SCR インバーターの仕組み?

SCR inverters mainly comprise SCR devices, 絶縁変圧器, フィルター, 等. その中で, SCRデバイスはコア部分です. It is a semiconductor device with self-turnoff capability and can control on and off by controlling the voltage of the gate. The function of the isolation transformer is to isolate the input power supply from the output power supply to ensure safety and improve efficiency. The filter filters out the harmonic components in the output voltage to ensure the stability and quality of the output voltage.

Working principle of SCR inverter

The working principle of the SCR inverter is based on PWM (Pulse Width Modulation) control technology. Precisely, by controlling the trigger pulse width of the SCR device, the SCR conduction time is controlled, thereby controlling the size and frequency of the output voltage.

1)Generation of trigger pulse: The trigger pulse of the SCR inverter is generated by the PWM controller. The PWM controller controls the trigger pulse width of the SCR according to the amplitude and frequency of the input signal, as well as the preset pulse width.

2)SCR turn-on and turn-off: When the PWM controller generates a trigger pulse, the SCR device will turn on, allowing current to pass. When the trigger pulse ends, the SCR device turns off, and the current cannot pass. By controlling the width of the trigger pulse, the conduction time of the SCR can be controlled, thereby controlling the size and frequency of the output voltage.

3)Output filtering: Since the output voltage of the SCR inverter contains harmonic components, a filter needs to be used for filtering. The filter generally uses an LC filter, composed of an inductor and a capacitor, which can effectively filter out harmonic components and ensure the stability and quality of the output voltage.

Advantages of SCR inverter

1)High efficiency and energy saving: SCR inverter has high conversion efficiency, generally above 95%. This allows it to achieve energy conversion at lower losses, significantly reducing energy waste.

2)Stable and reliable: SCR inverter has stable output performance and can maintain output stability even when the load changes. 加えて, due to its reliable performance and structure, it has a long service life and low maintenance costs.

3)Complete protection functions: The SCR inverter has complete protection functions, including over-current protection, over-voltage protection, under-voltage protection, 等. These protection functions can effectively protect the safety of the inverter and load and extend the service life of the equipment.

Application of SCR inverter

Due to the above advantages, SCR inverters are widely used in many fields. 例えば, in the power system, it can be used in UPS (uninterruptible power supply), SVG (static var compensation device), 等; in the new energy field, it can be used in wind power generation, photovoltaic power generation, 等; in the industrial field, it can be used for motor drive, frequency conversion speed regulation, 等.

Development

As an essential part of power electronics technology, SCR inverter has the advantages of high efficiency, 安定性, flexibility and reliability. Understanding their working principles and advantages allows for better design and use of power electronic equipment. パワーエレクトロニクス技術の継続的な発展により、, SCR inverters will be applied and developed in more fields.

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