Pinag-uusapan ang prinsipyo ng pagtatrabaho ng telecommunications pure sine wave inverter. Pinag-uusapan ang prinsipyo ng pagtatrabaho ng telecommunications pure sine wave inverter, 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: Ang bahagi ng input ay may 3 mga senyales, 12V DC input VIN, gumagana paganahin ang boltahe ENB at Panel kasalukuyang control signal DIM. Ang VIN ay ibinibigay ng Adapter, at ang boltahe ng ENB ay ibinibigay ng MCU sa motherboard, and its value is 0 o 3V. Kapag ENB=0, hindi gumagana ang inverter, at kapag 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. Magiiba din ang kasalukuyang ibinigay ng inverter sa load. Mas maliit ang halaga ng DIM, the current output by the inverter. Ang mas malaki.

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

3. PWM controller: Ito ay may mga sumusunod na function: panloob na sanggunian boltahe, amplifier ng error, osileytor at PWM, proteksyon sa sobrang boltahe, under-voltage protection, proteksyon ng short-circuit, output transistor.

4. DC conversion: 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 at output circuit: to ensure the 1600V voltage required for the lamp to start, and to reduce the voltage to 800V after the lamp is started.

6. Feedback ng boltahe ng output: Kapag gumagana ang load, the sampled voltage is fed back to stabilize the voltage output of the inverter