4A 10A 20A AC 110V 220V Power Amplifier Audio Power Filter EMI Electromagnetic Interference Current Equipment EMC

SIZE : 118X50X30MM Weight: about 160G

Name: Audio power amplifier EMI power filter

Input voltage: single-phase AC 110--250V

Output voltage: single-phase AC 110--25ov

Load rated current: 4A--20A

Input port: three-wire 7.62 socket input

Output port: two-wire 7.62 socket output

design feature:

A: The first stage is the RFI filter DC circuit. Through two 50A bridge stacks and four 35V2200UF capacitors, the DC component in the AC power supply is filtered, and the humming sound is suppressed due to the magnetic saturation or the increase of the static current caused by the DC component transformer.

B: Differential mode filtering, two differential mode inductors, differential mode filtering for AC power supply, suppressing medium and high frequency interference

C: One-stage common mode filtering, which is combined into common mode filtering through X2 capacitor and common mode inductor.

D: Two-stage common-mode filtering, because two-stage (also known as two-stage) filtering is used, the effect of filtering out noise is better. It can suppress the problem of fast transient group pulse interference with a repetition frequency of several kilohertz in some user sites.

Main parts selection:

X2 capacitor: Germany Siemens 0.22UF 3PCS

Y2 capacitor: 275V 330OPF 2PCS

DC elimination capacitor: 35V 2200UF 4PCS diameter 16MM

DC elimination bridge stack: 50A 1000V 2PCS

Differential Mode Inductor: 47UH 2PCS

Common Mode Inductance: 2 PCS

Resistor: 1 PCS

Socket: 7.62 2PIN 3PIN each 1PCS

PT-0007 power amplifier audio power filter circuit introduction: The circuit consists of three parts, the first part is the RFI DC blocking circuit, the second part is the differential mode EMI filter, and the third part is the common mode electromagnetic interference filter circuit.

1. RFI DC blocking circuit: Eliminate the interference of the DC component of the AC AC220V mains power to the AC power due to the DC component of the inverter air conditioner, switching power supply, refrigerator, charger and other household appliances. The RFI DC blocking circuit built with diodes and capacitors eliminates and blocks the DC components in the mains AC power supply to prevent the transformer from magnetic saturation or increased quiescent current due to DC components.

NOTE: Any DC current on the AC mains will generally cause humming in most large toroidal transformer coils, adding an RFI DC blocking circuit can significantly improve power quality, eliminating and suppressing transformer humming.

2. Three-stage composite type (1-stage differential mode + 2-stage common mode) EMI electromagnetic interference filter circuit, due to the use of three-stage (also known as three-section) filtering, the effect of filtering noise is better. It can suppress the problem of fast transient group pulse interference with a repetition frequency of several kilohertz in some user sites.

This module is used in conjunction with a decoder or a power amplifier to filter the DC component of the power supply, eliminate and suppress the hum of the transformer, the high-frequency noise in the power supply, purify the power supply, and can significantly improve the sound quality of the power amplifier, enhance the resolution and make the background quiet.

The input GND needs to be connected to the ground wire of the power line, and can also be connected to the case shell, depending on the specific situation.