Patent ID: 8952671
Filing Date: 2015-02-10
Classification: G05F

Abstract:
1. A power supply apparatus configured to supply a stabilized power supply voltage to a power supply terminal of a device via a power supply line, the power supply apparatus comprising: a main reference value setting unit configured to generate a voltage reference value which represents a target level of the power supply voltage; a first A/D converter configured to receive, via a feedback line, an analog voltage measurement value that corresponds to the power supply voltage supplied to the power supply terminal of the device, and to analog/digital convert the analog voltage measurement value thus received so as to generate a digital voltage measurement value; a digital calculation unit configured to generate a main control value by digital calculation such that the digital voltage measurement value matches the voltage reference value; a main D/A converter configured to digital/analog convert the main control value, and to supply an analog power supply signal thus obtained as a result to the power supply terminal of the device via the power supply line; a main detection resistor arranged on a path of the power supply line, and configured to be capable of switching its resistance; a main sense amplifier configured to generate an analog main current measurement value which represents a current value of a power supply current that flows through the power supply line based on a voltage across the main detection resistor; a second A/D converter configured to analog/digital convert the analog main current measurement value, so as to generate a digital main current measurement value; and an auxiliary current source configured to supply an auxiliary current to the power supply terminal of the device via a sub-path that differs from the power supply line when the resistance of the main detection resistor is switched.