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: Įvesties dalis turi 3 signalus, 12V DC įvestis VIN, darbo įjungimo įtampa ENB ir skydelio srovės valdymo signalas DIM. VIN suteikia adapteris, o ENB įtampą teikia pagrindinės plokštės MCU, and its value is 0 arba 3V. Kai ENB=0, keitiklis neveikia, ir kai 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. Inverterio apkrovai tiekiama srovė taip pat skirsis. Kuo mažesnė DIM reikšmė, the current output by the inverter. Kuo didesnis.

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

3. PWM valdiklis: Jis turi šias funkcijas: vidinė atskaitos įtampa, klaidų stiprintuvas, osciliatorius ir PWM, apsauga nuo viršįtampių, apsauga nuo žemos įtampos, apsauga nuo trumpojo jungimo, output transistor.

4. DC konvertavimas: 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. LC virpesių ir išėjimo grandinė: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. Išėjimo įtampos grįžtamasis ryšys: Kai krovinys veikia, the sampled voltage is fed back to stabilize the voltage output of the inverter