CN115395783A - Envelope tracking power supply with dynamic power supply function - Google Patents

Envelope tracking power supply with dynamic power supply function Download PDF

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Publication number
CN115395783A
CN115395783A CN202211083387.2A CN202211083387A CN115395783A CN 115395783 A CN115395783 A CN 115395783A CN 202211083387 A CN202211083387 A CN 202211083387A CN 115395783 A CN115395783 A CN 115395783A
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linear
power supply
current
tube
link circuit
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沈磊
曾庆威
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Hangzhou Dianzi University
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Hangzhou Dianzi University
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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
    • 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
    • H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
    • 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
    • H02M1/0048—Circuits or arrangements for reducing losses
    • 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
    • H02M3/157—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 with digital control
    • 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
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The invention belongs to the technical field of power electronics, and discloses an envelope tracking power supply with a dynamic power supply function, which comprises a switch link circuit, a linear link circuit, a digital controller, an analog controller, a load and a tracking signal; the control signal of the switch link circuit is given by the output end of the digital controller, the control signal of the linear link circuit is given by the output end of the analog controller, the reference signal of the analog controller is directly given by the output end of the tracking signal, the reference signal of the digital controller is obtained by synchronously sampling the tracking signal, and the output current of the switch link circuit is controlled by the current control loop circuit to realize the rapid tracking of the envelope curve. The invention improves the delay problem of the switch link circuit and the linear link circuit in the tracking amplification process, and improves the tracking precision and efficiency of the whole power supply; the integration is facilitated; when power is supplied to the rear-stage loads such as the linear power amplifier, the energy loss in the power supply process is reduced, and the efficiency of the linear power amplifier is improved.

Description

Envelope tracking power supply with dynamic power supply function
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to an envelope tracking power supply with a dynamic power supply function.
Background
In the old generation mobile communication technology, the amplitude of the radio frequency input signal is not changed, that is, the radio frequency signal has a constant envelope curve as the power supply reference of the radio frequency power amplifier, and a static power supply mode of constant voltage output can be directly adopted. However, with the coming of the fifth generation communication technology, the frequency and amplitude of the rf input signal are both in dynamic changes, and the peak-to-average ratio of the signal also tends to increase. The complex radio frequency input signal no longer has a constant envelope line, and the variable envelope line characteristic puts higher requirements on a power supply system of a radio frequency power amplifier. Meanwhile, higher requirements are also put forward on the bandwidth and the spectrum utilization rate of the signal. For a variable-envelope radio frequency input signal, a large power amplifier loss is caused by a voltage difference formed between a conventional static power supply voltage and a variable-envelope voltage, and therefore, a dynamic power supply voltage needs to be provided by an envelope tracking power supply. The envelope tracking power supply can select different circuit topologies according to power and index requirements, and in order to simultaneously consider the high efficiency characteristic of the switching power supply and the high precision characteristic of the linear power supply, the envelope tracking power supply and the switching power supply are generally combined in a series or parallel connection mode, and the advantages of the envelope tracking power supply and the linear power supply are also considered. In addition, in the multi-path circuit for simultaneously performing tracking and amplifying actions, the problem of delay of each link in the tracking and amplifying process needs to be strictly controlled, otherwise, the system efficiency is greatly reduced, and the delay problem puts higher requirements on the design of an envelope tracking power supply.
Disclosure of Invention
The invention aims to provide an envelope tracking power supply with a dynamic power supply function, and aims to solve the technical problems that a large power amplifier loss is caused by a voltage difference formed between a static power supply voltage and a variable envelope line voltage, and a switching link and a linear link in the envelope tracking power supply are delayed in the tracking amplification process.
In order to solve the technical problem, the specific technical scheme of the envelope tracking power supply with the dynamic power supply function of the invention is as follows:
an envelope tracking power supply with a dynamic power supply function based on digital synchronous sampling comprises a switch link circuit, a linear link circuit, a digital controller, an analog controller, a load, a tracking signal and a direct-current power supply DC; the output ends of the switch link circuit and the linear link circuit are simultaneously connected with a rear-stage load, and the switch link circuit and the linear link circuit are in a parallel connection structure; the switch link circuit input is connected to DC power supply DC, and the output is connected to the load, linear link circuit input is connected to DC power supply DC, and the output is connected to the load, the control signal of switch link circuit is given by digital controller's output, linear link circuit's control signal is given by analog controller's output, analog controller's reference signal is direct to be given by the tracking signal output, digital controller's reference signal carries out synchronous sampling by digital controller's synchronous sampling port to tracking signal and obtains, the output current of switch link circuit realizes the quick tracking to the envelope under the control of current control loop.
Further, the switch link circuit includes a first switch tube S1, a second switch tube S2, a power inductor L2, a first filter capacitor C1, a second filter capacitor C2, a first filter inductor L1, a load R1, and a first dc voltage source V1; the source electrode of the first switch tube S1 and the drain electrode of the second switch tube S2 are connected with one end of the power inductor L2, the other end of the power inductor L2 is connected with the load R1, the other end of the load R1 is connected with the reference ground plane, the grids of the first switch tube S1 and the second switch tube S2 are connected with the generation circuit of the grid driving signal, one end of the first filter inductor L1 is simultaneously connected with the anodes of the first filter capacitor C1 and the first direct-current voltage source V1, the other end of the first filter inductor L1 is simultaneously connected with the drain electrodes of the second filter capacitor C2 and the first switch tube S1, and the source electrode of the second switch tube S2, the other end of the second filter capacitor C2, the other end of the first filter capacitor C1 and the cathode of the first direct-current voltage source V1 are simultaneously connected with the reference ground plane.
Further, the linear link circuit includes a first linear tube T1, a second linear tube T2, a first bias diode D1, a second bias diode D2, a constant current source I1, a third filter capacitor C3, a fourth filter capacitor C4, a third filter inductor L3, and a second direct current voltage source V2; one end of the constant current source I1 is connected to a collector of the first linear tube T1, a third filter inductor L3 and a fourth filter capacitor C4, the other end of the constant current source I1 is connected to a base of the first linear tube T1 and an anode of the first bias diode D1, the other end of the third filter inductor L3 is connected to a third filter capacitor C3 and an anode of the second dc voltage source V2, a cathode of the second dc voltage source V2, the other end of the third filter capacitor C3 and the other end of the fourth filter capacitor C4 are connected to a reference ground plane, a cathode of the first bias diode D1 is connected to an anode of the second bias diode D2, a cathode of the second bias diode D2 is connected to a base of the second linear tube T2 and a generation circuit of a linear link input signal, an emitter of the second linear tube T2 is connected to an emitter of the first linear tube T1 and the load R1, and a collector of the second linear tube T2 is connected to the reference ground plane.
Further, the constant current source I1 is composed of a triode and a resistor working in an amplification region, and is configured to provide a stable direct current, a forward voltage drop is generated when the current flows through the first biased diode D1 and the second biased diode D2, and the forward voltage drops of the first biased diode D1 and the second biased diode D2 are consistent with the turn-on voltages of the first linear transistor T1 and the second linear transistor T2.
Further, when the input signal of the linear link is zero, the first linear tube T1 and the second linear tube T2 are both in a micro-conducting state, and when the characteristics of the first linear tube T1 and the second linear tube T2 are highly consistent, the output of the linear link circuit is also zero; when the input signal of the linear link is greater than zero, the first linear tube T1 is in a state that the emitter is positively biased and the collector is reversely biased, the emitter of the second linear tube T2 is reversely biased and does not participate in power conversion at the stage, and the linear link circuit is equivalent to a common-set amplifying circuit formed by the first linear tube T1; when the input signal of the linear link circuit is less than zero, the second linear tube T2 is in a state that the emitter is positively biased and the collector is reversely biased, the emitter of the first linear tube T1 is reversely biased and does not participate in the power conversion at the stage, and the linear link circuit is equivalent to a common-set amplifying circuit formed by the second linear tube T2.
Further, when the output current of the switch link circuit is smaller than the load current, the linear link circuit is equivalent to a common-collector amplifying circuit formed by a first linear tube T1, and the output port of the linear link circuit is the emitter of the first linear tube T1; when the output current of the switch link circuit is greater than the load current, the linear link circuit provides reverse output current, the linear link circuit is equivalent to a common-set amplifying circuit formed by a second linear tube T2, and the output port of the linear link is the emitter of the second linear tube T2.
Furthermore, a control loop of the switch link circuit is realized by a digital controller, a current sampling link acquires output current of the switch link circuit through a hardware sampling circuit and transmits the output current to the digital controller as an actual value of current to be controlled at the time, meanwhile, the digital controller synchronously samples a tracking signal through a high-speed sampling port to serve as a current reference signal of a current loop to obtain an error signal of the current loop at the time, the error signal performs proportional integral calculation through a current compensation link, the calculated current modulation signal obtains a signal-level gate drive signal containing duty ratio information through a PWM (pulse width modulation) modulation link, and the gate drive signal generates a high-current-level gate drive signal through a gate drive circuit to drive a first switch tube S1 and a second switch tube S2 and control the on and off of the first switch tube S1 and the second switch tube S2.
Furthermore, the control loop of the linear link is realized by an analog controller, the voltage sampling link acquires the output voltage of the linear link through a hardware sampling circuit and transmits the output voltage to the analog controller formed by a resistor, a capacitor and an integrated operational amplifier to be used as the actual value of the controlled current at the moment, meanwhile, a tracking signal is given to a voltage compensation link as a reference signal of the voltage loop, the voltage compensation link carries out operations such as proportional integral and the like on the error of the voltage and the capacitance to obtain a voltage modulation signal, and the modulation signal is transmitted to the linear link circuit to be used as the input signal of the linear link after the amplification effect of the voltage amplification link.
The envelope tracking power supply with the dynamic power supply function has the following advantages: the envelope tracking power supply with the dynamic power supply function simultaneously gives the tracking signal to the reference input port of the linear link and the ADC sampling pin of the digital controller, so that the reference of the control loops of the two links has high synchronism, the tracking precision of the switching link is improved, the loss of the linear link is reduced, and the overall efficiency of the envelope tracking power supply is improved. In addition, the digital controller can compensate the current loop through operations such as proportional integral and the like, and then generates a grid driving signal through PWM modulation, which is beneficial to the integration of a sampling part and a control part of a switching link. In the aspect of selection of control objects, the control object of the switch link is the output current of the switch link, so that the switch link becomes an independent closed-loop control system, and the design of control parameters is facilitated.
Drawings
FIG. 1 is a schematic diagram of an envelope tracking power supply with dynamic power supply function according to the present invention;
FIG. 2 is a circuit schematic of the envelope tracking power supply of the present invention;
FIG. 3 is a control block diagram of the switching and linear elements of the present invention based on digital synchronous sampling;
fig. 4 is a diagram comparing the power supply loss of the envelope tracking power supply of the present invention and the conventional constant voltage power supply when supplying power to the linear power amplifier.
Detailed Description
For better understanding of the objects, structure and functions of the present invention, an envelope tracking power supply with dynamic power supply function will be described in further detail below with reference to the accompanying drawings.
Aiming at the problem of large loss generated when a linear power amplifier amplifies a variable envelope signal, the traditional constant-voltage power supply scheme is replaced by a dynamic power supply scheme which mainly uses an envelope tracking power supply. Aiming at the delay problem of a switching link and a linear link in an envelope tracking power supply in the tracking amplification process, a digital synchronous sampling scheme based on a digital controller is provided, the digital controller can also compensate a current loop through operations such as proportional-integral and the like, and then a grid driving signal is generated through PWM modulation, so that the integration of a sampling part and a control part of the switching link is facilitated. In addition, most of the existing control schemes sample and control the output current of a linear link, but the control method has the coupling problem of two systems in the process of designing control parameters, and the control parameters of the two links can be independently designed only by carrying out corresponding decoupling analysis.
As shown in fig. 1, an envelope tracking power supply with dynamic power supply function based on digital synchronous sampling according to the present invention includes: the circuit comprises a switch link circuit, a linear link circuit, a digital controller, an analog controller, a load, a tracking signal and a direct current power supply DC. The output ends of the switch link circuit and the linear link circuit are simultaneously connected with a rear-stage load, and the switch link circuit and the linear link circuit are in a parallel connection structure.
The input end of the switch link circuit is connected to a direct current power supply DC, the output end of the switch link circuit is connected to a load, the input end of the linear link circuit is connected to the direct current power supply DC, the output end of the linear link circuit is connected to the load, a control signal of the switch link circuit is given by the output end of the digital controller, a control signal of the linear link circuit is given by the output end of the analog controller, a reference signal of the analog controller is directly given by the output end of a tracking signal, and the tracking signal can be an envelope signal in a radio frequency signal or a high-speed time-varying signal which needs to be tracked and amplified in other application scenes. The reference signal of the digital controller is obtained by synchronously sampling the tracking signal through a synchronous sampling port of the digital controller. In order to ensure that the tracking amplification process of the switch circuit and the tracking amplification process of the linear circuit keep high synchronization in a time domain, when a tracking signal is input into a control loop of the linear link circuit, a high-speed sampling port of a digital controller is used for synchronously sampling the tracking signal, and the sampled tracking signal is used as a reference signal to be input into the control loop of the switch link circuit.
The output current of the switch link circuit is controlled by the current control loop circuit to realize the rapid tracking of the envelope line, although the switch link circuit has a certain tracking error for the tracking of the envelope line due to factors such as the bandwidth of the current loop circuit, the tracking error can be compensated by the output current of the linear link circuit, and finally the output voltage and the output current can be stably output in the shape of the envelope line. The switch link circuit and the linear link circuit are combined to form a dynamic power supply capable of providing time-varying output according to the tracking signal.
As shown in fig. 2, the switch link circuit includes a first switch tube S1, a second switch tube S2, a power inductor L2, a first filter capacitor C1, a second filter capacitor C2, a first filter inductor L1, a load R1, and a first dc voltage source V1. The source electrode of the first switch tube S1 and the drain electrode of the second switch tube S2 are connected with one end of a power inductor L2, the other end of the power inductor L2 is connected with a load R1, the other end of the load R1 is connected with a reference ground plane, the grids of the first switch tube S1 and the second switch tube S2 are connected with a grid drive signal generating circuit, one end of the first filter inductor L1 is simultaneously connected with the anodes of a first filter capacitor C1 and a first direct-current voltage source V1, the other end of the first filter inductor L1 is simultaneously connected with the second filter capacitor C2 and the drain electrode of the first switch tube S1, and the source electrode of the second switch tube S2, the other end of the second filter capacitor C2, the other end of the first filter capacitor C1 and the cathode of the first direct-current voltage source V1 are simultaneously connected with the reference ground plane.
As shown in fig. 2, the linear link circuit includes a first linear tube T1, a second linear tube T2, a first biased diode D1, a second biased diode D2, a constant current source I1, a third filter capacitor C3, a fourth filter capacitor C4, a third filter inductor L3, and a second direct current voltage source V2. One end of a constant current source I1 is connected with a collector of the first linear tube T1, a third filter inductor L3 and a fourth filter capacitor C4, the other end of the constant current source I1 is simultaneously connected with a base of the first linear tube T1 and an anode of a first bias diode D1, the other end of the third filter inductor L3 is simultaneously connected with a third filter capacitor C3 and an anode of a second direct current voltage source V2, a cathode of the second direct current voltage source V2, the other end of the third filter capacitor C3 and the other end of the fourth filter capacitor C4 are simultaneously connected with a reference ground plane, a cathode of the first bias diode D1 is connected with an anode of a second bias diode D2, a cathode of the second bias diode D2 is simultaneously connected with a base of the second linear tube T2 and a generation circuit of linear link input signals, an emitter of the second linear tube T2 is simultaneously connected with an emitter of the first linear tube T1 and a load R1, and a collector of the second linear tube T2 is connected with the reference ground plane.
The constant current source I1 consists of a triode and a resistor which work in an amplification area and is used for providing stable direct current, forward voltage drop is generated when the current flows through the first bias diode D1 and the second bias diode D2, and the forward voltage drop of the first bias diode D1 and the second bias diode D2 is consistent with the starting voltage of the first linear tube T1 and the second linear tube T2, so that the purpose of eliminating crossover distortion is achieved.
The principle of the alternate working of the linear tubes in the linear link circuit is as follows: due to the existence of the constant current source I1 and the bias diode, when the input signal of the linear link is zero, the first linear tube T1 and the second linear tube T2 are both in a micro-conduction state, and when the characteristics of the first linear tube T1 and the second linear tube T2 are highly consistent, the output of the linear link circuit is also zero; when the input signal of the linear link is greater than zero, the first linear tube T1 is in a state that the emitter is positively biased and the collector is reversely biased, while the emitter of the second linear tube T2 is reversely biased and does not participate in the power conversion at the stage, and at the moment, the linear link circuit can be equivalent to a common-set amplifying circuit formed by the first linear tube T1; when the input signal of the linear link circuit is less than zero, the second linear tube T2 is in a state that the emitter is positively biased and the collector is reversely biased, while the emitter of the first linear tube T1 is reversely biased and does not participate in the power conversion at this stage, and at this time, the linear link circuit can be equivalent to a common-set amplifying circuit formed by the second linear tube T2.
The output current of the switch link circuit generated under the control of the digital controller is sometimes greater than the load current and sometimes less than the load current, that is, the output current of the linear link circuit needs to compensate the current in two directions, the working state of the linear link circuit is analyzed from the angle of the output current of the switch link circuit, that is, when the output current of the switch link circuit is less than the load current, the linear link circuit can be equivalent to a common collecting and amplifying circuit formed by a first linear tube T1, and the output port of the linear link circuit is the emitter of the first linear tube T1; when the output current of the switch link circuit is greater than the load current, the linear link circuit needs to provide a reverse output current, the linear link circuit can be equivalent to a common-collector amplifying circuit formed by the second linear tube T2, and the output port of the linear link circuit is the emitter of the second linear tube T2.
As shown in fig. 3, a control loop of the switch link circuit is mainly implemented by a digital controller, a current sampling link acquires an output current of the switch link circuit through a hardware sampling circuit and transmits the output current to the digital controller as an actual value of a current to be controlled at the time, meanwhile, the digital controller synchronously samples a tracking signal through a high-speed sampling port as a current reference signal of the current loop, so as to obtain an error signal of the current loop at the time, the error signal is subjected to calculation such as proportional integral and the like through a current compensation link, a calculated current modulation signal is subjected to a PWM modulation link to obtain a gate drive signal of a signal level including duty ratio information, and the gate drive signal generates a gate drive signal of a large current level through a gate drive circuit, so as to drive a first switch tube S1 and a second switch tube S2 and control the on and off of the first switch tube S1 and the second switch tube S2.
The control loop of the linear link is mainly realized by an analog controller, the voltage sampling link acquires the output voltage of the linear link through a hardware sampling circuit and transmits the output voltage to the analog controller consisting of a resistor, a capacitor and an integrated operational amplifier to be used as the actual value of the controlled current at the moment, meanwhile, a tracking signal is given to a voltage compensation link as a reference signal of the voltage loop, the voltage compensation link performs operations such as proportional integral and the like on the error of the voltage and the capacitance to obtain a voltage modulation signal, and the modulation signal is transmitted to the linear link circuit to be used as the input signal of the linear link after the amplification effect of a voltage amplification link.
As shown in fig. 4, when an envelope tracking power supply with a dynamic power supply function supplies power to a linear power amplifier, compared with a conventional constant voltage power supply mode, two different power supply modes have large loss difference, and the dynamic power supply by the envelope tracking power supply can reduce the loss of the linear power amplifier and improve the system efficiency.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (8)

1. An envelope tracking power supply with a dynamic power supply function based on digital synchronous sampling is characterized by comprising a switch link circuit, a linear link circuit, a digital controller, an analog controller, a load, a tracking signal and a direct-current power supply DC; the output ends of the switch link circuit and the linear link circuit are simultaneously connected with a rear-stage load, and the switch link circuit and the linear link circuit are in a parallel connection structure; the switch link circuit input is connected to DC power supply DC, and the output is connected to the load, linear link circuit input is connected to DC power supply DC, and the output is connected to the load, the control signal of switch link circuit is given by digital controller's output, linear link circuit's control signal is given by analog controller's output, analog controller's reference signal is direct to be given by the tracking signal output, digital controller's reference signal carries out synchronous sampling by digital controller's synchronous sampling port to tracking signal and obtains, the output current of switch link circuit realizes the quick tracking to the envelope under the control of current control loop.
2. The envelope tracking power supply with the dynamic power supply function based on the digital synchronous sampling according to claim 1, wherein the switch link circuit comprises a first switch tube S1, a second switch tube S2, a power inductor L2, a first filter capacitor C1, a second filter capacitor C2, a first filter inductor L1, a load R1 and a first direct-current voltage source V1; the source electrode of the first switch tube S1 and the drain electrode of the second switch tube S2 are connected with one end of the power inductor L2, the other end of the power inductor L2 is connected with the load R1, the other end of the load R1 is connected with the reference ground plane, the grids of the first switch tube S1 and the second switch tube S2 are connected with the generation circuit of the grid driving signal, one end of the first filter inductor L1 is simultaneously connected with the anodes of the first filter capacitor C1 and the first direct-current voltage source V1, the other end of the first filter inductor L1 is simultaneously connected with the drain electrodes of the second filter capacitor C2 and the first switch tube S1, and the source electrode of the second switch tube S2, the other end of the second filter capacitor C2, the other end of the first filter capacitor C1 and the cathode of the first direct-current voltage source V1 are simultaneously connected with the reference ground plane.
3. The envelope tracking power supply with the dynamic power supply function based on the digital synchronous sampling according to claim 2, wherein the linear link circuit comprises a first linear tube T1, a second linear tube T2, a first bias diode D1, a second bias diode D2, a constant current source I1, a third filter capacitor C3, a fourth filter capacitor C4, a third filter inductor L3, and a second direct current voltage source V2; one end of the constant current source I1 is connected to a collector of the first linear tube T1, a third filter inductor L3 and a fourth filter capacitor C4, the other end of the constant current source I1 is connected to a base of the first linear tube T1 and an anode of the first bias diode D1, the other end of the third filter inductor L3 is connected to a third filter capacitor C3 and an anode of the second dc voltage source V2, a cathode of the second dc voltage source V2, the other end of the third filter capacitor C3 and the other end of the fourth filter capacitor C4 are connected to a reference ground plane, a cathode of the first bias diode D1 is connected to an anode of the second bias diode D2, a cathode of the second bias diode D2 is connected to a base of the second linear tube T2 and a generation circuit of a linear link input signal, an emitter of the second linear tube T2 is connected to an emitter of the first linear tube T1 and the load R1, and a collector of the second linear tube T2 is connected to the reference ground plane.
4. The envelope tracking power supply with dynamic power supply function based on digital synchronous sampling according to claim 3, wherein the constant current source I1 is composed of a triode and a resistor which work in an amplification region and is used for providing a stable direct current, the current generates a forward voltage drop when passing through the first biased diode D1 and the second biased diode D2, and the forward voltage drop of the first biased diode D1 and the second biased diode D2 is consistent with the turn-on voltage of the first linear tube T1 and the second linear tube T2.
5. The envelope tracking power supply with the dynamic power supply function based on the digital synchronous sampling as claimed in claim 4, wherein when the input signal of the linear link is zero, the first linear transistor T1 and the second linear transistor T2 are both in a micro-conducting state, and when the characteristics of the first linear transistor T1 and the second linear transistor T2 are highly consistent, the output of the linear link circuit is also zero; when the input signal of the linear link is greater than zero, the first linear tube T1 is in a state that the emitter is positively biased and the collector is reversely biased, the emitter of the second linear tube T2 is reversely biased and does not participate in power conversion at the stage, and the linear link circuit is equivalent to a common-set amplifying circuit formed by the first linear tube T1; when the input signal of the linear link circuit is less than zero, the second linear tube T2 is in a state that the emitter is positively biased and the collector is reversely biased, the emitter of the first linear tube T1 is reversely biased and does not participate in the power conversion at the stage, and the linear link circuit is equivalent to a common-set amplifying circuit formed by the second linear tube T2.
6. The envelope tracking power supply with dynamic power supply function based on digital synchronous sampling according to claim 4, wherein when the output current of the switch link circuit is smaller than the load current, the linear link circuit is equivalent to a common collector amplifier circuit formed by a first linear transistor T1, and the output port of the linear link circuit is the emitter of the first linear transistor T1; when the output current of the switch link circuit is greater than the load current, the linear link circuit provides reverse output current, the linear link circuit is equivalent to a common-set amplifying circuit formed by a second linear tube T2, and the output port of the linear link is the emitter of the second linear tube T2.
7. The envelope tracking power supply with the dynamic power supply function based on the digital synchronous sampling as claimed in claim 2, wherein a control loop of the switch link circuit is implemented by a digital controller, a current sampling link acquires output current of the switch link circuit through a hardware sampling circuit and transmits the output current to the digital controller as an actual value of current to be controlled at the time, meanwhile, the digital controller synchronously samples a tracking signal through a high-speed sampling port to serve as a current reference signal of a current loop at the time to obtain an error signal of the current loop at the time, the error signal performs proportional integral calculation through a current compensation link, the calculated current modulation signal obtains a gate driving signal of a signal level containing duty ratio information through a PWM modulation link, and the gate driving signal generates a gate driving signal of a large current level through a gate driving circuit to drive the first switching tube S1 and the second switching tube S2 and control the first switching tube S1 and the second switching tube S2 to be turned on and turned off.
8. The envelope tracking power supply with the dynamic power supply function based on the digital synchronous sampling as claimed in claim 1, wherein the control loop of the linear element is implemented by an analog controller, the voltage sampling element collects the output voltage of the linear element through a hardware sampling circuit and transmits the output voltage to the analog controller composed of a resistor, a capacitor and an integrated operational amplifier as the actual value of the controlled current at the time, meanwhile, the tracking signal is given to a voltage compensation element as the reference signal of the voltage loop, the voltage compensation element obtains a voltage modulation signal by performing operations such as proportional integral and the like on the error between the tracking signal and the voltage loop, and the modulation signal is transmitted to the linear element circuit as the input signal of the linear element after the amplification effect of the voltage amplification element.
CN202211083387.2A 2022-09-06 2022-09-06 Envelope tracking power supply with dynamic power supply function Pending CN115395783A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202211083387.2A CN115395783A (en) 2022-09-06 2022-09-06 Envelope tracking power supply with dynamic power supply function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202211083387.2A CN115395783A (en) 2022-09-06 2022-09-06 Envelope tracking power supply with dynamic power supply function

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CN115395783A true CN115395783A (en) 2022-11-25

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