Joke Collection Website - Talk about mood - This paper briefly introduces the knowledge about the withstand voltage of ceramic chip capacitors.

This paper briefly introduces the knowledge about the withstand voltage of ceramic chip capacitors.

Nowadays, this era belongs to the era of electricity, and relying on this powerful carrier, electricity has also produced many branches and countless creations, from semiconductors to integrated chips. , make this society change with each passing day. And many widgets are also closely related to our lives. Someone needs to study it, someone needs to create it, and more people need to use it. Ceramic capacitors are such devices. Today, let's look at the withstand voltage of ceramic capacitors.

Nominal and identification method of capacitance;

1. direct method: if the number is 0.00 1, it means 0.00 1uF= 1nF; if it is 10n, it is 10nF, which is also1nf.

2. Direct representation of nonstandard units: 1~4 digits, and the capacity unit is pF, for example, 350 is 350pF, 3 is 3pF, and 0.5 is 0.5pF.

3. Color code representation: Different colors are used to represent different numbers along the lead direction of the capacitor. The first and second rings represent capacitance, and the third color represents the number of zeros (in pF) after significant digits. Color meaning: black =0, brown = 1, red =2, orange =3, yellow =4, green =5, blue =? Ceramic capacitors include high-voltage ceramic capacitors and ordinary ceramic capacitors. In the past, the withstand voltage of ordinary ceramic capacitors was 50V, and that of high-voltage ceramic capacitors was several hundred volts and several thousand volts. Generally speaking, XXKV is marked below the capacitor.

Several methods of capacitor capacity appraisal;

1. Direct identification: For example, its electrolytic capacitor capacity is 47uf, and its capacitor withstand voltage is 25v.

2. Use unit nf: The polyester capacitor in the above figure is nominally 4n7, that is, 4.7nf, which is 4,700 pf when converted into PF. Other examples: 10n, that is, 0.01uf; 33n, that is, 0.033uf, and the latter 63 refers to the capacitor withstand voltage of 63v.

Third, the mathematical counting method: such as porcelain capacitor, the nominal value is 104 and the capacity is:? 10x 10000 pf = 0. 1 uf。 If the nominal value is 473, it is 47X 1000pf=0.047uf (the following 4 and 3 both represent the power of 10). Another example is: 332=33X 100pf=3300pf. ? The use of capacitors should work under the specified withstand voltage. At present, many products with low quality are faulty due to the use of capacitors with insufficient withstand voltage (common capacitor bursting).

Capacitance identification:

1. Capacitance is generally represented by "c" plus a number in the circuit (for example, C 13 is represented by the number 13). Capacitor is an element with two metal films attached to each other and separated by insulating material. The characteristics of capacitors are mainly blocking DC and circulating AC. ? The size of the capacitor means the amount of electric energy that can be stored. The blocking effect of capacitance on AC signal is called capacitive reactance, which is related to the frequency and capacitance of AC signal. ? Capacitance XC= 1/2πf? c? (f is the frequency of AC signal and c is the capacitance)? The types of capacitors commonly used in telephones include electrolytic capacitors, ceramic capacitors, patch capacitors, monolithic capacitors, tantalum capacitors and polyester capacitors.

2. Identification method of capacitance: The identification method of capacitance is basically the same as that of resistance, which is divided into three methods: direct standard method, color standard method and number standard method. The basic unit of capacitance is farad (F), and other units are millifarad (mF), microfarad (uF), nanofarad (nF) and picofarad (pF). Where: 1 Farah = 10? 3 millifarads = 10? 6 microfarads = 10? 9 Nafa = 10? The capacitor is directly marked with the capacitance value of 12 picofarad capacitor, such as 10? uF/ 16V? The capacitance value of a small-capacity capacitor is expressed by letters or numbers. Letter: 1m= 1000? Ufida? 1P2= 1.2PF? 1n= 1000PF? Digital representation: Generally, three digits are used to represent the capacity, the first two digits represent the effective digits, and the third digit is the ratio. ? For example, 102 means10×102pf =1000pf224 means 22× 104PF=0.22? ultrafiltration membrane

3. Capacitance error table? Operator? Number? f? g? j? k? l? m? Allowable error? 1%? 2%? 5%? 10%? 15%? 20%? For example, the capacitance of a ceramic chip is 104J, which means the capacitance is 0. 1? UFIDA, the error is 5%.

So the above is how to identify some parameters of ceramic capacitors. The author has comprehensively summarized them, and I believe it can help friends with different needs. And this kind of device, we say that parameters determine everything and quality determines everything, that is to say, we must choose the right parameters, otherwise it will be invalid or unusable. Then when you buy again, you must pay attention to carefully identify the relevant capacitors, so the method of identifying ceramic capacitors is introduced here today.

Tubatu Online provides you with "every decoration quotation, 1-4 local decoration companies, 3 sets of decoration design schemes" and the decoration pit avoidance strategy for free! Click this link:/Zhu Ye /zxbj-cszy.php? to8to _ from = SEO _ zhidao _ m _ jiare & amp; Wb, you can get it for free ~