CN111130350A - Boost mode constant current control method and circuit of soft switch bidirectional direct current converter - Google Patents
Boost mode constant current control method and circuit of soft switch bidirectional direct current converter Download PDFInfo
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- CN111130350A CN111130350A CN202010052980.5A CN202010052980A CN111130350A CN 111130350 A CN111130350 A CN 111130350A CN 202010052980 A CN202010052980 A CN 202010052980A CN 111130350 A CN111130350 A CN 111130350A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention relates to a boost mode constant current control method and a control circuit of a soft switching bidirectional direct current converter, wherein the soft switching bidirectional direct current converter comprises a first input bridge arm, a second input bridge arm, a first output bridge arm and a second output bridge arm, and the control method comprises the following steps: when the soft switching bidirectional direct current converter is in a boosting mode, adjusting the duty ratio of the first output bridge arm according to the difference value of the output current of the first output bridge arm and a preset current; and when the duty ratio of the first output bridge arm reaches a first preset threshold value, adjusting the duty ratio of a preset phase shift angle, wherein the preset phase shift angle is the phase shift angle of the trigger pulse of the first input bridge arm leading the trigger pulse of the first output bridge arm. The invention can control the soft-switching bidirectional direct-current converter with optimal efficiency, and improves the stability and reliability of the system during operation.
Description
Technical Field
The invention relates to the technical field of electrical automation, in particular to a boost mode constant current control method and a boost mode constant current control circuit of a soft switching bidirectional direct current converter.
Background
With the increasing energy crisis, the demand for a dc power supply with higher efficiency, higher power density and wide input/output range is increasing. In a small-current high-frequency occasion, the switching-on and switching-off loss of the switching tube forms the vast majority of circuit loss, and the reduction of the loss has important significance for further improving the switching frequency and improving the power density.
In the traditional converter control method, the switch tube belongs to hard switching-on, the voltage and the current are not zero in the switching-on process, electromagnetic interference and switching-on loss can be generated, and the converter control method is not suitable for occasions with high frequency, high efficiency and high power density.
Currently, soft-switching modulation strategies for four-switch Boost-Boost (Buck-Boost) converters are known in the prior art, but no specific control method for controlling the system based on efficiency optimization is given.
Disclosure of Invention
Therefore, there is a need for a boost-mode constant-current control method and circuit for a soft-switching bidirectional dc converter, which can control the soft-switching bidirectional dc converter with optimal efficiency and improve the stability and reliability of the system during operation.
One aspect of the present invention provides a boost mode constant current control method for a soft-switching bidirectional dc converter, including: the bridge comprises a first input bridge arm, a second input bridge arm, a first output bridge arm and a second output bridge arm; the method comprises the following steps: when the soft switching bidirectional direct current converter is in a boosting mode, adjusting the duty ratio of the first output bridge arm according to the difference value of the output current of the first output bridge arm and a preset current; and when the duty ratio of the first output bridge arm reaches a first preset threshold value, adjusting the duty ratio of a preset phase shift angle, wherein the preset phase shift angle is the phase shift angle of the trigger pulse of the first input bridge arm leading the trigger pulse of the first output bridge arm.
In one embodiment, the method further includes, while adjusting the duty cycle of the first output bridge arm, controlling the duty cycle of the preset phase shift angle to be maintained unchanged; and controlling the duty ratio of the first output bridge arm to be kept unchanged when the duty ratio of the preset phase shifting angle is adjusted.
In one embodiment, the adjusting the duty ratio of the first output bridge arm according to the difference between the output current of the first output bridge arm and a preset current includes: sampling the output current of the first output bridge arm, and calculating the difference value between the output current of the first output bridge arm and the preset current; carrying out proportional integral adjustment processing on the difference value to obtain a first signal to be processed; carrying out amplitude limiting processing on the first signal to be processed to obtain a first duty ratio signal; and controlling the switching state of the first output bridge arm according to the first duty ratio signal.
In one embodiment, the clipping process is configured to limit the upper limit of the first duty cycle signal not to exceed the first preset threshold.
In one embodiment, the adjusting the duty cycle of the preset phase shift angle includes: acquiring the ratio of the duty ratio of the trigger pulse of the first input bridge arm to the duty ratio of the trigger pulse of the first output bridge arm; multiplying the first signal to be processed according to the ratio to obtain a second signal to be processed; performing superposition processing on the second signal to be processed according to the ratio and a second preset threshold value to obtain a second duty ratio signal; and controlling the duty ratio of the preset phase shifting angle according to the second duty ratio signal.
In one embodiment, the multiplying the first signal to be processed according to the ratio specifically includes: and multiplying the first signal to be processed by the difference value between the ratio and a preset value to obtain a second signal to be processed.
In one embodiment, the method further comprises adjusting the duty cycle of the first input leg according to the first duty cycle signal and the ratio.
In another aspect, the present invention further provides a boost-mode constant-current control circuit for a soft-switching bidirectional dc converter, the control circuit comprising: the first duty ratio regulating circuit is used for connecting a first output bridge arm of the soft-switching bidirectional direct-current converter and regulating the duty ratio of the first output bridge arm according to the difference value of the output current of the first output bridge arm and the preset current when the soft-switching bidirectional direct-current converter is in a boosting mode; and the second duty ratio regulating circuit is used for connecting a first output bridge arm and a first input bridge arm of the soft-switching bidirectional direct-current converter, and regulating the duty ratio of a preset phase shift angle when the duty ratio of the first output bridge arm reaches a first preset threshold value, wherein the preset phase shift angle is the phase shift angle of the trigger pulse of the first input bridge arm leading the trigger pulse of the first output bridge arm.
In one embodiment, the first duty cycle adjustment circuit comprises: the proportional-integral regulator is connected with the first output bridge arm and is used for sampling the output current of the first output bridge arm, taking the output current of the first output bridge arm and a preset current as a differential input signal, and performing proportional-integral regulation processing on the differential input signal to obtain a first signal to be processed; and the amplitude limiting circuit is connected with the proportional-integral regulator and the first output bridge arm and is used for carrying out amplitude limiting processing on the first signal to be processed to obtain a first duty ratio signal and controlling the switching state of the first output bridge arm according to the first duty ratio signal.
In one embodiment, the second duty cycle adjustment circuit includes: the acquisition unit is used for acquiring the ratio of the duty ratio of the trigger pulse of the first input bridge arm to the duty ratio of the trigger pulse of the first output bridge arm; the multiplication unit is used for carrying out multiplication processing on the first signal to be processed according to the ratio to obtain a second signal to be processed; the superposition unit is used for carrying out superposition processing on the second signal to be processed according to the ratio and a second preset threshold value to obtain a second duty ratio signal; and the control unit is used for controlling the duty ratio of the preset phase shifting angle according to the second duty ratio signal. .
The invention adjusts the duty ratio and the phase shift angle of the trigger pulse of the first output bridge arm of the soft switching bidirectional DC converter in the boost modeφCorresponding duty cycle，The output power of the circuit is adjusted, so that the purpose of adjusting the output current with the highest efficiency is achieved, and the stable and reliable operation of the system is guaranteed. Compared with the traditional method, the method has the advantages that the minimum conduction loss and turn-off loss exist when the same power is transmitted, the highest energy conversion efficiency can be obtained on the basis of realizing soft switching, the inductance value can be reduced, the size of a smaller magnetic element is realized, and the power density is improved.
Drawings
Fig. 1 is a schematic circuit diagram of a soft-switching bidirectional dc converter according to an embodiment of the present invention;
fig. 2 is a schematic flowchart of a boost-mode constant-current control method of a soft-switching bidirectional dc converter according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart illustrating a boost-mode constant-current control method for a soft-switching bidirectional DC converter according to another embodiment of the present invention;
FIG. 4 is a schematic flow chart illustrating a boost-mode constant-current control method for a soft-switching bidirectional DC converter according to another embodiment of the present invention;
FIG. 5 is a diagram of a current waveform of an inductor in a soft-switched bidirectional DC converter according to an embodiment of the present invention;
FIG. 6 is a graph of voltage ratio versus duty cycle adjustment range according to an embodiment of the present invention;
FIG. 7 is a graph of voltage ratio versus duty cycle adjustment range according to another embodiment of the present invention;
FIG. 8 is a block diagram of a boost mode constant current control circuit of a soft-switching bidirectional DC converter according to an embodiment of the present invention;
FIG. 9 is a block diagram of a boost mode constant current control circuit of a soft-switched bidirectional DC converter according to another embodiment of the present invention;
FIG. 10 is a block diagram of a boost mode constant current control circuit for a soft-switched bidirectional DC converter according to yet another embodiment of the present invention;
fig. 11 is a logic diagram of a boost mode constant current control circuit of a soft-switching bidirectional dc converter according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In one embodiment, the present invention provides a boost-mode constant current control method for a soft-switched bidirectional dc converter, which can be applied to regulate the soft-switched bidirectional dc converter 10 shown in fig. 1. Wherein, the soft-switching bidirectional dc converter 10 at least includes: the bridge circuit comprises a first input bridge arm 110, a second input bridge arm 120, a first output bridge arm 130 and a second output bridge arm 140, wherein the first input bridge arm 110 and the second input bridge arm 120 are connected to form an input half bridge, and the first output bridge arm 130 and the second output bridge arm 140 are connected to form an output half bridge. An inductor L is further connected between the input half bridge and the output half bridge, specifically, one end of the inductor L is connected to a connection node between the first input bridge arm 110 and the second input bridge arm 120, and the other end of the inductor L is connected to a connection node between the first output bridge arm 130 and the second output bridge arm 140. The input half-bridge and the output half-bridge are connected to ground, i.e., the ground of the input half-bridge is connected to the ground of the output half-bridge.
Optionally, the four bridge arms are respectively composed of at least one switching tube, and the switching tube may include, but is not limited to, at least one of a MOS tube, a field effect transistor, a triode, and the like. The switching tube of the first input bridge arm 110 and the switching tube of the second input bridge arm 120 are complementarily conducted, and the switching tube S of the first output bridge arm and the switching tube S of the second output bridge arm are complementarily conducted.
Optionally, as shown in fig. 1, the soft-switched bidirectional dc converter 10 further includes an input capacitor C1 and an output capacitor C2, wherein the input capacitor C1 is connected in parallel with the input half-bridge and the output capacitor C2 is connected in parallel with the output half-bridge.
In an embodiment, taking as an example that the first input bridge arm 110 includes a switching tube S1, the second input bridge arm 120 includes a switching tube S2, the first output bridge arm 130 includes a switching tube S3, and the second output bridge arm 140 includes a switching tube S4 in the soft-switching bidirectional dc converter 10, as shown in fig. 2, a control method applied to the soft-switching bidirectional dc converter 10 provided by the present invention may include the following steps:
and S210, when the soft-switching bidirectional direct current converter is in a boosting mode, adjusting the duty ratio of the first output bridge arm according to the difference value of the output current of the first output bridge arm and a preset current.
Wherein, when the output voltage of the soft switch bidirectional DC converterV 2 Greater than the input voltageV 1(i.e. then=V 2/V 1>1) The soft-switched bidirectional dc converter operates in a boost mode. At this time, according to the difference between the output current of the first output bridge arm 130 and the preset current, the duty ratio of the first output bridge arm 130, that is, the duty ratio of the switching tube S3 is adjusted, so that the ratio n of the duty ratio of the trigger pulse of the switching tube S1 to the duty ratio of the trigger pulse of the switching tube S3 is changed, and the output voltage is changedV 2 And an input voltageV 1Is also equal to n, thereby acting to regulate the output voltage.
Alternatively, when the power of the soft-switching bidirectional direct current converter is small, the duty ratio of the switching tube S3 can be increasedD 2 Up to the switching tubeS 3 Duty ratio ofD 2 To a predetermined maximum valueD 2maxI.e. a first preset threshold.
And S220, when the duty ratio of the first output bridge arm reaches a first preset threshold value, adjusting the duty ratio of a preset phase shift angle, wherein the preset phase shift angle is the phase shift angle of the trigger pulse of the first input bridge arm leading the trigger pulse of the first output bridge arm.
The phase shift angle of the trigger pulse of the first input bridge arm 110 before the trigger pulse of the first output bridge arm 130 is recorded as the preset phase shift angleφ. Duty ratio of switch tube S3D2To a predetermined maximum valueD2 maxWhen the duty ratio of the first output bridge arm 110 reaches the first preset threshold value, the preset phase shift angle is adjustedφDuty ratio ofD φ The output power of the circuit can be adjusted. Wherein the content of the first and second substances,D φ =φ/2π。
in this embodiment, the duty ratio of the trigger pulse of the first output bridge arm 130 is adjustedD2And the phase shift angle of the trigger pulse of first input leg 110 leading the trigger pulse of first output leg 130φCorresponding duty cycle，The output power of the circuit is adjusted, so that the purpose of adjusting the output current with the highest efficiency is achieved, and the stable and reliable operation of the system is guaranteed.
In one embodiment, the preset phase shift angle is controlled while adjusting the duty cycle of first output leg 130φThe duty cycle of (a) is maintained constant; at the adjustment of the preset phase shift angleφThe duty ratio of first output arm 130 is controlled to be maintained. In this embodiment, when the circuit power is small, the phase shift angle is fixed and presetφDuty ratio ofD φ Changing the duty cycle of first output leg 130D 2To regulate the power when the duty cycle of first output leg 130D 2Reaches a preset maximum valueD 2maxThen, fixD 2By changing only the preset phase-shifting angleφDuty ratio ofD φ To regulate the power. By adjusting a predetermined phase shift angleφCorresponding duty cycleD φ The direction of the circuit energy flow can be adjusted; when in useD φ When the voltage is greater than 0, the energy is transmitted from the input end to the output end, and when the voltage is greater than 0D φ When less than 0, energy is outputThe terminal is passed to the input terminal. Therefore, the power of the circuit can be controlled, and the energy flow direction of the circuit can be controlled, so that the purpose of adjusting the output current with the highest efficiency is achieved, and the stable and reliable operation of the system is further ensured.
The invention provides a soft-switching bidirectional direct-current converter boost mode constant-voltage control method based on optimal efficiency, which has the smallest conduction loss and turn-off loss when the same power is transmitted, can obtain the highest energy conversion efficiency on the basis of realizing soft switching, can also reduce inductance value, realizes the volume of a smaller magnetic element, and improves power density.
In an embodiment, as shown in fig. 3, the step S210 specifically includes the following steps:
s211, sampling the output current of the first output bridge arm, and calculating the difference value between the output current of the first output bridge arm and the preset current.
S212, proportional integral adjustment processing is carried out on the difference value, and a first signal to be processed is obtained.
Wherein the predetermined current is assumed to be a given current I2 *The output current of the first output bridge arm is the output current of the soft-switching bidirectional DC converterI 2. As shown in fig. 11, can beI 2 And I 2 *The differential input voltage is used as a differential input voltage of a proportional-integral regulator, and the proportional-integral regulator is used for carrying out proportional-integral regulation processing on the differential input voltage to obtain a first signal to be processedD 2 *。
And S213, carrying out amplitude limiting processing on the first signal to be processed to obtain a first duty ratio signal.
The amplitude limiting processing is used for limiting the upper limit of the first duty ratio signal not to exceed a first preset threshold value. Specifically, as shown in fig. 11, the first signal to be processed is processed by the clipping processD 2 *Is limited to a first preset thresholdD 2maxMaking the output first duty ratio signal not larger than a first preset threshold valueD 2max。
And S214, controlling the switching state of the first output bridge arm according to the first duty ratio signal.
The first duty cycle signal is taken as the duty cycle of first output leg 130D 2Thereby controlling the switching state of first output leg 130 according to the first duty cycle signal.
In an embodiment, as shown in fig. 4, the step S220 specifically includes the following steps:
s221, acquiring a ratio of the duty ratio of the trigger pulse of the first input bridge arm to the duty ratio of the trigger pulse of the first output bridge arm.
Wherein, the ratio of the duty ratio of the trigger pulse of the first input bridge arm 110 to the duty ratio of the trigger pulse of the first output bridge arm 130 is recorded asnThen, thenn=V 2 /V 1 ，V 2 Is the output voltage of first output leg 130,V 1 is the input voltage of first input leg 110.
And S222, multiplying the first signal to be processed according to the ratio to obtain a second signal to be processed.
Specifically, the first signal to be processed is multiplied by a difference between the ratio and a preset value to obtain a second signal to be processed. Optionally, the preset value is 1. I.e. second signal to be processed = first signal to be processed (b)n-1) *D 2 *。
And S223, performing superposition processing on the second signal to be processed according to the ratio and a second preset threshold value to obtain a second duty ratio signal.
Specifically, the quotient of the second preset threshold value and the ratio is used as a superposition value, and the superposition value is superposed in the second signal to be processed to obtain a second duty ratio signal. For example, the inductance between the input half-bridge and the output half-bridge of the soft-switching bidirectional DC converter 10LCurrent ofI 0With a time constant ofT p Then the second preset threshold is 2I 0 L/V 1 T p A superposition value of 2I 0 L/nV 1 T p After the superposition, the second duty ratio signal isD φ =(n-1)D 2 *+2I 0 L/nV 1 T p 。
And S223, controlling the duty ratio of the preset phase shifting angle according to the second duty ratio signal.
Using the second duty ratio signal as a preset phase shift angleφDuty ratio ofD φ Thereby realizing that the power of the circuit is adjusted according to the second duty ratio signal.
In one embodiment, the method further includes adjusting the duty ratio of the first input bridge arm according to the first duty ratio signal and a preset ratio, where the preset ratio is a ratio between the duty ratio of the trigger pulse of the first input bridge arm and the duty ratio of the trigger pulse of the first output bridge arm.
In this embodiment, the ratio of the duty ratio of the trigger pulse of the first input bridge arm 110 to the duty ratio of the trigger pulse of the first output bridge arm 130 is equal ton,Then adjustnEqual to a predetermined voltageV 2 *And sampling the resulting input voltageV 1Quotient of (d), the duty cycle of first output leg 130D 2 Andnafter multiplication, a third duty ratio signal is outputD 1As the duty cycle of first input leg 110.
In one embodiment, the input current of the soft-switching bidirectional DC converter 10 is recorded asI 1The output end current isI 2The current of the inductor L isI 0Then the inductor currentI 0And duty ratioD φ And duty cycleD 2 The relationship of (2) is shown in FIG. 5. Inductive current for soft switching bidirectional DC converter capable of switching on at zero voltageI 0Is less than 0, so that the fluctuation of the inductive current is larger than that of the traditional hard switch circuit, and the inductive value is increasedLCan be reduced by a multiple. In this case, since a small inductance is used, the circuit loss is low, the cost is low, and a high switching frequency and a high power density can be realized. For example, FIG. 6 illustrates an embodiment of the present inventionIn the embodiment, when the voltage transformation ratio n =1.05 of the soft-switching bidirectional direct-current converter, the duty ratioD 2 AndD φ and three equal power lines of 250W, 500W and 1000W. Wherein the parameters are takenL=150nH，I 0 =15.7A，T p =1μs，V 1 =35V，V 2 =52.5V，n=1.5, full load powerP max =1000W。
For another example, fig. 7 shows the duty ratio when the voltage transformation ratio n =1.5 of the soft-switching bidirectional dc converter in an embodiment of the inventionD 2 AndD φ and three equal power lines of 250W, 500W and 1000W. Wherein the parameters are takenL=150nH，I 0 =15.7A，T p =1μs，V 1 =50V，V 2 =52.5V，n=1.05, full load powerP max =1000W。
In another aspect of the present invention, a boost-mode constant current control circuit of a soft-switching bidirectional dc converter is provided, as shown in fig. 8, the boost-mode constant current control circuit 80 of the soft-switching bidirectional dc converter includes:
and the first duty ratio adjusting circuit 810 is used for connecting a first output bridge arm of the soft-switching bidirectional direct-current converter and adjusting the duty ratio of the first output bridge arm according to the difference value between the output current of the first output bridge arm and the preset current when the soft-switching bidirectional direct-current converter is in the boost mode.
And a second duty ratio adjusting circuit 820, configured to connect the first output bridge arm and the first input bridge arm of the soft-switching bidirectional dc converter, and adjust a duty ratio of a preset phase shift angle when the duty ratio of the first output bridge arm reaches a first preset threshold, where the preset phase shift angle is a phase shift angle at which a trigger pulse of the first input bridge arm leads a trigger pulse of the first output bridge arm.
In one embodiment, as shown in fig. 9, the first duty cycle adjusting circuit 810 includes:
the proportional-integral regulator 811 is connected with the first output bridge arm and is used for sampling the output current of the first output bridge arm, taking the output current of the first output bridge arm and a preset current as a differential input signal, and performing proportional-integral regulation processing on the differential input signal to obtain a first signal to be processed;
and the amplitude limiting circuit 812 is connected with the proportional-integral regulator and the first output bridge arm, and is configured to perform amplitude limiting processing on the first signal to be processed to obtain a first duty ratio signal, and control a switching state of the first output bridge arm according to the first duty ratio signal.
In one embodiment, as shown in fig. 10, the second duty cycle adjusting circuit 820 includes:
an obtaining unit 821 is configured to obtain a ratio between a duty ratio of the trigger pulse of the first input bridge arm and a duty ratio of the trigger pulse of the first output bridge arm.
A multiplication unit 822, configured to perform multiplication processing on the first signal to be processed according to the ratio, so as to obtain a second signal to be processed.
A superposition unit 823, configured to perform superposition processing on the second signal to be processed according to the ratio and a second preset threshold to obtain a second duty ratio signal;
a control unit 824, configured to control the duty cycle of the preset phase shift angle according to the second duty cycle signal.
In one embodiment, a boost-mode constant-current control circuit of a soft-switching bidirectional dc converter is provided, which is used to implement the boost-mode constant-current control method of the soft-switching bidirectional dc converter in any of the above embodiments.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A boost mode constant current control method for a soft-switching bidirectional DC converter, the soft-switching bidirectional DC converter comprising: the bridge comprises a first input bridge arm, a second input bridge arm, a first output bridge arm and a second output bridge arm; the method comprises the following steps:
when the soft switching bidirectional direct current converter is in a boosting mode, adjusting the duty ratio of the first output bridge arm according to the difference value of the output current of the first output bridge arm and a preset current;
and when the duty ratio of the first output bridge arm reaches a first preset threshold value, adjusting the duty ratio of a preset phase shift angle, wherein the preset phase shift angle is the phase shift angle of the trigger pulse of the first input bridge arm leading the trigger pulse of the first output bridge arm.
2. The method of claim 1, further comprising:
controlling the duty ratio of the preset phase shifting angle to be kept unchanged when the duty ratio of the first output bridge arm is adjusted;
and controlling the duty ratio of the first output bridge arm to be kept unchanged when the duty ratio of the preset phase shifting angle is adjusted.
3. The method of claim 1, wherein the adjusting the duty cycle of the first output leg according to the difference between the output current of the first output leg and a preset current comprises:
sampling the output current of the first output bridge arm, and calculating the difference value between the output current of the first output bridge arm and the preset current;
carrying out proportional integral adjustment processing on the difference value to obtain a first signal to be processed;
carrying out amplitude limiting processing on the first signal to be processed to obtain a first duty ratio signal;
and controlling the switching state of the first output bridge arm according to the first duty ratio signal.
4. The method of claim 3, wherein the clipping process is used to limit an upper limit of the first duty cycle signal not to exceed the first preset threshold.
5. The method of claim 3, wherein said adjusting the duty cycle of the preset phase shift angle comprises:
acquiring the ratio of the duty ratio of the trigger pulse of the first input bridge arm to the duty ratio of the trigger pulse of the first output bridge arm;
multiplying the first signal to be processed according to the ratio to obtain a second signal to be processed;
performing superposition processing on the second signal to be processed according to the ratio and a second preset threshold value to obtain a second duty ratio signal;
and controlling the duty ratio of the preset phase shifting angle according to the second duty ratio signal.
6. The method according to claim 5, wherein the multiplying the first signal to be processed according to the ratio is specifically: and multiplying the first signal to be processed by the difference value between the ratio and a preset value to obtain a second signal to be processed.
7. The method of claim 5, further comprising adjusting the duty cycle of the first input leg according to the first duty cycle signal and the ratio, wherein the preset ratio is a ratio between the duty cycle of the trigger pulses of the first input leg and the duty cycle of the trigger pulses of the first output leg.
8. A boost-mode constant current control circuit for a soft-switching bidirectional DC converter, comprising:
the first duty ratio regulating circuit is used for connecting a first output bridge arm of the soft-switching bidirectional direct-current converter and regulating the duty ratio of the first output bridge arm according to the difference value of the output current of the first output bridge arm and the preset current when the soft-switching bidirectional direct-current converter is in a boosting mode;
and the second duty ratio regulating circuit is used for connecting a first output bridge arm and a first input bridge arm of the soft-switching bidirectional direct-current converter, and regulating the duty ratio of a preset phase shift angle when the duty ratio of the first output bridge arm reaches a first preset threshold value, wherein the preset phase shift angle is the phase shift angle of the trigger pulse of the first input bridge arm leading the trigger pulse of the first output bridge arm.
9. The circuit of claim 8, wherein the first duty cycle adjustment circuit comprises:
the proportional-integral regulator is connected with the first output bridge arm and is used for sampling the output current of the first output bridge arm, taking the output current of the first output bridge arm and a preset current as a differential input signal, and performing proportional-integral regulation processing on the differential input signal to obtain a first signal to be processed;
and the amplitude limiting circuit is connected with the proportional-integral regulator and the first output bridge arm and is used for carrying out amplitude limiting processing on the first signal to be processed to obtain a first duty ratio signal and controlling the switching state of the first output bridge arm according to the first duty ratio signal.
10. The circuit of claim 9, wherein the second duty cycle adjustment circuit comprises:
the acquisition unit is used for acquiring the ratio of the duty ratio of the trigger pulse of the first input bridge arm to the duty ratio of the trigger pulse of the first output bridge arm;
the multiplication unit is used for carrying out multiplication processing on the first signal to be processed according to the ratio to obtain a second signal to be processed;
the superposition unit is used for carrying out superposition processing on the second signal to be processed according to the ratio and a second preset threshold value to obtain a second duty ratio signal;
and the control unit is used for controlling the duty ratio of the preset phase shifting angle according to the second duty ratio signal.
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| CN114764259A (en) * | 2021-01-11 | 2022-07-19 | 台达电子企业管理（上海）有限公司 | Current control device and power conversion system using the same |
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