Introduction
Portable electronic equipment designers can choose a variety of chemical technology, management solutions topology charger and load. Choose the most appropriate solution should be a simple task, but in most cases, this process is very complicated. Designers need performance, cost, size and other requirements key to find the best balance. This paper presents the general design and system engineers to provide advice and help to make life easier for the selection. HT14X11 HT14X12 HT14X19
At 3 “C” from achieving control burden
Use rechargeable batteries for all system designers must make clear some basic design techniques to ensure it meets the three key requirements:
1, the battery safety: There is no doubt the security of the end user is the top priority in all considerations of system design. Most lithium-ion (Li-Ion) and lithium-polymer (Li-Pol) batteries contain an electronic circuit protection. However, there are a number of critical design factors to consider. Including but not limited to, the lithium-ion battery to ensure that the final stage of the regulator during the 1% tolerance, handling of the depth of battery discharge pretreatment the safety timer and temperature monitoring of the battery. HSD101PFW2 LP089WS1 LP140WX1
2, the capacity of the battery: charge the battery every solution must ensure that each cycle and each load can recharge the battery at full capacity of the state. Causes premature termination of charging the operating life of the battery, which is high power portable devices today do not want.
3, the battery life: charging procedures recommended algorithm is to ensure that end-users to complete each cycle battery, a milestone. Using the battery temperature and charge voltage limit each time, pretreatment and avoid deep discharge battery charge termination too late or normal is needed to maximize the autonomy of certain measures. LP141WX1 LP141WX3
The choice of battery chemistry
Now available in a variety of systems designers to choose the battery chemistry. Design is usually based on some of the following standard options for batteries, including:
• Energy density
• The characteristics and dimensions
• Cost
• use patterns and life
In recent years, despite the use of lithium ion and lithium-polymer growing trend, but the chemistry of the Ni is still a lot of consumer applications is a good option. LP141X10 LP141X12
Whatever type of battery chemistry, chemical technology followed each correct battery charge management technologies are essential. These technologies will ensure that each battery charge cycle can be completed at full capacity without compromising safety or shorten battery life.
NiCd / NiMH
Before the start of a cycle of charge and fast charge as much as possible before the commencement of nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries must be tested and adjusted. If the battery voltage or temperature exceeds the allowable limit is not allowed for fast loading. For security reasons, all “hot” battery (usually above 45 C) workload will be suspended until the battery to cool to normal operating temperature will run again. To cope with a “cold” battery (generally less than 10 C) or over-discharge of batteries (each battery is typically less than 1V), the need to carry a net current moderate. Dell Studio 1555 battery Dell Studio 1735 battery
When the battery temperature and voltage of the load properly when the quick start. Usually 1C or less constant current charging of the NiMH battery. Some NiCd batteries can be charged up to 4C rate. Terminated by the appropriate authority to avoid overloading harmful.
In nickel-based rechargeable batteries, the charging voltage rapid termination or temperature functions. Figure 1 show a typical peak voltage detection terminal voltage when the peak voltage of each cell in the range of 0 ~-4mV, fast charging is completed. Based on the temperature of the charge termination method is to observe the rapid rate of increase in battery temperature T / t for detecting fully charged. Typical T / t was 1 C / min. Dell Studio 1536 battery Dell Studio 1537 battery