In demanding circuits, CBB capacitor
s replace common polyphenyl or mica capacitors. This is mainly because the CBB capacitor has an advantage in volume compared with the polyphenyl capacitor, and can achieve the same performance with a smaller size. However, in the use of CBB capacitors, there will also be application scenarios for MPK capacitors. But for many novices, it is not easy to distinguish the difference between the two types of capacitors and their usage. This article will focus on this and introduce the difference and usage of CBB22 capacitors and MPK capacitors. 1. The difference in performance between MPK capacitor and CBB capacitor The main difference between MKP capacitor and CBB22 lies in the way of outsourcing. The box-type structure of MKP capacitors has better flame-retardant performance and sealing performance, but the current CBB basically adopts the impregnation type, and the sealing problem is solved. The internal electrical performance structure of the CBB series is that some manufacturers use aluminum film for production, and some use zinc aluminum film for production. The electrical performance of the zinc-aluminum film production is similar to that of MKP capacitors. It is characterized by strong ability to withstand DC voltage. The characteristics of the aluminum film structure product is that the loss is smaller than that of the zinc aluminum film, and the high frequency AC withstand voltage is strong, but the DC withstand voltage is not as good as the zinc aluminum film. The difference in usage CBB is lower in cost than MKP, and in many places (almost all places), it can replace MKP in terms of electrical performance under the condition of meeting the actual DC withstand voltage. If the upper and lower output powers of the half-bridge circuit are 0.47UF, the power can be approximately regarded as 0 under the DC state. The AC power is very simple and can be calculated, Pu003dU*U/XCu003dU*U/(1/2πfC) where U is the effective value of the AC voltage, XC is the capacitive reactance f is the frequency corresponding to the AC voltage U, and C is capacity. As for the power that various capacitors with different capacities can withstand, refer to the AC voltage and frequency shown in the figure below and calculate according to the above formula. 2. The difference between MPK capacitor and CBB capacitor in use MKP capacitor is mainly used for EMI incoming line filtering, CBB capacitor is mainly used for oscillation, coupling, resistance-capacitance step-down and other circuits; CBB is lower in cost than MKP, and its electrical performance is satisfactory. It can replace MKP under the condition of DC withstand voltage. The nominal rated voltage of MKP capacitors is 250/275VAC (x2), but its DC withstand voltage must reach 2000VDC2S; the withstand voltage standard of CBB capacitors is only 1.6 times the rated voltage and so on. 3. There is another problem with the frequency difference between MPK capacitor and CBB capacitor, which is the frequency problem. The MKP capacitor of the induction cooker is marked with a frequency (50KHZ). It is found that this capacitor is used in electromagnetic induction half-point bridge circuits. And the price is much more expensive than using CBB22, but the capacitance of using CBB22 is much larger than using MKP capacitor 0.47UF. If there are two MKP0.47 (50KHZ) up and down for 3000W power output, and two CBB22 up and down (3.3UF each) for 3000W, which of these two methods is reasonable? The key to power output is to look at The AC voltage (mainly AC component), DC voltage, and frequency on the capacitor are determined by the level. The concepts of the operating power on the capacitor and the load power should not be confused, and cannot be generalized to one power alone. For the frequency problem, many signs are 50~60Hz, but it can also be used at 20~60KHz. Some circuits are higher. The difference is that the AC voltage withstands under different frequency conditions is mainly determined by the power on the capacitor not to exceed standard value. If the power of the working capacitor (MKP61 and CBB22) is 3000W, the capacitor itself heats up very much, and the iron-made capacitors (MKP61 and CBB22) will be broken. 4. The difference between the selection of MPK capacitor and CBB capacitor. When selecting and distinguishing CBB22 capacitor and MKP61 capacitor, attention should be paid to the insulation performance of the capacitor. MKP61 and CBB22 capacitors use polypropylene film dielectric, which has low loss and low self-heating. In actual use The temperature rise in the circuit should not exceed 6°C (above the ambient temperature). After actual testing, many circuit boards have temperature rises within 4°C. If the temperature rises above this condition, it indicates that the operating power of the capacitor itself is too large, and both types of capacitors are more likely to fail. Because MKP61 capacitor uses flame-retardant shell and potting material, its thermal insulation performance and heat dissipation performance are better than CBB22. If the capacitor is located close to the power transistor or other heating elements, it is safer to use MKP61. If it is far away from the heat source, use CBB22 more economics. Through experiments, it is found that the capacitor is close to the power transistor (the temperature on the heat sink exceeds 115℃ after the transistor heats up), the use of CBB22 capacitor is easy to fail, and the use of MKP61 is safer. When we increase the distance between the capacitor and the power transistor (heat source), there is no significant difference between the capacitance of CBB22 and MKP61. Formula explanation Pu003dU*U/XCu003dU*U/(1/2πfC)u003dU*U*2*π*f*CU is the effective value of AC voltage in 'volt'; XC is capacitive reactance, in ohm; The value of π in 2πfC is 3.14; f is the frequency of the AC voltage and its unit is Hertz; C is the capacitance and the unit is Farad (pay attention to the unit conversion when calculating). Example calculation VDE certification requires that the MKP61-275VAC-105 (1μF) capacitor withstand AC withstand voltage of 1500V (50HZ) and its power calculation: Pu003d1500×1500×2×3.14×50×1×0.000001u003d706.5 watts. In an experiment, the power of CBB22-400V-104 was calculated under the conditions of 40KHZ and 60VAC: u003d60×60×2×3.14×40×1000×0.1×0.000001u003d90W The distinction and usage of MPK capacitors are explained in some aspects, and the formulas are given to cooperate with examples to help you further understand the differences between these two types of capacitors. I believe that through the introduction of this article, friends who are more obscure about the distinction between these two capacitors should be able to get a clear answer.
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