Į Priežastys Harmoninis Generacija Perjungimas Maitinimas Šaltiniai
In moderni elektroninė įranga, perjungimas galia tiekimas is a plačiai naudojama forma of power supply, which has the characteristics of small size and high efficiency. Tačiau, switching power supplies can also generate harmonics, which to some extent affect the quality of the power supply and the stability of the power grid, and even pose a threat to circuits and devices. Todėl, it is imperative to solve the harmonic problem iš perjungimas maitinimas šaltinis.
Harmonika referent į an elektrinė bangos forma su a aukštesniu dažniu nei the fundamental wave, paprastai origining from factors such as nonlinear loads, non sinusoidal voltage, and electromagnetic interference. The working principle of a switching power supply determines its susceptability to harmonic generation.
1. Trumpasis jungimas efektas kondensatorius filtravimas grandinė
In switching power supplies, the capacitor filtering circuit most plays a role in reduce the pulsating voltage on the power output, but under high-frequency conditions, kondensatoriai are also a type of short circuit. Short circuits can cause harmonic currents to flow into the power supply, causeing oscillations in the conductor and causing noise and thermal effects.
2. Rezonansas efektas of induktyvumas filtravimas grandinė
In switching power sources, the inductance filtering circuit is most used to prevent high-frequency fluctuations in the output of the power supply. When the load current is very low, the inductance is in a rezonansas state, which will generate high-frequency harmonic currents. The high-frequency harmonic current generated will cause resonance in the power capacitor and line inductance, cause high-frequency oscillation when the current teka per.
3. Rezonansas efektas of induktyvumas grįžtamasis ryšys grandinė
Rezonansas grįžtamasis ryšys grandinė is an svarbu našumas charakteristika išjungimas galia tiekimas, kuris nuolat monitoriai apkrova apkrova ir galia tiekimas sąlygos per a grįžtamasis ryšys valdiklis, in order to sureguliuoti the power output in a timely manner and improve the efficiency of the wholere circuit. Tačiau, the inductance feedback circuit reduce the output voltage of the power supply through a resonant circuit, increasing the generation of harmoninės srovės.
4. Poveikis darbas dažnis
Aukštesnysis the operuojantis dažnis of a switching power supply, the higher the harmonics, and the more abundant the harmonic currents generated. And high-frequency current will generate relate large electromagnetic waves on the coil, which will also lead to the phenomenon of mutual influence between the electric appliance self and the electromagnetic waves filled with air.
