Nani? The principle of the inverter is like this~~~

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In daily life, we often use 220V AC to convert to DC power through the rectifier, and the inverter is an opposite transformation process, so it is called inverter . So, what is the principle of the inverter ? How does it work? The answer is in the text~~~

First, the principle of the inverter - - Introduction

Inverters, also known as converters, inverters, are just the opposite of rectifiers, an instrument that converts DC power to 220V AC. Can be divided into half-bridge inverters, full-bridge inverters, etc., is now widely used in computers, televisions, air conditioners, refrigerators, fans and other equipment.

Second, the inverter schematic

The inverter consists of inverter bridge, control logic and filter circuit. The schematic diagram is shown below, including input interface, voltage start loop, MOS switch tube, DC conversion loop, PWM controller, feedback loop, LC oscillation and output. Loop, load and other parts.

Third, the principle of the inverter

First, let's first take a look at what the various components of the inverter play.

1. Input interface: There are three interfaces in the input part, which input three signals of 12V DC voltage VIN, working enable voltage ENB and Panel current control DIM. Wherein VIN is provided by Adapter (Adapter); ENB is provided by MCU (microcontroller), its value is 0 or 3V, when ENB is 0V, it means that the inverter is not in normal working state, when ENB is 3V, it means inverter It is in normal working state; DIM is provided by the main board, and its value varies from 0 to 5V. The smaller the DIM value fed back to the PWM controller, the larger the current supplied by the inverter to the load.

2. Voltage start circuit: Receive work enable voltage ENB. When ENB is 3V, illuminate the backlight lamp of the panel, indicating that the inverter is in normal working condition.

3, PWM controller: Receive Panel current control DIM signal, complete overvoltage protection, undervoltage protection, short circuit protection, pulse width modulation and other functions.

4. DC conversion loop: It consists of MOS switch tube and energy storage inductor. When receiving 12V DC voltage VIN, the MOS tube will start to switch, so that the DC voltage will charge and discharge the inductor cyclically, thus obtaining AC voltage.

5, LC oscillation and output circuit: to ensure the required voltage of 1600V when the lamp is started, and reduce the voltage to 800V after its startup.

6. Feedback loop: When the inverter is in normal working condition, it is used to stabilize its voltage output.

All in all, the working principle of the inverter is to first convert the direct current into alternating current through the oscillating circuit, and then to obtain the square wave alternating current by the coil boosting, and finally to obtain the sinusoidal alternating current by rectification.

Fourth, the principle of the inverter - - application

The car inverter is a big application of the inverter in life, making our life more convenient. The car inverter has the following characteristics:

First of all, the car inverter breaks the limitations of using the electric appliance in the car, and it is very convenient to connect the electric appliance to the car through the inverter.

Secondly, the method of using the vehicle inverter is also very simple, that is, inserting the vehicle inverter into the cigarette lighter socket of the automobile, confirming that the power indicator light is on, and inserting the power plug of the electric appliance into the socket of the vehicle power converter;

Once again, the car inverter is also very safe, it will automatically protect the shutdown when an overload or short circuit occurs;

Finally, the car inverter is not only suitable for in-vehicle systems, but also for any 12V DC power supply.

Inverter principle