Lithium-ion / Li-polymer
NiCd and NiMH similar as possible before the test of fast charging lithium-ion battery and adjust. Validation and processing methods and the methods used are similar. Dell Inspiron 1300 Screen Dell Inspiron 1420 Screen
As indicated, after checking and preview with lithium 1C or less common ion rechargeable batteries until the voltage of the battery reaches its limit at this time. The charge phase is usually added up to 70% of battery capacity. And then, usually with a constant voltage of 4.2V, the battery charge. For the safety and capacity of the battery, the charging voltage must be stable for at least 1%. During this charge, the battery current gradually pulls down. The expense ratio 1C, once the current levels up to 10-15% of the initial charge are ended normally pays less.
Switch mode and linear charging topology comparison
Traditionally, computers using the linear charging topology. This method has many advantages: low cost of implementation, simplicity of design, not high-frequency switching operation without noise. However, the linear topology will increase the energy system, especially when the battery capacity due to charge a rate of increase in time. If designers can not manage the design of heat, and it will be a major drawback. Dell Inspiron 15 Screen Dell Inspiron 1501 Screen
When the PC’s USB port as a source of energy, there are other drawbacks. In many of today’s portable design has a USB charging options, and can provide up to 500 mA charge rate. The linear solution, given its low efficiency, can be transmitted from the PC USB “power” the amount was greatly reduced, leading to the charging time is too long.
This is the mode switch topologies have their reasons uses. topology switching of the main advantages of efficiency. And different linear regulator switch (or switch) to run in the saturation region, which significantly reduces the overall loss. power losses include Buck converter switching losses (in the power switch) and the filter inductor in the DC loss. According to the different design parameters, the effectiveness of these applications, it is much higher than 95% of cases is not surprising. Dell Inspiron 1520 Screen Dell Inspiron 1521 Screen
When people hear the term switch mode most people think of when large IC inductor PowerFET a large and very large! Indeed, although the processing of applications, hundreds of amps of current is indeed the case, but the next generation solution for mobile devices Run the program is not the case. A new generation of lithium-ion battery charger switch mode with the highest level of chip integration, the use of frequencies above 1 MHz to minimize the inductor size. Figure 1 illustrates the market today began selling these solutions. The silicon chip the size of less than 4 mm2, its integrated high-side and low side PowerFET. Following the 3MHz switching frequency, the solution requires a small inductor 1UH, its size only: 2mm x 2.5mm x 1.2mm (LxWxH). Dell Studio 1436 battery Dell Studio 1535 battery
Charger options
Battery Charger tool allows designers to select the correct charger for the process easier.
About author
Director responsible Masoud Beheshti battery current management of IT. His power and battery management in the design, product definition, strategic marketing and business management for over 19 years. Masoud is a graduate of Ryerson University (Ryerson University, Toronto, Canada), Bachelor of Science degree in electrical engineering, and later graduated from Southern Methodist University (Dallas) has received MBA Finance and Marketing. Dell Studio 17 battery Dell Studio 1435 battery