The Design Of A Controller For Three-Phase Motor Rectification

Rectifier is an early type in the circuit system.Its function is to convert AC power into DC power.The rectifier can be divided into single-phase circuits and multi-phase circuits according to the number of AC input phases.This thesis focuses on three-phase bridge rectifier circuit.With the popularity of automotive electronics,there are many electronic devices in the car.These electronic devices are powered by batteries.The generator in the car charges the battery.Therefore,it is necessary to study high performance rectifiers.High-performance rectifiers can significantly improve power generation efficiency,reduce carbon dioxide emissions from automobiles,and achieve energy-saving emission reduction targets.The design of a controller for three-phase motor rectification is based on Synchronous Rectifier Techniques.It replaces traditional diode rectifier with controllers and power MOSFETs.The chip operates at 7~18V,consuming 200μA,and operating frequency range of 60Hz-2.1KHz.It has overvoltage,undervoltage and overtemperature protection circuits.The main contents of this paper include the following aspects:1.Functional analysis of controller.The performance of each module and chip architecture are determined according to the requirements of the project.The selection principle of resistors,capacitors and bootstrap diodes is also determined on the basis of typical application circuit of controller.2.Principle analysis and design of each module of controller.Design and simulate the module based on a 0.35μm BCD process by using the Cadence IC tools.This paper includes the following module: power,gate driver,current detection,protection circuits and oscillator and provides simulation results.3.The layout design of controller.Some layout design considerations have been summarized according to the BCD process.Finish the part of the chip layout and the area of chip is 2mm×2mm.Test the chip sample.Test the module function of the samples.The test results of LDO,gate driver and minimum conduction time meet the design specifications.The function of single-phase rectification system is proper.