Inverter (inverter) is the DC energy (batteries, storage batteries) into alternating current (usually 220v50HZ sine or square wave). Emergency power supply, the inverter is generally converted into 220V AC DC battery. In a nutshell, an inverter is a device that converts direct current (DC) to alternating current (AC). It consists of inverter bridge, control logic and filter circuit. Widely used in air conditioners, home theater, electric grinder, electric tools, sewing machines, DVD, VCD, computer, TV, washing machines, range hoods, refrigerators, VCRs, massagers, fans, lighting and so on.
HB in its secondary to get about 220V AC, for TV sets, lights and other appliances emergency use. Note BG1, BG2 two transistor parameters should be consistent in order to get a symmetrical output. BG3, BG4 two high-power transistor parameters should also be matched at the same time should be added heat sink, so as not to burn heat pipe.
Figure is an easy to understand family inverter circuit:
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