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超级电容工作时间计算

超级电容工作时间计算是指在超级电容电路中，根据电容器的电容量、电压和电路中的负载电流等参数，计算超级电容器可以供电的工作时间。超级电容是一种高能量密度、高功率密度的电子元器件，可以用于存储和释放电能。超级电容器在许多应用领域都有重要的作用，例如电子车、医疗器械、军事装备等。在超级电容工作时间计算中，需要输入以下参数：超级电容器的电容量：以法拉（F）为单位，指超级电容器可以存储的电荷量。超级电容器的额定电压：以伏特（V）为单位，指超级电容器可以承受的最大电压。负载电流：以安培（A）为单位，指超级电容器供电给电路的电流。通过输入以上参数，超级电容工作时间计算可以计算出超级电容器可以供电的工作时间，同时也可以计算出超级电容器的充电和放电时间等参数。需要注意的是，在实际应用中，超级电容器的工作时间还会受到其他因素的影响，例如超级电容器的内阻、负载电路的变化等，因此在进行实际应用时，需要结合具体情况进行选择，并进行充分的测试和验证。

Working hours of ultracapacitor
  Max Vcap   Min Vcap   Capacitance VBAT Max
  V   V  

Fala

V
  IBATMax   IBATTypical   Linear IBAT  
 

nA

　

nA

　

Ohm(calculated value)

　 Hour 　 Hour 　

Hour

For trickle charging RTC

The calculator determines the working time of the supercapacitor when it is powered by the supercapacitor according to the starting and ending voltages, discharge currents and capacities of the capacitor.
 
Among them:

  • The maximum Vcap corresponds to the maximum value of the VCC, and the relevant data can be consulted, i.e. (VCC maximum) - diode voltage drop.
  • The minimum Vcap is the minimum value of the working voltage of the RTC oscillator, and the relevant data can be consulted.
  • The maximum value of IBAT is the maximum current of the battery, and the relevant data can be consulted.
  • The typical IBAT value is the typical battery current defined at 25 C and nominal power supply voltage, and the relevant data can be consulted.
  • The maximum value of VBAT is the maximum voltage of VBAT pin, and the relevant data can be consulted.
IBAT maximum and IBAT typical values are used to calculate the maximum IBAT and the working hours (hours) of typical IBAT. When calculating the working time, it is assumed that the IBAT current is kept constant without considering the voltage of the battery input pin.

When calculating the working time of linear IBAT, it is assumed that the oscillator current is proportional to the input voltage, that is, the resistance characteristic. The equivalent resistance of the circuit is calculated by the IBAT maximum and VBAT maximum provided in the data, which is used to calculate the battery backup time.


Specification table example

Recommended DC working conditions(TA= -40°C to +85°C)

Parameter Symbol Condition Min Typical Max Potential
Supply voltage VCC 2.7 3.0 3.3 V
Battery voltage VBAT 1.3 3.0 3.7 V
Table 1

DC electrical characteristics(TA= -40°C to +85°C)

Parameter Symbol Condition Min Typical Max Potential
Battery current IBAT 600 1000 nA
Table 2
Typical RTC Trickle Charger internal circuit


Figure 1

Note: Some diode selection circuits allow the selection of 1 or 2 diodes in series, while others allow the selection of 0 or 1 diodes. It is assumed that the voltage drop of each diode is 0.7V.

Typical RTC circuit with super capacitor backup power supply

Figure 2

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