Kuidas peaks filter kondensaator olema valitud õigesti millal projekteerimine a lülitamine toide toide?
The switching power supply depends heavily on the filter capacitor. Every engineer and technician is extremely concerned with the issue of how to choose the filter capacitor appropriately, especially the selection of the output filter capacitor. We can observe different capacitors on the power filter circuit, with capacitance values of 100uF, 10uF, 100nF, and 10nF, respectively. How are these parameters determined? Please refrain from accusing me of stealing another person's schematic diagram.
The pulsating voltage frequency for typical electrolytic capacitors used in 50Hz power frequency circuits is only 100Hz, and the charging and discharging period is on the order of milliseconds. The necessary capacitance can reach hundreds of thousands of F in order to get a lower pulsation coefficient. In order to improve capacitance, standard low-frequency aluminum electrolytic capacitors are designed. the primary pros and disadvantages criteria.However, the switching power supply's output filter electrolytic capacitor has a sawtooth wave voltage frequency that can reach tens of kHz or even MHz. Capacitance isn't the primary indicator right now. A lower equivalent impedance within the operating frequency of the switching power supply is required, as well as a good filtering effect on the high-frequency spikes generated when the semiconductor device is operating. These characteristics are the benchmark for evaluating the quality of high-frequency aluminum electrolytic capacitors.
Switching power supply cannot be used because standard low-frequency electrolytic capacitors cannot operate above about 10 kHz before they start to exhibit inductivity. The switching power supply's high-frequency aluminum electrolytic capacitor has four connections. The capacitor's positive electrode is made up of the two ends of the positive aluminum sheet, while its negative electrode is made up of the two ends of the negative aluminum sheet.
In a four-terminal kondensaator, current enters from one positive terminal, travels through the capenitor's interior, and then exits from other positive terminal to the load. when return from the load, current enters from one negative terminal of the capdenator, travels through the capdenitor's interior, and then exits from other negative terminal to the power supply's negative terminal.
The four-terminal capacitor offers a very advantageous method for minimizing the pulsing component of the voltage and suppressing the switching spike noise since it has strong high-frequency properties. The aluminum foil is cut into several smaller portions, and several leads are linked in parallel to lower the impedance component in the capacitive reactance, which is another form of high-frequency aluminum electrolytic capacitor. Additionally, the capacitor's capacity to handle heavy currents is increased by using low-resistivity materials as lead-out terminals.
toide toide peab olema "clean" and energia täiendamine peab olema õigeaegne digitaalne vooluringid to run pidevalt ja töökindlalt, mis tähendab et filtreerimine ja lahtisidumine peab olema efektiivne. lihtsalt väljendatud, filtreerimine ja lahtisidumine on meetodid energia salvestamine nii et energia saab olla kiiresti täiendatud millal kiip vajab voolu. Don't you dare tell me that DCDC and LDO are not in charge of this? Yes, they can manage it at low frequencies, but high-speed digital systems work differently.
