Why Does The Inverter Interfere?

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Why Does The Inverter Interfere?

Views: 0 Author: Site Editor Publish Time: 2025-04-24 Origin: Site

Inverters can cause interferencedue to the switching components they use.Inverted is used to change the frequency. The inverter consists of rectifier circuits and inverter circuits. The input AC is converted to DC voltage through rectifier circuits and wave circuits. The DC voltage is then converted to pulse voltage of different widths through the inverter called pulse width modulation voltage. The essence of PMW is to use this PWM voltage to drive the motor to adjust the torque and speed of the motor. This working principle causes the following three types of electromagnetic interference.

Inverter generating electromagnetic interference (EMI) that can affect nearby electronic devices and even the inverter's own control circuit. This interference can manifest as noise in radios, flickering lights, or disruptions to internet connections.

1. Electromagnetic Interference (EMI):

High-Frequency Switching RF transmission interference:

Since the load voltage is pulsed, the conversion from the grid is also pulsed from the grid. This pulsed current contains a large amount of high-frequency components. RF interference is formed.

Inverters use switching devices to convert DC power to AC power, and these rapid on/off cycles generate high-frequency electromagnetic noise.
RF radiation interference:

RF radiation interference comes from the input cable and output cable of the inverter power supply. When there is RF interference current on the input and output cable of the inverter power supply, because the cable is equivalent to the antenna, electromagnetic wave radiation is inevitably generated, and radiative interference is generated. The PWM voltage transmitted on the inverter output cable also contains a rich high-frequency component, which will generate electromagnetic wave radiation, forming radiative interference and interfering with other electronic equipment.
Harmonic Interference:

The rectifier circuit of inverter generates a harmonic current. This harmonic current generates a voltage drop on the impedance of the power system, resulting in a voltage waveform distortion. Many devices are interfered with by this distortion voltage or cause overheating.

2. Solutions to Inverter Interference:

EMI Filters:

Installing EMI filters on the input and output of the inverter can help block or reduce unwanted high-frequency noise.
Shielding:

Shielding sensitive electronic components or devices with metal enclosures or conductive coatings can prevent EMI from affecting them.
Proper Grounding:

Ensuring proper grounding of the inverter and its components is crucial for minimizing EMI.
Distance:

Maintaining sufficient distance between the inverter and other sensitive electronic devices can also help reduce interference.
Software Solutions:

In some cases, software-based anti-interference measures can be implemented.
Separate Power Sources:

Providing separate, isolated power sources for the inverter's control circuits can prevent interference from the power stage.
Professional Installation:

Proper installation by qualified professionals can minimize potential interference issues.

Why Does The Inverter Interfere

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