How to judge the quality of power filters, these 3 methods are worth a try!

Power filters Power filter plays a vital role in electronic devices. It can effectively filter out high-frequency noise and electromagnetic interference in the power line to ensure stable operation and extend the service life of electronic equipment. However, there are many types of power filters on the market, and the quality varies. How to judge […]

Read More

Theoretical analysis of digital filter. 1 accurate article make it clear!

Digital filter play a role in filtering the input signal. If the input and output of the filter are both discrete-time signals, then the impulse response h(n) of the filter must also be discrete. Such filters are digital filters. When implementing a digital filter in hardware, the required components are delays, multipliers, and adders. If […]

Read More

Filters: 1 Comprehensive Introduction Article

This article originally appeared on Network World and was written by IDG staff writer Brent Dietz. Filter This Few people will think about the filter before servicing their car for 50,000 kilometers. Look at the items listed on the maintenance invoice, including air filter, oil filter, fuel filter, cabin air filter, transmission filter… Oh my […]

Read More

The structure and design basis of LLCL filter

The structure of the LLCL filter The LLCL filter is a higher order filter. Its principle is to replace the capacitor C1 in the LCL filter with an LC resonant branch to achieve a better switching frequency harmonic filtering effect and reduce the volume. The inverter structure that adopts LLCL filter is shown as in Figure 1. […]

Read More

Design example of LCL filter

A calculation method of ripple current was given in the design of a single inductance filter in the previous article, and another method of calculation of ripple current will be introduced here. Also considering that the prototype adopts the unipolar SPWM strategy, the expression of the bridge arm output voltage Uinv is Among them, M is […]

Read More

The structure and design basis of LCL filter

The structure of the LCL filter The filtering capability of a single inductor is limited and the volume and loss are relatively large. However, the LCL type filter has the advantages of small size and low loss, and is widely used in grid-connected inverters. The grid-connected inverter structure using LCL filter is shown in Figure […]

Read More

Overview of the network filter and the parameter design of L filter

Overview of the network filter The PWM modulation of the grid inverter leads to a large number of switching frequency and its multiplier harmonic voltages in the output voltage of the bridge arm, and finally leads to corresponding harmonic currents in the grid current. However, in order to make the grid-connected inverter friendly to the […]

Read More