| With the development of technology and the popularity of vehicle, peoplegradually treat the vehicle a means of transportation and a entertainment. More andmore owners will mount electronic devices on their vehicles, such as: mobile TV,audio, DVD,etc., and they use mobile phones, panel computers and other mobileelectronic devices in the vehicle. Therefore, car power inverter is needed for more andmore people.In order to meet the needs of in-vehicle electronic devices, power inverter designrequires output220V/50Hz AC with a12V DC power input.In this paper, high-frequency boost method and sine wave inverter method areused to design an in-vehicle inverter. High-frequency boost uses a push-pull circuittopology while the controlling method is current-type PWM mode. Compared to othercircuit topologies, push-pull transformer has small size, high efficiency, small outputcurrent ripple characteristics. Compared to the voltage-type PWM mode, thecurrent-type PWM mode can effectively prevent the disastrous effect caused by theexcessive current through the transformer. In this paper, a simulation software Saberis used to help the design of the boost. The Saber can accurately analyze the leakageinductance in circuit and this is helpful for the design of transformer absorbing circuit.The sine wave inverter uses the full-bridge inverter circuit topology and SPWMcontrol method in which the drive of switchs using opto-couplers and the SPWMcontrol method using the natural sampling. After filters, a nearly sinusoidal output isgotted.This design achieves a220V/50Hz AC output with a9~15V DC input andoutput power is up to150W. |
