The shunt circuit is normally a power transistor and a current-limiting resistor in series, and then connected in parallel with single cells. In the charging process through the control channel power transistor, in the discharge process power transistor conduction, increasing the load on the high voltage battery, discharging it faster rate than other batteries, enabling battery equalization. When all the batteries have reached the same state of charge, the battery pack is obtained from the total energy will increase relative to the pre-EQ, and each single battery will not overcharge, over discharge, thereby extending battery life. 2 balanced protection circuit design,2.1 equalization circuit protection, From the balanced circuit topology to points, the common design of centralized balanced and independent balancing two kinds, concentrated equilibrium is controlled by the controller relay networks to switch between different monomers, a balanced unit with the same battery of different monomers balanced management, This method requires the hardware device is simple, but the relay network control logic requirements, the battery pack can only monomers within a balanced, low efficiency. Several independent balancing equalization unit. 3 balanced protection experiments and conclusions Balanced voltage 3.5v ~ 4.5v can be adjusted, slowly washed equalizing currents can reach 150mA, fast red equalizing currents can reach 1.5A; fully charged to ensure each single cell is smaller than the difference between the voltage set value (usually ± 20mV), realization of each single cell batteries are charging. Be allowed between each single cell error of more than 15% of the nominal capacity and still be able to reach both charge the battery pack in every single cell in fully charged but can filled and pressure. This series of products can be -25 ? ~ +60 ? ambient temperature range and long-term stable and reliable operation, this module is only suitable for lithium iron phosphate battery use. The company's lithium iron phosphate equilibrium 1 to 12 strings circuit board has been applied in practice. Experimental results show that the effect is very good. Dell nt379 battery Apple MacBook 13 inch MB466*/A Accu Compaq 383493-001 Battery Apple MacBook 13 inch MB403LL/A Battery Toshiba pa3672u-1brs battery
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