CN114301299A - Converter efficiency determination method - Google Patents
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Abstract
The application relates to a converter efficiency determination method, which comprises the following steps: acquiring one or more first phase shifting angles; for each first phase shifting angle in the one or more first phase shifting angles, acquiring a plurality of second phase shifting angles corresponding to the first phase shifting angle; obtaining a plurality of operating efficiencies corresponding to a plurality of second phase shifting angles; and determining the target efficiency of the converter according to the acquired plurality of operating efficiencies corresponding to each first phase shifting angle. The converter efficiency determination method further includes controlling the converter to operate at a parameter corresponding to the target efficiency. In the operation process of the converter, the target operation efficiency of the converter is obtained by changing the parameters of the converter, and the converter is controlled to operate under the parameters corresponding to the target efficiency, so that the operation efficiency and/or stability of the converter are improved, the accuracy of operation control of the converter is improved, and the energy loss is reduced.
Description
Technical Field
The present application relates to the field of converter technologies, and in particular, to a method for determining an efficiency of a converter.
Background
A double-active full-bridge converter is a bidirectional isolation type DC-DC (Direct current-Direct current converter) circuit topology. The circuit can realize bidirectional flow of electric energy, has higher power density, and can realize soft switching of a high-frequency switching tube. The circuit is commonly used in products with a link of converting direct current into direct current, such as direct current power supplies, battery charging and discharging equipment, Uninterruptible Power Supplies (UPS) and the like.
The loss of the converter is reduced, and the efficiency and the reliability of the converter can be improved. In a conventional control method, a control method is generally established based on a converter parameter (inductance, capacitance, etc.) designed in advance, and the control is performed by this method. In the final finished product production and actual operation process of the converter, parameters such as inductance and capacitance may not be consistent with designed parameters, so that the converter cannot be controlled according to the actual operation condition of the converter.
Therefore, it is desirable to provide a method for determining a target efficiency of a converter during operation of the converter, thereby improving the operation efficiency and/or stability of the converter and further reducing the access loss of energy.
Disclosure of Invention
The present application is directed to a method for determining target efficiency during converter operation, so as to solve the problems mentioned in the background art.
In order to achieve the above purpose, the present application provides the following technical solutions:
a converter efficiency determination method, comprising: acquiring one or more first phase shifting angles; for each first phase shifting angle in the obtained one or more first phase shifting angles, obtaining a plurality of second phase shifting angles corresponding to the obtained one or more first phase shifting angles; determining a plurality of operating efficiencies of the converter corresponding to a plurality of second phase shifting angles; a target efficiency of the converter is determined based on the determined plurality of operating efficiencies corresponding to each of the first phase shift angles.
According to some embodiments of the present application, the first phase-shifting angle may range from [120 °, 180 ° ], and the second phase-shifting angle may range from [0 °, 60 ° ].
According to some embodiments of the application, the converter may comprise a dual active full bridge converter.
According to some embodiments of the present application, the converter may include a first circuit and a second circuit, the first circuit may include a first switch tube, a second switch tube, a third switch tube, a fourth switch tube, and a corresponding anti-parallel diode and a first voltage stabilizing capacitor; the second circuit comprises a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, a corresponding anti-parallel diode and a second voltage-stabilizing capacitor.
According to some embodiments of the present application, determining a plurality of operating efficiencies corresponding to a plurality of second phase shifting angles may comprise: for each second phase shifting angle of the plurality of second phase shifting angles, changing the third phase shifting angle such that a difference between the first voltage and the second voltage is greater than a voltage threshold and such that the second output power is within a power threshold range; an operating efficiency corresponding to the second phase shift angle is determined.
According to some embodiments of the present application, determining a target efficiency of the converter from the determined plurality of operating efficiencies corresponding to each of the first phase shift angles may include: determining the maximum operation efficiency of the plurality of operation efficiencies according to the plurality of determined operation efficiencies corresponding to each first phase shifting angle; the maximum operating efficiency is determined as the target efficiency.
According to some embodiments of the present application, the first phase shift angle may be a phase difference between conduction times of at least two of the first switching tube, the second switching tube, the third switching tube or the fourth switching tube.
According to some embodiments of the present application, the second phase shift angle may be a phase difference between conduction times of the first switching tube and the fifth switching tube.
According to some embodiments of the present application, the third phase shift angle may be a phase difference between conduction times of at least two of the fifth switching tube, the sixth switching tube, the seventh switching tube, or the eighth switching tube.
According to some embodiments of the present application, a converter efficiency determination method may further include obtaining a first phase shift angle, a second phase shift angle, and a third phase shift angle corresponding to a target efficiency; controlling the converter to operate at the first phase shifting angle, the second phase shifting angle, and the third phase shifting angle.
Compared with the prior art, the beneficial effects of this application are:
1. the present application is a method for determining converter efficiency by dynamically varying a parameter of a converter (e.g., a first phase shift angle, a second phase shift angle, a third phase shift angle, etc.) during operation of the converter to determine a target operating efficiency of the converter;
2. controlling the converter to operate under parameters (such as a first phase shift angle, a second phase shift angle, a third phase shift angle and the like) corresponding to the target efficiency of the converter, so as to improve the operation efficiency/operation stability and the like of the converter;
3. according to the real-time operation condition of the converter circuit, the operation parameters of the converter are adjusted in time, and the actual operation efficiency of the converter is improved.
Drawings
FIG. 1A is a schematic diagram of an exemplary converter circuit shown in accordance with some embodiments of the present application;
FIG. 1B is a schematic diagram of an exemplary simplified converter circuit shown in accordance with some embodiments of the present application;
FIG. 2 is a waveform diagram of an exemplary first phase shifting angle, shown in accordance with some embodiments of the present application;
FIG. 3 is a waveform diagram illustrating an exemplary third phase shifting angle according to some embodiments of the present application;
FIG. 4 is a waveform diagram illustrating an exemplary second phase shifting angle according to some embodiments of the present application;
FIG. 5 is a flow chart of a converter efficiency determination method according to some embodiments of the present application;
FIG. 6 is a flow chart illustrating converter efficiency determination methods according to further embodiments of the present application.
Detailed Description
In order to make the technical solution and advantages of the present application more comprehensible, a detailed description is given below by way of specific examples. Wherein the figures are not necessarily to scale, and certain features may be exaggerated or minimized to more clearly show details of the features; unless defined otherwise, technical and scientific terms used herein have the same meaning as those in the technical field to which this application belongs.
Fig. 1A is a schematic diagram of an exemplary converter circuit shown in accordance with some embodiments of the present application. In some embodiments, the converter may include a unidirectional converter and a bidirectional converter. For convenience of description, the present application takes a dual-active full-bridge converter as an example for illustration.
As shown in fig. 1A, a dual active full bridge inverter circuit 100 may include a first circuit 110 and a second circuit 120. The first circuit 110 may include a first voltage stabilizing capacitor C1, a first switching tube Q1, a second switching tube Q2, a third switching tube Q3, a fourth switching tube Q4, and an anti-parallel diode corresponding to the switching tubes. Similarly, the second circuit 120 may include a fifth switching tube Q5, a sixth switching tube Q6, a seventh switching tube Q7, an eighth switching tube Q8, an anti-parallel diode corresponding to the switching tube, and a second voltage stabilizing capacitor C2. Switching tubes (e.g., switching tubes Q1-Q8) may be used for the switching circuit. In some embodiments, the switch tube may include a MOSFET, an IGBT, a triode, and the like. Voltage stabilizing capacitors (e.g., voltage stabilizing capacitors C1 and C2) may be used to suppress voltage fluctuations in the circuit, stabilizing the circuit voltage. A transformer T is provided between the first circuit 110 and the second circuit 120. The transformer T may be used to convert a first voltage output by the first circuit 120 into an input voltage of the second circuit 120.
Fig. 1B is a schematic diagram of an equivalent circuit of the dual active full bridge inverter circuit 100 shown in fig. 1A. As shown in fig. 1B, the circuit 105 may include a first circuit 110, a second circuit 120, an inductor L, and a transformer T.
In some embodiments, the dual-active full-bridge converters 100 and/or 105 may be used for energy transfer, for example, after the electric energy from the energy source 130 is rectified by the first circuit 110, a corresponding input voltage may be generated at the second circuit 120 through the inductor L and the transformer T. The input voltage of the second circuit 120 is rectified by devices (e.g., one or more of the switching transistors Q5-Q8, the second voltage-stabilizing capacitor C2, etc.) in the second circuit 120 and then transmitted to the energy storage 140 for storage. In this case, the first circuit 110 may be referred to as a primary circuit, an input circuit, or a primary circuit, and the second circuit 120 may be referred to as a secondary circuit, an output circuit, or a secondary circuit. In some embodiments, the second circuit 120 can be a primary circuit, an input circuit, or a primary circuit, and correspondingly, the first circuit 110 can be a secondary circuit, an output circuit, or a secondary circuit. In this case, energy may be transferred from the second circuit 120 to the first circuit 110, where 130 represents the energy storage and 140 represents the energy source, in a similar manner as energy is transferred from the first circuit 110 to the second circuit 120. For convenience of description, the first circuit 110 is taken as a primary circuit, and the second circuit 120 is taken as a secondary circuit.
As shown in FIG. 1B, the input voltage of the first circuit 110 is the first input voltage U1The power is the first output power P1The output voltage is the first output voltage Up(ii) a The voltage at the first inductor L is ULThe power transferred at the inductance L is PT(ii) a The input voltage of the second circuit 120 is the second input voltage UsThe output voltage is the second output voltage U2The output power is the second output power P2. Losses in converter circuits 100 and/or 105 may include power losses at first circuit 110 (e.g., switching tubes Q1-Q4) (which may also be referred to as first power loss P)Loss1) Line resistive losses, power losses at the second circuit 120 (e.g., switching transistors Q5-Q8) (which may also be referred to as second power loss P)Loss2) And the like.
In some embodiments, losses and/or outputs (e.g., phase shift angle, output voltage, output power, operating efficiency, etc.) of the circuits 100 and/or 105 may be controlled by controlling parameters of one or more devices in the circuits 100 and/or 105.
Specifically, the first output voltage may be represented by equation (1):
wherein, U1Representing a first input voltage, Up representing a first output voltage, phipRepresenting a first phase shift angle, theta represents the initial phase angle of the first input voltage.
The second input voltage may be represented by equation (2):
wherein, USRepresenting a second input voltage, phisRepresents a third phase shift angle, U2Represents the second output voltage, theta represents the initial phase angle of the first input voltage, phip-SRepresenting a second phase shift angle.
The voltage at the first inductance L can be represented by equation (3):
wherein, U1Representing the voltage at the inductor L, Up representing the first output voltage, N representing the turns ratio of the inductor L, USRepresenting the second input voltage.
The current generated by the voltage at the first inductor L can be represented by equation (4):
wherein, ULRepresenting the voltage at the inductance L, ILThe current at the inductor L is shown, j is an imaginary symbol, w is an angular frequency, and L is the inductance of the inductor.
The power transferred at the inductance L can be represented by equation (5):
wherein, PTRepresenting the power transferred at the inductance L, ULRepresenting the voltage at the inductance L, ILRepresenting the current at the inductance L.
Fig. 2 is a waveform diagram illustrating an exemplary first phase shifting angle according to some embodiments of the present application. As shown in FIG. 2, the abscissa of the waveform diagram 200 represents time and the ordinate represents signals (e.g., driving signals and/or voltage signals of a switching tube), wherein 210 representsA driving signal of a first switching tube (for example, the first switching tube Q1 in fig. 1A), 220 represents a driving signal of a second switching tube (for example, the second switching tube Q2 in fig. 1A), 230 represents a driving signal of a third switching tube (for example, the third switching tube Q3 in fig. 1A), 240 represents a driving signal of a fourth switching tube (for example, the fourth switching tube Q4 in fig. 1A), and 250 represents a first output voltage signal. In some embodiments, the parameters of the above switch tube can be set according to actual needs. For example, the duty ratio of the first switching tube and the second switching tube may be set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%. For example only, the duty ratio of the first switching tube and the second switching tube may be set to 50%, and the first switching tube and the second switching tube may be made to conduct complementarily. For another example, the duty ratios of the third switching tube and the fourth switching tube may be set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%. For example only, the duty ratio of the third switching tube and the fourth switching tube may be set to 50%, and thus the third switching tube and the fourth switching tube may be made to conduct complementarily. Duty cycle is understood to be the proportion of the time of energization to the total time within a pulse cycle. The first input voltage can generate a first output voltage through an H-bridge circuit formed by a first switching tube, a second switching tube, a third switching tube and/or a fourth switching tube. For example only, when the first input voltage is a dc voltage, a primary side high frequency ac voltage may be generated after being inverted by the H-bridge circuit. The phase difference between the conduction times of the first switch tube and the third switch tube or between the second switch tube and the fourth switch tube can be called a first phase shift angle phip. In some embodiments, a parameter of the first output voltage, such as a magnitude of the first output voltage, may be changed by changing the first phase shift angle. The first output voltage may be calculated in a manner referred to equation (1).
Fig. 3 is a waveform diagram illustrating an exemplary third phase shifting angle according to some embodiments of the present application. The abscissa t of the waveform diagram 300 shown in fig. 3 represents time and the ordinate represents signals (e.g., driving signals, voltage signals, etc. of the switching tubes), wherein 310 represents a driving signal of a fifth switching tube (e.g., the fifth switching tube Q5 in fig. 1A), 320 represents a driving signal of a sixth switching tube (e.g., the sixth switching tube Q6 in fig. 1A), 330 represents a driving signal of a seventh switching tube (e.g., the seventh switching tube Q7 in fig. 1A), 340 represents a driving signal of an eighth switching tube (e.g., the eighth switching tube Q8 in fig. 1A), and 350 represents a second input voltage signal. In some embodiments, the parameters of the switching tube can be set according to actual needs. For example, the duty ratio of the third fifth switching tube and the sixth switching tube may be set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%. For example only, the duty ratio of the fifth switching tube and the sixth switching tube may be set to 50%, and thus the fifth switching tube and the sixth switching tube may be made to conduct complementarily. For another example, the duty ratios of the seventh switching tube and the eighth switching tube may be set to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%. For example only, the duty ratio of the seventh switching tube and the eighth switching tube may be set to 50%, and the setting may be such that the duty ratio of the seventh switching tube and the eighth switching tube may be set to 50%, and the complementary conduction is performed. In some embodiments, the first output voltage may be subjected to a transformer (e.g., transformer T in fig. 1A) to generate the second input voltage.
In some embodiments, a parameter of the second input voltage, for example, a magnitude of the second input voltage, may be changed by changing the third phase shift angle. The second input voltage may be calculated in a manner referring to equation (2). The conduction time phase difference of the fifth switching tube, the sixth switching tube, the seventh switching tube and/or the eighth switching tube can be called as a third phase shift angle phis. The second phase shift angle may be understood as a phase difference of the first output voltage and the second input voltage. In some embodiments, the second phase shifting angle may be equivalent to a phase difference between the first switching tube and the fifth switching tube.
In some embodiments, the second input voltage may generate the second output voltage (e.g., the second output voltage U) through an H-bridge circuit composed of a fifth switch, a sixth switch tube, a seventh switch tube and/or an eighth switch tube2). By way of example only, through a transformerThe generated high-frequency alternating voltage can pass through rectification of an H-bridge circuit consisting of the fifth switching tube, the sixth switching tube, the seventh switching tube and/or the eighth switching tube and voltage stabilization of a capacitor, and the generated second output voltage can be direct-current voltage.
Fig. 4 is a waveform diagram illustrating an exemplary second phase shifting angle according to some embodiments of the present application. The abscissa t of the waveform diagram 400 shown in fig. 4 represents time and the ordinate represents a voltage signal, wherein 410 represents the first output voltage signal UPAnd 420 denotes a second input voltage signal Us. In some embodiments, the range of the first output voltage signal 410 may be [ + U [ ]1，-U1]. In some embodiments, the range of the second input voltage signal 420 may be [ + U [ ]2，-U2]. The first output voltage signal 410 and the second input voltage signal 420 have a phase difference of a second phase shift angle Φp-s。
In some embodiments, losses of circuitry (e.g., circuitry 100 and/or 105) in the converter may primarily include switching tube switching losses, line resistive losses, and the like. In some embodiments, losses in the circuit may be changed by changing the first phase shifting angle, the second phase shifting angle, and/or the third phase shifting angle during operation of the circuit. By reducing losses in the circuit, the operating efficiency of the converter can be improved.
Specifically, the operating efficiency of the converter can be expressed by equation (6):
where η represents the overall efficiency of the circuit, P1Denotes the first output power, P2Representing a second output power, wherein the first output power P1And a second output power P2Can be expressed by equations (7) and (8), respectively:
P1＝PT+PLoss1, (7)
P2＝PT-PLoss1, (8)
wherein, P1Representing a first output power, P, of a first circuit (e.g., first circuit 110 in FIG. 1A and/or FIG. 1B)2Representing a second output power, P, of a second circuit (e.g., the second circuit 120 of FIG. 1A and/or FIG. 1B)TRepresenting the power transferred at the inductance L, PLoss1Representing a first power loss, PLoss2Representing a second power loss.
In some embodiments, the current I may be controlled by controllingLSlightly lagging UPTo realize soft switching of the switch tube and reduce the first power loss PLoss1And a second power loss PLoss2. In some embodiments, I may beLAnd ULIn phase (or approximately in phase), thereby reducing reactive power in the circuit 120, further reducing the magnitude of the reactive current so that the total current amplitude is reduced, and finally reducing the resistive loss of the line. Therefore, in order to reduce the overall losses of the converter, the first and second power losses and the line impedance need to be balanced. The method comprises the steps of determining the target efficiency (e.g. the optimal efficiency point) of the converter by adjusting parameters (e.g. a first phase shifting angle, a second phase shifting angle, a third phase shifting angle and the like) of the converter during circuit operation so as to change the loss of a switching tube, the resistive loss of a line and the like in the circuit. Details of the determination method regarding the target operating efficiency of the converter can be found in fig. 5 and 6 and their associated description.
FIG. 5 is a flow chart of a converter efficiency determination method according to some embodiments of the present application.
At 510, one or more first phase shifting angles may be obtained.
For details of the first phase shifting angle and related details, reference may be made to fig. 1A-1B and fig. 2 and related description thereof.
In some embodiments, the first phase shift angle may be located within a first angular range. The first angle range can be set according to actual needs. For example, the first angular range may be [120 °, 180 ° ]. As another example, the first angular range may be [120 °, 150 ° ]. As another example, the first angular range may be [150 °, 180 ° ]. The first phase shifting angle is arranged in the first angle range, so that the calculation amount can be reduced, the efficiency of the efficiency determination process of the converter is improved, and the operation cost is reduced.
The first phase shift angle may be obtained manually, automatically or semi-automatically. In some embodiments, the user may manually input the first phase shift angle, for example, via an input device (e.g., a keyboard, a display screen, voice, etc.). In some embodiments, a user may manually input an initial value for the first phase shift angle, e.g., 120 °, 130 °, 140 °, 150 °, 160 °, 170 °, 180 °, etc., and a computing device (e.g., a computing device that controls the operation of the converter, etc.) may obtain one or more first phase shift angles according to certain preset rules. For example, the computing device may increase or decrease the initial value of the first phase shift angle by a step size within a first preset range to obtain one or more first phase shift angles. For another example, the computing device may randomly select a value within a first preset range as the one or more first phase shifting angles. Reference may be made to steps 681 and 682 of fig. 6 and the related description thereof for details of the acquisition of the first phase shift angle.
In 520, for each of the one or more acquired first phase shifting angles, a plurality of second phase shifting angles corresponding thereto may be acquired.
The second phase shift angle may be a phase difference of an output voltage of a first circuit (e.g., first circuit 110) and an input voltage of a second circuit (e.g., second circuit 120) of the converter. Details regarding the second phase shifting angle can be found in fig. 4 and its associated description.
In some embodiments, the second phase shift angle may be located within a second angular range. The second angle range can be set according to actual needs. For example, the second angular range may be [0 °, 60 ° ]. As another example, the second angular range may be [0 °, 30 ° ]. As another example, the second angular range may be [30 °, 45 ° ]. As another example, the second angular range may be [45 °, 60 ° ]. And the second phase shifting angle is set in the second angle range, so that the calculated amount can be reduced, the efficiency of the efficiency determination process of the converter is improved, and the operation cost is reduced.
In some embodiments, the number, value, etc. of the second phase shifting angles may be set according to actual needs. The second phase shift angle may be obtained manually, automatically or semi-automatically. In some embodiments, the user may manually enter the second phase shift angle, for example, via an input device (e.g., keyboard, display screen, voice, etc.). In some embodiments, a user may manually input an initial value for the second phase shift angle, e.g., 0 °, 30 °, 45 °, 60 °, etc., and a computing device (e.g., a computing device that controls the operation of the converter, etc.) may obtain one or more second phase shift angles according to certain preset rules. For example, the computing device may increase or decrease the initial value of the second phase shift angle by a step size within a second preset range, thereby obtaining a plurality of second phase shift angles. For another example, the computing device may randomly select a number within a second preset range as the plurality of second phase shifting angles.
At 530, a plurality of operating efficiencies corresponding to a plurality of second phase shifting angles may be determined. In some embodiments, at one or more first phase shift angles ΦpA specific first phase shift angle phipi(i is an integer of 1 or more) as an example, the first phase shift angle ΦpiCan correspond to a plurality of second phase shifting angles phip-s1，…,Φp-sj(j is an integer of 1 or more). For example, the first phase shift angle is 120 °, and the corresponding second phase shift angle may be 0 °, 30 °, 45 °, 60 °.
Operating efficiency may be understood as the efficiency of operation of the converter when operating at a particular first phase shift angle and its corresponding plurality of second phase shift angles. In some embodiments, the operating efficiency may be an overall operating efficiency of the converter when the output power of the second circuit is within a power threshold range. In some embodiments, the operating efficiency of the transformer at the first phase shifting angle and the corresponding plurality of second phase shifting angles may be obtained by varying the third phase shifting angle such that the difference between the second input voltage and the first output voltage is greater than the voltage threshold and/or such that the second output power (i.e., the output power of the second circuit) is within the power threshold range. The voltage threshold and/or the power threshold range may be set according to actual conditions, and this application is not limited thereto. The operating efficiency of the converter can be calculated according to equation (6).
In some embodiments, among the plurality of second phase shifting anglesEach second phase shift angle of (a) corresponds to an operating efficiency. For example, at a first phase shift angle of 120 ° and a second phase shift angle of 0 °, the converter may operate with an efficiency of η11. As another example, at a first phase shift angle of 120 ° and a second phase shift angle of 30 °, the converter may operate with an efficiency of η12. As another example, at a first phase shift angle of 120 ° and a second phase shift angle of 45 °, the converter may operate with an efficiency of η13. As another example, at a first phase shift angle of 120 ° and a second phase shift angle of 60 °, the converter may operate with an efficiency of η14。
The converter being at a first phase shift angle phipiAnd a plurality of second phase shifting angles phi corresponding theretop-s1，…，Φp-sjRunning to determine a plurality of operating efficiencies eta corresponding to the first phase shift anglei1，…，ηij。
At 540, a target efficiency of the converter may be determined based on the determined plurality of operating efficiencies corresponding to each of the first phase shift angles.
From step 530, the operating efficiency of the converter at different first and second phase shift angles, respectively, can be determined. For example, the first phase shift angle is Φp1,…,Φpi,…,ΦPm(where m is an integer greater than or equal to i), the converter operating at a first phase shift angle Φp1And a second phase shift angle phis1，…,ΦsjRunning down, a first phase shift angle Φ can be determinedp1Corresponding operating efficiency η11，…，η1j. Similarly, or analogously, the converter is at a first phase shift angle ΦpiAnd a second phase shift angle phis1，…,ΦsjRunning down, a first phase shift angle Φ can be determinedpiCorresponding operating efficiency ηi1，…，ηij. The converter being at a first phase shift angle phipmAnd a second phase shift angle phis1，…,ΦsjRunning down, a first phase shift angle Φ can be determinedPmCorresponding operating efficiency ηm1，…，ηmj。
The target efficiency may be understood as an efficiency that satisfies a predetermined condition among operating efficiencies determined by the converter operating at different operating parameters (e.g., a first phase shift angle, a second phase shift angle, a third phase shift angle, etc.). In some embodiments, the predetermined condition may be a higher operating efficiency of the converter. For example, a maximum operating efficiency of the plurality of operating efficiencies may be determined as the target efficiency. In some embodiments, the predetermined condition may be an average operating efficiency of the converter, e.g., an average of a plurality of operating efficiencies may be determined as the target efficiency. In some embodiments, the predetermined condition may be a stable operating efficiency of the converter, e.g., a mode of the plurality of operating efficiencies may be determined as the target efficiency.
In some embodiments, after the target efficiency of the converter is determined, the converter may be controlled to operate at parameters (first phase shift angle, second phase shift angle, and/or third phase shift angle) corresponding to the target efficiency. Flow 500 may be performed before the transformer is run formally or during a debugging phase to determine operational parameters of the transformer at a target efficiency. The process 500 may also be performed during operation of the converter to adjust the operating parameters of the converter based on the actual operating conditions of the converter.
Through the process 500, on one hand, the operation efficiency of the converter can be determined according to the actual operation condition of the converter, and the accuracy of the circuit control of the converter is improved; on the other hand, the converter can be controlled to operate under parameters (such as a first phase shift angle, a second phase shift angle, a third phase shift angle and the like) corresponding to the target efficiency, so that the converter can be kept to operate under the target efficiency, and the operation efficiency/operation stability of the converter and the like are improved; on the other hand, the operation parameters of the converter can be adjusted according to the real-time operation condition of the converter circuit, and the actual operation efficiency of the converter is improved.
It should be noted that the above description related to the flow 500 is only for illustration and description, and does not limit the applicable scope of the present specification. Various modifications and changes to flow 500 may occur to those skilled in the art, given the benefit of this description. However, such modifications and variations are intended to be within the scope of the present description.
FIG. 6 is a flow chart illustrating converter efficiency determination methods according to further embodiments of the present application. In the process 600, the converter is exemplified as a dual-active full-bridge converter. Since the dual-full-bridge converter has a bilateral symmetrical topology, the process 600 is illustrated by taking power from a first circuit (e.g., the first circuit 110 in fig. 1A or 1B) to a second circuit (e.g., the second circuit 120 in fig. 1A or 1B) and vice versa.
At 610, the circuit is enabled and the converter circuit begins power transfer.
At 620, the first phase shift angle Φ is appliedpIs set to 120 deg., forming UPAnd outputting the high-frequency alternating voltage.
At 630, a third phase shift angle Φ is adjustedSSo that the second input voltage U of the second circuitSFirst input voltage U of first circuitPForming a voltage difference, forming power transmission, and maintaining a second output power P of the second circuit2And is not changed.
At 640, the second phase shift angle ΦP-SIs set to 0 deg..
At 650, a third phase shift angle Φ is adjustedSMake USAnd UPTo maintain a certain voltage difference and output power P2And is not changed. In some embodiments, the second phase shift angle ΦP-SMay change the power transmission direction of the converter circuit, the output power of the first circuit, the output power of the second circuit, etc. By adjusting the third phase-shifting angle phiSThe second input voltage may be adjusted to maintain a voltage difference between the first and second circuits.
At 660, the operating efficiency of the converter circuit at that time is recorded.
At 671, a second phase shift angle Φ is determinedP-SIf yes, 681 is executed; if not, 672 is performed.
At 672, the second phase shift angle ΦP-SAnd increasing by 1 degree, wherein the line resistive loss in the circuit is changed and the switching tube switching loss is also changed, and executing steps 650, 660 and 671.
At 681, a first phase shift angle Φ is determinedPIf the angle reaches 180 degrees, 690 is executed; if not682 is performed;
in 682, a first phase shift angle ΦPIncreasing 1 degree, repeating the steps 630-660, 671-672 until the first phase shift angle phiPFrom 120 to 180.
At 690, completing an efficiency search step, comparing the converter circuit efficiencies recorded after each previous step of adjustment one by one, and finding out a maximum efficiency point;
in 695, a set of phase shift angles Φ at maximum efficiency is usedS、ΦP、ΦP-STo operate the converter such that the converter operates at the point of maximum efficiency.
In the process 600, the real-time operating efficiency of the converter under different conditions can be obtained by changing parameters (e.g., the first phase shift angle, the second phase shift angle, the third phase shift angle, etc.) of the converter, so that the converter can be controlled according to the actual operating condition of the converter, the control accuracy of the circuit operation is improved, and the operating efficiency of the converter is improved.
It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may also be made on the basis of the above embodiments without departing from the scope of the present disclosure. Likewise, various features of the above embodiments may be arbitrarily combined to form further embodiments of the present application, which may not be explicitly described. Therefore, the above examples only express several embodiments of the present application, and do not limit the protection scope of the present patent application.
Claims (10)
1. A converter efficiency determination method, comprising:
acquiring one or more first phase shifting angles;
for each of the one or more acquired first phase shifting angles,
acquiring a plurality of second phase shifting angles corresponding to the first phase shifting angles;
determining a plurality of operating efficiencies of the converter corresponding to a plurality of the second phase shifting angles;
determining a target efficiency of the converter based on the determined plurality of operating efficiencies corresponding to each of the first phase shifting angles.
2. The converter efficiency determination method according to claim 1, characterized in that the first phase-shifting angle ranges from [120 °, 180 ° ], and the second phase-shifting angle ranges from [0 °, 60 ° ].
3. The converter efficiency determination method of claim 1 wherein the converter comprises a dual active full bridge converter.
4. The converter efficiency determination method according to claim 3, wherein the converter comprises a first circuit and a second circuit, the first circuit comprises a first switch tube, a second switch tube, a third switch tube, a fourth switch tube and a corresponding anti-parallel diode and a first voltage-stabilizing capacitor; the second circuit comprises a fifth switching tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, a corresponding anti-parallel diode and a second voltage-stabilizing capacitor.
5. The converter efficiency determination method of claim 4 wherein said determining a plurality of operating efficiencies corresponding to a plurality of said second phase shift angles comprises:
for each of a plurality of said second phase shifting angles,
changing a third phase shift angle such that a difference between a first output voltage of the first circuit and a second input voltage of the second circuit is greater than a voltage threshold and such that a second output power is within a power threshold range;
determining the operating efficiency corresponding to the second phase shift angle.
6. The converter efficiency determination method of claim 1 wherein said determining a target efficiency of said converter based on a determined plurality of said operating efficiencies corresponding to each of said first phase shift angles comprises:
determining the maximum operating efficiency of the plurality of operating efficiencies according to the plurality of determined operating efficiencies corresponding to each first phase shifting angle;
determining the maximum operating efficiency as the target efficiency.
7. The converter efficiency determination method of claim 4, wherein the first phase shift angle is a phase difference of conduction times of at least two of the first switch tube, the second switch tube, the third switch tube or the fourth switch tube.
8. The converter efficiency determination method of claim 4 wherein said second phase shift angle is a phase difference between conduction times of said first switching tube and said fifth switching tube.
9. The converter efficiency determination method of claim 4, wherein the third phase shift angle is a phase difference of conduction times of at least two of the fifth switching tube, the sixth switching tube, the seventh switching tube or the eighth switching tube.
10. The converter efficiency determination method of claim 1 further comprising:
acquiring a first phase shift angle, a second phase shift angle and a third phase shift angle corresponding to the target efficiency;
controlling the converter to operate at the first phase shifting angle, the second phase shifting angle, and the third phase shifting angle.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516224A (en) * | 2013-10-09 | 2014-01-15 | 清华大学 | Mixed phase-shifting control method used for dually-active full-bridge direct current converter |
| CN106357115A (en) * | 2016-08-29 | 2017-01-25 | 上海交通大学 | Phase-shift control method for bidirectional full-bridge DC-DC converter |
| CN110719030A (en) * | 2019-08-27 | 2020-01-21 | 河北工业大学 | Dual phase-shift modulation method for isolated bidirectional full-bridge DC-DC converter |
| CN112117906A (en) * | 2019-06-21 | 2020-12-22 | 天津工业大学 | Optimization method of double-active full-bridge converter under triple phase-shifting control |
-
2021
- 2021-11-17 CN CN202111361647.3A patent/CN114301299A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103516224A (en) * | 2013-10-09 | 2014-01-15 | 清华大学 | Mixed phase-shifting control method used for dually-active full-bridge direct current converter |
| CN106357115A (en) * | 2016-08-29 | 2017-01-25 | 上海交通大学 | Phase-shift control method for bidirectional full-bridge DC-DC converter |
| CN112117906A (en) * | 2019-06-21 | 2020-12-22 | 天津工业大学 | Optimization method of double-active full-bridge converter under triple phase-shifting control |
| CN110719030A (en) * | 2019-08-27 | 2020-01-21 | 河北工业大学 | Dual phase-shift modulation method for isolated bidirectional full-bridge DC-DC converter |
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