Power inverter is a tool for DC and AC conversion, which is widely used in production and life, especially in power industry. Through the conversion of power inverter, it is convenient to use electrical appliances without being limited by the nature of power supply. In general, it may be difficult for you to understand what power inverter is. Let's take a look at the working principle of power inverter.
Power inverter
1、 What is power inverter
The power inverter (on-board power supply) is a convenient power converter that can convert DC12V DC power into AC220V AC power which is the same as the mains power for general electrical appliances. The power inverter automatically realizes the battery protection function by the internal electronic circuit. The power inverter is not only applicable to on-board systems, but also can be used to convert DC12V to AC220V AC whenever there is DC12V power supply,
2、 Working principle of power inverter
Working principle of inverter: it is roughly a process of converting a low-voltage DC to a high-voltage AC
First of all, the DC voltage is divided into two circuits, which generate a KHZ-level control signal for the power supply of the front stage IC, and the control signal is sent to the front stage power tube, which drives the power tube to switch continuously, The primary stage of the high frequency transformer generates low voltage high frequency alternating current (although the current voltage is low, the frequency is quite high. The purpose is to make the latter stage of the transformer produce a high voltage. The frequency of the former stage is proportional to the output voltage of the latter stage, and of course, it is also within the frequency range that the power tube can bear). The high frequency alternating current is output through the high frequency transformer, and is rectified by the fast recovery diode full-bridge rectifier, Output a high frequency hundreds of V DC power to the rear power tube. Then, the post-stage IC generates a control signal of about 50HZ to control the operation of the post-stage power tube, and then outputs 220V50HZ alternating current.
Of course, a complete inverter also needs some protection circuits, such as overload protection, temperature protection, high and low input voltage protection and filter circuit. The filtering in the high-frequency circuit is also very important, because the high-frequency is easy to produce some interference and parasitic coupling, so the filtering circuit is needed to filter out the influence of these factors to increase the stability of the circuit.
In short, the CPU microprocessor realizes the PWM pulse, and changes the low voltage from 12V to about 300V DC voltage through the high-frequency transformer. Then the CPU outputs 50 Hz AC drive signal to drive the power switch to work. Through the successive conduction conversion of the power tube, the AC voltage with the average effective value of 220V in the form of square wave is realized.
Through the small editor's explanation, did you understand what the power inverter is and the working principle of the power inverter? The editor's level is limited, and he is not a junior college student. This explanation is also for sale now. If there is anything wrong, please explain it in detail. If your friends need to know more about power inverters, you might as well find some professional books to learn.
电源逆变器是进行直流电和交流电转换的工具，在生产生活中，尤其是电力行业有着广泛应用。通过电源逆变器的转换，可以方便地使用电器而不受电源性质的限制。只凭泛泛的讲，大家也许还是很难明白什么是电源逆变器，那就来看看电源逆变器的工作原理吧。
一、什么是电源逆变器
电源逆变器(车载电源)是一种能够将DC12V直流电转换为和市电相同的AC220V交流电，供一般电器使用，是一种方便的电源转换器。电源逆变器是靠内部设置的电子电路，自动实现电池保护功能的。电源逆变器不仅适用于车载系统，只要有DC12V电源的场合，都可使用电源逆变器，将DC12V转换为AC220V交流电，
二、电源逆变器工作原理
逆变器的工作原理：大致是一个低压直流转换为一个高压交流的过程
首先直流电压分两路，给前级IC供电产生一个KHZ级的控制信号，一路到前级功率管，控制信号推动功率管不断开关，高频变压器初级产生低压的高频交流电(此时的交流电虽然电压低，但是频率相当高，目的就是为了能让变压器后级产生一个高的电压，前级的频率和后级输出的电压成正比，当然也要在功率管所能承受的频率范围) 通过高频变压器输出高频交流电，经过快速恢复二极管全桥整流，输出一个高频的几百V直流电到后级功率管。然后再由后级IC产生50HZ左右的控制信号，来控制后级的功率管工作，然后输出220V50HZ的交流电。
当然一个完整的逆变器还需要一些保护电路，比如过载保护、温度保护、高低输入电压保护和滤波电路。高频电路里的滤波也相当重要，因为高频容易产生一些干扰和寄生耦合，所以需要滤波电路来滤除这些因素的影响，来增加电路的稳定性。
简单地说，就是由CPU微处理器实现PWM脉冲，通过高频变压器将低电压12V变为300V左右的直流电压。然后由CPU输出50赫兹交流驱动信号，驱动功率开关工作。通过功率管的先后导通转换，实现输出方波形式的平均有效值220V的交流电压。
通过小编的一番讲解，大家是不是明白了什么是电源逆变器，弄清楚了电源逆变器的工作原理？小编的水平的有限，也不是专科出身，这番讲解也是现学现卖，如有不妥之处还请详解。如果朋友们需要深入了解电源逆变器，不妨找一些专业书籍进行学习。