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Peak current control in wireless network interface devices

A technology for wireless network and interface equipment, which is applied in the field of peak current control in wireless network interface equipment, and can solve the problem that capacitors are not acceptable solutions.

Inactive Publication Date: 2006-06-21
SIERRA WIRELESS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While overcapacitors have been utilized similar to those described above to attempt to achieve compliance with the CF+ standard, these attempts have failed because the wireless modem draws more current from the host power supply than the maximum current draw limit of 500mA even with the addition of overcapacitors
Therefore, just using overcapacitors is not an acceptable solution to achieve code compliance

Method used

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  • Peak current control in wireless network interface devices
  • Peak current control in wireless network interface devices
  • Peak current control in wireless network interface devices

Examples

Experimental program
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Embodiment Construction

[0017] refer to image 3 , shows an example effective series resistance (ESR) control system 30 that may be used to control the ESR of a host power rail 300 of a power supply to a host device in accordance with an embodiment of the present invention.

[0018] According to this embodiment, when a wireless network interface device (e.g., a wireless modem) coupled to power mains 300 is transmitting (e.g., during burst transmission), the interface device's transmit TX ENABLE (transmit enable) signal is used to enable field Effect transistor (FET) 302 is off. Under these conditions, the current drawn by the wireless network interface device's power amplifier (PA) 304 bypasses FET 302 and flows through the series combination of FET 306 and resistor 308 . In an example embodiment, the ESR under these conditions is 0.83Ω. On the other hand, when PA 304 is not transmitting, FET 302 and FET 306 are on, and current flows through FET 302 and the series combination of FET 306 and resistor...

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PUM

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Abstract

Methods and apparatus are provided for varying and controlling the effective series resistance of a power rail configured to deliver power from a power supply of a host device to a wireless network interface device, such as a wireless modem. Varying and controlling the effective series resistance of the power supply rail relative to the effective series resistance of the overcapacitor coupled to the power supply rail allows control of the current drawn from the host power supply and the overcapacitor. During periods when the wireless network interface device is transmitting or will be transmitting, increase the effective series resistance of the power supply rail so that it exceeds the effective series resistance of the overcapacitor, thereby allowing the wireless network interface to be drawn first from the overcapacitor rather than from the host power supply current of the power amplifier of the device. During the period when the wireless network interface device has completed transmission or is about to complete transmission, the effective series resistance of the host power supply is lowered so that it is lower than the effective series resistance of the overcapacitor, thereby causing the overcapacitor to enter a charging state.

Description

technical field [0001] The present invention generally relates to current control in electrical equipment. More specifically, the present invention relates to peak current control in wireless network interface devices such as wireless modems, for example. Background technique [0002] Communication devices, such as mobile phones, allow voice communications over wireless communication networks. Such devices are common in today's world. In recent years, efforts have been made to exploit the usefulness of existing wireless communication systems so that not only voice information but also messages such as from portable (i.e., laptop) computers or personal digital assistants (PDAs) can be transmitted over the wireless network. data. One result of this effort is the General Packet Radio Service (GPRS) standard, which provides a packet-switched data overlay for the Global System for Mobile Communications (GSM) wireless cellular system. [0003] GPRS utilizes the "slotted" princ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/26G06F1/32H04B1/04H04B1/38
CPCH04B1/38H04B2001/0416
Inventor 刘平布鲁斯·米勒雷切尔·翁
Owner SIERRA WIRELESS