Analysis of the most popular battery consumption t

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Using battery power consumption analysis to improve the working time of mobile devices

by using special tools and analysis technology, you can help you create a mobile device design scheme to extend the working time of batteries

battery working time has always been a key factor in the design of mobile wireless devices. As mobile devices become smaller and lighter, using large batteries is not a good choice. Instead, the design must maximize battery capacity. Analyzing battery power consumption can help optimize the battery working time of these devices

battery power consumption analysis is not just about estimating battery working time. Battery consumption analysis requires testing and verification equipment, sub circuits and batteries, which should be carried out both independently and in combination. It includes using various methods, using different equipment working modes and parameters to verify the battery power consumption, so as to see how the equipment work affects the battery power consumption. This can analyze the design shortcomings that affect the current consumption, and then design the equipment to maximize the battery working time

examples of using battery power consumption analysis to extend battery working time in the design phase of mobile wireless devices include:

analyzing the difference in power consumption caused by changes in data transmission and optimizing working time. Some changes include the relationship between packet length and the number of packets, and the number of data channels used changes with transmission time

quantify the difference in power consumption caused by changes in digital baseband work, and optimize the power efficiency of data processing

identify abnormal behaviors and measure their impact on power consumption. Abnormal events include abnormally long or high 2. The protection and maintenance pulse of the bellows ring stiffness testing machine, as well as the random overload that leads to premature shutdown due to insufficient power and reduces the working time of the battery

quantify the power consumption distribution, help determine the dynamic power and current requirements, and allow the selection of corresponding batteries, regulators and power management circuits

traditional methods

by examining the traditional methods used to test the working time of the battery, it can be used as a basis for discussion to explain why these methods are not enough for the system with better analysis and description of battery power consumption

a traditional method to check the working time of the battery is to use the voltage depletion time test. Using a carefully charged battery, place the DUT in the working mode to be inspected so that the adherend can be combined with the material to be inspected. Record the change of battery voltage with time during DUT operation and final shutdown. In Figure 1, the voltage inflection point of 2.25 hours shows the time of DUT operation before power shortage and shutdown

this method has many advantages. It is relatively simple to implement, and the voltage measurement is very concise, which will not affect the accuracy of the results. Since the change speed is slow, a low sampling rate is sufficient. Finally, because it is a full-length test, users can use dynamic working conditions that simulate actual environmental conditions to run benchmark type tests

one disadvantage of this method is that it takes relatively long time. Once started, it must run until the end to determine the battery working time. Another disadvantage is that the result depends on the initial state of the battery, which changes greatly and does not necessarily represent a typical battery. In addition, the only result is working time. Verifying the power consumption and battery capacity of the DUT can achieve much higher confidence in the operating time results

another way to determine the working time of the battery is to measure the power consumption. This method also uses a fully charged battery, and the DUT is placed in the operating mode to be evaluated. Then measure the average power consumption within the specified time, which is considered to represent the overall operation time. Then divide the claimed battery capacity expressed in milliampere hours by the power consumption measured in milliamperes to calculate the working time

the advantage of this method is that it takes much less time to determine the operating time of the battery than the total operating time, and the average power consumption is now quantified. If the claimed battery capacity is a representative time of DUT load, the working time should be more accurate

The disadvantage of the power consumption method is that due to the high-speed and high amplitude pulse load, the current needs to be sampled at a high rate to ensure accurate average value. One specification recommends a sampling rate of

50 kHz. Another disadvantage of affirming accurate lubrication methods and methods is that running a short-term test itself is not as good as running a long-term benchmark test under a series of different working conditions. In addition, measuring current is more difficult than measuring voltage, which is easy to cause errors

ideal system

the traditional method of measuring the working time of battery has many limitations, which can not provide the necessary information and provide the required information for optimal design. An ideal system for measuring and analyzing battery power consumption will:

correctly supply power to the DUT, record the battery depletion voltage, verify the working time, accurately measure the current from milliampere level to ampere level, and be able to record power consumption and other data in a few minutes to days, meeting the requirements of various test environments

provide a post test summary of basic test results, such as running time, average current Average voltage and consumed ampere hours and watt hours

provide data analysis to understand how abnormal operation affects battery working time and realize design optimization

based on these requirements, the general system in battery power consumption measurement and analysis will have the composition elements shown in Figure 2. The traditional solutions and better new methods for each element are introduced below

first of all, a means is needed to put the DUT in the corresponding working mode that you want to test (DUT exciter). For mobile, the base station simulator is usually used to interact with it to provide necessary protocol communication for DUT operation. Second, it requires a means to correctly power the DUT, which can use batteries or power supplies. The power supply is suitable for DUT testing independent of the battery. Similarly, battery regulators/analyzers help evaluate batteries independently of the DUT. Other important system elements are the sensors used to measure current without introducing errors, the equipment to digitally convert and record voltage and current signals in the long term, and the system to store digital test results and provide post test analysis

power option

power supply provides a controlled power supply for the DUT. The battery is running

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