CN112838748B - Control method and circuit of envelope tracking power supply - Google Patents
Control method and circuit of envelope tracking power supply Download PDFInfo
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- CN112838748B CN112838748B CN202110113678.0A CN202110113678A CN112838748B CN 112838748 B CN112838748 B CN 112838748B CN 202110113678 A CN202110113678 A CN 202110113678A CN 112838748 B CN112838748 B CN 112838748B
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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
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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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Abstract
The invention discloses a control method and a circuit of an envelope tracking power supply, wherein the method comprises the following steps: if a level signal is received for the first time, acquiring a timing signal according to the level signal; starting timing according to the timing signal, and sending a first driving signal to an upper driving tube of the envelope tracking power supply to enable the upper driving tube to be conducted; when the timing reaches a preset conduction time, sending a second driving signal to the upper driving tube so as to cut off the upper driving tube; the level signal is generated according to the voltage required by the load and the envelope tracking signal input to the envelope tracking power supply, so that the output ripple of the envelope tracking power supply is reduced, the system working frequency is reduced, and the power supply efficiency is improved.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a method and a circuit for controlling an envelope tracking power supply.
Background
The output ripples refer to alternating current components contained in the output direct current voltage of the power supply, and the ripples easily generate undesirable harmonics in equipment, and the harmonics can generate more harm to reduce the efficiency of the power supply; the strong ripple waves can cause the generation of surge voltage or current, which leads to the burning of electric equipment; even the logic relation of the digital circuit is interfered, the normal work of the digital circuit is influenced, noise interference is brought, and the image equipment and the sound equipment can not work normally. Therefore, the new generation wireless communication puts more attention on the output ripple while putting higher demands on the efficiency, linearity and stability of the power supply of the signal output device and the signal receiving device.
The traditional envelope tracking power supply adopts a structure of a linear amplifier, hysteresis control and a switching power supply (hysteresis control), when the direct-current voltage cannot meet the requirement, a power tube on the power supply is conducted through a hysteresis control module, the inductive current is increased, and the direct-current voltage is increased. Although the ripple is small at this time, the operating frequency of the system is high and the efficiency is low in the control mode.
Therefore, how to reduce the output ripple of the envelope tracking power supply and reduce the operating frequency of the system, thereby improving the power efficiency, is a technical problem to be solved at present.
Disclosure of Invention
The invention provides a control method of an envelope tracking power supply, which is used for solving the technical problem that the output ripple of the envelope tracking power supply cannot be reduced and the working frequency of a system cannot be reduced in the prior art. The method comprises the following steps:
if a level signal is received for the first time, acquiring a timing signal according to the level signal;
starting timing according to the timing signal, and sending a first driving signal to an upper driving tube of the envelope tracking power supply to enable the upper driving tube to be conducted;
when the timing reaches a preset conduction time, sending a second driving signal to the upper driving tube so as to cut off the upper driving tube;
wherein the level signal is generated according to a voltage required by a load and an envelope tracking signal input to the envelope tracking power supply.
In some embodiments of the present application, the method further comprises:
counting high level signals in the level signals within the preset conduction time length, and determining the period time length according to the time length sum of the high level signals;
generating a periodic signal when the period duration is reached.
In some embodiments of the present application, the timing signal is obtained according to the level signal and the periodic signal if the level signal is not received for the first time.
In some embodiments of the present application, after starting timing according to the timing signal, the method further comprises:
outputting an upper tube opening signal, and generating a conduction trigger signal according to the upper tube opening signal;
acquiring the first driving signal according to the conduction trigger signal;
outputting an upper tube cut-off signal when the timing reaches the preset on-time, and generating a trigger clearing signal according to the upper tube cut-off signal;
and acquiring the second driving signal according to the trigger clearing signal.
In some embodiments of the present application, the level signal is generated when the voltage output by the envelope tracking signal is greater than the voltage required by the load.
Correspondingly, the invention also provides a control circuit of the envelope tracking power supply, which comprises:
the time compensation module is used for converting the received high-frequency level signal into a low-frequency driving signal with a constant duty ratio and controlling the upper driving tube of the envelope tracking power supply to be switched on or switched off according to the driving signal;
the time compensation module comprises a timing unit, a trigger unit and a driving unit, wherein,
the timing unit is used for generating a timing signal according to the received level signal, outputting an upper tube opening signal to the driving unit and outputting a timing ending signal to the triggering unit;
the trigger unit is used for outputting an upper tube cut-off signal to the drive unit according to the timing end signal;
the driving unit is used for outputting a first driving signal to the upper driving tube according to the upper tube opening signal so as to enable the upper driving tube to be conducted; and the upper tube cut-off circuit is also used for outputting a second driving signal to the upper driving tube according to the upper tube cut-off signal so as to cut off the upper driving tube.
In some embodiments of the present application, the timing unit comprises:
and the Ton timing module is used for receiving the level signal or receiving the level signal and the periodic signal sent by the trigger module, outputting an upper tube opening signal to the driving unit and the trigger unit, and outputting a timing ending signal to the trigger unit.
In some embodiments of the present application, the trigger unit includes:
a Toff signal module, configured to generate the upper tube cut-off signal when receiving the timing end signal, and output the upper tube cut-off signal to the driving unit;
the Tdis signal module is used for outputting a periodic signal to the Ton timing module when the upper tube opening signal is received;
the period duration of the periodic signal is counted based on the sum of the durations of the high level signals in the level signals.
In some embodiments of the present application, the driving unit includes:
the RS trigger is used for generating a conduction trigger signal when receiving the upper tube opening signal and outputting the first driving signal to the upper driving tube according to the conduction trigger signal; and the circuit is also used for generating a trigger clearing signal when receiving the upper tube cut-off signal and outputting the second driving signal to the upper driving tube according to the trigger clearing signal.
In some embodiments of the present application, the circuit further comprises a linear module, a hysteresis module, a driver module, and an inductor, wherein,
the hysteresis module is used for outputting the level signal to the time compensation module;
the driving module is used for controlling the conduction duration of the upper driving tube or the lower driving tube according to the first driving signal and the second driving signal and outputting the corrected direct-current voltage to a load;
the first input end of the hysteresis module is connected with the output end of the linear module, the second input end of the hysteresis module is connected with the first end of the inductor, the output end of the hysteresis module is connected with the input end of the time compensation module, the output end of the time compensation module is connected with the driving module, and the driving module is further connected with the second end of the inductor.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a control method and a circuit of an envelope tracking power supply, wherein the method comprises the following steps: if a level signal is received for the first time, acquiring a timing signal according to the level signal; starting timing according to the timing signal, and sending a first driving signal to an upper driving tube of the envelope tracking power supply to enable the upper driving tube to be conducted; when the timing reaches a preset conduction time, sending a second driving signal to the upper driving tube so as to cut off the upper driving tube; the level signal is generated according to the voltage required by the load and the envelope tracking signal input into the envelope tracking power supply, so that the output ripple of the envelope tracking power supply is reduced, the system working frequency is reduced, the power supply efficiency is improved, the timing signal is obtained according to the level signal and the periodic signal when the level signal is not received for the first time, the timing signal can be obtained more accurately, and the power supply reliability is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic diagram illustrating a control circuit of an envelope tracking power supply according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a time compensation module according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a control method of an envelope tracking power supply according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the existing envelope tracking power supply circuit, a voltage signal is generated to an inductor through a hysteresis circuit to generate current, and according to the characteristics of a switch circuit, when the signal frequency is high, the current ripple wave generated by the inductor is small, but the system efficiency is low at the moment; if the signal frequency is small, the current ripple generated by the inductor is large, so the size of the current ripple is contradictory to the system efficiency.
An embodiment of the present application provides a method for controlling an envelope tracking power supply, as shown in fig. 3, including the following steps:
step S101, if a level signal is received for the first time, a timing signal is obtained according to the level signal.
In this embodiment, the level signal is generated according to the voltage required by the load and the envelope tracking signal input to the envelope tracking power supply, and when the level signal is received for the first time, the timing signal can be obtained according to the level signal, and the corresponding timing function is started.
In order to determine a reliable level signal, in a preferred embodiment of the present application, the level signal is generated when the voltage output by the envelope tracking signal is greater than the voltage required by the load.
In this embodiment, a voltage is output according to the received envelope tracking signal, the voltage is compared with a voltage required by a load, and the level signal is generated if the voltage output by the envelope tracking signal is greater than the voltage required by the load, where the load is a load of the envelope tracking power supply.
And step S102, starting timing according to the timing signal, and sending a first driving signal to an upper driving tube of the envelope tracking power supply to enable the upper driving tube to be conducted.
In this embodiment, the envelope tracking power supply includes an upper driving tube, starts timing after acquiring the timing signal, and transmits a first driving signal to the upper driving tube to turn on the upper driving tube.
And step S103, when the timing reaches a preset on-time, sending a second driving signal to the upper driving pipe so as to cut off the upper driving pipe.
In this embodiment, when the timing reaches the preset on-time, the upper driving tube needs to be turned off, and the second driving signal is sent to the upper driving tube, so that the upper driving tube is turned off.
The upper driving tube is controlled to be conducted within the preset conducting time period through the first driving signal and the second driving signal in the step S102 and the step S103, the preset conducting time period can be flexibly set according to actual needs, the frequency of the switch is changed by controlling the conducting time period of the power tube under the condition that the average duty ratio of the level signal is not changed, the output ripple of the envelope tracking power supply is reduced through a time compensation mode, the system working frequency is reduced, and the efficiency of the envelope tracking power supply is improved.
In order to reliably obtain the first driving signal and the second driving signal, in some embodiments of the present application, after starting timing according to the timing signal, the method further comprises:
outputting an upper tube opening signal, and generating a conduction trigger signal according to the upper tube opening signal;
acquiring the first driving signal according to the conduction trigger signal;
outputting an upper tube cut-off signal when the timing reaches the preset on-time, and generating a trigger clearing signal according to the upper tube cut-off signal;
and acquiring the second driving signal according to the trigger clearing signal.
In the embodiment, when the timing starts, an upper tube opening signal is output, a conduction trigger signal is generated according to the upper tube opening signal, and then a first driving signal is obtained according to the conduction trigger signal; when the timing reaches the preset on-time, an upper tube cut-off signal is output, a trigger clearing signal is output according to the upper tube cut-off signal, and then a second driving signal is obtained according to the trigger clearing signal.
The above embodiment is only one specific implementation proposed in the present application, and those skilled in the art may select other ways to obtain the first driving signal and the second driving signal, which does not affect the protection scope of the present application.
For reliable generation of the timing signal, in some embodiments of the present application, the method further comprises:
counting high level signals in the level signals within the preset conduction time length, and determining the period time length according to the time length sum of the high level signals;
generating a periodic signal when the period duration is reached.
In this embodiment, in order to obtain an accurate timing signal, when a level signal is not received for the first time, the timing signal is obtained through a periodic signal and the level signal. The level signals comprise low level signals and high level signals, after timing is started based on the timing signals, the sum of the durations of the high level signals is determined by counting the high level signals in the preset conduction duration, the sum of the durations is used as the period duration of the level signals, and the period signals are generated when one period duration is over.
In order to improve the power efficiency, in some embodiments of the present application, the timing signal is obtained according to the level signal and the periodic signal, if the level signal is not received for the first time.
In this embodiment, if the level signal is not received for the first time and the periodic signal is received, it is described that the previous period is ended, and the timing signal is obtained according to the level signal and the periodic signal. Starting timing after acquiring a timing signal, and sending a first driving signal to the upper driving tube to enable the upper driving tube to be conducted; and when the timing reaches the preset conduction time, sending a second driving signal to the upper driving tube so as to cut off the upper driving tube. Through the cycle of the period, the direct-current voltage of the envelope tracking power supply is continuously increased, and the load requirement is further met.
If the level signal is not received for the first time and the periodic signal is not received, it is indicated that the last period is not finished, and the timing signal is not acquired.
By applying the technical scheme, if a level signal is received for the first time, a timing signal is obtained according to the level signal; starting timing according to the timing signal, and sending a first driving signal to an upper driving tube of the envelope tracking power supply to enable the upper driving tube to be conducted; when the timing reaches a preset conduction time, sending a second driving signal to the upper driving tube so as to cut off the upper driving tube; the level signal is generated according to the voltage required by the load and the envelope tracking signal input into the envelope tracking power supply, so that the output ripple of the envelope tracking power supply is reduced, the system working frequency is reduced, the power supply efficiency is improved, the timing signal is obtained according to the level signal and the periodic signal when the level signal is not received for the first time, the timing signal can be obtained more accurately, and the power supply reliability is improved.
In order to further illustrate the technical idea of the present invention, the technical solution of the present invention will now be described with reference to specific application scenarios.
As shown in fig. 1 and fig. 2, after the level signal is received for the first time, a timing signal is generated, and the timing function is started and continues to preset the on-time. Within the preset conduction time, the driving tube M1 on the envelope tracking power supply acquires a first driving signal and conducts, a period time counting function is started, and a period signal Tdis is output after one period time is finished.
It should be noted that, the high level signal in the level signal fb _ comp is counted in the preset on period, and the period duration is determined according to the sum of the durations of the high level signal.
When the timing reaches the preset on duration, a second driving signal is output to the upper driving tube M1, and the upper driving tube M1 is turned off.
In the above embodiment, the problem of contradiction between the magnitude of the current ripple and the system efficiency is solved by means of time compensation, and specifically, the frequency of the switch is changed by controlling the on-time of the power tube without changing the average duty ratio of the signal, so that the problem of large low-frequency output ripple is avoided.
When the level signal fb _ comp is not received for the first time and the periodic signal Tdis is received, a timing signal is output and a timing function is started. If the periodic signal Tdis is not received, it indicates that the previous period is not finished, and no timing signal is generated.
After the timing signal is generated, within a preset conduction time, a first driving signal is output to the upper driving tube M1 to be conducted. Specifically, after the timing signal is generated, the upper tube opening signal Pon is output, and according to the received upper tube opening signal Pon, the conduction trigger signal is output to enable the upper driving tube M1 to obtain the conduction of the first driving signal, so that the inductive current of the envelope tracking power supply is increased, and the direct-current voltage is further improved.
When the timing reaches the preset on duration, a second driving signal is output to the upper driving tube M1 to stop the upper driving tube M1. Specifically, when the timing reaches the preset on-time, a timing end signal is output, and a trigger clear signal is output to enable the upper driving tube M1 to obtain a second driving signal to be cut off.
Through the cycle of the period, the direct-current voltage of the envelope tracking power supply is continuously increased, and the load requirement is further met. When the same frequency signal is processed, the conduction frequency of the upper driving tube M1 can be reduced, thereby further reducing the ripple of the output power supply output. This is because, after the level signal fb _ comp and the periodic signal Tdis are obtained, the upper driving tube M1 is controlled to be turned on in the preset on duration without changing the duty ratio of the signal, and the on frequency of the upper driving tube M1 is changed by changing the waveform of the signal, so as to further achieve the purpose of reducing the output ripple.
As shown in fig. 1, when the voltage V1 of the envelope tracking signal input to the envelope tracking power supply is greater than the load required voltage V2, the level signal fb _ comp is output.
As shown in fig. 1 and fig. 2, an embodiment of the present application further provides a control circuit of an envelope tracking power supply, including:
the time compensation module is used for converting the received high-frequency level signal into a low-frequency driving signal with a constant duty ratio and controlling the upper driving tube of the envelope tracking power supply to be switched on or switched off according to the driving signal;
the time compensation module comprises a timing unit, a trigger unit and a driving unit, wherein,
the timing unit is used for generating a timing signal according to the received level signal, outputting an upper tube opening signal to the driving unit and outputting a timing ending signal to the triggering unit;
the trigger unit is used for outputting an upper tube cut-off signal to the drive unit according to the timing end signal;
the driving unit is used for outputting a first driving signal to the upper driving tube according to the upper tube opening signal so as to enable the upper driving tube to be conducted; and the upper tube cut-off circuit is also used for outputting a second driving signal to the upper driving tube according to the upper tube cut-off signal so as to cut off the upper driving tube.
In this embodiment, the timing unit generates the upper tube opening signal Pon to the driving unit according to the received level signal fb _ comp at a preset turn-on duration, so that the upper driving tube M1 obtains the first driving signal to turn on; when the timing reaches the preset on-duration, the timing unit will generate a timing end signal to the trigger unit, so that the trigger unit outputs an upper tube cut-off signal to the driving unit, and the driving unit generates a second driving signal to cut off the driving tube M1.
After receiving the level signal fb _ comp, the upper tube opening signal Pon is also sent to the trigger unit, so that the trigger unit starts a period timing function to start period duration statistics.
For reliable timing, in some embodiments of the present application, as shown in fig. 2, the timing unit includes:
and the Ton timing module is used for receiving the level signal or receiving the level signal and the periodic signal sent by the trigger module, outputting an upper tube opening signal to the driving unit and the trigger unit, and outputting a timing ending signal to the trigger unit.
When the Ton timing module receives a high-frequency level signal for the first time, a timing signal is generated to enable a timing system inside the Ton timing signal to start and count timing, within a preset conduction duration, the Ton timing module outputs an upper tube opening signal Pon to the driving unit to enable the upper driving tube M1 to obtain a first driving signal to be conducted, and the Ton timing module also outputs the upper tube opening signal Pon to the triggering unit to enable the triggering unit to generate a periodic signal Tdis; when the timing reaches the preset conduction time length, the Ton timing module outputs a timing end signal to the trigger unit.
When the Ton timing module does not receive a high-frequency level signal for the first time and receives a periodic signal Tdis sent by the trigger module, the Ton timing module generates a timing signal to enable a timing system inside the Ton timing signal to start and count timing, and within a preset conduction time length, the Ton timing module outputs an upper tube opening signal Pon to the driving unit to enable the upper driving tube M1 to obtain a first driving signal to be conducted; when the timing reaches the preset conduction time length, the Ton timing module outputs a timing end signal to the trigger unit. Through the statistics of the preset conduction time length and the period time length, the conduction frequency of the upper driving tube M1 can be reduced under the condition that the duty ratio is not changed.
In order to improve the reliability of the circuit, in some embodiments of the present application, as shown in fig. 2, the trigger unit includes:
a Toff signal module, configured to generate the upper tube cut-off signal when receiving the timing end signal, and output the upper tube cut-off signal to the driving unit;
the Tdis signal module is used for outputting a periodic signal to the Ton timing module when the upper tube opening signal is received;
the period duration of the periodic signal is counted based on the sum of the durations of the high level signals in the level signals.
In this embodiment, when the Ton timing module starts and enters a timing state, the top tube open signal Pon is output to the driving unit and the Tdis signal module, so that the Tdis signal module performs duty ratio statistical calculation within a preset on-time, and outputs a periodic signal Tdis to the Ton timing module when a period time ends, and the flag enters a next period time, where the period time is counted based on a sum of time lengths of high level signals in the level signals.
When receiving the timing end signal, the Toff signal module outputs an upper tube cut-off signal to the driving unit.
In order to improve the reliability of the circuit, in some embodiments of the present application, as shown in fig. 2, the driving unit includes:
the RS trigger is used for generating a conduction trigger signal when receiving the upper tube opening signal and outputting the first driving signal to the upper driving tube according to the conduction trigger signal; and the circuit is also used for generating a trigger clearing signal when receiving the upper tube cut-off signal and outputting the second driving signal to the upper driving tube according to the trigger clearing signal.
In this embodiment, when the RS flip-flop receives the upper tube opening signal Pon, a conduction trigger signal is generated to make the upper driving tube M1 obtain a first driving signal conduction. When the RS trigger receives the upper tube cut-off signal output by the Toff signal module, a trigger clearing signal is generated to enable the upper driving tube M1 to obtain a second driving signal cut-off.
In order to improve the reliability of the circuit, the circuit further comprises a linear block, a hysteresis block, a driving block and an inductor L, as shown in fig. 1, wherein,
the hysteresis module is used for outputting the level signal to the time compensation module;
the driving module is used for controlling the conduction duration of the upper driving tube or the lower driving tube according to the first driving signal and the second driving signal and outputting the corrected direct-current voltage to a load;
the first input end of the hysteresis module is connected with the output end of the linear module, the second input end of the hysteresis module is connected with the first end of the inductor L, the output end of the hysteresis module is connected with the input end of the time compensation module, the output end of the time compensation module is connected with the driving module, and the driving module is further connected with the second end of the inductor L.
In this embodiment, the linear module is a linear amplifier, the envelope tracking signal passes through the linear module and then outputs a first voltage signal V1, when the first voltage signal V1 is greater than a second voltage signal V2, the second voltage signal V2 is a voltage required by a load, the hysteresis module outputs a level signal fb _ comp to the time compensation module, so that the Ton timing module obtains a timing signal to start, and continuously outputs a top tube open signal Pon to the RS flip-flop within a preset conduction duration, so that the top driving tube M1 obtains a first driving signal to conduct; when the preset on-time of the Ton timing module is over, the Ton timing module outputs a timing over signal to the Toff signal module, and the Toff signal module outputs an upper tube cut-off signal to the RS flip-flop, so that the upper driving tube M1 obtains a second driving signal to be cut off.
Comparing the first voltage signal V1 with the second voltage signal V2, outputting a level signal fb _ comp, and outputting a first driving signal of a turn-on driving signal by performing time compensation processing on the level signal fb _ comp, that is, performing frequency conversion processing on a high-frequency level signal, specifically, when Ton obtains the level signal fb _ comp and a period signal Tdis, which indicates that a next period starts, the Ton timing module outputs a tube opening signal Pon within a preset turn-on duration, so that the upper driving tube M1 obtains the turn-on driving signal first driving signal; when the preset conduction time length is over, the second driving signal which enables the upper driving tube M1 to obtain the cut-off driving signal is output, and therefore conduction of the upper driving tube M1 is controlled. After obtaining the upper tube opening signal Pon, the Tdis signal module determines the period duration of the level signal fb _ comp to achieve the purpose of not changing the duty ratio of the level signal fb _ comp, so that the on-frequency of the upper driving tube M1 is reduced and the output ripple is reduced under the condition of ensuring the stable power supply voltage.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not necessarily depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for controlling an envelope tracking power supply, the method comprising: if a level signal is received for the first time, acquiring a timing signal according to the level signal; starting timing according to the timing signal, and sending a first driving signal to an upper driving tube of the envelope tracking power supply to enable the upper driving tube to be conducted; when the timing reaches a preset conduction time, sending a second driving signal to the upper driving tube so as to cut off the upper driving tube; under the condition of not changing the average duty ratio of the level signal, the frequency of the switch is changed by controlling the conduction duration of the power tube; wherein the level signal is generated according to a voltage required by a load and an envelope tracking signal input to the envelope tracking power supply.
2. The method of claim 1, wherein the method further comprises: counting high level signals in the level signals within the preset conduction time length, and determining the period time length according to the time length sum of the high level signals; generating a periodic signal when the period duration is reached.
3. The method of claim 2, wherein the timing signal is derived based on the level signal and the periodic signal if the level signal is not first received.
4. The method of claim 1, wherein after starting timing according to the timing signal, the method further comprises: outputting an upper tube opening signal, and generating a conduction trigger signal according to the upper tube opening signal; acquiring the first driving signal according to the conduction trigger signal; outputting an upper tube cut-off signal when the timing reaches the preset on-time, and generating a trigger clearing signal according to the upper tube cut-off signal; and acquiring the second driving signal according to the trigger clearing signal.
5. The method of claim 1, wherein the level signal is generated when a voltage output by the envelope tracking signal is greater than a voltage required by the load.
6. A control circuit for an envelope tracking power supply, comprising: the time compensation module is used for converting the received high-frequency level signal into a low-frequency driving signal with a constant duty ratio and controlling the upper driving tube of the envelope tracking power supply to be switched on or switched off according to the driving signal; the time compensation module comprises a timing unit, a trigger unit and a drive unit, wherein the timing unit is used for generating a timing signal according to a received level signal, outputting an upper tube opening signal to the drive unit and outputting a timing ending signal to the trigger unit; the trigger unit is used for outputting an upper tube cut-off signal to the drive unit according to the timing end signal; the driving unit is used for outputting a first driving signal to the upper driving tube according to the upper tube opening signal so as to enable the upper driving tube to be conducted; the upper tube cut-off circuit is also used for outputting a second driving signal to the upper driving tube according to the upper tube cut-off signal so as to cut off the upper driving tube; wherein the level signal is generated according to a voltage required by a load and an envelope tracking signal input to the envelope tracking power supply.
7. The circuit of claim 6, wherein the timing unit comprises: and the Ton timing module is used for receiving the level signal or receiving the level signal and the periodic signal sent by the trigger unit, outputting an upper tube opening signal to the driving unit and the trigger unit, and outputting a timing ending signal to the trigger unit.
8. The circuit of claim 7, wherein the trigger unit comprises: a Toff signal module, configured to generate the upper tube cut-off signal when receiving the timing end signal, and output the upper tube cut-off signal to the driving unit; the Tdis signal module is used for outputting a periodic signal to the Ton timing module when the upper tube opening signal is received; the period duration of the periodic signal is counted based on the sum of the durations of the high level signals in the level signals.
9. The circuit of claim 8, wherein the driving unit comprises: the RS trigger is used for generating a conduction trigger signal when receiving the upper tube opening signal and outputting the first driving signal to the upper driving tube according to the conduction trigger signal; and the circuit is also used for generating a trigger clearing signal when receiving the upper tube cut-off signal and outputting the second driving signal to the upper driving tube according to the trigger clearing signal.
10. The circuit of claim 6, further comprising a linear module, a hysteresis module, a driving module, and an inductor, wherein the hysteresis module is configured to output the level signal to the time compensation module; the driving module is used for controlling the conduction duration of the upper driving tube or the lower driving tube according to the first driving signal and the second driving signal and outputting the corrected direct-current voltage to a load; the first input end of the hysteresis module is connected with the output end of the linear module, the second input end of the hysteresis module is connected with the first end of the inductor, the output end of the hysteresis module is connected with the input end of the time compensation module, the output end of the time compensation module is connected with the driving module, and the driving module is further connected with the second end of the inductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN109617412A (en) * | 2019-01-14 | 2019-04-12 | 泉芯电子技术(深圳)有限公司 | Booster system response speed translation circuit and its control method based on PFM control |
| CN110868052A (en) * | 2019-12-10 | 2020-03-06 | 陕西亚成微电子股份有限公司 | Envelope tracking power amplifier switch power supply control method and switch power supply |
| CN111370752A (en) * | 2020-04-08 | 2020-07-03 | 隆能科技(南通)有限公司 | Fast charging and safe low temperature lithium ion battery and method of manufacturing the same |
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| JP5119961B2 (en) * | 2008-02-08 | 2013-01-16 | 住友電気工業株式会社 | Envelope tracking power supply circuit and high-frequency amplifier including the same |
| US8975887B2 (en) * | 2012-07-08 | 2015-03-10 | R2 Semiconductor, Inc. | Suppressing oscillations in an output of a switched power converter |
| TW201442440A (en) * | 2013-04-16 | 2014-11-01 | Nvidia Corp | Circuit and method for envelope tracking and envelope-tracking transmitter for radio-frequency transmission |
| US9595869B2 (en) * | 2015-02-27 | 2017-03-14 | Qualcomm Incorporated | Multi-level switching regulator circuits and methods with finite state machine control |
| US9685864B2 (en) * | 2015-03-31 | 2017-06-20 | Qualcomm Incorporated | Switching regulator circuits and methods with reconfigurable inductance |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109617412A (en) * | 2019-01-14 | 2019-04-12 | 泉芯电子技术(深圳)有限公司 | Booster system response speed translation circuit and its control method based on PFM control |
| CN110868052A (en) * | 2019-12-10 | 2020-03-06 | 陕西亚成微电子股份有限公司 | Envelope tracking power amplifier switch power supply control method and switch power supply |
| CN111370752A (en) * | 2020-04-08 | 2020-07-03 | 隆能科技(南通)有限公司 | Fast charging and safe low temperature lithium ion battery and method of manufacturing the same |
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