Tag: powe inverter

Pure sine wave inverters have strict requirements for function and parameters. It is more expensive and can be used in electronic circuits that require higher waveform parameters. The ordinary inverter is a hybrid waveform of a sine wave, square wave, clutter and other components, which can be used for general electrical appliances, and the price is low.

Inverter is a kind of transformer converting the low-voltage DC power (usually such as the power output by the battery) into the high-voltage AC high-frequency power (sine wave AC power of 220V 50Hz or 110V 60Hz). Take a 12V DC to 220V AC car power inverter as example to illustrate the working principle briefly. Firstly, the 12V low-voltage DC power in the vehicle is converted into the high-voltage DC power of around 265V, and then the 265V DC power is converted into the sine wave AC power of 220V, 50Hz. The main inner components of power inverter include the Inverter Bridge, filter circuit, oscillator, control logic circuit and so on. At present, a large amount of various power inverters are filled in various e-commerce platforms. The cheapest one is only tens of dollars, but the expensive ones can cost several hundreds or even one thousand dollars. The maximum power it sustains range from dozens of wattages to several hundreds of wattages. Then, what kind of power inverter can we choose?

A power inverter or inverter plays a role in converting the DC power from batteries to AC power for charging most appliances. According the output wave forms, it can be mainly divided into modified sine wave inverters and pure sine wave inverters. Then, what are the differences between them?
A modified sine wave inverter outputs waveform that has a time interval from the maximum value in the positive direction to the negative value in the negative direction. That means, the waveform is still composed of broken lines, thus without good continuity. However, pure sine wave inverters can output stable true sine wave power as good as the one from the grid we use every day, without electromagnetic pollution. However, the pure sine wave inverter can output stable true sine wave power as good as the one from the grid we use every day, without electromagnetic pollution. It works higher efficiently, suitable for all kinds of loads. The pure sine wave inverter can be applied for common appliances and devices without interference.

1. Device lifetime
In the broad sense, the inverter is a Switching Mode Power Supply, so its components can be basically divided into resistor, capacity, diode power devices (IGBT or MOS tubes), inductor and transformer, current sensor, IC, optocoupler and relay.
Generally, service life of the resistor, chip capacitor and ceramic capacitor can be more than20 years. Theoretically, the inductor and transformer are defaulted to work for long time without failure on the design if only not exceeding the material temperature. Diodes and triodes with small power can work more than 100 thousand hours basically; The mechanical life of the relay is generally more than 1 million times and the electrical life is more than 10 thousand times; Generally, power device IGBT or MOS do not consider the life as long as they meet design specifications. The fan and fuse are vulnerable components, they will not affect the service life of the inverter, and they can be replaced as long as they break; service life of the film capacitor is more than 100 thousand hours and that of electrolytic capacitor is 2000-3000H at 105℃, the service life may also be 5000-6000H, and it doubles as the temperature decreases 10℃. Therefore, the weakest device of the inverter lies in the service life of the electrolytic capacitor.