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Capacitance step-down principle

by:SMiLer     2022-01-09
The working principle of capacitance step-down principle of capacitance step-down is not complicated. He works by using capacitors in a ac signal frequency of capacitive reactance to limit the maximum working current. For example, under the condition of power frequency of 50 hz, a 1 uf capacitance of capacitive reactance is about 3180 ohms. When the ac voltage of 220 v in the ends of the capacitor, is through the capacitance of the maximum current is about 70 ma. Although through the capacitance current of 70 ma, but on the capacitor does not produce power consumption, because if the capacitor is an ideal capacitor, the imaginary part of current through the capacitor current, it did work for reactive power. According to this characteristic, if we again on a 1 uf capacitor in series a resistance element, the impedance components at both ends of the voltage and the power produced by it all depends on the characteristics of the impedance components. We will, for example, a 110 v / 8 w bulb with a 1 uf capacitor in series, in 220 v / 50 hz ac voltage, the light bulb lit up, sends out the brightness of the normal without being burned. Because 110 v / 8 w bulb needed current for 8 w / 110 v = 72 ma, it produced with 1 uf capacitance current limiting characteristics are identical with each other. In the same way, we can also use 5 w / 65 v bulbs and 1 uf capacitance in series with the received 220 v / 50 hz alternating current (ac), the light bulb will also lit up, but not destroyed. Because 5 w / 65 v light bulb working current is 70 ma. Therefore, the capacitance step-down flow is actually using the capacitive reactance. In fact have a limited current and capacitor and dynamically allocated capacitors and load voltage on both ends. Using capacitance step-down should pay attention to the following: 1 according to the size of load current and the work frequency of the alternating current (ac) to select the appropriate capacity, rather than on the basis of the load voltage and power. 2 current limiting capacitance must adopt non-polar capacitor, electrolytic capacitor will not be used absolutely. And capacitance pressure must be above 400 v. The most ideal capacitance for iron shell oil immersion. 3 capacitance step-down cannot be used for high power condition, because not be safe. 4 capacitor step-down is not suitable for dynamic load conditions. 5, same capacitance step-down discomfort might sex and perceptual load. 6 when need dc work, try to use half-wave rectifier. Bridge rectifier is not recommended. And want to meet the constant load conditions.
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