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: Ievades daļai ir 3 signāliem, 12V DC ieeja VIN, darba aktivizēšanas spriegums ENB un paneļa strāvas vadības signāls DIM. VIN nodrošina adapteris, un ENB spriegumu nodrošina mātesplates MCU, and its value is 0 vai 3V. Kad ENB=0, invertors nedarbojas, un kad 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. Arī strāva, ko invertors nodrošina slodzei, būs atšķirīga. Jo mazāka ir DIM vērtība, the current output by the inverter. Jo lielāka.

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

3. PWM kontrolieris: Tam ir šādas funkcijas: iekšējais atsauces spriegums, kļūdu pastiprinātājs, oscilators un PWM, pārsprieguma aizsardzība, zemsprieguma aizsardzība, īssavienojuma aizsardzība, output transistor.

4. Līdzstrāvas pārveidošana: 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 svārstību un izejas ķēde: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. Izejas sprieguma atgriezeniskā saite: Kad slodze strādā, the sampled voltage is fed back to stabilize the voltage output of the inverter