| 摘要 |
PROBLEM TO BE SOLVED: To supply a power supply unit and a power supply system which stabilize the ground potential of electronic equipment relative to grounding to enhance the stability of the electronic equipment and to suppress the generation of noises. SOLUTION: Capacitor input type rectifying/smoothing circuits are constituted of a rectifying circuits 2 for inputting a commercial AC power supply AC for rectification and a smoothing circuit 3 to supply DC voltage to a DC-DC converter 4 and capacitors C1 to C4 are connected in parallel to four diodes D1 to D4 in the rectifying circuit 2 as a full-wave rectification diode bridge circuit. The diodes D1 to D4 are energized only near the peak voltage of the commercial AC power supply and the ground potential is grounded via the capacitors C1 to C4, allowing the ground potential of the electronic equipment to be stabilized for prevention of the generation of noises and improvement in the stability in circuit operation. COPYRIGHT: (C)2008,JPO&INPIT
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