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.
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