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Multiple power supply system

Image Number 4 for United States Patent #5179493.

Among a plurality of power supply circuits arranged in a power supply monolithic integrated circuit, output voltages of power supply circuits except for an external microcomputer power supply circuit are monitored by a protective circuit. When an abnormal output appears at least one of the power supply circuits, the outputs of all the power supply circuits except for the microcomputer power supply circuit are cut off.

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