CN113507208B - Multiphase series capacitor DC-DC converter and control method - Google Patents

Multiphase series capacitor DC-DC converter and control method Download PDF

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CN113507208B
CN113507208B CN202110754200.6A CN202110754200A CN113507208B CN 113507208 B CN113507208 B CN 113507208B CN 202110754200 A CN202110754200 A CN 202110754200A CN 113507208 B CN113507208 B CN 113507208B
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load
circuit
transient
phase
power
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CN113507208A (en
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程林
吴枫
苑竞艺
刘泽国
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Chen Song
Cheng Lin
Hefei Chengling Microelectronics Co ltd
Wu Feng
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University of Science and Technology of China USTC
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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
    • H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
    • H02M3/07—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode, e.g. charge pumps
    • 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
    • H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
    • 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

Abstract

A multiphase series capacitor dc-dc converter comprising: the power stage circuit is used for converting input direct-current voltage into stable direct-current voltage required by a load, and at least comprises two phase inductors, phase difference of preset intervals exists between currents of the two phase inductors and is used for sequentially and alternately charging the load, a bidirectional switch is arranged between every two adjacent phase inductors, and when the bidirectional switch is switched on, the corresponding two phase inductors simultaneously charge the load; and the load transient response circuit is used for controlling the conduction of at least one bidirectional switch when the forward jump of the load transient occurs, so that at least two phases of inductors charge the load at the same time, and the transient change of the load is responded quickly. The disclosure also provides a control method of the converter, which can realize quick response to load transient change.

Description

Multiphase series capacitor DC-DC converter and control method
Technical Field
The disclosure relates to the field of electronic technologies, and in particular, to a multiphase series capacitor dc-dc converter and a control method.
Background
The existing multiphase series capacitor dc-dc converter is usually optimized for a control loop to improve the load transient response speed, but the load transient response speed is still limited by the rising slope of the inductor current. The traditional transient enhancement technology improves the rising slope of the inductive current by improving the switching frequency, however, the improvement of the switching frequency further compresses the conduction time of the power tube, and extremely high challenges are provided for the design of a control circuit and a driving circuit; the improvement of the switching frequency greatly increases the switching loss of the power tube and deteriorates the conversion efficiency. In order to avoid overlapping conduction time of the multiphase power tube, a power tube control signal needs to keep a fixed phase difference of 360 degrees/N, N-phase induction current cannot be used for charging a load at the same time, and the transient response speed of the load is limited.
Disclosure of Invention
In view of the above problems, the present invention provides a multiphase series capacitor dc-dc converter and a control method thereof, so as to at least partially solve the above technical problems.
One aspect of the present disclosure provides a multiphase series capacitor dc-dc converter, comprising: the power stage circuit is used for converting input direct-current voltage into stable direct-current voltage required by a load, and at least comprises two-phase inductors, phase difference of preset intervals exists between currents of the two-phase inductors and is used for sequentially and alternately charging the load, two-way switches are arranged between every two adjacent two-phase inductors, and when the two-way switches are switched on, the corresponding two-phase inductors simultaneously charge the load; and the load transient response circuit is used for controlling at least one bidirectional switch to be conducted when the load transient forward jump occurs, so that at least two phases of inductors charge the load at the same time, and the transient change of the load is responded quickly.
Optionally, the load transient response circuit comprises: the error amplifier is used for calculating the error between the output voltage of the power level circuit and the reference voltage to obtain an error signal; the transient detection circuit is used for judging whether the load generates transient forward jump according to the error signal; the transient enhancement logic circuit is used for generating a control signal for controlling the conduction of the bidirectional switch when the transient forward jump of the load is detected; and the driving circuit is used for controlling the conduction of at least one bidirectional switch according to the control signal.
Optionally, when a load transient forward jump occurs, after at least one of the bidirectional switches is turned on, the two phases of the inductors connected to the turned-on bidirectional switches are connected in parallel.
Optionally, the load transient response circuit further comprises: the conduction time generating circuit is used for generating control signals of a power tube of a circuit where each phase of inductor is located according to the error signals, and each control signal is respectively used for controlling the circuit where each phase of inductor is located to be conducted so as to enable each phase of inductor to charge the load in sequence and alternately; and the driving circuit is also used for controlling a power switch arranged on a circuit where the inductor of each phase is positioned according to the control signal of each phase when the transient forward jump of the load does not occur, so that the inductors of each phase charge the load in turn and alternately.
Optionally, the sub-circuit of the power stage circuit in which at least one phase of inductance is located includes: power switch AH, power switch AL and filter inductor LbSequentially connecting; the sub-circuit where the other at least one phase of inductor adjacent to the inductor is located comprises: power switch BH, capacitor CFPower switch BL and filter inductor LaAre connected in sequence; wherein the power switch AH and the capacitor CFThe input ends of the power switches BH and AH are respectively used for controlling the voltage input of the corresponding sub-circuits; the filter inductor LbAnd a filter inductor LaThe output ends of the power stage circuits are connected with the output port of the power stage circuit; the filter inductor LbAnd a filter inductance LaThe bidirectional switch is arranged between the input ports; and the output port of the power level circuit is also provided with a grounded filter capacitor C.
Optionally, after a load transient forward transition occurs, the driving circuit is further configured to turn off the power switch BL, the power switch AH, and the power switch AL in the two-phase sub-circuit connected to the turned-on at least one bidirectional switch, and drive the power switch BH to generate a voltage input pulse in response to the load transient forward transition.
In another aspect of the present disclosure, a control method is provided, which is applied to the multiphase series capacitor dc-dc converter according to the first aspect, and includes: when the transient forward jump of the load is detected, the bidirectional switch between at least two adjacent inductors in the power level circuit is controlled to be conducted, so that the at least two adjacent inductors charge the load at the same time, and the transient change of the load is quickly responded.
Optionally, the method further comprises: when the load works normally, the bidirectional switch is controlled to be switched off, and the inductors of all phases are controlled to charge the load in sequence and alternately.
Optionally, when detecting that the load has a transient forward jump, the method further includes: and turning off a power switch BL, a power switch AH and a power switch AL on a two-phase sub-circuit connected with the conducted at least one bidirectional switch in the power level circuit, and driving a power switch BH to generate a voltage input pulse responding to the transient forward jump of the load.
Optionally, the controlling the bidirectional switch between at least two adjacent inductors in the power stage circuit to be turned on when the transient forward jump of the load occurs includes: calculating an error between the output voltage of the power level circuit and a reference voltage to obtain an error signal; judging whether the load generates transient forward jump according to the error signal; when the transient forward jump of the load is detected, a control signal for controlling the conduction of the bidirectional switch is generated; and controlling at least one bidirectional switch to be conducted according to the control signal.
The at least one technical scheme adopted in the embodiment of the disclosure can achieve the following beneficial effects:
according to the multiphase series capacitor DC-DC converter and the control method thereof, when the load has transient jump, the phase interleaving clock of at least two phase structures is removed, the delay time of phase interleaving is eliminated, at least two phase inductors are used for charging the load at the same time, the rising slope of the inductor current is expanded by at least one time, and the transient response speed of the load is greatly improved.
Drawings
For a more complete understanding of the present disclosure and the advantages thereof, reference is now made to the following descriptions taken in conjunction with the accompanying drawings, in which:
FIG. 1 schematically illustrates a circuit schematic of a conventional two-phase series capacitor DC-DC converter;
fig. 2 schematically illustrates a load transient jump response graph of a conventional two-phase series capacitor dc-dc converter;
fig. 3 schematically illustrates a circuit schematic of a multiphase series capacitor dc-dc converter provided by an embodiment of the present disclosure;
fig. 4 schematically illustrates an operation diagram of a power stage circuit provided by an embodiment of the present disclosure during a transient jump of a load;
fig. 5 schematically illustrates a signal diagram of a multiphase series capacitor dc-dc converter provided by an embodiment of the present disclosure;
fig. 6 schematically illustrates a load transient step response graph of a multiphase series capacitor dc-dc converter provided by an embodiment of the present disclosure;
fig. 7 schematically illustrates a topology diagram of a power stage circuit of a multiphase series capacitor dc-dc converter provided by an embodiment of the present disclosure;
fig. 8 schematically illustrates a flowchart of a control method of a multiphase series capacitor dc-dc converter according to an embodiment of the present disclosure.
Detailed Description
Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that these descriptions are illustrative only and are not intended to limit the scope of the present disclosure. In the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.
All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It is noted that the terms used herein should be interpreted as having a meaning that is consistent with the context of this specification and should not be interpreted in an idealized or overly formal sense.
For a conventional Buck DC-DC converter, the slope m and ripple Δ i of the inductor currentLCan be expressed as:
m＝(Vin-Vout)/L (1)
ΔiL＝m×DT (2)
Vinis the converter input voltage, VoutIs the converter output voltage, L is the inductance value, D represents the duty cycle of the power tube control signal, D ═ Vout/VinD < 1, T is the switching period of the converter, and DT represents the conduction time of the power tube per period. From equation (1), the inductor current slope is inversely proportional to the inductance value. The slope of the inductor current represents the current capacity of the inductor for charging the load when the load has transient jump, the larger the slope is, the larger the charging current for the load is, the faster the recovery speed of the output voltage is, the smaller the voltage drop is, and the higher the transient response speed of the load is. According to the formula (2), when the load has transient jump, the larger the duty ratio D is, the longer the charging time DT to the load capacitor in a single period is, the faster the recovery speed of the output voltage is, and the higher the transient response speed of the load is.
Fig. 1 schematically illustrates a circuit schematic diagram of a conventional two-phase series capacitor dc-dc converter provided by an embodiment of the present disclosure.
As shown in fig. 1, for a two-phase series capacitor dc-dc converter, the most direct method for increasing the transient response speed of the load is to increase the switching frequency of the converter, and select a smaller filter inductance value to increase the rising slope of the inductor current on the premise of keeping the ripple of the inductor current unchanged.
For a conventional two-phase series capacitor dc-dc converter, L is shown in fig. 1a、LbC is filter inductance and capacitance, BH, BL, AH and AL are power switches, and the equivalent parasitic capacitances of switch nodes SW1, SW2 and SW3 are respectively Coss1、Coss2And Coss3. In an application environment with a large conversion ratio, the power supply voltage is high, and the power switch often adopts a LDMOSFET (Laterally Diffused Metal-Oxide Semiconductor Field Effect Transistor), which results in parasitic capacitances C1, SW2 and SW3oss1、Coss2And Coss3The capacity value is large. When BH switches with BL, AH switches with AL switches, in capacitor Coss1、Coss2And Coss3The charge on the capacitor is discharged and wasted, and the energy loss can reach Coss1Vin 2fs+Coss2Vin 2fs+Coss3Vin 2fsTherefore, higher switching frequency leads to greater switching loss, which severely reduces energy conversion efficiency.
Fig. 2 schematically illustrates a load transient jump response graph of a conventional two-phase series capacitor dc-dc converter provided in an embodiment of the present disclosure.
As shown in fig. 2, for the two-phase series capacitor dc-dc converter, the two-phase inductors cannot charge the load at the same time due to the inherent 180 ° phase difference of the two-phase structure, so that there is a space for optimizing the transient response speed of the load.
The embodiment of the disclosure provides a direct current-direct current converter with fast load transient response, which realizes fast load transient response without increasing switching frequency, and has simple circuit and reduced cost; meanwhile, the circuit can be applied to a topological structure of a multiphase series capacitor DC-DC converter and has expansibility.
Fig. 3 schematically illustrates a circuit schematic diagram of a multiphase series capacitor dc-dc converter provided in an embodiment of the present disclosure.
It should be noted that the present disclosure provides a multiphase series capacitor dc-dc converter, and for convenience of illustration, fig. 3 only shows a two-phase multiphase series capacitor dc-dc converter.
As shown in fig. 3, the dc-dc converter includes two parts, a power stage circuit 210 and a load transient response circuit 220.
The power stage circuit 210 is configured to convert an input dc voltage into a stable output dc voltage with ripples, where the power stage circuit 210 at least includes a two-phase inductor, and there is a phase difference at preset intervals between inductor currents of the phases, so as to charge a load alternately in sequence, for example, when the power stage circuit 210 includes only a two-phase inductor, the phase difference between the inductor currents of the phases is 180 ° and when the power stage circuit 210 includes a three-phase inductor, the phase difference between the inductor currents of the phases is 120 °. A bidirectional switch S is arranged between each two adjacent phase inductorstranWhen said two-way switch StranWhen conducting, with the conducting bidirectional switch StranThe two connected inductors are connected in parallel, and the two corresponding inductors charge the load at the same time.
A load transient response circuit 220 for controlling at least one of the bidirectional switches S when a load transient forward jump occurstranAnd conducting to enable the at least two-phase inductor to simultaneously charge the load so as to quickly respond to transient change of the load.
As shown in FIG. 3, the power stage circuit 210 is composed of four power switches AH, AL, BH and BL, and a flying capacitor CFAnd two filter inductors LaAnd LbAnd (4) forming. In particular, the circuit further includes a bi-directional switch S connected in parallel between two switch nodes SW1, SW2tran. The bidirectional switch StrahCan be connected together by connecting the source terminals of two N-type LDMOSFETs. When the grid source voltage is high level, the two switches are both opened, and at the moment, the two switches are both in a conducting state; when the grid source voltage is low level, the two switches are turned off, and the body diode of at least one N-type LDMOSFET is reversely biased, so that the bidirectional switch S can be ensuredtranIn an off state, here to the bidirectional switch StranThe type of switch of (2) is not limited.
Specifically, the sub-circuit in which at least one phase of inductance of the power stage circuit is located comprises: power switch AH and power switchAL and a filter inductor LbAre connected in sequence; the sub-circuit where the other at least one phase of inductor adjacent to the inductor is located comprises: power switch BH, capacitor CFA power switch BL and a filter inductor LaSequentially connecting; wherein the power switch AH and the capacitor CFThe input ends of the power switches BH and AH are respectively used for controlling the voltage input of the corresponding sub-circuits; the filter inductor LbAnd a filter inductor LaThe output ends of the power stage circuits are connected with the output port of the power stage circuit; the filter inductor LbAnd a filter inductance LaIs provided with the bidirectional switch S between the input portstran(ii) a And the output port of the power level circuit is also provided with a grounded filter capacitor C.
The bidirectional switch StranThe method is used for realizing short circuit of two-phase switch nodes when the load has transient jump, removing two-phase staggered clocks, and synchronously charging the load by using two-phase inductive current, wherein a specific load transient jump response curve is shown in fig. 6.
As shown in fig. 3, the load transient response circuit 220 includes: an error amplifier 221, an on-time generation circuit 222, a transient detection circuit 223, a transient enhancement logic circuit 224, and a driving circuit 225.
An error amplifier 221 for calculating the output voltage V of the power stage circuitFBAnd a reference voltage VREFError between, obtaining an error signal VEA。
A turn-on time generation circuit 222 for generating the error signal V according to the error signalEAAnd generating control signals of a high-side power tube of a circuit in which each phase of inductor is positioned, wherein each control signal is respectively used for controlling the circuit in which each phase of inductor is positioned to be conducted so as to enable each phase of inductor to sequentially and alternately charge the load.
A transient detection circuit 223 for detecting a transient state based on the error signal VEAAnd judging whether the load generates transient forward jump or not. In particular, when the error signal V isEAGreater than a predetermined signal VLAnd judging that the load has transient forward jump. Wherein, when the load is judged to generate transient forward jump, the transient is outputThe state detection signal Tran _ Detected is high, otherwise, the output is low. When the transient detection signal is at high level, a built-in monostable circuit is triggered, and the signal cannot be triggered again within the rated time.
And the transient enhancement logic circuit 224 is used for generating a control signal for controlling the conduction of the bidirectional switch when the transient forward jump of the load is detected.
And a driving circuit 225, configured to control at least one of the bidirectional switches to be turned on according to the control signal.
The driving circuit 225 is further configured to be turned on by at least one of the bidirectional switches S when a load transient forward transition occurstranAnd the power switch BL, the power switch AH and the power switch AL on the connected two-phase sub-circuit are closed, and the power switch BH is driven to generate a voltage input pulse responding to the transient forward jump of the load.
When no transient forward jump of the load occurs, the driving circuit 225 is further configured to control the power switches on and off of the circuits in which the inductors of the respective phases are located according to control signals of the power transistors of the circuits in which the inductors of the respective phases are located, that is, control the on-time of the power switches on the circuits in which the inductors of the respective phases are located, so that the inductors of the respective phases charge the load in sequence and alternately.
In the embodiment of the disclosure, it is ensured that when a load transient forward jump is detected, the power tube BL of the first phase and the power tubes AH, AL of the second phase are turned off, and S for releasing the two-phase staggered clock is generatedtranA control signal.
In addition, the driving circuit 225 is further configured to control the power switches disposed on the circuits where the inductors of the respective phases are located to sequentially and alternately charge the load when no transient forward jump of the load occurs.
Fig. 4 schematically illustrates an operation diagram of a power stage circuit provided by the embodiment of the disclosure in response to a load transient jump; fig. 5 schematically illustrates a signal diagram of a multiphase series capacitor dc-dc converter provided by an embodiment of the present disclosure; fig. 6 schematically illustrates a load transient step response graph of the multiphase series capacitor dc-dc converter provided in the embodiment of the present disclosure.
Referring to fig. 4, 5 and 6, wherein the gray portion of fig. 4 represents the power transistor being turned off, BH, BL, AH and AL of fig. 5 correspond to the gate control signal, S, of the corresponding power transistor in fig. 6tranRepresenting a bidirectional switch StranWhen the transient detection signal Tran _ Detected is at high level, the control signal SBH of the first phase power tube BH and the bidirectional switch S are enabledtranThe control signal Tran _ EN is high level, the control signal SAH of the second phase is low level, and the gate control signal of each phase of power tube and the bidirectional switch S based on the Tran _ EN signal are respectively obtained through a driving circuittranA grid end control signal is used for closing power tubes AH, AL and BL and opening a power tube BH and a two-phase switch Stran. Referring to fig. 6, a bidirectional switch StranAnd turning on, namely, simultaneously charging the load by using the two-phase inductors, eliminating the time delay caused by the existing two-phase staggered clock, and accelerating the transient response speed of the load, wherein referring to fig. 5, the first-phase power tube BH responds to a control signal SBH to prolong the turn-on time so as to respond to the transient change of the load and provide corresponding energy for the load.
In the embodiment of the present disclosure, during the transient forward jump, the two-phase inductor may charge the load capacitor at the same time, which is equivalently that the two-phase inductor is connected in parallel, and the rising slope of the inductor current is formula (3):
Figure BDA0003141544940000091
wherein D is the duty ratio of the power tube BH in a steady state.
In the conventional two-phase series capacitor dc-dc converter, during the transient forward jump of the load, the rising slope of the inductor current is represented by formula (4):
Figure BDA0003141544940000092
as can be seen from equations (3) and (4), when the load has a transient forward jump, the multiphase series capacitor dc-dc converter provided by the present disclosure releases the two-phase staggered clock, charges the load with the two-phase inductor at the same time, doubles the rising slope of the inductor current, and has a fast load transient response capability. Correspondingly, when the converter is an N-phase series capacitor type direct current-direct current converter and transient jump occurs to a load, the load can be charged by utilizing the N-phase inductor, so that the rising slope of the inductive current is enlarged by N times, the fast load transient response capability is realized, the application range is wide, and the expansibility is realized.
Fig. 7 schematically illustrates a schematic diagram of a topology of a power stage circuit provided by an embodiment of the disclosure.
As shown in fig. 7, the present disclosure also provides various topologies of the power stage circuit, where (1) shows a multiphase series capacitor topology, (2) schematically shows a series capacitor +3-level mixed topology, (3) schematically shows a simplified version of the multiphase series capacitor topology, and (4) schematically shows a dual-inductor mixed Dickson topology. The topology of the power stage circuit provided by the present embodiment is not limited to the several configurations shown in fig. 7, but can achieve the effect that the multiphase inductor charges the load simultaneously by closing the bidirectional switch to rapidly correspond to the transient change of the load.
The topological structure of the multiphase series capacitor direct current-direct current converter provided by the disclosure can be a boost type and buck type multiphase series capacitor power stage circuit, and when the power stage circuit is the boost type multiphase series capacitor topological structure shown in (5) in fig. 7, the multiphase series capacitor direct current-direct current converter provided by the disclosure generates transient negative jump on a load, removes multiphase staggered clocks, discharges the load by utilizing a multiphase inductor at the same time, doubles the current reduction slope of the inductor, and has the capability of fast transient response of the load.
Fig. 8 schematically illustrates a flowchart of a control method of a multiphase series capacitor dc-dc converter according to an embodiment of the present disclosure.
As shown in fig. 8, the control method includes S810.
And S810, when the transient forward jump of the load is detected, controlling a bidirectional switch between at least two adjacent inductors in the power level circuit to be conducted, so that the at least two adjacent inductors charge the load at the same time, and the transient change of the load is quickly responded.
In the disclosed embodiment, in response to a load transient forward jump, at least one bidirectional switch in a power circuit of a converter as shown in fig. 3 may be controlled to close, so that at least two-phase inductors simultaneously charge a load to increase a corresponding speed by at least one time.
Specifically, in S810, when detecting that the load has a transient forward transition, the method further includes:
and S811, turning off the power switch BL, the power switch AH and the power switch AL on the two-phase sub-circuit connected with the at least one conducted bidirectional switch in the power stage circuit, and driving the power switch BH to generate a voltage input pulse responding to the transient forward jump of the load.
In S810, when detecting a transient forward jump of the load, controlling the bidirectional switch between at least two adjacent inductors in the power stage circuit to be turned on specifically includes S812 to S815.
And S812, calculating an error between the output voltage of the power level circuit and the reference voltage to obtain an error signal.
And S813, judging whether the load has transient forward jump according to the error signal.
When the error signal exceeds the rated amplitude VL, judging that the load current generates transient forward jump, outputting a transient detection signal Tran _ Detected to be high level, if the error signal does not exceed the rated amplitude VL, judging that the load current does not generate transient forward jump, and outputting a transient detection signal Tran _ Detected to be low level.
And S814, when the transient forward jump of the load is detected, generating a control signal for controlling the conduction of the bidirectional switch.
And S815, controlling at least one bidirectional switch to be conducted according to the control signal.
When the transient detection signal Tran _ Detected is high level, the power tube BL of the first phase and the two power tubes AH and AL of the second phase are closed, and the bidirectional switch S is triggeredtranConducting, charging the load by two-phase inductive currentAnd realizing the transient enhancement effect.
The method further includes S820:
and S820, when the load works normally, controlling the bidirectional switch to be switched off, and controlling the inductors of all phases to charge the load in sequence and alternately.
When the load has transient forward jump and returns to normal, the driving circuit 225 controls the bidirectional switch to be turned off, and the power switch BL, the power switch BH, the power switch AH and the power switch AL are controlled by the two-phase control signals SBH and SAH to be turned on in sequence, so as to return the phase difference of the inductor current of each phase and charge the load alternately in sequence.
It will be appreciated by a person skilled in the art that various combinations or/and combinations of features recited in the various embodiments of the disclosure and/or in the claims may be made, even if such combinations or combinations are not explicitly recited in the disclosure. In particular, various combinations and/or combinations of the features recited in the various embodiments and/or claims of the present disclosure may be made without departing from the spirit or teaching of the present disclosure. All such combinations and/or associations are within the scope of the present disclosure.
While the disclosure has been shown and described with reference to certain exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the disclosure as defined by the appended claims and their equivalents. Accordingly, the scope of the present disclosure should not be limited to the above-described embodiments, but should be defined not only by the appended claims, but also by equivalents thereof.

Claims (10)

1. A multiphase series capacitor dc-dc converter, comprising:
the power stage circuit is used for converting input direct-current voltage into stable direct-current voltage required by a load, and comprises at least two phase inductors, phase difference of preset intervals exists between currents of the two phase inductors and is used for charging the load in sequence and alternately, a two-way switch is arranged between every two adjacent phase inductors, and when the two-way switches are conducted, the corresponding two phase inductors simultaneously charge the load;
and the load transient response circuit is used for controlling at least one bidirectional switch to be conducted when the forward jump of the load transient occurs, so that at least two phases of inductors charge the load at the same time, and the transient change of the load is responded quickly.
2. The converter of claim 1, wherein the load transient response circuit comprises:
the error amplifier is used for calculating the error between the output voltage of the power level circuit and the reference voltage to obtain an error signal;
the transient detection circuit is used for judging whether the load generates transient forward jump according to the error signal;
the transient enhancement logic circuit is used for generating a control signal for controlling the conduction of the bidirectional switch when the transient forward jump of the load is detected;
and the driving circuit is used for controlling the conduction of at least one bidirectional switch according to the control signal.
3. The converter according to claim 2, wherein when a load transient forward transition occurs, at least one of said bidirectional switches is turned on, and then two of said inductors connected to said turned on bidirectional switches are connected in parallel.
4. The converter of claim 2, wherein the load transient response circuit further comprises:
the conduction time generating circuit is used for generating control signals of a power tube of a circuit where each phase of inductor is located according to the error signals, and each control signal is respectively used for controlling the circuit where each phase of inductor is located to be conducted so as to enable each phase of inductor to charge the load in sequence and alternately;
and the driving circuit is also used for controlling the on-off of a power switch arranged on a circuit where the inductor of each phase is positioned according to the control signal of each phase when the transient forward jump of the load does not occur, so that the inductors of each phase charge the load in turn and alternately.
5. The converter according to claim 2, wherein the sub-circuit of the power stage circuit in which at least one phase of inductance is located comprises:
power switch AH, power switch AL and filter inductor LbSequentially connecting;
the sub-circuit where the other at least one phase of inductor adjacent to the inductor is located comprises:
power switch BH, capacitor CFPower switch BL and filter inductor LaSequentially connecting;
wherein the power switch AH and the capacitor CFThe input ends of the power switches BH and AH are respectively used for controlling the voltage input of the corresponding sub-circuits; the filter inductor LbAnd a filter inductance LaThe output ends of the power stage circuits are connected with the output port of the power stage circuit; the filter inductor LbAnd a filter inductor LaThe bidirectional switch is arranged between the input ports; and the output port of the power level circuit is also provided with a grounded filter capacitor C.
6. The converter of claim 5, wherein the driving circuit is further configured to turn off the power switch BL, the power switch AH, and the power switch AL in the two-phase sub-circuit connected to the conducting at least one bidirectional switch after the load transient forward transition occurs, and to drive the power switch BH to generate a voltage input pulse in response to the load transient forward transition.
7. The multiphase series capacitor dc-dc converter control method applied to the multiphase series capacitor dc-dc converter according to any one of claims 1 to 6, comprising:
when the transient forward jump of the load is detected, the bidirectional switch between at least two adjacent inductors in the power level circuit is controlled to be conducted, so that the at least two adjacent inductors charge the load at the same time, and the transient change of the load is quickly responded.
8. The control method according to claim 7, characterized by further comprising:
when the load works normally, the bidirectional switch is controlled to be switched off, and the inductors of all phases are controlled to charge the load in sequence and alternately.
9. The control method of claim 8, wherein when detecting a transient forward jump in the load, further comprising:
and turning off a power switch BL, a power switch AH and a power switch AL on a two-phase sub-circuit connected with the conducted at least one bidirectional switch in the power level circuit, and driving a power switch BH to generate a voltage input pulse responding to the transient forward jump of the load.
10. The method of claim 7, wherein controlling the bidirectional switch between at least two adjacent inductors of the power stage circuit to conduct when detecting a transient forward jump of the load comprises:
calculating an error between the output voltage of the power level circuit and a reference voltage to obtain an error signal;
judging whether the load generates transient forward jump according to the error signal;
when the transient forward jump of the load is detected, a control signal for controlling the conduction of the bidirectional switch is generated;
and controlling at least one bidirectional switch to be conducted according to the control signal.
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CN113014098A (en) * 2021-04-09 2021-06-22 哈尔滨工业大学（威海） Fuzzy self-tuning PID control algorithm for staggered parallel bidirectional DC/DC converter

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CN108880247A (en) * 2017-05-16 2018-11-23 马克西姆综合产品公司 Support DC to the DC converter and associated method of continuous conduction mode
CN110165892A (en) * 2019-06-14 2019-08-23 上海南芯半导体科技有限公司 A kind of mixing capacitor and inductor step-down conversion circuit and implementation method
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