CN116054543B - Multiphase buck converter and current control method - Google Patents
Multiphase buck converter and current control method Download PDFInfo
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- CN116054543B CN116054543B CN202310116081.0A CN202310116081A CN116054543B CN 116054543 B CN116054543 B CN 116054543B CN 202310116081 A CN202310116081 A CN 202310116081A CN 116054543 B CN116054543 B CN 116054543B
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Classifications
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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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- 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0006—Arrangements for supplying an adequate voltage to the control circuit of 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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0041—Control circuits in which a clock signal is selectively enabled or disabled
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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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- 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 converter which provides multiphase current with constant inductance current ripple for a load, and comprises a charging power supply generating circuit, a plurality of on-time generators and a plurality of inductors, wherein the charging power supply generating circuit generates a first charging power supply and a second charging power supply, and the voltage of the second charging power supply is equal to the sum of the voltage of the first charging power supply and a correction voltage; the plurality of on-time generators generate a plurality of on-times in proportional relation with the first charging power supply voltage, and the plurality of on-times are used for controlling the on and off of the plurality of switching tubes; each of the plurality of inductors outputs a current with a constant inductor current ripple to the load, solving the problem of unbalanced output currents of each phase in the buck converter under the multiphase constant inductor current ripple architecture.
Description
Technical Field
The invention relates to the technical field of current control, in particular to a multiphase buck converter and a current control method.
Background
With the development of science and technology, there is an increasing demand for electronic products, and the performance requirements for electronic products are also increasing, and the switch-mode power converter is widely used in various fields, such as industry, military, commerce, consumer electronics, etc., as a "heart" of electronic products. Under conditions where the user is in high demand for battery capacity.
Ripple-based constant on-time (COT) buck converters are popular for their exceptionally fast response to load transients, inherent control simplicity and stability. Buck converters of multiphase COT architecture can solve the problem of insufficient single-phase capacity. However, in the buck converter adopting the multiphase COT architecture, it is difficult to achieve perfect matching of the on-time Ton of the switching tube between phases. The mismatch of the switching tube on-times Ton can lead to an imbalance of the output current between the phases, which in turn leads to an uneven thermal distribution, which adversely affects the performance, the power efficiency and the size of the power converter, which in turn loses the meaning of a plurality of phases.
In the prior art, there is also an applied multiphase buck converter: the step-down DC-DC converter of the multiphase constant inductance current ripple is characterized in that the conduction time Ton is adjusted by referring to the characteristics of the inductance, so that Ton is in proportional relation with the difference between the input voltage and the output voltage, and constant inductance current ripple is realized. However, in practical applications, the generation of on-time Ton in a buck converter with multiphase constant inductance current ripple often involves the calculation of an input voltage Vin and an output voltage Vout, i.e. a buck converter that converts Vin/Vout into a current proportional to the voltage, and mirrors the current to each phase, and the on-time Ton is obtained by charging/discharging the capacitance of each phase. The mirroring of multiple currents involved in this process is unavoidable, as well as the mismatch between the on-times Ton of the phases due to the current mirror mismatch.
Therefore, it is important to solve the problem of unbalanced output current of each phase in the buck converter under the multiphase constant inductance current ripple architecture.
Disclosure of Invention
The present invention is directed to a multiphase buck converter and a current control method, which solve the problem of unbalanced output current of each phase in the buck converter under the current multiphase constant inductance current ripple architecture proposed in the background art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a multiphase buck converter for providing multiphase current with constant inductor current ripple to a load, comprising:
the charging power supply generation circuit is used for generating a charging power supply and comprises a first charging power supply and a second charging power supply, and the voltage of the second charging power supply is equal to the sum of the voltage of the first charging power supply and the correction voltage;
a plurality of on-time generators connected to the charging power supply generation circuit, the charging power supply generation circuit supplying a second charging power supply to the plurality of on-time generators, each configured to generate a plurality of on-times in proportional relation to the first charging power supply voltage, the plurality of on-times for controlling the on and off of a plurality of switching tubes,
the system further comprises a plurality of inductors, wherein each inductor outputs current with constant inductance current ripple to a load under the control of the plurality of switching tubes.
Preferably, the charging power supply generation circuit includes:
a first amplifier having a forward input and a reverse input coupled to an input voltage and an output voltage, respectively, configured to generate the first charging supply voltage in a proportional relationship with a difference between the input voltage and the output voltage;
a superimposing circuit configured to generate a combined voltage related to the first charging power supply voltage and the correction voltage; and
and a second amplifier configured to amplify the combined voltage by two times, generating the second charging power supply voltage.
Preferably, each of the plurality of on-time generators includes:
a second charging power supply voltage;
the filter element filters the second charging power supply voltage and is configured to integrate the second charging power supply voltage to generate a slope voltage; and
a comparator for comparing the ramp voltage with a threshold value and outputting an indication level, the indication level being a high level when the ramp voltage is higher than the threshold value and being a low level when the ramp voltage is lower than the threshold value; and
and a latch, wherein the latch reset terminal receives the indication level, and when the indication level is high, the latch stops generating the on time, wherein the threshold value is positively related to the correction voltage.
Preferably, the threshold value refers to a preset voltage across the timing capacitor equal to twice the correction voltage.
A current control method for providing a load with multiphase current having constant inductor current ripple using a multiphase buck converter according to any of claims 1 to 4, the method comprising:
s1, a charging power supply generating circuit generates a first charging power supply and a second charging power supply, wherein the voltage of the second charging power supply is equal to the sum of the voltage of the first charging power supply and the correction voltage;
s2, generating a plurality of conduction times in proportional relation with the first charging power supply voltage by a plurality of conduction time generators, wherein the plurality of conduction times are used for controlling the conduction and the closing of a plurality of switching tubes;
and S3, outputting the current with constant inductance current ripple to a load by each of the plurality of inductors.
As a preferred embodiment, a first amplifier in the charging power supply generation circuit generates the first charging power supply voltage in a proportional relationship with a difference between an input voltage and an output voltage;
a superimposing circuit generating a combined voltage related to the first charging power supply voltage and the correction voltage; and
a second amplifier amplifies the combined voltage by a factor of two, producing the second charging supply voltage.
As a preferable technical scheme, the timing capacitor performs integration on the second charging power supply voltage to generate a slope voltage;
the comparator compares the slope voltage with a threshold value and outputs an indication level, wherein the indication level is high when the slope voltage is higher than the threshold value, and is low when the slope voltage is lower than the threshold value; and
and a latch, wherein a reset end of the latch receives the indication level, and when the indication level is high, the latch stops generating the on time, wherein the threshold value is positively related to the correction voltage.
As a preferred solution, the threshold value refers to a preset voltage across the timing capacitor, equal to twice the correction voltage.
Compared with the prior art, the invention has the beneficial effects that:
when the problem of unbalanced output current of each phase in the buck converter under the multiphase constant inductance current ripple architecture is solved, current generation proportional to Vin/Vout and multiple current mirror images caused by the current generation are not involved, and Vin and Vout are directly operated to generate a charging voltage shared by each phase, so that Ton mismatch among the phases can be effectively reduced.
Drawings
FIG. 1 is a circuit diagram of a prior art buck converter for generating a switching tube on time;
FIG. 2 is a graph I of a relationship between a switching time of a switching tube and a corrected charging power supply according to an embodiment of the present invention;
FIG. 3 is a graph II showing the relationship between the on-time of the switching tube and the corrected charging power supply according to the embodiment of the present invention;
FIG. 4 is a graph III showing the relationship between the on-time of a switching tube and a modified charging power supply according to an embodiment of the present invention;
FIG. 5 is a circuit diagram illustrating the generation of a charging power supply required to generate high precision switching tube on time according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a controller according to an embodiment of the invention;
fig. 7 is a circuit diagram of a multiphase buck converter according to an embodiment of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Fig. 1 is a circuit diagram 100 of a switching tube on-time generated by a constant frequency buck converter according to the prior art. As shown in fig. 1, the constant frequency buck converter 100 includes: the on-time generator 110, a drive, an inductance L, a high-side switch HS, and a low-side switch LS, wherein the on-time generator 110 comprises: a resistor 101, a capacitor 102, a first comparator COM1, a second comparator COM2, an SR latch 103, an inverter 104, and a switching transistor Q1. As shown in fig. 1, a charging voltage Vin is coupled to a resistor 101 to provide a supply voltage to the on-time generator 100. The first comparator COM1 compares Vset with Vout and connects the output terminal to the S port of the SR latch 103, with the forward input terminal of the first comparator COM1 being the preset output voltage Vset of the buck converter and the reverse input terminal being the actual output voltage Vout of the multiphase buck converter. The positive input terminal of the second comparator COM2 is connected to the capacitor 102, the negative input terminal is connected to Vtset, which is a preset charging voltage of the capacitor 102, and the second comparator COM2 compares the voltage Vc across the capacitor 102 with Vtset, and connects the output terminal to the R port of the SR latch. The output Q of the SR latch is connected to the input of the inverter 104, and the output signal of the inverter 104 controls the gate of the switching tube Q1, that is, controls the on and off of the switching tube Q1, and at this time, the output of the SR latch is called a pulse width modulation signal (PWM) or a turn-on time Ton.
Based on the idea of generating on-time based on a constant frequency buck converter, the present invention aims to make on-time Ton inversely proportional to the difference between the input voltage Vin and the output voltage Vout, based on the aim of achieving a constant ripple current such that the ripple on the inductor L in fig. 1 is constant. Based on this, the inventive introduction of a charging power supply Vchg replaces the input voltage Vin in fig. 1 that charges the capacitor C, where Vchg satisfies the following formula:
vchg=k1× (Vin-Vout) … … (1), where K1 is a preset coefficient.
Referring to fig. 1, after replacing the input charging voltage Vin with the input charging power supply Vchg, the on-time Ton of the buck converter, that is, the PWM signal generated by the SR latch 103, satisfies the following formula:
where R is the resistance of the resistor 101, C is the capacitance of the capacitor 102, the charging power Vchg is the voltage provided to the on-time generator 110, and Vtset is the preset charging voltage of the capacitor 102. From equation (2), it can be known that the on-time Ton is exponentially related to the charging power supply Vchg. According to an embodiment of the present invention, in order to satisfy the condition of the buck converter constant inductance current ripple, it is necessary to make the on-time Ton inversely proportional to the charging power supply Vchg, that is, to make Ton satisfy the following condition:
according to an embodiment of the present invention, equation (2) is subjected to taylor expansion as follows:
looking at equation (4), the on-time Ton does not satisfy the inverse proportion to the charging power supply Vchg. The formula closest to formula (4) and satisfying Ton in inverse proportion to Vchg is:
as shown in equation (5), ton satisfies the condition inversely proportional to Vchg, and the result of equation (4) is greater than the result of equation (5) by comparing Ton calculated by equation (4) with the result calculated by ideal equation (5). Based on the above, the invention considers that the charging power supply Vchg is corrected and then is fitted with the ideal formula (5), so as to find the curve relation close to the ideal formula (5), and further find the optimal charging power supply Vchg, thereby leading the currents of each phase in the multi-phase buck converter to be more balanced and leading the ripple of the inductance current to be minimum.
Specifically, the original charging power supply Vchg is corrected, and the values of Vtset are superimposed proportionally, namely, according to the following formula:
Vrchg＝Vchg+m*Vtset……(6)
in this embodiment, the values of m are modified by four proportional relationships, namely 1/4, 1/2, 3/4 and 1, and those skilled in the art will understand that the selected proportion is not a limitation of the present invention. The present invention intends to protect the method of obtaining the optimal on-time Ton by correcting the charging power source, and thus the above-mentioned numerical value selected for correction proportion is not a limitation of the present invention.
Fig. 2 to 4 are graphs showing the on-time Ton as a function of the corrected charging power supply Vchg according to the embodiment of the present invention. Specifically, as shown in fig. 2, 3 and 4, vtset values of 0.2V, 0.5V and 0.8V are substituted into formula (6), where Vtset ranges from 0V to 1V, and the values of Vtset are merely for better explaining the present invention and are not limiting. And respectively taking the charging power supply Vchg subjected to different proportion correction as charging voltage to supply power for the buck converter, fitting the conduction time Ton generated by the buck converter with an ideal formula (5), and finding out a relation curve closest to the ideal formula (5). The description is given by fig. 2, where vtset=0.2v, and the curves from right to left in fig. 2 are sequentially referred to as curve 1, curve 2, curve 3, curve 4, curve 5, and curve 6, which correspond to the formulas from top to bottom in fig. 2 (RC is a constant, and does not affect the fitting result), respectively, that is, the following six groups of formulas:
as shown in fig. 2, when m=1/2, the function curve of Ton and Vchg is closer to the linear proportional relationship in the ideal condition, that is, vrchg=vchg+1/2×vtset, the value of the switch on-time Ton satisfies the following formula:
similarly, when vtset=0.5v and vtset=0.8v are taken, that is, when m=1/2 is shown in fig. 3 and 4, ton and Vchg are more in a linear proportional relationship, in other words, the overlap ratio of the curve 3 and the ideal curve 4 is higher.
In summary, according to the embodiment of the present invention, when the charging power Vchg is corrected, the superimposed Vtset of 1/2 times is used as the charging power to supply power to the on-time generator 110, so as to charge the capacitor 102, where the superimposed Vtset of 1/2 times is called the correction voltage. In this case, the switch on time Ton of the buck converter satisfies the target of being inversely proportional to the charging power supply Vchg.
Fig. 5 shows a charging power supply generation circuit 120 for generating a charging power supply Vrchg required for a high-precision switching tube on time Ton according to an embodiment of the present invention. As shown in fig. 5, the charging power supply generation circuit 120 includes: a first amplifier OPA1, a second amplifier OPA2 and a third amplifier OPA3. Specifically, the input voltage Vin is connected to the positive input terminal of the first amplifier OPA1 through the resistor R1, the preset output voltage Vset is connected to the negative input terminal of the first amplifier OPA1 through the resistor R1, the output of the first amplifier OPA1 is Vchg, and the voltage Vchg of the node 1 in fig. 3 is as follows:
the second amplifier OPA2 has a positive input of Vtset and a negative input connected to the output of the second amplifier OPA2, as shown in fig. 5, the voltage at node 2 being Vtset. The output end of the second amplifier OPA2 is connected with a resistor R4, wherein the resistance value of R4 is set to be twice as high as that of the resistor R3, the resistor R3 is connected between the node 1 and the node 3, the resistor R4 is connected between the node 2 and the node 3, and then the voltage of the node 3 is calculated as follows:
V3＝1/2*Vchg+1/4*Vtset……(9)
the voltage at the positive input end of the third amplifier OPA3 is V3, and after twice amplification, the output end of the third amplifier OPA3 is the corrected charging power supply Vrchg, namely the voltage at the node 4, and the following values are calculated:
Vrchg＝Vchg+1/2*Vtset……(10)
the charging voltage Vin in fig. 1 is replaced by the corrected charging power Vrchg, so that the switch on time Ton of the buck converter and the charging power Vchg conform to a linear proportional relationship, i.e. are inversely proportional.
Fig. 6 is a circuit diagram of the controller 130 according to an embodiment of the present invention. As shown in fig. 6, the controller 130 includes: there are an on-time generator 110 and a charging power supply generation circuit 120. The circuit structures of the on-time generator 110 and the charging power generation circuit 120 are respectively referred to in fig. 1 and 5, and will not be described again here. The on-time Ton of the switch generated by the controller 130 of the present invention can be inversely proportional to the charging power Vchg, and since the charging power Vchg is directly proportional to the difference between the input voltage Vin and the output voltage Vout, it can be known that Ton is inversely proportional to the difference between the input voltage Vin and the output voltage Vout. Substituting the above formula (1) and formula (8) into formula (7) yields:
fig. 7 is a schematic diagram of a multiphase buck converter according to an embodiment of the invention. The circuit structures and circuit elements of the 1 st, 2 nd, … … nd and nth phases are identical, and the first, second and nth on-time generators … … and … … are identical to the circuits and structures of the on-time generator 110 disclosed in fig. 6. To avoid redundancy, phase 1 will be selected for illustration. As shown in fig. 7, the first phase buck converter includes: a first on-time generator, a drive, a high side switch HS, a low side switch LS and an inductance L1. The first on-time generator generates on-time Ton1, and after being driven, the first on-time generator drives the gates connected to the high-side switch HS and the low-side switch LS, and is used for controlling the on-off of the high-side switch HS or the low-side switch LS, the inductor L1 is connected with the source electrode of the high-side switch HS, the source electrode of the high-side switch HS is connected with the drain electrode of the low-side switch LS, and the source electrode of the low-side switch LS is grounded. According to the embodiment of the invention, when the on-time Ton1 is at a high level, the high-side switch HS is turned on, the input voltage Vin charges the inductor L1, whereas when the on-time Ton1 is at a low level, the low-side switch LS is turned on, and the inductor L1 is discharged. From this, it can be calculated that the ripple current Δi1 on the inductance L1 satisfies the following formula:
wherein R is the resistance of the resistor 101 in fig. 1, C is the capacitance of the capacitor 102 in fig. 1, R1 and R2 are the resistances of the resistor R1 and the resistor R2 in fig. 3, and L1 is the inductance of the inductor L1 in the first-phase buck converter in fig. 7. As can be seen from the above formula (12), the current ripple Δi1 on the inductor L1 in the first phase buck converter is a constant value, and the current ripple Δi1 on the inductor L1 can be made to reach a lower level by adjusting the values of the above inductor, capacitor and resistor. The current ripple on the inductor in the second phase and the third phase … … N-th phase buck converter is constant, and the current ripple cannot change along with the change of the input voltage Vin and the output voltage Vout and cannot change along with the change of the load. Therefore, through the embodiment disclosed by the invention, multiphase constant inductance current ripple is realized, and then the current balance in the buck converter of each phase is realized.
By the embodiments disclosed herein, the problem of unbalance between currents in all phases in a multi-phase buck converter is solved. Taking the physical characteristics of the inductor into consideration, the charging power supply Vchg is creatively introduced, the on time Ton of the switching tube is inversely proportional to the difference between the input voltage Vin and the output voltage Vout, and the output current is equally shared among the buck converters of each phase. The invention discloses a method and a device for balancing phase currents in a multiphase buck converter, which solve the problems of insufficient capacity of a single-phase buck converter and unbalanced currents of each phase between multiphase converters. The multiphase buck converter disclosed by the invention has a simple structure, does not influence the size of a chip, improves the efficiency, and simultaneously greatly saves the area of the chip.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A multiphase buck converter for providing multiphase current to a load having constant inductor current ripple, comprising:
the charging power supply generation circuit is used for generating a charging power supply and comprises a first charging power supply and a second charging power supply, and the voltage of the second charging power supply is equal to the sum of the voltage of the first charging power supply and the correction voltage;
the charging power supply generation circuit includes:
a first amplifier having a forward input and a reverse input coupled to an input voltage and an output voltage, respectively, configured to generate the first charging supply voltage in a proportional relationship with a difference between the input voltage and the output voltage;
a superimposing circuit configured to generate a combined voltage related to the first charging power supply voltage and the correction voltage; and
a second amplifier configured to amplify the combined voltage by two times, generating the second charging power supply voltage;
a plurality of on-time generators connected to the charging power supply generation circuit, the charging power supply generation circuit supplying a second charging power supply to the plurality of on-time generators, each configured to generate a plurality of on-times in proportional relation to the first charging power supply voltage, the plurality of on-times for controlling the on and off of a plurality of switching tubes,
the system further comprises a plurality of inductors, wherein each inductor outputs current with constant inductance current ripple to a load under the control of the plurality of switching tubes.
2. The multiphase buck converter according to claim 1, wherein each of the plurality of on-time generators includes:
a second charging power supply voltage;
the filter element filters the second charging power supply voltage and is configured to integrate the second charging power supply voltage to generate a slope voltage; and
a comparator for comparing the ramp voltage with a threshold value and outputting an indication level, the indication level being a high level when the ramp voltage is higher than the threshold value and being a low level when the ramp voltage is lower than the threshold value; and
and a latch, wherein the latch reset terminal receives the indication level, and when the indication level is high, the latch stops generating the on time, wherein the threshold value is positively related to the correction voltage.
3. A multiphase buck converter according to claim 2, wherein the predetermined voltage across the threshold-time capacitor is equal to twice the correction voltage.
4. A current control method for providing a load with multiphase current having constant inductor current ripple using a multiphase buck converter according to any of claims 1 to 3, the method comprising:
s1, a charging power supply generating circuit generates a first charging power supply and a second charging power supply, wherein the voltage of the second charging power supply is equal to the sum of the voltage of the first charging power supply and the correction voltage; a first amplifier in the charging power supply generation circuit generates the first charging power supply voltage in a proportional relationship with a difference between an input voltage and an output voltage; a superimposing circuit generating a combined voltage related to the first charging power supply voltage and the correction voltage; and a second amplifier that amplifies the combined voltage by a factor of two, producing the second charging supply voltage;
s2, generating a plurality of conduction times in proportional relation with the first charging power supply voltage by a plurality of conduction time generators, wherein the plurality of conduction times are used for controlling the conduction and the closing of a plurality of switching tubes;
and S3, outputting the current with constant inductance current ripple to a load by each of the plurality of inductors.
5. The method of claim 4, wherein a timing capacitor integrates the second charging supply voltage to generate a ramp voltage;
the comparator compares the slope voltage with a threshold value and outputs an indication level, wherein the indication level is high when the slope voltage is higher than the threshold value, and is low when the slope voltage is lower than the threshold value; and
and a latch, wherein a reset end of the latch receives the indication level, and when the indication level is high, the latch stops generating the on time, wherein the threshold value is positively related to the correction voltage.
6. A current control method according to claim 5, wherein the threshold value refers to a preset voltage across the timing capacitor, which is equal to twice the correction voltage.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3468022A1 (en) * | 2017-10-04 | 2019-04-10 | Nxp B.V. | Switch-mode power converter |
| CN111727553A (en) * | 2018-02-19 | 2020-09-29 | 微芯片技术股份有限公司 | Method and apparatus for phase current balancing in a multi-phase constant on-time buck converter |
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| EP3468022A1 (en) * | 2017-10-04 | 2019-04-10 | Nxp B.V. | Switch-mode power converter |
| CN111727553A (en) * | 2018-02-19 | 2020-09-29 | 微芯片技术股份有限公司 | Method and apparatus for phase current balancing in a multi-phase constant on-time buck converter |
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