A switched capacitor high bandwidth envelope tracking power supply circuit and its control method

A switched-capacitor circuit, tracking power technology, applied in electrical components, output power conversion devices, conversion equipment without intermediate conversion to AC, etc. The problem of shortening the turn-off time can reduce the complexity and cost of the circuit, improve the switching performance and reliability, and extend the turn-on and turn-off time.

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A switched-capacitor circuit, tracking power technology, applied in electrical components, output power conversion devices, conversion equipment without intermediate conversion to AC, etc. The problem of shortening the turn-off time can reduce the complexity and cost of the circuit, improve the switching performance and reliability, and extend the turn-on and turn-off time.

CN108616217BActive Publication Date: 2020-04-14NANJING TECH UNIV

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Embodiment 1

[0019] Example 1 reference figure 1 , a switched capacitor high-bandwidth envelope tracking power supply circuit, comprising a step wave voltage generating circuit and a class A linear amplifier, wherein the step wave voltage generating circuit is formed by connecting n switched capacitor circuits with the same structure in series;

[0020] where the nth switched capacitor circuit includes a power supply V n , the first-stage switched capacitor circuit unit, the second-stage switched capacitor circuit unit, ..., the m-1th stage switched capacitor circuit unit and the m-th stage switched capacitor circuit unit; the m-th stage switched capacitor circuit unit includes a main switch Tube Q nm , auxiliary switching tube Q nmr , Diode D nm and capacitance C nm , the main switch Q nm source, auxiliary switch Q nmr The drain and capacitor C nm One end of the diode D is connected to each other nm anode of the supply V n connected to the anode of the diode D nm The cathode and...

Embodiment 2

[0025] Example 2 reference figure 2 , on the basis of Embodiment 1, the Pth switched capacitor circuit is provided with a diode D ncP , the diode D nP The cathode and diode D ncP The cathode and the capacitor C nP The other end is connected; the diode D ncP The anode of the main switch Q nP The drain is connected; wherein, m>=P>=2, and P is an integer. Compared with Example 1, Example 2 can balance the charging and discharging time of each switching capacitor more.

[0026] figure 1 and figure 2 in, V 1 -V n stands for power, Q 11 -Q nm Represents the main switching tube, Q 11r -Q nmr Represents the auxiliary switching tube, D 11 -D nm Represents a diode, τ represents a delay circuit unit; the voltage regulator and the delay circuit unit are prior art, not described here, the power tube Q 1 Using a MOS tube or a triode, the voltage divider circuit unit is composed of a resistor R u and resistor R d formed in series, the resistor R u One end and power tube ...

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Abstract

The invention discloses a switched capacitor type high-bandwidth envelope tracking power supply circuit, which includes a step wave voltage generating circuit and a class A linear amplifier, the step wave voltage generating circuit and the class A linear amplifier are connected in cascade, and the step wave voltage generating circuit The output is used as the input of a class A linear amplifier. The ladder wave voltage generating circuit is composed of n switched capacitor circuits with the same structure in series. The switching frequency of the switching tube in each switched capacitor circuit can achieve (1 / n):1 frequency reduction relative to the tracking signal frequency, and at the same time effectively expand The turn-on or turn-off time of the switch tube can be fully turned on or off to improve its working performance and reliability under high-bandwidth tracking conditions; compared with traditional methods, it can greatly reduce the number of power supplies and reduce the complexity of the circuit level and cost, and improve system efficiency.

Description

technical field [0001] The invention relates to a switched capacitor type high-bandwidth envelope tracking power supply, which is applied to wireless communication occasions. Background technique [0002] The development of mobile communication started from the first generation of mobile communication (1st Generation, 1G) commercially available in the late 1970s to the fourth generation of mobile communication (4th Generation, 4G) commercially available today, both in terms of modulation and information transmission Quantitatively, there has been a huge change. The first generation of mobile communication technology (1G) mainly uses analog cellular network technology, and the implementation methods include frequency division multiple access and carrier multiplexing. The second generation of mobile communication technology (2nd Generation, 2G) uses digital communication technology, through time division and code division multiple access technology to realize radio frequency ...

Claims

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Application Information

Patent Timeline

14 Apr 2020

Publication

CN108616217B

IPC: H02M3/07

CPC: H02M3/07; H02M1/0067

Inventors: 郗焕; 刘宁