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Technological innovation
HOTLine：0769-2268 1472
Capacitor (capacitor) is widely used in audio components, the filtering, anti-cross-linked, high-frequency compensation, current feedback ... everywhere. But Zoe function and manufacturing materials, manufacturing method of subdivision, it is not an overnight can be a little understand. So narrow the scope of this article talk about electrolytic capacitors, and talk about the power smoothing aluminum electrolytic capacitors used.
Each machine must eat sound power ─ in addition to passive preamp, since the required power supply, then ultimately "filter" this action. Do not fight with me, of course, no need to use battery-powered power supply smoothing filter. But the battery charging circuit is also rectified and filtered, so the filter capacitor will still exist.
We are now learning to use filter capacitor, the official name should be: aluminum dry electrolytic capacitors. On my observation, except Canada Sonic Frontiers vacuum tube preamp, he had the choice of high-voltage regulator circuit PP plastic filter capacitor do, the other for all other models use aluminum dry electrolytic capacitors; therefore it is necessary to do more to understand users .
Faced with the power regulator circuit as power supply smoothing capacitor, your first thought would be-what? ─ capacity? Pressure? On the capacitor sheath, we must have the capacity indicated, it refers to the capacitance; there must also withstand mark, it refers to the operating voltage or rated voltage.
Operating voltage (working voltage) referred WV, is absolutely safe value; if surge voltage (referred to as the SV or Vs), is the surge voltage or breakdown voltage; beyond this voltage capacitance value ensures that this will drown the waves ─ careful capacitance Explosion! According to international IEC 384-4 regulations, when less than 315V, Vs = 1.15 × Vr, is higher than 315V, Vs = 1.1 × Vr. Vs is the surge voltage, Vr is the rated voltage (rated voltage).
Charge energy of the capacitor is Q = CV to represent, Q is the Coulomb, C is the capacitance, V is the voltage; it is constant when the voltage value, the electrostatic capacity can be increased to increase the charge of energy. Please note that the capacity of the capacitor units should be F (farad), but due to the low value of the measurement result is too high, it is more use μF, 1F = one million μF. Useful mF abroad expressed μF, mF actually not very appropriate, but not μ key on a mechanical typewriter, so with m represents micro.
With electrostatic capacity and working pressure two parameters, if you are buying capacitors, then you will consider Shiyao? Intuition is a price on. Ah, this parameter is very important, but also lower the better value. It was first thought of the brand, and adhere to Japanese goods and killed without ─ also existed complex eight-year war? American goods are only ranked second, Sweden or Germany to manufacture the first row. Ah, this parameter is also very important. But since it comes to brands, it can not ignore the series model; because a factory can produce many different series of products, the series is different, the quality and the price will be different. OK, let's tidy up the parameters related to the power of the smoothing capacitor are known: capacitance, rated voltage, the surge breakdown voltage, price, brand, model series.
Should not only kitten twenty-three, dimensions should also be very important, because there is the weight associated with it and pin patterns, snap-in is a PC plug weld plate, screw the lock screw type. As for weight, the same capacity with the pressure, but the two brands compare different capacitance, the weight must be different; the dimensions are more concerned with the chassis planning. Some capacitors are not all round, a bit like a polygonal, Philips, BHC have this seem very advanced series. Now we tidy up, plus the weight, dimensions, pin patterns ─ has nine parameters.
Skin color Who put forward Very wonderful. Because white, black, blue plastic packaging manufacturers have used, it sometimes has some significance, such as the sundial black gold for audio sound often representative of the High-level capacitance. Appearance alone can think what? Manufacturing date, 9627 is the first 27 weeks of 1996 the factory; in recent years seems to have come of day capacitance deliberately omitted manufacture date indicated. But skin color and text printing is not directly related with the quality, it is only the date of manufacture plus parameters. Also, do not forget to apply to operating temperature as 105 degrees C to 85 degrees C is more suitable for vacuum tube machine. If the machine you want to put in the Antarctic, the best selection of minus 55 degrees C resistant varieties.
Capacity errors do not miss, when taken multiple satellites in parallel, to obtain single uniform characteristics, the error is certainly lower the better. Now coupled with the operating temperature and the capacity error, we hand has 12 parameters, the capacitor should Sancheng more understanding.
Please do not get me wrong, the capacitor operating temperature does not refer to the environment or the surface temperature of a few degrees ─ regardless of the package is the same plastic sheath, it refers to the operating temperature of aluminum foil, so tubing machine selects 85 degrees C variety is absolutely OK, as long as the away from the tube capacitor Aberdeen certainly safe.
But several important parameters related to capacitors real quality, but there is only the original specifications book will not reveal the skin in the finished package, and talk about these important parameters are the focus of this article.
Dissipation factor ─ loss angleDissipation factor dissipation factor (DF) is present in all capacitors, sometimes DF values represent the loss angle tanδ. Think, loss angle, both losses, of course, the lower the better. Loss angle plastic capacitance is very low, but aluminum electrolytic capacitor is quite high. DF value is high or low, it is the same brand, same series capacitors, the temperature, capacity, voltage, frequency ...... have a relationship; when the capacity is the same, the more the pressure, the higher the DF values low. Give examples do illustrate, with 10000μF capacitance, DF value of the voltage of 80V label must be better than the same series of low voltage 63V. The choice of filter capacitor Articles often find higher pressure who, not without reason. Besides the higher the temperature the higher DF value, the higher the frequency DF values also higher.
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