The working principle of the inverter is to control the operation of the entire system through a control circuit. The inverter circuit completes the function of converting direct current to alternating current, and the filter circuit is used to filter out unwanted signals.

The work of the inverter circuit can also be refined as follows: first, the oscillating circuit converts direct current into alternating current; secondly, the coil boosts the irregular alternating current into square wave alternating current; finally, rectification makes the alternating current into a sine wave alternating current through a square wave.

The working principle of each part of the inverter

1. Input interface part: قسمت ورودی دارد 3 سیگنال ها, 12VIN ورودی DC, فعال کردن ولتاژ ENB و سیگنال کنترل جریان پانل DIM. VIN توسط آداپتور ارائه می شود, و ولتاژ ENB توسط MCU روی مادربرد تامین می شود, and its value is 0 یا 3 ولت. وقتی ENB=0, اینورتر کار نمی کند, و زمانی که ENB=3V, the inverter is in normal working state; while the DIM voltage Provided by the main board, the range of variation is between 0-5V. Different DIM values ​​are fed back to the feedback terminal of the PWM controller. جریان ارائه شده توسط اینورتر به بار نیز متفاوت خواهد بود. هر چه مقدار DIM کوچکتر باشد, the current output by the inverter. بزرگتر.

2. Voltage start circuit: When ENB is at high level, it outputs high voltage to light the panel's backlight tube.

3. کنترلر PWM: توابع زیر را دارد: ولتاژ مرجع داخلی, تقویت کننده خطا, اسیلاتور و PWM, محافظت در برابر ولتاژ بیش از حد, under-voltage protection, حفاظت در برابر اتصال کوتاه, output transistor.

4. تبدیل DC: The voltage conversion circuit is composed of MOS switch tube and energy storage inductor. The input pulse is amplified by the push-pull amplifier and then drives the MOS tube to switch, so that the DC voltage can charge and discharge the inductor, so that the other end of the inductor can be Obtain AC voltage.

5. مدار نوسان LC و خروجی: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. بازخورد ولتاژ خروجی: وقتی بار کار می کند, the sampled voltage is fed back to stabilize the voltage output of the inverter