Wireless local area network card power management circuit and wireless internet access terminal with circuit

Abstract

The invention discloses a wireless local area network card power management circuit and a wireless internet access terminal with the circuit. The wireless local area network card power management circuit comprises a DC / DC voltage stabilizer with function of limiting input current; and an input pin of the DC / DC voltage stabilizer is connected with a power access end, and an output pin of the DC / DCvoltage stabilizer is connected to a follow-up function circuit of an internet access card to provide working power supply for the follow-up function circuit. The wireless local area network card power management circuit has simple circuit structure, high power conversion efficiency, low integral power consumption of a system, few used devices, simple wiring, low cost, and small space area occupied on a circuit board, so the wireless local area network card power management circuit can contribute to miniaturization design of the wireless internet access terminal, and can stably and reliably protect a computer connected with the wireless internet access terminal.

Description

technical field [0001] The invention belongs to the technical field of power circuits, and in particular relates to a power management circuit for a wireless network card and a wireless Internet access terminal designed by adopting the power management circuit of the wireless network card. Background technique [0002] In the past two years, with the rapid development of 3G communications mainly based on data services, 3G wireless network cards have also entered people's lives in large numbers. As one of the three mainstream standards of 3G, CDMA20001xEVDO technology has The reason of low radiation, and highly promoted. EVDO is actually an abbreviation of three words: Evolution, Data, and Only. Its full name is CDMA20001xEVDO, which is an evolution stage of the 3G standard CDMA2000 used by China Telecom. As the most important EVDO data service communication terminal, EVDO wireless network card has several types such as USB interface and mini PCIE interface. The wireless net...

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Problems solved by technology

[0006] This design method of using a discrete current limiter and a discrete step-down DC / DC regulator to form a wireless network card power management circuit has a disadvantage of high hardware cost (the cost of two chips is added to the Together, plus peripheral decoupling capacitors and other devices), the conversion efficiency is low (the efficiency of the two devices is multiplied to the overall efficiency), and the area occupied by the circuit board is relatively large, which is not conducive to making the network card small and compact, and the PCB wiring It is also more troublesome to wait

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