Each time a battery goes through a cycle charge to discharge isĬonsidered a cycle lifetime. Cycle lifetime and lifespan are different.Taking the battery voltage below the cutoff point shortens battery lifespan. Minimum cutoff or disconnect voltage is the voltage assuming the cell has drained.Attempting to charge more is possible, but comes with the risk (sometimes catastrophic) of reducing lifespan. Maximum safety operating voltage is the voltage termed as fully charged and ready.Table 1 shows the typical characteristics of the most common secondary/rechargeable single-cell battery types. Secondary Batteries for Portable Electronics The above-mentioned ratings change based on the battery capacity, which isĭirectly proportional to the form factor or the size. Not adhering to these conditions can cause the battery The amount of heat or cold they can withstandĮach of these restrictions affects the battery's lifespan.Minimum safety voltage (the voltage level to which they can be used).Maximum safety voltage (the voltage level to which they can be charged).The amount of current they can take in (during charging).The amount of current they can provide for a specified range of output voltage over time.Secondary batteries wear out, possess a charge-discharge lifecycle, and come with certain restrictions, including: Safety rating, life span, cost, and vice versa. There are also trade-offs to consider: the higher the specific power, the lower the Theseĭifferences, in turn, dictate the specific power (maximum current delivered to load), lifespan, and thermal Secondary or rechargeable batteries differ in their chemical composition and structure from one to another. Temperature monitoring using comparators, this application note first covers some basic, yet important, Before examining battery voltage monitoring and Different systems can require different priorities from theĪforementioned list, affecting the overall system design. But a careful trade-off must be made, keeping power, speed, accuracy, cost andįorm factor (space constraints) in mind. There are also sophisticated battery monitors and fuel gauges designed Into the loading conditions, ambient temperature, or the presence of a fault.Īn analog-to-digital converter (ADC) or comparator with window function provides a simple solution to monitorīattery voltage and temperature. It is also essential to monitor the battery case temperature, since this offers valuable insight Similarly, when theīattery output is higher than required, a flag can be asserted when the battery is completely charged and needs noįurther charging. Tput voltage is lower than required, the battery is discharged and needs to be recharged. Monitoring and controlling the state of the battery supply is another of their critical functions. TheseĬircuits flag the micro (usually in the form of interrupts) to perform the required duty when some event occurs. To prevent system power dissipation, the controller needs to remain in a sleep state for extended periods as it seeks out flags present in the GPI pins.įor continuous monitoring of the system's vital functions, many engineers are turning to low-power circuits. Make sense to have the controller do all the work. The typically power-hungry controller is the system’s workhorse, so it does not The system as a whole, microcontrollers/microprocessors serve as the "brains" managing the system reliably and Systems engineers have an important task when it comes to budgeting their design's power requirement. Monitoring Battery Voltage and Temperature
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |