What is the working principle of the inverter module in bi-directional inverter charger

The inverter module is a key component in modern power electronics technology. Its internal complex circuit structure and precise control strategies jointly ensure efficient power conversion. This module is mainly composed of several core parts such as input filter circuit, DC bus, inverter bridge circuit, output filter circuit and control circuit. These parts cooperate with each other to achieve the efficient conversion of DC power to AC power.

After the electrical energy enters the inverter module from the input end, it is first pre-processed through the input filter circuit. The main function of this circuit is to eliminate ripple and noise in DC power supply to ensure the stability and purity of the input electrical energy. This process lays the foundation for subsequent inverter operations and ensures efficient operation of the system.

The filtered DC power enters the DC bus, which serves as the energy transmission channel of the inverter module, and the DC bus transmits the electrical energy to the inverter bridge circuit. The inverter bridge circuit is the core part of the power inverter and is usually composed of multiple switching devices, such as an insulated gate bipolar transistor (IGBT) or a metal oxide semiconductor field effect transistor (MOSFET). These switching devices, under the guidance of the control circuit, realize the conversion of electrical energy through precise control strategies.

Control circuits play a crucial role in the inverter process. It accurately controls the switching timing of the switching devices in the inverter bridge circuit based on the set inverter parameters (such as output voltage, frequency and waveform) and the real-time monitoring of the status of the power grid or electrical equipment. By adjusting the duty cycle and operating frequency of the switching device, the control circuit can achieve precise adjustment of the output AC power.

When the switching device operates on and off according to a preset control strategy, the inverter bridge circuit converts DC power into high-frequency AC power. However, the output AC power usually contains more high-frequency harmonics and noise, which cannot meet the needs of electrical equipment in many applications. Therefore, the output end of the inverter bridge circuit needs to be connected to an output filter circuit to effectively filter out high-frequency harmonics and noise, thereby ensuring that the output AC power is purer and more stable.

Output filtering circuits are usually composed of inductors and capacitors. Through reasonable design and layout, these components can effectively filter out high-frequency harmonics and noise, while maintaining the waveform and frequency of output AC power to meet the needs of electrical equipment. After processing of the output filter circuit, the inverter module finally provides high-quality AC power, which can stably supply the power grid or various electrical equipment to ensure its normal operation.