電解電容和薄膜電容不能籠統(tǒng)的說哪個(gè)比較好，這個(gè)要在一定的使用條件下才能判斷選擇用哪種類型的電容更合適。在特定的條件下，各有各的優(yōu)點(diǎn)，在實(shí)際電路中，只要能正確做出選型就可以了。

　　Electrolytic capacitor and film capacitor can not be generally said which is better, this must be in certain conditions of use to determine which type of capacitor is more appropriate. In the specific conditions, each has its own advantages. In the actual circuit, as long as you can correctly make the type selection.

　　根據(jù)薄膜電容本身的特點(diǎn)，絕緣阻抗很高，頻率特性優(yōu)異，頻率響應(yīng)寬廣，而且介質(zhì)損失很小。但什么是頻率特性？讓我們一起來了解一下。

　　According to the characteristics of thin film capacitor, it has high insulation impedance, excellent frequency characteristics, wide frequency response and small dielectric loss. But what is frequency characteristic? Let's take a look at it.

　　1.頻率增大，薄膜電容與電解電容的空值變化。

　　With the increase of frequency, the null values of film capacitance and electrolytic capacitor change.

　　電解電容的容量隨著頻率增加逐漸減少，而薄膜電容器則基本不變。這也是我們?yōu)槭裁凑f薄膜電容的頻率響應(yīng)范圍寬的核心原因。

　　The capacity of electrolytic capacitor decreases gradually with the increase of frequency, while the capacity of thin film capacitor remains unchanged. This is the core reason why we say that the frequency response range of thin film capacitor is wide.

　　2. 頻率增大，薄膜電容與電解電容的損耗變化。

　　With the increase of frequency, the loss of film capacitor and electrolytic capacitor changes.

　　通過實(shí)驗(yàn)室的對(duì)比，得出來的結(jié)果是：隨著頻率的增加電解電容器的損耗急劇加大，但薄膜電容器的容量?jī)H有微小變化。

　　Through the laboratory comparison, the result is: with the increase of frequency, the loss of electrolytic capacitor increases sharply, but the capacity of thin film capacitor only changes slightly.

　　實(shí)測(cè)數(shù)據(jù)對(duì)比：

　　Comparison of measured data:

　　1.2uF 薄膜電容1.2uf film capacitor

　　結(jié)論：薄膜電容頻率特性非常的好，介質(zhì)損耗非常的小。

　　Conclusion: the frequency characteristic of the film capacitor is very good, and the dielectric loss is very small.

　　100uF/35V 電解電容100uF / 35V electrolytic capacitor

　　結(jié)論：電解電容的頻率特性是很差的，10KHz時(shí)容量基本就跌沒了。到了100KHz 甚至于就相當(dāng)于個(gè)電感了。介質(zhì)損耗也很大，Q值都沒有超過2。

　　Conclusion: the frequency characteristic of electrolytic capacitor is very poor, and the capacity basically drops at 10kHz. At 100kHz, it is equivalent to an inductance. The dielectric loss is also very large, Q value does not exceed 2.