HP 8000 HP Enterprise/Mid-Market Desktop PC Power Supply Architecture - Page 4

HP AC Adapter with Smart ID Technology No standard governs external power adapters commonly used by notebook PCs and some smaller form factor desktop designs (i.e., the HP USDT form factor). For many reasons, the notebook PC industry has not centered on a common interface standard. External AC adapter power supplies are critical to this product segment, and because of the sensitive relationship between the power supply and the notebook itself, OEMs prefer to constrain the power supply to a proprietary design that is specifically qualified for use with their particular product. The connector design is also unique to prevent unqualified power supplies from being used. The HP notebook product group has develop the HP standard interface for the single-output, external power adapters used across other product divisions including the HP Personal Systems Group (PSG) that produces consumer and business PC products. Several HP business PC platforms, including the Ultra Slim Desktop and All-in-One platforms use external power adapters designed by the business notebook development teams. The HP external power adapter design enables special features, such as the Smart ID technology, that give HP the flexibility to deliver customer-valued innovation. While this is not an industry standard, it is an example of industry standards failing to meet the needs of HP and its customers. The primary output voltage of external power adapters is approximately 19V and is always on. Operating voltages, +12V, +5V, +3.3V, and +5VSB, must be generated on the motherboard. HP Mid-Level/Enterprise PC Power Supply Architectures The following sections summarize the power supply architectures implemented on HP Mid-Level/Enterprise PC products prior to 2009 and our transition to the current architecture. Each form factor utilizing internal power supplies employs a power supply architecture specific to the needs of the particular system. It is important to note that HP business PC platforms have not followed the Intel ATX power supply standard for many years. 4