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Inverter working principle


Inverter is a DC to AC transformer, which is actually a voltage inversion process.

The converter is a 12V dc output that transforms the ac voltage of the grid into a stable 12V dc, and the inverter is a 12V dc voltage that transforms the Adapter output to high voltage alternating current with high frequency. Both parts also use a more widely used pulse width modulation (PWM) technique. The core part is a PWM integrated controller, the Adapter USES UC3842, and the inverter USES the TL5001 chip.TL5001 working voltage range of 3.6 ~ 40 v, the interior has an error amplifier, a regulator, oscillator, a dead zone control of PWM generator, low voltage protection circuit and short circuit protection circuit, etc.

1.Input the interface part: the input part has 3 signals, 12V dc input VIN, work enables voltage ENB and Panel current control signal DIM.VIN is provided by the Adapter, the ENB voltage is supplied by the MCU on the motherboard, the value is 0 or 3V, and when ENB = 0, the inverter does not work, while ENB = 3V, the inverter is in the normal state of work; And DIM voltage supplied by the main board and its change range between 0 ~ 5 v, different DIM value feedback to the PWM controller, inverter for the load current will also be different, DIM value is smaller, the greater the inverter output current.

2. Voltage start circuit: ENB is high current, output high voltage to light up Panel's backlight lamp tube.

3. The PWM controller: consists of the following function: the internal reference voltage, error amplifier, oscillator and PWM, over-voltage protection, under-voltage protection, short circuit protection, out put transistor.

4. Dc transform: composed of MOS switch tube and energy storage inductor voltage conversion circuit, the input pulse drive after a push-pull amplifier amplified MOS tube do switch action, makes the dc voltage to charge and discharge of inductance, so that the other end of the inductance can be ac voltage.

5. LC oscillations and output circuits: the 1600V voltage required for the lamp to be activated and the voltage down to 800V after the lamp is started.

6. Output voltage feedback: when the load is working, the feedback sample voltage is used to stabilize the voltage output of the inverter.


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