1. Battery management system overview
In portable applications, space is extremely important. The advanced solution provided by Ti uses QFN and wafer-level chips and has high integration, intended to reduce the shape size of the solution. In addition to reducing board space occupation, many such solutions reduce power dissipation and improve overall efficiency. TI's battery management solutions support a variety of battery chemical composition and battery cells, from universally used lithium ion batteries (Li-iON) to industry standard nickel-hydrogen batteries (NIMH) and lead-acid batteries. TI's related products support wide applications, such as mobile phones, smartphones, tablets, portable consumer equipment, portable navigation devices, laptops, and many industrial and medical applications. TI has battery management devices that match your design specification, and we also provide assessment boards, applications, samples, and data sheets required to help your design faster.
2. Designing factors
Battery Chemical Composition - Each battery chemical composition has different working characteristics, such as discharge mode and self-discharge rate. Ti's battery power monitoring IC is developed in accordance with battery chemistry to compensate for these differences to accurately display the remaining electrical energy in the battery. Moreover, each battery chemical composition has a unique requirement for its charging algorithm, which is critical to maximizing its capacity, extending battery life and improving safety.
Charging Control Topology - Simple Linear Topology is ideal for low-power battery packs (eg, single or two lithium ion batteries) of less than 1A. The switch mode topology is ideal for fast charging executed by the USB port or a large battery pack that requires a charging rate greater than 1A. Switch mode conversion can minimize heat generated during charging. The wireless power topology uses a common magnetic field to provide advantages of non-contact power transmission. Wireless charging provides a portable device with an additional battery charge option, or an alternative to other 5V charging power supplies.
The input voltage -ic wide input voltage range and input overvoltage protection not only achieve maximum security, but also allows low-cost unstable wall adapters.
The number of string batteries-battery pack is composed of a series of series and parallel batteries. Each tandem or parallel battery pack must provide protection against overcharge, excessive discharge, and short-circuit conditions.
Battery management
3. Battery management solution
1) Solar charging of emerging power applications
The photovoltaic technology has achieved significant progress, and it is currently capable of achieving more cost-effective and efficient energy collection from the sun. Most of the solar collections today use high-power facilities that are responsible for providing complementary AC (AC) power to family or commercial buildings, and is usually connected to the public grid. However, many of the equipment and devices in reality have not been connected to the grid, or the grid itself is poor reliability, or the connection to the AC power is completely unreal. In these applications, it is a more practical solution for charging of batteries that are responsible for supplying power to network applications. For such applications, it is often necessary to trade between cost and photovoltaic efficiency. Embodiments maximize the power available from the solar panel, and it is also necessary to take into account the cost and size of the overall system.
The following schematic is given an example of two low-cost solar charger applications, where the battery charger is integrated with a simple circuit (to maximize the power point of the solar panel), and the circuit used for load adjustment Integrate. Simple solar street light or solar lantern can be developed by adding devices such as LED drivers. Implementation of a USB switch and a boost converter can form a simple solar charger suitable for portable devices. Other applications enable motor drivers for solar power supply fans or pumps. These are just a small part of the TI new solar charger IC series can achieve a small part of the application options.
Solar charging application block diagram
2) Hybrid motivation for emerging power applications (HEV) battery management
Battery Management Battery Management System (BMS) is one of the elements in the HEV overall architecture. The intelligent implementation can not only extend the battery life, but also expect the travel distance when the car is used in pure power drive mode, which is a key selling point for end users. The BMS module needs to have battery monitoring and battery power balance characteristics, often connect through different communication paths to ensure system redundancy. In addition, the built-in temperature management function circuit is also a crucial factor for the life and security of the system. Complete BMS represents a function of high security key; therefore, reliable communication and accurate data measurements are indispensable.
Hybrid car battery management
3) Emerging power supply application energy collection
Since people are developing a new type of alternative (off-grid) energy, power management techniques for collecting, storing, and regulating such electrical energy are required. From the energy source of energy source such as photovoltaic board, power (vibration) MEMS and thermoelectric components (using Peltier [Peltier], Tomson [Thompson] or Seebeck [seebeck] effect, how is it Ultra-low "femto" stage power is converted to a more available level and store this energy for future use. TI continuously develops new power management ICs aimed at cope with these energy collection puzzles, including ultra-low power devices such as LDO and efficient boost converters and battery chargers. These power management devices further improve the low power MCU and RF (RF), amplifiers and sensor IC products lines for Ti - thus provide a holistic solution for systems that utilize new ultra-low power alternative energy.
Energy collection application block diagram
4) Wireless power
As the earliest manufacturer, TI is a leader in the new wireless power market. WiRelessPowerConsortium is currently more than 81, TI is one of them. The alliance is developing an international standard for use QI standards to achieve interoperable wireless charging.
The BQDesla chipset allows customers to provide up to 5W of power for their electronic devices, thus complying with QI standards. Currently, the transmitter and receiver solution to form BQtesla chipsets have reached the requirements of scale production. The BQDesla receptore series includes BQ51013 and BQ51011, which can output a 5V voltage and provide closed loop control using embedded communication technologies. The software has been written to the device, so it is not necessary to perform software programming. The BQDesla transmitter series contains BQ500210 and BQ500211, operable and controlling wireless power features that meet QI standards.
Source: Wiku Electronic Market Network
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