ownbattery

Lithium-ion (Li +) batteries, while having high energy density, dell laptop battery long life, no memory effect, low self-discharge and cell voltage higher single many advantages, but when strict attention to the use of over-voltage protection, over-discharge protection and over - protection, but also to protect the circuit requirements for high accuracy, MAX 16665/V/X respectively for 2 / 3 / 4 Li + battery pack to provide protection, including: Over-charging protection, over-discharge protection, battery mismatch protection, as well as over-current protection. Over-voltage detection function can effectively prevent any battery battery ibm thinkpad z60t battery,ibm thinkpad z61t battery, 40y6791 , 40y6793 , asm 92p1122 had a charge when the battery voltage beyond the limit set doors, CGO, TKO output high, FET Q2,Dell Inspiron 8500 Battery, Dell 8N544 Battery, Dell Inspiron 8600 Battery, Dell Inspiron 6400 Battery, Q3 was disconnected to terminate the charging process, WRN output and low-level, to the battery alarm signal issued by the controller. The highest threshold voltage battery VovT, by external resistors R1, R2 to determine its scope can be set to 4V ~ 4.4V. Under-voltage detection circuit can be used to prevent battery discharge phenomenon occurred, when the detected battery voltage is less than the threshold set VuvT when, UVO, Dso, CGO high output, TKO remain low, switch Q3, Q1 open, Q2 conduction, the battery is in trickle charge state, the battery voltage to recover. Battery low-voltage detection threshold VuvT, by R3, R4 settings, set the range of 2V ~ 3V. When the battery pack of any mismatch at 2, TKO, CGO, UVO and DSO are high, the corresponding switch Q1 ~ Q3 are off, PKF and thus lower the electronic signal to the interrupt controller. Adapter voltage detection threshold VcmT, by R5, R6 set up.

2. Compact structure of the Li + battery charger

Lithium-ion battery (Li +) with its high energy density and high performance are widely used in mobile phones, Dell Inspiron 8500 Battery PDA, notebook computers and other products. The course of a full charge, including: ① charge initialization process; in the process system to a smaller battery charge current to the battery voltage greater than 2.5V. If the temperature range in excess of 2.5 ℃ to 47.5 ℃, the charger is in the wait state. ② fast filling process; when started soon after the charge, MAX1679 to open an external P-channel FET, fast charge flow from the external current-limiting type power charging decision. Once the system detects the battery voltage reaches the Li + battery charge termination threshold voltage, the faster the end of filling. End-of-charge voltage threshold determined by the resistor RADI. ③ Pulse charging process; soon after the end of filling process, the system to enter the pulse charging process, MAX1679 open every 2ms time detection is far greater than the first time through. In addition to the circuit outside the battery pa3420u-1brs,pa3450u-1brs, toshiba satellite l10 battery ,toshiba satellite l15 battery ,toshiba satellite l20 battery ,toshiba satellite l25 battery ,toshiba satellite pro l10 battery voltage detection, MAX1679 also has a time-out detection and temperature detection, which can provide secondary protection for the battery. Need to detect the temperature should be at the THERM pin BATT-pin indirectly with a thermistor and thermistor installed near the battery. Then when TSEL pin BATT +, AD or GND, the charge corresponding to the restricted hours for 2.8 hours, 3.75 hours and 6.25 hours. Options to consider when P1 between drain-source breakdown voltage, the minimum turn-on threshold voltage, rated current and power loss and other parameters, at least drain-source breakdown voltage is higher than that under open-circuit voltage of the wall adapter 25%.

3. Nicd Battery Charger

Nickel Cadmium (Nicd) battery is one of the first application of rechargeable batteries, their energy density and weight density is relatively low, but, due to lower costs, many products are still being selected, such as cordless phones, portable instrument. Dell Inspiron 8600 Battery,Nicd battery test commonly used to terminate-ΔV detection, timeout detection, battery temperature and battery temperature rise detection rate detection. Filling in the fast mode, are usually selected with the timeout-ΔV detection, temperature detection means matching. DCIN then the output of the wall adapter, wall adapter should be higher than the minimum output voltage: 2V + (1.9V × number of cells); the highest voltage is dependent on the P-channel MOSFET breakdown voltage and input bypass capacitor resistance pressure. When DCIN less than 15V when, MAX713 pin DRV directly with the Q1, Q2 connected; DCIN than 15V, Dell Inspiron 8500 Battery, Dell 8N544 Battery, Dell Inspiron 8600 Battery, Dell Inspiron 6400 Battery, the access to Q3; R4 for Q1, Q2 to provide appropriate voltage swing. Current limiting diode D4 expanded input voltage range and an internal shunt regulator MAX713 provide a steady source of 8mA current, if provided by the wall adapter output voltage range is relatively narrow, while resistance can be used to replace D4. According to the required charging rate and battery capacity may be required to calculate the charge current IFAST, by the formula RSENSE = 0.25V/IFAST current limiting resistor to determine the size of RSENSE. PGMO ~ PGM4 change the connection number can be set up and charge the battery time limit. Nid battery for when the battery pb991a, hp business notebook nc4200 battery , hp business notebook nc4400 battery , hp business notebook tc4200 battery ,Dell Inspiron 6400 Battery hp business notebook tc4400 battery will not fully discharge the anode of cadmium hydroxide to cadmium, resulting in the battery terminal voltage drop, in order to eliminate the battery memory effect. MAX712 alternatives such as MAX713, and remove the circuit inside the dashed border, it can also be used to recharge NiMH batteries.