Cell Phone Power Management Need To Be Cautious

ON Semiconductor vice lead designer of sales Lin Jianming The far east: the near future, sales of mobile phone devices and adapters will turn out to be completely separate, which will pose a cellular telephone side of the examination charge. Dell Inspiron 6000 power supply

Lin Jianming: If you don't have perfect internal overcharge protection circuit, the battery will overcharge might result in an explosion of truly serious consequences.



Charging the phone interface, over-voltage is undoubtedly quite possibly the most dangerous. Poor quality with the adapter, failure or user error a different device adapter could happen. In general, your smartphone charge management IC may control the charge ongoing and voltage, to take care of the security charge the variety. However, if the rated current belonging to the input voltage is too high while charging, over billing management circuit can withstand value, the circuit components can be adjusted because of charge-off or burned out of hand power and role. This worst case, at this time around if the user equally uses low-cost lithium batteries, could not complete overcharge safety circuit, the battery will overcharge might result in serious consequences of this kind of explosion. To this end the provisions belonging to the phone in YD/T1591-2006 within the side to contain over-voltage protection circuit to prevent such from happening. Overvoltage safeguard (OVP) circuitry detects over-voltage problem conditions, the detection circuit will likely be switch off, disconnect the product and the adapter output. DELL Latitude E6400 Power supply

Power Management Products National Semiconductor Senior Application Bring about Zhongjian Peng: charge management circuit functions normally charge because of the management of single chips (Charger IC), or integrated charge-management functions of power management chip (PMU) to obtain. Rechargeable lithium battery management circuitry to back up features for the drip charge, constant current getting, constant voltage charging on the three charging process, and really should have protection mechanisms to protect yourself from overheating. Advanced charge management circuit also needs the input voltage over-voltage proper protection function. The protection of the safety from the product itself is critical. Some unqualified charge administration circuit, often lack the protection on the design, the circuit itself may damage the system overheating, and up serious security issues. ACER TM00741 Power supply

MPS Marketing Director Yuan Wenlin Asian countries: a new generation from rechargeable IC PMU have together with charging function through your highly integrated hardware to achieve high reliability, but also need to have OVP (overvoltage protection), OCP (overcurrent protection), NTC functionality, both a high enter voltage, small size as well as simple external circuit. USB charger for battery management IC need to be consistent with low standby vitality / charge current programmable switching / charging form multiple input / may set the input power charger or USB harbour, and automatically charge the battery and cellular telephone distribution work be latest; and in accordance with the help of standard USB port from the limit.

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Power Integrations抯 essential regulator device, such because LinkSwitch, can maintain the electrical insulation, and does not require optical isolators with regards to feedback to provide accurate output voltage. This can keep your charges down, help design a scaled-down charger, while maintaining the essential security clearance.

The most recent LinkSwitch-II products with accurate voltage control, can be very accurately simulated UNIVERSAL SERIES BUS port. In addition, products include cable drop payment, so regardless of cable above the extent of the losing of current, voltage can end up being kept constant. Sony VGP-BPS8 Power supply

LinkSwitch-II 5% voltage reliability, current accuracy of 10%, with the adapter and charger is actually ideal. Also, it requires 20 components to improve a complete AC vitality, which saves the cost of components itself, but saves production time, putting your unit together and inventory costs. "In China and taiwan, labor costs have increased to around 0. 003 Ough. S. dollars each element cost, for small patchy opposition and capacitor, in the money necessary for Shangzhangfuduo Gengda. " Doug Bailey in Road.

MPS full array of battery charging chips are produced using questionable technology, have a minimal 20V, maximum 28V in voltage, and have been automated over-voltage protection and meet the low standby power requirements. To comply with USB OTG low standby capability requirements, a new generation of MP-2605X series will reduce the standby latest to 40uA, and enhance the reverse input voltage safety (-16V) function, following a MPS charge chips popular:

MP2605 standard charge is true of all chip general hand-held moveable devices; MP26056 support USB / adapter couple of input interface for USB interfaces want to charge the portable gadget; MP2607 built pwr trail, can be automatically sent to to charge the battery additionally, the phone work current required for high-end hand-held portable devices such as smart phones, GPS routing, PDA applications.

"Based on customer comments, they are using MPS of charge chips, the great majority Yin Wei cost considerations Ercai Yong PMU and single chip charge management, but only to see defects line charge account all Ke Fan Xiu back the volume of more than 20%, but cause the cost increase; but wishes to be using external components to raise the safety factor PMU, the extra cost and board region, also makes the business difficult to sustain. Here if the use for MPS battery charging chip, cost and product quality is usually strikes a balance. "Yuanwen Lin claimed.

TI抯 bq24070 series and bq24032A series gives a separate charge path not to mention system power path, effectively avoid the repeated charge and discharge system problems, battery everyday life is greatly extended; resolve the cellular telephone a full charge any battery consumption issues began to extend the standby precious time 10 ~ 20%; effectively prevent the system out of hand due to CPU crash and also the risk of charge, to prevent a result of external pressure and breakdown voltage within the issue, greatly increasing the reliability on the system; eliminates the additional over-voltage protection, and trail switching MOSFET and Schottky diode, cutting down total system cost. The adapter current consumption from the system and charge redistribution concerning the automatic on-demand, using a minute adapter, but greatly accelerated the charge time and keep costs down while improving the person experience. Acer Aspire 5000 solar battery

"TI advocates the method of dynamic power management in power supply management applications has been recognized by customers, such as dual-port (USB, AIR CONDITIONING UNIT adapter input, respectively) linear impose management chip bq24032A series, single-port bq24070 Series (USB, AC adapter to talk about an input), "Zhang seemed to be said.

ON Semiconductor has introduced some overvoltage protection chip. AIR CONDITIONING UNIT adapter for wall charging plug the NCP347/348, provide up to 2A of charge cell phone current and voltage transients up to 28V fault protection; NCP360 in addition to NCP361 USB interface, made for positive over-voltage protection controller, with minimal 35礎 current consumption to get to know USB standby requirements, NCP361 has a current limit function; to meet the cell phone charger / power supply to accessories such as demand for bi-directional up-to-date control, ON Semiconductor moreover forthcoming NCP370, provide? 28V overvoltage safeguard and adjustable current restrict.

SGM4054 as St Microelectronics state management the leader introduced the first product has now passed the test in several applications and high-volume products, the main features consist of: programmable charge current nearly 800mA, high-capacity battery can perform the fast charge; warm calibration can prevent constant current, constant voltage process mode, the battery overheating and help the safety of consumer services; by USB directly to somewhat of a single battery charge, to meet up with the multi-product compatibility; having charging indicator, providing anyone identification information; 1% impose precision, to ensure battery life; low shutdown up-to-date of 25礎, promote the effective by using power; own 2. 93V trickle charge threshold, rechargeable lithium battery is usually fully consistent with any standards process (trickle charge, constant current charging, frequent voltage charged off recognition); having automatic recharge feature, to produce sufficient energy. Follow-up will probably launch high-pressure, high billing current of charge management chip, to meet the brand new demand for mobile contact application for more electrical power. ACER AS07B72 Battery

Nation's Semiconductor for different applications-rich charge management solution. A solitary chip charge management snack (LM3658), support for USB, AC-DC regulator of a few inputs, and have overheating protection. There are many highly integrated power management food (PMU) has well-integrated charge-management functions. Such as GPS, PMP types PMU LP3913, the enclosed support for USB, AC-DC regulator of 2 input and support on the charge current path software snap. There are many applications created for mobile phones PMU while LP3919, more up to 28V overvoltage protection.