Patent ID: 7499301

Claim:
A plugtype power supply unit, comprising: an enclosure defining a frontwall; a plug portion secured to said frontwall of said enclosure; a low-voltage cord extending from a rear part of said enclosure; a PCB of a switch mode power supply circuit accommodated in said enclosure, said switch mode power supply circuit comprising a transformer for power converting and a capacitor for regulating an input voltage, said plug portion and said low-voltage cord electric connected with said PCB, projection on said frontwall of each cross section parallel to said frontwall of said PCB and components of said switch mode power supply circuit mounted on said PCB not exceeding the range of said frontwall, and structural configuration of said frontwall corresponding to and not exceeding the cross-sectional configuration of a plug face of an American type plug according to the NEMA 1-15P standard; a plurality of slots is formed in said PCB between a dangerous high-voltage side and a low-voltage side of said switch mode power supply circuit; and a plurality of ribs extends from an inner wall of said enclosure corresponding to the plurality of slots at said PCB, not only for isolating components or wires at both sides of said slot of said PCB, but also for strengthening mechanical integrity of said enclosure.