Conditions solar inverter technology

When the PV / wind hybrid system uses an 220 volt inverter  the first is to determine the inverters are several main technical parameters: input DC voltage range, such as DC24V, 48V, 110V, 220V, etc.;
Rated output voltage, such as three-phase 380V, single-phase or 220V;
The output voltage waveform, such as sine, trapezoidal or square wave.

The working principle of the inverter

A, generating a square wave
CD4069 used here constitute a square-wave signal generator. R1 is the compensation resistor circuit, the oscillation frequency to improve due to the supply voltage changes caused by instability.solar controllersoscillator circuit is completed by the charge and discharge of the capacitor C1. The oscillation frequency f = 1/2.2RC. Maximum frequency circuit is shown: fmax = 1/2.2x103x2.2x10-6 = 62.6Hz, the minimum frequency fmin = 1/2.2x4.3x103x2.2x10-6 = 48.0Hz. Because of the error components, the actual value will be slightly different. Phase other unwanted hair, the other input terminal of the circuit to avoid the impact.
Square wave generating circuit
Second, the FET drive circuit.
Since the oscillation signal voltage output square wave signal generator is the maximum amplitude of 0 ~ 5V, the full drive power switching circuit used here TR1, TR2 of the oscillation signal voltage 220 volt power inverters amplified to 0 ~ 12V. As shown in Figure
FET drive circuit
Third, the power FET switching circuit
FET is the core of the device, the introduction of the basic principles of FET Refer dz3w Station Related Articles: How it works MOS FET introduction.

220 -volt inverter brief

DC voltage two routes , one to the front stage IC power supply generates a control signal KHZ level , all the way to the pre- power tube . By a control signal to promote the high-frequency switching power tube continuously produce low-voltage transformer primary frequency alternating current ( AC although this time the voltage is low, but the 12 volt inverter is very high, the purpose is to allow the class to generate a high voltage transformer , the front stage voltage output proportional to the frequency and the level , of course, but also in power tube can withstand the frequency range ) , high-frequency alternating current through the high-frequency transformer output then after fast recovery diode full bridge rectifier outputs a high frequency of several hundred V DC to after class power management, control signal and then generates about 50HZ to control the level of work and output AC power tubeOff grid inverter by stage IC.
Of course, a complete inverter also needs some protection circuitry, such as low input voltage overload protection temperature protection and filter circuit, a high frequency filter circuit in quite important and should be easy to produce some high frequency interference and parasitic coupling , it is necessary a filter circuit to filter out the effects of these factors to increase the stability of the circuit.