Abstract: A power converter controller and a method for controlling a power converter are provided. The power converter includes first and second power transformers, each having first and second primary windings and a secondary winding; and first and second switches that alternately couple primary windings of the first and second power transformers to an input power source. The power converter controller receives a feedback signal, such as a DC power output voltage from the power converter. A voltage controlled oscillator responsive to the feedback signal provides a variable frequency signal. A phase shift controller coupled to the voltage controlled oscillator provides a variable phase shifted signal responsive to the variable frequency signal. Gate drive signals are decoded using the variable frequency signal and variable phase shifted signal for driving first and second switches of the power converter.

Abstract: A power conversion system for driving a load is provided. The power conversion system comprises a power transformer having at least one primary winding circuit and at least one secondary winding circuit, the primary winding circuit being electrically connectable to an AC power source. The system further comprises at least one power cell, each of the at least one power cell having a power cell input connected to a respective one of the at least one secondary winding circuit. Each power cell also has a single phase output connectable to the load. A power switching arrangement including at least one power switch is connected to the power cell input and a DC bus, and a switch controller is connected to the power switching arrangement and the power cell input. The power cell also has a PWM output stage having a plurality of PWM switches connected to the DC bus and the single phase output. A local modulation controller is connected to the PWM output stage.

Abstract: An electric energy converter comprises N transformers each including a primary winding and a secondary winding, a primary circuit connected to two input terminals on which the primary windings of the transformers are connected, a secondary circuit connected to two output terminals on which the secondary windings of the transformers are connected. Each primary and secondary circuit includes a set of switching devices connected to N primary windings and N secondary windings, where the converter further comprises a controller configured to control the switching devices of at least one of the primary or secondary circuits, the switching devices being connected to associate the N primary or secondary windings in a series and/or parallel arrangement by using the controller.

Abstract: An embodiment of the present invention comprises a multi-level PWM inverter that is constructed by cascading multi-level H-bridge inverters and providing different voltage inputs to the multi-level H-bridges. The values of the voltages, or the ratios of the voltages, are selected in order to provide an increased number of output levels. In the cascaded arrangement, at least one of the multi-level H-bridge inverters has more than three levels. Preferably, at least one of the multi-level H-bridge inverters is a 5-level inverter. According to one aspect of the invention, the cascaded arrangement may use a primary 5-level H-bridge with at least one 3-level H-bridge (referred to as a “5/3H” arrangement). This arrangement can provide up to fifteen output levels if regenerative voltage sources are used, and up to eleven output levels if a non-regenerative voltage sources are used.

Abstract: A DC power supply device includes transformers that operate with an enhanced efficiency and can reduce the factors that generate ripples in the output voltage to make it possible to downsize the transformers and the smoothing filters of the device, reduce the loss attributable to the switching elements during its constant power output operation and also downsize the heat sink fins so that the overall dimensions of the power supply device may be reduced. The DC power supply device also comprises a pair of switching changers, two output transformers and two rectifying/smoothing sections for rectifying the respective outputs of the switching changers. Each of the two switching changers has the same switching cycle period and the striking phases of the switching elements of one of the switching changers and those of the switching elements of the other switching changer are made variable.

Abstract: The present invention is a direct conversion programmable power controller that receives polyphase input power that has an input power frequency a polarity. The controller includes a primary chopper for each phase of electrical power. Each primary chopper is electrically connected in wye connection to a transformer. A secondary chopper demodulates and rectifies each phase of power. Each secondary chopper has an input connected electrically to the secondary terminals of the transformer and has an output connected to a load in series connection.

Abstract: An AC-DC converter that includes a plurality of power conversion units that overlay their signals to generate a DC signal with low voltage level, small voltage and current ripples, but high DC current. The DC signal is further filtered by a LC low pass filter to further minimize the ripples before output to the load. In one embodiment, the plurality of power conversion units is preferably powered by a plurality of input pulse generators. In an alternative embodiment, the power conversion units is powered by a input pulse generator circuit that includes a plurality of n-channel MOSFETs arranged in a full bridge configuration whose gate voltages are controlled by a plurality of pulse generators.

Abstract: A power generation apparatus includes a permanent-magnet AC generator, a first converter for converting AC power into DC power, and a second converter for converting the DC power produced by the first converter into AC power. The first converter includes a unit for controlling active power and a unit for controlling reactive power and the second converter includes a unit for controlling a voltage of a DC system and reactive power or AC voltage of a power system.

Abstract: A logic input circuit for an industrial equipment automatic control system supplied by a DC voltage source, in particular a battery (16), comprises a voltage step-up energy converter (12) composed of an inductance coil (L) and a switching transistor (TR), connected to the input (E1) of the circuit (10); a logic level detector (DL) having a optocoupler; and a clock circuit (H) controlling the transistor (TR) by adjusting the frequency or the duty cycle to perform voltage matching with the signals applied to the input (E1), and also the value of the voltage surge generated in logic high state (1) by the inductance coil (L) when switching of the transistor (TR) to the off state takes place.

Abstract: An on-die multiple phase power converter reduces output voltage ripple and reduces input current ripple while allowing for higher input voltage and reduced input current to a circuit board. The on-die multiple phase power converter also allows for more than one supply voltage on a die. The converter includes a plurality of single phase switching blocks and a clock signal phase generator. The single phase switching blocks receive phase-shifted clock signals from the clock signal phase generator and provide an output voltage. The output currents of the single phase switching blocks may combine to form a single output to provide current to one or more functional unit blocks on the semiconductor die. One or more or the single phase switching elements may be combined to provide current to one or more functional unit blocks on the semiconductor die.

Abstract: A DC—DC converter has converter circuit portions 11 and 12, transformers Tr1 and Tr2, and rectifier circuit portions 21 and 22. Two sets of converter circuit portions 11 and 12 respectively include two pairs of switching elements Q1 to Q4, and two pairs of switching elements Q5 to Q8 connected in full bridge configuration, series capacitors C1 and C2 are inserted and connected between the converter circuit portions 11 and 12 and the transformers Tr1 and Tr2 respectively. The switching phase of one switching element Q4 or Q8 is shifted by a 1/3n period from the switching phase of the other switching element Q1 or Q5 in the pair of switching elements. The switching phases of corresponding switching elements Q1 and Q5 in the converter circuit portions 11 and 12 are shifted by a 1/2n period from each other.

Abstract: Apparatus for generating a high time-varying AC voltage using low voltage power semiconductors arranged in series bridge circuits, each powered by an independent DC source. At least one bipolar output pulse width modulation bridge circuit and at least a pair of bipolar output square wave generator bridge circuits have their outputs added together and passed through a low pass filter to form a time-varying, typically sinusoidal, AC output waveform. A first square wave generator has an output with a relative magnitude of 6, a second square wave generator has an output with a relative magnitude of 2 and the pulse width modulator has an output with a relative magnitude of 1. Additional square wave generators of relative magnitude 6 may be added to increase the output voltage.

Abstract: In a power generation system including a DC power supply which is connected to a low-voltage distribution system to which a plurality of consumers, each having an earth leakage breaker, are connected and one wire of which is grounded, via a receiving-end earth leakage breaker, and which includes at least a transformerless inverter and an earth floating capacitance, an operational time limit of the receiving-end earth leakage breaker of the power generation system is set to a value larger than an operational time limit of the earth leakage breakers provided in the consumers. The system also includes a ground-direction determination device for determining whether a grounded position is inside or outside the power generation system. Thus, a power generation system in which an unnecessary disconnection of electric power supply does not occur when an accident of external grounding has occurred.

Abstract: The invention relates to a voltage switching device (23) consisting of a power rectifier (26), a boost chopper (34, 35) having at least one storage element (50, 51), a transformer (40), a switching device (59), a control device (4) and a plurality of mains leads (27 to 29), the power rectifier (26) being connected to an energy source (24) by the mains leads (27 to 29) and a consumer (25) with a secondary winding (42) of the transformer (40), a power evaluating device (32) supplied with voltage from the energy source (24) being provided, the output of which is connected to the switching device (59) or to the control device (4).

Abstract: A power conversion system for driving a load is provided. The power conversion system comprises a power transformer having at least one primary winding circuit and at least one secondary winding circuit, the primary winding circuit being electrically connectable to an AC power source. The system further comprises at least one power cell, each of the at least one power cell having a power cell input connected to a respective one of the at least one secondary winding circuit. Each power cell also has a single phase output connectable to the load. An SCR arrangement including a gate drive and at least one SCR is connected to the power cell input and a DC bus. An SCR controller is connected to the SCR arrangement and the power cell input. The power cell also has a PWM output stage having a plurality of PWM switches connected to the DC bus and the single phase output. A local modulation controller is connected to the PWM output stage.

Abstract: A unified power architecture for generating high frequency switched power to a load is provided which includes a number of input branches, each input branch receiving direct current (DC) power from a power source. Each input branch includes a switch device coupled to a storage device for generating input pulses, and a transformer including a primary winding set receiving the input pulses. An output section is provided which includes a plurality of windings around a secondary of each transformer of each of the input branches, the output section generating an output pulse including components of each of the input pulses.

Abstract: A device for equal-rated parallel operation of at least two inductively coupled inverters without additional synchronisation and/or communication lines is described. Each inverter is provided respectively with a control circuit which is intended to control its output voltage, to which control circuit a reference voltage (uref) is supplied as desired voltage, the frequency (f) of which is derived from the active power (P) taking into account preselected frequency statics and the amplitude (|u|) of said reference voltage being derived from the reactive power (Q) of the relevant inverter (1, 2) taking into account preselected voltage statics. According to the invention a value for the phase (&phgr;) of the reference voltage (uref) is also derived from the active power (P) taking into account a preselected weighting coefficient (St1′) by which oscillations and build-ups of the active power components can be avoided (FIG. 4).

Abstract: To provide an IC chip for contactless IC card that ensures reliabilities such as data retention of nonvolatile memory and reduces power consumption. Power supply voltages VDD and VSS, which are output from a rectifier circuit, are used as a power supply for driving an analog circuit, digital circuit, and memory control circuit to cause them to operate at low voltages. A booster circuit is provided for generating a power supply voltage VDDM, which is a boost voltage, to drive a memory circuit. Because the memory circuit can be operated at the same, high voltage and the other circuits can be operated at lower voltages than voltages that would be used in a case where the analog circuit, digital circuit, memory control circuit and memory circuit are driven by a common power supply, power consumption can be reduced.

Abstract: Briefly, in accordance with one embodiment of the invention, a circuit includes: a DC-to-DC converter. The DC-to-DC converter includes a plurality of ripple regulator DC-to-DC converter circuits. The plurality of circuits are coupled so that the output signals produced by each of the ripple regulator DC-to-DC converter circuits is out of phase with respect to the other of the ripple regulator DC-to-DC converter circuits.

Abstract: Power conversion units using pulse width modulation for elimination of harmonics of specific orders are connected in parallel with an ac power system so that the power conversion units supply voltages of mutually different waveforms to the ac power system.

Abstract: A driving circuit of a DC motor includes a control circuit for providing a control signal, and a motor drive circuit commanded by the control circuit for providing respective command signals for the switches of an output power stage connected to the DC motor. The output power stage is connected to a power supply line and drives the windings of the DC motor. The driving circuit prevents generation of voltage surges having a significant magnitude on the power supply line because the driving circuit has logic circuits for preventing any substantial inversion in the direction of current flow in the supply lines when the DC motor operates as a current generator.

Abstract: A switching amplifier (15) includes a power stage (18) and a digital correction circuit (16). The digital correction circuit (16) is for correcting nonlinearity and power supply noise introduced into a digital signal during power stage amplification. The digital correction circuit (16) receives a digital pulse modulated input signal from a processor (14) and an amplified pulse modulated output signal from the power stage (18), and performs a discrete-time pulse edge correction on the digital pulse modulated input signal to provide a corrected digital pulse modulated signal. The corrected digital pulse modulated signal is used as an input for the power stage (18).

Abstract: A parallel operation-type uninterruptible power system capable of preventing one of uninterruptible power systems from being extremely increased in load sharing ratio without having to operate each uninterruptible power system while watching operation of the remaining uninterruptible power systems. The uninterruptible power systems each are constituted by an inverter circuit and an inverter circuit control device. The inverter circuit control device includes a PWM control signal generating means. The PWM control signal generating means generates a PWM control signal so as to gradually reduce an output voltage of the inverter circuit as supply active power increases and until a judging means judges that the supply active power has reached a predetermined level and so as to reduce the output voltage at a reduction ratio increased as compared with before to keep it from falling into an overload condition when the judging means judges that the supply active power has reached the predetermined level.

Abstract: A controller for motor/generators is proposed which allows reductions in ripple current generated by an inverter driving a power-generating motor/generator and a vehicle-driving motor/generator. The control device for motor/generators has a first inverter which supplies a control current to a first motor/generator used mainly as an electrical motor, a second inverter which supplies a control current to a second motor/generator used mainly as a generator, a first PWM signal generating circuit which drives the switching elements of the first inverter based on a first carrier signal, a second PWM signal generating circuit which drives the switching elements of the second inverter based on a second carrier signal which has the same period of the first carrier signal.

Abstract: An electrical power supply apparatus, especially for a motor vehicle electrical system, comprising at least two power supply sources (1, 2) which are both connected between ground and a supply line, and each of which comprises at least one induced current winding and a bridge of rectifier elements (P1, P2), characterised in that one of the two said sources comprises an auxiliary bridge of rectifier elements of positive type (Paux1), the other one comprising an auxiliary bridge of rectifier elements of negative type (Paux2), with means (I; Dc1, Dc2, Dc3; Id), connected to each of the said two bridges and being adapted to be controlled for the purpose of:

Abstract: A unified power architecture for generating high frequency switched power to a load is provided which includes a number of input branches, each input branch receiving direct current (DC) power from a power source. Each input branch includes a switch device coupled to a storage device for generating input pulses, a transformer including a primary winding set receiving the input pulses, and a reset section generating a reset current for setting a core of the transformer. An output section is provided which includes a plurality of windings around a secondary of each transformer of each of the input branches, the output section generating an output pulse including components of each of the input pulses.

Abstract: The present invention is a system and method for a direct conversion programmable power source controller. The invention uses a sampling rate optimized for a transformer used to isolate or to step up or step down the power. The power is sampled at the source frequency and that sampling is phase-angle modulated according to a modulating signal at a frequency representing the sum of the frequencies of the power source and the desired output. After passing the power through the transformer, the invention then again chops that power to produce a multiplication of the power sinusoid with the modulation sinusoid. The output is filtered to integrate the waveform and fed to a load in delta. Between any two terminals of the delta connection, the output voltage presents as a well-formed sinusoid of controlled amplitude and frequency.

Abstract: An electric power system comprises a plurality of capacitors connected in series, a plurality of DC-AC conversion circuits converting each DC voltage of the plurality of capacitor to an AC signal that an AC component equivalent to the inter-terminal DC voltage of each of the capacitors is superimposed on the respective DC voltages and a plurality of condenser couplers break the respective DC voltages and output the AC components respectively, and a processing circuit detecting the inter-terminal DC voltage of the corresponding capacitor from the AC component.

Abstract: Disclosed is an electronic circuit for the bidirectional conversion of a high input voltage to a direct-current output voltage with indirect coupling, more specifically such a circuit for use in a power supply system for rail vehicles, that is provided with a primary converter, one single common transformer and a secondary converter. The primary converter includes at least three primary converter sections connected in series, the output lines of which are each connected to a respective one of the transformer primary windings.

Abstract: The invention relates to a voltage converter for two independent loads (L1, L2) with a bridge circuit (S1, S2, Sa, Sb and S3, S4, Sa, Sb) for a first (L1) and a second (L2) load, respectively, for converting a DC voltage (U45) jointly applied to the bridge circuits (S1, S2, Sa, Sb and S3, S4, Sa, Sb) into an AC voltage (U68, U98) assigned to the respective load (L1, L2),

Abstract: A power controller provides a distributed generation power networking system in which bi-directional power converters are used with a common DC bus for permitting compatibility between various energy components. Each power converter operates essentially as a customized bi-directional switching converter configured, under the control of the power controller, to provide an interface for a specific energy component to the DC bus. The power controller controls the way in which each energy component, at any moment, will sink or source power, and the manner in which the DC bus is regulated. In this way, various energy components can be used to supply, store and/or use power in an efficient manner. The various energy components include energy sources, loads, storage devices and combinations thereof.

Abstract: This invention is an improvement to a multi-level, multi-phase power supply. Typically, in such power supplies, each of the phases has one or more power cells providing a pulse width modulated output. In such a configuration, when the transition of the pulse width modulated outputs of corresponding power cells in different phases occurs simultaneously, a double step in voltage is observed on the output of the power cell. This invention is an improvement over the prior art wherein the transitions of the outputs of the power cells are controlled to avoid simultaneous transitions.

Abstract: A high-voltage DC/DC converter is described. The high-voltage DC/DC converter contains a number of primary-side converter modules and at least one secondary-side converter module. The DC connections of the primary-side converter modules are connected in series between the connections of a high-voltage DC distribution network. The DC connections of the secondary-side converter modules are connected in parallel between the connections of a further DC network. Each of the primary-side converter modules contains a primary-side converter bridge, a primary-side capacitor, a primary-side series resonant capacitor, a transformer and a secondary-side series resonant capacitor. The secondary-side converter module contains a secondary-side converter bridge and a secondary-side capacitor.

Abstract: An electronic equipment for onboard process control includes a first detection stage with a plurality input circuits, comprising each a first transformer having a primary coil connected to the corresponding input via a first hashing transistor, and a secondary coil connected to a diode rectifier circuit. A first clock sends control signals to the first hashing transistor. Adjusting means cooperate with the first clock for adjusting the frequency of the control signals or the cyclic ratio for adapting the voltage of said input circuit. A logic level detector is inserted in the secondary circuit of the first transformer, and is electrically connected to an acquisition circuit. A second recovery stage is connected to a battery supplying the equipment for restoring the energy drained by the input circuits of the first detection stage.

Abstract: Presented is a modular uninterruptible power supply system utilizing common power modules, and providing redundant coordinated control thereof. The system and method of the instant invention provides identical control logic within each of the individual power modules, thus dispensing with the requirement for a separate control module to control and coordinate the operating modes and parameters of the UPS system. A system is presented whereby a virtual master is established through an arbitration scheme at initialization of the UPS system. The master then assigns a virtual vice master to provide the redundant back up control should the virtual master no longer be able to perform its functions. Nearly simultaneous control of operational mode and state change functions is accomplished through a coordinated communications system including a high-speed communications bus and digital control logic lines.

Abstract: A pulse width modulation circuit (10) has a first set of windings with a first inverter circuit coupled thereto and a second set of windings having a second inverter circuit coupled thereto. A pulse width modulation controller pulse width modulates the first inverter circuit and the second inverter circuit so that the first inverter circuit has a predetermined phase shift therebetween to reduce input ripple.

Abstract: A power supply device for an electromotive railcar, including a series circuit composed of a plurality of first capacitors, connected to receive a first DC voltage from an electric power line; a plurality of DC/AC/DC converters. Each of the DC/AC/DC converters including an inverter bridge with an input thereof connected in parallel to one of the first capacitors and having a plurality of power transistors, an insulating transformer with a high carrier frequency and having a primary winding connected to an output of the inverter bridge, and a rectifier circuit connected to a secondary winding of the insulating transformer to output a DC voltage.

Abstract: For independent load sharing of current harmonics between parallel inverter units (1a, 1b, 1c) in an AC power system without intra-unit control signal communication, where each inverter unit is connected to a common load (8) through a separate impedance (7a, 7b , 7c), amplitude and phase of a selected current harmonic is determined for each unit by processing of a current value M measured in a power output line (51a, 51b, 51c) from the unit before the separate impedance and is compared with amplitude and phase of a feed-back voltage or current (V) from the power output line to produce an error signal, which is used for determination of a control signal component for the selected harmonic for incorporation into a control signal input to control means for controlling the content of said harmonic in the voltage and/or current supplied by the inverter unit (1a, 1b, 1c) to the common load (8).

Abstract: Power conversion units using pulse width modulation for elimination of harmonics of specific orders are connected in parallel with an ac power system so that the power conversion units supply voltages of mutually different waveforms to the ac power system.

Abstract: A method and apparatus for conducting regenerative braking for a motor load is disclosed wherein the load is driven by a plurality of power cells on each phase-line to the load, the plurality of power inverters comprising at least one single phase power inverter and at least one 3-phase inverter wherein the 3-phase inverter is connected across 3-phase lines. First, it is detected when the motor load is regenerating a motor load voltage. Then, each single phase inverter in each phase line is shorted out after detecting the motor load regeneration. The motor load voltage is then supplied to the 3-phase inverter. Finally, the load motor voltage is lowered by conducting regenerative braking through the 3-phase inverter.

Abstract: An inverter arrangement which comprises two inverter units which comprise an intermediate voltage circuit and phase-specific switch components. The inverter arrangement also comprises phase-specific one-phase autotransformers, the first poles of which are connected to the phase-specific outputs of the first inverter unit and the second poles to the phase-specific outputs of the second inverter unit, and thus the output voltage of the inverter is obtained from the third poles of the autotransformers.

Abstract: A power supply comprises a first power converter having respective input and output terminals, and a second power converter having respective input and output terminals. The output terminals of the first and second power converters are connected in series to provide a combined output voltage. A switch is connected to the input terminals of the first and second power converters. The switch has a first state by which the input terminals of the first and second power converters are connected in series, and a second state by which the input terminals of the first and second power converters are connected in parallel. A pulse width modulator (PWM) unit provides a drive signal to regulate current provided to the first and second power converters. A balance winding is coupled between the first and second power converters in order to share power between these two converters when their inputs are connected in series.

Abstract: A redundant AC power system has at least two AC power sources, each of which includes an AC voltage supply connected to the primary winding of a source transformer. The source transformers have secondary windings with two outputs and a grounded center tap. There is a steering diode in series with each output. The redundant AC power sources supply power to one or more load systems. The output sides of the respective diodes for the two AC power sources are connected to the respective inputs of the primary winding of a load transformer with a pair of load-transformer primary inputs and a load-transformer primary center tap connectable to ground. A switch controllably connects the center tap of the load transformer to ground. A load is connected to the secondary winding of the load transformer.

Abstract: A parallel operation-type uninterruptible power system capable of preventing one of uninterruptible power systems from being extremely increased in load sharing ratio without having to operate each uninterruptible power system while watching operation of the remaining uninterruptible power systems. The uninterruptible power systems each are constituted by an inverter circuit and an inverter circuit control device. The inverter circuit control device includes a PWM control signal generating means. The PWM control signal generating means generates a PWM control signal so as to gradually reduce an output voltage of the inverter circuit as supply active power increases and until a judging means judges that the supply active power has reached a predetermined level and so as to reduce the output voltage at a reduction ratio increased as compared with before to keep it from falling into an overload condition when the judging means judges that the supply active power has reached the predetermined level.

Abstract: An inverter parallel operation system comprising a first inverter adapted to control the output frequency thereof by controlling a control element comprising the inverter, and a second inverter and subsequent inverters adapted to control the output frequency thereof by controlling control elements comprising the inverters; power being fed to a common load after a choke coil provided on the output-side end of a first filter provided on the output side of the first inverter has been connected to a choke coil provided on the output-side end of the second filter on the output side of the second and subsequent inverters; the improvement comprising controlling effective powers output by the first inverter, and the second and subsequent inverters by detecting the effective powers output by both the inverters and controlling any one or both of the output frequencies predetermined in accordance with the effective powers.

Abstract: A control system to control at least one of the thyristor converters (1) or (2) of an ac system (7,8) or (9,10) connected by busbars (5,6) and transformers (3,4) to the converters (1,2) which have their dc sides connected by a dc link, for example inductor (11). Each thyristor converter receives firing pulses from a firing control (12) or (13), including a firing angle control (18) and a summing junction (16) receiving a control current signal input (17) and a current signal (14) which is a function of converter operation. An electrical power measurement is made of one of the ac systems, for example the ac system (7,8,5) and in accordance with that power measurement a signal which is a function thereof is produced as an output (19) from an integral two-axis ac servo control having demodulator, integrator and modulator means receiving the power measurement signal as input. Signal (19) is a function of the cross-modulation noise component caused by interaction of electrical noise from the two converters.

Abstract: For independent load sharing of current harmonics between parallel inverter units (1a, 1b, 1c) in an AC power system without intra-unit control signal communication, where each inverter unit is connected to a common load (8) through a separate impedance (7a, 7b, 7c), amplitude and phase of a selected current harmonic is determined for each unit by processing of a current value M measured in a power output line (51a, 51b, 51c) from the unit before the separate impedance and is compared with amplitude and phase of a feed-back voltage or current (V) from the power output line to produce an error signal, which is used for determination of a control signal component for the selected harmonic for incorporation into a control signal input to control means for controlling the content of said harmonic in the voltage and/or current supplied by the inverter unit (1a, 1b, 1c) to the common load (8).

Abstract: A generalized method for balancing paralleled power converters is disclosed wherein (N) power converters, generally voltage amplifiers, are parallel and have current sensors positioned so as to form a differencing equation for the circulating current, and use that difference current as feedback to the paralleled power converters to force the circulating current to zero. The current sensors are current transforming transducers, where (N−1) transducers are included and where the feedback from the (N−1) transducers is distributed to summing amplifiers, which according to their gain distribution, balances the power converters. The system also includes passive magnetic devices to facilitate current sharing, where the devices are generally inductors which are designed to store no magnetic energy when under balanced excitation.

Abstract: The present invention relates to a power supply having a plurality of converters which is capable of easily setting a load share of each converter and simplifying the construction of the circuit, thereby reducing the cost. A DC source circuit having such a power supply includes a plurality of converters (each having a transformer, switches for interrupting a DC input and supplying the same to a first side of the transformer and a rectifier circuit for rectifying a voltage outputted from a second side of the transformer), an output circuit which cascade-connects each output voltage of the plurality of converters and thereby obtains a composite output voltage Vout, and a common control circuit for feedback-controlling the plurality of switches as a function of the composite output voltage, e.g., according to the difference between the composite output voltage and the reference voltage. A load of each converter is shared according to each set output voltage.

Abstract: The switching converters of a power supply device are adapted to equally share the power output of the device. The power supply device 1 comprises a plurality of resonance type switching converters 4, 5 connected in parallel relative to a load, frequency control circuits 6, 7 for controlling respectively the switching frequencies of the switching converters 4, 5, a feedback circuit 8 for feeding back the voltage applied to the load and a resonance current balance circuit 9 for detecting the wave heights of the resonance currents flowing respectively through the switching converters 4, 5 and comparing them. The frequency control circuits 6, 7 control the switching frequencies so as to make the voltage applied to the load show a predetermined voltage value and also make the wave heights of the resonance currents equal to each other.