How does a circuit protect a deep discharge battery?
Deep Discharge Protection Circuits For deep discharge protection, we need to identify the cut-off voltage of the battery. After that, we need to design a circuit in which, when the battery reaches the cut-off voltage level, a switch disconnects the load from the battery. For cut-off voltage identification, we will choose a Zener diode.
What’s the maximum current a battery can discharge?
•Maximum 30-sec Discharge Pulse Current –The maximum current at which the battery can be discharged for pulses of up to 30 seconds. This limit is usually defined by the battery manufacturer in order to prevent excessive discharge rates that would damage the battery or reduce its capacity.
What’s the depth of discharge of a lead acid battery?
These batteries regularly deep discharge using most of their capacity. For a deep cycle lead-acid battery, the depth of discharge is 50%. These types of batteries are used in UPS, traffic signals, remote applications, and off-grid power storage applications.
Why is deep discharge difficult to recharge?
Also, the cut-off voltage of a battery is sensitive to operating temperature. In deep discharging, the amount of electric discharge is actually 1.5 to 2 times as great as the capacity of the battery. So when the battery undergoes over-discharging, it is very difficult to recharge it because the internal resistance of the cell has increased.
How does a Li ion battery protection circuit work?
Li-Ion Battery Undervoltage Lockout Figure 1 shows an ultralow power, precision undervoltage-lockout circuit. The circuit monitors the voltage of a Li-Ion battery and disconnects the load to protect the battery from deep discharge when the battery voltage drops below the lockout threshold.
What is lockout voltage for UVLO battery protection circuit?
Consuming virtually no current, the LT1389 and the LT1495 are ideal choices for the UVLO circuit and many other battery applications. The circuit is set up for a single-cell Li-Ion battery, where the lockout voltage—the voltage when the protection circuit disconnects the load from the battery—is 3.0V.