What is the lithium electricity protection chip, lithium battery chip functions
now portable electronic components in China become more and more popular with everyone, its battery equipment also become special attention focal point, mainly because the power lithium battery pack and lithium polymer battery energy density, long use time and can meet the green environmental protection regulation, have gradually replace nickel cadmium battery and nickel metal hydride rechargeable batteries, into portable devices is preferable rechargeable batteries. Lithium electricity protection chip is for use in hand-held machine equipment ( Such as cellular phones, pdas) Single power lithium batteries and designing idea. Let's look at what is the lithium electricity protection chip, lithium battery pack chip functions.
what is the lithium electricity protection chip
lithium electricity protection chip is single section head of rechargeable lithium ion/polymer lithium battery charging/discharging/working current protection chip, it also contains a short circuit protection device capacity, prevent short circuit when the working current /. Choose high pressure production technology development, the compressive strength of not less than 28 V, after product inspection to discharge, the chip will suspend operation to maintain internal switch power supply circuit has at very low power consumption. According to switch to a similar level to VDD DS end, will extend the protection time ( In addition to the over-current protection circuit) Greatly shortened.
lithium battery pack chip functions
1, the protection chip operating normally:
protection chip MOS tube probably is in the off state at the beginning, the battery after good protection chip, be sure to first open MOS tube, p + and p - End is the output voltage, open for the simplest method & ndash; — B - with a transmission line And P - Wiring.
2, working current of the design of product inspection
when the VM terminal working voltage higher than a current 1 product inspection work voltage, and this situation in the working current 1 when the response time of the inspection, turn off discharge with FET and terminate discharge.
when the VM terminal working voltage higher than a voltage current 2 product inspection work, and this one condition in working current 2 when the response time of the inspection, turn off discharge with FET and terminate discharge.
3, overvoltage of the design of product inspection
when suddenly appeared rechargeable lithium-ion batteries, charging too comparator jump, charging voltage VCU product inspection work from H to L, through charging product inspection after the response time, a total ban on the battery. At the same time, the export of switch power supply circuit TCU for H, via a feedback circuit to make work of charging the comparator input voltage increases, so the battery voltage is important to reduce more to make comparator export a H. This is achieved through the working voltage of the charging delay design process.
when the battery over discharge, over discharge product inspection work voltage VDL from H to L, via the time after the TDL, a total ban on battery discharge. At this point, according to 0 v charging a total ban on module by raising the VM, and then five comparator can make the SD jump becomes invalid, the switching power supply circuit of five comparator is not functioning, and oscillator is not running, switch power supply circuit into sleep mode. When the VM reduce cause changes in the SD again, switch power supply circuit break dormancy mode. Sleep mode working current can not higher than 100 na.
4, over-current protection:
in p + p - Connected on a suitable load, the battery to discharge the current direction such as I2, working current from the positive by the load of the battery, D2, MOS1 to battery cathode, ( At this time of MOS2 is D2 short circuit) ; When the load suddenly decreases, and the IC according to VM pin sample to suddenly, big working current and working voltage IC sampling and efferent instructions at this time, let the MOS1 end, control circuit disconnect, the battery to be protected.
5, over-current protection circuit:
in p + p - Up over load, battery began to discharge the current direction such as I2, working current from the anode of the battery, D2, MOS1 the load to the battery cathode, ( At this time of MOS2 is D2 short circuit) ; IC according to the VM pin sample to work suddenly, big current and the voltage IC sampling and efferent instructions at this time, let the MOS1 end, control circuit disconnect, the battery to be protected.
lithium battery chip works
1. Lithium electricity protection chip sleep mode
CW1055 into discharge protection, prolong time and higher than the sleep mode ( Tslp) , CW1055 will enter sleep mode. DO maintain a low level, maintain high impedance state CO, maintenance has the status of the charging and discharging MOSFET. Sleep mode to remove conditions: the VM working voltage is in Vslp under working voltage.
2。 Generally the status of the working principle of
usually conditions, namely the battery voltage in a discharge product inspection work voltage ( VDL) The above and in charging product inspection work voltage ( 联邦) The following, the working voltage of VM terminals in the charger products inspection working voltage ( VCHA) The above and below working current 1 product inspection work voltage, designing idea generator module is not running, the charging control with MOSFET and opened by the both parties of MOSFET discharge control. This time can also carry out free of charge and discharge.
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