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Safety capacitance can don't

by:SMiLer     2021-02-28
Safety capacitance can don't, please don't safety capacitance in the power circuit? First of all, we should first safety capacitance is what, what is the role. Safety capacitance means used in such situations, the capacitor after failure, will not lead to electric shock, do not endanger personal safety. Also called safety capacitance. Safety each Y capacitance of the capacitors including X of two types, capacitance is two line jumper in the power line (X L - N) The capacitance between, generally choose metal film capacitors; Y capacitor are respectively jumper in the power line between line and ground ( L - E, N - E) Capacitance, usually come in pairs. Based on the limitation of leakage current, capacitance value Y cannot too big, general level X capacitor is uF, Y capacitor is nF level. Capacitance differential mode interference suppression X, Y capacitor common-mode interference suppression. Safety capacitance discharge and capacitors, capacitors in the external power after disconnecting the charge will be kept for a long time, if touch will be electric, and safety capacitance is not the problem. For safety and EMC consideration, general advice plus the entrance of the power supply safety capacitance. In the ac power input, generally need to increase the three security capacitance to suppress the EMI conducted interference. They are used in power supply filter, power filtering effect, respectively for common mode, differential mode interference filter. Y capacitance in addition to conform to the corresponding grid voltage withstand voltage, also claim the capacitor in the electrical and mechanical properties have enough safety margin, avoid short-circuit phenomenon under extreme environmental conditions appear breakdown, Y capacitance pressure performance is of great significance for protecting the personal safety. With the rapid development of China's economy, people's living standards continue to improve, electronic products a lot into the family, because these devices to get an electric shock, fire, harmful radiation, chemical, explosion, and the risk of mechanical injury, in order to protect the user's life and property safety, safeguard consumer interests, promote the enterprises to improve product quality, must choose the safety of security in the power circuit capacitance. Safety capacitance step-down principle safety capacitance step-down principle of work is not complicated. Is the use of capacitance in the ac signal frequency must be produced to limit the maximum working current capacitive reactance. 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, safety 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 step-down should pay attention to the following: 1: according to the size of the current load 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. Three: safety capacitance step-down cannot be used for high power condition, because not safe. Four: safety capacitance step-down is not suitable for dynamic load conditions. 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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