Patent ID: 6525947
Filing Date: 2003-02-25
Classification: H02M

Abstract:
A power supply apparatus comprising:a DC voltage source; an output terminal to supply a power to an external load, the external load being connected to the output terminal; a diode provided between the DC voltage source and the output terminal, the diode having the anode thereof connected to the DC voltage source and having the cathode thereof connected to the output terminal; means for detecting a forward voltage of the diode; means for detecting a forward current of the diode; and means for controlling a DC voltage generated from the DC voltage source; the control means controlling a DC voltage generated from the DC voltage source so that the anode potential of the diode remains constant, and dropping the output terminal voltage in accordance with the forward current detected by the forward current detection means, and raising the anode potential of the diode in accordance with the forward voltage detected by the forward voltage detection means; and wherein the control means controls a DC voltage generated from the DC voltage source in accordance with a differential voltage between a reference voltage source and the anode potential of the diode, and raises the anode potential of the diode by adding the forward voltage detected by the forward voltage detection means to a reference voltage of the reference voltage source.