Datasheet

使用指南 Application Guidelines
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Index
被動電壓平衡 Passive Voltage Balancing
被動電壓平衡可用電壓分配電阻與每一EDLC并聯來實現。這可讓電流從高電壓的EDLC上流至低
電壓的EDLC上從而實現電壓的平衡。最重要是選擇平衡電阻值以提供EDLC更高電流的流動而不
增加EDLC的漏電流。須記住在高溫下漏電流是會上升的。
Passive voltage balancing uses voltage-dividing resistors in parallel with each EDLC. This allows current to
flow from the EDLC at a higher voltage level into the EDLC at a lower voltage level, thus balancing the voltage.
It is important to choose balancing resistors values that provide for higher current flow than the anticipated
leakage current of the EDLC, bearing in mind that the leakage current will increase at higher temperatures.
被動電壓平衡只在不經常進行EDLC充放電使用和使用能承受平衡電阻的額外電流負載時推荐使
用。建議所選擇的平衡電阻應能提供最差EDLC漏電流50倍以上的額外電流 (根據最高使用溫度選
擇3.3kΩ~22kΩ的電阻)。盡管更大阻值的平衡電阻在大多數情況下也能工作，但其不可能在不匹
配的電容器串聯時起到保護作用。
Passive voltage balancing is only recommended for applications that don
’
t regularly charge and discharge
the EDLC and that can tolerate the additional load current of the balancing resistors. It is suggested that
the balancing resistors be selected to give additional current flow of at least 50 times the worst-case EDLC
leakage current (3.3kΩ to 22kΩ depending on maximum operating temperature). Although higher values of
balancing resistors will work in most cases they are unlikely to provide adequate protection when significantly
mismatched parts are connected in series.
主動電壓平衡 Active Voltage Balancing
主動電壓平衡電路能使串聯的EDLC上的電壓與特定參數電壓相同，而不管有多少電壓不平衡產
生。同時確保在穩態情況下准確的電壓平衡電路能有效地降低電流，而且只在電容電壓發生不平衡
時才要求更大的電流。這些特性使得主動電壓平衡電路是EDLC頻繁充放電及如電池等能量組件使
用的最理想電路。
Active voltage balancing circuits force the voltage at the nodes of series connected EDLC to be the same
as a fixed reference voltage, regardless of how many voltage imbalances occur. To ensure accurate voltage
balancing, active circuits typically draw much lower levels of current in steady state and only require larger
currents when the capacitor voltage goes out of balance. These characteristics make active voltage balancing
circuits ideal for applications that charge and discharge the EDLC frequently as well as those with a finite
energy source such as a battery.