Shenzhen capacitor, also known as double capacitor, gold capacitor, supercapacitor and farad capacitor, is a chemical element developed from the 1970s and 1980s. Supercapacitors store energy through polarized electrolytes without chemical reaction, and the process of energy storage is reversible, which is precisely because this supercapacitor can repeatedly charge and discharge hundreds of thousands of times. The difference between Farad capacitor and ordinary capacitor is the difference in capacity.
Series Specification Sheet:
Rated voltage VR
Operating temperature range
Normal temperature cycle life: 25°C, 500,000 cycles between VR and 1/2VR , capacity decay ≤30%, internal resistance change ≤4 times
High temperature endurance life: 85℃, keep VR , 1000 hours, capacity decay ≤30%, internal resistance change ≤4 times
Product performance table:
AC internal resistance mΩ1KHz
24h leakage current uA
Product size mm
1) Portable equipment: notebook computer, video camera, PDA, digital camera, portable DVD, etc
2) Household appliances: two-way radios, walkie talkies, electric toys, electric bicycles, emergency lighting
3) Military equipment
4) Medical treatment
5) Electric tools
1 Constant current discharge method
(1) Measurement circuit
Figure 1 - Constant Current Discharge Method Circuit
2 Measurement method
◎ The DC voltage of the constant current/constant voltage source is set to the rated voltage (UR ) .
◎ Set the constant current value of the constant current charging and discharging device specified in Table 1.
◎ Switch the switch S to the DC power supply, and charge it with constant voltage for 30 minutes after the constant current/constant voltage source reaches the rated voltage.
◎ After charging, switch the switch S to a constant current discharge device to discharge with a constant current.
◎ Measure the time t1 and t2 of the voltage across the capacitor from U1 to U2, as shown in Figure 2, and calculate the capacitance value according to the following equation :
Figure 2 Terminal voltage characteristics of capacitors
C capacity (F);
I discharge current (A);
U1 measures the initial voltage (V) ;
U 2 measures the termination voltage (V);
t 1 Time (s) for the discharge voltage to reach U1;
t 2 Time (s) for the discharge voltage to reach U2.
See Table 1 for the discharge current I and the voltages U1 and U2 at which the discharge voltage drops .
3 Equipment: A, ARBIN supercapacitor test system B, linear DC stabilized power supply C, constant current discharge device D, voltage recorder
Test method: AC impedance method
The measurement circuit shown is tested.
Figure 3 - AC Impedance Method Circuit
The internal resistance Ra of the capacitor should be calculated by the following formula:
Ra AC internal resistance (Ω);
U RMS value of AC voltage (V rms);
I AC current rms value (V rms).
The frequency at which the voltage is measured, should be 1kHz.
The AC current should be 1mA to 10mA.