On the inverter principle

On the inverter principle

First, the inverter principle - - Introduction

Inverter (Inverter), also known as converters, reverse flow, and the rectifier is just the opposite, is a kind of direct current into 220V AC equipment. It can be divided into half-bridge inverter, a full-bridge inverter, is now widely used in computers, televisions, air conditioners, refrigerators, fans and other equipment.

Second, the inverter schematics

The inverter by the inverter bridge, control logic, and filter circuit, the schematic diagram shown below, including input interface, voltage startup circuit, MOS switch, the DC conversion circuit, PWM control, the feedback loop, LC oscillator and output circuit parts, load and the like.

Third, the inverter principle

First, let's take a look at the various components of the inverter are played what role it ~ ~

1, an input interface: The input section has three interfaces, respectively 12V DC input voltage VIN, work enable voltage ENB, Panel current control DIM three signals. Where the VIN provided by the Adapter (adapter); ENB provided by MCU (microcontroller), its value is 0 or 3V, when ENB is 0V, indicating the inverter is not in normal operation, when ENB is 3V, it indicates that the inverter in normal working condition; DIM provided by the board, whose value varies between 0 ~ 5V, the smaller the feedback to the PWM controller DIM value, the inverter to the current load becomes.

2, voltage start circuit: receiving operation enable voltage ENB, when ENB of 3V, lit Panel backlight lamp, showing the inverter is in normal working condition.

3, PWM controllers: Panel current control DIM signal reception, complete overvoltage protection, undervoltage protection, short circuit protection, pulse width modulation functions.

4, the DC conversion circuit: the MOS switch and inductor constituted, when receiving the 12V DC voltage VIN, MOS tube begins to make a switching operation, so that the DC voltage of the inductance cycle of charge and discharge, resulting in an AC voltage.

5, LC oscillator and output circuit: to guarantee 1600V voltage needed to start the lamp and its start after the voltage down to 800V.

6, the feedback loop: When the inverter is in normal working condition, in order to stabilize its voltage output.

In short, the inverter works by first oscillator circuit by the DC into AC, secondly to get a square wave alternating current through the coil step-up, and finally get sine wave AC power by the rectifying process.

Fourth, the inverter principle - - Application

Car inverter is an inverter in life a large application, to make our lives easier. Car inverter has the following characteristics:

First, the car inverter broke the use of electrical appliances in the car a lot of limitations, can be connected through an inverter to electrical cars up its power, is very convenient;

Secondly, car inverter is also very simple to use, is inserted into the car inverter car cigarette lighter socket, confirmed its power indicator light, the appliance plugged into a car power adapter to the inner socket;

Again, car inverter is also very safe, when an overload or short-circuit protection will automatically shut down;

Finally, car inverter applies not only to vehicle systems, but also for any occasion with a 12V DC power supply.

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