Patent ID: 6697265
Filing Date: 2004-02-24
Classification: H02M

Abstract:
A dc power supply for supplying dc current to a load having a resistance within a predetermined load resistance range, comprising:a) input terminals connected to a source of dc power; b) an inverter circuit for converting the dc input voltage into an alternating voltage of a predetermined high frequency that is coupled to a rectifying bridge circuit for converting the alternating voltage to a dc output voltage; c) the rectifying bridge circuit comprising first and second rectifier ac input terminals coupled to the inverter circuit, a positive rectifier output terminal and a negative rectifier output terminal, and a plurality of rectifiers connected in series between the positive and negative rectifier output terminals; d) a plurality of capacitors connected in series between the positive and negative rectifier output terminals, e) a junction of a pair of the rectifiers and a junction of a pair of the capacitors connected to each other and to the second rectifier ac input terminal such that the capacitors provide a capacitive reactance at the predetermined frequency between the second rectifier ac input terminal and the positive and negative rectifier output terminals; and f) a positive load output terminal coupled to the positive rectifier output terminals, and a negative load output terminal coupled to the negative rectifier output terminal.