Dynamic Segmentation Technology Of Envelope Power Supply Tracking Voltage

Since the development of mobile communication,in order to achieve higher transmission rates,many modulation methods have been derived.The modulation process not only modulates the phase of the signal,but also modulates the amplitude.So the envelope of the RF signal is no longer constant.The traditional RF power amplifier power supply method is extremely inefficient.At present,the envelope tracking(ET)technology proposed by some scholars can effectively improve the efficiency.ET power supply is the core device of ET technology,and its efficiency and tracking bandwidth affect the efficiency of RF power amplifier.In this paper,the RF envelope under 64 QAM modulation is tracked,and a parallel switch/linear composite ET power supply is designed according to its characteristics.In a parallel switched/linear composite ET power supply,the switching converter mainly provides the low frequency energy in the RF envelope.In the previous research work,the switching converter in the ET power supply operates at a switching frequency that changes with the change of the envelope amplitude,and the output high-frequency switching harmonic components are rich.Therefore,in the aspect of control method,this research proposes a method to control the switching converter in the ET power system with a constant frequency,that is,the averaging reference control.And the influence of the magnitude of the constant reference generation amplitude and the step time on the overall efficiency of the power supply is discussed in detail.In the course of the experiment,it is found that only one switching converter compensates the energy,and the energy cannot be supplemented in the case of some high-amplitude envelopes.In order to further improve the efficiency,a high-frequency switching converter is introduced on the basis of the low-frequency switching converter,and the control of the high-frequency switching converter also adopts the method of averaging reference,which is also a constant frequency control method.Finally,an experimental prototype is studied in this paper,and the feasibility of the scheme is verified by experiments,and the distribution of the efficiency of the ET power supply with the averaged time of the benchmark is also verified.