Pracovný princíp meniča je riadenie prevádzky celého systému pomocou riadiaceho obvodu. Obvod meniča dokončí funkciu prevodu jednosmerného prúdu na striedavý prúd, 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: Vstupná časť má 3 signály, 12V DC vstup VIN, pracovné aktivačné napätie ENB a riadiaci signál prúdu panela DIM. VIN poskytuje adaptér, a napätie ENB zabezpečuje MCU na základnej doske, and its value is 0 alebo 3V. Keď ENB=0, menič nefunguje, a keď 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. Prúd dodávaný meničom záťaži bude tiež odlišný. Čím menšia je hodnota DIM, the current output by the inverter. Čím väčší.

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

3. PWM regulátor: Má nasledujúce funkcie: vnútorné referenčné napätie, chybový zosilňovač, oscilátor a PWM, over-voltage protection, ochrana pod napätím, short-circuit protection, output transistor.

4. DC konverzia: 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 oscilačný a výstupný obvod: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. Spätná väzba výstupného napätia: Keď záťaž funguje, the sampled voltage is fed back to stabilize the voltage output of the inverter