An input source multiplexing relay charging parallel type envelope tracking power supply

Abstract

This invention discloses a relay-charge parallel envelope tracking power supply with multiplexed input sources, comprising: a stepped wave voltage generation circuit, an AB-class linear amplifier, a feedforward control circuit, and a pulse edge distribution unit. It improves upon conventional parallel envelope tracking power supplies by using a relay-charge switched-capacitor converter to generate a stepped wave voltage based on the modulated wave voltage output from the feedforward control circuit. By integrating a level providing unit and a level gating unit, it simultaneously reduces the switching frequency relative to the reference signal frequency l / k, thereby reducing switching losses. This facilitates further reducing the switching frequency while maintaining tracking bandwidth, simplifying the circuit structure. Multiplexing the input source of the stepped wave voltage generation circuit reduces linear amplifier losses and input power, further improving the overall circuit efficiency.

Description

Technical Field

[0001] This invention relates to the field of wireless communication, and more particularly to a relay-charging parallel envelope tracking power supply with multiplexed input sources, belonging to the category of communication and power conversion. Background Technology

[0002] Mobile communication technology has undergone five generations of development over the past half-century. Around 2010, the fourth-generation mobile communication system, based on the Long Term Evolution (LTE) standard, achieved a breakthrough, with uplink and downlink data transmission rates reaching 50Mbps and 100Mbps respectively, enabling high-quality image, audio, and video processing and transmission. In recent years, the rapid development of the fifth-generation mobile communication system has further improved people's living standards, and mobile communication technology has undergone a historic revolution. While mobile communication has driven human civilization and technological progress, energy consumption has also become an increasingly serious problem.

[0003] Starting with second-generation mobile communication systems, digital modulation methods were widely used to obtain more data information within the same frequency band of the radio frequency (RF) input signal. However, in 2G systems, the envelope amplitude of the RF signal remained constant. Under constant envelope conditions, high efficiency could be achieved by simply using a nonlinear power amplifier (NLPA) powered by constant voltage to amplify the RF signal.

[0004] With the development of modulation technology, in order to achieve higher transmission rates and spectrum utilization, the amplitude of the RF input signal is also modulated in 3G and 4G, resulting in an irregular and arbitrarily changing envelope shape. To ensure high-fidelity data transmission at high speeds, a linear power amplifier (LPA) with high linearity is typically used to amplify the RF signal. When a constant voltage power supply is used, a large voltage difference exists between the supply voltage and the RF envelope. When the load current flows through this voltage, it causes significant power loss, resulting in low LPA efficiency. High bandwidth and high peak-to-average power ratio (PAPR) of the RF envelope are important characteristics of 5G mobile communication systems. If the LPA constant voltage power supply method continues to be used, the overall system efficiency will be further reduced.

[0005] For the non-constant envelope of modern mobile communications, in order to ensure the high linearity requirement during power amplification, a constant-voltage power supply LPA, which is easy to operate and implement, is usually used. However, the average efficiency of the LPA in this way gradually deteriorates as the PAPR of the RF signal increases. If a variable amplitude voltage that tracks the envelope of the RF input signal in real time can be provided to the PA, the PA can always be near the maximum efficiency operating point, the voltage difference between its supply voltage and the RF envelope will be greatly reduced, and the system efficiency will be significantly improved.

[0006] Currently, there are three main methods to achieve high-efficiency operation of power amplifiers (PAs): Doherty technology, Envelope Elimination and Restoration (EER) technology, and Envelope Tracking (ET) technology. Doherty technology requires the coordinated operation of primary and secondary power amplifiers, resulting in higher costs and lower operating bandwidth. EER technology uses a nonlinear power amplifier and requires the output voltage of the envelope restoration stage to perfectly match the amplitude of the input signal's envelope, placing more stringent demands on the power amplifier's power supply. In ET technology, the envelope output voltage tracks the RF reference signal and is slightly higher than the RF reference signal's envelope. The power supply requirements for the PA are less stringent than in EER technology; therefore, ET technology has better application prospects and implementation methods.

[0007] Currently, common ET power supplies typically employ a parallel connection of a switching converter and a linear amplifier to achieve a high linearity output signal. Traditional parallel envelope tracking power supplies mostly use Buck converters or a stepped fitting structure composed of a level-providing unit and a level-gating unit for the switching converter section. When tracking high-frequency and high-PAPR RF reference signals, the Buck converter requires a switching frequency 5 to 10 times the RF reference signal frequency, resulting in significant switching losses. While the stepped fitting structure reduces the switching frequency to twice the RF reference signal frequency, it requires multiple Buck converters as level-providing units, increasing system complexity and causing issues with narrow pulses failing to fully turn on high-PAPR signals, leading to low efficiency of the ET power supply when dealing with high-bandwidth, high-PAPR signals. Existing relay-charged switched-capacitor structures are only suitable for series-based ET power supplies, lacking feedforward control and unable to adapt to parallel-based ET power supplies in average current control mode. During high-power, high-bandwidth tracking, the regulating transistor experiences significant stress, impacting the ET power supply's efficiency. Summary of the Invention

[0008] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0009] In view of the aforementioned existing problems, the present invention is proposed.

[0010] Therefore, the technical problem solved by this invention is to propose a relay-charged parallel envelope tracking power supply with multiplexed input sources, further reducing the switching frequency of the switching converter, introducing feedforward control to the relay-charged switched capacitor converter, reducing the system complexity of the stepped wave voltage generation circuit of the parallel envelope tracking power supply, and introducing the right transistor of the AB class linear amplifier into the input source of the stepped wave voltage generation circuit, thereby reducing the voltage across the right transistor and reducing the output current of the input source of the stepped wave voltage generation circuit, further improving the efficiency of the ET power supply.

[0011] To solve the above-mentioned technical problems, the present invention proposes the following technical solution: a stepped wave voltage generating circuit, an AB class linear amplifier, a feedforward control circuit, and a pulse edge distribution unit.

[0012] As a preferred embodiment of the relay-charging parallel envelope tracking power supply with input source multiplexing of the present invention, it further includes: the stepped wave voltage generating circuit includes an input source V in1 A single-supply input relay-charged switched-capacitor multilevel converter consisting of capacitors and switching transistors; the Class AB linear amplifier includes an input source V in2 A pair of complementary power transistors, a power supply providing the bias voltage for the power transistors, a sampling circuit, and a voltage regulator; the stepped-wave voltage generator circuit is connected in parallel with the Class AB linear amplifier, and the collector of the right transistor T2 of the Class AB linear amplifier is connected to the input source V of the stepped-wave voltage generator circuit. in1 The positive terminal is connected through a unidirectional diode; the feedforward control circuit performs feedforward control on the current sampling result after the load voltage sampling signal is processed by proportional-differential operation, converts the current sampling signal into a modulated wave voltage, compares the modulated wave voltage with the threshold level to generate a pulse signal and outputs it to the pulse edge distribution unit; the pulse edge distribution unit distributes the pulse signal generated by the feedforward control circuit to each switching transistor according to the principle that the branch triggered by the rising edge is also triggered by the falling edge first, forming a stepped wave voltage.

[0013] As a preferred embodiment of the relay-charging parallel envelope tracking power supply with input source multiplexing of the present invention, it further includes: the stepped-wave voltage generating circuit is a single-supply input relay-charging switched-capacitor multilevel converter. This converter is powered by a single DC power input V. in1 m capacitors C1, C2, ..., C m-1 C BS It consists of m main switching transistors, m auxiliary switching transistors, and m additional switching transistors, wherein when the main switching transistor Q of a certain path... i When (i = 1, 2, ..., m) is turned on, the corresponding auxiliary switch Q in (i = 1, 2, ..., m) and additional switch Q is (s=1,2,...,m) is closed, and the capacitance C of the corresponding branch is... i Discharge causes the output voltage of the stepped-wave voltage generator circuit to increase accordingly; when the main switch Q of a certain path... i When (i = 1, 2, ..., m) is turned off, the corresponding auxiliary switch Q in (i = 1, 2, ..., m) and additional switch Q is (s=1,2,...,m) is turned on, and the capacitance C of the corresponding branch is... i As the circuit charges, the output voltage of the stepped wave voltage generator decreases accordingly.

[0014] As a preferred embodiment of the relay-charged parallel envelope tracking power supply with input source multiplexing of the present invention, it further includes: the collector of the right tube T2 of the class AB linear amplifier and the input source V of the stepped wave voltage generation circuit. in1 The positive terminal is connected via a unidirectional diode. The anode of the diode is connected to the collector of the right transistor, and the cathode is connected to the positive terminal of the input source. The input source of the stepped-wave voltage generator circuit supplies power to both the relay-charge switched-capacitor converter and the right transistor T2 of the Class AB linear amplifier, reducing the voltage drop across T2. The current flowing through T2 returns to the positive terminal of the input source through the unidirectional diode, charging the capacitor in the stepped-wave voltage generator circuit along with the input source, thus reducing the input source voltage V. in1 The output current.

[0015] As a preferred embodiment of the relay-charging parallel envelope tracking power supply for input source multiplexing in this invention, it further includes: a modulated wave voltage generated by a feedforward control circuit, which, after being compared with a corresponding threshold level, generates rising and falling edge pulse signals; these signals are then distributed to m main switching transistors via a pulse edge distribution unit, reducing the switching frequency of the transistors to 1 / k times the tracking signal frequency, forming a stepped wave voltage, which is then distributed to inductor L. rAfter filtering, the stepped-wave voltage generator circuit fits the output current as the load R in the form of a current source. Ld The power supply circuit generates a stepped-wave voltage that produces a voltage level that is higher than the maximum load voltage and a voltage level that is lower than the minimum load voltage.

[0016] The beneficial results of this invention: Compared with a general envelope tracking power supply, the relay-charged parallel envelope tracking power supply with input source multiplexing uses a relay-charged switched capacitor converter to provide different amplitude levels to fit the load current. It integrates the level providing unit and level gating unit of a traditional stepped fitting envelope tracking power supply, reducing system complexity. In the parallel architecture, the modulated wave voltage output from the feedforward control circuit is distributed to the switching transistors of each branch through a pulse edge distribution unit. This is a fixed-frequency modulation with a fixed tracking ratio, allowing for more accurate system parameter design compared to hysteresis control. The pulse edge distribution unit ensures full turn-on of each switching transistor when tracking high-bandwidth signals, improving system reliability. Simultaneously, the input source V of the stepped wave voltage generation circuit... in1 Connecting it to the right transistor T2 of the Class AB linear amplifier reduces both the voltage across the right transistor T2 and the input source V of the stepped-wave voltage generator circuit. in1 The output current is used to achieve truly high-efficiency tracking. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0018] Figure 1 A circuit structure and control logic diagram of a relay-charging parallel envelope tracking power supply with input source multiplexing provided in one embodiment of the present invention;

[0019] Figure 2 A modulation voltage waveform v of a relay-charged parallel envelope tracking power supply with input source multiplexing provided in one embodiment of the present invention when tracking a sine wave signal. c Pulse generation, the drive signal waveform after pulse edge distribution, and the voltage v of the stepped wave voltage generation circuit. mul Schematic diagram;

[0020] Figure 3 The linear amplifier output current i of a relay-charged parallel envelope tracking power supply with input source multiplexing provided in one embodiment of the present invention when tracking a 1MHz sine wave signal. linThe output current i of the stepped wave voltage generator circuit after inductor filtering sw Load current i o The voltage V of the stepped wave voltage generator circuit mul The reference signal after 10x amplification is 10V. env and load voltage ν o A waveform diagram;

[0021] Figure 4 An embodiment of the present invention provides a relay-charged parallel envelope tracking power supply with input source multiplexing, wherein the load voltage V is [missing information] when tracking a 1MHz sine wave signal. o The voltage v across the right transistor of a Class AB linear amplifier T2 A waveform diagram. Detailed Implementation

[0022] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0023] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0024] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0025] This invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of this invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this invention. In actual fabrication, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0026] Furthermore, in the description of this invention, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are used solely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. In addition, the terms "first," "second," or "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" in this invention should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; similarly, they can refer to mechanical connections, electrical connections, or direct connections, or indirect connections through an intermediate medium, or internal connections between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0027] Example 1

[0028] Reference Figure 1 As an embodiment of the present invention, a relay-charging parallel envelope tracking power supply with input source multiplexing is provided, comprising:

[0029] The system includes a stepped-wave voltage generator circuit, an AB-class linear amplifier, a feedforward control circuit, and a pulse edge distribution unit. The stepped-wave voltage generator circuit includes an input source V. in1 A single-supply input relay-charged switched-capacitor multilevel converter consisting of capacitors and switching transistors; an AB-class linear amplifier including input source V in2 A pair of complementary power transistors, a power supply providing the bias voltage for the power transistors, a sampling circuit, and a voltage regulator; a stepped-wave voltage generator circuit is connected in parallel with an AB-class linear amplifier, and the collector of the right transistor T2 of the AB-class linear amplifier is connected to the input source V of the stepped-wave voltage generator circuit. in1 The positive terminal is connected through a unidirectional diode; the feedforward control circuit performs feedforward control on the current sampling result after the load voltage sampling signal is processed by proportional-differential operation, converts the current sampling signal into a modulated wave voltage, compares the modulated wave voltage with the threshold level to generate a pulse signal and outputs it to the pulse edge distribution unit; the pulse edge distribution unit distributes the pulse signal generated by the feedforward control circuit to each switch according to the principle that the branch triggered by the rising edge is also triggered by the falling edge first, forming a stepped wave voltage.

[0030] Specifically, the stepped-wave voltage generation circuit is a single-supply input relay-charged switched-capacitor multilevel converter. This converter is powered by a single DC power input V. in1 m capacitors C1, C2, ..., C m-1 C BSIt consists of m main switching transistors, m auxiliary switching transistors, and m additional switching transistors, wherein when the main switching transistor Q of a certain path... i When (i = 1, 2, ..., m) is turned on, the corresponding auxiliary switch Q in (i = 1, 2, ..., m) and additional switch Q is (s=1,2,...,m) is closed, and the capacitance C of the corresponding branch is... i Discharge causes the output voltage of the stepped-wave voltage generator circuit to increase accordingly; when the main switch Q of a certain path... i When (i = 1, 2, ..., m) is turned off, the corresponding auxiliary switch Q in (i = 1, 2, ..., m) and additional switch Q is (s=1,2,...,m) is turned on, and the capacitance C of the corresponding branch is... i As the circuit charges, the output voltage of the stepped wave voltage generator decreases accordingly.

[0031] The collector of the right transistor T2 in the further AB class linear amplifier is connected to the input source V of the stepped-wave voltage generator circuit. in1 The positive terminal is connected via a unidirectional diode. The anode of the diode is connected to the collector of the right transistor, and the cathode is connected to the positive terminal of the input source. The input source of the stepped-wave voltage generator circuit supplies power to both the relay-charge switched-capacitor converter and the right transistor T2 of the Class AB linear amplifier, reducing the voltage drop across T2. The current flowing through T2 returns to the positive terminal of the input source through the unidirectional diode, charging the capacitor in the stepped-wave voltage generator circuit along with the input source, thus reducing the input source voltage V. in1 The output current.

[0032] The modulated voltage generated by the feedforward control circuit is compared with the corresponding threshold level to generate rising and falling pulse signals. These signals are then distributed to the m main switching transistors via a pulse edge distribution unit, reducing the switching frequency of the transistors to 1 / k times the tracking signal frequency, thus forming a stepped voltage. This voltage is then passed through inductor L. r After filtering, the stepped-wave voltage generator circuit fits the output current as the load R in the form of a current source. Ld The power supply circuit generates a stepped-wave voltage that produces a voltage level that is higher than the maximum load voltage and a voltage level that is lower than the minimum load voltage.

[0033] One of the key performance parameters of this embodiment is:

[0034] DC voltage input source V in1 =7.5V, V in2 =30V;

[0035] Voltage reference signal V env=1~2.6V sine wave;

[0036] Load voltage ν o =10~26V sine wave;

[0037] Tracking frequency f = 1MHz;

[0038] Stepped wave voltage generator circuit switching frequency f s =500kHz;

[0039] Step wave level number N = 4;

[0040] Peak load power P peak =52W.

[0041] As described above, the method of the present invention has the following advantages: The proposed input source multiplexing relay-charging parallel envelope tracking power supply improves upon conventional envelope tracking power supplies. It integrates the level providing unit and level gating unit of the stepped fitting structure envelope tracking power supply through a relay-charging switched-capacitor converter. Simultaneously, the pulse edge distribution unit can redistribute the switching sequence of the switching transistors according to the modulation voltage signal generated by the feedforward control circuit, achieving a frequency reduction of 1 / k relative to the reference signal frequency, thus improving the feasibility and reliability of the circuit under high-frequency signal tracking. The input source multiplexing of the stepped wave voltage generation circuit reduces both the voltage across the right transistor of the Class AB linear amplifier and the input current of the input source, improving circuit efficiency. The proposed input source multiplexing relay-charging parallel envelope tracking power supply helps to further reduce the switching frequency while ensuring tracking bandwidth, simplifying the circuit structure and further improving the overall efficiency of the circuit.

[0042] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The method can be implemented using standard programming techniques—including a non-transitory computer-readable storage medium configured with a computer program, wherein such a storage medium causes the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).

[0043] Furthermore, the procedures described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by the context. The procedures described herein (or variations and / or combinations thereof) may be executed under the control of one or more computer systems configured with executable instructions, and may be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. The computer program comprises a plurality of instructions executable by one or more processors.

[0044] Furthermore, the method can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques described herein, the invention also includes the computer itself. A computer program can be applied to input data to perform the functions described herein, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices such as a display. In a preferred embodiment of the invention, the converted data represents physical and tangible objects, including specific visual depictions of physical and tangible objects generated on a display.

[0045] As used herein, the terms “component,” “module,” “system,” etc., are intended to refer to a computer-related entity, which may be hardware, firmware, a combination of hardware and software, software, or running software. For example, a component may be, but is not limited to, a process running on a processor, a processor, an object, an executable file, a running thread, a program, and / or a computer. As an example, an application running on a computing device and the computing device itself can both be components. One or more components may reside in a running process and / or thread, and components may be located in a single computer and / or distributed among two or more computers. Furthermore, these components are capable of execution from various computer-readable media having various data structures thereon. These components may communicate locally and / or remotely via signals, such as based on one or more data packets (e.g., data from a component that interacts with a local system, another component in a distributed system, and / or signals that interact with other systems via a network such as the Internet).

[0046] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A relay-charging parallel envelope tracking power supply with input source multiplexing, characterized in that, include: Stepped wave voltage generation circuit, Class AB linear amplifier, feedforward control circuit, pulse edge distribution unit; The stepped wave voltage generating circuit comprises an input source V in1 , a capacitor, and a switch tube, and is a single power input relay charging type switched capacitor multi-level converter. The AB class linear amplifier comprises an input source V in2 a pair of complementary power transistors, a power supply providing a power transistor bias voltage, a sampling circuit, a voltage regulator The stepped-wave voltage generating circuit is connected in parallel with the Class AB linear amplifier. Simultaneously, the collector of the right transistor T2 of the Class AB linear amplifier is connected to the input source V of the stepped-wave voltage generating circuit. in1 The positive terminal is connected through a unidirectional diode; The feedforward control circuit performs feedforward control on the current sampling result after the load voltage sampling signal is processed by proportional-differential operation, converts the current sampling signal into a modulated wave voltage, compares the modulated wave voltage with the threshold level to generate a pulse signal, and outputs it to the pulse edge distribution unit. The pulse edge distribution unit distributes the pulse signal generated by the feedforward control circuit to each switching transistor according to the principle that the branch triggered by the rising edge is also triggered by the falling edge, thus forming a stepped wave voltage.

2. The input source multiplexing relay charging parallel envelope tracking power supply as described in claim 1, further characterized in that: It also includes, The stepped-wave voltage generation circuit is a single-supply input relay-charged switched-capacitor multilevel converter. This converter consists of one DC voltage input source V. in1 m capacitors C1, C2, ..., C m-1 C BS It consists of m main switching transistors, m auxiliary switching transistors, and m additional switching transistors, wherein when the main switching transistor Q of a certain path... i When (i = 1, 2, ..., m) is turned on, the corresponding auxiliary switch Q in (i = 1, 2, ..., m) and additional switch Q is (s=1,2,...,m) is closed, and the capacitance C of the corresponding branch is... i Discharge causes the output voltage of the stepped-wave voltage generator circuit to increase accordingly; when the main switch Q of a certain path... i When (i = 1, 2, ..., m) is turned off, the corresponding auxiliary switch Q in (i = 1, 2, ..., m) and additional switch Q is (s=1,2,...,m) is turned on, and the capacitance C of the corresponding branch is... i As the circuit charges, the output voltage of the stepped wave voltage generator decreases accordingly.

3. The input source multiplexing relay charging parallel envelope tracking power supply as described in claim 1, further characterized in that: It also includes, The collector of the right transistor T2 of the class AB linear amplifier is connected to the input source V of the stepped-wave voltage generator circuit. in1 The positive terminal is connected via a unidirectional diode. The anode of the diode is connected to the collector of the right transistor, and the cathode is connected to the positive terminal of the input source. The input source of the stepped-wave voltage generator circuit supplies power to both the relay-charge switched-capacitor converter and the right transistor T2 of the Class AB linear amplifier, reducing the voltage drop across T2. The current flowing through T2 returns to the positive terminal of the input source through the unidirectional diode, charging the capacitor in the stepped-wave voltage generator circuit along with the input source, thus reducing the input source voltage V. in1 The output current.

4. The stepped-wave voltage generating circuit as described in claim 2, further characterized in that: It also includes, The modulated wave voltage generated by the feedforward control circuit, after being compared with the corresponding threshold level, generates rising and falling edge pulse signals. These signals are then distributed to the m main switching transistors via a pulse edge distribution unit, reducing the switching frequency of the transistors to 1 / k times the tracking signal frequency, forming a stepped wave voltage. This voltage is then transmitted through inductor L. r After filtering, the stepped-wave voltage generator circuit fits the output current as the load R in the form of a current source. Ld The power supply circuit generates a stepped-wave voltage that produces a voltage level that is higher than the maximum load voltage and a voltage level that is lower than the minimum load voltage.

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