CN112615535A - Soft start circuit for interleaved DC converter and control method thereof - Google Patents

Soft start circuit for interleaved DC converter and control method thereof Download PDF

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Publication number
CN112615535A
CN112615535A CN202011377790.7A CN202011377790A CN112615535A CN 112615535 A CN112615535 A CN 112615535A CN 202011377790 A CN202011377790 A CN 202011377790A CN 112615535 A CN112615535 A CN 112615535A
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switch tube
power switch
auxiliary
soft
circuit
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CN112615535B (en
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李虹
杜海涛
曾洋斌
邵天骢
张波
郑琼林
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Beijing Jiaotong University
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Beijing Jiaotong University
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/36Means for starting or stopping converters
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02MAPPARATUS 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
    • H02M1/00Details of apparatus for conversion
    • H02M1/32Means for protecting converters other than automatic disconnection

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention provides a soft start circuit for an interleaved direct current converter and a control method thereof, wherein the soft start comprises the following steps: auxiliary diode DaAuxiliary switch tube SaAuxiliary resistor RaWherein the auxiliary diode DaIs connected to an external circuit, the auxiliary resistor RaIs respectively connected with an external circuit, the auxiliary switch tube SaAnd said auxiliary diode DaIs connected to the cathode of the auxiliary switching tube SaAnd the source or emitter of (2) and the auxiliary resistor RaAnd the other end of the two are connected. The control method comprises the steps of fixing step length, changing phase and duty ratio and complementing duty ratio by taking a switching period as a unit. Therefore, the starting current peak of the interleaved direct current converter is well inhibited, the power loss of the interleaved direct current converter is reduced, the soft start reliability is improved, and the interleaved direct current converter is expandedThe application prospect of (1).

Description

Soft start circuit for interleaved DC converter and control method thereof
Technical Field
The invention relates to the technical field of power electronics, in particular to a soft start circuit for an interleaved direct current converter and a control method thereof.
Background
As an interface for exchanging energy between a new energy source and an energy storage unit and an energy system, power electronic devices play an important role in the development and utilization of energy. The interleaved dc converter with low input current ripple characteristics plays an important role as an interface device for renewable energy sources and energy systems in micro-grids, renewable energy distributed power generation and other systems.
In the related technology, the staggered direct current converter has the characteristic of staggered control, the phase-shift duty ratio of a main power switch tube is always larger than 0.5, two main power switch tubes cannot be turned off simultaneously, when the staggered direct current converter works in a stable state, a loop of energy release exists in the main power inductor during the turn-off period of the main power switch tube for controlling the charging and discharging of a certain main power inductor, but when the converter is directly started, because an intermediate energy storage capacitor and an output capacitor in a boosting unit are precharged, the energy release process does not exist, the inductor current always works in an energy storage state, and the inductor current continuously rises to generate a starting current peak.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, a first objective of the present invention is to provide a soft start circuit for an interleaved dc converter, so as to achieve better suppression of the start current peak of the interleaved dc converter, reduce the power loss to the interleaved dc converter, improve the reliability of soft start, and expand the application prospect of the interleaved dc converter.
A second object of the present invention is to provide a control method for a soft start circuit of an interleaved dc converter.
A third object of the invention is to propose a computer device.
A fourth object of the invention is to propose a non-transitory computer-readable storage medium.
To achieve the above object, an embodiment of the first aspect of the present invention provides a soft-start circuit for an interleaved dc converter, including: auxiliary diode DaAuxiliary switch tube SaAuxiliary resistor RaWherein the auxiliary diode DaIs connected to an external circuit, the auxiliary resistor RaIs respectively connected with an external circuit, the auxiliary switch tube SaAnd said auxiliary diode DaIs connected to the cathode of the auxiliary switching tube SaAnd the source or emitter of (2) and the auxiliary resistor RaAnd the other end of the two are connected.
To achieve the above object, a second embodiment of the present invention provides a control method for a soft start circuit of an interleaved dc converter, including: the soft-start circuit described in the foregoing embodiment of the first aspect, the control method includes the following steps: in the process of soft starting the soft start circuit, acquiring a target power switch tube which is conducted under the current switching period; acquiring a first real-time phase-shifting duty ratio of the target power switch tube, and calculating a phase-shifting duty ratio difference value of the target phase-shifting duty ratio and the first real-time phase-shifting duty ratio; judging whether the phase-shifting duty ratio difference value is larger than 0; if the phase shift duty ratio difference is larger than 0, the auxiliary switch tube S is controlled according to the phase shift duty ratio differenceaThe second real-time phase-shifted duty cycle.
To achieve the above object, a third embodiment of the present invention provides a computer device, including: a soft start circuit, a memory, a processor and a computer program stored on the memory and executable on the processor as described above, which when executed by the processor implements the method as claimed in any one of claims 6 to 10.
In order to achieve the above object, a fourth aspect of the present invention provides a non-transitory computer-readable storage medium, on which a computer program is stored, the computer program, when executed by a processor, implementing the method according to the above embodiment.
The embodiment provided by the invention at least comprises the following beneficial technical effects:
the soft start branch of the external circuit is provided, the degree of freedom of the duty ratio step length under the control method in the soft start process is high, the soft start branch can be automatically adjusted according to the actual situation, the soft start circuit is safe and reliable, the soft start circuit only works in the soft start process, and the soft start circuit assists the diode DaAuxiliary switch tube SaAnd an auxiliary resistor RaThe power loss generated in a short time is small, the loss of a main power loop caused by contact resistance after the soft start of the relay switch resistor is avoided, the number of components used by a soft start circuit is small, the circuit structure is simple, the whole technical scheme of the soft start is easy to realize, and the soft start circuit has a good inhibition effect on the starting current spike of the staggered direct current converter.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a soft start circuit for an interleaved dc converter according to an embodiment of the present invention;
FIG. 2 is a flow chart of a control method for a soft start circuit of an interleaved DC converter according to one embodiment of the present invention;
FIG. 3 is an equivalent circuit diagram of a soft start circuit for an interleaved DC converter and a control method thereof according to an operating mode I of the present invention;
FIG. 4 is an equivalent circuit diagram of a soft start circuit for an interleaved DC converter and a control method thereof according to working mode II of the present invention;
FIG. 5 is an equivalent circuit diagram of a soft start circuit for an interleaved DC converter and a control method thereof according to an operation mode III of the present invention;
FIG. 6 shows driving waveforms of a soft start circuit for an interleaved DC converter and a control method thereof according to the present invention;
FIG. 7 is a flow chart of a control method for a soft start circuit of an interleaved DC converter according to another embodiment of the present invention;
FIG. 8 is a simulated waveform diagram of the start current and the output voltage of a soft start circuit for an interleaved DC converter and a control method thereof according to the present invention;
FIG. 9 is a waveform diagram illustrating an embodiment of the present invention that implements soft-start current and output voltage simulation using only programs;
FIG. 10 is a simulated waveform diagram of the direct open-loop starting current and the output voltage according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Aiming at the problem that the interleaved direct current converter mentioned in the background art generates the starting current peak, the invention provides a soft start circuit for the interleaved direct current converter and a control method thereof, compared with the traditional soft start mode of the interleaved direct current converter which mainly comprises program soft start and relay cut resistance soft start, the method of the embodiment of the invention can reduce the power consumption and the like, the traditional soft start mode can only start from the duty ratio of 0.5, although the effect of relieving the peak is achieved, the input current exceeds the standard, and the threat to the circuit safety is caused; the soft start of the relay cut resistor is usually applied to the soft start of a motor, and is applied to an interleaved direct current converter, once the resistor is cut, the relay is connected in series into a main power circuit, and because the contact resistance of the relay is large and the input current of the interleaved direct current converter is large, the loss of the contact conduction resistor is generated, the overall working efficiency of a system is reduced after the system is operated for a long time, and the soft start of the relay cut resistor is not suitable for occasions with high gain and high power density, such as the interleaved direct current converter.
A soft-start circuit for an interleaved dc converter and a control method thereof according to an embodiment of the present invention will be described with reference to the accompanying drawings.
The following first describes a soft start circuit for an interleaved dc converter according to an embodiment of the present invention.
FIG. 1 is a schematic diagram of a soft-start circuit for an interleaved DC converter according to an embodiment of the present invention, wherein the soft-start circuit is connected in parallel with a second inductor L of the external circuit, as shown in FIG. 12The soft start circuit for the interleaved DC converter comprises: auxiliary diode DaAuxiliary switch tube SaAuxiliary resistor RaWherein an auxiliary diode DaIs connected with an external circuit, and an auxiliary resistor RaOne end of the auxiliary switch tube S is respectively connected with an external circuitaAnd the auxiliary diode DaIs connected with the cathode of the auxiliary switch tube SaSource or emitter and auxiliary resistor RaAnd the other end of the two are connected.
The external circuit may be any circuit suitable for the soft start circuit in the embodiment of the present invention, such as a multiphase interleaved parallel dc converter, for example, a multi-phase interleaved bidirectional dc converter, and the like.
In one embodiment of the invention, the external circuit is an interleaved dc converter, which in some possible embodiments, with continued reference to fig. 1, comprises: DC input source VINA first inductor L1A second inductor L2A first power switch tube S1A second power switch tube S2Boost unit, output load resistor RLWherein, in the step (A),
DC input source VINPositive pole and first inductance L1Is connected to a DC input source VINNegative pole of (1) and first power switch tube S1And a second power switch tube S2A source or emitter connection of;
first power switch tube S1And the first inductor L1Is connected with the other end of the first power switch tube S2Of the drain electrode orCollector and second inductor L2The other end of the first and second connecting rods is connected;
first inductance L1One terminal of (1), a second inductance L2And a direct current input source VINAnd the anode of the capacitor is connected with an auxiliary resistor RaIs connected with one end of the connecting rod;
second inductance L2And the other end of the second power switch tube S2And the auxiliary diode DaAre connected with each other.
With continued reference to FIG. 1, in one embodiment of the present invention, an output load resistor RLAnd is connected with the boosting unit. In some possible examples, one end of the boosting unit and the second power switch tube S2Is connected with the drain electrode or the collector electrode of the voltage boosting unit, and the other end of the voltage boosting unit is connected with the first power switch tube S1Is connected to the drain or collector of the transistor.
To sum up, the soft start circuit for the interleaved dc converter according to the embodiment of the present invention provides a soft start branch of an external circuit, has a high degree of freedom of the duty cycle step length in the control method during the soft start process, can be automatically adjusted according to the actual situation, is safe and reliable, and the soft start circuit only works during the soft start process, and the soft start circuit assists the diode DaAuxiliary switch tube SaAnd an auxiliary resistor RaThe power loss generated in a short time is small, the loss of a main power loop caused by contact resistance after the soft start of the relay switch resistor is avoided, the number of components used by a soft start circuit is small, the circuit structure is simple, the whole technical scheme of the soft start is easy to realize, and the soft start circuit has a good inhibition effect on the starting current spike of the staggered direct current converter.
A control method of a soft-start circuit for an interleaved dc converter according to an embodiment of the present invention will be described with reference to specific embodiments.
Specifically, fig. 2 is a flowchart of a control method for a soft-start circuit of an interleaved dc converter according to an embodiment of the present invention, and as shown in fig. 2, the control method for the soft-start circuit of the interleaved dc converter includes:
step 101, in the process of soft starting the soft start circuit, acquiring a target power switch tube which is conducted in the current switching period.
It will be appreciated that when the external circuit is the circuit of figure 1 described above, this is for the purpose of supplying the load RLPower supply, first power switch tube S1A second power switch tube S2Auxiliary switch tube S of soft start circuitaWorking according to time sequence and comprising three working modes, wherein one mode is a first power switch tube S of an external circuit shown in figure 31Conduction mode, external circuit second power switch tube S2Auxiliary switch tube S of turn-off mode and soft start circuitaTurn-off mode, a first power switch S of the external circuit shown in FIG. 41Second power switch tube S of off mode and external circuit2Auxiliary switch tube S of turn-off mode and soft start circuitaConduction mode, a first power switch tube S of the external circuit shown in FIG. 51Second power switch tube S of off mode and external circuit2Conducting mode, soft starting circuit auxiliary switch tube SaA shutdown mode.
The working timing diagram of the three switching tubes is shown in fig. 6, and in the first half period of each switching period, the first power switching tube S1Conducting soft starting circuit auxiliary switch tube SaIn the first half period (I and II in the figure) and the first power switch tube S1The phase-shifting duty cycles of the first power switch tube S are complementary, and in the second half period (III and IV in the figure) of each switching period, the second power switch tube S2Conducting soft starting circuit auxiliary switch tube SaIn the second half period and the second power switch tube S2The phase-shifted duty cycles of (a) and (b) are complementary.
And 102, acquiring a first real-time phase-shifting duty ratio of the target power switch tube, and calculating a phase-shifting duty ratio difference value of the target phase-shifting duty ratio and the first real-time phase-shifting duty ratio.
In this embodiment, a first real-time phase-shifting duty cycle of the target power switching tube is obtained, and a phase-shifting duty cycle difference between the target phase-shifting duty cycle and the first real-time phase-shifting duty cycle is calculated, where the target phase-shifting duty cycle can be understood as the complementary sum, so as to ensure that the real-time phase-shifting duty cycle is in a target value state within a switching period.
And 103, judging whether the phase shift duty ratio difference is larger than 0.
It is understood that the external circuit power switch tube S is judged by judging whether the phase-shifting duty ratio difference value is larger than 01、S2Whether the phase shift duty cycle is increased to the target phase shift duty cycle, i.e., whether there is no dead time.
104, if the phase ratio is larger than 0, controlling an auxiliary switch tube S according to the phase-shifting duty ratio difference valueaThe second real-time phase-shifted duty cycle.
In this embodiment, if greater than 0, it indicates that there is a dead time, and the auxiliary switch tube S is controlled according to the phase-shift duty ratio differenceaSecond real-time phase-shift duty cycle, i.e. the auxiliary switching tube S at that timeaThe phase-shifting duty ratio is the phase-shifting duty ratio difference.
In another embodiment of the present invention, if the value is equal to 0, the soft start process of the soft start circuit is ended, and the external circuit is controlled to enter the open-loop operating state, i.e., the soft start circuit is no longer used to provide the supplement of the phase-shift duty ratio.
In another embodiment of the present invention, the target phase shift duty ratio is 0.5, and then as shown in fig. 7, the external circuit power switch tube S is used in units of switching period during the soft start process after the duty ratio initialization1、S2The phase-shift duty ratio is increased from the minimum duty ratio to 0.5 in fixed step length, and the soft start circuit auxiliary switch tube S is complementary with the minimum duty ratioaA control method for reducing the duty ratio of the two phase shifts from nearly 0.5 to 0 with fixed step length; when the external circuit power switch tube S1、S2And after the phase-shifting duty ratio is increased to 0.5, namely no dead time exists, the soft start process is ended, and the open-loop working state is entered.
The soft start circuit for the interleaved dc converter and the control method thereof according to the embodiment of the present invention are subjected to functional verification and circuit simulation verification in combination with a specific embodiment. In order to verify the soft start circuit for the interleaved dc converter and the control method thereof according to the embodiment of the present invention, a simulation platform is built according to the simulation parameters in table 1, and fig. 8, 9 and 10 are simulation results. As shown in fig. 8, the soft start circuit for the interleaved dc converter and the control method thereof provided by the present invention start current and output voltage simulation waveforms, and an 18A input current peak is generated in the soft start process, and the output voltage peak in the voltage smooth adjustment process is very small, and the peak value is 150V; as shown in fig. 9, in an embodiment of the present invention, a program is only used to implement a simulation waveform of the soft start current and the output voltage, and the program soft start may generate an input current peak of 81A and an output voltage peak of 234V; fig. 10 shows simulated waveforms of direct open-loop start-up current and output voltage according to an embodiment of the present invention, where the direct open-loop start-up would generate 116A input current spike and 332V output voltage spike.
TABLE 1
Figure BDA0002807581620000061
According to the table 1 and the constructed simulation, the soft start circuit for the interleaved direct current converter and the control method thereof can realize the soft start of the interleaved direct current converter. The starting time is 0.12s, the starting time is short, the power loss of the soft starting circuit is small, and the normal work of the interleaved direct current converter is not influenced by the working state of the soft starting circuit during the soft starting. As shown in fig. 8, the output voltage is smoothly built up in the soft start process in this way, and when the open-loop operating state is entered, the inductor current quickly reaches the charge-discharge balance, so that a high current spike is not generated, and the start current spike is suppressed.
In summary, according to the control method of the soft start circuit for the interleaved dc converter of the embodiment of the present invention, compared with the program soft start and the open-loop direct start, the soft start circuit for the interleaved dc converter and the control method thereof can effectively reduce the start current spike, reduce the path loss, and improve the operation reliability of the interleaved dc converter. The method can be well applied to the interleaved direct current converter, so that the interleaved direct current converter can realize reliable soft start. The power electronic converter applied by the invention has wide application prospect in a new energy distributed power generation system.
In order to implement the foregoing embodiment, the present invention further provides a computer device, including: the soft start circuit, the processor, and the memory for storing the processor executable instructions in the above embodiments. A computer program stored on the memory and operable on the processor is executed by the processor to implement the control method described in the above embodiments.
In order to implement the above embodiments, the present invention also proposes a non-transitory computer-readable storage medium in which instructions, when executed by a processor, enable execution of the control method described in the above embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (12)

1. A soft start circuit for an interleaved dc converter, comprising:
auxiliary diode DaAuxiliary switch tube SaAuxiliary resistor RaWherein the auxiliary diode DaIs connected to an external circuit, the auxiliary resistor RaIs respectively connected with an external circuit, the auxiliary switchPipe SaAnd said auxiliary diode DaIs connected to the cathode of the auxiliary switching tube SaAnd the source or emitter of (2) and the auxiliary resistor RaAnd the other end of the two are connected.
2. The soft-start circuit of claim 1, wherein the external circuit is an interleaved dc converter.
3. The soft-start circuit of claim 2, wherein the interleaved dc converter comprises: DC input source VINA first inductor L1A second inductor L2A first power switch tube S1A second power switch tube S2Boost unit, output load resistor RLWherein, in the step (A),
the DC input source VINAnd the first inductor L1Is connected to the DC input source VINAnd the first power switch tube S1And the second power switch tube S2A source or emitter connection of;
the first power switch tube S1And the first inductor L1Is connected with the other end of the first power switch tube S2And the drain or collector of and the second inductor L2The other end of the first and second connecting rods is connected;
the first inductor L1One terminal of the second inductor L2And said DC input source VINAnd the positive electrode of the resistor is connected with the auxiliary resistor RaIs connected with one end of the connecting rod;
the second inductor L2And the other end of the second power switch tube S2And said auxiliary diode DaAre connected with each other.
4. The soft-start circuit of claim 3,
the output load resistor RLAnd is connected with the boosting unit.
5. The soft-start circuit of claim 3,
one end of the boosting unit and the second power switch tube S2Is connected with the drain electrode or the collector electrode;
the other end of the boosting unit and the first power switch tube S1Is connected to the drain or collector of the transistor.
6. A method for controlling a soft-start circuit of an interleaved dc converter, wherein the soft-start circuit is a soft-start circuit according to any one of claims 1-5, the method comprising the steps of:
in the process of soft starting the soft start circuit, acquiring a target power switch tube which is conducted under the current switching period;
acquiring a first real-time phase-shifting duty ratio of the target power switch tube, and calculating a phase-shifting duty ratio difference value of the target phase-shifting duty ratio and the first real-time phase-shifting duty ratio;
judging whether the phase-shifting duty ratio difference value is larger than 0;
if the phase shift duty ratio difference is larger than 0, the auxiliary switch tube S is controlled according to the phase shift duty ratio differenceaThe second real-time phase-shifted duty cycle.
7. The method of claim 6, wherein the target power switch tube comprises:
a first power switch tube S in the external circuit1And a second power switch S in the external circuit2One kind of (1).
8. The method of claim 7, wherein the operating modes during the soft start of the soft start circuit comprise:
the first power switch tube S of the external circuit1Conduction mode, the external circuit second power switch tube S2Off mode, auxiliary switch tube S of said soft start circuitaA shutdown mode;or the like, or, alternatively,
the first power switch tube S of the external circuit1Off mode, the external circuit second power switch tube S2Off mode, auxiliary switch tube S of said soft start circuitaConduction mode; or the like, or, alternatively,
the first power switch tube S of the external circuit1Off mode, the external circuit second power switch tube S2Conduction mode, auxiliary switch tube S of soft start circuitaA shutdown mode.
9. The method of claim 6,
the target phase shift duty cycle is 0.5.
10. The method of claim 6, further comprising, after said determining whether the phase shifted duty cycle difference is greater than 0:
if the voltage is equal to 0, the soft start process of the soft start circuit is finished, and the external circuit is controlled to enter an open-loop working state.
11. A computer device comprising a soft-start circuit as claimed in any one of claims 1 to 5, a memory, a processor and a computer program stored on the memory and executable on the processor, the processor when executing the computer program implementing a method as claimed in any one of claims 6 to 10.
12. A non-transitory computer-readable storage medium, having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the method of any one of claims 6-10.
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