WEE Technology Company Limited - WEE are Capacitors Specialist

How to choose audio frequency capacitor? These five parameters let you identify the capacitance

Basic information Capacitance, voltage and Temperature

*Electrostatic capacity, expressed in UF. The common ones are 0.1uF, 0.22uf, 0.47uf, 1uF, 6.8uf and so on.

*The working voltage (WV) should be the nominal safe value, that is to say, the nominal voltage should not be exceeded in the application circuit.

*Temperature, most of the common 85 degrees, 105 degrees. Under high temperature conditions, 105 ℃ nominal is preferred. In general, the optimization of high temperature coefficient is helpful to improve the performance of other parameters.

Dispersion factor (DF)

Sometimes the DF value is also expressed by the loss angle tan. Whether the DF value is high or low is related to temperature, capacity, voltage and frequency; when the capacity is the same, the higher the withstand voltage, the lower the DF value. The higher the frequency, the higher the DF value and the higher the temperature.

Equivalent series resistance ESR

The level of ESR is related to the capacity, voltage, frequency and temperature of capacitor. The lower the ESR requirement, the better. When the rated voltage is fixed, the larger the capacity, the lower the ESR. When the capacity is fixed, the ESR can be reduced by selecting high rated voltage. ESR is high at low frequency, low at high frequency, and increases at high temperature.

Leakage current

The smaller the leakage current, the better! The higher the capacitor capacity is, the greater the leakage current will be; reducing the working voltage can reduce the leakage current. Conversely, choosing a higher withstand voltage type will also help to reduce leakage current. Combined with the above two parameters, it is a simple and feasible method to select high voltage withstand varieties under the same conditions; it can reduce internal resistance, reduce leakage current, reduce loss angle and increase life.

Ripple current Irac

Ripple current is a very important parameter for the filter circuit of stone machine. The higher the ripple current Irac is, the better. The higher the frequency, the larger the Irac, and the lower the frequency, the smaller the Irac. According to the traditional view, we need to be able to have a high ripple current at low frequency, in order to obtain good high current discharge characteristics, make the low frequency more solid and full of elasticity, as well as good control and driving characteristics. In fact, at high frequencies, a high ripple current is also very helpful to the positive aspect of the timbre, which can make the high frequency have better extension and reduce the roughness.