CN219204351U

CN219204351U - Multiphase buck controller

Info

Publication number: CN219204351U
Application number: CN202320111764.2U
Authority: CN
Inventors: 郑广伟
Original assignee: Shanghai Heliwei Semiconductor Co ltd
Current assignee: Shanghai Heliwei Semiconductor Co ltd
Priority date: 2023-01-13
Filing date: 2023-01-13
Publication date: 2023-06-16
Anticipated expiration: 2033-01-13

Abstract

The utility model discloses a multiphase buck controller, which comprises a loop operational amplifier (EA) unit and an N-stage output stage unit, wherein N is an integer greater than or equal to 2, the output stage unit comprises a current equalizing module, four input comparators and a power stage, one input end of the current equalizing module is connected with the output of the current equalizing module, the other input end is connected with the output of the first-stage output stage, the first input end of the four input comparators is connected with the output of the current equalizing module, the second input end is connected with the output of the loop operational amplifier (EA) unit, the fourth input end is connected with a triangular wave RAMP signal, the output end of the four input comparators is connected with the input end of the power stage, and inductance current change is acquired by the four input comparators through a current sampling unit and four-phase current equalizing is carried out through the current equalizing module.

Description

Multiphase buck controller

Technical Field

The utility model mainly relates to the field of power management, in particular to a multiphase buck controller.

Background

With the rapid development of consumer electronics, there is also an increasing demand and performance requirement for integrated voltage modulators (IntegradedVoltageRegulator, IVR) in power management integrated circuits (PowerManagement Integrated Circuit, PMIC) in electronics. The method has the advantages that higher requirements are also put on the output load capacity of the IVR, the main trend is to achieve the improvement of the load capacity through a multiphase buck controller mode, and meanwhile, the transient jump response of the IVR to an output load is required to be as high as possible, and the common method is to improve the switching frequency of the IVR or increase the loop bandwidth. For scenarios requiring IVR output load capacity up to tens to hundreds of amps, the number of DCDC circuits in parallel is required to reach 16, 32 or more phases. 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 (ErrorAmplifier) is connected to negative terminals of four comparators COMP (Comparator), positive terminals of COMP are respectively connected to a preset triangular wave signal VSAW, so as to respectively generate square wave voltage signals with a predetermined duty ratio, and 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, so that in order to ensure output balance of each phase, a feedback compensation unit 10 is set at the EA terminal or the triangular wave terminal to perform compensation adjustment.

Disclosure of Invention

In order to solve the load loss caused by a feedback compensation circuit to a multiphase buck controller, the utility model provides the multiphase buck controller, which comprises a loop operational amplifier (EA) unit 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 four input comparators and a power stage, the first input ends of the four input comparators are connected with the output of the power stage unit of the present stage, the second input ends are connected with reference signals, the third input ends are connected with the output of the loop operational amplifier (EA) unit, the fourth input ends are connected with triangular wave RAMP signals, and the output ends of the four input comparators are connected with the input ends of the power stage; the N-th level output stage unit comprises a current equalizing module, four input comparators and a power stage, wherein one input end of the current equalizing module is connected with the output of the current level, the other input end of the current equalizing module is connected with the output of the first level output stage, the first input end of the four input comparators is connected with the output of the current level unit, the second input end of the four input comparators is connected with the output of the reference voltage signal current equalizing module, the third input end of the four input comparators is connected with the output of the loop operational amplifier EA unit, the fourth input end of the four input comparators is connected with the input end of the power stage.

According to the utility model, the four-input comparator is utilized to collect inductance current change through the current sampling unit and perform four-phase current sharing through the current sharing module, a current sharing result is fed back to each phase control loop, and PWM of each phase is regulated to enable each phase current to be distributed and balanced, so that power supply output is effectively provided. The current sharing module provides the current sharing value to a RAMP comparator for controlling the PWM generator, and the current sharing value is compared with the RAMP to adjust PWM output so as to adjust each phase of current sharing. The utility model also provides a fast transient low drop function by detecting the fast transient low drop and adjusting the PWM fast response load jump from light load to heavy load and heavy load jump through a RAMP comparator with the PWM generator.

Drawings

The foregoing and other objects, features and advantages of the utility model will be apparent from the following more particular descriptions of exemplary embodiments of the utility model as illustrated in the accompanying drawings wherein like reference numbers generally represent like parts throughout the exemplary embodiments of the utility model.

FIG. 1 illustrates a prior art multiphase buck controller;

fig. 2 shows a schematic structural diagram according to an embodiment of the utility model.

Detailed Description

The utility model will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present utility model are illustrated in the drawings, it should be understood that the present utility model 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 utility model to those skilled in the art.

Example 1

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Fig. 2 shows a multiphase buck controller structure provided in the first embodiment of the present utility model, and for convenience of explanation, only the portions relevant to the embodiments of the present utility model are shown. The multiphase buck controller shown in fig. 2 comprises a loop operational amplifier EA unit 110, 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 comprises a four-input comparator 130 and a power stage 140, a first input terminal of the four-input comparator 130 is connected with an output of the power stage unit of the present stage, a second input terminal is connected with a reference signal, a third input terminal is connected with an output of the loop operational amplifier EA unit, a fourth input terminal is connected with a triangular wave RAMP signal, and an output terminal of the four-input comparator 130 is connected with an input terminal of the power stage 140. In other embodiments, the connection and structure of the loop op-amp EA unit 110 may be different.

The 1 st output stage unit comprises a current equalizing module 150, a four-input comparator 130 and a power stage 140, wherein one input end of the current equalizing module is connected with the output of the current output stage, the other input end of the current equalizing module is connected with the output of the first output stage, the first input end of the four-input comparator is connected with the output of the current output stage unit, the second input end of the four-input comparator is connected with the output of the current equalizing 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 the input end of the power stage 140.

The 2 nd stage output stage unit comprises a current equalizing module 150, a four-input comparator 130 and a power stage 140, wherein one input end of the current equalizing module is connected with the output of the current stage output stage, the other input end of the current equalizing 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 stage unit, the second input end of the four-input comparator is connected with the output of the current equalizing 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 the input end of the power stage 140. In this embodiment, a 4-stage output stage is described as an example.

The 3 rd stage output stage unit comprises a current equalizing module 150, a four-input comparator 130 and a power stage 140, wherein one input end of the current equalizing module is connected with the output of the current stage output stage, the other input end of the current equalizing 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 stage unit, the second input end of the four-input comparator is connected with the output of the current equalizing 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 the input end of the power stage 140. In this embodiment, a 4-stage output stage is described as an example.

The 4 th stage output stage unit comprises a current equalizing module 150, a four-input comparator 130 and a power stage 140, wherein one input end of the current equalizing module is connected with the output of the current stage output stage, the other input end of the current equalizing 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 stage unit, the second input end of the four-input comparator is connected with the output of the current equalizing 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 the input end of the power stage 140. In the present embodiment, the 4-stage output stage is exemplified, but the output stage may be 2 stages.

In this embodiment, the reference signal of the 1 st stage output stage unit is preset, for example, may be set to a uniform current value within an acceptable range.

In this embodiment, the further 1 st output stage unit may further include a current sharing module 150, where one input end of the current sharing module 150 is connected to the current stage output, the other input end is input with a preset signal, and the second input end of the four-input comparator is connected to the output of the current sharing module.

Furthermore, the 1 st output stage unit may further include a current sampling unit, where 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 obtained 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, so that the current is converted into a voltage form through the resistor after sampling.

Further, the first input terminal of the four-input comparator may also input a signal of which the power stage is sampled by the current sampling unit.

When the current sampling module works, the inductance current can be obtained, so that the inductance current of the current stage and the inductance current of the 1 st output stage are subjected to current sharing, the current sharing result of the current stage output end and the 1 st output end is input into the four-input comparator, so that the pulse amplitude of RAMP is adjusted by using the current sharing result, the width of final pulse is adjusted, the switching time of the power tube is finally adjusted to adjust the output current of the output stage, each phase is balanced, for example, the current of the 2 nd stage and the first stage deviate, and the feedback is used for adjustment, so that each phase is balanced. The utility model also provides a fast transient low drop function by detecting the fast transient low drop and adjusting the PWM fast response load jump from light load to heavy load and heavy load jump through a RAMP comparator with the PWM generator.

The foregoing description of embodiments of the utility model has been presented for purposes of illustration and description, and is not intended to be exhaustive or 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 various embodiments described.

Claims

1. A multiphase buck controller comprises a loop operational amplifier (EA) unit and an N-stage output stage unit, wherein N is an integer greater than or equal to 2,

the 1 st 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 of the first stage, 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 the triangular wave RAMP signal, and the output end of the four-input comparator is connected with the input end of the power stage;

the N-stage output stage unit comprises a current equalizing module, four input comparators and a power stage, wherein one input end of the current equalizing module is connected with the output of the current stage, the other input end of the current equalizing module is connected with the output of the first-stage output stage, the first input end of the four input comparators is connected with the output of the current stage unit, the second input end of the four input comparators is connected with the output of the current equalizing module, the third input end of the four input comparators is connected with the output of the loop operational amplifier EA unit, the fourth input end of the four input comparators is connected with the input end of the power stage.

2. The multiphase buck controller according to claim 1, wherein the 1 st stage output stage unit further includes a current sharing module, one input terminal of the current sharing module is connected to the current stage output, the other input terminal is connected to a preset signal, the second input terminal of the four-input comparator is connected to the output of the current sharing module, and the reference signal is a result output by the current sharing module according to the preset signal.

3. The multiphase buck controller according to claim 2, wherein the nth stage output stage unit further includes a current sampling unit for sampling the output current of the output stage and inputting the sampled output current to the current sharing module.

4. The multiphase buck controller according to claim 2, wherein the 1 st stage output stage unit further includes a current sampling unit for sampling the output current of the output stage and inputting it to the first input of the four-input comparator.

5. A multiphase buck controller according to claim 3, wherein the output stage further includes an inductor coupled to the output of the power stage.

6. The multiphase buck controller according to claim 5, wherein the current sampling unit performs current sampling by sampling current flowing through the inductor.

7. The multiphase buck controller according to claim 5, wherein the output of the current sampling unit is sampled and input to the first input of the four-input comparator.