Portable electronic products in the past mainly uses disposable batteries Laptop Battery or alkaline batteries as a power supply is different now, whether laptop, mobile phone or MP3/MP4 player, have all the basic use of lithium ion, nickel-cadmium or nickel-hydrogen rechargeable batteries, not only reduces the use of Cost is conducive to environmental protection, and more importantly, a larger battery capacity can be done in order to obtain longer battery life. Rechargeable batteries because of their characteristics to the system developers have also made new demands, in order to make rechargeable batteries have a longer life, the correct charging circuit design and device selection is essential, whether it is an external charger, or system Internal rechargeable power management program is required depending on the use of careful consideration.
Single-chip charge management programs or will become a mainstream
In portable products, battery charging can usually be two ways, one is to use the system itself host MCU plus a pulse-width modulation and demodulation unit dell Inspiron 1520 battery (PWM) to achieve, and the other is to use highly integrated single-chip charge management IC . "Single-chip charge management IC's greatest strength is to have a higher reliability, while the MCU + PWM program is even more cheap and cheerful." Fujitsu Microelectronics Marketing Manager Wang Yun In an interview with reporter an interview, he explained, "System Manufacturing providers can in terms of cost, reliability and so comparing the two options is better, you can choose the most suitable program. In the long run, with the single-chip charge management IC for cost reduction and external communications functions, as well as the increase, more the application of choice among the more reliable single-chip would become a trend. "
According to Wang Yun introduced Fujitsu's dell Inspiron 1521 battery charge management products are mainly targeted at the 2Cell above market, and 2 ~ 4Cell applications have to be among the biggest market in notebook computers. From 15 years ago, Fujitsu power management R & D team and Fujitsu notebook R & D departments, began developing the charge management for laptops IC. Through several generations of continuous development and improvement of products, new research and development of the lithium battery charge management ICMB39A132 and MB39A134 in Taiwan and mainland China makers are applied in many other places, but also by the recent high-profile Internet access to this market's attention. "In the notebook computer applications which, due to a few years ago rechargeable battery explosions happened one after another so that all notebook manufacturers charging part of the design of the design of increasingly importance in the management of part of the charge would prefer to use a high quality, stability and reliability of the big brand power management IC. "he said.
However, BCD Semiconductor Corporation from AC / DC Products Dr. Wu Xin, director of MCU + PWM is more optimistic about the program, Dell Inspiron 1720 battery he considered that the formation of special charge management IC circuit control scheme is simple, but relatively simple function, usually only on the specific parameters of the lithium-ion battery conduct charge, and different models of portable products are often using a different model specifications of lithium-ion batteries, if we adopt special chip, it will result in duplication of development efforts and waste of resources.
"Using MCU + PWM to achieve Buck circuit and control method of low-cost flexible and can easily be improved and upgraded, can be applied to a variety of lithium-ion batteries." Xin Wu said.
BCD Semiconductor is an analog signal integrated circuits in the Greater China manufacturers (IDM), engaged in power management IC product design R & D and manufacturing. Unlike the rest of the market Fabless design firms, BCD Semiconductor has a 6-inch dell Inspiron 1525 battery wafer fabs
(Including Bipolar, CMOS, BiCMOS, and BCDMOS production process), can take advantage of product design and integration of advanced technology to optimize product performance and cost in order to provide a cost-effective application solutions.
In fact BCD Semiconductor's focus is on low-cost, high efficiency AC / DC off-line power adapter / charger controller chip, the company in 2006 developed the first generation of primary-side controller AP370x series is the first launch of its kind on the market one of the products. According to reports, AP370x using the original edge control and output cable compensation proprietary technology, built-in temperature compensation and transformer primary side inductance compensation, you can save optocoupler and secondary case of feedback control circuit to achieve high-accuracy output voltage and current control , thereby greatly reducing the number of power circuit components and simplify circuit design has been successfully used in mobile phones, wireless public telephone, cordless phones and wireless routers and other products charger / adapter. "In order to further improve the power conversion efficiency, reduce standby power consumption, we have further introduced the industry-leading five-star standards to meet the second generation of the primary side controller AP376x series, its no-load power consumption less than 30mW can easily meet the energy of the Star EPSv2.0 and five-star dell Inspiron 1526 battery standard mobile phone charger all of the world, including the charger / adapter, and no-load energy efficiency standards. "Xin Wu said.
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