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A Design of Automotive Power Inverter
Abstract In recent years, with the rapid development of power electronics technology, power inverter is widely used in daily life, automotive systems, post telecommunications and other fields. In modern society, the electronic devices which often used by drivers outdoor are more and more, such as car DVD, car refrigerator, laptop computer, mobile phone chargers and various power adapters. In developed countries, automotive power inverter is a must-have, but in China just a little cars are with such a inverter. Combined with phenomenon that the annual car sales remain high, automotive power inverter will have great market prospects in China.
This paper presents a high-performance automotive power supply. The power supply uses a classic way to convert with two levels: the first level is a DC-DC converter, which first converts 12VDC to 320V/50kHzAC, and then filtered to 320VDC; the second level is a DC-AC converter, which uses sine pulse modulation to control switch conduction, finally outputs stable 220V/50Hz quasi-sine wave after LC filtered. The high-performance automotive power inverter works at high frequency, which can reduce the size and weight of transformer, filter inductor and filter capacitor. On the other hand, the operating frequency is higher than 20kHz which is the limit of the human's ear, which avoids harsh noises of transformers and inductors. The control circuits use the method of PWM and SPWM with the advantages of high efficiency and good frequency characteristics. The SPWM circuits wherein are generated by IC which avoid large calculations and programmings while using SCM. Meanwhile, the design also includes over-voltage, over-current, over-temperature protection circuits to ensure the safety and reliability.
This design uses high-frequency inverting, with benefits of noise reduction, response speed enhancement and flexible circuit adjustment. The design not only meets the general needs, but also meets the development trends of power supply: small volume, light weight, high frequency, high reliability and low noise.
Key words Automotive Power Inverter; Pulse Width Modulation; Protection Circuit
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A Design of Automotive Power Inverter
Abstract In recent years, with the rapid development of power electronics technology, power inverter is widely used in daily life, automotive systems, post telecommunications and other fields. In modern society, the electronic devices which often used by drivers outdoor are more and more, such as car DVD, car refrigerator, laptop computer, mobile phone chargers and various power adapters. In developed countries, automotive power inverter is a must-have, but in China just a little cars are with such a inverter. Combined with phenomenon that the annual car sales remain high, automotive power inverter will have great market prospects in China.
This paper presents a high-performance automotive power supply. The power supply uses a classic way to convert with two levels: the first level is a DC-DC converter, which first converts 12VDC to 320V/50kHzAC, and then filtered to 320VDC; the second level is a DC-AC converter, which uses sine pulse modulation to control switch conduction, finally outputs stable 220V/50Hz quasi-sine wave after LC filtered. The high-performance automotive power inverter works at high frequency, which can reduce the size and weight of transformer, filter inductor and filter capacitor. On the other hand, the operating frequency is higher than 20kHz which is the limit of the human's ear, which avoids harsh noises of transformers and inductors. The control circuits use the method of PWM and SPWM with the advantages of high efficiency and good frequency characteristics. The SPWM circuits wherein are generated by IC which avoid large calculations and programmings while using SCM. Meanwhile, the design also includes over-voltage, over-current, over-temperature protection circuits to ensure the safety and reliability.
This design uses high-frequency inverting, with benefits of noise reduction, response speed enhancement and flexible circuit adjustment. The design not only meets the general needs, but also meets the development trends of power supply: small volume, light weight, high frequency, high reliability and low noise.
Key words Automotive Power Inverter; Pulse Width Modulation; Protection Circuit
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