectifiers which are phase triggered in such a manner so as to control their conduction angles so as to control the power flow from the source to the load connected to the secondary of the transformer. The inductance of the load for the rectifier preferably exceeds the critical inductance so as to minimize ripples in the secondary of the transformer. This type of power supply circuit is particularly useful for supplying power to an electron gun which is subject to arcing.

Abstract: Voltage converter apparatus is disclosed having circuitry for regulating the output voltage to maintain it at a regulated value. Use is made of switching devices that switch between their alternative states in a cyclic manner and at a particular frequency which is determined by the circuit constants. An inductance is provided for modifying the waveform of the current fed to the output transformer, so that at certain periods of the cycle there is a lesser contribution to the integrated output--i.e., the output is not a true 1:1 square wave. Then, by changing the switching intervals, the integrated output can be controlled. A current transformer is provided for sensing current changes occurring in the output transformer, and a short circuit arrangement is provided for short circuiting a control winding of the converting transformer to control the instants of switching of the switching devices.

Abstract: Shunt regulation for a high-voltage circuit including a ferroresonant transformer has control circuitry associated with a low-voltage control winding on the transformer, the control winding being magnetically coupled with the high-voltage secondary winding thereof. The control circuitry includes a zener diode for clamping peak voltages on the control winding and a sub-circuit including a voltage-divider and a capacitor. An averaged voltage from the divider/capacitor is compared with a reference by a comparator. Both the comparator and the zener diode serve to turn on a transistor connected across the control winding output, thereby allowing current to flow through the control winding, dropping the output voltage thereof. Regulation of the output voltage on the transformer high-voltage secondary results.

Abstract: This closed loop potential regulated ac-dc power supply comprises a power transformer having two secondary windings and a compensating transformer having two compensating windings connected individually in series circuit with the principal power supply secondary windings. The other secondary windings on the power transformer supply exciting windings for compensating variations in output potential by control of the compensating transformer control circuitry which has an input circuit connected across the load and an output for varying the ac supply to the exciting windings inversely of variations in load potential. A differential amplifying circuit is used for determining the load potential error and driving a transistor effectively to insert a dc component in inverse feedback relationship into the exciting windings of the compensating transformer. As the output potential error increases, the control current is decreased, and conversely.

Abstract: A rectifier unit for 3-phase a.c. to d.c. conversion is of the type having a transformer with a star-connected and a delta-connected secondary the outputs of which are rectified and combined to give 12-pulse operation. To reduce the danger of current imbalance between the two secondaries, a compensating transformer unit is interposed between the secondaries and the rectifiers which modifies the signals such that any difference in the current drawn from one secondary compared with the other tends to equalize the current drawn from the secondaries. The compensating transformer unit can take the form of 3 individual transformer units but is preferably a single transformer with 3 limbs, each of which carries a main winding connected to one secondary and two opposed subsidiary windings which receive the phases from the other secondary which are closest to and on either side of the phase of the associated main winding.

Abstract: An alternating to direct current power converter utilizing dynamically controlled electromagnetic induction. A feedback system controls permeance within a network of magnetic paths by progressive saturation or domain rotation within selected portions of the paths to provide unidirectional direct current power from an ac input.

Abstract: A programmable negative resistance circuit, transformer coupled to the low-voltage high-current output conductors of the center-tapped secondary winding of a switching power supply transformer, maintains a constant voltage output irrespective of large load current variations.

Abstract: An uninterruptible power supply derives regulated power from either a primary power source or a reserve power source. A power flow control unit derives the output power as needed from either one or both power sources. Its operating characteristics are selected so that complicated transfer and disconnect circuitry is eliminated.