Power supply modulation method and power supply modulator
First Claim
1. A modulation method for an envelope tracking power supply, wherein an output of a multi-level switch regulator in the envelope tracking power supply is connected in parallel with an output of a linear regulator through an inductor, the method comprising:
- generating a first control signal according to a current obtained from an input first reference level signal, wherein the first reference level signal controls a change trend of an output current of the multi-level switch regulator;
comparing an amplitude of a second reference level signal obtained from the first reference level signal with preset amplitudes of at least three grades of levels, outputting a second control signal according to a result of the comparison and the first control signal, wherein at least one of the preset amplitudes of at least three grades of levels is less than the amplitude of the second reference level signal and at least one of the preset amplitudes of at least three grades of levels is greater than the amplitude of the second reference level signal;
outputting, by the multi-level switch regulator, a level signal with a corresponding amplitude according to the second control signal, and applying the level signal with the corresponding amplitude on the inductor to output an inductive current; and
linearly adjusting, by the linear regulator, the first reference level signal to obtain a voltage output from the envelope tracking power supply to a load.
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Abstract
A modulation method and modulator for an envelope tracking power supply. An output of a multi-level switching regulator (202) in the envelope tracking power supply modulator is in parallel connection with an output of a linear regulator (201) via an inductor (203) and supplies power to a load. The modulation method for the envelope tracking power supply includes: generating a first control signal (209) according to the current (211) obtained from inputting a first reference level signal (206); comparing the amplitude of a second reference level signal (2061) obtained according to the first reference level signal (206) with preset amplitudes of at least three levels, and outputting a second control signal (210) according to the comparison result and the first control signal (209); the multi-level switching regulator (202) outputting a level signal of corresponding amplitude according to the second control signal (210), and loading the amplitude of the level on the inductor (203) to output an inductive current (208′); and linearly regulating the first reference level signal (206) via a linear regulator (201) to obtain a voltage output (207) to the load. The present disclosure resolves the problem of fixed rate of change of current output by the switching regulator of the envelope tracking power supply regulator and cannot adjust to different load current change rates, thus the inductive current outputted by the multi-level switching regulator can better track the load current change.
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Citations
18 Claims
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1. A modulation method for an envelope tracking power supply, wherein an output of a multi-level switch regulator in the envelope tracking power supply is connected in parallel with an output of a linear regulator through an inductor, the method comprising:
- generating a first control signal according to a current obtained from an input first reference level signal, wherein the first reference level signal controls a change trend of an output current of the multi-level switch regulator;
comparing an amplitude of a second reference level signal obtained from the first reference level signal with preset amplitudes of at least three grades of levels, outputting a second control signal according to a result of the comparison and the first control signal, wherein at least one of the preset amplitudes of at least three grades of levels is less than the amplitude of the second reference level signal and at least one of the preset amplitudes of at least three grades of levels is greater than the amplitude of the second reference level signal;
outputting, by the multi-level switch regulator, a level signal with a corresponding amplitude according to the second control signal, and applying the level signal with the corresponding amplitude on the inductor to output an inductive current; and
linearly adjusting, by the linear regulator, the first reference level signal to obtain a voltage output from the envelope tracking power supply to a load. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- generating a first control signal according to a current obtained from an input first reference level signal, wherein the first reference level signal controls a change trend of an output current of the multi-level switch regulator;
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10. A modulator for an envelope tracking power supply, comprising a linear regulator, a multi-level switch regulator, an inductor, a current controller and a level selection controller, wherein, an output of the multi-level switch regulator is connected in parallel with an output of the linear regulator through the inductor;
- the current controller, the level selection controller and the multi-level switch regulator are connected in series;
the current controller is configured to generate a first control signal according to a current obtained from an input first reference level signal, wherein the first reference level signal controls a change trend of an output current of the multi-level switch regulator, the current controller is connected with the level selection controller through a port for outputting the first control signal, and a second reference level signal obtained from the first reference level signal is input to the level selection controller;
the level selection controller is configured to compare an amplitude of the second reference level signal obtained from the first reference level signal with preset amplitudes of at least three grades of levels to output a second control signal, wherein at least one of the preset amplitudes of at least three grades of levels is less than the amplitude of the second reference level signal, and at least one of the preset amplitudes of at least three grades of levels is greater than the amplitude of the second reference level signal, the level selection controller is connected with the multi-level switch regulator through a port for outputting the second control signal;
the multi-level switch regulator is configured to output a level signal with a corresponding amplitude according to the second control signal, and to apply a level signal with the corresponding amplitude on the inductor to output an inductive current; and
the linear regulator is configured to linearly adjust the first reference level signal to obtain a voltage output from the envelope tracking power supply to a load. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
- the current controller, the level selection controller and the multi-level switch regulator are connected in series;
Specification