CN108616217B - Switched capacitor type high-bandwidth envelope tracking power supply circuit and control method thereof - Google Patents
Switched capacitor type high-bandwidth envelope tracking power supply circuit and control method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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Abstract
The invention discloses a switched capacitor type high-bandwidth envelope tracking power supply circuit which comprises a step wave voltage generating circuit and an A-type linear amplifier, wherein the step wave voltage generating circuit and the A-type linear amplifier are in cascade connection, and the output of the step wave voltage generating circuit is used as the input of the A-type linear amplifier. The step wave voltage generating circuit is formed by connecting n switch capacitor circuits with the same structure in series, the switching frequency of a switch tube in each switch capacitor circuit can realize (1/n) frequency reduction relative to the tracking signal frequency, and meanwhile, the on-off time of the switch tube is effectively expanded to fully switch on or off the switch tube, so that the working performance and the reliability of the switch tube under the high-bandwidth tracking condition are improved; compared with the traditional method, the number of power supplies can be greatly reduced, the complexity and the cost of the circuit are reduced, and the system efficiency is improved.
Description
Technical Field
The invention relates to a switched capacitor type high-bandwidth envelope tracking power supply which is applied to wireless communication occasions.
Background
The development of mobile communication has changed dramatically from the first Generation (1st Generation,1G) of mobile communication that was commercially available at the end of the 70 th century to the fourth Generation (4th Generation,4G) of mobile communication that is commercially available today, both in terms of modulation schemes and in terms of the amount of information transmitted. The first Generation mobile communication technology (1G) mainly uses an analog cellular network technology, and the implementation manner includes Frequency division multiple access and carrier multiplexing, and the second Generation mobile communication technology (2nd Generation,2G) uses a digital communication technology, and realizes the transmission of Radio Frequency (RF) signals by time division multiple access and code division multiple access technologies. A Power Amplifier (PA) is responsible for Power amplification of an input RF signal. In the traditional 1G and 2G communication modes, the envelope curve of a radio frequency input signal is constant, so that high-efficiency signal transmission can be realized by adopting a nonlinear power amplifier. However, the frequency band occupied by the constant envelope RF input signal is wide, and the amount of information transmitted in a fixed frequency band is limited, making it difficult to transmit mobile multimedia data such as audio, video, and the like. In order to increase the amount of information to be transmitted, the third Generation (3G) and fourth Generation (4th Generation,4G) mobile communication technologies use orthogonal frequency division multiplexing, orthogonal amplitude modulation, and other techniques to modulate the phase, frequency, and amplitude of an input signal, so that the envelope amplitude of the input signal is not constant. At this time, if the power amplifier is powered by a constant voltage, the system efficiency is even as low as 15%. In order to improve the efficiency of the PA, an Envelope Tracking (ET) technology is adopted to realize high-efficiency transmission in a radio frequency reference signal range, and plays a vital role in reducing the loss of the PA and improving the system efficiency.
Currently, there are three main ways to achieve high efficiency operation of PAs. The Doherty technique, the Envelope Elimination and Restoration (EER) technique and the Envelope Tracking technique (ET) are used, respectively. The Doherty technology needs to use a primary power amplifier and a secondary power amplifier to work cooperatively, so that the cost is high, and the working bandwidth is low. The EER technology adopts a nonlinear power amplifier, the output voltage of an envelope line recovery link is required to be completely consistent with the envelope line amplitude of an input signal, and the requirement on power supply of the power amplifier is severer. In the ET technology, the envelope output voltage tracks the radio frequency reference signal and is slightly higher than the envelope of the RF reference signal, and the requirement on a power supply mode of the PA is not strict than that of a power supply in the EER technology, so that the ET technology has better application prospect and implementation mode.
The multi-level switch linear composite structure ET power supply is concerned more and more widely at present due to simple control and strong robustness. According to the scheme, a series of levels with different amplitudes are selected to form step wave voltage to fit output voltage, and the step wave voltage is used as input of a later-stage linear amplifier. The amplitude of the step wave voltage is slightly higher than that of the output voltage so as to ensure the normal work of the linear amplifier. The linear amplifier finally realizes high-linearity tracking of the reference signal through closed-loop control. In order to reduce the loss of the linear amplifier, the number of multi-levels in the step wave voltage is generally large. For this purpose, a stage of multi-output power supply or a plurality of module power supplies are needed to provide a plurality of level amplitudes. This increases the complexity and cost of the circuitry and reduces system efficiency; on the other hand, since the ET power supply needs to track the envelope of the RF signal, its bandwidth is up to several tens MHz. When the switching converter directly tracks the reference signal with the variable amplitude, the switching frequency of the switching converter is often required to reach 5-10 times of the frequency of the reference signal, so that the switching frequency is too high to be realized. Meanwhile, the switching-on and switching-off time of a switching device is shortened to a few ns level due to too high switching frequency, the switching process is insufficient, even pulse loss occurs, the system reliability is greatly reduced, and the improvement of the tracking bandwidth of the ET power supply is also severely limited.
Disclosure of Invention
The invention provides a switched capacitor type high-bandwidth envelope tracking power supply circuit, which charges and discharges a plurality of capacitors by controlling a gating switch, replaces a multi-path output power supply or a plurality of module power supplies in the traditional control method with the voltages at two ends of the capacitors as a level provider for generating step wave voltage, and greatly reduces the number of paths of the multi-path output power supplies or the number of the module power supplies; on the other hand, the ratio of the switching frequency to the tracking signal frequency can be reduced to (1/n):1, so that the feasibility of high-bandwidth envelope tracking is greatly improved, the on-off time of the switching tube is effectively expanded, and the reliability of the switching tube in high-frequency work is improved.
In order to achieve the purpose, the invention adopts the following specific technical scheme: a switched capacitor type high-bandwidth envelope tracking power supply circuit comprises a step wave voltage generating circuit and an A-type linear amplifier, wherein the step wave voltage generating circuit is formed by connecting n switched capacitor circuits with the same structure in series;
wherein the nth switched capacitor circuit comprises a power supply VnThe circuit comprises a first-stage switched capacitor circuit unit, a second-stage switched capacitor circuit unit, … …, an m-1 stage switched capacitor circuit unit and an m-stage switched capacitor circuit unit; the mth stage switched capacitor circuit unit comprises a main switching tube QnmAuxiliary switch tube QnmrDiode DnmAnd a capacitor CnmThe main switch tube QnmSource electrode, auxiliary switch tube QnmrDrain electrode and capacitor CnmAre connected to each other, the diode DnmAnode and power supply VnThe anode of the diode DnmCathode and capacitor CnmThe other end of the first and second connecting rods is connected;
the first stage of switched capacitorMain switch tube Q in road unitn1Drain electrode of (1) and auxiliary switching tube Qn1rAre respectively connected to a power supply VnA positive electrode and a negative electrode of (1); capacitor C in the m-1 stage switch capacitor circuit unitn(m-1)Are respectively connected with a main switching tube Q in the mth stage switched capacitor circuit unitnmDrain electrode of (1) and auxiliary switching tube QnmrA source electrode of (a);
power supply V of the nth switched capacitor circuitnAnd the diode D of the m-th stage switched capacitor circuit unit of the (n-1) th switched capacitor circuit(n-1)mThe cathode of (a) is connected;
the A-type linear amplifier comprises a power tube Q1The voltage regulator, the time delay circuit unit and the voltage division circuit unit, and the power tube Q1One end of the power tube Q is connected with one end of the voltage division circuit unit1The output end of the voltage division circuit unit is connected with a voltage regulator, the other end of the voltage division circuit unit is grounded, the input end of the delay circuit unit is used for inputting reference voltage, the output end of the delay circuit unit is connected with the voltage regulator, and the voltage regulator is connected with a power tube Q1The control end of the controller is connected;
power supply V of the first switched capacitor circuit1Is grounded, and the diode D of the mth stage switched capacitor circuit unit of the nth switched capacitor circuitnmCathode of and power tube Q of A-type linear amplifier1Is connected at the other end, wherein n>2 and is an integer, m>2 and is an integer.
Furthermore, the P-th switched capacitor circuit is provided with a diode DncPSaid diode DnPCathode and diode DncPCathode and capacitor CnPThe other end of the first and second connecting rods is connected; the diode DncPAnode and main switch tube QnPA drain electrode is connected; wherein m is>＝P>P is an integer equal to 2.
Compared with the prior art, the invention has the following characteristics: the stepped wave voltage generating circuit is connected with the A-type linear amplifier in a cascade mode, the output of the stepped wave voltage generating circuit is used as the input of the A-type linear amplifier, the stepped wave voltage generating circuit is formed by connecting n switched capacitor circuits with the same structure in series, the switching frequency of a switching tube in each switched capacitor circuit can achieve (1/n):1 frequency reduction relative to the tracking signal frequency, and the feasibility of working under the condition of a high-frequency tracking signal is improved; meanwhile, compared with the traditional method, the number of module power supplies is reduced, and the circuit complexity and the cost are reduced. Meanwhile, under the high-bandwidth envelope tracking condition, compared with the traditional method, the method can effectively expand the on-off time of the switching tube so as to ensure the switching tube to be fully turned on and fully turned off, thereby improving the switching performance and the working reliability of the switching tube during high-frequency working and really realizing the high-bandwidth envelope tracking.
Drawings
Fig. 1 is a schematic structural diagram of a switched capacitor high bandwidth envelope tracking power supply circuit according to a first embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a switched capacitor high bandwidth envelope tracking power supply circuit according to a second embodiment of the present invention.
Fig. 3 is a schematic diagram showing control signals of the switching tubes in the present invention.
Fig. 4 shows the operation mode of the single switched capacitor circuit in embodiment 2.
Detailed Description
The following description of the embodiments of the present invention will be made in conjunction with the accompanying drawings to better understand the point of the invention.
wherein the nth switched capacitor circuit comprises a power supply VnThe circuit comprises a first-stage switched capacitor circuit unit, a second-stage switched capacitor circuit unit, … …, an m-1 stage switched capacitor circuit unit and an m-stage switched capacitor circuit unit; the mth stage switched capacitor circuit unit comprises a main switching tube QnmAuxiliary switch tube QnmrDiode DnmAnd a capacitor CnmThe main switch tube QnmSource electrode, auxiliary switch tube QnmrDrain electrode and capacitor CnmAre connected to each other, the diode DnmAnode and power supply VnThe anode of the diode DnmCathode and capacitor CnmThe other end of the first and second connecting rods is connected;
main switch tube Q in first-stage switch capacitor circuit unitn1Drain electrode of (1) and auxiliary switching tube Qn1rAre respectively connected to a power supply VnA positive electrode and a negative electrode of (1); capacitor C in the m-1 stage switch capacitor circuit unitn(m-1)Are respectively connected with a main switching tube Q in the mth stage switched capacitor circuit unitnmDrain electrode of (1) and auxiliary switching tube QnmrA source electrode of (a);
power supply V of the nth switched capacitor circuitnAnd the diode D of the m-th stage switched capacitor circuit unit of the (n-1) th switched capacitor circuit(n-1)mThe cathode of (a) is connected;
the A-type linear amplifier comprises a power tube Q1The voltage regulator, the time delay circuit unit and the voltage division circuit unit, and the power tube Q1One end of the power tube Q is connected with one end of the voltage division circuit unit1The output end of the voltage division circuit unit is connected with a voltage regulator, the other end of the voltage division circuit unit is grounded, the input end of the delay circuit unit is used for inputting reference voltage, the output end of the delay circuit unit is connected with the voltage regulator, and the voltage regulator is connected with a power tube Q1The control end of the controller is connected;
power supply V of the first switched capacitor circuit1Is grounded, and the diode D of the mth stage switched capacitor circuit unit of the nth switched capacitor circuitnmCathode of and power tube Q of A-type linear amplifier1Is connected at the other end, wherein n>2 and is an integer, m>2 and is an integer.
In FIGS. 1 and 2, V1-VnRepresentative of power supply, Q11-QnmRepresents a main switching tube, Q11r-QnmrRepresents an auxiliary switch tube, D11-DnmRepresents a diode, and tau represents a time delay circuit unit; the voltage regulator and the time delay circuit unit are prior art and are not explained here, and the power tube Q1The MOS tube or the triode is adopted, and the voltage division circuit unit is composed of a resistor RuAnd a resistance RdAre connected in series to form the resistor RuOne terminal and a power tube Q1Connected with the other end of the resistor RdIs connected to the voltage regulator, the resistor RdAnd the other end of the same is grounded.
The A-type linear amplifier adopts closed-loop control, and its output voltage is passed through divider resistor Ru、 RdSampling, sampling signal and reference signal vrefComparing signals after passing through the time delay circuit unit tau, and sending the error to a power tube Q of a class A linear amplifier after being regulated by a voltage regulator1A gate electrode of (1).
A control method of a switched capacitor type high-bandwidth envelope tracking power supply circuit is applied to embodiment 1 and embodiment 2 and is based on a reference signal vrefThe method comprises the following steps of generating a plurality of pulses, redistributing and inverting the pulse signals to obtain control signals of a main switching tube and an auxiliary switching tube in a switched capacitor circuit, wherein the specific control method comprises the following steps:
1) by reference signal vrefComparing with m monotonically increasing threshold levels, triggering m fitting pulse signals, wherein the m fitting pulse signals periodically change along with time, and each fitting pulse signal respectively comprises a rising edge and a falling edge in a change period;
2) in m fitting pulse signals, n groups of m fitting pulses in a change period are sequentially taken according to time sequence, and m fitting pulses in any group areThe rising edges of the fitting pulses are independently distributed to a group of main switching tube control signals, namely the rising edges are used as the rising edges of the main switching tube control signals, and the rising edges of m fitting pulses in n groups are respectively and independently distributed to n groups of main switching tube control signals; independently distributing the falling edges of the m fitting pulses in any group to a group of main switching tube control signals, namely, taking the falling edges as the falling edges of the main switching tube control signals until the falling edges of the m fitting pulses in the n groups are respectively and independently distributed to the n groups of main switching tube control signals; thereby obtaining n groups of main switching tube control signals of rising edge and falling edge on different time sequences, namely Qn1、Qn2、……、QnmEach group of main switching tube control signals comprises m pulse signals, and m pulse signals in the n groups of main switching tube control signals are respectively used for being input to the control ends of m main switching tubes in the n switched capacitor circuits to control the on-off of the main switching tubes;
3) m pulse signals in n groups of main switching tube control signals are subjected to the following digital logic relation:
m pulse signals, i.e. Q, in n groups of auxiliary switching tube control signals are obtained by operationn1r、 Qn2r、……、QnmrAnd the control end is used for inputting the control end of m auxiliary switch tubes in the n switched capacitor circuits to control the on-off of the auxiliary switch tubes.
In step 2), in order to ensure that the pulse widths of m pulse signals in each group of control signals are close in the same change period, under the condition that the rising edges of the m pulse signals are independently distributed, the falling edges of m fitting pulses in any group are independently distributed to a group of main switching tube control signals according to a method that the rising edges are firstly triggered and the falling edges are also firstly triggered.
To better understand the above method, it is illustrated here that fig. 3 shows, by way of reference voltagesSignal vrefComparing with m monotonically increasing threshold levels, triggering m fitting pulse signals, wherein the m fitting pulse signals periodically change along with time, each fitting pulse signal comprises a rising edge and a falling edge in a change period, and the m fitting pulse signals Scmp1～ScmpmIn the method, n groups of m fitting pulses in a change period are taken in sequence according to time sequence, and each group of m fitting pulses is respectively defined as P1Group … …, PxGroup … …, PnAnd (wherein x is 2, 3, … …, n-1), the rising edges of each group of m fitting pulses are defined as P11r、P12r、……、P1mr；……；Px1r、Px2r、……、Pxmr；……；Pn1r、 Pn2r、……、Pnmr(ii) a Defining the falling edges of each group of m fitting pulses as P11f、P12f、……、 P1mf；……；Px1f、Px2f、……、Pxmf；……；Pn1f、Pn2f、……、Pnmf. At Q1group-QnIn the group main switch tube control signal, Q1The rising edge of the drive signals in a group being selectable P1group-PnAny one of the sets rising edge, where P is selected1Rising edge of the group, i.e. P11r、 P12r、……、P1mr(ii) a In the selection of Q1When the falling edge of the driving signal in the group is detected, P is respectively selected for expanding the on-off time of the switch tubeimf、Pi(m-1)f、……、Pi1f(where i is 1, 2, … …, n) corresponds to the rising edge one by one to form Q1The group main switching tube controls signals, namely, pulses with a later switching-on time are ensured, and the switching-off time is also later.
For QxGroup (2): selection of PxRising edge of group as QxSelecting P on the rising edge of the control signal of the group main switch tubeimf、Pi(m-1)f、……、Pi1f(where j is 1, 2, … …, n and j ≠ i) as QxAnd the group main switching tube controls the falling edge of the signal. At this time, the value range of j is further determinedThe waveform of the falling edge can have two modes, which are defined as mode ① and mode ②, respectively, where x is ≦ j ≦ n in mode ①, and 1 is ≦ j in mode ②<x。
The same reasoning can be derived for the other groups of drive signals, where for QnGroup (2): selection of PnRising edge of group as QxRising edge of group main switch tube control signal, at this moment QxThe waveform of the falling edge of the group main switch tube control signal can also have two modes, which are respectively defined as a mode ① and a mode ②, wherein the falling edge of the mode ① is determined as Pnmf、Pn(m-1)f、……、Pn1fThe falling edge of pattern ② is Pkmf、Pk(m-1)f、……、Pk1f(where k ≠ 1, 2, … …, n-1 and k ≠ i, k ≠ j).
By redistributing the rising edge and the falling edge, the main switch tube Q can be obtainedn1～QnmThe control signal (1/n) of the switching frequency is reduced by 1, and m pulse signals in n groups of main switching tube control signals are subjected to the following digital logic relation in order to cooperate with the work of the main switching tube:
m pulse signals, i.e. Q, in n groups of auxiliary switching tube control signals are obtained by operationn1r、 Qn2r、……、QnmrAnd the control end is used for inputting the control end of m auxiliary switch tubes in the n switched capacitor circuits to control the on-off of the auxiliary switch tubes.
Fig. 4 shows the operation mode of the single switched capacitor circuit in embodiment 2, which is described as follows:
modality (a): q11r～Q13rTube conduction, Q11～Q13The tube is turned off, at which time the voltage source V is1Capacitor C11～C13Charging, when reaching steady state, the voltage between two poles of single capacitor is V1. In this case, the cell output voltage may be equivalent to C13Voltage value V at both ends1And in the capacitance C13During the process of supplying power to the load, the capacitor C is connected with13Drop in voltage across, capacitor C12Through diode D1c3And a switching tube Q13rCapacitor C13Charging;
modality (b): q13、Q11r、Q12rTube conduction, Q11、Q12、Q13rThe tube is turned off, at which time the voltage source V is1Capacitor C11、C12Charging, capacitance C13And a voltage source V1The series connection supplies power to the load. The cell output voltage is therefore equal to 2V1And at a voltage source V1And a capacitor C13During the process of supplying power to the load, the capacitor C is connected with13Drop in voltage across, capacitor C11Through diode D1c2、D1c3And a switching tube Q12r、Q13rCapacitor C13Charging, capacitance C12Through diode D1c3And a switching tube Q13rCapacitor C13Charging;
modality (c): q12、Q13、Q11rTube conduction, Q11、Q12r、Q13rThe tube is turned off, at which time the voltage source V is1Capacitor C11Charging, capacitance C11、C12、C13The series connection supplies power to the load. The cell output voltage is thus C11、C12And C13The sum of the voltages at both ends is 3V1And at a voltage source V1Capacitor C11And a capacitor C13During the process of supplying power to the load, the capacitor C is connected with13Drop in voltage across, capacitor C12Through diode D1c3And a switching tube Q13rCapacitor C13Charging;
mode (d): q11、Q12、Q13Tube conduction, Q11r、Q12r、Q13rTube cut-off, capacitor C11、C12、C13And a voltage source V1The series connection supplies power to the load. In this case, the cell output voltage can be equivalent to the input voltage and the capacitor C11、C12And C13The sum of the voltages at both ends is 4V1；
Modality (e): q11r、Q12、Q13Tube conduction, Q11r、Q12r、Q13rThe tube is shut off. At this time, the capacitor C11、C12、C13The series connection supplies power to a load, so that the output voltage of the unit is 3V1；
Mode (f): q11r、Q12r、Q13Tube conduction, Q11、Q12、Q13rThe tube is shut off. At this time, the voltage source V1To the capacitor C11、C12Charging, capacitance C12、C13The series connection supplies power to a load, and the output voltage of the unit can be equivalent to 2V1And in the capacitance C12And a capacitor C13During the process of supplying power to the load, the capacitor C is connected with12Drop in voltage across, capacitor C11Through diode D1c2And a switching tube Q12rCapacitor C12Charging;
modality (g): at this time, the circuit mode is shown as mode (a), and the cell output voltage can be equivalent to 1V1。
The specific examples of the present invention are as follows, with the main performance parameters as follows:
● reference signal vref: 2.4V-4.2V sine wave;
● output voltage vo: 12V-21V sine wave;
● tracking frequency fr：2MHz；
● load resistor RL：25Ω。
From the above description, the switched capacitor circuit of the present invention realizes a high bandwidth envelope tracking power supply with the following advantages:
1. compared with the traditional method, the provided switched capacitor envelope tracking power supply reduces the number of power supply modules, reduces the complexity and cost of a circuit, and improves the efficiency of a system;
2. the switching frequency of the switching tube can realize (1/n) 1 frequency reduction relative to the tracking signal frequency, and the feasibility of the circuit working under the condition of high-frequency tracking signals is improved; meanwhile, the on-off time of the switch tube is effectively expanded, and the reliability of the switch tube in high-frequency work is improved.
Claims (4)
1. A switched capacitor type high-bandwidth envelope tracking power supply circuit is characterized by comprising a step wave voltage generating circuit and an A-type linear amplifier, wherein the step wave voltage generating circuit is formed by connecting n switched capacitor circuits with the same structure in series;
wherein the nth switched capacitor circuit comprises a power supply VnThe circuit comprises a first-stage switched capacitor circuit unit, a second-stage switched capacitor circuit unit, … …, an m-1 stage switched capacitor circuit unit and an m-stage switched capacitor circuit unit; the mth stage switched capacitor circuit unit comprises a main switching tube QnmAuxiliary switch tube QnmrDiode DnmAnd a capacitor CnmThe main switch tube QnmSource electrode, auxiliary switch tube QnmrDrain electrode and capacitor CnmAre connected to each other, the diode DnmAnode and power supply VnThe anode of the diode DnmCathode and capacitor CnmThe other end of the first and second connecting rods is connected;
main switch tube Q in first-stage switch capacitor circuit unitn1Drain electrode of (1) and auxiliary switching tube Qn1rAre respectively connected to a power supply VnA positive electrode and a negative electrode of (1); capacitor C in the m-1 stage switch capacitor circuit unitn(m-1)Are respectively connected with a main switching tube Q in the mth stage switched capacitor circuit unitnmDrain electrode of (1) and auxiliary switching tube QnmrA source electrode of (a);
power supply V of the nth switched capacitor circuitnAnd the diode D of the m-th stage switched capacitor circuit unit of the (n-1) th switched capacitor circuit(n-1)mThe cathode of (a) is connected;
the A-type linear amplifier comprises a power tube Q1The voltage regulator, the time delay circuit unit and the voltage division circuit unit, and the power tube Q1One end of the power tube Q is connected with one end of the voltage division circuit unit1For this end useWhen the power supply is used for supplying power to a load, the output end of the voltage division circuit unit is connected with a voltage regulator, the other end of the voltage division circuit unit is grounded, the input end of the delay circuit unit is used for inputting reference voltage, the output end of the delay circuit unit is connected with the voltage regulator, and the voltage regulator is connected with a power tube Q1The control end of the controller is connected;
power supply V of the first switched capacitor circuit1Is grounded, and the diode D of the mth stage switched capacitor circuit unit of the nth switched capacitor circuitnmCathode of and power tube Q of A-type linear amplifier1Is connected at the other end, wherein n>2 and is an integer, m>2 and is an integer.
2. The switched-capacitor high-bandwidth envelope tracking power supply circuit as claimed in claim 1, wherein the P-th stage switched-capacitor circuit unit is provided with a diode DncPSaid diode DnPCathode and diode DncPCathode and capacitor CnPThe other end of the first and second connecting rods is connected; the diode DncPAnode and main switch tube QnPA drain electrode is connected; wherein m is>＝P>P is an integer equal to 2.
3. The method for controlling the switched capacitor type high-bandwidth envelope tracking power supply circuit according to claim 1 or 2, comprising the following steps:
1) triggering m fitting pulse signals by comparing a reference voltage with m monotonically increasing threshold levels, the m fitting pulse signals periodically changing with time, the m fitting pulse signals respectively including a rising edge and a falling edge in a changing period;
2) in the m fitting pulse signals, sequentially taking n groups of m fitting pulses in a change period according to a time sequence, and independently distributing the rising edges of the m fitting pulses in any group to a group of main switching tube control signals, namely the rising edges of the main switching tube control signals, until the rising edges of the m fitting pulses in the n groups are respectively and independently distributed to the n groups of main switching tube control signals; dropping of m fitted pulses in any groupThe edges are independently distributed to a group of main switching tube control signals, namely the edges are used as the falling edges of the main switching tube control signals, and the falling edges of m fitting pulses in n groups are respectively and independently distributed to n groups of main switching tube control signals; thereby obtaining n groups of main switching tube control signals of rising edge and falling edge on different time sequences, namely Qn1、Qn2、……、QnmEach group of main switching tube control signals comprises m pulse signals, and m pulse signals in the n groups of main switching tube control signals are respectively used for being input to the control ends of m main switching tubes in the n switched capacitor circuits to control the on-off of the main switching tubes;
3) m pulse signals in n groups of main switching tube control signals are subjected to the following digital logic relation:
……
m pulse signals, i.e. Q, in n groups of auxiliary switching tube control signals are obtained by operationn1r、Qn2r、……、QnmrAnd the control end is used for inputting the control end of m auxiliary switch tubes in the n switched capacitor circuits to control the on-off of the auxiliary switch tubes.
4. The method according to claim 3, wherein in step 2), in order to ensure that the pulse widths of the m pulse signals in each group of control signals are close in the same variation period, in the case that the rising edges of the m pulse signals have been independently allocated, the falling edges of the m fitting pulses in any group are independently allocated to a group of main switching tube control signals according to a method that the rising edges are triggered first and the falling edges are triggered first.
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