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Gross Voltage Regulation Module Inside an AC/DC Power Supply

IP.com Disclosure Number: IPCOM000083149D
Publication Date: 2005-Mar-01
Document File: 2 page(s) / 222K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for placing a system's gross voltage regulation module (gVRM) inside the AC/DC power supply, so that efficiency losses in the circuit take place upstream of the U/L limitation for power. Benefits include recovering substantial board space, and creating an output that is exempt from U/L limitations.

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Gross Voltage Regulation Module Inside an AC/DC Power Supply

Disclosed is a method for placing a system’s gross voltage regulation module (gVRM) inside the AC/DC power supply, so that efficiency losses in the circuit take place upstream of the U/L limitation for power. Benefits include recovering substantial board space, and creating an output that is exempt from U/L limitations.

Background

Current U/L restrictions limit power delivery to 240W downstream from the AC/DC power supply (see Figure 1). This causes substantial efficiency losses (~25%) to take place through the voltage regulation circuitry and components on the motherboard. After conversion losses, the output of the VRM is limited to ~180W. Therefore, the available power to the key components (i.e. CPU, memory, etc.) is substantially less than what is allowed. Future generations of processors will consume more than the 240W U/L limit; this leaves a power gap that must be addressed.

General Description

The disclosed method places the gross voltage regulation components and circuitry as an integrated module (i.e. gVRM) in series with one of the outputs within the AC/DC power supply (see Figure 2). There must be adequate volume within the power supply chassis to accommodate the additional space of the gVRM. The output of the gVRM requires a flex circuit to transfer the output voltage of the VR to the application.

Advantages

In the disclosed method, the output power is less than 2V after passing through the gVRM; the...