阅读说明：本技术 一种多相交错并联型dc-dc变换器输出电流控制方法及其系统 (Output current control method and system for multiphase interleaving parallel DC-DC converter ) 是由 姚为正 王瑞 赵建荣 黄辉 王林 陈枫 唐启迪 魏亚龙 杜智亮 龚培娇 程兴邦 于 2021-02-26 设计创作，主要内容包括：本发明公开了一种多相交错并联型DC-DC变换器输出电流控制方法及其系统,方法包括：中断频率f-i＝N×f-s,f-s为开关频率；脉宽调制寄存器PWM的三角载波频率设置为f-s,计数方式采用增减计数,三角载波相位依次滞后360°/N。S1,触发中断时,读取N相桥臂电流信息,其中第S个桥臂的电流恰好为平均值电流,计算第S相桥臂功率开关管的占空比；S2,将占空比转换为PWM信号；S3,用生成的PWM信号驱动第S相桥臂的功率开关管。系统包括：计算模块、数字控制模块和驱动模块,用于生成PWM信号并依次驱动N相桥臂的功率开关管。本发明能够解决多相交错并联DC-DC变换器因电流纹波较大导致的电流控制效果不佳的问题,同时可以实现各相之间的良好均流,提高电流控制精度。(The invention discloses a multiphase interleaving parallel type DC-DC converter output current control method and a system thereof, wherein the method comprises the following steps: frequency of interruption f i ＝N×f s ，f s Is the switching frequency; triangular carrier frequency setting f of pulse width modulation register PWM s The counting mode adopts the counting of increase and decrease, and the phase of the triangular carrier wave lags behind by 360 degrees/N in sequence. S1, reading N-phase bridge arm current information when triggering interruption occurs, wherein the current of the S-th bridge arm is just the average current, and calculating the duty ratio of the power switching tube of the S-th bridge arm; s2, converting the duty ratio into a PWM signal; and S3, driving the power switch tube of the S-phase bridge arm by the generated PWM signal. The system comprises: and the calculation module, the digital control module and the driving module are used for generating PWM signals and sequentially driving the power switching tubes of the N-phase bridge arms. The invention can solve the problem that the current control effect of the multiphase interleaving parallel DC-DC converter is not good due to large current rippleThe current sharing among all phases can be realized, and the current control precision is improved.)

1. A method for controlling an output current of a multiphase interleaved parallel DC-DC converter is characterized by comprising the following steps:

s1, collecting currents of N bridge arms when interruption is triggered, wherein the current of the S bridge arm is just the average current, only updating the duty ratio information of the power tube of the S bridge arm through a control algorithm, adopting underflow interruption when the number N of the bridge arms is an even number, and adopting cycle interruption when the number N of the bridge arms is an odd number;

s2, converting the duty ratio into a PWM signal;

and S3, driving the power switch tube of the S-phase bridge arm by the generated PWM signal.

2. The multiphase interleaved parallel type DC-DC converter output current control method according to claim 1, wherein the interruption frequency f_i＝N×f_sWherein f is_sIs the switching frequency.

3. The multiphase interleaved parallel type DC-DC converter output current control method according to claim 2,

triangular carrier frequency setting f of pulse width modulation module PWM_sThe counting mode adopts the counting of increase and decrease, and the phase of the triangular carrier wave lags behind by 360 degrees/N in sequence.

4. The method for controlling the output current of the multiphase interleaved parallel DC-DC converter according to claim 2, wherein when the number N of the bridge arms is odd, the periodic interruption is adopted, and the method comprises the following steps:

when the number N of bridge arms is odd, in the 1 st bridge armObtaining output current i of N-phase bridge arm when triggering is interrupted_nN is 1, 2.. times.n, where the S-th bridge arm current i_sThe average value is S ═ 2+ (N-1)/2, S is more than 1 and less than N, and the duty ratio of the S-th phase bridge arm power switching tube is updated;

and carrying out periodic triggering in the r-th sampling period, and sequentially updating the duty ratios of S +1, S +2, …, N,1,2, … and S-1 phase bridge arm switching tubes, wherein r is 2,3 and … N.

5. The method for controlling the output current of the multiphase interleaved parallel DC-DC converter according to claim 2, wherein when the number N of the bridge arms is even, the underflow interrupt is adopted, and the method comprises the following steps:

when the number N of the bridge arms is even, the output current i of the N-phase bridge arm is obtained when the 1 st interruption is triggered_nN is 1,2,.., N, wherein S is^*Phase leg current i_s*Is an average point, S^*＝2+N/2，1＜S^*< N, update the S^*Duty ratio of the phase bridge arm power switching tube;

at the r th^*Underflow triggering is carried out in one sampling period, and S is obtained in sequence^*+1,S^*+2,…,N,1,2,…,S^*-1 phase bridge arm switching tube PWM signal, r^*2,3, … N, wherein r^*＝2,3,…N。

6. An output current control system of a multiphase interleaved parallel type DC-DC converter, comprising:

the calculation module is used for collecting currents of N bridge arms when the interruption is triggered, wherein the current of the S-th bridge arm is just the average current, only the duty ratio information of the power tube of the S-th bridge arm is updated through a control algorithm, when the number N of the bridge arms is an even number, underflow interruption is adopted, and when the number N of the bridge arms is an odd number, periodic interruption is adopted;

the digital control module is used for converting the duty ratio into a PWM signal;

and the driving module is used for generating PWM signals and sequentially driving the power switching tubes of the N-phase bridge arms.

7. Multi-phaseAn output current control system of an interleaved parallel DC-DC converter, characterized in that the interrupt frequency f of the system_i＝N×f_sWherein f is_sIs the switching frequency.

8. The multiphase interleaved parallel DC-DC converter output current control system according to claim 7 further comprising a Pulse Width Modulation (PWM) module having a triangular carrier frequency set to f_sThe counting mode adopts the counting of increase and decrease, and the phase of the triangular carrier wave lags behind by 360 degrees/N in sequence.

9. The multiphase interleaved parallel DC-DC converter output current control system according to claim 7 wherein said calculation module comprises:

an underflow interrupt unit for obtaining the output current i of the N-phase bridge arm when the 1 st interrupt is triggered when the number N of the bridge arms is even_nN is 1,2,.., N, wherein S is^*Phase leg current i_s*Is an average point, S^*＝2+N/2，1＜S^*< N, update the S^*Duty ratio of the phase bridge arm power switching tube; at the r th^*Underflow triggering is carried out in one sampling period, and S is obtained in sequence^*+1,S^*+2,…,N,1,2,…,S^*-1 phase bridge arm switching tube PWM signal, r^*2,3, … N, wherein r^*＝2,3,…N；

A period interruption unit for obtaining the output current i of the N-phase bridge arm when the 1 st interruption is triggered when the number N of the bridge arms is odd_nN is 1, 2.. times.n, where the S-th bridge arm current i_sThe average value is S ═ 2+ (N-1)/2, S is more than 1 and less than N, and the duty ratio of the S-th phase bridge arm power switching tube is updated; and carrying out periodic triggering in the r-th sampling period, and sequentially updating the duty ratios of S +1, S +2, …, N,1,2, … and S-1 phase bridge arm switching tubes, wherein r is 2,3 and … N.

Technical Field

The invention relates to the technical field of current control, in particular to a method and a system for controlling output current of a multiphase interleaving parallel DC-DC converter.

Background

The interleaved parallel DC-DC converter is widely used due to its advantages of small size, low cost, high efficiency, etc. The key to the implementation of the circuit topology is two points: firstly, solve the problem of flow equalizing between two phases, secondly the not good problem of output current control effect.

In order to solve the problems, various control schemes are proposed in different documents to improve the performance of the DC-DC converter, and all the control schemes need to sample the output current of the DC-DC converter as feedback to participate in operation, so that the sampling and control mode of the output current is crucial to the control effect of the DC-DC converter system.

In a conventional current sampling mode, each phase of bridge arm current is sampled at the same time by configuring a sampling trigger condition, and a current sampling value is used as feedback to perform control operation. The current values of the bridge arms of the phases obtained in the mode are random, so that the current loop control output effect of the bridge arms of the phases is unstable, and the current equalizing effect and the output current control effect of the phases of the DC-DC converter are influenced. For better describing the phenomenon, the control method shown in fig. 3 is adopted by taking the topology of the interleaved parallel three-phase DC-DC converter shown in fig. 2 as an example to obtain the corresponding relationship between the triangular carrier and the current in the conventional current sampling mode shown in fig. 4.

Most of the current control schemes use average current to calculate, and the average current is usually obtained by two ways: the first method is to calculate the average value by collecting the current value in a period of time and use the average value for system control, for example, chinese patent publication No. CN110474554A, by which the average value of the current can be obtained, but the control effect is not accurate enough. The second is to design a current average sampling circuit to obtain the current average, as disclosed in chinese patent No. CN108513400B, and the implementation of current average sampling in this way will increase the hardware cost and complexity of the hardware circuit.

Disclosure of Invention

In view of this, an object of the embodiments of the present invention is to provide a method and a system for controlling an output current of a multiphase interleaving parallel DC-DC converter, which can solve the problem of poor current control effect of the multiphase interleaving parallel DC-DC converter due to large current ripple, and can achieve good current sharing among phases and improve current control accuracy.

In a first aspect, an embodiment of the present invention provides a method for controlling an output current of a multiphase interleaved parallel DC-DC converter, including:

and S1, acquiring the currents of the N bridge arms when the interruption is triggered, wherein the current of the S bridge arm is just the average current, and only updating the duty ratio information of the power tube of the S bridge arm through a control algorithm in the interruption. And when the number N of the bridge arms is an even number, adopting underflow interruption, and when the number N of the bridge arms is an odd number, adopting cycle interruption.

S2, the digital system converts the duty cycle into a PWM signal.

And S3, driving the power switch tube of the S-phase bridge arm by the generated PWM signal.

Wherein the current is in a positive direction toward the low voltage side.

With reference to the first aspect, an embodiment of the present invention provides a first possible implementation manner of the first aspect, where the frequency f of the interruption is set to be lower than the first frequency_i＝N×f_sWherein f is_sIs the switching frequency.

With reference to the first aspect, an embodiment of the present invention provides a second possible implementation manner of the first aspect, wherein a triangular carrier frequency of the pulse width modulation module PWM is set to f_sThe counting mode adopts the counting of increase and decrease, and the phase of the triangular carrier wave lags behind by 360 degrees/N in sequence.

With reference to the first aspect, an embodiment of the present invention provides a third possible implementation manner of the first aspect, where when the number N of bridge arms is an odd number, the applying a periodic interrupt includes:

when the number N of the bridge arms is odd, the output current i of the N-phase bridge arm is obtained when the 1 st interruption is triggered_nN is 1, 2.. times.n, where the S-th bridge arm current i_sAnd updating the duty ratio of the power switching tube of the S-th phase bridge arm as an average value point, wherein S is 2+ (N-1)/2, and S is more than 1 and less than N.

And carrying out periodic triggering in the r-th sampling period, and sequentially updating the duty ratios of S +1, S +2, …, N,1,2, … and S-1 phase bridge arm switching tubes, wherein r is 2,3 and … N.

With reference to the first aspect, an embodiment of the present invention provides a fourth possible implementation manner of the first aspect, where, when the number N of bridge arms is an even number, the using underflow interrupt includes:

when the number N of the bridge arms is even, the output current of the N-phase bridge arm is obtained when the 1 st interruption is triggered，i_nN is 1,2,.., N, wherein S is^*Phase leg current i_s*Is an average point, S^*＝2+N/2，1＜S^*< N, update the S^*And the duty ratio of the phase bridge arm power switch tube.

At the r th^*Underflow triggering is carried out in one sampling period, and S is obtained in sequence^*+1,S^*+2,…,N,1,2,…,S^*-1 phase bridge arm switching tube PWM signal, r^*2,3, … N, wherein r^*＝2,3,…N。

In a second aspect, an embodiment of the present invention further provides a system for controlling an output current of a multiphase interleaved parallel DC-DC converter, including:

and the calculation module is used for acquiring the currents of N bridge arms when the interruption is triggered, wherein the current of the S-th bridge arm is just the average current, the interruption only updates the duty ratio information of the power tube of the S-th bridge arm through a control algorithm, the underflow interruption is adopted when the number N of the bridge arms is an even number, and the cycle interruption is adopted when the number N of the bridge arms is an odd number.

And the digital control module is used for converting the duty ratio into a PWM signal.

And the driving module is used for generating PWM signals and sequentially driving the power switching tubes of the N-phase bridge arms.

With reference to the second aspect, embodiments of the present invention provide a first possible implementation manner of the second aspect, wherein the interrupt frequency f of the system_i＝N×f_sWherein f is_sIs the switching frequency.

With reference to the second aspect, the embodiment of the present invention provides a second possible implementation manner of the second aspect, where the second possible implementation manner further includes a pulse width modulation module PWM, and a triangle carrier frequency of the pulse width modulation module PWM is set to f_sThe counting mode adopts the counting of increase and decrease, and the phase of the triangular carrier wave lags behind by 360 degrees/N in sequence.

With reference to the second aspect, an embodiment of the present invention provides a third possible implementation manner of the second aspect, where the calculating module includes:

an underflow interrupt unit for obtaining the output current i of the N-phase bridge arm when the 1 st interrupt is triggered when the number N of the bridge arms is even_nN is 1,2,.., N, wherein S is^*Phase leg current i_s*Is an average point, S^*＝2+N/2，1＜S^*< N, update the S^*Duty ratio of the phase bridge arm power switching tube; at the r th^*Underflow triggering is carried out in one sampling period, and S is obtained in sequence^*+1,S^*+2,…,N,1,2,…,S^*-1 phase bridge arm switching tube PWM signal, r^*2,3, … N, wherein r^*＝2,3,…N；

A period interruption unit for obtaining the output current i of the N-phase bridge arm when the 1 st interruption is triggered when the number N of the bridge arms is odd_nN is 1, 2.. times.n, where the S-th bridge arm current i_sThe average value is S ═ 2+ (N-1)/2, S is more than 1 and less than N, and the duty ratio of the S-th phase bridge arm power switching tube is updated; and carrying out periodic triggering in the r-th sampling period, and sequentially updating the duty ratios of S +1, S +2, …, N,1,2, … and S-1 phase bridge arm switching tubes, wherein r is 2,3 and … N.

The embodiment of the invention has the beneficial effects that:

the invention provides a method and a system for controlling output current of a multiphase interleaving parallel DC-DC converter, which are used for repeatedly and sequentially calculating the duty ratio of each phase of bridge arm to obtain a PWM signal so as to control the output current, realize the stable operation of the interleaving parallel DC-DC converter, solve the problem of poor current control effect of the multiphase interleaving parallel DC-DC converter caused by large current ripples, realize good current sharing among phases and improve the current control precision.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a flow chart of a method for controlling an output current of a multiphase interleaved parallel DC-DC converter according to the present invention;

FIG. 2 is a prior art interleaved parallel three-phase DC-DC converter topology structure;

FIG. 3 is a block diagram of a conventional control of a prior art DC-DC converter;

FIG. 4 is a diagram showing a correspondence between carrier and current sampling in a conventional current sampling manner;

FIG. 5 is a schematic diagram illustrating a current average value sampling principle of the method for controlling the output current of the multiphase interleaved parallel DC-DC converter according to the present invention;

fig. 6 is a schematic diagram of the output current control method of the multiphase interleaved parallel DC-DC converter according to the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein can be arranged and designed in a wide variety of different configurations.

Referring to fig. 1 to 2 and 5 to 6, a first embodiment of the present invention provides a method for controlling an output current of a multiphase interleaved parallel DC-DC converter, including:

and S1, collecting the currents of N bridge arms when the interruption is triggered, wherein the current of the S bridge arm is just the average current, only updating the duty ratio information of the power tube of the S bridge arm through a control algorithm in the interruption, adopting underflow interruption when the number N of the bridge arms is an even number, and adopting periodic interruption when the number N of the bridge arms is an odd number.

S2, the digital system converts the duty cycle into a PWM signal.

And S3, driving the power switch tube of the S-phase bridge arm by the generated PWM signal.

Wherein the current is in a positive direction toward the low voltage side.

Wherein the frequency of interruption f_i＝N×f_sWherein f is_sIs the switching frequency.

Wherein, the triangular carrier frequency of the PWM module is set as f_sThe counting mode adopts the counting of increase and decrease, and the phase of the triangular carrier wave lags behind by 360 degrees/N in sequence.

Wherein, when bridge arm number N is the odd number, adopt cycle interrupt, include:

when the number N of the bridge arms is odd, the output current i of the N-phase bridge arm is obtained when the 1 st interruption is triggered_nN is 1, 2.. times.n, where the S-th bridge arm current i_sAnd updating the duty ratio of the power switching tube of the S-th phase bridge arm as an average value point, wherein S is 2+ (N-1)/2, and S is more than 1 and less than N.

And carrying out periodic triggering in the r-th sampling period, and sequentially updating the duty ratios of S +1, S +2, …, N,1,2, … and S-1 phase bridge arm switching tubes, wherein r is 2,3 and … N.

Wherein, when bridge arm number N is the even number, adopt underflow interrupt, include:

when the number N of the bridge arms is even, the output current i of the N-phase bridge arm is obtained when the 1 st interruption is triggered_nN is 1,2,.., N, wherein S is^*Phase leg current i_s*Is an average point, S^*＝2+N/2，1＜S^*< N, update the S^*And the duty ratio of the phase bridge arm power switch tube.

At the r th^*Underflow triggering is carried out in one sampling period, and S is obtained in sequence^*+1,S^*+2,…,N,1,2,…,S^*-1 phase bridge arm switching tube PWM signal, r^*2,3, … N, wherein r^*＝2,3,…N。

Wherein, the three-phase interleaved parallel DC-DC topology is taken as an example (FIG. 2) to illustrate the current i_sFor the reasons of the mean value:

as shown in fig. 5, during one switching period T_sIf the current duty ratio is unchanged, the count comparison value CMP converted from the duty ratio is unchanged, i.e. WQ/FG/AC, taking the 3 rd phase triangular carrier processing as an example:

(1) when CMP < TBCTR, the PWM3 signal is low, corresponding to the low level of the VT6 PWM signal in FIG. 2, and the high level of the VT5 PWM signal; at this time, the high-voltage side voltage passes through VT5 to the low-voltage side inductor L₃Charging i₃Rising, as in segment AB of the current waveform of fig. 5.

(2) When CMP ≧ TBCTRThe PWM3 signal is high, corresponding to the VT6 signal in fig. 2 being high, the VT5 PWM signal being low; low-voltage side inductor L at the moment₃Freewheeling via VT5, i₃And falls as in segment BC of the current waveform of fig. 6.

The current i is therefore at point P in the case of a triangular carrier₃Reaches a maximum value, at point B in terms of current waveform, current i₃When the maximum value is reached, the extension line of PB and AC are intersected at D, BD ^ AC can be obtained, and the BDC of the triangle is a right-angled triangle.

Because the triangular carrier is an isosceles triangle, a DC vertical line is made at the periodic point of the 3 rd phase triangular carrier, the easily obtained intersection point E is the middle point of the DC, and the t corresponding to the E point₃Current i at time_t3Calculating the formula (1):

wherein Δ I ═ I_max-I_min；

In a switching period T_sAverage value of internal current I_aveCalculation formula (2)

As can be seen from the formulas (1) and (2), t corresponds to the E point₃Current i sampled at time instant_t3Is the average value of the 3 rd phase bridge arm current, namely when the period triggering is carried out at the interrupted part, i.e. corresponding to the period point of the triangular carrier wave, i in the 3 rd phase bridge arm current obtained by sampling₃And only updating the duty ratio of the 3 rd phase bridge arm power switch tube for the current average value of the 3 rd phase bridge arm through a control algorithm.

By the mode, for the multiphase staggered DC-DC converter, the current participating in control each time can be guaranteed to be the average value of the current of each bridge arm.

Referring to fig. 2 to 3 and fig. 6, a second embodiment of the present invention provides a method for controlling an output current of a multiphase interleaved parallel DC-DC converter, including:

FIG. 2 is a DC-DC converter with three-phase interleaved parallel topology, defining U_upIs a high side voltage, U_downIs a low side voltage, i_kIs the k-th phase bridge arm current, wherein k is 1,2,3, I_downThe total current at the low side is positive in the direction shown in fig. 2.

Step 1: triangular carrier frequency f configured with ePWM 1-3 modules_sThe 2 nd phase carrier and the 3 rd phase carrier are configured to lag by 120 degrees and 240 degrees in sequence by taking the 1 st phase carrier as a reference, and the counting mode is up-down counting.

Step 2: configuring ePWM4 interrupt as a periodic trigger mode with the interrupt frequency of 3f_sePWM4 and ePWM1 keep the start point in phase, and the counting mode is up-down counting.

And step 3: as shown in fig. 6, at t₁Triggering interruption at any moment, and sampling three-phase bridge arm current i₁、i₂、i₃Wherein i₃Calculating according to the control block diagram shown in FIG. 3 to obtain the duty ratio D of the 3 rd phase bridge arm power switching tube₃D is loaded at time T1₃。

And 4, step 4: will D₃The value CMP is converted into a value CMP to be compared with the triangular carrier count value TBCTR according to equation (3).

And 5: generating a PWM signal for driving a power switch tube VT6 under a 3 rd phase bridge arm as follows:

when CMP < TBCTR, PWM3 is low;

when CMP is larger than or equal to TBCTR, PWM3 is high level;

step 6: and (5) inverting the PWM3 signal obtained in the step (5) to obtain a PWM signal of the upper tube VT5 of the 3 rd phase bridge arm.

And 7: in the same way at t₂、t₃And triggering the interruption of the sampling period at any moment, and respectively obtaining PWM signals of the 1 st phase bridge arm power switching tube and the 2 nd phase bridge arm power switching tube according to the method in the steps 3-6.

And 8: and (5) repeating the process by taking the step 3 to the step 7 as a cycle to realize the stable operation of the interleaved parallel DC-DC converter.

Referring to fig. 2, 5 to 6, a third embodiment of the invention provides an output current control system of a multiphase interleaved parallel DC-DC converter, including:

and the calculation module is used for collecting the currents of N bridge arms when the interruption is triggered, wherein the current of the S-th bridge arm is just the average current, only updating the duty ratio information of the power tube of the S-th bridge arm through a control algorithm, adopting underflow interruption when the number N of the bridge arms is an even number, and adopting cycle interruption when the number N of the bridge arms is an odd number.

And the digital control module is used for converting the duty ratio into a PWM signal.

And the driving module is used for generating PWM signals and sequentially driving the power switching tubes of the N-phase bridge arms.

Wherein the frequency of interruption f of the system_i＝N×f_sWherein f is_sIs the switching frequency.

Wherein, the device also comprises a pulse width modulation module PWM, and the triangular carrier frequency of the pulse width modulation module PWM is set as f_sThe counting mode adopts the counting of increase and decrease, and the phase of the triangular carrier wave lags behind by 360 degrees/N in sequence.

Wherein the calculation module comprises:

an underflow interrupt unit for obtaining the output current i of the N-phase bridge arm when the 1 st interrupt is triggered when the number N of the bridge arms is even_nN is 1,2,.., N, wherein S is^*Phase leg current i_s*Is an average point, S^*＝2+N/2，1＜S^*< N, update the S^*Duty ratio of the phase bridge arm power switching tube; at the r th^*Underflow triggering is carried out in one sampling period, and S is obtained in sequence^*+1,S^*+2,…,N,1,2,…,S^*-1 phase bridge arm switching tube PWM signal, r^*2,3, … N, wherein r^*＝2,3,…N；

A period interruption unit for obtaining the output current i of the N-phase bridge arm when the 1 st interruption is triggered when the number N of the bridge arms is odd_nN is 1,2,.., N, wherein the S-th bridge armCurrent i_sThe average value is S ═ 2+ (N-1)/2, S is more than 1 and less than N, and the duty ratio of the S-th phase bridge arm power switching tube is updated; and carrying out periodic triggering in the r-th sampling period, and sequentially updating the duty ratios of S +1, S +2, …, N,1,2, … and S-1 phase bridge arm switching tubes, wherein r is 2,3 and … N.

The embodiment of the invention aims to protect a method and a system for controlling the output current of a multiphase interleaving parallel DC-DC converter, and the method and the system have the following effects:

according to the invention, the duty ratio of each phase of bridge arm is repeatedly and sequentially calculated to obtain the PWM signal, so that the output current is controlled, the stable operation of the staggered parallel DC-DC converter is realized, the problem of poor current control effect of the multiphase staggered parallel DC-DC converter caused by large current ripple can be solved, meanwhile, good current sharing among phases can be realized, and the current control precision is improved.

The computer program product of the method and the device for controlling the output current of the multiphase interleaved parallel DC-DC converter according to the embodiments of the present invention includes a computer readable storage medium storing a program code, where instructions included in the program code may be used to execute the method in the foregoing method embodiments, and specific implementation may refer to the method embodiments, and will not be described herein again.

Specifically, the storage medium can be a general storage medium, such as a mobile disk, a hard disk, and the like, and when a computer program on the storage medium is executed, the method for controlling the output current of the multiphase interleaving parallel DC-DC converter can be executed, so that the problem of poor current control effect of the multiphase interleaving parallel DC-DC converter due to large current ripples can be solved, good current sharing among phases can be realized, and the current control accuracy can be improved.

Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.