What is the rectification stage process of power inverter

The rectification stage of the Power Inverter is the process of converting the input direct current power (DC) into pulsating DC power. This stage uses a rectifier bridge circuit, which consists of four switching devices, usually transistors.

Rectifier Bridge Circuit:

The rectifier bridge circuit is the core component of the Power Inverter rectification stage. It usually uses four electronic switching devices distributed in a bridge circuit. The four switching devices are divided into two pairs, each pair including a conducting transistor and a conducting diode. These two pairs are connected to the positive and negative poles of the DC power supply respectively, allowing the rectifier bridge circuit to perform full-wave rectification of the input DC power.

Conduction and Cutoff Process:

The transistors and diodes in the rectifier bridge circuit alternately turn on and off, depending on the polarity of the input DC power. During the positive half-cycle, one pair of transistors and diodes is on while the other pair is off. During the negative half cycle, the on and off conditions are interchanged. This results in both half-cycles of the DC current being rectified by the rectifier bridge circuit.

Output Voltage Formation:

Through the rectifier bridge circuit, the input DC power forms a pulsating DC power at the output end. This is because during the on period, current is able to flow to the load, while during the off period, the current is blocked. As a result, the output voltage takes on the shape of a pulse, the amplitude of which depends on the voltage of the DC supply.

Filtering Capacitor:

In order to reduce the pulsating component of the output voltage, a filter capacitor is usually added to the rectified DC circuit. This capacitor smoothes the current, reduces ripple, and improves output voltage stability. The capacitance and voltage level of the filter capacitor are selected according to the application requirements.

Current and Voltage Waveform Analysis:

During the rectification stage, engineers perform detailed analysis of current and voltage waveforms. This includes observing the rectified output current and voltage waveforms to ensure they meet design requirements. The analysis also includes consideration of parameters such as power factor and harmonic content to ensure that the rectification stage is stable and controllable for subsequent inverter stage operations.