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: इनपुट भाग छ 3 संकेतहरू, 12V DC इनपुट VIN, कार्य सक्षम भोल्टेज ENB र प्यानल वर्तमान नियन्त्रण संकेत DIM. VIN एडाप्टर द्वारा प्रदान गरिएको छ, र ENB भोल्टेज MCU द्वारा मदरबोर्डमा प्रदान गरिएको छ, and its value is 0 वा 3V. जब ENB=0, इन्भर्टरले काम गर्दैन, र जब 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. लोडमा इन्भर्टरले उपलब्ध गराएको वर्तमान पनि फरक हुनेछ. DIM मान जति सानो हुन्छ, the current output by the inverter. ठूलो.

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

3. PWM नियन्त्रक: यसमा निम्न कार्यहरू छन्: आन्तरिक सन्दर्भ भोल्टेज, त्रुटि एम्पलीफायर, थरथरानवाला र PWM, over-voltage protection, कम भोल्टेज सुरक्षा, short-circuit protection, output transistor.

4. डीसी रूपान्तरण: 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 दोलन र आउटपुट सर्किट: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. आउटपुट भोल्टेज प्रतिक्रिया: जब लोड काम गरिरहेको छ, the sampled voltage is fed back to stabilize the voltage output of the inverter