The Studying Of High-Power Intelligent Power Management Technique Based On USB TYPE-C Protocol Specifications

With the continuous development of the information technology,the demands for data interaction and power transmission have been further expanded.For applications in desktop computers,televisions,workstations,or portable devices like mobile phones and tablet computers,the USB interface is absolutely the most direct link to data and power transmission.Meanwhile,modern devices not only have a clear demand on data transfer rate,but also put forward requirements of the power transmission capacity of USB.100 W power transmission ability becomes the new interface standard to be achieved under USB3.1 interface specification,and only USB TYPE-C interface can support this power transmission.Traditional and previous specifications of the interface protocol cannot meet the requirement,while we need to promote the next generation of USB 3.1 protocol specification which has the potential to provide higher speed and higher power transmission.However,domestic research on USB 3.1 protocol specification is still on an early stage,and most high-end power management chips are imported from oversea.Some key technologies are not accessible due to restrictions.Conquering key technologies of new-generation high-end USB3.1 can accelerate the development of domestic IC design industry.In this thesis,the latest research progress have been reviewed and analyzed.The dissertation focuses on the technique of high power supply management chip and key performance for USB TYPE-C interface and protocols.The contents of this dissertation include the wide range power supply voltage regulate circuit,low power consumption dynamic adjustment circuit,power circuit and power tube hybrid circuit,etc.The innovations of this thesis are described in detail as follows:(1)A low-power wide-range power supply voltage adjustment technique is proposed.Adopting the method of two-step adjustment and automatic switching of precision,the input voltage is adjusted in two stages,which can achieve low input voltage start,high precision voltage output,and increasing the output current capability of the module.The two-stage power supply adjustment circuit can also realize soft start function,reduce the starting surge voltage,and improve the start-up performance.The input voltage may be varied within a range of 2.5 to 45 V.In standby mode,the minimum standby current of the HVDC conversion system is only 0.3?A.The power adjustment circuit can output a maximum load current of 60 mA.When the input power supply voltage is low,it can still provide sufficient load-driving capacity.When the input power supply voltage is high,it can automatically perform low voltage conversion to ensure the stability of the output voltage.The USB TYPE-C portable device has a lower supply voltage.The lower the supply voltage,the longer the operating time is.The technology implementation circuit is verified on the 0.25 ?m BCD process platform.The measured results prove the superiority of this circuit technology.(2)A high-power unidirectional power transmission and control technology is studied.A reversal power path preventing technology using in low-voltage start-up is proposed.In a dual-side power supply system or a unidirectional charge management system,it is possible to achieve a positive transmission power,which supplies power to the load or charges the battery and to prevent reverse transmission of power in order to avoid a detrimental effect on the power supply equipment or electrical applications.Besides,it can also prevent reverse discharge of the battery in the charging system,thereby effectively ensuring the normal operation of the system and avoiding security risks.The technology can be applied to various portable electronic devices with USB TYPE-C interface.Through the flexible configuration of the pressure path design,the battery can detect low input voltage conditions to achieve low battery voltage charging.The continuous charging is maintained under high voltage input conditions,having a wide input voltage range.The technology implementation circuit was tested on the 0.18 ?m BCD process platform.(3)A dynamic output power adjustment technique is proposed.The working mode of high-power power management chip under different application conditions and output power requirements were studied.In battery supply systems,abnormal load fluctuations and shutdown may occur under high-power output conditions.This situation leads to short battery life and low efficiency.In the USB TYPE-C interface charge management system,the power transmission is large and the stability of the power output is high.This technology adopts the method of dynamic power allocation to automatically adjust the output power step-by-step when the input power supply voltage decreases.In a battery-powered device with this technique,the stability and reliability of the system can be maintained when the battery voltage continues to drop.The load device can be protected,and the effective working time of the battery-powered device is prolonged.(4)A power MOSFET grouped hybrid drive control technique is proposed.The switching characteristics of the power MOSFET are analyzed.For the power transistor integrated on the chip,due to the fixed gate capacitance,a fixed dead time is designed.In this work,power MOSFETs are grouped,and a buffer array with the same circuit structure and layout are designed.This power MOSFET grouping hybrid driving mode will reduce the voltage and current overshoot when the device is turned on and off.