Constant voltage (CV) pulse charging is the most cost-effective solution
Rechargeable energy storage capacitors have attracted worldwide attention due to their flexibility, low maintenance requirements and low total cost.
For compact applications, traditional electrolytic capacitors are an environmentally friendly alternative and offer a wide voltage range. But with output requirements exceeding a few hundred milliwatts, they quickly reach the energy storage limit.
Electric double layer capacitors (EDLC) provide high power, high energy density and long operating life, but like batteries, they operate at lower voltages. Electronic systems require a balance between these technologies, which has the advantages of both conventional and double-layer capacitors without its drawbacks. Hybrid ENYCAPTM 196 HVC capacitors provide this capability. To get the most out of your product, you must use a reliable charging solution. This paper points out that constant voltage (CV) pulse charging is the most cost-effective solution.
Hybrid capacitor technology and propertiesThe hybrid system combines electrostatic energy storage and inductive energy storage methods, making it possible to achieve faster battery charging speeds. The power density of a hybrid capacitor system can easily exceed the battery and the energy density is significantly higher than that of a double layer capacitor.
Due to the use of inductive energy storage methods, hybrid capacitors have a narrow operating voltage range similar to batteries. While this voltage stability is beneficial in many applications, care must be taken in capacitor voltage and current management to maintain optimum performance over long operating life.
Never exceed the maximum cell voltage. Therefore, in order to achieve the longest life, power management must ensure that the operating voltage is absolutely accurate within the specified millivolt range.
Also consider that the current flowing through the hybrid capacitor is partially related to the inductive conversion process. Since these processes require a certain amount of time, the maximum allowable current must be maintained for a period of time during charging and discharging.
The self-discharge of the hybrid capacitor is significantly lower than that of the electric double layer capacitor. For example, the self-discharge level of ENYCAP 196 HVC is less than 5%/day.
Since the inductive energy storage process always includes some material conversion, it is obviously necessary to avoid overcharging. Even though the ENYCAP 196 HVC has short-term tolerance in this respect, it must be considered that even if there is no suitable control measure for a long period of time, even a low charging current will overcharge the capacitor.
Hybrid capacitors have better cycle life performance than batteries. For example, the ENYCAP 196 HVC can achieve more than 50,000 cycles.
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