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A Series-Parallel Combination Structure Envelope Tracking Power Supply

A technology of combined structure and power tracking, applied in electrical components, regulating electrical variables, instruments, etc., to achieve the effect of improving overall efficiency and reducing power loss

Active Publication Date: 2017-11-14
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

How to track the envelope signal with large swing and high speed changes poses a great challenge to the design of ET power supply

Method used

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  • A Series-Parallel Combination Structure Envelope Tracking Power Supply
  • A Series-Parallel Combination Structure Envelope Tracking Power Supply
  • A Series-Parallel Combination Structure Envelope Tracking Power Supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Accompanying drawing 1 has provided the schematic diagram of the series-parallel combination structure of the envelope tracking power supply adopting the first kind of current control strategy, and accompanying drawing 1 (a) has provided the complete circuit structure, wherein the highest level diode D n and the lowest level switching tube SW 1 Can omit as shown in accompanying drawing 1 (b).

[0038]Among them, the level supply unit converts the input voltage into the required multi-level output, and there are many ways to realize it. Figures 3(a) and 3(b) show two of the available methods. According to the characteristics of the input reference signal, the first control signal generation unit compares it with multiple set amplitudes to obtain the control signal of the switch tube of the multi-level switching unit, so as to provide the previous level to the multiple levels output by the unit A step wave voltage modulated to fit the shape of the output voltage power...

Embodiment 2

[0042] Accompanying drawing 2 has given the schematic diagram of the series-parallel combination structure of the envelope tracking power supply adopting the second current control strategy, and accompanying drawing 2 (a) has provided the complete circuit structure, wherein the diode of the highest level D n and the lowest level switching tube SW 1 It can be omitted as shown in accompanying drawing 2 (b).

[0043] In this example, the realization of the level supply unit and the switching unit is the same as that of Example 1, and the control strategy for the chopper circuit is different. In the second current control method, the output current of the chopper circuit is open-loop control, and the reference signal is directly calculated, compared with the preset value to control the action of the switch tube in the corresponding chopper circuit. Particularly, when the chopping circuit adopts the scheme shown in accompanying drawing 5 (B), this preset value is v ref / 2. a...

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Abstract

The invention provides a series-parallel combination structure envelope tracking power supply, which includes a level supply unit, a level switching unit, a class A linear amplifier, a chopper circuit and a control circuit, and the level supply unit provides multiple channels for the level switching unit. Independent level, the output of the level switching unit is connected to the input of the class A linear amplifier, and the output of the class A linear amplifier supplies power to the load; the output of the chopper circuit supplies power to the load at the same time through an inductor, and the input of the control circuit is connected to the class A linear amplifier The input and output of the voltage regulator are respectively connected to the level switching unit and the chopper circuit. There are two ways to implement the control circuit, 1 is composed of a current sampling circuit, a minimum value detection unit and two control signal generation units, so that the chopper circuit can provide the lowest amplitude current in the load current; 2 is composed of two control signal generation units , so that the chopper circuit provides part of the triangular wave current in the load current.

Description

technical field [0001] The invention relates to a series-parallel combined structure envelope tracking power supply, which is applied to a wireless communication base station power supply system and belongs to the category of communication and power conversion. Background technique [0002] With the development of the times, the scale of mobile communication networks is increasing day by day. If the data communication rate is too low, it will not be able to meet the development needs of larger capacity and higher speed of mobile multimedia services. In order to increase the data transmission rate, modern wireless communication uses efficient digital modulation techniques, such as quadrature phase shift keying, quadrature amplitude modulation, etc., to improve the efficiency of spectrum utilization, and the envelope of its radio frequency signal (Radio Frequency, RF) From the original constant form to the form of irregular amplitude changes. In order to ensure the linearity...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
Inventor 金茜阮新波王亚洲冷阳
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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