Nec Corporation

Hiroshi Tachikawa

Hideharu Yajima

A control circuit for controlling a plurality of power supply modules connected in parallel to provide power to a single load. The control module first converts first analog data corresponding to a voltage level which is applied to the load. The control module then compares the voltage level to a predetermined voltage level and computes a voltage deviation between the predetermined voltage level and the voltage applied to the load. The control module then computes whether the voltage deviation is within a proper limit or not. The control module then sends a pulse width data signal corresponding to the voltage deviation to the power supply modules in order to control the amount of power each module supplies to the load.

Power control system for electrical power supply modules

In a power supply control system including first through N-th power supply units for generating first through N-th output voltages, the first through the N-th power supply units producing first through N-th failure signals on occurrence of failure in the first through the N-th power supply units, respectively. A sequence control unit carries out a power on sequence which is for sequentially putting the first through the N-th power supply units into an on state in voltage increasing order of the output voltages and carries out a power off sequence which is for sequentially putting the first through the N-th power supply units into an off state in voltage decreasing order of the output voltages. A failure detection control unit, in response to one of the first through the N-th failure signals, simultaneously puts a specific unit of the first through the N-th power supply units that produces the one of the first through the N-th failure signals and the power supply units having the output voltages which are not lower than that of the specific unit into the off state and subsequently puts the power supply unit having the output voltages which are lower than that of the specific unit into the off state in accordance with the power off sequence.

Power supply control system comprising a plurality of power supply units

A parallel operation power supply control system has a plurality of switching power supply modules for supplying electric power in parallel to a logic device, and a parallel operation power supply control module connected to a superior controller for control of the plurality of the switching power supply modules. Each of the plurality of the switching power supply modules comprises a DC-DC converter, a drive pulse generator for driving the DC-DC converter, and an electric current feedback unit for detecting an electric current outputted from the DC-DC converter and for feeding the detected result in the form of a first data to the parallel operation power supply control module. The parallel operation power supply control module comprises an arithmetic processor for arithmetically processing the first data fed from the plurality of the switching power supply modules to produce corresponding second data, a plurality of error amplifiers for producing error data according to the second data and a voltage inputted into the logic device and for outputting the error data to each drive pulse generator, and a basic pulse generator for outputting basic pulses to each drive pulse generator.

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Yamanashi, Japan

Hiroshi Tachikawa