Inverter is through the semiconductor power switches on and off function, the DC can be transformed into an AC power converting apparatus, the inverse transform is rectified. Direct current into alternating current through oscillation circuit, and the resulting alternating current through the coil voltage (in this case obtained a square wave alternating current). The resulting alternating current is rectified to obtain sine wave.
Car inverter circuit as a whole can be divided into two parts, each part to adopt a TL494 or KA7500 chips control circuit, where high-frequency PWM (pulse width modulation) switching power supply technology converted to 30Khz-50KHZ, 220V AC or so; second role of the circuit is to use the bridge rectifier, filter, pulse-width modulation and switching power output and other technology, 30KHZ-50KHZ, 220V AC or converted to 50HZ, 220V AC.
Many different types of off grid inverter so select models and capacity requires special attention, especially in the solar power system, inverter efficiency is to determine the size of solar capacity and an important factor in battery capacity.
Divided by the output waveform, the inverter is divided into sine wave inverter and square wave inverter, sine wave inverter output is the same as the grid we use every day or even better sinusoidal alternating current power grid because he does not exist the magnetic contamination. Square wave inverter output is the poor quality of the square wave AC, and its positive maximum to negative maximum almost at the same generation, so that the load and the inverter with charger itself cause severe destabilizing effects. Meanwhile, the load is low, only the rated load of 40% -60%, not with inductive loads. If the load carried by too large, square-wave current third harmonic components contained in the content will flow into the load surname power increases, there will be serious damage to the load of the power supply filter capacitor.
We are in a "mobile" era, mobile office, mobile communications, mobile leisure and entertainment. In moving state, people not only need a battery or battery low voltage DC supply, but also need in our daily environment does not amount or lack of 220 volts AC inverter to meet this demand we.
Inverter is widely used in air-conditioning, home theater, electric grinders, electric tools, sewing machines, DVD, VCD, computer, television, washing machine, cooker hood, refrigerator, VCR, massage, fans, lighting and so on.