Abstract: The present invention provides a power-supply apparatus with a current-sharing circuit and a current-sharing method thereof. The power supply with a current-sharing function uses a bus terminal as a current-sharing control interface. A power circuit provides an output voltage and an output current to an output terminal; and it generates a current-sense signal according to the output current. A feedback control circuit controls the power circuit according to the output of the power-supply apparatus. A current-sharing unit generates and outputs a bus signal to the bus terminal according to the current-sense signal. The current-sharing unit also generates and outputs a reference signal according to a reference voltage, the bus signal, and the output current so as to regulate the output of the power-supply apparatus through the feedback control circuit. The bus communication circuit monitors and/or controls the power-supply apparatus.

Abstract: The present invention includes multiple power converters for driving one or more loads via an input power source, AC or DC. A first switching power converter has first one or more windings coupled to an input power source, and a second switching power converter having second one or more windings coupled to one or more loads. A magnetic device comprising a single integrated magnetic core couples the first one or more windings to the second one or more windings for reducing switching loss.

Abstract: A support may receive one or more power electronic circuits. The support may aid in removing heat from the circuits through fluid circulating through the support. The support, in conjunction with other packaging features may form a shield from both external EMI/RFI and from interference generated by operation of the power electronic circuits. Features may be provided to permit and enhance connection of the circuitry to external circuitry, such as improved terminal configurations. Modular units may be assembled that may be coupled to electronic circuitry via plug-in arrangements or through interface with a backplane or similar mounting and interconnecting structures.

Abstract: A method and apparatus for adaptively configuring an array of voltage transformation modules is disclosed. The aggregate voltage transformation ratio of the adaptive array is adjusted to digitally regulate the output voltage for a wide range of input voltages. An integrated adaptive array having a plurality of input cells, a plurality of output cells, or a plurality of both is also disclosed. The input and output cells may be adaptively configured to provide an adjustable transformer turns ratio for the adaptive array or in the case of an integrated VTM, an adjustable voltage transformation ratio for the integrated VTM. A controller is used to configure the cells and provide digital regulation of the output. A converter having input cells configured as a complementary pair, which are switched out of phase, reduces common mode current and noise. Series connected input cells are used for reducing primary switch voltage ratings in a converter and enabling increased operating frequency or efficiency.

Abstract: A disk array system including at least one channel control portion, at least one disk control portion, a cache memory, a cache switch, a shared memory, a power unit, and a casing for storing the channel control portion, the disk control portion, the cache memory, the cache switch, the shared memory and the power unit, wherein: each of the channel control portion, the disk control portion, the cache memory, the cache switch and the shared memory includes a control board having a plurality of electronic circuits different in operating voltage, and a voltage converter for converting a single input voltage into voltages for operating the electronic circuits respectively; and the power unit supplies a voltage to the voltage converter provided in each of the channel control portion, the disk control portion, the cache memory, the cache switch and the shared memory.

Abstract: Rectifying elements are connected in parallel with switching elements 4-1 through 4-4 in a switching section 4 for the lower voltage side and rectifying elements are connected in parallel with switching elements 5-1 through 5-4 in a switching section 5 for the higher voltage side. An LC resonant circuit 6 is provided between the winding wire 3-2 for the high-voltage side in the transformer 3 and the switching section 5 for the higher voltage side; currents which flows on the primary side and the secondary side is changed into a sinusoidal one; and switching is executed in the vicinity of the zero crossing points of the currents.

Abstract: A power supply device and an operating method thereof are provided. The power supply device includes a main converter and an auxiliary converter. The main converter includes a power factor corrector (PFC), a first capacitor that connects in parallel with the PFC and a DC/DC converter that connects in parallel with the first capacitor. The auxiliary converter is connected in parallel to the main converter. When the power supply device operates in a normal mode, the main converter and the auxiliary converter together provide a first output to an output load. When the power supply device is in a standby mode, the DC/DC converter is turned off so that only the auxiliary converter provides a second output to the output load. Meanwhile, the PFC is in operation to maintain the voltage of the first capacitor in order to meet the demand of the output dynamic response of the main converter.

Abstract: A current distribution circuit for parallel power supplies is provided. The parallel power supplies include at least a first power supply and a second power supply, and the current distribution circuit includes a voltage amplifier, a power converting unit, a detecting unit, an equivalent diode, an adjustable amplifier, an adder and an active droop unit. The operating voltage reference of the active droop unit is linearly adjusted for reducing an error resulting from the first power supply and the second power supply while the load is less than a pre-determined value.

Abstract: A high power isolated switching converter is provided, comprising a first power (11) stage and second power (12) stage connected in cascade such that the second power (12) stage is by-passed during part of a start-up mode.

Abstract: A method and apparatus for adaptively configuring an array of voltage transformation modules is disclosed. The aggregate voltage transformation ratio of the adaptive array is adjusted to digitally regulate the output voltage for a wide range of input voltages. An integrated adaptive array having a plurality of input cells, a plurality of output cells, or a plurality of both is also disclosed. The input and output cells may be adaptively configured to provide an adjustable transformer turns ratio for the adaptive array or in the case of an integrated VTM, an adjustable voltage transformation ratio for the integrated VTM. A controller is used to configure the cells and provide digital regulation of the output. A converter having input cells configured as a complementary pair, which are switched out of phase, reduces common mode current and noise. Series connected input cells are used for reducing primary switch voltage ratings in a converter and enabling increased operating frequency or efficiency.

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: A series circuit of a first main transistor 4 and a first main diode 6 is connected across a DC input voltage source 1, and a filter capacitor 13 and a series circuit of a second main diode 12 and a second main transistor 8 are connected in parallel with the output load side. A filter reactor 7 is connected between the juncture of the first main transistor 4 and the first main diode 6 in the series circuit and the juncture between the second main diode 12 and the second main transistor 8 in the series circuit. Resonant capacitors 5 and 9 in effect are connected across the collector-emitter path of the first and second main transistors 4 and 8, respectively. In operations other than that with small load current, when the first and second main transistors 4 and 8 are turned off, the collector currents therefrom are caused to flow to the resonant capacitors 5 and 9, respectively, thus obtaining soft switching.

Abstract: A plurality of power supply modules having their outputs coupled in parallel are controlled for load balancing purposes through a direct current bus having filtered pulse width modulation (PWM) signals representative of the power outputs of each of the plurality of power supply modules. A local PWM signal for each of the plurality of power supply modules is filtered to a DC voltage and used to compare with an average power required from each of the plurality of power supply modules.

Abstract: A switching buck regulator circuit includes an n-type high-side switch. The driver of the high-side switch employs a boot voltage (Vcboot) as a power supply. Also, the output current is mirrored to a sense branch. A current sense voltage is generated employing a transistor in the sense branch. The current sense voltage is compared to a reference voltage that is generated employing another transistor having a gate that is coupled to the gate of the sense branch transistor. A diode (Dp) is coupled between the gate of the sense branch transistor and the input voltage (Vin). Another diode (Dc) is coupled between the gate of the sense branch transistor and Vcboot. When the high-side switch is off, the current sense voltage is clamped to substantially Vin?VDp?VTN2. When the high-side switch is on, the gate voltage of the high-side switch is substantially given by Vcboot?VDc.

Abstract: A power supply system, includes a power supplying unit supplying a DC power; a DC/DC converter having a plurality of phase processing units separating the DC power supplied from the power supplying unit into a plurality of phase currents to process the plurality of phase currents, with which the DC/DC converter converts the DC power into individual power supplies in a plurality of different voltages; and a controller sensing phase currents of the phase processing units and controlling the power supplying unit so as to interrupt a power supply from the power supplying unit where a voltage corresponding to any one of the phase currents is higher than a predetermined reference voltage.

Abstract: There is provided a power source apparatus that includes a master circuit and a slave circuit provided in parallel and outputs an electric current that adds an electric current output from the master circuit and an electric current output from the slave circuit as a power-supply current. The master circuit includes: a main circuit side output section operable to output an electric current depending on a given voltage; a main circuit side reference power source operable to generate a reference voltage corresponding to a power-supply voltage that the power source apparatus is to output; and a main circuit side control section operable to supply the voltage corresponding to the reference voltage to the main circuit side output section in order to control the current output from the main circuit side output section.

Abstract: A multi-output DC-DC converter comprising a plurality of converters configured so that an inductor 2 and a main switch 31 are used in common, wherein a first output voltage Vo1 is output from a circuit comprising a diode 41 and a first output capacitor 51, and a second output voltage Vo2 is output from a circuit comprising an auxiliary switch 32, a diode 42 and a second output capacitor 52. The control circuit 80 of the multi-output DC-DC converter has an output detection circuit 81, an oscillation circuit 82, a PWM circuit 83, a frequency divider circuit 84 and a drive circuit 85, and controls a plurality of outputs at high efficiency and reliability.

Abstract: The output voltage of a dc—dc transformer having a ratio of approximately m/n, and which is powered from a main power supply having a remote sense input, can be stabilized by feeding the output of the dc—dc transformer to the remote sense input of the main power supply through an amplifier having a voltage gain of m/n.

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: An A/D converter with adjustable internal connection and a method for operating the same are provided. The A/D converter comprises: a plurality of piezo-transforming devices for detecting an input voltage from the alternating current source and adjusting an connection of input terminals of the plurality of piezo-transforming devices based on the input voltage to obtain an input/output voltage ratio of the plurality of piezo-transforming devices inversely proportional to the input voltage.

Abstract: A control system and method for simultaneously regulating the operation of a plurality of different types of switching power converters. The system utilizes in regulating the power converters sampled data and nonlinear feedback control loops.

Abstract: A circuit arrangement supplies voltage to a load during normal operation and in a standby mode. The arrangement has the following features: input terminals for application of a supply voltage, a first converter unit having a power factor converter and a flyback converter connected downstream from it, with the power factor converter producing an intermediate voltage across a capacitive energy storage element during normal operation, and a converter unit, which is coupled to the input terminals and produces an output voltage across the first output terminals when in the standby mode, and which has second output terminals which are coupled to the capacitive energy storage element in the PFC.

Abstract: A PWM system that minimizes output ripple of a multiphase DC-DC converter which converts N input voltages including at least one dissimilar input voltage. The PWM system includes PWM waveform logic that generates N PWM signals including a PWM signal for each of the N input voltages, and PWM control logic that optimizes relative phases of the N PWM signals based on voltage levels of the N input voltages. Various circuits and/or methods are contemplated for optimizing phase, including, for example, centering pulses for each PWM cycle, distributing pulses based on predetermined optimal phase angles, determining input voltage levels and selecting predetermined optimal phase angles, generating phase signals employing predetermined phase angles, measuring input voltages and calculating optimal phase angles, and using PLL logic or the like to measure and equalize off-times between PWM pulses.

Abstract: In another embodiment, the present invention is directed to a power distribution system for electronic equipment, comprising a voltage bus; a plurality of power supplies coupled in parallel to the voltage bus; a plurality of diodes wherein each of the diodes is disposed between a power supply and the voltage bus to isolate the voltage bus from a low power supply voltage; a plurality of sense lines, wherein each of the sense lines is coupled to one of the plurality of power supplies; and a plurality of resistive elements, wherein each of the resistive elements is coupled to the voltage bus and to a respective sense line of the plurality of sense lines, wherein the plurality of resistive elements maintain, when a minimal load is applied to the voltage bus, the sense lines at a voltage sufficiently lower than a voltage of the voltage bus to cause the plurality of power supplies to prevent the plurality of diodes from being reversed-biased.

Abstract: A selector sets respective phases of pulse driving signals in reverse when a proportion signal or integration signal does not exceed a threshold. Shifting the respective phases of the pulse driving signals from each other lowers the ripple voltage. When the load current increases drastically, the output voltage Vo tends to decrease remarkably because of the shortage of capacity in the power supply. In this case, when the proportion signal or integration signal exceeds its corresponding threshold, a phase control unit causes the pulse driving signals to synchronize their phases, i.e., the selector supplies the same ramp wave to the comparators, so that respective output voltages supplied from the DC voltage converter circuits attain the same phase, thereby restraining the output voltage supplied to the load from decreasing remarkably.

Abstract: In prior arts, additional pulse-width modulators and more costs are needed for increasing the current output. The invention provides a synchronized parallel running power converter. The power converter includes multiple power converters controlled by single-phase or double-phase pulse-width modulators. Each power converter includes a first pulse input port, a second pulse input port and a current output port. Each first pulse input ports are coupled, and each second pulse input ports are coupled also, so that each power converter is controlled by the same pulse signal and provide a same output current to be added as several times of current output.

Abstract: A power conversion system includes a first converter having a DC side and an AC side and a second converter having a DC side and an AC side. The DC sides of the converters are connected in series with a battery connected in parallel across the DC side of the first converter. The AC sides of the converters are connected in parallel across an AC voltage grid. A DC generating power source is coupled across the DC sides of both converters. The first converter is bi-directional with the second converter being either an inverter providing DC to AC conversion or alternately a bi-directional inverter.

Abstract: A circuit configuration in which a pair of conversion circuit parts for converting a power source voltage of a DC power source into an AC by two pairs of switching elements made of a full bridge configuration and a pair of transformers is used as inverter units. The n groups of the inverter units are provided with respect to the DC power source, and a secondary side of one transformer of each of the inverter units are connected in series among the n groups and also a secondary side of the other transformer are connected in series among the n groups.

Abstract: A DC-to-DC converter comprises a first power module, at least a second power module coupled to the first power module, and a protection circuit coupled to the first and second power modules. The protection circuit causes a system power good signal to be at a state indicative of a power problem when the protection circuit detects that a switching node of one of the power modules has ceased switching.

Abstract: In a DC/DC converter having a plurality of DC/DC converters, to prevent faults in the circuit and the circuit elements constituting it even when the balance of current limiting operation among the individual DC/DC converters is disturbed due to individual and temperature-related variations in the characteristics of the circuit elements, the output currents of the individual DC/DC converters are detected and added together, and are limited individually so that their sum does not exceed a predetermined level of current.

Abstract: A static inverter for a battery of elementary, current sources or cells electrically in series and a number N of intermediate voltage taps along the chain of elementary DC current sources, wherein the number of elementary cells comprised between an intermediate tap and another intermediate tap adjacent to it or an end terminal of said chain is proportionate to the amplitude in the respective phase interval of a number N of discretization phases of the waveform of the AC voltage to be output in a quadrant; is implemented by arranging for: a number N of power switches each connecting a respective intermediate tap and a first end terminal of a first polarity of said chain of elementary cells in series to a common circuit node of said first polarity; an output bridge stage constituted by at least four power switches controlled in pairs for switching the current paths through the bridge stage, having a first pair of nodes coupled to said common circuit node of said first plurality and to the other end terminal of

Abstract: A switching power supply wherein output voltage error detecting means detects the output voltage of DC-DC converters and generates an error signal, input voltage deviation detecting means detects voltages corresponding to the input voltages of the DC-DC converters to generate a deviation signal, and control means receives the error signal of the output voltage error detecting means and the deviation signal of the input voltage deviation detecting means and controls the driving of the DC-DC converters.

Abstract: A power supply in an embodiment of the invention includes a plurality of dc—dc switching power converters, each of which has its input isolated from its output. The power converters are arranged with their respective inputs being series connected and their respective outputs being parallel connected in an embodiment of the invention. In another embodiment of the inputs are parallel connected and the outputs series connected. Each power converter includes an input filter in each of said dc—dc switching power converters and an output filter. Each power converter includes a sensorless current mode control circuit controlling its switching duty ratio.

Abstract: A power supply comprises at least one power switch adapted to convey power between input and output terminals of the power supply, and a digital controller adapted to control operation of the at least one power switch responsive to an output measurement of the power supply. The digital controller comprises an analog-to-digital converter providing a digital error signal representing a voltage difference between the output measurement and a reference value, a digital filter providing a digital control output based on a sum of previous error signals and previous control outputs, an error controller adapted to modify operation of the digital filter upon an error condition, and a digital pulse width modulator providing a control signal to the power switch having a pulse width corresponding to the digital control output.

Abstract: A power supply for a capacitive-resistive load includes plural paralleled phase correcting modules together with current sharing controllers for tending to equalize their currents. Each module is provided with a diode, poled to prevent forward current from flowing in the return current path, for aiding in equalizing module currents. Surge currents are reduced by a single saturable reactor coupled to the combined outputs of current sharing controllers, thereby avoiding the need for soft-start in each controller. A precharging path extends from a source of pulsating direct voltage to the load, for precharging the load capacitance at turn-on.

Abstract: A control system and method for simultaneously regulating the operation of a plurality of different types of switching power converters. The system utilizes in regulating the power converters sampled data and nonlinear feedback control loops.

Abstract: In a switching power supply device, the operating voltage is supplied to the power-factor improvement control circuit when the switching power supply device is operating under normal operating load. Thereby, the booster chopper circuit is controlled by the power-factor improvement control circuit so as to improve the power factor of the device. By contrast, during the non-oscillation period while the switching control circuit is in the intermittent oscillation mode when the power consumption is small, the voltage induced in the auxiliary winding drops. Accordingly, the voltage of the auxiliary power supply also drops. Furthermore, when the driving voltage to be supplied to the power-factor improvement control circuit is reduced below the operating voltage thereof by the voltage reduction circuit, the power-factor improvement control circuit stops functioning, thereby reducing power consumption accordingly.

Abstract: A low-complexity, high accuracy model of a CPU power distribution system has been developed. The model includes models of multiple power converters that input to a board model. The board model then inputs to a package model. Finally, the package model inputs to a chip model. The model provides a high degree of accuracy with an acceptable simulation time.

Abstract: A dual input DC—DC power converter integrating high/low voltages can simultaneously or individually transfer the power from two input power sources respectively having voltages higher than and lower than an output voltage to a load end. If one power source is failed, the other power source can still transfer power normally. Moreover, if an appropriate control circuit is matched, the currents and powers of the two input DC power sources can be accurately controlled to accomplish tracking operations of the maximum power of each power source. The power conversion system can be exactly simplified to accomplish the effects of enhanced efficiency and lowered cost and also have the advantage of simultaneous transmission of power from two voltage sources to the load end.

Abstract: A DC/DC converter and a series regulator are connected in parallel between an input terminal and an output terminal. At the time of a heavy load, the DC/DC converter is operated. Although the DC/DC converter has a large current consumption of its own, it has a high power conversion efficiency. Accordingly, since a load current increases at the time of a heavy load, it is effective to use the DC/DC converter whose power conversion efficiency is high, and its current consumption can be neglected since the load current is large. On the other hand, at the time of a light load, the series regulator is operated. Although the series regulator has a small current consumption of its own, it has a low power conversion efficiency. Accordingly, at the time of a light load, even when the series regulator is used, its low power conversion efficiency can be neglected because its current consumption is small.

Abstract: A plurality of single-phase synchronizing converter automatically synchronize on a peer-to-peer basis. Each synchronizing converter is configured as a DC-to-DC converter. The synchronizing converters operate in parallel as a multi-phase converter. A common bus between the synchronizing converters includes a sync line and a common phase control line. Proper phasing automatically occurs when power is applied, and the phasing changes automatically as converters are added or removed. When the system powers up, the converters arbitrate for phase position. The phasing positions are random, but the phasing is relatively symmetrical regardless of the number of phases. In one embodiment, a hot-swappable converter module can be plugged into any location of a parallel multiphase bus to produce a common output voltage. When an additional module is plugged in, the converters readjust their phases to maintain phase symmetry. In one embodiment, each module shares a substantially equal portion of the output load.

Abstract: A managing system manages a plurality of VRMs associated with a plurality of microprocessors and connected in parallel together between first and second voltage references, the VRMs having output terminals connected together and arranged to communicate over a common bus. The managing system includes an error amplifier being input an output voltage signal from the VRM plurality, a reference voltage, and a droop voltage produced through an equivalent droop resistor receiving an output current signal from the VRM plurality and being connected to the common bus. The error amplifier effects a comparison of the input signals to generate a control voltage signal to the VRM plurality. Advantageously, the managing system comprises a controller connected to the equivalent droop resistor.

Abstract: An active sensing and switching device for use in controlling current to a load, comprising a controller means (U1) for disconnecting the load from a power source by providing a switch-open control signal based on a signal indicating a sensed value of electrical current to the load, characterized in that the controller means (U1) determines a nominal value for the electrical current to the load based on monitoring the signal indicating the sensed value of electrical current to the load. A load control system is also provided, including a single ASSD adapted to receive signals indicating sensed values of electrical current to a plurality of respective loads, and further comprising a plurality of load control modules adapted so as to be disposed in proximity to respective loads or a main power line, wherein the load control modules provide respective signals indicating sensed values of electrical currents to the respective loads.

Abstract: A multiphase DC-DC converter architecture, in which respectively different channels have different operational performance parameters. These different parameters are selected so as to enable the converter to achieve an extended range of high efficiency. The converter contains a combination of one or more fast response time-based converter channels, and one or more highly efficient converter channels in respectively different phases thereof and combines the outputs of all the channels. The efficiency of the asymmetric multiphase converter is higher at light loads (up to approximately 12 amps), enabling it to offer longer battery life in applications that spend most of their operating time in the leakage mode, as noted above.

Abstract: A method of communicating over a power line is disclosed, the method comprising the step of modulating a current component of an AC power signal present on the power line. Also disclosed is a communications protocol for communication between a monitoring unit and an appliance, the protocol having two modes of operation, the first mode being an on-line single direction protocol for communications from the appliance to the monitoring unit via modulation of a current component of an AC power signal between the monitoring unit and the appliance, and the second mode being an off-line protocol for communications at least from the monitoring unit to the appliance, the second mode being operable only when the power signal is not present between the monitoring unit and the appliance.

Abstract: A Factorized Power Architecture (“FPA”) method and apparatus includes a front end power regulator (“PRM) which provides one or more controlled DC bus voltages which are distributed through the system and converted to the desired load voltages using one or more DC voltage transformation modules (“VTMs”) at the point of load. VTMs convert the DC bus voltage to the DC voltage required by the load using a fixed transformation ratio K=Vout/Vin and with a low output resistance. VTMs exhibit high power density, efficiency and, owing to their inherent simplicity and component utilization, reliability. VTMs may be paralleled and share power without dedicated protocol and control interfaces, supporting scalability and fault tolerance. Feedback may be provided from a feedback controller at the point of load to the front end or to upstream, on-board power regulator modules (“PRMs”) to achieve precise regulation.

Abstract: The present invention provides a current distribution circuit for parallel power supplies, wherein the power supplies includes at least a first power supply and a second power supply. The current distribution circuit includes a voltage amplifier, a power converting unit, a current detecting unit, an equivalent diode, a regulable amplifier, an adding unit and a soft-start circuit.

Abstract: The output voltage of a power converter is controlled by comparing the output voltage to a target output voltage during a first time interval and calculating an inductor current required in a second time interval immediately following the first time interval to increase the output voltage to the target output voltage. A duty cycle of a switch is varied to modify the current in the inductor during the second time interval according to the calculated inductor current. In one embodiment a fixed duty cycle response is provided if the output voltage is less than a predefined maximum and greater than a predefined minimum. In another embodiment the duty cycle of the switch is bounded by a predetermined maximum and minimum value.

Abstract: A controller for a multiphase converter including an error amplifier, a gain resistor, a current sense circuit and a gain adjust amplifier. The error amplifier generates an error signal based on an error voltage developed across a feedback resistance. The current sense circuit converts each of multiple sensed load currents into corresponding proportional voltages. The gain adjust amplifier circuit receives the proportional voltages and operates to apply at least one gain adjust voltage to the gain resistor to develop a gain adjust current that is applied through the feedback resistance to adjust gain. In one embodiment, the proportional voltages are time multiplexed or averaged to provide the gain adjust voltage(s). An IC integrating the multiphase converter need only include a single gain pin for coupling to a gain resistor to set gain for each phase.

Abstract: The invention provides a power supply system and a method for providing a power supply for a machine having a plurality of components. The system comprises a power source and a set of two or more voltage converters connected in parallel and coupled to the power source via a common bus. An electrical supply line is coupled to an output of the set of voltage converters for supplying a required voltage to the components of the machine connected to the electrical supply line.