FI series 1-6kw low frequency inverter
Power filter adaptation principle
There are two types of filter circuits commonly used in power supply filters: passive filtering and active filtering. The main forms of passive filtering are capacitive filtering, inductive filtering and complex filtering (including inverted L type, LC filter, LCπ type filter and RCπ type filter, etc.). The main form of active filtering is active RC filtering, also known as electronic filters. The magnitude of the pulsation component in the direct current is represented by the pulsation coefficient S. The larger this value is, the worse the filtering effect of the filter is.
Ripple coefficient (S) = the maximum value of the fundamental wave of the AC component of the output voltage / the DC component of the output voltage
The principle of the power filter is an impedance adaptation network: the greater the impedance adaptation between the input and output sides of the power filter and the power and load sides, the more effective the attenuation of electromagnetic interference.
The specific working principle is as follows: after the alternating current is rectified by the diode, the direction is single, but the magnitude (current intensity) is still constantly changing. This kind of pulsating DC is generally not directly used to power the radio equipment. To turn the pulsating DC into a DC with a smooth waveform, it is necessary to do some more work of "filling and leveling", which is filtering. In other words, the task of filtering is to reduce the fluctuation component in the output voltage of the rectifier as much as possible, and transform it into a near-steady DC current.
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