CN114865894B - Method for generating control signal of switch converter in envelope tracking power supply - Google Patents
Method for generating control signal of switch converter in envelope tracking power supply Download PDFInfo
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
- H02M3/1584—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load with a plurality of power processing stages connected in parallel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a method for generating a control signal of a switch converter in an envelope tracking power supply, which comprises the steps of extracting valley values and time point distribution information thereof to generate a low-bandwidth switch converter standard to realize PWM control according to the characteristics of envelope peak values, valley values and corresponding time points so as to track the power spectrum low-frequency components of envelope signals; providing a high bandwidth switching converter control signal according to the distribution characteristics of adjacent valley points and peak points, switching on the switching tube at the time near the valley or the valley, and switching off the switching tube at the time near the peak or the peak; meanwhile, according to the slope relation between the adjacent valley point and the peak point, the high-bandwidth switching converter can select filter inductors with different inductance values to provide different current rising rates. The method can greatly reduce the calculated amount of control hardware, reduce the switching loss and effectively improve the power supply efficiency of the envelope tracking power supply radio frequency power amplifier.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a method for generating a control signal of a switch converter in an envelope tracking power supply.
Background
The Envelope Tracking (ET) technique is one of the most effective methods currently used to improve the efficiency of a radio frequency power amplifier. The technology greatly reduces energy loss while ensuring undistorted transmission of Radio Frequency (RF) signals, conforms to the concept of carbon neutralization, and is a technology researched more at present.
In the envelope tracking technology, a linear amplifier and switching converters with various bandwidths are mixed to form a mainstream structure, wherein the low-bandwidth switching converter supplements low-frequency component energy, the high-bandwidth switching converter is combined to provide high-frequency component energy, and the linear amplifier supplements tracking difference part to ensure the linearity of an output waveform.
The prior patent application CN113556025a discloses a method and a system for generating a reference signal of a switching converter in an envelope tracking power supply, which are implemented by processing an RF envelope signal through a filter, and then taking a constant reference value according to different set time intervals to generate a corresponding reference signal in the switching converter, and determining the obtained time interval and the corresponding constant reference value by using the RF envelope signal and the characteristics of a switching converter, so as to improve the power supply efficiency of a radio frequency power amplifier of the envelope tracking power supply to a certain extent and reduce the efficiency of required hardware calculation resources compared with other prior art; however, in practical use, it is found that the algorithm of the method is complicated, a filter and a subtractor need to be introduced, digital filtering calculation and weighted average calculation of all envelope signals are performed through an FPGA, the hardware work calculation amount is large, relatively large hardware calculation resources are consumed, and the cost is high.
Disclosure of Invention
In order to solve the technical problems, the invention provides a new method for generating a control signal of a switching converter in an envelope tracking power supply on the basis of an ET technology parallel architecture, and the method only utilizes key information such as peak values, valley values and corresponding time points thereof, and adopts a new reference value generation algorithm and a control algorithm of the switching converter, thereby further reducing the calculation amount of hardware work, reducing the loss caused by the hardware work, and further improving the tracking precision and efficiency.
The invention relates to a method for generating a control signal of a switch converter in an envelope tracking power supply, which adopts the technical scheme that: the generation method comprises the following steps:
according to envelope valley point distribution and information of corresponding time points, sending the generated reference value to a PWM control signal generation module through a reference value generation module to obtain a low-bandwidth control signal for controlling a low-bandwidth switching converter;
according to the information of the adjacent valley point and peak point of the envelope and the time point of the envelope, the state information generated is sent to a high bandwidth control signal generation module through a state judger to obtain a high bandwidth control signal for controlling a high bandwidth switch converter;
when the envelope signal is in a rising state, the slope K of a connecting line between a valley point and a peak point is judged according to a key information string containing the envelope peak value, the valley value and the corresponding time point, the slope K obtained through calculation is sent to a filter inductor control signal module through a slope calculator, and after a gating signal of a filter inductor is obtained, the gating signal is sent to a corresponding filter inductor gating switch for control.
Further, according to the envelope valley point distribution and the information of the corresponding time point, the average value or the multiple related to the average value of a plurality of valley points in a defined time period or the peak value of the valley point in a time period is obtained and used as the control reference value of the low-bandwidth switching converter; the duration of the defined time period is not less than the response time of the output voltage establishment of the low-bandwidth switching converter, and the starting point and the ending point of the defined time period are formed by a peak point or a valley point; namely, the starting point and the ending point are composed of: two peak points or two valley points or one peak point and one valley point.
Further, the method for generating the reference value according to the valley point includes, but is not limited to, the following three methods:
(1) Taking two different peak points of the envelope as a starting point and an ending point of a reference value, and taking a weighted average value of a valley value between two peak values as the amplitude of the reference value to obtain a constant reference value;
(2) Taking two different valley points of the envelope line as a starting point and an ending point of the reference value, and taking a weighted average value of the valley values between the two valley values as the amplitude of the reference value to obtain a constant reference value;
(3) And taking a valley point and a peak point of the envelope as a starting point and an ending point of the reference value, and taking a weighted average of the valleys between the two valley points and the peak point as the amplitude of the reference value to obtain the constant reference value.
Further, the state judger judges whether the current envelope signal is in a rising state from valley to peak or in a falling state from peak to valley, provides a high bandwidth switching converter control signal according to the distribution characteristics of adjacent valley points and peak points, provides a high level signal for turning on the switch tube at a time near the valley or valley, and provides a low level signal for turning off the switch tube at a time near the peak or peak.
Further, when the envelope signal is in a rising state, the slope K of the line connecting the valley point and the peak point is judged according to the key information string containing the envelope peak value, the valley value and the corresponding time point,
in the formula, V peak Is the magnitude of the peak, V valley Magnitude of valley, t peak Is the relative time value of the peak, t valley Relative time values for the valleys.
Further, according to the difference of the slope K, the high-bandwidth switching converter selects filter inductors with different inductance values; when the slope K value is larger than a certain preset threshold value M, selecting a filter inductor with a lower inductance value to provide a faster current change rate; when the value of K is smaller than a certain preset threshold value M, the filter inductor with larger inductance value is selected to provide a slower current change rate.
Furthermore, when the envelope signal is in a falling state, if the time length between the peak point and the adjacent valley point is greater than a predetermined threshold T, a short time T will elapse 1 Then, the high-bandwidth switching converter is given a time length t again 2 The high level signal of (a) causes the high bandwidth switching converter to be turned back on, providing current, supplementing the difference from the envelope signal, where t 1 +t 2 <T。
The invention has the beneficial effects that: compared with the prior art that filtering calculation and average calculation of all envelope signals are performed by adopting FPGA hardware, the problems that more hardware logic resources are used and the calculation amount is large are solved; the invention provides a novel method for generating a control signal of a switching converter in an envelope tracking power supply based on envelope peak values, valley values and key information of corresponding time points of the envelope peak values and the valley values, the method is simple in working principle, no filtering calculation is carried out on the generation of reference values, weighting calculation is carried out on the valley values only, the calculation times are few, the selection of filtering inductors is added into a hardware circuit, and the calculation amount is obviously reduced compared with the prior art; the output power of the linear amplifier can be effectively reduced, the workload of hardware is greatly reduced, and the efficiency of the radio frequency power amplifier envelope tracking power supply system is improved.
Drawings
FIG. 1 is a schematic diagram of a parallel architecture of a switching converter and linear amplifier combination using two bandwidths;
FIG. 2 is a schematic flow chart of a method for generating a control signal for a switching converter;
FIG. 3 is a diagram illustrating the rising and falling states of an envelope signal;
FIG. 4 is a diagram of a first generation of a low bandwidth switching converter reference based on valley, peak and corresponding time point information;
FIG. 5 is a diagram of a second generation of a low bandwidth switching converter reference based on valley, peak and corresponding time point information;
FIG. 6 is a schematic diagram of a generated high bandwidth switching converter control signal based on a key information string containing envelope peaks, valleys and their corresponding time points;
fig. 7 is a diagram of a filter inductance selection control signal generated based on a key information string containing envelope peaks, valleys and their corresponding time points.
Detailed Description
In order that the present invention may be more readily and clearly understood, a more particular description of the invention briefly described above will be rendered by reference to specific embodiments that are illustrated in the appended drawings.
Example one
FIG. 1 shows an embodiment of a parallel architecture implemented using two switching converters of different bandwidths in combination with a linear amplifier, where (1) in FIG. 1 uses portions of a low-bandwidth switching converter and a high-bandwidth switching converter implemented as buck converters, Q 1 To Q 5 Are all switch tubes, D is a freewheeling diode, L 1 、L 2 And L 3 Are all filter inductors, wherein two filter inductors of the high-bandwidth switching converter are necessary and only one can be gated, i 1 Current supplied to low bandwidth converters i 2 And i 3 Current supplied to high-bandwidth converters i sum The sum of the currents supplied by the two converters; in fig. 1, (2) is a linear amplifier part, a load voltage is sampled and then is sent to a voltage regulator, a difference value is sent to an in-phase proportional amplifier after being compared with an envelope signal, and a linear current i is carried out through an NFET and a PFET of an output stage power tube 4 Supplement of (a), i 4 And i sum Adding to obtain a load current i o Through a load resistor R Ld Then obtaining the load voltage V o I.e. the envelope tracks the output voltage of the power supply system.
Based on an ET technology parallel architecture, the embodiment of the invention provides a method for generating a control signal of a switching converter in an envelope tracking power supply, which comprises the following steps:
and according to the distribution of the valley points of the envelope curve and the information of the corresponding time points, calculating the average value of a plurality of valley points in a defined time period, or the multiple related to the average value, or the peak value of the valley point in a time period as the control reference value of the low-bandwidth switching converter. The reference value can be used for generating a PWM control signal and providing low-frequency component energy in a power spectrum of an envelope signal of the radio frequency power amplifier.
And providing a high-bandwidth switching converter turn-on signal at the valley point moment and a high-bandwidth switching converter turn-off signal at the peak point moment according to information of valley points, peak points and time points adjacent to the envelope lines.
According to the difference of the slope K, the high-bandwidth switching converter selects filter inductors with different inductance values. When the slope K value is larger than a certain preset threshold value M, selecting a filter inductor with a lower inductance value to provide a faster current change rate; when the value of K is smaller than a certain preset threshold value M, the filter inductor with larger inductance value is selected to provide a slower current change rate.
When the envelope signal is in a descending state, if the time length between the peak point and the adjacent valley point is greater than a preset threshold value T, a short time T will pass 1 Then, the high-bandwidth switching converter is given a time length t again 2 The high level signal of (a) causes the high bandwidth switching converter to be turned back on to provide current to supplement the difference with the envelope signal. Wherein, t 1 、t 2 The relation to T is T 1 +t 2 <T。
The foregoing switching converter control method is described in detail below with reference to specific examples.
Fig. 2 is a schematic diagram of the entire control flow. And the reference value generation module sends the generated reference value to the PWM control signal generation module to obtain a control signal of the low-bandwidth switch converter and then sends the control signal to the low-bandwidth switch converter for control. And the state judger sends the generated state information to the high-bandwidth control signal generation module, and the control signal of the high-bandwidth switch converter is obtained and then is sent to the high-bandwidth switch converter for control. And the slope calculator sends the calculated slope K to the filter inductor control signal generation module, and sends the obtained gating signal of the filter inductor to a corresponding filter inductor gating switch for control.
Fig. 3 is a schematic diagram of the state of an envelope signal obtained based on the peak value, the valley value, and the information corresponding to the time point of the envelope, the envelope signal being in a monotonically increasing state when the envelope transitions from the valley value to the peak value, and being in a monotonically decreasing state when the envelope transitions from the peak value to the valley value.
Example 1: fig. 4 is a schematic diagram of an embodiment of a reference generation method of a low-bandwidth switching converter based on envelope peak and valley values and their corresponding time point information distribution characteristics. In the method, peak points are used as a starting point and an ending point of a reference value, a shortest step length and an amplitude threshold value are set, the duration of the shortest step length is not less than the response time of the output voltage establishment of the low-bandwidth switching converter, a valley value which is greater than the shortest step length and less than the amplitude threshold value is subjected to weighted average calculation, and the obtained value is used as a constant reference value. The reference value will be used to provide a corresponding control signal to the low bandwidth switching converter.
Example 2: fig. 5 is a diagram illustrating a second reference generation manner of the low-bandwidth switching converter based on the peak and valley values of the envelope and the information distribution characteristics of the corresponding time points. In the method, valley points are used as a starting point and an ending point of a reference value, a shortest step length and an amplitude threshold value are set, the duration of the shortest step length is not less than the response time of the output voltage establishment of the low-bandwidth switching converter, weighted average calculation is carried out on the valley values which are greater than the shortest step length and less than the amplitude threshold value, and the obtained numerical value is used as a constant reference value. The reference value is used to provide a corresponding control signal to the high bandwidth switching converter.
Example 3: fig. 6 is a schematic diagram of a high-bandwidth switching converter control signal generated based on envelope peak and valley values and their corresponding time point information distribution characteristics. The generation of the control signal is adapted to the state diagram of fig. 2, when the former value of the key information string is smaller than the latter value, the state judger can obtain that the envelope signal is in the rising state, and after the state information is transferred to the control signal generation module, a high level signal is generated and provided for the high bandwidth switching converter to conduct the switching tube. When the former value of the key information string is larger than the latter value, the state judger can be used for obtaining that the envelope signal is in a descending state, and after the state information is transmitted to the control signal generation module, a low level signal is generated and provided for the high-bandwidth switch converter to close the switch tube. On the basis, the time length between the peak value and the valley value is judged through the key information string, and when the time length is larger than a preset threshold value T, a short time T passes 1 Then, the high-bandwidth switching converter is given a cycle t again 2 The high level signal of (a) causes the high bandwidth switching converter to be turned back on to provide current to supplement the difference with the envelope signal. Wherein, t 1 、t 2 The relation to T is T 1 +t 2 <T。
Example 4: fig. 7 is a filter inductance selection control signal generated based on envelope peak and valley values and their corresponding time point information distribution characteristics. Filter inductor L in FIG. 7 2 The filter inductor with small inductance value, filter inductor L 3 The filter inductance is small in inductance value. Calculating the slope of the rising envelope line through the key information string, and selecting the filter inductor L with smaller inductance value when the slope is larger than a preset threshold value 2 The parallel-type structure is added to provide a faster current change rate; when the slope is smaller than a preset threshold value, selecting a filter inductor L with a larger inductance value 3 In a parallel configuration to provide a slower rate of current change.
Compared with the prior art, the method for generating the control signal of the switch converter in the envelope tracking power supply has the following technical effects by adopting the technical scheme: the control strategy has simple working principle, calculation control is carried out according to the key information string containing envelope peak values, valley values and corresponding time points, a new research direction is developed, the calculation workload of hardware is reduced, and the efficiency of the parallel radio frequency power amplifier envelope tracking power supply is improved.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (7)
1. A method for generating a control signal of a switching converter in an envelope tracking power supply is characterized in that the method comprises the following steps:
according to the distribution of the envelope valley points of the radio frequency signal and the information of the corresponding time points, the generated reference value is sent to the PWM control signal generation module through the reference value generation module to obtain a low-bandwidth control signal for controlling the low-bandwidth switch converter;
according to information of adjacent valley points and peak points of an envelope curve of the radio frequency signal and time points of the envelope curve of the radio frequency signal, the generated state information is sent to a high bandwidth control signal generating module through a state judger to obtain a high bandwidth control signal for controlling a high bandwidth switch converter;
when the envelope signal is in a rising state, judging the slope K of a connecting line between a valley point and a peak point according to a key information string containing the envelope peak value, the valley value and the corresponding time point, sending the slope K obtained by calculation to a filter inductor control signal module through a slope calculator, obtaining a gating signal of a filter inductor, and then sending the gating signal to a corresponding filter inductor gating switch for control;
wherein, the low bandwidth switch converter is connected with the high bandwidth switch converter in parallel, and the filter inductance L of the low bandwidth switch converter 1 Filter inductor L of non-filter inductor gating switch and high-bandwidth switch converter 2 And L 3 Are respectively provided withCorresponding and filtering inductor gating switch Q 4 、Q 5 In series, gating switch Q by a filter inductor 4 Or Q 5 To control the filter inductance L 2 And L 3 Whether to strobe.
2. The method for generating the control signal of the switching converter in the envelope tracking power supply according to claim 1, wherein according to the distribution of the envelope valley points and the information of the corresponding time points, the average value of a plurality of valley points in a defined time period or the multiple related to the average value or the peak value of the valley point in a time period is obtained as the control reference value of the low-bandwidth switching converter; the duration of the defined time period is not less than the response time of the output voltage establishment of the low-bandwidth switching converter, and the starting point and the ending point of the defined time period are formed by a peak point or a valley point; namely, the starting point and the ending point are composed of: two peak points or two valley points or one peak point and one valley point.
3. The method for generating the control signal of the switching converter in the envelope tracking power supply according to claim 1, wherein the method for generating the reference value according to the valley point comprises the following three methods:
(1) Taking two different peak points of the envelope as a starting point and an ending point of a reference value, and taking a weighted average value of a valley value between two peak values as the amplitude of the reference value to obtain a constant reference value;
(2) Taking two different valley points of the envelope line as a starting point and an ending point of the reference value, and taking a valley weighted average value between the two valleys as the amplitude of the reference value to obtain a constant reference value;
(3) And taking a valley point and a peak point of the envelope as a starting point and an ending point of the reference value, and taking a weighted average value of the valley value between the valley point and the peak point as the amplitude of the reference value to obtain a constant reference value.
4. The method as claimed in claim 1, wherein the state determiner determines whether the current envelope signal is in a rising state from a valley to a peak or in a falling state from a peak to a valley, and provides the high bandwidth switching converter control signal according to the distribution characteristics of adjacent valley points and peak points, that is, provides the high level signal for turning on the switching tubes of the high bandwidth switching converter at a time near the valley or the valley, and provides the low level signal for turning off the switching tubes of the high bandwidth switching converter at a time near the peak or the peak.
5. The method of claim 4, wherein when the envelope signal is in a rising state, the slope K of the line connecting the valley point and the peak point is determined according to a key information string including the peak value and the valley value of the envelope and their corresponding time points,
in the formula, V peak Is the magnitude of the peak, V valley Magnitude of valley, t peak Is the relative time value of the peak, t valley Relative time values for the trough.
6. The method for generating the control signal of the switching converter in the envelope tracking power supply according to claim 5, wherein the high-bandwidth switching converter selects filter inductors with different inductance values according to different slopes K; when the slope K value is larger than a preset threshold value M, selecting a filter inductor with a lower inductance value to provide a faster current change rate; when the value of K is smaller than a preset threshold value M, the filter inductor with a larger inductance value is selected to provide a slower current change rate.
7. The method of claim 4, wherein the peak point and the adjacent valley point are generated when the envelope signal is in a falling stateWhen the time length is greater than a preset threshold value T, a short time T passes 1 Then, the high-bandwidth switching converter is given a time length t again 2 The high level signal of (a) causes the high bandwidth switching converter to be turned back on, providing current, supplementing the difference from the envelope signal, where t 1 +t 2 <T。
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| CN202210598112.6A CN114865894B (en) | 2022-05-30 | 2022-05-30 | Method for generating control signal of switch converter in envelope tracking power supply |
| PCT/CN2022/127327 WO2023159988A1 (en) | 2022-02-24 | 2022-10-25 | Control signal generation method for switch converter in envelope tracking power source, and storage medium and electronic apparatus |
| US18/321,723 US20230291357A1 (en) | 2022-02-24 | 2023-05-22 | Method for predicting envelope features and generating switching converter control signal in envelope tracking power supply, storage medium, and electronic device |
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| TWI474590B (en) * | 2012-12-26 | 2015-02-21 | Univ Nat Taiwan | Control circuit for reducing current error of output of power converter and control method thereof |
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| CN108322047A (en) * | 2018-02-11 | 2018-07-24 | 南京航空航天大学 | A kind of the envelope tracking power supply and control method of hysteretic loop current control |
| CN110620397A (en) * | 2018-06-19 | 2019-12-27 | 国网能源研究院有限公司 | Peak regulation balance evaluation method for high-proportion renewable energy power system |
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