Abstract: Certain aspects of the present disclosure provide a power supply system. The power supply system generally includes a first voltage regulator and a second voltage regulator, outputs of the first voltage regulator and the second voltage regulator being coupled to an output of the power supply system. The power supply system may also include a current balancer circuit configured to adjust an output current of the first voltage regulator based on determined headrooms of the first voltage regulator and the second voltage regulator.

Abstract: A converter circuit includes a pull up component, a pull down component, and a controller configured to operate the pull up component and the pull down component so as to deliver power to a load. The controller is configured to operate the pull up and pull down components in first and second operational modes, based on an average current delivered to the load. The converter circuit also includes a mode control circuit to generate a mode control signal based in part on a representation of a peak current received at the switch node from the pull up component.

Abstract: An x-ray source for improved electron beam control, a smaller electron beam spot size, and a smaller x-ray spot size with reduced power supply size and weight. A method for improved electron beam control, a smaller electron beam spot size, and a smaller x-ray spot size with reduced power supply size and weight. Grid(s) may be used in an x-ray tube for improved electron beam control, a smaller electron beam spot size, and a smaller x-ray spot size. Control circuitry for the grid(s) can be disposed in electrically insulative potting. Light may be used to provide power and control signals to the control circuitry.

Abstract: A power supply system includes a plurality of DC-DC converters and at least one operating unit. The DC-DC converters are connected in parallel to one another. The at least one operating unit operates the DC-DC converters such that power is supplied through the DC-DC converters to a predetermined power-supplied object. The at least one operating unit includes a voltage controller, a current limiter, and an increasing unit. The voltage controller operates the DC-DC converters such that output voltages thereof are controlled to be respective target voltage. The current limiter limits output currents of the DC-DC converters so that they are limited with respect to a respective specified value. The increasing unit increases a specified value for at least one DC-DC converter of the DC-DC converters, when all of the plurality of DC-DC converters are activated and output current of at least one other DC-DC converter of the DC-DC converters reaches a specified value for the at least one other DC-DC converter.

Abstract: A circuit breaker comprising first and second JFETs, each comprising a gate, drain and source connection, the JFETs sources being operatively connected to each other to form a common-source connection and adapted to be connected to and operating to open an external circuit when the current flowing through the JFETs exceeds a predetermined threshold, the JFETs' gates, and common-source connection being operatively connected to a gate driver circuit which causes the JFETs to turn off when the predetermined threshold is exceeded; whereupon the current flows through the common-source connection into the second gate and into the gate driver circuit which causes the gate driver circuit to turn off the first and second JFETs and open the circuit breaker. Also claimed is a method of sensing an overloaded circuit comprising leading and trailing JFETs in a circuit that open the circuit and prevent current flow when a predetermined threshold is exceeded.

Abstract: A control unit of a system stabilization device uses a fluctuation detection block (60) to determine fluctuation components included in the active component and reactive component currents of a system current and fluctuation components included in the frequency signal and the amplitude signal of a system voltage. The high frequency cut-off of the fluctuation detection block (60) is set to be f1; the low frequency cut-off is set to be f2. The fluctuation detection block (60) is composed of a low-pass filter (61) with a time constant of T1, a low-pass filter (62) with a time constant of T2, a subtracter (63) which outputs the difference, between the output signals of the filter (61) and the filter (62), and a feedback circuit (64) which provides feedback on the output of the subtracter (63) to the filters (61, 62). Thus, stability is ensured without using a current detector.

Abstract: In an uninterruptible power supply apparatus, a common mode current flowing from nodes (N1 to N3) to a line of a ground voltage (GND) through a stray capacitance (41) of a battery (40) is limited by a common mode reactor (34), and the low-level common mode current passing through the common mode reactor (34) is caused to flow to a virtual neutral line (NL) through a common mode capacitor (37). Therefore, the level of noise caused by the common mode current can be reduced.

Abstract: A semiconductor IC device capable of power-sharing includes a first power line configured to be supplied with a first power, a second power line configured to be supplied with a second power, a switching block configured to connect the first power line with the second power line in response to a first control signal, and a power-sharing control block configured to generate the control signal in accordance with a plurality of operation command signals.

Abstract: A method of balancing current supplied by a plurality of regulators coupled to a load includes: measuring an average load current supplied by each regulator; determining an overall average current to be shared by the plurality of regulators; comparing each average load current with the overall average current to be shared by the plurality of regulators; and adjusting an output current of one or more of the plurality of regulators so that the plurality of regulators supply the same current to the load.

Abstract: An apparatus and method for load sharing among N current supplies, where N>1. N current supply paths are coupled to corresponding N independent power sources, respectively. A system load is coupled to the outputs of the N current supply paths to receive N current supplies. There is a common current share bus configured to connect to the N current supply paths to provide a common current share signal, used to indicate the current contribution needed from each of the N current supply paths. In this configuration, each of the N current supply paths adjusts an adjustable voltage drop between its power source and the current supply it provides to the system load in accordance with the common current share signal so that the current supplied from each current supply path is consistent with the common current share signal.

Abstract: Circuits and methods for paralleling voltage regulators are provided. Improved current sharing and regulation characteristics are obtained by coupling control terminals of the voltage regulators together which results in precise output voltages and proportional current production. Distributing current generation among multiple paralleled voltage regulators improves heat dissipation and thereby reduces the likelihood that the current produced by the voltage regulators will be temperature limited.

Abstract: Across current compensation control system includes a cross current detection compensator having an input terminal to which a cross connection line that cross-connects the secondary sides of auxiliary current transformers (CTs) are connected, and an output terminal to which cross current compensation lines that connect the secondary sides of CTs in series are connected, in which the cross current detection compensator supplies a compensation current to the cross current compensation line so as to cancel the current component corresponding to the cross current that appears at the secondary sides of the CTs when detecting the cross current that circulates within a bus bar, a distribution line, and a switch.

Abstract: In master-slave current-tracking load-share systems using switching power supplies, a method and apparatus for preventing current recirculation at light-load and no-load operational conditions. The slave power supply is run in a discontinuous mode when load current falls to light-load or no-load state, preventing the slave from sinking current, therefore preventing recirculation from the master to the slave. The slave power supply is run at a lower current level than the master, preventing recirculation from the slave to the master.

Abstract: A power distributing mechanism includes a regulating circuit disposed between at least two circuit portions. The regulating circuit includes bifilar-wound windings electrically coupled to the circuit portions. In a first embodiment, the two circuit portions withdraw power from two separate power sources. The regulating circuit, in response to power withdrawn from the power sources passing through the circuit portions, proportionally allocates the withdrawn power between the circuit portions. In the second embodiment, the two circuits portions withdraw power from a single power source. The two circuit portions serve as redundant reliability backup to each other. In the event of circuit failure in one of the circuit portions, the regulating circuit in response to the failure proportionally allocates power to the remaining functioning circuit portion.

Abstract: A system and method for adjusting the maximum allowable current limit for each of a plurality of parallel power supplies within an N+1 power supply system in response to dynamic variations in the total supply current capacity of the N+1 power supply system. A plurality of parallel supplies make up the N+1 power supply which provides power to a load. A sensor within each of the parallel power supplies determines an operating status of each of the parallel power supplies. A detector circuit in communication with the sensors translates the operating status determination into a supply current capacity signal. Finally, a current limit adjustment circuit generates a current limit signal in response to the supply current capacity signal, such that the maximum allowable current limit for each parallel power supply is adjusted while maintaining the overall power supply VA limit for the N+1 power supply.

Abstract: A current mirror uses an operational amplifier to control the collector voltage of two mirroring transistors during operation. The operational amplifier is coupled to the collector of each mirroring transistor such that a differential in voltage between the collector will produce an output voltage which drives a MOS transistor. The MOS transistor, responsive to the output of the operational amplifier, adjusts the voltage at the collector of one of the mirroring transistors to restore equilibrium.

Abstract: An apparatus is provided for delaying digital data signals by fixed amounts within an integrated circuit. A delay lock loop includes an adaptive delay line, a phase detector and an integrator. The integrator provides control signals c.sub.p, c.sub.n for controlling the delay line, in dependence upon the relative phase of a reference clock signal .phi..sub.0 and a delayed clock signal .phi..sub.n. The delay line includes a plurality of delay cells. By maintaining a phase relationship .phi..sub.n =.phi..sub.0 +360.degree. one clock cycle, T.sub.c, delay through the delay line is provided. Thus each delay cell provides T.sub.c /n delay. By placing identical cells in signal paths elsewhere on a chip, fixed delays can be introduced which are controlled by the delay lock loop.

Abstract: A current split circuit that includes a multiplying digital to analog converter (DAC) and a controller. The controller establishes a first and second terminal of the DAC at the same potential so that a digital input to the DAC determines the ratio by which a current at a third terminal of the DAC is split between the first and second terminals of the DAC.

Abstract: A voltage regulator circuit of the type including a transistor having a base, an emitter representing a voltage output terminal and a collector representing a voltage input terminal, and a zener diode connected in series with the base to represent a common input-output terminal, wherein voltage regulation is achieved by the constant reverse bias voltage drop of the zener diode in combination with the constant forward bias voltage drop of the emitter-base junction of the transistor, the improvement including a second transistor having an emitter representing a second voltage output terminal with respect to the common input-output terminal, and the second transistor further having a base connected to the emitter of the first transistor, wherein voltage regulation is provided for the second output terminal with respect to the common input-output terminal by the combination of the voltage regulation provided at the first output terminal and the constant forward bias voltage drop of the emitter-base junction of th

Abstract: A DC to DC converter which gives two individually controlled and stabilized DC voltages includes an oscillator of the push-pull type and two rectifiers which are connected to the output of the oscillator. The transformer of the oscillator has a primary winding which has been split up in two halves, the end of each half being connected to a controlling DC voltage. The secondary winding of the oscillator transformer has its one end connected to the two rectifiers. The output of each of the rectifiers is connected to one input of a regulating circuit, the output of which is connected to each of the primary winding halves for delivering the controlling DC voltage.