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: ພາກສ່ວນປ້ອນຂໍ້ມູນມີ 3 ສັນຍານ, 12V DC ປ້ອນຂໍ້ມູນ VIN, ເຮັດວຽກເປີດໃຊ້ແຮງດັນ ENB ແລະແຜງຄວບຄຸມປະຈຸບັນສັນຍານ DIM. VIN ແມ່ນສະໜອງໃຫ້ໂດຍອະແດບເຕີ, ແລະແຮງດັນ ENB ແມ່ນສະໜອງໃຫ້ໂດຍ MCU ໃນເມນບອດ, and its value is 0 ຫຼື 3V. ເມື່ອ ENB=0, inverter ບໍ່ເຮັດວຽກ, ແລະເມື່ອ 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. ປະຈຸບັນທີ່ສະຫນອງໂດຍ inverter ກັບການໂຫຼດຍັງຈະແຕກຕ່າງກັນ. ຄ່າ DIM ນ້ອຍກວ່າ, the current output by the inverter. ໃຫຍ່ກວ່າ.

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

3. ຕົວຄວບຄຸມ PWM: ມັນ​ມີ​ຫນ້າ​ທີ່​ດັ່ງ​ຕໍ່​ໄປ​ນີ້​: ແຮງດັນການອ້າງອີງພາຍໃນ, ເຄື່ອງຂະຫຍາຍສຽງຜິດພາດ, oscillator ແລະ PWM, ການປ້ອງກັນແຮງດັນເກີນ, ການປົກປ້ອງ under-voltage, ການປົກປ້ອງວົງຈອນສັ້ນ, output transistor.

4. DC ແປງ: 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 oscillation ແລະວົງຈອນຜົນຜະລິດ: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. ຜົນຕອບຮັບແຮງດັນ: ໃນເວລາທີ່ການໂຫຼດກໍາລັງເຮັດວຽກ, the sampled voltage is fed back to stabilize the voltage output of the inverter