CN115987102A - Multiphase buck controller - Google Patents
Multiphase buck controller Download PDFInfo
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- CN115987102A CN115987102A CN202310058279.8A CN202310058279A CN115987102A CN 115987102 A CN115987102 A CN 115987102A CN 202310058279 A CN202310058279 A CN 202310058279A CN 115987102 A CN115987102 A CN 115987102A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a multiphase buck controller, which comprises an EA unit of a loop operational amplifier and an N-level output level unit, wherein N is an integer more than or equal to 2, the output level unit comprises a current-sharing module, a four-input comparator and a power level, one input end of the current-sharing module is connected with the output of the current level, the other input end of the current-sharing module is connected with the output of the first-level output level, the first input end of the four-input comparator is connected with the output of the power level unit, the second input end of the four-input comparator is connected with the output of the current-sharing module, the third input end of the current-sharing module is connected with the output of the EA unit of the loop operational amplifier, the fourth input end of the current-sharing module is connected with a triangular wave RAMP signal, the output end of the four-input comparator is connected with the input end of the power level, and the four-input comparator is used for collecting inductive current change through a current sampling unit and carrying out four-phase current sharing through the current-sharing module.
Description
Technical Field
The invention mainly relates to the field of power management, in particular to a multiphase buck controller.
Background
With the rapid development of consumer electronics, the demand and performance requirements for Integrated voltage modulators (IVRs) in Power Management Integrated Circuits (PMICs) in electronic products are also increasing. The method also puts higher requirements on the output load capacity of the IVR, the mainstream trend is to realize the improvement of the load capacity by a multiphase buck controller mode, meanwhile, the faster the transient jump response of the IVR to the output load is, the better the transient jump response is, and the common method is to improve the switching frequency of the IVR or increase the loop bandwidth. For a scene requiring an IVR with an output load capacity of several tens of amperes to several hundreds of amperes, the number of DCDC circuits connected in parallel is required to reach 16 phases, 32 phases or more. As shown in fig. 1, a schematic block diagram of a 4-phase parallel buck conversion BUC type DCDC circuit is provided, an output voltage VEAOUT of an error amplifier EA (error amplifier EA) is connected to negative terminals of four comparators COMP (comparators), a preset triangular wave signal VSAW is respectively connected to positive terminals of the comparators COMP, so as to generate square wave voltage signals with a predetermined duty ratio, an output signal V0 is obtained through a power stage circuit composed of a Buffer BUF (Buffer), two triodes, output inductors L1, L2, L3 and L4, and an output capacitor C0, and a feedback compensation unit 10 is provided at the EA terminal or the triangular wave terminal for compensation adjustment in order to ensure output equalization of each phase.
Disclosure of Invention
In order to solve the load loss caused by a feedback compensation circuit to a multiphase buck controller, the invention provides the multiphase buck controller, which comprises an EA (amplifier-loop) unit and an N-stage output stage unit, wherein N is an integer more than or equal to 2, the 1 st-stage output stage unit comprises a four-input comparator and a power stage, the first input end of the four-input comparator is connected with the output end of the power stage unit, the second input end of the four-input comparator is connected with a reference signal, the third input end of the four-input comparator is connected with the output end of the EA unit, the fourth input end of the four-input comparator is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage; the Nth-stage output stage unit comprises a current-sharing module, a four-input comparator and a power stage, one input end of the current-sharing module is connected with the output of the current-sharing module, the other input end of the current-sharing module is connected with the output of the first-stage output stage, the first input end of the four-input comparator is connected with the output of the current-sharing power stage unit, the second input end of the four-input comparator is connected with the output of the reference voltage signal current-sharing module, the third input end of the current-sharing module is connected with the output of the loop operational amplifier EA unit, the fourth input end of the current-sharing module is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage.
According to the invention, the four-input comparator is used for acquiring the current change of the inductor through the current sampling unit and carrying out four-phase current equalization through the current equalization module, the current equalization result is fed back to each phase of control loop, and the PWM of each phase is adjusted to balance the distribution of each phase of current, so that power supply output is effectively provided. The current-sharing module provides a current-sharing value for a RAMP comparator which controls a PWM generator, and the current-sharing value is compared with RAMP to regulate PWM output so as to regulate current sharing of each phase. The present invention also provides a fast transient droop function by detecting a fast transient droop and adjusting the PWM fast response load from a light load to a heavy load jump and a heavy load jump with a RAMP comparator of a PWM generator.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which like reference numerals generally represent like parts.
FIG. 1 illustrates a prior art multi-phase buck controller;
fig. 2 shows a schematic structural diagram according to an embodiment of the invention.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
Example 1
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 2 shows a multi-phase buck controller structure provided in a first embodiment of the present invention, and for convenience of illustration, only the parts related to the embodiment of the present invention are shown. The multiphase buck controller shown in fig. 2 includes a loop amplifier error amplifier EA unit 110 and an N-stage output stage unit 120, where N is an integer greater than or equal to 2, the 1 st-stage output stage unit includes a four-input comparator 130 and a power stage 140, a first input of the four-input comparator 130 is connected to an output of the power stage unit, a second input is connected to a reference signal, a third input is connected to an output of the loop amplifier error amplifier EA unit, a fourth input is connected to a triangular wave RAMP signal, and an output of the four-input comparator 130 is connected to an input of the power stage 140. In other embodiments, the connection and structure of the loop op-amp error amplifier EA unit 110 may also be different.
The 1 st-stage output stage unit comprises a current-sharing module 150, a four-input comparator 130 and a power stage 140, one input end of the current-sharing module is connected with the output of the current-sharing output stage, the other input end of the current-sharing module is connected with the output of the first-stage output stage, the first input end of the four-input comparator is connected with the output of the current-sharing power stage unit, the second input end of the four-input comparator is connected with the output of the current-sharing module 150, the third input end of the four-stage output stage unit is connected with the output of the loop operational amplifier EA unit 110, the fourth input end of the four-stage output stage unit is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage 140.
The 2 nd-stage output stage unit comprises a current-sharing module 150, a four-input comparator 130 and a power stage 140, wherein one input end of the current-sharing module is connected with the output of the current-sharing output stage, the other input end of the current-sharing module is connected with the output of the first-stage output stage, the first input end of the four-input comparator is connected with the output of the current-sharing power stage unit, the second input end of the four-input comparator is connected with the output of the current-sharing module 150, the third input end of the four-input comparator is connected with the output of the loop operational amplifier EA unit 110, the fourth input end of the four-input comparator is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage 140. In this embodiment, a 4-stage output stage is taken as an example for explanation.
The 3 rd-level output stage unit comprises a current-sharing module 150, a four-input comparator 130 and a power stage 140, wherein one input end of the current-sharing module is connected with the output of the current-sharing output stage, the other input end of the current-sharing module is connected with the output of the first-level output stage, the first input end of the four-input comparator is connected with the output of the current-sharing power stage unit, the second input end of the four-input comparator is connected with the output of the current-sharing module 150, the third input end of the four-input comparator is connected with the output of the loop operational amplifier EA unit 110, the fourth input end of the four-input comparator is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage 140. In this embodiment, a 4-stage output stage is taken as an example for explanation.
The 4 th-stage output stage unit comprises a current-sharing module 150, a four-input comparator 130 and a power stage 140, wherein one input end of the current-sharing module is connected with the output of the current-sharing output stage, the other input end of the current-sharing module is connected with the output of the first-stage output stage, the first input end of the four-input comparator is connected with the output of the current-sharing power stage unit, the second input end of the four-input comparator is connected with the output of the current-sharing module 150, the third input end of the four-input comparator is connected with the output of the loop operational amplifier EA unit 110, the fourth input end of the four-input comparator is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage 140. In this embodiment, a 4-stage output stage is taken as an example for explanation, and in addition, 2 stages or the like are also possible.
In this embodiment, the reference signal of the 1 st-stage output stage unit is preset, and may be set to a current sharing value within an acceptable range, for example.
In another embodiment, the 1 st output stage unit may further include a current-sharing module 150, one input terminal of the current-sharing module 150 is connected to the current-sharing output, the other input terminal is connected to the preset signal, and the second input terminal of the four-input comparator is connected to the output of the current-sharing module.
Further, the 1 st-stage output stage unit may further include a current sampling unit, and the current sampling unit may sample a current flowing through the power tube, so as to obtain a working current flowing through the inductor, and input the sampled current to the current equalizing module, for example, the sampling module may detect the current flowing through the power stage driving unit through a resistor, and convert the current into a voltage form through the resistor after sampling.
Furthermore, the first input end of the four-input comparator can also input a signal sampled by the current sampling unit by the power stage.
When the power tube is in work, the current sampling module can obtain inductive current, so that the inductive current of the current stage and the inductive current of the 1 st stage output stage are equalized, current equalization results of the current stage output terminal and the 1 st stage output terminal are input into the four-input comparator, the pulse amplitude of the RAMP is adjusted by using the current equalization results, the width of final pulses is adjusted, the switching time of the power tube is finally adjusted to adjust the output current of the output stage, and all phases are balanced, for example, the 2 nd stage current and the first stage deviate, the phases are adjusted by using feedback, and all the phases are balanced. The present invention also provides a fast transient droop function by detecting a fast transient droop and adjusting the PWM fast response load from a light load to a heavy load jump and a heavy load jump with a RAMP comparator of a PWM generator.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments.
Claims (6)
1. A multiphase buck controller comprises an EA unit of a loop operational amplifier and an N-stage output stage unit, wherein N is an integer greater than or equal to 2,
the 1 st-stage output stage unit comprises a four-input comparator and a power stage, wherein the first input end of the four-input comparator is connected with the output of the power stage unit, the second input end of the four-input comparator is connected with a reference signal, the third input end of the four-input comparator is connected with the output of the loop operational amplifier (EA) unit, the fourth input end of the four-input comparator is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage;
the Nth-stage output stage unit comprises a current-sharing module, a four-input comparator and a power stage, one input end of the current-sharing module is connected with the output of the current-sharing module, the other input end of the current-sharing module is connected with the output of the first-stage output stage, the first input end of the four-input comparator is connected with the output of the current-sharing module, the second input end of the four-input comparator is connected with the output of the current-sharing module, the third input end of the four-input comparator is connected with the output of the loop operational amplifier (EA) unit, the fourth input end of the four-input comparator is connected with a triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage.
2. The multiphase buck controller according to claim 1, wherein the output stage unit at stage 1 further includes a current equalizing module, one input of the current equalizing module is connected to the output of the current equalizing module, the other input of the current equalizing module is connected to a preset signal, the second input of the four-input comparator is connected to the output of the current equalizing module, and the reference signal is a result of the current equalizing module being output according to the preset signal.
3. The multiphase buck controller according to claim 2, wherein the nth stage output stage unit further comprises a current sampling unit, and the current sampling unit is configured to sample an output current of the output stage and input the sampled output current to the current equalizing module.
4. The multiphase buck controller according to claim 2, wherein the first stage output stage unit further comprises a current sampling unit, and the current sampling unit is configured to sample the output current of the output stage and input the sampled output current to the first input terminal of the four-input comparator.
5. The multiphase buck controller according to claim 3, wherein the output stage further comprises an inductor coupled to an output of the power stage. The multiphase buck controller according to claim 5, wherein the current sampling unit samples the current by sampling the current through the inductor.
6. The multiphase buck controller according to claim 5, wherein the output of the power stage unit is sampled by the current sampling unit and then input to the first input terminal of the four-input comparator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310058279.8A CN115987102A (en) | 2023-01-13 | 2023-01-13 | Multiphase buck controller |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310058279.8A CN115987102A (en) | 2023-01-13 | 2023-01-13 | Multiphase buck controller |
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| CN115987102A true CN115987102A (en) | 2023-04-18 |
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| CN202310058279.8A Pending CN115987102A (en) | 2023-01-13 | 2023-01-13 | Multiphase buck controller |
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