Abstract: An electric vehicle charging system includes an interleaved DC-DC control system configured to facilitate providing electric charge to an electric vehicle battery and includes a controller communicatively coupled to the interleaved DC-DC control system. The interleaved DC-DC control system includes an inrush current limiting circuit, three parallel boost converters that are each configured to operate in a discrete phase, and unidirectional current circuitry. The controller includes electronic control circuitry configured to control the interleaved DC-DC control system and vehicle communication circuitry configured to establish charging protocols between the interleaved DC-DC control system and the electric vehicle battery.

Abstract: A power conversion device includes a first bridge circuit, a second bridge circuit, and an inductance element connected between a first AC terminal of the first bridge circuit and a second AC terminal of the second bridge circuit. The controller calculates a passing current passing through the inductance element based on a difference between a first alternating current flowing between the first AC terminal and the inductance element and a second alternating current flowing between the second AC terminal and the inductance element, and detects a first DC component included in the passing current. The controller changes a duty in at least one of the first AC voltage and the second AC voltage to cancel the detected first DC component, the duty being a ratio of a positive potential period and a negative potential period.

Abstract: Aspects of the subject disclosure provide a reader device for managing operation of an automatic gain control (AGC) sub-circuit on a host device computing device. In some implementations, a reader device of the subject technology can include a controller, a noise generator, noise coupling circuitry, and a 3.5 mm audio plug including an audio bus that is configured for insertion into a headphone port of a host device, such as a smart phone or tablet computer. Upon connection of the reader device to the host computing device, the reader device can provide an intentional noise signal to the host device via a signal path where the intentional noise signal is configured to establish a substantially stable gain amount at the AGC sub-circuit.

Abstract: Embodiments of the present invention describe a voltage converter and a method for operating the voltage converter. In one embodiment the voltage converter includes a primary path configured to generate a pulse modulated voltage or current from an input direct current (DC) voltage, a transformer arrangement with m?1 primary windings and n?2 secondary windings inductively coupled together, the m primary windings being connected to the primary path, and a secondary path configured to output a pulsed direct current (DC) voltage or current, wherein the secondary path includes n capacitors connected in series and n secondary controllable semiconductor switches, and each of the n secondary windings is connected via at least one of the secondary controllable semiconductor switches to at least one of the capacitors.

Abstract: A residual magnetic flux estimation device 1 includes a DC power-source control device 11 which controls a DC power source 300 to apply a DC voltage across two terminals of a ? connection that is a secondary winding or a tertiary winding, a voltage measuring device 12 which measures a terminal voltage at the primary side of a three-phase transformer 200, a computing device 13 that determines a phase having a high voltage between the two phases other than the phase to which the voltage is applied, and a residual magnetic flux measuring device 14 that measures a phase-to-phase residual magnetic flux between the two phases other than the high-voltage phase, and estimates a measured value of the phase-to-phase residual magnetic flux as a maximum residual magnetic flux in the measurement-target three-phase transformer.

Abstract: The invention relates to a push-pull converter (4) comprising a primary-side input converter circuit (44) with a plurality of primary-side switching devices (31, 32, 33, 34) in a full-bridge circuit, said input converter circuit being designed to convert an input DC voltage (42) into a first AC voltage, and comprising a transformer (39) with a primary-side winding and a ON secondary-side winding, said transformer being designed to receive the first AC voltage on the primary-side winding and to generate a second AC voltage on the secondary-side winding. The push-pull converter also comprises a secondary-side output converter circuit (45) which is designed to convert the second AC voltage into an output DC voltage (43), comprising a first semi-bridge circuit, said semi-bridge circuit comprising a first secondary-side switching device (35), a second secondary-side switching device (37), and a first center to that is connected to a first connection of the secondary-side winding.

Abstract: A voltage application unit causes switching elements to apply voltage to flow an electric current into corresponding windings to generate a revolving magnetic field. A period derivation unit derives an energization period of the windings. A signal generation unit generates a PWM signal for causing the voltage application unit to activate and deactivate the switching elements, such that a duty ratio decreases gradually in a predetermined time period subsequent to the derived energization period. A period specifying unit specifies a detection period of an electric current, which is supplied from the switching elements presently switched and deactivated, by a predetermined time period between an edge, which is caused when the PWM signal changes in level to deactivate the switching elements, and a time point in advance of the edge in the energization period.

Abstract: A first rectifier diode is electrically connected between a first input terminal where an alternating current (AC) power is received and a first output terminal where a direct current (DC) power is output. A second rectifier diode is electrically connected between the first input terminal and a second output terminal. The first and second rectifier diodes rectify first and second portions of the AC power into the DC power, respectively. When switching of a plurality of power factor correction (PFC) switches is enabled, the plurality of PFC switches increases a voltage of the DC power to greater than a peak voltage of the AC power. An inductor is electrically connected between a second input terminal and two of the plurality of PFC switches. When the switching is disabled, first and second bypass diodes provide a current path past the plurality of PFC switches and the inductor.

Abstract: In general, in one aspect, the invention relates to a method for delivering a controlled voltage. The method involves, during a first electric pulse delivered to a primary transformer, holding a first switching section open to isolate the controlled voltage, where the first electric pulse creates a first magnetic flux in a core of the primary transformer, and where the first magnetic flux generates a direct current (DC) magnetizing current. The method further involves receiving the controlled voltage from a voltage source using the DC magnetizing current at a first switching section, and upon termination of the first electric pulse, closing the first switching section to deliver the controlled voltage to the primary transformer.

Abstract: An apparatus for monitoring current for a motor drive including at least high-side and low-side switching transistors includes a driver circuit for driving a gate of the low-side switching transistor. First circuitry measures a drain to source voltage across the low-side switching transistor and generates a voltage output responsive thereto. Second circuitry has a first state of operation that samples the voltage output of the first circuitry when the low-side switching transistor is turned on and has a second state of operation to sample the voltage output of the first circuitry when the low-side switching transistor is turned off. The second circuitry further generates a monitored output current responsive to the sampled voltage output.

Abstract: In accordance with an embodiment of the present invention, a semiconductor memory device includes an array of thyristor-based memory formed in a silicon-on-insulator (SOI) supporting substrate. A portion of the supporting structure of the SOI substrate has a density of dopants sufficient to assist delivery of a bias to the backside of an insulating layer beneath a thyristor of the thyristor-based semiconductor memory. By enabling biasing of the substrate at the backside of the insulating layer beneath the thyristor, a back-gate control is available for controlling or compensating the gain of a component bipolar device of the thyristor with respect to temperature.

Abstract: Switching device for linking various electrical voltage levels in a motor vehicle, in which a drive voltage level has an electric drive machine which may be actuated by a power converter, and a drive energy accumulator which is associated with an intermediate circuit, and in which the drive voltage level is connected to a vehicle electrical system voltage level by an electrical converter. The electrical converter is designed as a coupling circuit which is connected at the drive side to at least one node point of a winding circuit of the electric drive machine and to a voltage potential relative to the intermediate circuit. The coupling circuit is connected at the vehicle electrical system side to the vehicle electrical system via a switching unit which has at least one non-diminishing, finite impedance.

Abstract: In accordance with an embodiment of the present invention, a thyristor-based semiconductor memory device may comprise an array of thyristor-based memory formed in an SOI wafer. A supporting substrate may be formed with a density of dopants sufficient to assist delivery of a bias level to the backside of an insulating layer beneath a thyristor. Such conductivity within the substrate may allow reliable back-gate control for the gain of a component bipolar device of the thyristor.

Abstract: A semiconductor device includes an anode electrode in Schottky contact with an n-type drift layer formed in an SiC substrate and a JTE region formed outside the anode electrode. The JTE region is made up of a first p-type zone formed in an upper portion of the drift layer under an edge of the anode electrode and a second p-type zone formed outside the first p-type zone having a lower surface impurity concentration than the first p-type zone. The second p-type zone is provided 15 ?m or more outwardly away from the edge of the anode electrode. The surface impurity concentration of the first p-type zone ranges from 1.8×1013 to 4×1013 cm?2, and that of the second p-type zone ranges from 1×1013 to 2.5×1013 cm?2.

Abstract: Method and apparatus are disclosed for controlling the delivery of power to DC components such as computer components, microprocessors or the like. Designs of voltage regulation modules are presented which are appropriate for faster components, lower voltages, and higher currents. Embodiments are especially suited to applications which cause rapid changes in the conductance of the load, even in the sub-microsecond time domain as is common in computer applications and the like and in powering electronics equipment, especially a distributed system and especially a system wherein low voltage at high current is required.

Abstract: A circuit for controlling the welding power of a welding power supply includes a control circuit, a switch, and an isolation circuit. The control circuit is configured to generate a command signal. The isolation circuit has a flyback transformer and is configured to receive the command signal and to provide a switch drive signal to the switch in response to the command signal. The switch provides welding power in response to the switch drive signal.

Abstract: A capacitor power supply unit for generating an auxiliary direct voltage supply from a main alternating voltage supply for powering an electrical consumer includes a storage capacitor and a charging capacitor. The storage capacitor provides an auxiliary direct voltage supply for powering an electrical consumer and the charging capacitor is operable for charging the storage capacitor with current generated by a main alternating voltage supply. Rectifying means rectify the current charging the storage capacitor. Switching means switch between first and second switch positions for enabling the charging capacitor to charge the storage capacitor and for disabling the charging capacitor from charging the storage capacitor. A switching time-determining member provides a switching time control signal to the switching means as a function of voltage output by the charging capacitor.

Abstract: The present invention prevents an increase in an overvoltage and increases an optimum operating voltage of a power inverter. A photovoltaic power generation device is provided with a solar cell device 1, a power inverter 2 for inverting output from the solar cell device 1 into AC power, a current path circuit 3 connected in parallel between the solar cell device 1 and the power inverter 2, and a current detection circuit 4 for detecting a current feeding back to the solar cell device 1. When a current detected by the current detection circuit 4 reaches beyond a predetermined current value, the current path circuit 3 is cut off.

Abstract: A switching power supply device has a configuration in which a series combination of a first switching circuit and an input power source is connected in series with a series combination of a primary winding of a transformer and an inductor, a series combination of a second switching circuit and a capacitor is connected in parallel to the series combination of the primary winding of the transformer and the inductor, and the secondary winding of the transformer is provided with a rectifying smoothing circuit including a rectifying element. The first switching circuit is made up of a parallel connection circuit including a first switching element, a first diode, and a first capacitor. The second switching circuit is made up of a parallel connection circuit including a second switching element, a second diode, and a second capacitor.

Abstract: A transformer, typically a miniature transformer, to provide low-voltage power between, usually, 2 to 12 V from a power network has an auxiliary winding (6) inductively coupled to the core (9) of the transformer. A reference signal is provided from the power supply, and a monitoring circuit (32), which includes a difference-forming circuit (16) is coupled to receive (a) a signal from the auxiliary winding (6) and (b) the reference signal, the difference-forming signal providing an output in dependence on the state of magnetization of the core, by evaluating differences in magnetization (.DELTA.B) depending on whether power is being supplied by the transformer, or not. A circuit interruption element (10), typically a transistor, is serially connected between the power supply (1, 2) and the transformer.

Abstract: A voltage converter circuit uses a silicon-controlled rectifier for converting input voltage to selected levels of output voltage. The silicon-controlled rectifier is connected in a circuit including a capacitor which oscillates between charging and discharging to produce a resulting waveform that is applied to a transformer for developing high positive and negative output voltages. Pulses are produced which are asynchronous with alternating line signal. Since the silicon-controlled rectifier operates on DC voltages, an electrolytic capacitor of high capacitance values can be connected between the silicon-controlled rectifier and AC or DC supply lines to substantially reduce noise signals conducted back into the supply line.

Abstract: A control system for a power converter which is composed of a plurality of self-turn-off devices and is connected to an outer system through a transformer provided with a core. The control system includes an output voltage instruction value generating circuit for generating an instruction value for an output voltage of the power converter. The control system also includes a correction circuit for correcting the instruction value based on a magnetic flux relating value of the core of the transformer to generate a corrected instruction value for the output voltage of the power converter. The control system further includes a gate pulse generating circuit for generating a gate pulse based on the corrected instruction value. The gate pulse is applied to the self-turn-off devices of the power converter to control the output voltage of the power converter. Whereby DC magnetization of the transformer is suppressed even for the case when DC component is generated by the outer system.

Abstract: A relatively small and compact high voltage, high current power supply for a laser utilizes a plurality of modules containing series resonant half bridge inverters. A pair of reverse conducting thyristors are incorporated in each series resonant inverter module such that the series resonant inverter modules are sequentially activated in phases 360.degree./n apart, where n=number of modules for n>2. Selective activation of the modules allows precise output control reducing ripple and improving efficiency. Each series resonant half bridge inverter module includes a transformer which has a cooling manifold for actively circulating a coolant such as water, to cool the transformer core as well as selected circuit elements. Conductors connecting and forming various circuit components comprise hollow, electrically conductive tubes such as copper. Coolant circulates through the tubes to remove heat. The conductive tubes act as electrically conductive lines for connecting various components of the power supply.

Abstract: A DC/DC power transformer is provided which is an arrangement for direct transformation of high electric power from one DC voltage level to another DC voltage level without an intermediate AC voltage network. The DC voltage is today basically used for transmission of high electric power at long distances. The DC voltage levels for these transmissions are normally high. The DC/DC power transformer allows several DC voltage levels to be used in one and the same DC voltage network. The principle for this arrangement is that the valve windings (43, 45) from one or several converter transformers (47) are connected to two valve bridges, which generate opposing cyclically variating magnetic flows in the transformer cores (44). One of the valve bridges is operated as an inverter (42) and the other as a rectifier (46) and in this manner the power is transformed from one DC voltage level (U.sub.d1) to another (U.sub.d2).

Abstract: A DC/DC power converter suitable for high power applications has an input converter which converts the DC input voltage to an AC voltage and supplies this voltage to a transformer. The output of the transformer is provided to an output converter which converts the AC to a DC output voltage at a controlled level to a load. Both the input and output converters are composed of active gate controlled switching devices and are switched in a soft-switched manner to minimize switching losses and increase switching frequency. The converters can be implemented in single phase or polyphase configurations and can be controlled to closely maintain the output voltage provided to the load at a desired level.

Abstract: An inverter comprises a pair of reactors connected in series between a positive arm element and a negative arm element, snubbers each connected in parallel to respective arm elements, and a feedback circuit for transferring electrical energy stored in the snubbers back to the d.c. power source. The feedback circuit includes a self turn-off switching device which is controlled to become conductive during a certain period in correspondence to the on-off operation of the arm elements so that energy stored in the snubbers is fed back to the d.c. power source through a current transformer and a rectifying circuit during the on-state of the device.

Abstract: Apparatus for producing an impulse welding current which can be used in shielded-arc welding. The apparatus includes a thyristor connector in a series circuit to a primary winding of an impulse transformer and a second thyristor and a compacitor, the secondary winding of the impulse transformer being connected to a diode to the welding arc. The apparatus increases the coefficient of the impulse welding current and reduces the steepness of the positive fronts of the voltage imposed upon the thyristors.

Abstract: Energy trapped in the snubbers connected to a dc-ac power converter is more efficiently restored to the dc source by means of an energy recovery transformer with a reset circuit branch for improving the reset of the transformer following a period of energy recovery. The reset circuit branch damps out oscillations between the recovery transformer and the overcharged shunt capacitive snubber and may also be used to dissipate the magnetizing current of the energy recovery transformer.

Abstract: A method and apparatus for generating a supply of pulsed power to an electrostatic precipitator where a residual collection field is maintained on the electrodes during interpulse periods while, in addition, high voltage pulses in excess of the residual are periodically impressed on the electrodes. The apparatus includes a series tuned circuit having a pulse forming section which creates a single damped cycle of oscillation to produce ionization current from a corona discharge electrode before unused power is returned to the pulse forming section. A blocking diode prevents the voltage on the precipitator from falling below the corona threshold voltage, and a series tuned trap circuit maintains the diode in conduction during pulsing to allow the return of unused energy.

Abstract: A DC voltage converter apparatus is provided to convert a fluctuating input DC voltage into an isolated and regulated output DC voltage by operation of a first switch device for charging a capacitor through one primary winding of a transformer and a second switch device for discharging the capacitor through a second primary winding of that transformer. A load is energized by an output voltage from a first secondary winding when the first switch is conducting and is energized by an output voltage from a second secondary winding when the second switch is conducting. The first and second switching devices are controlled in response to the voltage change across the capacitor.

Abstract: The invention relates to a high-voltage generator for supplying two different output voltages or output currents, particularly for X-ray tubes whose anode current deviates from the cathode current. Symmetrical output voltages can be obtained during operation of this device, despite asymmetrical loads to the anode and cathode, by using a resonant direct current/alternating current converter with a capacitor circuit which is discharged through two different primary windings. The discharge through one primary winding takes place with a preferably adjustable delay with respect to discharge through the other primary winding.

Abstract: An industrial plating system operative from a relatively high voltage, 60 Hz, three phase a-c source for providing a relatively low voltage pulsed d-c for delivering currents above around 1,000 amperes to plating load and including amplitudes of 3,000 to 5,000 amperes, and including a controlled rectifier operative with the a-c source to provide a rectified d-c output voltage of a preselected high amplitude, an inverter operative with the controlled rectifier and situated at substantially the same physical location for providing a pulsed a-c output of a preselected width and a-c frequency, the a-c frequency being from around 300 Hz to 3000 Hz, a high frequency rectifier operative with the inverter for providing plating loads with a rectified pulsed d-c having d-c amplitude and a preselected pulsed d-c frequency, the pulsed d-c frequency being greater than the preselected a-c frequency, the high frequency rectifier having a high frequency step down power transformer and a pair of high speed diodes operative in

Abstract: A power converter which converts alternating current (AC) utility power or direct current (DC) power to any DC output voltage by use of at least one switch and a resonant circuit resulting in power conversion by means of sinusoidal waveshapes. The resonant circuit defines the frequency of operation of the commutation circuit such that the frequency changes only a moderate amount with loads ranging anywhere from an open circuit to a short circuit, thereby providing reliable commutation and circuit operation under all load conditions.

Abstract: A stabilized power supply which is particularly suitable for use at very high voltages derives its energy from a resonant inverter feeding a transformer and rectifier. The power supply is intended to be operated in a pulsed mode with the generation of each pulse reducing the output voltage below its required value. The output capacitive stages of the power supply are subsequently re-charged and an input switch is rendered non-conductive when the output voltage regains its required value. As it is not possible to switch off a resonant inverter during the course of a cycle, the energy obtained from the inverter during the remainder of the current cycle is fed into another capacitive stage. The second stage may also be utilized as an unregulated output rail of the power supply. The invention is particularly suitable for power travelling wave tube amplifiers.

Abstract: A power supply for electrostatic apparatus provides a high voltage output. The high voltage output is provided by the half wave rectification and filtering of a pulse signal from a secondary winding of a high voltage pulse transformer. The primary winding side of the high voltage pulse transformer is connected in a series loop circuit with a capacitor and a switching device. The capacitor is charged through an input choke connected to a DC supply source. The switching device is triggered after the capacitor is charged such that the capacitor is discharged through the primary winding of the high voltage transformer. The inductive collapse of the high voltage output transformer provides for the turnoff of the switching device and also serves to partially recharge the capacitor. The half wave rectified high voltage output of the power supply is obtained from the recovery pulse of the high voltage pulse transformer.

Abstract: A field controlled thyristor or a field terminated diode is used in a gate assisted turn off mode in a resonant circuit commutated switching dc/dc converter to convert power from one voltage level to another voltage level. A diode allows energy trapped in stray inductances to be delivered directly to the load rather than be dissipated in snubber resistors.

Abstract: A D-C voltage converter for controlling the voltage at an inductive load. The circuit is provided with a pulse transformer having first and second primary windings, a secondary winding, and a demagnetizing winding. The second primary winding receives a D-C voltage from a main D-C voltage supply by means of a controlled thyristor. The thyristor in combination with the first primary winding induce currents in the second primary winding and the secondary winding, which maintain a charge on a battery and which supply the inductive load. Electrical energy from the battery is used to produce a countervoltage for extinguishing a thyristor. In addition, circuitry is provided for extinguishing the conduction of the controlled thyristor.

Abstract: A voltage converter circuit for providing electrical energy to a capacitive load, the converter circuit having a pulse transformer having primary and secondary circuits. Pulse signals are provided in the primary circuit by thyristor devices. The thyristors are quenched by circuitry contained in the secondary circuit, comprising a storage capacitor which conducts a quenching current through a bank of power transistors to at least a portion of a secondary winding. A magnetizing current from a further secondary winding in the secondary circuit is utilized to charge the capacitor.

Abstract: This device comprises a rectifier-inverter supplied with current by the mains and adapted to deliver a charging current to the battery in the course of the charging periods of the battery and to restore to the mains the discharge current of the battery in the course of the discharging periods of the battery, a direct current chopper for chopping the current of the battery at an available conduction rate in the course of the simulation of the cycle of operation, a switch connected between the rectifier-inverter and the chopper and circuits for automatically controlling the chopper, the switch and the rectifier-inverter as a function of the cycle of operation of the battery to be simulated.

Abstract: In an inductor-convertor circuit for transferring electrical energy between a storage coil and a load coil using a storage thyristor bridge, a load thyristor bridge, and a set of commutating capacitors, operation is improved by a method of changing the rate of delivery of energy in a given direction. The change in rate corresponds to a predetermined change in phase angle between the load bridge and the storage bridge and comprises changing the phase of the bridge by two steps, each equal to half the predetermined change and occurring 180.degree. apart. The method assures commutation and minimizes imbalances that lead otherwise to overvoltages.

Abstract: A monolithie multijunction solar cell is modified by fabricating an integrated circuit inverter on the back of the cell to produce a device capable of generating an alternating current output. In another embodiment, integrated circuit power conditioning electronics is incorporated in a module containing a solar cell power supply.

Abstract: A "chopper" type armature current control system for a D.C. motor when connected across the output of a rectifier, A.C. to D.C. type supply source that is characterized by having closed-loop regulating control, and having overhauling load energy dissipating circuit which is automatically connected between the motor armature circuit and the low potential side of the source output whenever the potential across the output sides of the source exceeds a predetermined value. A modified form provides addition of a fixed D.C. potential to afford enhanced speed of system response, and controlled slow speed reverse operation of the motor.

Abstract: A commutation circuit for thyristors alternately turned ON by pulse width modulation (PWM) for the generation of a fundamental sine wave is characterized by two separate primary windings associated with respective positive and negative thyristors with a common secondary winding at the output, and two commutating networks for the respective poles, each including an auxiliary thyristor for fixed-commutation and the resonant combination of a capacitor and an inductor. The thyristors, the commutating networks, the DC source, and the output transformer have a symmetrical disposition as well as symmetrical commutation steps.

Abstract: A frequency converter of the series-capacitor type is made substantially insensitive to changes in output load by providing the same with means for limiting the voltage across the transformer and load capacitor or capacitors thereof to a pre-determined value.

Abstract: An input rectifier supplies d-c energy for an auxiliary-commutated inverter. A logic circuit provides gating signals for the semiconductor switches in the input rectifier circuit and in the inverter circuit. A pre-charge circuit provides an independent path to charge the commutating capacitor in the inverter when the system is energized. The gating signals to the input rectifier are delayed by a predetermined time interval, allowing the commutating capacitor in the inverter to be charged and thus ensure effective commutation when the inverter commences operation.

Abstract: A three phase AC to DC voltage converter includes separate single phase AC to DC converters for each phase of a three phase source with the DC voltage output of the three converters paralleled and controlled to provide necessary regulation. Each of the single phase AC to DC converters includes a full-wave bridge rectifier feeding a substantially resistive load including an inverter and a second single phase full-wave bridge rectifier. To the extent that each inverter and second single phase full-wave bridge rectifier approximate a resistive load, the source current harmonics are reduced. Additionally, the triplen harmonics produced in the three phase source lines by each of the three AC to DC converters are cancelled by the triplen harmonics produced in the three phase source lines by the remaining two AC to DC converters.

Abstract: An apparatus for skin therapy employs a circuitry for generating a high voltage that is connected to an electrode. The circuitry to step up voltage from a power supply includes a transistor, transformer and rectifier; and the means to control application of the stepped up voltage to an electrode coil or transformer includes a silicon controlled rectifier in series with a capacitor and an output transformer's primary. Pulsing means, having voltage supplied from a power source on a separate circuit, to control the rate of silicon controlled rectifier firing and therefore discharge of the capacitor includes a unijunction oscillator and transistor. The output transformer's secondary powers the electrode.

Abstract: A power supply capable of transferring power at high current and voltage levels to a load which may be highly inductive. The power supply includes an inverter for receiving DC power and inverting it to an AC intermediate signal. The intermediate signal is rectified by a converter to provide a DC output voltage to a load. Commutation of the controlled rectifying devices within the inverter and converter are provided by capacitors connected across the output terminals of the inverter. The DC output voltage provided to the load is controlled by the frequency of the firing signals provided to the controlled rectifying devices within the inverter. A large energy storage inductor, which may be superconductive, is connected to the inverter and may be utilized to provided the pulses of power required by the load. A converter connected to an AC power system is provided to supply external power and to recharge the current flowing in the energy storage inductor.

Abstract: A semi-conductor controlled rectifier (SCR) d.c. interrupter in which any (optional) number m of identical, self-contained and parallel connected phases each form an identical series connection of a semi-conductor controlled retifier (Th.sub.1) . . . (TH.sub.m) and a diodes (D.sub.1 . . . (D.sub.m). An m number of identical, self-contained resonant arms are arranged in star or Y-connection, with any of the arms having an identical series connection of a capacitor (C.sub.1) . . . (C.sub.m) and a reactor (L.sub.1) . . . (L.sub.m) respectively. The star vertices are connected between the cathodes of the semi-conductor controlled rectifiers (Th.sub.1) . . . (Th.sub.m) and the anodes of the diodes (D.sub.1) . . . (D.sub.m). The star neutral is associated with the d.c. power source (BA) positive or negative pole.

Abstract: A bilateral chopper is used between an inverter and the standby battery of an uninterruptible power supply, the battery being charged through rectification of the AC power by the feedback diodes of the inverter under controlled voltage by the chopper, the load being supplied with AC power under controlled voltage by the chopper from the standby battery in case of failure of the AC power supply.