Parallel envelope tracking power supply

Abstract

The invention discloses a parallel envelope tracking power supply which comprises a switching converter, an AB type linear amplifier and a full feed-forward control circuit, wherein a Buck converter or a synchronous rectification Buck converter is used as the switching converter; the full feed-forward control circuit comprises a current sampling circuit, a current regulator, a proportional differential feed-forward circuit, a phase inverter, an adder, a PWM (Pulse Width Modulation) modulator and a driving circuit; the current sampling circuit is used for detecting the output current of the AB type linear amplifier, comparing the output current with a current reference signal and feeding an error signal into the current regulator; and an output signal of the proportional differential feed-forward circuit is processed by the phase inverter, the output signal of the proportional differential feed-forward circuit and an output signal of the current regulator are fed into the PWM modulator after being subjected to additive operation by the adder, and then a driving signal of the switching converter is obtained by the driving circuit. The structure is mainly used for the switching Buck converter and the AB type linear amplifier; an output voltage full feed-forward control method is adopted; and the system efficiency is improved.

Description

Technical field [0001] The invention belongs to the field of communication and power conversion, and particularly relates to a parallel structure envelope tracking power supply applied to a wireless communication base station power supply system. Background technique [0002] In the information age, people rely more and more on information, and obtaining fast and reliable communication anytime and anywhere, the so-called mobile communication, has become a goal that people are constantly pursuing. The development of mobile communication technology has gone through three stages so far: The first generation of mobile communication systems used analog frequency division multiple access technology, which was an innovation of great significance in the 1980s. However, the capacity of the analog communication system is relatively small, and the business type is relatively single, limited to voice services. Therefore, after a short period of glory, it was quickly replaced by the second-ge...

AI Technical Summary

Problems solved by technology

For example, for mobile phone base stations, PA occupies 50% of the power usage, while its constant voltage power supply efficiency is only about 15%, which causes a huge waste of energy

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