Browse Prior Art Database

MODULAR AND FLEXIBLE POWER CONTROL

IP.com Disclosure Number: IPCOM000008946D
Original Publication Date: 1999-Jan-01
Included in the Prior Art Database: 2002-Jul-25
Document File: 3 page(s) / 113K

Publishing Venue

Motorola

Related People

Eli Zilca: AUTHOR [+3]

Abstract

The following will describe a modular and a flexible power control for mobile radio under a fixed or unstable power supply and rapid changes of the power control input signals which has different operational voltage level and priority.

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Technical Developments

MODULAR AND FLEXIBLE POWER CONTROL

by Eli Zilca, Michael Meriin and Joseph Ziv

INTRODUCTION

  The following will describe a modular and a flexible power control for mobile radio under a fixed or unstable power supply and rapid changes of the power control input signals which has different operational voltage level and priority.

PROBLEM(S) TO BE SOLVED

  Mobile devices such as mobile radios are usual- ly working under car battery power supply. That power is unstable and very noisy due to car opera- tion and noise which is received on long lines. Mobile devices are using switches with long lines to control the hardware and the software. In that case the device must overcome the noise which is on the long input lines and on the power supply.

  The common method to handle this problem is to clean the noise by hardware filters which handle a specific noise signal for specific car module. Measurements show that different cars have

extremely different noise characteristics, which is very difficult to handle using hardware filters. The noise duration can change from 1pSec up to 4Sec and the voltage drops can be 0-1lV in a common battery source (13.8V +/-20%).

The following illustration (Figure 1) is a typical power block control used for mobile devices.

Power Control Block is mainly based on hard- ware. It has two main characteristics:

1. Pied electrical characteristic for the input lines.

2. Hard-coded priorities

  Every input line in the block is designed for a particular signal characteristic without any option to change the specification. Moreover, it was designed for specific input line number, without flexible option either to increase or to reduce the input lines number.

Fig. 1

Q Motorola Inc. 1999 64 Jammy 1999

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MOTOROLA Technical Developments

  The input lines are designed with a fixed priori- ty level which is encoded into two input data lines. Those lines are read by the microprocessor without any real time information about the status of the three input lines, except for the encoded priority data. This limits the software with inflexible soft- ware option.

  The noisy UNSW battery source is connected to a hardware filter which cleans...