The best tea in Taiwan Province. Sacon- Korean capacitor manufacturer, quality 8 wrong. GSC- king of critical pulp. Jack Kang-worse than GSC. . . A generation of critical pulp king. Ost-Explosicum is easy, as famous as GSC. . . Brand identification of famous capacitors (for reference only) Ruby is produced in Japan and is a well-known brand-name capacitor with excellent quality. The riot pattern is K-shaped, and the words "You eat chaff" are written on the side. NICHICON is an old capacitor factory in Japan, and its reputation is similar to that of the famous Rubycon. However, its current level is better than RUBYCON's, because NICHICON now has aluminum solid polymer conductor capacitor-F55 series. However, compared with Sanyo, CHEMICON and other brands, the general index of NICHICON capacitor is relatively low, and the ESR value of its top-end product is still at the level of 10 milliohm (Sanyo's tantalum polymer shunt capacitor can reach 5 milliohms). Basically, NICHICON's progress has been slow. The riot pattern is cross-shaped (the most rubbish cottage capacitor is also cross-shaped), and the words nichicon are written on the side. Sanyo's position in electrolytic capacitor industry is a bit like Samsung's position in high-definition multimedia industry. Because Sanyo capacitors have the most types and output, the technical level of research and development is also one of the best. From the performance point of view, Sanyo may not be the top brand, but from the comprehensive evaluation of production scale, supply capacity, quality control ability and research and development level, Sanyo is definitely the leader in the capacitor industry today. It is also a K-shaped riot pattern, and the words Sanyo on the surface are NCCNippon Chemi-con, that is, Japanese chemical industry. There is no label on the NCC capacitor skin. The motherboard is nothing more than KZG and KZE series riot patterns similar to Mercedes-Benz logo, and the corresponding KZG or KZE series Panasonic name will be on the side. This is the familiar Panasonic. Panasonic's electrolytic capacitors and ceramic capacitors are very strong. However, Panasonic's high-end products are mainly tantalum solid polymer capacitors, so they are rarely used in general hardware. In addition, Panasonic's electrolytic capacitor gold series is also very famous. The anti-riot pattern is T-shaped, with M logo on the side: Heky YXF, YXG MV-AX, MV-CX FC (P2, P3, K6 era level) HD, HV KZE ZL, ZLh MV-WX FM (P3, K7 era level) H M, HC KZG MBZ MV-WG FJ (K7, P4, K8). Ruby and nichicon are really good in the capacitor industry, but the price is not affordable for everyone and the delivery time is very long. At that time, many domestic capacitor products could completely replace Japanese products, so why use Japanese products?
What brand of electrolytic capacitor is good?
Hello, I have also worked in the capacitor industry for a long time. Let me introduce myself. I am not an agent or dealer of Nichicon. According to my own experience and market information feedback, I have compiled some suggestions on how to choose capacitor brands.
For consumer electronics, I personally recommend rubycon. To tell the truth, the capacitance of ruby below 63V is really good, and the quality and sales volume are second to none.
Used in industrial electrolytic capacitors (Horn &; Bolt), it is recommended to choose Nichicon or NCC, which are sworn enemies in this industry, with both quality and price at the same level. In industrial electrolytic capacitors, Nichicon &；; NCC has the absolute right to speak.
Thin-film capacitors, with the rise of photovoltaic and other industries, the requirement of high rated voltage makes thin-film capacitors gradually replace aluminum electrolysis in this field. One of the best thin film capacitors at present is EPCOS in Germany. Of course, the domestic farad capacitor technology and market are developing rapidly (personally, it is the pride of national industry). Of course like Nichicon &；; NCC can also make high-quality thin film capacitors, but the whole company does not regard this as the development center.
What kinds of capacitors are there?
As one of the passive components, the capacitor has the following functions:
1, which is applied to power supply circuit to realize bypass, decoupling, filtering and energy storage functions. The classification is described in detail below:
1. Bypass
Bypass capacitor is an energy storage device that provides energy for local equipment. It can make the output of voltage regulator uniform and reduce the load demand. Just like a small rechargeable battery, the bypass capacitor can charge and discharge the device. In order to minimize the impedance, the bypass capacitor should be as close as possible to the power supply pin and the ground pin of the load device. This can well prevent high ground potential and noise caused by excessive input value. Grounding elasticity refers to the voltage drop when the grounding connection passes through the high current burr.
Take out lotus root
Going to lotus root is also called going to lotus root. As far as the circuit is concerned, it can always be divided into driven source and driven load. If the load capacitance is relatively large, the driving circuit needs to charge and discharge the capacitance to complete the signal jump. When the rising edge is steep, the current is relatively large, so the driving current will absorb a large power supply current. Because the inductance and resistance in the circuit (especially the inductance on the chip pin will rebound), this current is actually a kind of noise compared with the normal situation, which will affect the normal work of the previous stage. This is called "coupling"
Decoupling capacitor acts as a "battery" to meet the change of driving circuit current and avoid mutual coupling interference. It will be better understood by combining bypass capacitor and decoupling capacitor. Bypass capacitor is actually decoupled, but generally refers to high-frequency bypass, which is a low-impedance leakage prevention method to improve high-frequency switching noise. High frequency bypass capacitance is generally small, generally 0. 1μF, 0.0 1μF, etc. Calculating the resonance frequency according to the resonance frequency; The capacity of decoupling capacitor is generally large, which may be more than 10μF, depending on the distribution parameters in the circuit and the change of driving current.
Bypass takes the interference in the input signal as the filtering object, and decoupling takes the interference in the output signal as the filtering object to prevent the interference signal from returning to the power supply. This should be their essential difference.
filter
Theoretically (that is, assuming that the capacitance is pure capacitance), the larger the capacitance, the smaller the impedance and the higher the pass frequency. But in fact, most of the capacitors exceeding 1μF are electrolytic capacitors, and the inductance component is relatively large, so the impedance will become larger after the frequency is high. Sometimes we can see that the electrolytic capacitor of a large capacitor is connected in parallel with a small capacitor, and then the large capacitor is connected to the low frequency and the small capacitor is connected to the high frequency. The function of capacitor is to pass high resistance and low resistance and pass high frequency and low frequency. The larger the capacitance, the easier it is for low frequency to pass, and the larger the capacitance, the easier it is for high frequency to pass. Specifically used for filtering, large capacitance (1000μF) filters out low frequency, and small capacitance (20pF) filters out high frequency.
Some netizens vividly compared the filter capacitor to a "pond". Because the voltage across the capacitor does not suddenly change, it can be seen that the higher the signal frequency, the greater the attenuation. It can be said vividly that the capacitor is like a pond, and the water quantity will not change because of adding or evaporating a few drops of water. It changes the voltage into the current. The higher the frequency, the greater the peak current, thus buffering the voltage. Filtering is the process of charging and discharging.
Store energy
The energy storage capacitor collects the charge through the rectifier and transmits the stored energy to the output end of the power supply through the converter lead. Commonly used aluminum electrolytic capacitors (such as B43504 or B43505 of EPCOS) have a rated voltage of 40 ~ 450 VDC and a capacitance of 220 ~150 000 μ f.. According to different power requirements, devices are sometimes connected in series, parallel or in combination. For the power supply with power level exceeding 10KW, a large can spiral terminal capacitor is usually used.
2. Used in signal circuit, which mainly completes the functions of coupling, oscillation/synchronization and time constant:
1. connection
For example, the emitter of a transistor amplifier has its own bias resistor, and at the same time, it makes the signal generate a voltage drop and feed it back to the input end, forming the coupling of input and output signals. This resistor is an element that produces coupling. If a capacitor is connected in parallel between the two ends of this resistor, the coupling effect produced by the resistor will be reduced, because the impedance of the capacitor with appropriate capacity to AC signal is very small, so it is called decoupling capacitor.
2. Oscillation/synchronization
Load capacitance including RC, LC oscillator and crystal all belong to this category.
3. Time constant
This is an ordinary integrating circuit composed of R and C in series. When the input signal voltage is applied to the input terminal, the voltage on the capacitor (C) gradually rises. And its charging current ... > >
What kind of capacitor is good for high frequency capacitor?
Mica capacitor and ceramic capacitor have the best high frequency.
What kinds of capacitors are there? What's the role?
Too many, including dielectric classification, capacitor packaging classification, polarity and non-polarity, the difference between withstand voltage and capacity. Different materials have different stability. The main function is to connect AC and rent DC. It has the function of electricity storage. Compensate the power factor at high power. It is widely used in electronic circuits, such as filtering, oscillation, coupled signals, calculus circuit applications and so on.
What kind of capacitance meter is better?
The larger one is CM960 1A, and the smaller one is CM7 1 15A, which is the best-selling model.
The former is around 60 yuan, and the latter is around 50 yuan. The price of the treasure is.
Which capacitor manufacturer is better?
At present, our company uses the safety regulations of ceramic capacitors. Y capacitor is purchased from the capacitor manufacturer, and I have visited the hardware facilities of the factory, which is still good.
Which ruby capacitor has good quality?
Ruby's capacitors are only in series, and there is no difference between good and bad.
The parameters of different series are different, and this choice depends on the project.
Ruby is a brand. The workmanship and materials in Japan are very good, but the price is very expensive. Few people will use it if it is not for the special needs of the project. After all, the cost is too high.
At the same time, there will be no shortage of such big brands and fakes in the market.
The better brands on the market are sapphire and Black King Kong.
If you don't understand, you can ask here Thank you.
(There is a sapphire capacitor here.)
Which capacitor is better, y5v or x5r?
According to the standard of electrical engineering society (EIA), MLCC of different dielectric materials can be divided into three categories according to temperature stability: ultra-stable (engineering) dielectric materials are COG or NPO；; The stable (secondary) dielectric material is X7R；; A dielectric material Y5V of energy grade (III) can be used.
X7R capacitor is called temperature stable ceramic capacitor. When the temperature ranges from -55℃ to+125℃, the capacitance changes to 15%. It should be noted that the capacitance change of the capacitor is nonlinear at this time.
The capacity of X7R capacitor varies with time under different voltage and frequency conditions. Every 10 year changes 1%δC, indicating that 10 year changes by about 5%.
X7R capacitor is mainly used in industrial applications with low requirements, and its capacity change is acceptable when the voltage changes. Its main feature is that the capacitance can be made larger under the same volume.
Cog, X7R, X5R and Y5V are all capacitor materials. The temperature coefficient and working range of several materials decrease in turn, and the frequency characteristics of different materials are also different.
The main difference among NPO, X7R, Z5U and Y5V lies in their different filling media. Under the same volume, due to the different filling media, the capacitance of the capacitor is different, and the dielectric loss and capacitance stability of the capacitor are also different. Therefore, when using capacitors, different capacitors should be selected according to their different functions in the circuit.
NPO capacitor
NPO is the most commonly used single-chip ceramic capacitor with temperature compensation characteristics. Its filling medium is composed of rubidium, samarium and some other rare oxides. NPO capacitor is one of the most stable capacitors in capacitance and dielectric loss. When the temperature ranges from -55℃ to+125℃, the capacitance changes by 0.30 ppm/℃, and the capacitance changes with frequency by less than 0.3 Δ C. The drift or hysteresis of NPO capacitor is less than 0.05%.
NPO(COG) multilayer chip ceramic capacitor is one kind of capacitor.
COG (Chip on Glass) means that the chip is directly bonded to the glass. This installation method can greatly reduce the size of LCD module and is easy for mass production. Suitable for LCD of consumer electronic products, such as mobile phones, PDA and other portable products. Driven by IC manufacturers, this installation mode will be the main connection mode between IC and LCD in the future.
Compared with the thin film capacitance greater than 2%, it can be ignored. The variation of typical capacity relative to service life is less than 0. 1%. The capacitance and dielectric loss of NPO capacitor vary with the frequency of different package forms, and the frequency characteristics of large package size are better than those of small package size. The following table gives the capacity range of NPO capacitor.
NPO capacitors are suitable for tank capacitors of oscillators and resonators, as well as coupling capacitors in high frequency circuits.
2x7r capacitor
X7R capacitor is called temperature stable ceramic capacitor. When the temperature ranges from -55℃ to+125℃, the capacitance changes to 15%. It should be noted that the capacitance change of the capacitor is nonlinear at this time.
The capacity of X7R capacitor varies with time under different voltage and frequency conditions. Every 10 year changes 1%δC, indicating that 10 year changes by about 5%.
X7R capacitor is mainly used in industrial applications with low requirements, and its capacity change is acceptable when the voltage changes. Its main feature is that the capacitance can be made larger under the same volume. The following table shows the capacity range of X7R capacitor.
Tri-Z5U capacitor
Z5U capacitor is called "universal" ceramic monolithic capacitor. The first consideration here is the temperature range. For Z5U capacitor, it is mainly small in size and low in cost. For the above three ceramic monolithic capacitors, the Z5U capacitor has the largest capacitance under the same volume. However, its capacitance is greatly influenced by environment and working conditions, and the aging rate can be reduced by 5% every 10 year.
Although its capacity is unstable, due to its small size, low equivalent series inductance (ESL) and equivalent series resistance (ESR), good frequency response and wide application range. Especially in the application of decoupling circuits. The following table gives the value range of Z5U capacitor.
Other technical indexes of Z5U capacitor are as follows: working temperature range+10℃-+85℃ temperature characteristic +22%-56% and maximum dielectric loss of 4%.
4Y5V electricity ... >>
What kind of capacitor should I choose for the filter capacitor?
Large electrolytic capacitance